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Driver core changes for 6.1-rc1

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Here is the big set of driver core and debug printk changes for 6.1-rc1.
 Included in here is:
 	- dynamic debug updates for the core and the drm subsystem.  The
 	  drm changes have all been acked by the relevant maintainers.
 	- kernfs fixes for syzbot reported problems
 	- kernfs refactors and updates for cgroup requirements
 	- magic number cleanups and removals from the kernel tree (they
 	  were not being used and they really did not actually do
 	  anything.)
 	- other tiny cleanups
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the big set of driver core and debug printk changes for
  6.1-rc1. Included in here is:

   - dynamic debug updates for the core and the drm subsystem. The drm
     changes have all been acked by the relevant maintainers

   - kernfs fixes for syzbot reported problems

   - kernfs refactors and updates for cgroup requirements

   - magic number cleanups and removals from the kernel tree (they were
     not being used and they really did not actually do anything)

   - other tiny cleanups

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (74 commits)
  docs: filesystems: sysfs: Make text and code for ->show() consistent
  Documentation: NBD_REQUEST_MAGIC isn't a magic number
  a.out: restore CMAGIC
  device property: Add const qualifier to device_get_match_data() parameter
  drm_print: add _ddebug descriptor to drm_*dbg prototypes
  drm_print: prefer bare printk KERN_DEBUG on generic fn
  drm_print: optimize drm_debug_enabled for jump-label
  drm-print: add drm_dbg_driver to improve namespace symmetry
  drm-print.h: include dyndbg header
  drm_print: wrap drm_*_dbg in dyndbg descriptor factory macro
  drm_print: interpose drm_*dbg with forwarding macros
  drm: POC drm on dyndbg - use in core, 2 helpers, 3 drivers.
  drm_print: condense enum drm_debug_category
  debugfs: use DEFINE_SHOW_ATTRIBUTE to define debugfs_regset32_fops
  driver core: use IS_ERR_OR_NULL() helper in device_create_groups_vargs()
  Documentation: ENI155_MAGIC isn't a magic number
  Documentation: NBD_REPLY_MAGIC isn't a magic number
  nbd: remove define-only NBD_MAGIC, previously magic number
  Documentation: FW_HEADER_MAGIC isn't a magic number
  Documentation: EEPROM_MAGIC_VALUE isn't a magic number
  ...
This commit is contained in:
Linus Torvalds 2022-10-07 17:04:10 -07:00
commit e8bc52cb8d
46 changed files with 1320 additions and 696 deletions

246
Documentation/admin-guide/dynamic-debug-howto.rst
View File

@ -5,143 +5,115 @@ Dynamic debug
Introduction
============
This document describes how to use the dynamic debug (dyndbg) feature.
Dynamic debug allows you to dynamically enable/disable kernel
debug-print code to obtain additional kernel information.
Dynamic debug is designed to allow you to dynamically enable/disable
kernel code to obtain additional kernel information. Currently, if
``CONFIG_DYNAMIC_DEBUG`` is set, then all ``pr_debug()``/``dev_dbg()`` and
``print_hex_dump_debug()``/``print_hex_dump_bytes()`` calls can be dynamically
enabled per-callsite.
If ``/proc/dynamic_debug/control`` exists, your kernel has dynamic
debug. You'll need root access (sudo su) to use this.
If you do not want to enable dynamic debug globally (i.e. in some embedded
system), you may set ``CONFIG_DYNAMIC_DEBUG_CORE`` as basic support of dynamic
debug and add ``ccflags := -DDYNAMIC_DEBUG_MODULE`` into the Makefile of any
modules which you'd like to dynamically debug later.
Dynamic debug provides:
If ``CONFIG_DYNAMIC_DEBUG`` is not set, ``print_hex_dump_debug()`` is just
shortcut for ``print_hex_dump(KERN_DEBUG)``.
* a Catalog of all *prdbgs* in your kernel.
``cat /proc/dynamic_debug/control`` to see them.
For ``print_hex_dump_debug()``/``print_hex_dump_bytes()``, format string is
its ``prefix_str`` argument, if it is constant string; or ``hexdump``
in case ``prefix_str`` is built dynamically.
Dynamic debug has even more useful features:
* Simple query language allows turning on and off debugging
statements by matching any combination of 0 or 1 of:
* a Simple query/command language to alter *prdbgs* by selecting on
any combination of 0 or 1 of:
- source filename
- function name
- line number (including ranges of line numbers)
- module name
- format string
* Provides a debugfs control file: ``<debugfs>/dynamic_debug/control``
which can be read to display the complete list of known debug
statements, to help guide you
Controlling dynamic debug Behaviour
===================================
The behaviour of ``pr_debug()``/``dev_dbg()`` are controlled via writing to a
control file in the 'debugfs' filesystem. Thus, you must first mount
the debugfs filesystem, in order to make use of this feature.
Subsequently, we refer to the control file as:
``<debugfs>/dynamic_debug/control``. For example, if you want to enable
printing from source file ``svcsock.c``, line 1603 you simply do::
nullarbor:~ # echo 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
If you make a mistake with the syntax, the write will fail thus::
nullarbor:~ # echo 'file svcsock.c wtf 1 +p' >
<debugfs>/dynamic_debug/control
-bash: echo: write error: Invalid argument
Note, for systems without 'debugfs' enabled, the control file can be
found in ``/proc/dynamic_debug/control``.
- class name (as known/declared by each module)
Viewing Dynamic Debug Behaviour
===============================
You can view the currently configured behaviour of all the debug
statements via::
You can view the currently configured behaviour in the *prdbg* catalog::
nullarbor:~ # cat <debugfs>/dynamic_debug/control
:#> head -n7 /proc/dynamic_debug/control
# filename:lineno [module]function flags format
net/sunrpc/svc_rdma.c:323 [svcxprt_rdma]svc_rdma_cleanup =_ "SVCRDMA Module Removed, deregister RPC RDMA transport\012"
net/sunrpc/svc_rdma.c:341 [svcxprt_rdma]svc_rdma_init =_ "\011max_inline : %d\012"
net/sunrpc/svc_rdma.c:340 [svcxprt_rdma]svc_rdma_init =_ "\011sq_depth : %d\012"
net/sunrpc/svc_rdma.c:338 [svcxprt_rdma]svc_rdma_init =_ "\011max_requests : %d\012"
...
init/main.c:1179 [main]initcall_blacklist =_ "blacklisting initcall %s\012
init/main.c:1218 [main]initcall_blacklisted =_ "initcall %s blacklisted\012"
init/main.c:1424 [main]run_init_process =_ " with arguments:\012"
init/main.c:1426 [main]run_init_process =_ " %s\012"
init/main.c:1427 [main]run_init_process =_ " with environment:\012"
init/main.c:1429 [main]run_init_process =_ " %s\012"
The 3rd space-delimited column shows the current flags, preceded by
a ``=`` for easy use with grep/cut. ``=p`` shows enabled callsites.
You can also apply standard Unix text manipulation filters to this
data, e.g.::
Controlling dynamic debug Behaviour
===================================
nullarbor:~ # grep -i rdma <debugfs>/dynamic_debug/control | wc -l
62
The behaviour of *prdbg* sites are controlled by writing
query/commands to the control file. Example::
nullarbor:~ # grep -i tcp <debugfs>/dynamic_debug/control | wc -l
42
# grease the interface
:#> alias ddcmd='echo $* > /proc/dynamic_debug/control'
The third column shows the currently enabled flags for each debug
statement callsite (see below for definitions of the flags). The
default value, with no flags enabled, is ``=_``. So you can view all
the debug statement callsites with any non-default flags::
:#> ddcmd '-p; module main func run* +p'
:#> grep =p /proc/dynamic_debug/control
init/main.c:1424 [main]run_init_process =p " with arguments:\012"
init/main.c:1426 [main]run_init_process =p " %s\012"
init/main.c:1427 [main]run_init_process =p " with environment:\012"
init/main.c:1429 [main]run_init_process =p " %s\012"
nullarbor:~ # awk '$3 != "=_"' <debugfs>/dynamic_debug/control
# filename:lineno [module]function flags format
net/sunrpc/svcsock.c:1603 [sunrpc]svc_send p "svc_process: st_sendto returned %d\012"
Error messages go to console/syslog::
:#> ddcmd mode foo +p
dyndbg: unknown keyword "mode"
dyndbg: query parse failed
bash: echo: write error: Invalid argument
If debugfs is also enabled and mounted, ``dynamic_debug/control`` is
also under the mount-dir, typically ``/sys/kernel/debug/``.
Command Language Reference
==========================
At the lexical level, a command comprises a sequence of words separated
At the basic lexical level, a command is a sequence of words separated
by spaces or tabs. So these are all equivalent::
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
nullarbor:~ # echo -n ' file svcsock.c line 1603 +p ' >
<debugfs>/dynamic_debug/control
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
:#> ddcmd file svcsock.c line 1603 +p
:#> ddcmd "file svcsock.c line 1603 +p"
:#> ddcmd ' file svcsock.c line 1603 +p '
Command submissions are bounded by a write() system call.
Multiple commands can be written together, separated by ``;`` or ``\n``::
~# echo "func pnpacpi_get_resources +p; func pnp_assign_mem +p" \
> <debugfs>/dynamic_debug/control
:#> ddcmd "func pnpacpi_get_resources +p; func pnp_assign_mem +p"
:#> ddcmd <<"EOC"
func pnpacpi_get_resources +p
func pnp_assign_mem +p
EOC
:#> cat query-batch-file > /proc/dynamic_debug/control
If your query set is big, you can batch them too::
You can also use wildcards in each query term. The match rule supports
``*`` (matches zero or more characters) and ``?`` (matches exactly one
character). For example, you can match all usb drivers::
~# cat query-batch-file > <debugfs>/dynamic_debug/control
:#> ddcmd file "drivers/usb/*" +p # "" to suppress shell expansion
Another way is to use wildcards. The match rule supports ``*`` (matches
zero or more characters) and ``?`` (matches exactly one character). For
example, you can match all usb drivers::
~# echo "file drivers/usb/* +p" > <debugfs>/dynamic_debug/control
At the syntactical level, a command comprises a sequence of match
specifications, followed by a flags change specification::
Syntactically, a command is pairs of keyword values, followed by a
flags change or setting::
command ::= match-spec* flags-spec
The match-spec's are used to choose a subset of the known pr_debug()
callsites to which to apply the flags-spec. Think of them as a query
with implicit ANDs between each pair. Note that an empty list of
match-specs will select all debug statement callsites.
The match-spec's select *prdbgs* from the catalog, upon which to apply
the flags-spec, all constraints are ANDed together. An absent keyword
is the same as keyword "*".
A match specification comprises a keyword, which controls the
attribute of the callsite to be compared, and a value to compare
against. Possible keywords are:::
A match specification is a keyword, which selects the attribute of
the callsite to be compared, and a value to compare against. Possible
keywords are:::
match-spec ::= 'func' string |
'file' string |
'module' string |
'format' string |
'class' string |
'line' line-range
line-range ::= lineno |
@ -203,6 +175,16 @@ format
format "nfsd: SETATTR" // a neater way to match a format with whitespace
format 'nfsd: SETATTR' // yet another way to match a format with whitespace
class
The given class_name is validated against each module, which may
have declared a list of known class_names. If the class_name is
found for a module, callsite & class matching and adjustment
proceeds. Examples::
class DRM_UT_KMS # a DRM.debug category
class JUNK # silent non-match
// class TLD_* # NOTICE: no wildcard in class names
line
The given line number or range of line numbers is compared
against the line number of each ``pr_debug()`` callsite. A single
@ -228,17 +210,16 @@ of the characters::
The flags are::
p enables the pr_debug() callsite.
f Include the function name in the printed message
l Include line number in the printed message
m Include module name in the printed message
t Include thread ID in messages not generated from interrupt context
_ No flags are set. (Or'd with others on input)
_ enables no flags.
For ``print_hex_dump_debug()`` and ``print_hex_dump_bytes()``, only ``p`` flag
have meaning, other flags ignored.
Decorator flags add to the message-prefix, in order:
t Include thread ID, or <intr>
m Include module name
f Include the function name
l Include line number
For display, the flags are preceded by ``=``
(mnemonic: what the flags are currently equal to).
For ``print_hex_dump_debug()`` and ``print_hex_dump_bytes()``, only
the ``p`` flag has meaning, other flags are ignored.
Note the regexp ``^[-+=][flmpt_]+$`` matches a flags specification.
To clear all flags at once, use ``=_`` or ``-flmpt``.
@ -313,7 +294,7 @@ For ``CONFIG_DYNAMIC_DEBUG`` kernels, any settings given at boot-time (or
enabled by ``-DDEBUG`` flag during compilation) can be disabled later via
the debugfs interface if the debug messages are no longer needed::
echo "module module_name -p" > <debugfs>/dynamic_debug/control
echo "module module_name -p" > /proc/dynamic_debug/control
Examples
========
@ -321,37 +302,31 @@ Examples
::
// enable the message at line 1603 of file svcsock.c
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
<debugfs>/dynamic_debug/control
:#> ddcmd 'file svcsock.c line 1603 +p'
// enable all the messages in file svcsock.c
nullarbor:~ # echo -n 'file svcsock.c +p' >
<debugfs>/dynamic_debug/control
:#> ddcmd 'file svcsock.c +p'
// enable all the messages in the NFS server module
nullarbor:~ # echo -n 'module nfsd +p' >
<debugfs>/dynamic_debug/control
:#> ddcmd 'module nfsd +p'
// enable all 12 messages in the function svc_process()
nullarbor:~ # echo -n 'func svc_process +p' >
<debugfs>/dynamic_debug/control
:#> ddcmd 'func svc_process +p'
// disable all 12 messages in the function svc_process()
nullarbor:~ # echo -n 'func svc_process -p' >
<debugfs>/dynamic_debug/control
:#> ddcmd 'func svc_process -p'
// enable messages for NFS calls READ, READLINK, READDIR and READDIR+.
nullarbor:~ # echo -n 'format "nfsd: READ" +p' >
<debugfs>/dynamic_debug/control
:#> ddcmd 'format "nfsd: READ" +p'
// enable messages in files of which the paths include string "usb"
nullarbor:~ # echo -n 'file *usb* +p' > <debugfs>/dynamic_debug/control
:#> ddcmd 'file *usb* +p' > /proc/dynamic_debug/control
// enable all messages
nullarbor:~ # echo -n '+p' > <debugfs>/dynamic_debug/control
:#> ddcmd '+p' > /proc/dynamic_debug/control
// add module, function to all enabled messages
nullarbor:~ # echo -n '+mf' > <debugfs>/dynamic_debug/control
:#> ddcmd '+mf' > /proc/dynamic_debug/control
// boot-args example, with newlines and comments for readability
Kernel command line: ...
@ -364,3 +339,38 @@ Examples
dyndbg="file init/* +p #cmt ; func parse_one +p"
// enable pr_debugs in 2 functions in a module loaded later
pc87360.dyndbg="func pc87360_init_device +p; func pc87360_find +p"
Kernel Configuration
====================
Dynamic Debug is enabled via kernel config items::
CONFIG_DYNAMIC_DEBUG=y # build catalog, enables CORE
CONFIG_DYNAMIC_DEBUG_CORE=y # enable mechanics only, skip catalog
If you do not want to enable dynamic debug globally (i.e. in some embedded
system), you may set ``CONFIG_DYNAMIC_DEBUG_CORE`` as basic support of dynamic
debug and add ``ccflags := -DDYNAMIC_DEBUG_MODULE`` into the Makefile of any
modules which you'd like to dynamically debug later.
Kernel *prdbg* API
==================
The following functions are cataloged and controllable when dynamic
debug is enabled::
pr_debug()
dev_dbg()
print_hex_dump_debug()
print_hex_dump_bytes()
Otherwise, they are off by default; ``ccflags += -DDEBUG`` or
``#define DEBUG`` in a source file will enable them appropriately.
If ``CONFIG_DYNAMIC_DEBUG`` is not set, ``print_hex_dump_debug()`` is
just a shortcut for ``print_hex_dump(KERN_DEBUG)``.
For ``print_hex_dump_debug()``/``print_hex_dump_bytes()``, format string is
its ``prefix_str`` argument, if it is constant string; or ``hexdump``
in case ``prefix_str`` is built dynamically.

1
Documentation/driver-api/driver-model/devres.rst
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@ -311,7 +311,6 @@ IOMAP
devm_ioremap()
devm_ioremap_uc()
devm_ioremap_wc()
devm_ioremap_np()
devm_ioremap_resource() : checks resource, requests memory region, ioremaps
devm_ioremap_resource_wc()
devm_platform_ioremap_resource() : calls devm_ioremap_resource() for platform device

2
Documentation/filesystems/sysfs.rst
View File

@ -263,7 +263,7 @@ A very simple (and naive) implementation of a device attribute is::
static ssize_t show_name(struct device *dev, struct device_attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%s\n", dev->name);
return sysfs_emit(buf, "%s\n", dev->name);
}
static ssize_t store_name(struct device *dev, struct device_attribute *attr,

65
Documentation/process/magic-number.rst
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@ -69,82 +69,17 @@ Changelog::
Magic Name Number Structure File
===================== ================ ======================== ==========================================
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``
FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h``
FF_MAGIC 0x4646 fc_info ``drivers/net/iph5526_novram.c``
PTY_MAGIC 0x5001 ``drivers/char/pty.c``
PPP_MAGIC 0x5002 ppp ``include/linux/if_pppvar.h``
SSTATE_MAGIC 0x5302 serial_state ``include/linux/serial.h``
SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h``
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
USB_SERIAL_MAGIC 0x6702 usb_serial ``drivers/usb/serial/usb-serial.h``
FULL_DUPLEX_MAGIC 0x6969 ``drivers/net/ethernet/dec/tulip/de2104x.c``
USB_BLUETOOTH_MAGIC 0x6d02 usb_bluetooth ``drivers/usb/class/bluetty.c``
RFCOMM_TTY_MAGIC 0x6d02 ``net/bluetooth/rfcomm/tty.c``
USB_SERIAL_PORT_MAGIC 0x7301 usb_serial_port ``drivers/usb/serial/usb-serial.h``
CG_MAGIC 0x00090255 ufs_cylinder_group ``include/linux/ufs_fs.h``
LSEMAGIC 0x05091998 lse ``drivers/fc4/fc.c``
RIEBL_MAGIC 0x09051990 ``drivers/net/atarilance.c``
NBD_REQUEST_MAGIC 0x12560953 nbd_request ``include/linux/nbd.h``
RED_MAGIC2 0x170fc2a5 (any) ``mm/slab.c``
BAYCOM_MAGIC 0x19730510 baycom_state ``drivers/net/baycom_epp.c``
ISDN_X25IFACE_MAGIC 0x1e75a2b9 isdn_x25iface_proto_data ``drivers/isdn/isdn_x25iface.h``
ECP_MAGIC 0x21504345 cdkecpsig ``include/linux/cdk.h``
LSOMAGIC 0x27091997 lso ``drivers/fc4/fc.c``
LSMAGIC 0x2a3b4d2a ls ``drivers/fc4/fc.c``
WANPIPE_MAGIC 0x414C4453 sdla_{dump,exec} ``include/linux/wanpipe.h``
CS_CARD_MAGIC 0x43525553 cs_card ``sound/oss/cs46xx.c``
LABELCL_MAGIC 0x4857434c labelcl_info_s ``include/asm/ia64/sn/labelcl.h``
ISDN_ASYNC_MAGIC 0x49344C01 modem_info ``include/linux/isdn.h``
CTC_ASYNC_MAGIC 0x49344C01 ctc_tty_info ``drivers/s390/net/ctctty.c``
ISDN_NET_MAGIC 0x49344C02 isdn_net_local_s ``drivers/isdn/i4l/isdn_net_lib.h``
SAVEKMSG_MAGIC2 0x4B4D5347 savekmsg ``arch/*/amiga/config.c``
CS_STATE_MAGIC 0x4c4f4749 cs_state ``sound/oss/cs46xx.c``
SLAB_C_MAGIC 0x4f17a36d kmem_cache ``mm/slab.c``
COW_MAGIC 0x4f4f4f4d cow_header_v1 ``arch/um/drivers/ubd_user.c``
I810_CARD_MAGIC 0x5072696E i810_card ``sound/oss/i810_audio.c``
TRIDENT_CARD_MAGIC 0x5072696E trident_card ``sound/oss/trident.c``
ROUTER_MAGIC 0x524d4157 wan_device [in ``wanrouter.h`` pre 3.9]
SAVEKMSG_MAGIC1 0x53415645 savekmsg ``arch/*/amiga/config.c``
GDA_MAGIC 0x58464552 gda ``arch/mips/include/asm/sn/gda.h``
RED_MAGIC1 0x5a2cf071 (any) ``mm/slab.c``
EEPROM_MAGIC_VALUE 0x5ab478d2 lanai_dev ``drivers/atm/lanai.c``
HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state ``include/linux/hdlcdrv.h``
PCXX_MAGIC 0x5c6df104 channel ``drivers/char/pcxx.h``
KV_MAGIC 0x5f4b565f kernel_vars_s ``arch/mips/include/asm/sn/klkernvars.h``
I810_STATE_MAGIC 0x63657373 i810_state ``sound/oss/i810_audio.c``
TRIDENT_STATE_MAGIC 0x63657373 trient_state ``sound/oss/trident.c``
M3_CARD_MAGIC 0x646e6f50 m3_card ``sound/oss/maestro3.c``
FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fore200e.h``
SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h``
SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h``
LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h``
M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c``
VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c``
KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c``
PWC_MAGIC 0x89DC10AB pwc_device ``drivers/usb/media/pwc.h``
NBD_REPLY_MAGIC 0x96744668 nbd_reply ``include/linux/nbd.h``
ENI155_MAGIC 0xa54b872d midway_eprom ``drivers/atm/eni.h``
CODA_MAGIC 0xC0DAC0DA coda_file_info ``fs/coda/coda_fs_i.h``
YAM_MAGIC 0xF10A7654 yam_port ``drivers/net/hamradio/yam.c``
CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c``
QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry ``drivers/scsi/arm/queue.c``
QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry ``drivers/scsi/arm/queue.c``
HTB_CMAGIC 0xFEFAFEF1 htb_class ``net/sched/sch_htb.c``
NMI_MAGIC 0x48414d4d455201 nmi_s ``arch/mips/include/asm/sn/nmi.h``
===================== ================ ======================== ==========================================
Note that there are also defined special per-driver magic numbers in sound
memory management. See ``include/sound/sndmagic.h`` for complete list of them. Many
OSS sound drivers have their magic numbers constructed from the soundcard PCI
ID - these are not listed here as well.
HFS is another larger user of magic numbers - you can find them in
``fs/hfs/hfs.h``.

66
Documentation/translations/it_IT/process/magic-number.rst
View File

@ -75,83 +75,17 @@ Registro dei cambiamenti::
Nome magico Numero Struttura File
===================== ================ ======================== ==========================================
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``
FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h``
FF_MAGIC 0x4646 fc_info ``drivers/net/iph5526_novram.c``
PTY_MAGIC 0x5001 ``drivers/char/pty.c``
PPP_MAGIC 0x5002 ppp ``include/linux/if_pppvar.h``
SSTATE_MAGIC 0x5302 serial_state ``include/linux/serial.h``
SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h``
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
USB_SERIAL_MAGIC 0x6702 usb_serial ``drivers/usb/serial/usb-serial.h``
FULL_DUPLEX_MAGIC 0x6969 ``drivers/net/ethernet/dec/tulip/de2104x.c``
USB_BLUETOOTH_MAGIC 0x6d02 usb_bluetooth ``drivers/usb/class/bluetty.c``
RFCOMM_TTY_MAGIC 0x6d02 ``net/bluetooth/rfcomm/tty.c``
USB_SERIAL_PORT_MAGIC 0x7301 usb_serial_port ``drivers/usb/serial/usb-serial.h``
CG_MAGIC 0x00090255 ufs_cylinder_group ``include/linux/ufs_fs.h``
LSEMAGIC 0x05091998 lse ``drivers/fc4/fc.c``
RIEBL_MAGIC 0x09051990 ``drivers/net/atarilance.c``
NBD_REQUEST_MAGIC 0x12560953 nbd_request ``include/linux/nbd.h``
RED_MAGIC2 0x170fc2a5 (any) ``mm/slab.c``
BAYCOM_MAGIC 0x19730510 baycom_state ``drivers/net/baycom_epp.c``
ISDN_X25IFACE_MAGIC 0x1e75a2b9 isdn_x25iface_proto_data ``drivers/isdn/isdn_x25iface.h``
ECP_MAGIC 0x21504345 cdkecpsig ``include/linux/cdk.h``
LSOMAGIC 0x27091997 lso ``drivers/fc4/fc.c``
LSMAGIC 0x2a3b4d2a ls ``drivers/fc4/fc.c``
WANPIPE_MAGIC 0x414C4453 sdla_{dump,exec} ``include/linux/wanpipe.h``
CS_CARD_MAGIC 0x43525553 cs_card ``sound/oss/cs46xx.c``
LABELCL_MAGIC 0x4857434c labelcl_info_s ``include/asm/ia64/sn/labelcl.h``
ISDN_ASYNC_MAGIC 0x49344C01 modem_info ``include/linux/isdn.h``
CTC_ASYNC_MAGIC 0x49344C01 ctc_tty_info ``drivers/s390/net/ctctty.c``
ISDN_NET_MAGIC 0x49344C02 isdn_net_local_s ``drivers/isdn/i4l/isdn_net_lib.h``
SAVEKMSG_MAGIC2 0x4B4D5347 savekmsg ``arch/*/amiga/config.c``
CS_STATE_MAGIC 0x4c4f4749 cs_state ``sound/oss/cs46xx.c``
SLAB_C_MAGIC 0x4f17a36d kmem_cache ``mm/slab.c``
COW_MAGIC 0x4f4f4f4d cow_header_v1 ``arch/um/drivers/ubd_user.c``
I810_CARD_MAGIC 0x5072696E i810_card ``sound/oss/i810_audio.c``
TRIDENT_CARD_MAGIC 0x5072696E trident_card ``sound/oss/trident.c``
ROUTER_MAGIC 0x524d4157 wan_device [in ``wanrouter.h`` pre 3.9]
SAVEKMSG_MAGIC1 0x53415645 savekmsg ``arch/*/amiga/config.c``
GDA_MAGIC 0x58464552 gda ``arch/mips/include/asm/sn/gda.h``
RED_MAGIC1 0x5a2cf071 (any) ``mm/slab.c``
EEPROM_MAGIC_VALUE 0x5ab478d2 lanai_dev ``drivers/atm/lanai.c``
HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state ``include/linux/hdlcdrv.h``
PCXX_MAGIC 0x5c6df104 channel ``drivers/char/pcxx.h``
KV_MAGIC 0x5f4b565f kernel_vars_s ``arch/mips/include/asm/sn/klkernvars.h``
I810_STATE_MAGIC 0x63657373 i810_state ``sound/oss/i810_audio.c``
TRIDENT_STATE_MAGIC 0x63657373 trient_state ``sound/oss/trident.c``
M3_CARD_MAGIC 0x646e6f50 m3_card ``sound/oss/maestro3.c``
FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fore200e.h``
SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h``
SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h``
LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h``
M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c``
VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c``
KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c``
PWC_MAGIC 0x89DC10AB pwc_device ``drivers/usb/media/pwc.h``
NBD_REPLY_MAGIC 0x96744668 nbd_reply ``include/linux/nbd.h``
ENI155_MAGIC 0xa54b872d midway_eprom ``drivers/atm/eni.h``
CODA_MAGIC 0xC0DAC0DA coda_file_info ``fs/coda/coda_fs_i.h``
YAM_MAGIC 0xF10A7654 yam_port ``drivers/net/hamradio/yam.c``
CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c``
QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry ``drivers/scsi/arm/queue.c``
QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry ``drivers/scsi/arm/queue.c``
HTB_CMAGIC 0xFEFAFEF1 htb_class ``net/sched/sch_htb.c``
NMI_MAGIC 0x48414d4d455201 nmi_s ``arch/mips/include/asm/sn/nmi.h``
===================== ================ ======================== ==========================================
Da notare che ci sono anche dei numeri magici specifici per driver nel
*sound memory management*. Consultate ``include/sound/sndmagic.h`` per una
lista completa. Molti driver audio OSS hanno i loro numeri magici costruiti a
partire dall'identificativo PCI della scheda audio - nemmeno questi sono
elencati in questo file.
Il file-system HFS è un altro grande utilizzatore di numeri magici - potete
trovarli qui ``fs/hfs/hfs.h``.

66
Documentation/translations/zh_CN/process/magic-number.rst
View File

@ -58,83 +58,17 @@ Linux 魔术数
魔术数名 数字 结构 文件
===================== ================ ======================== ==========================================
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``
FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h``
FF_MAGIC 0x4646 fc_info ``drivers/net/iph5526_novram.c``
PTY_MAGIC 0x5001 ``drivers/char/pty.c``
PPP_MAGIC 0x5002 ppp ``include/linux/if_pppvar.h``
SSTATE_MAGIC 0x5302 serial_state ``include/linux/serial.h``
SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h``
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
USB_SERIAL_MAGIC 0x6702 usb_serial ``drivers/usb/serial/usb-serial.h``
FULL_DUPLEX_MAGIC 0x6969 ``drivers/net/ethernet/dec/tulip/de2104x.c``
USB_BLUETOOTH_MAGIC 0x6d02 usb_bluetooth ``drivers/usb/class/bluetty.c``
RFCOMM_TTY_MAGIC 0x6d02 ``net/bluetooth/rfcomm/tty.c``
USB_SERIAL_PORT_MAGIC 0x7301 usb_serial_port ``drivers/usb/serial/usb-serial.h``
CG_MAGIC 0x00090255 ufs_cylinder_group ``include/linux/ufs_fs.h``
LSEMAGIC 0x05091998 lse ``drivers/fc4/fc.c``
GDTIOCTL_MAGIC 0x06030f07 gdth_iowr_str ``drivers/scsi/gdth_ioctl.h``
RIEBL_MAGIC 0x09051990 ``drivers/net/atarilance.c``
NBD_REQUEST_MAGIC 0x12560953 nbd_request ``include/linux/nbd.h``
RED_MAGIC2 0x170fc2a5 (any) ``mm/slab.c``
BAYCOM_MAGIC 0x19730510 baycom_state ``drivers/net/baycom_epp.c``
ISDN_X25IFACE_MAGIC 0x1e75a2b9 isdn_x25iface_proto_data ``drivers/isdn/isdn_x25iface.h``
ECP_MAGIC 0x21504345 cdkecpsig ``include/linux/cdk.h``
LSOMAGIC 0x27091997 lso ``drivers/fc4/fc.c``
LSMAGIC 0x2a3b4d2a ls ``drivers/fc4/fc.c``
WANPIPE_MAGIC 0x414C4453 sdla_{dump,exec} ``include/linux/wanpipe.h``
CS_CARD_MAGIC 0x43525553 cs_card ``sound/oss/cs46xx.c``
LABELCL_MAGIC 0x4857434c labelcl_info_s ``include/asm/ia64/sn/labelcl.h``
ISDN_ASYNC_MAGIC 0x49344C01 modem_info ``include/linux/isdn.h``
CTC_ASYNC_MAGIC 0x49344C01 ctc_tty_info ``drivers/s390/net/ctctty.c``
ISDN_NET_MAGIC 0x49344C02 isdn_net_local_s ``drivers/isdn/i4l/isdn_net_lib.h``
SAVEKMSG_MAGIC2 0x4B4D5347 savekmsg ``arch/*/amiga/config.c``
CS_STATE_MAGIC 0x4c4f4749 cs_state ``sound/oss/cs46xx.c``
SLAB_C_MAGIC 0x4f17a36d kmem_cache ``mm/slab.c``
COW_MAGIC 0x4f4f4f4d cow_header_v1 ``arch/um/drivers/ubd_user.c``
I810_CARD_MAGIC 0x5072696E i810_card ``sound/oss/i810_audio.c``
TRIDENT_CARD_MAGIC 0x5072696E trident_card ``sound/oss/trident.c``
ROUTER_MAGIC 0x524d4157 wan_device [in ``wanrouter.h`` pre 3.9]
SAVEKMSG_MAGIC1 0x53415645 savekmsg ``arch/*/amiga/config.c``
GDA_MAGIC 0x58464552 gda ``arch/mips/include/asm/sn/gda.h``
RED_MAGIC1 0x5a2cf071 (any) ``mm/slab.c``
EEPROM_MAGIC_VALUE 0x5ab478d2 lanai_dev ``drivers/atm/lanai.c``
HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state ``include/linux/hdlcdrv.h``
PCXX_MAGIC 0x5c6df104 channel ``drivers/char/pcxx.h``
KV_MAGIC 0x5f4b565f kernel_vars_s ``arch/mips/include/asm/sn/klkernvars.h``
I810_STATE_MAGIC 0x63657373 i810_state ``sound/oss/i810_audio.c``
TRIDENT_STATE_MAGIC 0x63657373 trient_state ``sound/oss/trident.c``
M3_CARD_MAGIC 0x646e6f50 m3_card ``sound/oss/maestro3.c``
FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fore200e.h``
SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h``
SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h``
LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h``
M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c``
VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c``
KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c``
PWC_MAGIC 0x89DC10AB pwc_device ``drivers/usb/media/pwc.h``
NBD_REPLY_MAGIC 0x96744668 nbd_reply ``include/linux/nbd.h``
ENI155_MAGIC 0xa54b872d midway_eprom ``drivers/atm/eni.h``
CODA_MAGIC 0xC0DAC0DA coda_file_info ``fs/coda/coda_fs_i.h``
DPMEM_MAGIC 0xc0ffee11 gdt_pci_sram ``drivers/scsi/gdth.h``
YAM_MAGIC 0xF10A7654 yam_port ``drivers/net/hamradio/yam.c``
CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c``
QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry ``drivers/scsi/arm/queue.c``
QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry ``drivers/scsi/arm/queue.c``
HTB_CMAGIC 0xFEFAFEF1 htb_class ``net/sched/sch_htb.c``
NMI_MAGIC 0x48414d4d455201 nmi_s ``arch/mips/include/asm/sn/nmi.h``
===================== ================ ======================== ==========================================
请注意，在声音记忆管理中仍然有一些特殊的为每个驱动定义的魔术值。查看include/sound/sndmagic.h来获取他们完整的列表信息。很多OSS声音驱动拥有自己从声卡PCI ID构建的魔术值-他们也没有被列在这里。
IrDA子系统也使用了大量的自己的魔术值，查看include/net/irda/irda.h来获取他们完整的信息。
HFS是另外一个比较大的使用魔术值的文件系统-你可以在fs/hfs/hfs.h中找到他们。

67
Documentation/translations/zh_TW/process/magic-number.rst
View File

@ -61,84 +61,17 @@ Linux 魔術數
魔術數名 數字 結構 文件
===================== ================ ======================== ==========================================
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
CMAGIC 0x0111 user ``include/linux/a.out.h``
MKISS_DRIVER_MAGIC 0x04bf mkiss_channel ``drivers/net/mkiss.h``
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
DB_MAGIC 0x4442 fc_info ``drivers/net/iph5526_novram.c``
DL_MAGIC 0x444d fc_info ``drivers/net/iph5526_novram.c``
FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h``
FF_MAGIC 0x4646 fc_info ``drivers/net/iph5526_novram.c``
PTY_MAGIC 0x5001 ``drivers/char/pty.c``
PPP_MAGIC 0x5002 ppp ``include/linux/if_pppvar.h``
SSTATE_MAGIC 0x5302 serial_state ``include/linux/serial.h``
SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h``
STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
USB_SERIAL_MAGIC 0x6702 usb_serial ``drivers/usb/serial/usb-serial.h``
FULL_DUPLEX_MAGIC 0x6969 ``drivers/net/ethernet/dec/tulip/de2104x.c``
USB_BLUETOOTH_MAGIC 0x6d02 usb_bluetooth ``drivers/usb/class/bluetty.c``
RFCOMM_TTY_MAGIC 0x6d02 ``net/bluetooth/rfcomm/tty.c``
USB_SERIAL_PORT_MAGIC 0x7301 usb_serial_port ``drivers/usb/serial/usb-serial.h``
CG_MAGIC 0x00090255 ufs_cylinder_group ``include/linux/ufs_fs.h``
LSEMAGIC 0x05091998 lse ``drivers/fc4/fc.c``
GDTIOCTL_MAGIC 0x06030f07 gdth_iowr_str ``drivers/scsi/gdth_ioctl.h``
RIEBL_MAGIC 0x09051990 ``drivers/net/atarilance.c``
NBD_REQUEST_MAGIC 0x12560953 nbd_request ``include/linux/nbd.h``
RED_MAGIC2 0x170fc2a5 (any) ``mm/slab.c``
BAYCOM_MAGIC 0x19730510 baycom_state ``drivers/net/baycom_epp.c``
ISDN_X25IFACE_MAGIC 0x1e75a2b9 isdn_x25iface_proto_data ``drivers/isdn/isdn_x25iface.h``
ECP_MAGIC 0x21504345 cdkecpsig ``include/linux/cdk.h``
LSOMAGIC 0x27091997 lso ``drivers/fc4/fc.c``
LSMAGIC 0x2a3b4d2a ls ``drivers/fc4/fc.c``
WANPIPE_MAGIC 0x414C4453 sdla_{dump,exec} ``include/linux/wanpipe.h``
CS_CARD_MAGIC 0x43525553 cs_card ``sound/oss/cs46xx.c``
LABELCL_MAGIC 0x4857434c labelcl_info_s ``include/asm/ia64/sn/labelcl.h``
ISDN_ASYNC_MAGIC 0x49344C01 modem_info ``include/linux/isdn.h``
CTC_ASYNC_MAGIC 0x49344C01 ctc_tty_info ``drivers/s390/net/ctctty.c``
ISDN_NET_MAGIC 0x49344C02 isdn_net_local_s ``drivers/isdn/i4l/isdn_net_lib.h``
SAVEKMSG_MAGIC2 0x4B4D5347 savekmsg ``arch/*/amiga/config.c``
CS_STATE_MAGIC 0x4c4f4749 cs_state ``sound/oss/cs46xx.c``
SLAB_C_MAGIC 0x4f17a36d kmem_cache ``mm/slab.c``
COW_MAGIC 0x4f4f4f4d cow_header_v1 ``arch/um/drivers/ubd_user.c``
I810_CARD_MAGIC 0x5072696E i810_card ``sound/oss/i810_audio.c``
TRIDENT_CARD_MAGIC 0x5072696E trident_card ``sound/oss/trident.c``
ROUTER_MAGIC 0x524d4157 wan_device [in ``wanrouter.h`` pre 3.9]
SAVEKMSG_MAGIC1 0x53415645 savekmsg ``arch/*/amiga/config.c``
GDA_MAGIC 0x58464552 gda ``arch/mips/include/asm/sn/gda.h``
RED_MAGIC1 0x5a2cf071 (any) ``mm/slab.c``
EEPROM_MAGIC_VALUE 0x5ab478d2 lanai_dev ``drivers/atm/lanai.c``
HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state ``include/linux/hdlcdrv.h``
PCXX_MAGIC 0x5c6df104 channel ``drivers/char/pcxx.h``
KV_MAGIC 0x5f4b565f kernel_vars_s ``arch/mips/include/asm/sn/klkernvars.h``
I810_STATE_MAGIC 0x63657373 i810_state ``sound/oss/i810_audio.c``
TRIDENT_STATE_MAGIC 0x63657373 trient_state ``sound/oss/trident.c``
M3_CARD_MAGIC 0x646e6f50 m3_card ``sound/oss/maestro3.c``
FW_HEADER_MAGIC 0x65726F66 fw_header ``drivers/atm/fore200e.h``
SLOT_MAGIC 0x67267321 slot ``drivers/hotplug/cpqphp.h``
SLOT_MAGIC 0x67267322 slot ``drivers/hotplug/acpiphp.h``
LO_MAGIC 0x68797548 nbd_device ``include/linux/nbd.h``
M3_STATE_MAGIC 0x734d724d m3_state ``sound/oss/maestro3.c``
VMALLOC_MAGIC 0x87654320 snd_alloc_track ``sound/core/memory.c``
KMALLOC_MAGIC 0x87654321 snd_alloc_track ``sound/core/memory.c``
PWC_MAGIC 0x89DC10AB pwc_device ``drivers/usb/media/pwc.h``
NBD_REPLY_MAGIC 0x96744668 nbd_reply ``include/linux/nbd.h``
ENI155_MAGIC 0xa54b872d midway_eprom ``drivers/atm/eni.h``
CODA_MAGIC 0xC0DAC0DA coda_file_info ``fs/coda/coda_fs_i.h``
DPMEM_MAGIC 0xc0ffee11 gdt_pci_sram ``drivers/scsi/gdth.h``
YAM_MAGIC 0xF10A7654 yam_port ``drivers/net/hamradio/yam.c``
CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c``
QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry ``drivers/scsi/arm/queue.c``
QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry ``drivers/scsi/arm/queue.c``
HTB_CMAGIC 0xFEFAFEF1 htb_class ``net/sched/sch_htb.c``
NMI_MAGIC 0x48414d4d455201 nmi_s ``arch/mips/include/asm/sn/nmi.h``
===================== ================ ======================== ==========================================
請注意，在聲音記憶管理中仍然有一些特殊的爲每個驅動定義的魔術值。查看include/sound/sndmagic.h來獲取他們完整的列表信息。很多OSS聲音驅動擁有自己從音效卡PCI ID構建的魔術值-他們也沒有被列在這裡。
IrDA子系統也使用了大量的自己的魔術值，查看include/net/irda/irda.h來獲取他們完整的信息。
HFS是另外一個比較大的使用魔術值的文件系統-你可以在fs/hfs/hfs.h中找到他們。

2
MAINTAINERS
View File

@ -7235,6 +7235,8 @@ M: Jason Baron <jbaron@akamai.com>
S: Maintained
F: include/linux/dynamic_debug.h
F: lib/dynamic_debug.c
M: Jim Cromie <jim.cromie@gmail.com>
F: lib/test_dynamic_debug.c
DYNAMIC INTERRUPT MODERATION
M: Tal Gilboa <talgi@nvidia.com>

2
arch/mips/include/asm/sn/gda.h
View File

@ -16,8 +16,6 @@
#include <asm/sn/addrs.h>
#define GDA_MAGIC 0x58464552
/*
* GDA Version History
*

2
drivers/base/base.h
View File

@ -154,8 +154,6 @@ extern void driver_remove_groups(struct device_driver *drv,
const struct attribute_group **groups);
void device_driver_detach(struct device *dev);
extern char *make_class_name(const char *name, struct kobject *kobj);
extern int devres_release_all(struct device *dev);
extern void device_block_probing(void);
extern void device_unblock_probing(void);

2
drivers/base/class.c
View File

@ -260,7 +260,7 @@ EXPORT_SYMBOL_GPL(__class_create);
*/
void class_destroy(struct class *cls)
{
if ((cls == NULL) || (IS_ERR(cls)))
if (IS_ERR_OR_NULL(cls))
return;
class_unregister(cls);

4
drivers/base/core.c
View File

@ -2509,7 +2509,7 @@ static ssize_t uevent_store(struct device *dev, struct device_attribute *attr,
rc = kobject_synth_uevent(&dev->kobj, buf, count);
if (rc) {
dev_err(dev, "uevent: failed to send synthetic uevent\n");
dev_err(dev, "uevent: failed to send synthetic uevent: %d\n", rc);
return rc;
}
@ -4170,7 +4170,7 @@ device_create_groups_vargs(struct class *class, struct device *parent,
struct device *dev = NULL;
int retval = -ENODEV;
if (class == NULL || IS_ERR(class))
if (IS_ERR_OR_NULL(class))
goto error;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);

2
drivers/base/dd.c
View File

@ -836,7 +836,7 @@ static int __init save_async_options(char *buf)
if (strlen(buf) >= ASYNC_DRV_NAMES_MAX_LEN)
pr_warn("Too long list of driver names for 'driver_async_probe'!\n");
strlcpy(async_probe_drv_names, buf, ASYNC_DRV_NAMES_MAX_LEN);
strscpy(async_probe_drv_names, buf, ASYNC_DRV_NAMES_MAX_LEN);
async_probe_default = parse_option_str(async_probe_drv_names, "*");
return 1;

83
drivers/base/devcoredump.c
View File

@ -25,6 +25,47 @@ struct devcd_entry {
struct device devcd_dev;
void *data;
size_t datalen;
/*
* Here, mutex is required to serialize the calls to del_wk work between
* user/kernel space which happens when devcd is added with device_add()
* and that sends uevent to user space. User space reads the uevents,
* and calls to devcd_data_write() which try to modify the work which is
* not even initialized/queued from devcoredump.
*
*
*
* cpu0(X) cpu1(Y)
*
* dev_coredump() uevent sent to user space
* device_add() ======================> user space process Y reads the
* uevents writes to devcd fd
* which results into writes to
*
* devcd_data_write()
* mod_delayed_work()
* try_to_grab_pending()
* del_timer()
* debug_assert_init()
* INIT_DELAYED_WORK()
* schedule_delayed_work()
*
*
* Also, mutex alone would not be enough to avoid scheduling of
* del_wk work after it get flush from a call to devcd_free()
* mentioned as below.
*
* disabled_store()
* devcd_free()
* mutex_lock() devcd_data_write()
* flush_delayed_work()
* mutex_unlock()
* mutex_lock()
* mod_delayed_work()
* mutex_unlock()
* So, delete_work flag is required.
*/
struct mutex mutex;
bool delete_work;
struct module *owner;
ssize_t (*read)(char *buffer, loff_t offset, size_t count,
void *data, size_t datalen);
@ -84,7 +125,12 @@ static ssize_t devcd_data_write(struct file *filp, struct kobject *kobj,
struct device *dev = kobj_to_dev(kobj);
struct devcd_entry *devcd = dev_to_devcd(dev);
mod_delayed_work(system_wq, &devcd->del_wk, 0);
mutex_lock(&devcd->mutex);
if (!devcd->delete_work) {
devcd->delete_work = true;
mod_delayed_work(system_wq, &devcd->del_wk, 0);
}
mutex_unlock(&devcd->mutex);
return count;
}
@ -112,7 +158,12 @@ static int devcd_free(struct device *dev, void *data)
{
struct devcd_entry *devcd = dev_to_devcd(dev);
mutex_lock(&devcd->mutex);
if (!devcd->delete_work)
devcd->delete_work = true;
flush_delayed_work(&devcd->del_wk);
mutex_unlock(&devcd->mutex);
return 0;
}
@ -122,6 +173,30 @@ static ssize_t disabled_show(struct class *class, struct class_attribute *attr,
return sysfs_emit(buf, "%d\n", devcd_disabled);
}
/*
*
* disabled_store() worker()
* class_for_each_device(&devcd_class,
* NULL, NULL, devcd_free)
* ...
* ...
* while ((dev = class_dev_iter_next(&iter))
* devcd_del()
* device_del()
* put_device() <- last reference
* error = fn(dev, data) devcd_dev_release()
* devcd_free(dev, data) kfree(devcd)
* mutex_lock(&devcd->mutex);
*
*
* In the above diagram, It looks like disabled_store() would be racing with parallely
* running devcd_del() and result in memory abort while acquiring devcd->mutex which
* is called after kfree of devcd memory after dropping its last reference with
* put_device(). However, this will not happens as fn(dev, data) runs
* with its own reference to device via klist_node so it is not its last reference.
* so, above situation would not occur.
*/
static ssize_t disabled_store(struct class *class, struct class_attribute *attr,
const char *buf, size_t count)
{
@ -278,13 +353,16 @@ void dev_coredumpm(struct device *dev, struct module *owner,
devcd->read = read;
devcd->free = free;
devcd->failing_dev = get_device(dev);
devcd->delete_work = false;
mutex_init(&devcd->mutex);
device_initialize(&devcd->devcd_dev);
dev_set_name(&devcd->devcd_dev, "devcd%d",
atomic_inc_return(&devcd_count));
devcd->devcd_dev.class = &devcd_class;
mutex_lock(&devcd->mutex);
if (device_add(&devcd->devcd_dev))
goto put_device;
@ -301,10 +379,11 @@ void dev_coredumpm(struct device *dev, struct module *owner,
INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
schedule_delayed_work(&devcd->del_wk, DEVCD_TIMEOUT);
mutex_unlock(&devcd->mutex);
return;
put_device:
put_device(&devcd->devcd_dev);
mutex_unlock(&devcd->mutex);
put_module:
module_put(owner);
free:

4
drivers/base/devres.c
View File

@ -117,7 +117,9 @@ static __always_inline struct devres * alloc_dr(dr_release_t release,
if (unlikely(!dr))
return NULL;
memset(dr, 0, offsetof(struct devres, data));
/* No need to clear memory twice */
if (!(gfp & __GFP_ZERO))
memset(dr, 0, offsetof(struct devres, data));
INIT_LIST_HEAD(&dr->node.entry);
dr->node.release = release;

4
drivers/base/property.c
View File

@ -17,7 +17,7 @@
#include <linux/property.h>
#include <linux/phy.h>
struct fwnode_handle *dev_fwnode(struct device *dev)
struct fwnode_handle *dev_fwnode(const struct device *dev)
{
return IS_ENABLED(CONFIG_OF) && dev->of_node ?
of_fwnode_handle(dev->of_node) : dev->fwnode;
@ -1200,7 +1200,7 @@ int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
}
EXPORT_SYMBOL(fwnode_graph_parse_endpoint);
const void *device_get_match_data(struct device *dev)
const void *device_get_match_data(const struct device *dev)
{
return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
}

2
drivers/block/nbd.c
View File

@ -157,8 +157,6 @@ static struct dentry *nbd_dbg_dir;
#define nbd_name(nbd) ((nbd)->disk->disk_name)
#define NBD_MAGIC 0x68797548
#define NBD_DEF_BLKSIZE_BITS 10
static unsigned int nbds_max = 16;

12
drivers/gpu/drm/Kconfig
View File

@ -51,6 +51,18 @@ config DRM_DEBUG_MM
If in doubt, say "N".
config DRM_USE_DYNAMIC_DEBUG
bool "use dynamic debug to implement drm.debug"
default y
depends on DRM
depends on DYNAMIC_DEBUG || DYNAMIC_DEBUG_CORE
depends on JUMP_LABEL
help
Use dynamic-debug to avoid drm_debug_enabled() runtime overheads.
Due to callsite counts in DRM drivers (~4k in amdgpu) and 56
bytes per callsite, the .data costs can be substantial, and
are therefore configurable.
config DRM_KUNIT_TEST
tristate "KUnit tests for DRM" if !KUNIT_ALL_TESTS
depends on DRM && KUNIT

2
drivers/gpu/drm/Makefile
View File

@ -3,6 +3,8 @@
# Makefile for the drm device driver. This driver provides support for the
# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
CFLAGS-$(CONFIG_DRM_USE_DYNAMIC_DEBUG) += -DDYNAMIC_DEBUG_MODULE
drm-y := drm_aperture.o drm_auth.o drm_cache.o \
drm_file.o drm_gem.o drm_ioctl.o \
drm_drv.o \

14
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
View File

@ -38,6 +38,8 @@
#include <linux/mmu_notifier.h>
#include <linux/suspend.h>
#include <linux/cc_platform.h>
#include <linux/fb.h>
#include <linux/dynamic_debug.h>
#include "amdgpu.h"
#include "amdgpu_irq.h"
@ -186,6 +188,18 @@ int amdgpu_vcnfw_log;
static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work);
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
"DRM_UT_PRIME",
"DRM_UT_ATOMIC",
"DRM_UT_VBL",
"DRM_UT_STATE",
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
struct amdgpu_mgpu_info mgpu_info = {
.mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
.delayed_reset_work = __DELAYED_WORK_INITIALIZER(

13
drivers/gpu/drm/display/drm_dp_helper.c
View File

@ -30,6 +30,7 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/string_helpers.h>
#include <linux/dynamic_debug.h>
#include <drm/display/drm_dp_helper.h>
#include <drm/display/drm_dp_mst_helper.h>
@ -40,6 +41,18 @@
#include "drm_dp_helper_internal.h"
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
"DRM_UT_PRIME",
"DRM_UT_ATOMIC",
"DRM_UT_VBL",
"DRM_UT_STATE",
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
struct dp_aux_backlight {
struct backlight_device *base;
struct drm_dp_aux *aux;

13
drivers/gpu/drm/drm_crtc_helper.c
View File

@ -32,6 +32,7 @@
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/dynamic_debug.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
@ -50,6 +51,18 @@
#include "drm_crtc_helper_internal.h"
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
"DRM_UT_PRIME",
"DRM_UT_ATOMIC",
"DRM_UT_VBL",
"DRM_UT_STATE",
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
/**
* DOC: overview
*

48
drivers/gpu/drm/drm_print.c
View File

@ -23,14 +23,13 @@
* Rob Clark <robdclark@gmail.com>
*/
#define DEBUG /* for pr_debug() */
#include <linux/stdarg.h>
#include <linux/io.h>
#include <linux/moduleparam.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/dynamic_debug.h>
#include <drm/drm.h>
#include <drm/drm_drv.h>
@ -40,7 +39,7 @@
* __drm_debug: Enable debug output.
* Bitmask of DRM_UT_x. See include/drm/drm_print.h for details.
*/
unsigned int __drm_debug;
unsigned long __drm_debug;
EXPORT_SYMBOL(__drm_debug);
MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
@ -52,7 +51,30 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug cat
"\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n"
"\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n"
"\t\tBit 8 (0x100) will enable DP messages (displayport code)");
module_param_named(debug, __drm_debug, int, 0600);
#if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
module_param_named(debug, __drm_debug, ulong, 0600);
#else
/* classnames must match vals of enum drm_debug_category */
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
"DRM_UT_PRIME",
"DRM_UT_ATOMIC",
"DRM_UT_VBL",
"DRM_UT_STATE",
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
static struct ddebug_class_param drm_debug_bitmap = {
.bits = &__drm_debug,
.flags = "p",
.map = &drm_debug_classes,
};
module_param_cb(debug, &param_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
#endif
void __drm_puts_coredump(struct drm_printer *p, const char *str)
{
@ -162,7 +184,8 @@ EXPORT_SYMBOL(__drm_printfn_info);
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
{
pr_debug("%s %pV", p->prefix, vaf);
/* pr_debug callsite decorations are unhelpful here */
printk(KERN_DEBUG "%s %pV", p->prefix, vaf);
}
EXPORT_SYMBOL(__drm_printfn_debug);
@ -256,15 +279,16 @@ void drm_dev_printk(const struct device *dev, const char *level,
}
EXPORT_SYMBOL(drm_dev_printk);
void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
const char *format, ...)
void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
enum drm_debug_category category, const char *format, ...)
{
struct va_format vaf;
va_list args;
if (!drm_debug_enabled(category))
if (!__drm_debug_enabled(category))
return;
/* we know we are printing for either syslog, tracefs, or both */
va_start(args, format);
vaf.fmt = format;
vaf.va = &args;
@ -278,14 +302,14 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
va_end(args);
}
EXPORT_SYMBOL(drm_dev_dbg);
EXPORT_SYMBOL(__drm_dev_dbg);
void __drm_dbg(enum drm_debug_category category, const char *format, ...)
void ___drm_dbg(struct _ddebug *desc, enum drm_debug_category category, const char *format, ...)
{
struct va_format vaf;
va_list args;
if (!drm_debug_enabled(category))
if (!__drm_debug_enabled(category))
return;
va_start(args, format);
@ -297,7 +321,7 @@ void __drm_dbg(enum drm_debug_category category, const char *format, ...)
va_end(args);
}
EXPORT_SYMBOL(__drm_dbg);
EXPORT_SYMBOL(___drm_dbg);
void __drm_err(const char *format, ...)
{

12
drivers/gpu/drm/i915/i915_params.c
View File

@ -29,6 +29,18 @@
#include "i915_params.h"
#include "i915_drv.h"
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
"DRM_UT_PRIME",
"DRM_UT_ATOMIC",
"DRM_UT_VBL",
"DRM_UT_STATE",
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
#define i915_param_named(name, T, perm, desc) \
module_param_named(name, i915_modparams.name, T, perm); \
MODULE_PARM_DESC(name, desc)

13
drivers/gpu/drm/nouveau/nouveau_drm.c
View File

@ -28,6 +28,7 @@
#include <linux/pm_runtime.h>
#include <linux/vga_switcheroo.h>
#include <linux/mmu_notifier.h>
#include <linux/dynamic_debug.h>
#include <drm/drm_aperture.h>
#include <drm/drm_crtc_helper.h>
@ -70,6 +71,18 @@
#include "nouveau_svm.h"
#include "nouveau_dmem.h"
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
"DRM_UT_PRIME",
"DRM_UT_ATOMIC",
"DRM_UT_VBL",
"DRM_UT_STATE",
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
MODULE_PARM_DESC(config, "option string to pass to driver core");
static char *nouveau_config;
module_param_named(config, nouveau_config, charp, 0400);

16
fs/debugfs/file.c
View File

@ -1121,7 +1121,7 @@ void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
}
EXPORT_SYMBOL_GPL(debugfs_print_regs32);
static int debugfs_show_regset32(struct seq_file *s, void *data)
static int debugfs_regset32_show(struct seq_file *s, void *data)
{
struct debugfs_regset32 *regset = s->private;
@ -1136,17 +1136,7 @@ static int debugfs_show_regset32(struct seq_file *s, void *data)
return 0;
}
static int debugfs_open_regset32(struct inode *inode, struct file *file)
{
return single_open(file, debugfs_show_regset32, inode->i_private);
}
static const struct file_operations fops_regset32 = {
.open = debugfs_open_regset32,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
DEFINE_SHOW_ATTRIBUTE(debugfs_regset32);
/**
* debugfs_create_regset32 - create a debugfs file that returns register values
@ -1167,7 +1157,7 @@ void debugfs_create_regset32(const char *name, umode_t mode,
struct dentry *parent,
struct debugfs_regset32 *regset)
{
debugfs_create_file(name, mode, parent, regset, &fops_regset32);
debugfs_create_file(name, mode, parent, regset, &debugfs_regset32_fops);
}
EXPORT_SYMBOL_GPL(debugfs_create_regset32);

37
fs/debugfs/inode.c
View File

@ -82,6 +82,8 @@ struct debugfs_mount_opts {
kuid_t uid;
kgid_t gid;
umode_t mode;
/* Opt_* bitfield. */
unsigned int opts;
};
enum {
@ -111,6 +113,7 @@ static int debugfs_parse_options(char *data, struct debugfs_mount_opts *opts)
kgid_t gid;
char *p;
opts->opts = 0;
opts->mode = DEBUGFS_DEFAULT_MODE;
while ((p = strsep(&data, ",")) != NULL) {
@ -145,24 +148,44 @@ static int debugfs_parse_options(char *data, struct debugfs_mount_opts *opts)
* but traditionally debugfs has ignored all mount options
*/
}
opts->opts |= BIT(token);
}
return 0;
}
static int debugfs_apply_options(struct super_block *sb)
static void _debugfs_apply_options(struct super_block *sb, bool remount)
{
struct debugfs_fs_info *fsi = sb->s_fs_info;
struct inode *inode = d_inode(sb->s_root);
struct debugfs_mount_opts *opts = &fsi->mount_opts;
inode->i_mode &= ~S_IALLUGO;
inode->i_mode |= opts->mode;
/*
* On remount, only reset mode/uid/gid if they were provided as mount
* options.
*/
inode->i_uid = opts->uid;
inode->i_gid = opts->gid;
if (!remount || opts->opts & BIT(Opt_mode)) {
inode->i_mode &= ~S_IALLUGO;
inode->i_mode |= opts->mode;
}
return 0;
if (!remount || opts->opts & BIT(Opt_uid))
inode->i_uid = opts->uid;
if (!remount || opts->opts & BIT(Opt_gid))
inode->i_gid = opts->gid;
}
static void debugfs_apply_options(struct super_block *sb)
{
_debugfs_apply_options(sb, false);
}
static void debugfs_apply_options_remount(struct super_block *sb)
{
_debugfs_apply_options(sb, true);
}
static int debugfs_remount(struct super_block *sb, int *flags, char *data)
@ -175,7 +198,7 @@ static int debugfs_remount(struct super_block *sb, int *flags, char *data)
if (err)
goto fail;
debugfs_apply_options(sb);
debugfs_apply_options_remount(sb);
fail:
return err;

107
fs/kernfs/dir.c
View File

@ -472,6 +472,16 @@ static void kernfs_drain(struct kernfs_node *kn)
lockdep_assert_held_write(&root->kernfs_rwsem);
WARN_ON_ONCE(kernfs_active(kn));
/*
* Skip draining if already fully drained. This avoids draining and its
* lockdep annotations for nodes which have never been activated
* allowing embedding kernfs_remove() in create error paths without
* worrying about draining.
*/
if (atomic_read(&kn->active) == KN_DEACTIVATED_BIAS &&
!kernfs_should_drain_open_files(kn))
return;
up_write(&root->kernfs_rwsem);
if (kernfs_lockdep(kn)) {
@ -480,7 +490,6 @@ static void kernfs_drain(struct kernfs_node *kn)
lock_contended(&kn->dep_map, _RET_IP_);
}
/* but everyone should wait for draining */
wait_event(root->deactivate_waitq,
atomic_read(&kn->active) == KN_DEACTIVATED_BIAS);
@ -489,7 +498,8 @@ static void kernfs_drain(struct kernfs_node *kn)
rwsem_release(&kn->dep_map, _RET_IP_);
}
kernfs_drain_open_files(kn);
if (kernfs_should_drain_open_files(kn))
kernfs_drain_open_files(kn);
down_write(&root->kernfs_rwsem);
}
@ -695,13 +705,7 @@ struct kernfs_node *kernfs_find_and_get_node_by_id(struct kernfs_root *root,
goto err_unlock;
}
/*
* ACTIVATED is protected with kernfs_mutex but it was clear when
* @kn was added to idr and we just wanna see it set. No need to
* grab kernfs_mutex.
*/
if (unlikely(!(kn->flags & KERNFS_ACTIVATED) ||
!atomic_inc_not_zero(&kn->count)))
if (unlikely(!kernfs_active(kn) || !atomic_inc_not_zero(&kn->count)))
goto err_unlock;
spin_unlock(&kernfs_idr_lock);
@ -743,10 +747,7 @@ int kernfs_add_one(struct kernfs_node *kn)
goto out_unlock;
ret = -ENOENT;
if (parent->flags & KERNFS_EMPTY_DIR)
goto out_unlock;
if ((parent->flags & KERNFS_ACTIVATED) && !kernfs_active(parent))
if (parent->flags & (KERNFS_REMOVING | KERNFS_EMPTY_DIR))
goto out_unlock;
kn->hash = kernfs_name_hash(kn->name, kn->ns);
@ -1304,6 +1305,21 @@ static struct kernfs_node *kernfs_next_descendant_post(struct kernfs_node *pos,
return pos->parent;
}
static void kernfs_activate_one(struct kernfs_node *kn)
{
lockdep_assert_held_write(&kernfs_root(kn)->kernfs_rwsem);
kn->flags |= KERNFS_ACTIVATED;
if (kernfs_active(kn) || (kn->flags & (KERNFS_HIDDEN | KERNFS_REMOVING)))
return;
WARN_ON_ONCE(kn->parent && RB_EMPTY_NODE(&kn->rb));
WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
atomic_sub(KN_DEACTIVATED_BIAS, &kn->active);
}
/**
* kernfs_activate - activate a node which started deactivated
* @kn: kernfs_node whose subtree is to be activated
@ -1325,15 +1341,42 @@ void kernfs_activate(struct kernfs_node *kn)
down_write(&root->kernfs_rwsem);
pos = NULL;
while ((pos = kernfs_next_descendant_post(pos, kn))) {
if (pos->flags & KERNFS_ACTIVATED)
continue;
while ((pos = kernfs_next_descendant_post(pos, kn)))
kernfs_activate_one(pos);
WARN_ON_ONCE(pos->parent && RB_EMPTY_NODE(&pos->rb));
WARN_ON_ONCE(atomic_read(&pos->active) != KN_DEACTIVATED_BIAS);
up_write(&root->kernfs_rwsem);
}
atomic_sub(KN_DEACTIVATED_BIAS, &pos->active);
pos->flags |= KERNFS_ACTIVATED;
/**
* kernfs_show - show or hide a node
* @kn: kernfs_node to show or hide
* @show: whether to show or hide
*
* If @show is %false, @kn is marked hidden and deactivated. A hidden node is
* ignored in future activaitons. If %true, the mark is removed and activation
* state is restored. This function won't implicitly activate a new node in a
* %KERNFS_ROOT_CREATE_DEACTIVATED root which hasn't been activated yet.
*
* To avoid recursion complexities, directories aren't supported for now.
*/
void kernfs_show(struct kernfs_node *kn, bool show)
{
struct kernfs_root *root = kernfs_root(kn);
if (WARN_ON_ONCE(kernfs_type(kn) == KERNFS_DIR))
return;
down_write(&root->kernfs_rwsem);
if (show) {
kn->flags &= ~KERNFS_HIDDEN;
if (kn->flags & KERNFS_ACTIVATED)
kernfs_activate_one(kn);
} else {
kn->flags |= KERNFS_HIDDEN;
if (kernfs_active(kn))
atomic_add(KN_DEACTIVATED_BIAS, &kn->active);
kernfs_drain(kn);
}
up_write(&root->kernfs_rwsem);
@ -1358,34 +1401,27 @@ static void __kernfs_remove(struct kernfs_node *kn)
pr_debug("kernfs %s: removing\n", kn->name);
/* prevent any new usage under @kn by deactivating all nodes */
/* prevent new usage by marking all nodes removing and deactivating */
pos = NULL;
while ((pos = kernfs_next_descendant_post(pos, kn)))
while ((pos = kernfs_next_descendant_post(pos, kn))) {
pos->flags |= KERNFS_REMOVING;
if (kernfs_active(pos))
atomic_add(KN_DEACTIVATED_BIAS, &pos->active);
}
/* deactivate and unlink the subtree node-by-node */
do {
pos = kernfs_leftmost_descendant(kn);
/*
* kernfs_drain() drops kernfs_rwsem temporarily and @pos's
* kernfs_drain() may drop kernfs_rwsem temporarily and @pos's
* base ref could have been put by someone else by the time
* the function returns. Make sure it doesn't go away
* underneath us.
*/
kernfs_get(pos);
/*
* Drain iff @kn was activated. This avoids draining and
* its lockdep annotations for nodes which have never been
* activated and allows embedding kernfs_remove() in create
* error paths without worrying about draining.
*/
if (kn->flags & KERNFS_ACTIVATED)
kernfs_drain(pos);
else
WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
kernfs_drain(pos);
/*
* kernfs_unlink_sibling() succeeds once per node. Use it
@ -1585,8 +1621,11 @@ int kernfs_remove_by_name_ns(struct kernfs_node *parent, const char *name,
down_write(&root->kernfs_rwsem);
kn = kernfs_find_ns(parent, name, ns);
if (kn)
if (kn) {
kernfs_get(kn);
__kernfs_remove(kn);
kernfs_put(kn);
}
up_write(&root->kernfs_rwsem);

153
fs/kernfs/file.c
View File

@ -23,6 +23,8 @@ struct kernfs_open_node {
atomic_t event;
wait_queue_head_t poll;
struct list_head files; /* goes through kernfs_open_file.list */
unsigned int nr_mmapped;
unsigned int nr_to_release;
};
/*
@ -57,31 +59,17 @@ static inline struct mutex *kernfs_open_file_mutex_lock(struct kernfs_node *kn)
}
/**
* kernfs_deref_open_node - Get kernfs_open_node corresponding to @kn.
*
* @of: associated kernfs_open_file instance.
* @kn: target kernfs_node.
*
* Fetch and return ->attr.open of @kn if @of->list is non empty.
* If @of->list is not empty we can safely assume that @of is on
* @kn->attr.open->files list and this guarantees that @kn->attr.open
* will not vanish i.e. dereferencing outside RCU read-side critical
* section is safe here.
*
* The caller needs to make sure that @of->list is not empty.
* of_on - Return the kernfs_open_node of the specified kernfs_open_file
* @of: taret kernfs_open_file
*/
static struct kernfs_open_node *
kernfs_deref_open_node(struct kernfs_open_file *of, struct kernfs_node *kn)
static struct kernfs_open_node *of_on(struct kernfs_open_file *of)
{
struct kernfs_open_node *on;
on = rcu_dereference_check(kn->attr.open, !list_empty(&of->list));
return on;
return rcu_dereference_protected(of->kn->attr.open,
!list_empty(&of->list));
}
/**
* kernfs_deref_open_node_protected - Get kernfs_open_node corresponding to @kn
* kernfs_deref_open_node_locked - Get kernfs_open_node corresponding to @kn
*
* @kn: target kernfs_node.
*
@ -96,7 +84,7 @@ kernfs_deref_open_node(struct kernfs_open_file *of, struct kernfs_node *kn)
* The caller needs to make sure that kernfs_open_file_mutex is held.
*/
static struct kernfs_open_node *
kernfs_deref_open_node_protected(struct kernfs_node *kn)
kernfs_deref_open_node_locked(struct kernfs_node *kn)
{
return rcu_dereference_protected(kn->attr.open,
lockdep_is_held(kernfs_open_file_mutex_ptr(kn)));
@ -207,12 +195,8 @@ static void kernfs_seq_stop(struct seq_file *sf, void *v)
static int kernfs_seq_show(struct seq_file *sf, void *v)
{
struct kernfs_open_file *of = sf->private;
struct kernfs_open_node *on = kernfs_deref_open_node(of, of->kn);
if (!on)
return -EINVAL;
of->event = atomic_read(&on->event);
of->event = atomic_read(&of_on(of)->event);
return of->kn->attr.ops->seq_show(sf, v);
}
@ -235,7 +219,6 @@ static ssize_t kernfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
struct kernfs_open_file *of = kernfs_of(iocb->ki_filp);
ssize_t len = min_t(size_t, iov_iter_count(iter), PAGE_SIZE);
const struct kernfs_ops *ops;
struct kernfs_open_node *on;
char *buf;
buf = of->prealloc_buf;
@ -257,14 +240,7 @@ static ssize_t kernfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
goto out_free;
}
on = kernfs_deref_open_node(of, of->kn);
if (!on) {
len = -EINVAL;
mutex_unlock(&of->mutex);
goto out_free;
}
of->event = atomic_read(&on->event);
of->event = atomic_read(&of_on(of)->event);
ops = kernfs_ops(of->kn);
if (ops->read)
@ -553,6 +529,7 @@ static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma)
rc = 0;
of->mmapped = true;
of_on(of)->nr_mmapped++;
of->vm_ops = vma->vm_ops;
vma->vm_ops = &kernfs_vm_ops;
out_put:
@ -580,31 +557,30 @@ out_unlock:
static int kernfs_get_open_node(struct kernfs_node *kn,
struct kernfs_open_file *of)
{
struct kernfs_open_node *on, *new_on = NULL;
struct mutex *mutex = NULL;
struct kernfs_open_node *on;
struct mutex *mutex;
mutex = kernfs_open_file_mutex_lock(kn);
on = kernfs_deref_open_node_protected(kn);
on = kernfs_deref_open_node_locked(kn);
if (on) {
list_add_tail(&of->list, &on->files);
mutex_unlock(mutex);
return 0;
} else {
if (!on) {
/* not there, initialize a new one */
new_on = kmalloc(sizeof(*new_on), GFP_KERNEL);
if (!new_on) {
on = kzalloc(sizeof(*on), GFP_KERNEL);
if (!on) {
mutex_unlock(mutex);
return -ENOMEM;
}
atomic_set(&new_on->event, 1);
init_waitqueue_head(&new_on->poll);
INIT_LIST_HEAD(&new_on->files);
list_add_tail(&of->list, &new_on->files);
rcu_assign_pointer(kn->attr.open, new_on);
atomic_set(&on->event, 1);
init_waitqueue_head(&on->poll);
INIT_LIST_HEAD(&on->files);
rcu_assign_pointer(kn->attr.open, on);
}
mutex_unlock(mutex);
list_add_tail(&of->list, &on->files);
if (kn->flags & KERNFS_HAS_RELEASE)
on->nr_to_release++;
mutex_unlock(mutex);
return 0;
}
@ -613,6 +589,7 @@ static int kernfs_get_open_node(struct kernfs_node *kn,
*
* @kn: target kernfs_node
* @of: associated kernfs_open_file
* @open_failed: ->open() failed, cancel ->release()
*
* Unlink @of from list of @kn's associated open files. If list of
* associated open files becomes empty, disassociate and free
@ -622,21 +599,30 @@ static int kernfs_get_open_node(struct kernfs_node *kn,
* None.
*/
static void kernfs_unlink_open_file(struct kernfs_node *kn,
struct kernfs_open_file *of)
struct kernfs_open_file *of,
bool open_failed)
{
struct kernfs_open_node *on;
struct mutex *mutex = NULL;
struct mutex *mutex;
mutex = kernfs_open_file_mutex_lock(kn);
on = kernfs_deref_open_node_protected(kn);
on = kernfs_deref_open_node_locked(kn);
if (!on) {
mutex_unlock(mutex);
return;
}
if (of)
if (of) {
if (kn->flags & KERNFS_HAS_RELEASE) {
WARN_ON_ONCE(of->released == open_failed);
if (open_failed)
on->nr_to_release--;
}
if (of->mmapped)
on->nr_mmapped--;
list_del(&of->list);
}
if (list_empty(&on->files)) {
rcu_assign_pointer(kn->attr.open, NULL);
@ -763,7 +749,7 @@ static int kernfs_fop_open(struct inode *inode, struct file *file)
return 0;
err_put_node:
kernfs_unlink_open_file(kn, of);
kernfs_unlink_open_file(kn, of, true);
err_seq_release:
seq_release(inode, file);
err_free:
@ -795,6 +781,7 @@ static void kernfs_release_file(struct kernfs_node *kn,
*/
kn->attr.ops->release(of);
of->released = true;
of_on(of)->nr_to_release--;
}
}
@ -802,15 +789,16 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp)
{
struct kernfs_node *kn = inode->i_private;
struct kernfs_open_file *of = kernfs_of(filp);
struct mutex *mutex = NULL;
if (kn->flags & KERNFS_HAS_RELEASE) {
struct mutex *mutex;
mutex = kernfs_open_file_mutex_lock(kn);
kernfs_release_file(kn, of);
mutex_unlock(mutex);
}
kernfs_unlink_open_file(kn, of);
kernfs_unlink_open_file(kn, of, false);
seq_release(inode, filp);
kfree(of->prealloc_buf);
kfree(of);
@ -818,28 +806,33 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp)
return 0;
}
bool kernfs_should_drain_open_files(struct kernfs_node *kn)
{
struct kernfs_open_node *on;
bool ret;
/*
* @kn being deactivated guarantees that @kn->attr.open can't change
* beneath us making the lockless test below safe.
*/
WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
rcu_read_lock();
on = rcu_dereference(kn->attr.open);
ret = on && (on->nr_mmapped || on->nr_to_release);
rcu_read_unlock();
return ret;
}
void kernfs_drain_open_files(struct kernfs_node *kn)
{
struct kernfs_open_node *on;
struct kernfs_open_file *of;
struct mutex *mutex = NULL;
if (!(kn->flags & (KERNFS_HAS_MMAP | KERNFS_HAS_RELEASE)))
return;
/*
* lockless opportunistic check is safe below because no one is adding to
* ->attr.open at this point of time. This check allows early bail out
* if ->attr.open is already NULL. kernfs_unlink_open_file makes
* ->attr.open NULL only while holding kernfs_open_file_mutex so below
* check under kernfs_open_file_mutex_ptr(kn) will ensure bailing out if
* ->attr.open became NULL while waiting for the mutex.
*/
if (!rcu_access_pointer(kn->attr.open))
return;
struct mutex *mutex;
mutex = kernfs_open_file_mutex_lock(kn);
on = kernfs_deref_open_node_protected(kn);
on = kernfs_deref_open_node_locked(kn);
if (!on) {
mutex_unlock(mutex);
return;
@ -848,13 +841,17 @@ void kernfs_drain_open_files(struct kernfs_node *kn)
list_for_each_entry(of, &on->files, list) {
struct inode *inode = file_inode(of->file);
if (kn->flags & KERNFS_HAS_MMAP)
if (of->mmapped) {
unmap_mapping_range(inode->i_mapping, 0, 0, 1);
of->mmapped = false;
on->nr_mmapped--;
}
if (kn->flags & KERNFS_HAS_RELEASE)
kernfs_release_file(kn, of);
}
WARN_ON_ONCE(on->nr_mmapped || on->nr_to_release);
mutex_unlock(mutex);
}
@ -874,11 +871,7 @@ void kernfs_drain_open_files(struct kernfs_node *kn)
*/
__poll_t kernfs_generic_poll(struct kernfs_open_file *of, poll_table *wait)
{
struct kernfs_node *kn = kernfs_dentry_node(of->file->f_path.dentry);
struct kernfs_open_node *on = kernfs_deref_open_node(of, kn);
if (!on)
return EPOLLERR;
struct kernfs_open_node *on = of_on(of);
poll_wait(of->file, &on->poll, wait);

1
fs/kernfs/kernfs-internal.h
View File

@ -157,6 +157,7 @@ struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
*/
extern const struct file_operations kernfs_file_fops;
bool kernfs_should_drain_open_files(struct kernfs_node *kn);
void kernfs_drain_open_files(struct kernfs_node *kn);
/*

3
include/asm-generic/vmlinux.lds.h
View File

@ -353,6 +353,9 @@
*(__tracepoints) \
/* implement dynamic printk debug */ \
. = ALIGN(8); \
__start___dyndbg_classes = .; \
KEEP(*(__dyndbg_classes)) \
__stop___dyndbg_classes = .; \
__start___dyndbg = .; \
KEEP(*(__dyndbg)) \
__stop___dyndbg = .; \

78
include/drm/drm_print.h
View File

@ -31,11 +31,12 @@
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/dynamic_debug.h>
#include <drm/drm.h>
/* Do *not* use outside of drm_print.[ch]! */
extern unsigned int __drm_debug;
extern unsigned long __drm_debug;
/**
* DOC: print
@ -275,55 +276,75 @@ static inline struct drm_printer drm_err_printer(const char *prefix)
*
*/
enum drm_debug_category {
/* These names must match those in DYNAMIC_DEBUG_CLASSBITS */
/**
* @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c,
* drm_memory.c, ...
*/
DRM_UT_CORE = 0x01,
DRM_UT_CORE,
/**
* @DRM_UT_DRIVER: Used in the vendor specific part of the driver: i915,
* radeon, ... macro.
*/
DRM_UT_DRIVER = 0x02,
DRM_UT_DRIVER,
/**
* @DRM_UT_KMS: Used in the modesetting code.
*/
DRM_UT_KMS = 0x04,
DRM_UT_KMS,
/**
* @DRM_UT_PRIME: Used in the prime code.
*/
DRM_UT_PRIME = 0x08,
DRM_UT_PRIME,
/**
* @DRM_UT_ATOMIC: Used in the atomic code.
*/
DRM_UT_ATOMIC = 0x10,
DRM_UT_ATOMIC,
/**
* @DRM_UT_VBL: Used for verbose debug message in the vblank code.
*/
DRM_UT_VBL = 0x20,
DRM_UT_VBL,
/**
* @DRM_UT_STATE: Used for verbose atomic state debugging.
*/
DRM_UT_STATE = 0x40,
DRM_UT_STATE,
/**
* @DRM_UT_LEASE: Used in the lease code.
*/
DRM_UT_LEASE = 0x80,
DRM_UT_LEASE,
/**
* @DRM_UT_DP: Used in the DP code.
*/
DRM_UT_DP = 0x100,
DRM_UT_DP,
/**
* @DRM_UT_DRMRES: Used in the drm managed resources code.
*/
DRM_UT_DRMRES = 0x200,
DRM_UT_DRMRES
};
static inline bool drm_debug_enabled(enum drm_debug_category category)
static inline bool drm_debug_enabled_raw(enum drm_debug_category category)
{
return unlikely(__drm_debug & category);
return unlikely(__drm_debug & BIT(category));
}
#define drm_debug_enabled_instrumented(category) \
({ \
pr_debug("todo: is this frequent enough to optimize ?\n"); \
drm_debug_enabled_raw(category); \
})
#if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
/*
* the drm.debug API uses dyndbg, so each drm_*dbg macro/callsite gets
* a descriptor, and only enabled callsites are reachable. They use
* the private macro to avoid re-testing the enable-bit.
*/
#define __drm_debug_enabled(category) true
#define drm_debug_enabled(category) drm_debug_enabled_instrumented(category)
#else
#define __drm_debug_enabled(category) drm_debug_enabled_raw(category)
#define drm_debug_enabled(category) drm_debug_enabled_raw(category)
#endif
/*
* struct device based logging
*
@ -333,9 +354,10 @@ static inline bool drm_debug_enabled(enum drm_debug_category category)
__printf(3, 4)
void drm_dev_printk(const struct device *dev, const char *level,
const char *format, ...);
__printf(3, 4)
void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
const char *format, ...);
struct _ddebug;
__printf(4, 5)
void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
enum drm_debug_category category, const char *format, ...);
/**
* DRM_DEV_ERROR() - Error output.
@ -383,6 +405,15 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
} \
})
#if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
#define drm_dev_dbg(dev, cat, fmt, ...) \
__drm_dev_dbg(NULL, dev, cat, fmt, ##__VA_ARGS__)
#else
#define drm_dev_dbg(dev, cat, fmt, ...) \
_dynamic_func_call_cls(cat, fmt, __drm_dev_dbg, \
dev, cat, fmt, ##__VA_ARGS__)
#endif
/**
* DRM_DEV_DEBUG() - Debug output for generic drm code
*
@ -457,7 +488,7 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
#define drm_dbg_core(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_CORE, fmt, ##__VA_ARGS__)
#define drm_dbg(drm, fmt, ...) \
#define drm_dbg_driver(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
#define drm_dbg_kms(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_KMS, fmt, ##__VA_ARGS__)
@ -476,6 +507,7 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
#define drm_dbg_drmres(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRMRES, fmt, ##__VA_ARGS__)
#define drm_dbg(drm, fmt, ...) drm_dbg_driver(drm, fmt, ##__VA_ARGS__)
/*
* printk based logging
@ -483,11 +515,19 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
* Prefer drm_device based logging over device or prink based logging.
*/
__printf(2, 3)
void __drm_dbg(enum drm_debug_category category, const char *format, ...);
__printf(3, 4)
void ___drm_dbg(struct _ddebug *desc, enum drm_debug_category category, const char *format, ...);
__printf(1, 2)
void __drm_err(const char *format, ...);
#if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
#define __drm_dbg(fmt, ...) ___drm_dbg(NULL, fmt, ##__VA_ARGS__)
#else
#define __drm_dbg(cat, fmt, ...) \
_dynamic_func_call_cls(cat, fmt, ___drm_dbg, \
cat, fmt, ##__VA_ARGS__)
#endif
/* Macros to make printk easier */
#define _DRM_PRINTK(once, level, fmt, ...) \

1
include/linux/cgroup.h
View File

@ -114,6 +114,7 @@ int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_rm_cftypes(struct cftype *cfts);
void cgroup_file_notify(struct cgroup_file *cfile);
void cgroup_file_show(struct cgroup_file *cfile, bool show);
int task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);

174
include/linux/dynamic_debug.h
View File

@ -6,6 +6,8 @@
#include <linux/jump_label.h>
#endif
#include <linux/build_bug.h>
/*
* An instance of this structure is created in a special
* ELF section at every dynamic debug callsite. At runtime,
@ -21,6 +23,9 @@ struct _ddebug {
const char *filename;
const char *format;
unsigned int lineno:18;
#define CLS_BITS 6
unsigned int class_id:CLS_BITS;
#define _DPRINTK_CLASS_DFLT ((1 << CLS_BITS) - 1)
/*
* The flags field controls the behaviour at the callsite.
* The bits here are changed dynamically when the user
@ -51,15 +56,82 @@ struct _ddebug {
#endif
} __attribute__((aligned(8)));
enum class_map_type {
DD_CLASS_TYPE_DISJOINT_BITS,
/**
* DD_CLASS_TYPE_DISJOINT_BITS: classes are independent, one per bit.
* expecting hex input. Built for drm.debug, basis for other types.
*/
DD_CLASS_TYPE_LEVEL_NUM,
/**
* DD_CLASS_TYPE_LEVEL_NUM: input is numeric level, 0-N.
* N turns on just bits N-1 .. 0, so N=0 turns all bits off.
*/
DD_CLASS_TYPE_DISJOINT_NAMES,
/**
* DD_CLASS_TYPE_DISJOINT_NAMES: input is a CSV of [+-]CLASS_NAMES,
* classes are independent, like _DISJOINT_BITS.
*/
DD_CLASS_TYPE_LEVEL_NAMES,
/**
* DD_CLASS_TYPE_LEVEL_NAMES: input is a CSV of [+-]CLASS_NAMES,
* intended for names like: INFO,DEBUG,TRACE, with a module prefix
* avoid EMERG,ALERT,CRIT,ERR,WARNING: they're not debug
*/
};
struct ddebug_class_map {
struct list_head link;
struct module *mod;
const char *mod_name; /* needed for builtins */
const char **class_names;
const int length;
const int base; /* index of 1st .class_id, allows split/shared space */
enum class_map_type map_type;
};
/**
* DECLARE_DYNDBG_CLASSMAP - declare classnames known by a module
* @_var: a struct ddebug_class_map, passed to module_param_cb
* @_type: enum class_map_type, chooses bits/verbose, numeric/symbolic
* @_base: offset of 1st class-name. splits .class_id space
* @classes: class-names used to control class'd prdbgs
*/
#define DECLARE_DYNDBG_CLASSMAP(_var, _maptype, _base, ...) \
static const char *_var##_classnames[] = { __VA_ARGS__ }; \
static struct ddebug_class_map __aligned(8) __used \
__section("__dyndbg_classes") _var = { \
.mod = THIS_MODULE, \
.mod_name = KBUILD_MODNAME, \
.base = _base, \
.map_type = _maptype, \
.length = NUM_TYPE_ARGS(char*, __VA_ARGS__), \
.class_names = _var##_classnames, \
}
#define NUM_TYPE_ARGS(eltype, ...) \
(sizeof((eltype[]){__VA_ARGS__}) / sizeof(eltype))
/* encapsulate linker provided built-in (or module) dyndbg data */
struct _ddebug_info {
struct _ddebug *descs;
struct ddebug_class_map *classes;
unsigned int num_descs;
unsigned int num_classes;
};
struct ddebug_class_param {
union {
unsigned long *bits;
unsigned int *lvl;
};
char flags[8];
const struct ddebug_class_map *map;
};
#if defined(CONFIG_DYNAMIC_DEBUG_CORE)
/* exported for module authors to exercise >control */
int dynamic_debug_exec_queries(const char *query, const char *modname);
int ddebug_add_module(struct _ddebug_info *dyndbg, const char *modname);
int ddebug_add_module(struct _ddebug *tab, unsigned int n,
const char *modname);
extern int ddebug_remove_module(const char *mod_name);
extern __printf(2, 3)
void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...);
@ -87,7 +159,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
const struct ib_device *ibdev,
const char *fmt, ...);
#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \
#define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt) \
static struct _ddebug __aligned(8) \
__section("__dyndbg") name = { \
.modname = KBUILD_MODNAME, \
@ -96,8 +168,14 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
.format = (fmt), \
.lineno = __LINE__, \
.flags = _DPRINTK_FLAGS_DEFAULT, \
.class_id = cls, \
_DPRINTK_KEY_INIT \
}
}; \
BUILD_BUG_ON_MSG(cls > _DPRINTK_CLASS_DFLT, \
"classid value overflow")
#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \
DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, _DPRINTK_CLASS_DFLT, fmt)
#ifdef CONFIG_JUMP_LABEL
@ -128,17 +206,34 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
#endif /* CONFIG_JUMP_LABEL */
#define __dynamic_func_call(id, fmt, func, ...) do { \
DEFINE_DYNAMIC_DEBUG_METADATA(id, fmt); \
if (DYNAMIC_DEBUG_BRANCH(id)) \
func(&id, ##__VA_ARGS__); \
} while (0)
#define __dynamic_func_call_no_desc(id, fmt, func, ...) do { \
DEFINE_DYNAMIC_DEBUG_METADATA(id, fmt); \
/*
* Factory macros: ($prefix)dynamic_func_call($suffix)
*
* Lower layer (with __ prefix) gets the callsite metadata, and wraps
* the func inside a debug-branch/static-key construct. Upper layer
* (with _ prefix) does the UNIQUE_ID once, so that lower can ref the
* name/label multiple times, and tie the elements together.
* Multiple flavors:
* (|_cls): adds in _DPRINT_CLASS_DFLT as needed
* (|_no_desc): former gets callsite descriptor as 1st arg (for prdbgs)
*/
#define __dynamic_func_call_cls(id, cls, fmt, func, ...) do { \
DEFINE_DYNAMIC_DEBUG_METADATA_CLS(id, cls, fmt); \
if (DYNAMIC_DEBUG_BRANCH(id)) \
func(__VA_ARGS__); \
func(&id, ##__VA_ARGS__); \
} while (0)
#define __dynamic_func_call(id, fmt, func, ...) \
__dynamic_func_call_cls(id, _DPRINTK_CLASS_DFLT, fmt, \
func, ##__VA_ARGS__)
#define __dynamic_func_call_cls_no_desc(id, cls, fmt, func, ...) do { \
DEFINE_DYNAMIC_DEBUG_METADATA_CLS(id, cls, fmt); \
if (DYNAMIC_DEBUG_BRANCH(id)) \
func(__VA_ARGS__); \
} while (0)
#define __dynamic_func_call_no_desc(id, fmt, func, ...) \
__dynamic_func_call_cls_no_desc(id, _DPRINTK_CLASS_DFLT, \
fmt, func, ##__VA_ARGS__)
/*
* "Factory macro" for generating a call to func, guarded by a
@ -148,22 +243,33 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
* the varargs. Note that fmt is repeated in invocations of this
* macro.
*/
#define _dynamic_func_call_cls(cls, fmt, func, ...) \
__dynamic_func_call_cls(__UNIQUE_ID(ddebug), cls, fmt, func, ##__VA_ARGS__)
#define _dynamic_func_call(fmt, func, ...) \
__dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
_dynamic_func_call_cls(_DPRINTK_CLASS_DFLT, fmt, func, ##__VA_ARGS__)
/*
* A variant that does the same, except that the descriptor is not
* passed as the first argument to the function; it is only called
* with precisely the macro's varargs.
*/
#define _dynamic_func_call_no_desc(fmt, func, ...) \
__dynamic_func_call_no_desc(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
#define _dynamic_func_call_cls_no_desc(cls, fmt, func, ...) \
__dynamic_func_call_cls_no_desc(__UNIQUE_ID(ddebug), cls, fmt, \
func, ##__VA_ARGS__)
#define _dynamic_func_call_no_desc(fmt, func, ...) \
_dynamic_func_call_cls_no_desc(_DPRINTK_CLASS_DFLT, fmt, \
func, ##__VA_ARGS__)
#define dynamic_pr_debug_cls(cls, fmt, ...) \
_dynamic_func_call_cls(cls, fmt, __dynamic_pr_debug, \
pr_fmt(fmt), ##__VA_ARGS__)
#define dynamic_pr_debug(fmt, ...) \
_dynamic_func_call(fmt, __dynamic_pr_debug, \
_dynamic_func_call(fmt, __dynamic_pr_debug, \
pr_fmt(fmt), ##__VA_ARGS__)
#define dynamic_dev_dbg(dev, fmt, ...) \
_dynamic_func_call(fmt,__dynamic_dev_dbg, \
_dynamic_func_call(fmt, __dynamic_dev_dbg, \
dev, fmt, ##__VA_ARGS__)
#define dynamic_netdev_dbg(dev, fmt, ...) \
@ -181,14 +287,24 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
KERN_DEBUG, prefix_str, prefix_type, \
rowsize, groupsize, buf, len, ascii)
struct kernel_param;
int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp);
int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp);
/* for test only, generally expect drm.debug style macro wrappers */
#define __pr_debug_cls(cls, fmt, ...) do { \
BUILD_BUG_ON_MSG(!__builtin_constant_p(cls), \
"expecting constant class int/enum"); \
dynamic_pr_debug_cls(cls, fmt, ##__VA_ARGS__); \
} while (0)
#else /* !CONFIG_DYNAMIC_DEBUG_CORE */
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/printk.h>
static inline int ddebug_add_module(struct _ddebug *tab, unsigned int n,
const char *modname)
static inline int ddebug_add_module(struct _ddebug_info *dinfo, const char *modname)
{
return 0;
}
@ -201,7 +317,7 @@ static inline int ddebug_remove_module(const char *mod)
static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
const char *modname)
{
if (strstr(param, "dyndbg")) {
if (!strcmp(param, "dyndbg")) {
/* avoid pr_warn(), which wants pr_fmt() fully defined */
printk(KERN_WARNING "dyndbg param is supported only in "
"CONFIG_DYNAMIC_DEBUG builds\n");
@ -221,12 +337,14 @@ static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
rowsize, groupsize, buf, len, ascii); \
} while (0)
static inline int dynamic_debug_exec_queries(const char *query, const char *modname)
{
pr_warn("kernel not built with CONFIG_DYNAMIC_DEBUG_CORE\n");
return 0;
}
struct kernel_param;
static inline int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
{ return 0; }
static inline int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp)
{ return 0; }
#endif /* !CONFIG_DYNAMIC_DEBUG_CORE */
extern const struct kernel_param_ops param_ops_dyndbg_classes;
#endif

2
include/linux/io.h
View File

@ -59,8 +59,6 @@ void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
resource_size_t size);
void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
resource_size_t size);
void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset,
resource_size_t size);
void devm_iounmap(struct device *dev, void __iomem *addr);
int check_signature(const volatile void __iomem *io_addr,
const unsigned char *signature, int length);

3
include/linux/kernfs.h
View File

@ -108,10 +108,12 @@ enum kernfs_node_flag {
KERNFS_HAS_SEQ_SHOW = 0x0040,
KERNFS_HAS_MMAP = 0x0080,
KERNFS_LOCKDEP = 0x0100,
KERNFS_HIDDEN = 0x0200,
KERNFS_SUICIDAL = 0x0400,
KERNFS_SUICIDED = 0x0800,
KERNFS_EMPTY_DIR = 0x1000,
KERNFS_HAS_RELEASE = 0x2000,
KERNFS_REMOVING = 0x4000,
};
/* @flags for kernfs_create_root() */
@ -429,6 +431,7 @@ struct kernfs_node *kernfs_create_link(struct kernfs_node *parent,
const char *name,
struct kernfs_node *target);
void kernfs_activate(struct kernfs_node *kn);
void kernfs_show(struct kernfs_node *kn, bool show);
void kernfs_remove(struct kernfs_node *kn);
void kernfs_break_active_protection(struct kernfs_node *kn);
void kernfs_unbreak_active_protection(struct kernfs_node *kn);

4
include/linux/property.h
View File

@ -32,7 +32,7 @@ enum dev_dma_attr {
DEV_DMA_COHERENT,
};
struct fwnode_handle *dev_fwnode(struct device *dev);
struct fwnode_handle *dev_fwnode(const struct device *dev);
bool device_property_present(struct device *dev, const char *propname);
int device_property_read_u8_array(struct device *dev, const char *propname,
@ -387,7 +387,7 @@ bool device_dma_supported(struct device *dev);
enum dev_dma_attr device_get_dma_attr(struct device *dev);
const void *device_get_match_data(struct device *dev);
const void *device_get_match_data(const struct device *dev);
int device_get_phy_mode(struct device *dev);
int fwnode_get_phy_mode(struct fwnode_handle *fwnode);

20
kernel/cgroup/cgroup.c
View File

@ -4371,6 +4371,26 @@ void cgroup_file_notify(struct cgroup_file *cfile)
spin_unlock_irqrestore(&cgroup_file_kn_lock, flags);
}
/**
* cgroup_file_show - show or hide a hidden cgroup file
* @cfile: target cgroup_file obtained by setting cftype->file_offset
* @show: whether to show or hide
*/
void cgroup_file_show(struct cgroup_file *cfile, bool show)
{
struct kernfs_node *kn;
spin_lock_irq(&cgroup_file_kn_lock);
kn = cfile->kn;
kernfs_get(kn);
spin_unlock_irq(&cgroup_file_kn_lock);
if (kn)
kernfs_show(kn, show);
kernfs_put(kn);
}
/**
* css_next_child - find the next child of a given css
* @pos: the current position (%NULL to initiate traversal)

4
kernel/module/internal.h
View File

@ -53,6 +53,7 @@ extern const struct kernel_symbol __stop___ksymtab_gpl[];
extern const s32 __start___kcrctab[];
extern const s32 __start___kcrctab_gpl[];
#include <linux/dynamic_debug.h>
struct load_info {
const char *name;
/* pointer to module in temporary copy, freed at end of load_module() */
@ -62,8 +63,7 @@ struct load_info {
Elf_Shdr *sechdrs;
char *secstrings, *strtab;
unsigned long symoffs, stroffs, init_typeoffs, core_typeoffs;
struct _ddebug *debug;
unsigned int num_debug;
struct _ddebug_info dyndbg;
bool sig_ok;
#ifdef CONFIG_KALLSYMS
unsigned long mod_kallsyms_init_off;

20
kernel/module/main.c
View File

@ -1594,16 +1594,16 @@ static void free_modinfo(struct module *mod)
}
}
static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num)
static void dynamic_debug_setup(struct module *mod, struct _ddebug_info *dyndbg)
{
if (!debug)
if (!dyndbg->num_descs)
return;
ddebug_add_module(debug, num, mod->name);
ddebug_add_module(dyndbg, mod->name);
}
static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug)
static void dynamic_debug_remove(struct module *mod, struct _ddebug_info *dyndbg)
{
if (debug)
if (dyndbg->num_descs)
ddebug_remove_module(mod->name);
}
@ -2107,8 +2107,10 @@ static int find_module_sections(struct module *mod, struct load_info *info)
if (section_addr(info, "__obsparm"))
pr_warn("%s: Ignoring obsolete parameters\n", mod->name);
info->debug = section_objs(info, "__dyndbg",
sizeof(*info->debug), &info->num_debug);
info->dyndbg.descs = section_objs(info, "__dyndbg",
sizeof(*info->dyndbg.descs), &info->dyndbg.num_descs);
info->dyndbg.classes = section_objs(info, "__dyndbg_classes",
sizeof(*info->dyndbg.classes), &info->dyndbg.num_classes);
return 0;
}
@ -2799,7 +2801,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
}
init_build_id(mod, info);
dynamic_debug_setup(mod, info->debug, info->num_debug);
dynamic_debug_setup(mod, &info->dyndbg);
/* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
ftrace_module_init(mod);
@ -2863,7 +2865,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
ddebug_cleanup:
ftrace_release_mod(mod);
dynamic_debug_remove(mod, info->debug);
dynamic_debug_remove(mod, &info->dyndbg);
synchronize_rcu();
kfree(mod->args);
free_arch_cleanup:

10
lib/Kconfig.debug
View File

@ -2572,6 +2572,16 @@ config TEST_STATIC_KEYS
If unsure, say N.
config TEST_DYNAMIC_DEBUG
tristate "Test DYNAMIC_DEBUG"
depends on DYNAMIC_DEBUG
help
This module registers a tracer callback to count enabled
pr_debugs in a 'do_debugging' function, then alters their
enablements, calls the function, and compares counts.
If unsure, say N.
config TEST_KMOD
tristate "kmod stress tester"
depends on m

1
lib/Makefile
View File

@ -83,6 +83,7 @@ obj-$(CONFIG_TEST_SORT) += test_sort.o
obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
obj-$(CONFIG_TEST_DYNAMIC_DEBUG) += test_dynamic_debug.o
obj-$(CONFIG_TEST_PRINTF) += test_printf.o
obj-$(CONFIG_TEST_SCANF) += test_scanf.o
obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o

15
lib/devres.c
View File

@ -103,21 +103,6 @@ void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
}
EXPORT_SYMBOL(devm_ioremap_wc);
/**
* devm_ioremap_np - Managed ioremap_np()
* @dev: Generic device to remap IO address for
* @offset: Resource address to map
* @size: Size of map
*
* Managed ioremap_np(). Map is automatically unmapped on driver detach.
*/
void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset,
resource_size_t size)
{
return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_NP);
}
EXPORT_SYMBOL(devm_ioremap_np);
/**
* devm_iounmap - Managed iounmap()
* @dev: Generic device to unmap for

454
lib/dynamic_debug.c
View File

@ -41,9 +41,11 @@
extern struct _ddebug __start___dyndbg[];
extern struct _ddebug __stop___dyndbg[];
extern struct ddebug_class_map __start___dyndbg_classes[];
extern struct ddebug_class_map __stop___dyndbg_classes[];
struct ddebug_table {
struct list_head link;
struct list_head link, maps;
const char *mod_name;
unsigned int num_ddebugs;
struct _ddebug *ddebugs;
@ -54,12 +56,13 @@ struct ddebug_query {
const char *module;
const char *function;
const char *format;
const char *class_string;
unsigned int first_lineno, last_lineno;
};
struct ddebug_iter {
struct ddebug_table *table;
unsigned int idx;
int idx;
};
struct flag_settings {
@ -134,15 +137,33 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
fmtlen--;
}
v3pr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
msg,
query->function ?: "",
query->filename ?: "",
query->module ?: "",
fmtlen, query->format ?: "",
query->first_lineno, query->last_lineno);
v3pr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u class=%s\n",
msg,
query->function ?: "",
query->filename ?: "",
query->module ?: "",
fmtlen, query->format ?: "",
query->first_lineno, query->last_lineno, query->class_string);
}
static struct ddebug_class_map *ddebug_find_valid_class(struct ddebug_table const *dt,
const char *class_string, int *class_id)
{
struct ddebug_class_map *map;
int idx;
list_for_each_entry(map, &dt->maps, link) {
idx = match_string(map->class_names, map->length, class_string);
if (idx >= 0) {
*class_id = idx + map->base;
return map;
}
}
*class_id = -ENOENT;
return NULL;
}
#define __outvar /* filled by callee */
/*
* Search the tables for _ddebug's which match the given `query' and
* apply the `flags' and `mask' to them. Returns number of matching
@ -156,7 +177,9 @@ static int ddebug_change(const struct ddebug_query *query,
struct ddebug_table *dt;
unsigned int newflags;
unsigned int nfound = 0;
struct flagsbuf fbuf;
struct flagsbuf fbuf, nbuf;
struct ddebug_class_map *map = NULL;
int __outvar valid_class;
/* search for matching ddebugs */
mutex_lock(&ddebug_lock);
@ -167,9 +190,22 @@ static int ddebug_change(const struct ddebug_query *query,
!match_wildcard(query->module, dt->mod_name))
continue;
if (query->class_string) {
map = ddebug_find_valid_class(dt, query->class_string, &valid_class);
if (!map)
continue;
} else {
/* constrain query, do not touch class'd callsites */
valid_class = _DPRINTK_CLASS_DFLT;
}
for (i = 0; i < dt->num_ddebugs; i++) {
struct _ddebug *dp = &dt->ddebugs[i];
/* match site against query-class */
if (dp->class_id != valid_class)
continue;
/* match against the source filename */
if (query->filename &&
!match_wildcard(query->filename, dp->filename) &&
@ -211,16 +247,18 @@ static int ddebug_change(const struct ddebug_query *query,
continue;
#ifdef CONFIG_JUMP_LABEL
if (dp->flags & _DPRINTK_FLAGS_PRINT) {
if (!(modifiers->flags & _DPRINTK_FLAGS_PRINT))
if (!(newflags & _DPRINTK_FLAGS_PRINT))
static_branch_disable(&dp->key.dd_key_true);
} else if (modifiers->flags & _DPRINTK_FLAGS_PRINT)
} else if (newflags & _DPRINTK_FLAGS_PRINT) {
static_branch_enable(&dp->key.dd_key_true);
}
#endif
v4pr_info("changed %s:%d [%s]%s %s => %s\n",
trim_prefix(dp->filename), dp->lineno,
dt->mod_name, dp->function,
ddebug_describe_flags(dp->flags, &fbuf),
ddebug_describe_flags(newflags, &nbuf));
dp->flags = newflags;
v4pr_info("changed %s:%d [%s]%s =%s\n",
trim_prefix(dp->filename), dp->lineno,
dt->mod_name, dp->function,
ddebug_describe_flags(dp->flags, &fbuf));
}
}
mutex_unlock(&ddebug_lock);
@ -383,10 +421,6 @@ static int ddebug_parse_query(char *words[], int nwords,
return -EINVAL;
}
if (modname)
/* support $modname.dyndbg=<multiple queries> */
query->module = modname;
for (i = 0; i < nwords; i += 2) {
char *keyword = words[i];
char *arg = words[i+1];
@ -420,6 +454,8 @@ static int ddebug_parse_query(char *words[], int nwords,
} else if (!strcmp(keyword, "line")) {
if (parse_linerange(query, arg))
return -EINVAL;
} else if (!strcmp(keyword, "class")) {
rc = check_set(&query->class_string, arg, "class");
} else {
pr_err("unknown keyword \"%s\"\n", keyword);
return -EINVAL;
@ -427,6 +463,13 @@ static int ddebug_parse_query(char *words[], int nwords,
if (rc)
return rc;
}
if (!query->module && modname)
/*
* support $modname.dyndbg=<multiple queries>, when
* not given in the query itself
*/
query->module = modname;
vpr_info_dq(query, "parsed");
return 0;
}
@ -553,34 +596,217 @@ static int ddebug_exec_queries(char *query, const char *modname)
return nfound;
}
/**
* dynamic_debug_exec_queries - select and change dynamic-debug prints
* @query: query-string described in admin-guide/dynamic-debug-howto
* @modname: string containing module name, usually &module.mod_name
*
* This uses the >/proc/dynamic_debug/control reader, allowing module
* authors to modify their dynamic-debug callsites. The modname is
* canonically struct module.mod_name, but can also be null or a
* module-wildcard, for example: "drm*".
*/
int dynamic_debug_exec_queries(const char *query, const char *modname)
/* apply a new bitmap to the sys-knob's current bit-state */
static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
unsigned long *new_bits, unsigned long *old_bits)
{
int rc;
char *qry; /* writable copy of query */
#define QUERY_SIZE 128
char query[QUERY_SIZE];
const struct ddebug_class_map *map = dcp->map;
int matches = 0;
int bi, ct;
if (!query) {
pr_err("non-null query/command string expected\n");
v2pr_info("apply: 0x%lx to: 0x%lx\n", *new_bits, *old_bits);
for (bi = 0; bi < map->length; bi++) {
if (test_bit(bi, new_bits) == test_bit(bi, old_bits))
continue;
snprintf(query, QUERY_SIZE, "class %s %c%s", map->class_names[bi],
test_bit(bi, new_bits) ? '+' : '-', dcp->flags);
ct = ddebug_exec_queries(query, NULL);
matches += ct;
v2pr_info("bit_%d: %d matches on class: %s -> 0x%lx\n", bi,
ct, map->class_names[bi], *new_bits);
}
return matches;
}
/* stub to later conditionally add "$module." prefix where not already done */
#define KP_NAME(kp) kp->name
#define CLASSMAP_BITMASK(width) ((1UL << (width)) - 1)
/* accept comma-separated-list of [+-] classnames */
static int param_set_dyndbg_classnames(const char *instr, const struct kernel_param *kp)
{
const struct ddebug_class_param *dcp = kp->arg;
const struct ddebug_class_map *map = dcp->map;
unsigned long curr_bits, old_bits;
char *cl_str, *p, *tmp;
int cls_id, totct = 0;
bool wanted;
cl_str = tmp = kstrdup(instr, GFP_KERNEL);
p = strchr(cl_str, '\n');
if (p)
*p = '\0';
/* start with previously set state-bits, then modify */
curr_bits = old_bits = *dcp->bits;
vpr_info("\"%s\" > %s:0x%lx\n", cl_str, KP_NAME(kp), curr_bits);
for (; cl_str; cl_str = p) {
p = strchr(cl_str, ',');
if (p)
*p++ = '\0';
if (*cl_str == '-') {
wanted = false;
cl_str++;
} else {
wanted = true;
if (*cl_str == '+')
cl_str++;
}
cls_id = match_string(map->class_names, map->length, cl_str);
if (cls_id < 0) {
pr_err("%s unknown to %s\n", cl_str, KP_NAME(kp));
continue;
}
/* have one or more valid class_ids of one *_NAMES type */
switch (map->map_type) {
case DD_CLASS_TYPE_DISJOINT_NAMES:
/* the +/- pertains to a single bit */
if (test_bit(cls_id, &curr_bits) == wanted) {
v3pr_info("no change on %s\n", cl_str);
continue;
}
curr_bits ^= BIT(cls_id);
totct += ddebug_apply_class_bitmap(dcp, &curr_bits, dcp->bits);
*dcp->bits = curr_bits;
v2pr_info("%s: changed bit %d:%s\n", KP_NAME(kp), cls_id,
map->class_names[cls_id]);
break;
case DD_CLASS_TYPE_LEVEL_NAMES:
/* cls_id = N in 0..max. wanted +/- determines N or N-1 */
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
curr_bits = CLASSMAP_BITMASK(cls_id + (wanted ? 1 : 0 ));
totct += ddebug_apply_class_bitmap(dcp, &curr_bits, &old_bits);
*dcp->lvl = (cls_id + (wanted ? 1 : 0));
v2pr_info("%s: changed bit-%d: \"%s\" %lx->%lx\n", KP_NAME(kp), cls_id,
map->class_names[cls_id], old_bits, curr_bits);
break;
default:
pr_err("illegal map-type value %d\n", map->map_type);
}
}
kfree(tmp);
vpr_info("total matches: %d\n", totct);
return 0;
}
/**
* param_set_dyndbg_classes - class FOO >control
* @instr: string echo>d to sysfs, input depends on map_type
* @kp: kp->arg has state: bits/lvl, map, map_type
*
* Enable/disable prdbgs by their class, as given in the arguments to
* DECLARE_DYNDBG_CLASSMAP. For LEVEL map-types, enforce relative
* levels by bitpos.
*
* Returns: 0 or <0 if error.
*/
int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
{
const struct ddebug_class_param *dcp = kp->arg;
const struct ddebug_class_map *map = dcp->map;
unsigned long inrep, new_bits, old_bits;
int rc, totct = 0;
switch (map->map_type) {
case DD_CLASS_TYPE_DISJOINT_NAMES:
case DD_CLASS_TYPE_LEVEL_NAMES:
/* handle [+-]classnames list separately, we are done here */
return param_set_dyndbg_classnames(instr, kp);
case DD_CLASS_TYPE_DISJOINT_BITS:
case DD_CLASS_TYPE_LEVEL_NUM:
/* numeric input, accept and fall-thru */
rc = kstrtoul(instr, 0, &inrep);
if (rc) {
pr_err("expecting numeric input: %s > %s\n", instr, KP_NAME(kp));
return -EINVAL;
}
break;
default:
pr_err("%s: bad map type: %d\n", KP_NAME(kp), map->map_type);
return -EINVAL;
}
qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
if (!qry)
return -ENOMEM;
rc = ddebug_exec_queries(qry, modname);
kfree(qry);
return rc;
/* only _BITS,_NUM (numeric) map-types get here */
switch (map->map_type) {
case DD_CLASS_TYPE_DISJOINT_BITS:
/* expect bits. mask and warn if too many */
if (inrep & ~CLASSMAP_BITMASK(map->length)) {
pr_warn("%s: input: 0x%lx exceeds mask: 0x%lx, masking\n",
KP_NAME(kp), inrep, CLASSMAP_BITMASK(map->length));
inrep &= CLASSMAP_BITMASK(map->length);
}
v2pr_info("bits:%lx > %s\n", inrep, KP_NAME(kp));
totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits);
*dcp->bits = inrep;
break;
case DD_CLASS_TYPE_LEVEL_NUM:
/* input is bitpos, of highest verbosity to be enabled */
if (inrep > map->length) {
pr_warn("%s: level:%ld exceeds max:%d, clamping\n",
KP_NAME(kp), inrep, map->length);
inrep = map->length;
}
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
new_bits = CLASSMAP_BITMASK(inrep);
v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp));
totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits);
*dcp->lvl = inrep;
break;
default:
pr_warn("%s: bad map type: %d\n", KP_NAME(kp), map->map_type);
}
vpr_info("%s: total matches: %d\n", KP_NAME(kp), totct);
return 0;
}
EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
EXPORT_SYMBOL(param_set_dyndbg_classes);
/**
* param_get_dyndbg_classes - classes reader
* @buffer: string description of controlled bits -> classes
* @kp: kp->arg has state: bits, map
*
* Reads last written state, underlying prdbg state may have been
* altered by direct >control. Displays 0x for DISJOINT, 0-N for
* LEVEL Returns: #chars written or <0 on error
*/
int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp)
{
const struct ddebug_class_param *dcp = kp->arg;
const struct ddebug_class_map *map = dcp->map;
switch (map->map_type) {
case DD_CLASS_TYPE_DISJOINT_NAMES:
case DD_CLASS_TYPE_DISJOINT_BITS:
return scnprintf(buffer, PAGE_SIZE, "0x%lx\n", *dcp->bits);
case DD_CLASS_TYPE_LEVEL_NAMES:
case DD_CLASS_TYPE_LEVEL_NUM:
return scnprintf(buffer, PAGE_SIZE, "%d\n", *dcp->lvl);
default:
return -1;
}
}
EXPORT_SYMBOL(param_get_dyndbg_classes);
const struct kernel_param_ops param_ops_dyndbg_classes = {
.set = param_set_dyndbg_classes,
.get = param_get_dyndbg_classes,
};
EXPORT_SYMBOL(param_ops_dyndbg_classes);
#define PREFIX_SIZE 64
@ -803,13 +1029,12 @@ static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
{
if (list_empty(&ddebug_tables)) {
iter->table = NULL;
iter->idx = 0;
return NULL;
}
iter->table = list_entry(ddebug_tables.next,
struct ddebug_table, link);
iter->idx = 0;
return &iter->table->ddebugs[iter->idx];
iter->idx = iter->table->num_ddebugs;
return &iter->table->ddebugs[--iter->idx];
}
/*
@ -822,15 +1047,16 @@ static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
{
if (iter->table == NULL)
return NULL;
if (++iter->idx == iter->table->num_ddebugs) {
if (--iter->idx < 0) {
/* iterate to next table */
iter->idx = 0;
if (list_is_last(&iter->table->link, &ddebug_tables)) {
iter->table = NULL;
return NULL;
}
iter->table = list_entry(iter->table->link.next,
struct ddebug_table, link);
iter->idx = iter->table->num_ddebugs;
--iter->idx;
}
return &iter->table->ddebugs[iter->idx];
}
@ -876,6 +1102,20 @@ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
return dp;
}
#define class_in_range(class_id, map) \
(class_id >= map->base && class_id < map->base + map->length)
static const char *ddebug_class_name(struct ddebug_iter *iter, struct _ddebug *dp)
{
struct ddebug_class_map *map;
list_for_each_entry(map, &iter->table->maps, link)
if (class_in_range(dp->class_id, map))
return map->class_names[dp->class_id - map->base];
return NULL;
}
/*
* Seq_ops show method. Called several times within a read()
* call from userspace, with ddebug_lock held. Formats the
@ -887,6 +1127,7 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
struct ddebug_iter *iter = m->private;
struct _ddebug *dp = p;
struct flagsbuf flags;
char const *class;
if (p == SEQ_START_TOKEN) {
seq_puts(m,
@ -898,8 +1139,17 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
trim_prefix(dp->filename), dp->lineno,
iter->table->mod_name, dp->function,
ddebug_describe_flags(dp->flags, &flags));
seq_escape(m, dp->format, "\t\r\n\"");
seq_puts(m, "\"\n");
seq_escape_str(m, dp->format, ESCAPE_SPACE, "\t\r\n\"");
seq_puts(m, "\"");
if (dp->class_id != _DPRINTK_CLASS_DFLT) {
class = ddebug_class_name(iter, dp);
if (class)
seq_printf(m, " class:%s", class);
else
seq_printf(m, " class unknown, _id:%d", dp->class_id);
}
seq_puts(m, "\n");
return 0;
}
@ -943,18 +1193,50 @@ static const struct proc_ops proc_fops = {
.proc_write = ddebug_proc_write
};
static void ddebug_attach_module_classes(struct ddebug_table *dt,
struct ddebug_class_map *classes,
int num_classes)
{
struct ddebug_class_map *cm;
int i, j, ct = 0;
for (cm = classes, i = 0; i < num_classes; i++, cm++) {
if (!strcmp(cm->mod_name, dt->mod_name)) {
v2pr_info("class[%d]: module:%s base:%d len:%d ty:%d\n", i,
cm->mod_name, cm->base, cm->length, cm->map_type);
for (j = 0; j < cm->length; j++)
v3pr_info(" %d: %d %s\n", j + cm->base, j,
cm->class_names[j]);
list_add(&cm->link, &dt->maps);
ct++;
}
}
if (ct)
vpr_info("module:%s attached %d classes\n", dt->mod_name, ct);
}
/*
* Allocate a new ddebug_table for the given module
* and add it to the global list.
*/
int ddebug_add_module(struct _ddebug *tab, unsigned int n,
const char *name)
static int __ddebug_add_module(struct _ddebug_info *di, unsigned int base,
const char *modname)
{
struct ddebug_table *dt;
v3pr_info("add-module: %s.%d sites\n", modname, di->num_descs);
if (!di->num_descs) {
v3pr_info(" skip %s\n", modname);
return 0;
}
dt = kzalloc(sizeof(*dt), GFP_KERNEL);
if (dt == NULL) {
pr_err("error adding module: %s\n", name);
pr_err("error adding module: %s\n", modname);
return -ENOMEM;
}
/*
@ -963,18 +1245,29 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n,
* member of struct module, which lives at least as long as
* this struct ddebug_table.
*/
dt->mod_name = name;
dt->num_ddebugs = n;
dt->ddebugs = tab;
dt->mod_name = modname;
dt->ddebugs = di->descs;
dt->num_ddebugs = di->num_descs;
INIT_LIST_HEAD(&dt->link);
INIT_LIST_HEAD(&dt->maps);
if (di->classes && di->num_classes)
ddebug_attach_module_classes(dt, di->classes, di->num_classes);
mutex_lock(&ddebug_lock);
list_add(&dt->link, &ddebug_tables);
list_add_tail(&dt->link, &ddebug_tables);
mutex_unlock(&ddebug_lock);
vpr_info("%3u debug prints in module %s\n", n, dt->mod_name);
vpr_info("%3u debug prints in module %s\n", di->num_descs, modname);
return 0;
}
int ddebug_add_module(struct _ddebug_info *di, const char *modname)
{
return __ddebug_add_module(di, 0, modname);
}
/* helper for ddebug_dyndbg_(boot|module)_param_cb */
static int ddebug_dyndbg_param_cb(char *param, char *val,
const char *modname, int on_err)
@ -1083,11 +1376,17 @@ static int __init dynamic_debug_init_control(void)
static int __init dynamic_debug_init(void)
{
struct _ddebug *iter, *iter_start;
const char *modname = NULL;
struct _ddebug *iter, *iter_mod_start;
int ret, i, mod_sites, mod_ct;
const char *modname;
char *cmdline;
int ret = 0;
int n = 0, entries = 0, modct = 0;
struct _ddebug_info di = {
.descs = __start___dyndbg,
.classes = __start___dyndbg_classes,
.num_descs = __stop___dyndbg - __start___dyndbg,
.num_classes = __stop___dyndbg_classes - __start___dyndbg_classes,
};
if (&__start___dyndbg == &__stop___dyndbg) {
if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) {
@ -1098,30 +1397,39 @@ static int __init dynamic_debug_init(void)
ddebug_init_success = 1;
return 0;
}
iter = __start___dyndbg;
iter = iter_mod_start = __start___dyndbg;
modname = iter->modname;
iter_start = iter;
for (; iter < __stop___dyndbg; iter++) {
entries++;
i = mod_sites = mod_ct = 0;
for (; iter < __stop___dyndbg; iter++, i++, mod_sites++) {
if (strcmp(modname, iter->modname)) {
modct++;
ret = ddebug_add_module(iter_start, n, modname);
mod_ct++;
di.num_descs = mod_sites;
di.descs = iter_mod_start;
ret = __ddebug_add_module(&di, i - mod_sites, modname);
if (ret)
goto out_err;
n = 0;
mod_sites = 0;
modname = iter->modname;
iter_start = iter;
iter_mod_start = iter;
}
n++;
}
ret = ddebug_add_module(iter_start, n, modname);
di.num_descs = mod_sites;
di.descs = iter_mod_start;
ret = __ddebug_add_module(&di, i - mod_sites, modname);
if (ret)
goto out_err;
ddebug_init_success = 1;
vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d kiB in __dyndbg section\n",
entries, modct, (int)((modct * sizeof(struct ddebug_table)) >> 10),
(int)((entries * sizeof(struct _ddebug)) >> 10));
i, mod_ct, (int)((mod_ct * sizeof(struct ddebug_table)) >> 10),
(int)((i * sizeof(struct _ddebug)) >> 10));
if (di.num_classes)
v2pr_info(" %d builtin ddebug class-maps\n", di.num_classes);
/* now that ddebug tables are loaded, process all boot args
* again to find and activate queries given in dyndbg params.

165
lib/test_dynamic_debug.c Normal file
View File

@ -0,0 +1,165 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel module for testing dynamic_debug
*
* Authors:
* Jim Cromie <jim.cromie@gmail.com>
*/
#define pr_fmt(fmt) "test_dd: " fmt
#include <linux/module.h>
/* run tests by reading or writing sysfs node: do_prints */
static void do_prints(void); /* device under test */
static int param_set_do_prints(const char *instr, const struct kernel_param *kp)
{
do_prints();
return 0;
}
static int param_get_do_prints(char *buffer, const struct kernel_param *kp)
{
do_prints();
return scnprintf(buffer, PAGE_SIZE, "did do_prints\n");
}
static const struct kernel_param_ops param_ops_do_prints = {
.set = param_set_do_prints,
.get = param_get_do_prints,
};
module_param_cb(do_prints, &param_ops_do_prints, NULL, 0600);
/*
* Using the CLASSMAP api:
* - classmaps must have corresponding enum
* - enum symbols must match/correlate with class-name strings in the map.
* - base must equal enum's 1st value
* - multiple maps must set their base to share the 0-30 class_id space !!
* (build-bug-on tips welcome)
* Additionally, here:
* - tie together sysname, mapname, bitsname, flagsname
*/
#define DD_SYS_WRAP(_model, _flags) \
static unsigned long bits_##_model; \
static struct ddebug_class_param _flags##_model = { \
.bits = &bits_##_model, \
.flags = #_flags, \
.map = &map_##_model, \
}; \
module_param_cb(_flags##_##_model, &param_ops_dyndbg_classes, &_flags##_model, 0600)
/* numeric input, independent bits */
enum cat_disjoint_bits {
D2_CORE = 0,
D2_DRIVER,
D2_KMS,
D2_PRIME,
D2_ATOMIC,
D2_VBL,
D2_STATE,
D2_LEASE,
D2_DP,
D2_DRMRES };
DECLARE_DYNDBG_CLASSMAP(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"D2_CORE",
"D2_DRIVER",
"D2_KMS",
"D2_PRIME",
"D2_ATOMIC",
"D2_VBL",
"D2_STATE",
"D2_LEASE",
"D2_DP",
"D2_DRMRES");
DD_SYS_WRAP(disjoint_bits, p);
DD_SYS_WRAP(disjoint_bits, T);
/* symbolic input, independent bits */
enum cat_disjoint_names { LOW = 11, MID, HI };
DECLARE_DYNDBG_CLASSMAP(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10,
"LOW", "MID", "HI");
DD_SYS_WRAP(disjoint_names, p);
DD_SYS_WRAP(disjoint_names, T);
/* numeric verbosity, V2 > V1 related */
enum cat_level_num { V0 = 14, V1, V2, V3, V4, V5, V6, V7 };
DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,
"V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7");
DD_SYS_WRAP(level_num, p);
DD_SYS_WRAP(level_num, T);
/* symbolic verbosity */
enum cat_level_names { L0 = 22, L1, L2, L3, L4, L5, L6, L7 };
DECLARE_DYNDBG_CLASSMAP(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22,
"L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7");
DD_SYS_WRAP(level_names, p);
DD_SYS_WRAP(level_names, T);
/* stand-in for all pr_debug etc */
#define prdbg(SYM) __pr_debug_cls(SYM, #SYM " msg\n")
static void do_cats(void)
{
pr_debug("doing categories\n");
prdbg(LOW);
prdbg(MID);
prdbg(HI);
prdbg(D2_CORE);
prdbg(D2_DRIVER);
prdbg(D2_KMS);
prdbg(D2_PRIME);
prdbg(D2_ATOMIC);
prdbg(D2_VBL);
prdbg(D2_STATE);
prdbg(D2_LEASE);
prdbg(D2_DP);
prdbg(D2_DRMRES);
}
static void do_levels(void)
{
pr_debug("doing levels\n");
prdbg(V1);
prdbg(V2);
prdbg(V3);
prdbg(V4);
prdbg(V5);
prdbg(V6);
prdbg(V7);
prdbg(L1);
prdbg(L2);
prdbg(L3);
prdbg(L4);
prdbg(L5);
prdbg(L6);
prdbg(L7);
}
static void do_prints(void)
{
do_cats();
do_levels();
}
static int __init test_dynamic_debug_init(void)
{
pr_debug("init start\n");
do_prints();
pr_debug("init done\n");
return 0;
}
static void __exit test_dynamic_debug_exit(void)
{
pr_debug("exited\n");
}
module_init(test_dynamic_debug_init);
module_exit(test_dynamic_debug_exit);
MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
MODULE_LICENSE("GPL");

1
net/bluetooth/rfcomm/tty.c
View File

@ -35,7 +35,6 @@
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/rfcomm.h>
#define RFCOMM_TTY_MAGIC 0x6d02 /* magic number for rfcomm struct */
#define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
#define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */
#define RFCOMM_TTY_MINOR 0