Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-15 15:41:58 +00:00
Code Issues Packages Projects Releases Wiki Activity
f382a086f3
linux/drivers/pci/hotplug/sgi_hotplug.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

731 lines
18 KiB
C
Raw Blame History

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved.
*
* This work was based on the 2.4/2.6 kernel development by Dick Reigner.
* Work to add BIOS PROM support was completed by Mike Habeck.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <asm/sn/addrs.h>
#include <asm/sn/geo.h>
#include <asm/sn/l1.h>
#include <asm/sn/module.h>
#include <asm/sn/pcibr_provider.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/sn_feature_sets.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/types.h>
#include <linux/acpi.h>
#include <asm/sn/acpi.h>
#include "../pci.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
/* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */
#define PCI_SLOT_ALREADY_UP 2 /* slot already up */
#define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
#define PCI_L1_ERR 7 /* L1 console command error */
#define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
#define PCIIO_ASIC_TYPE_TIOCA 4
#define PCI_L1_QSIZE 128 /* our L1 message buffer size */
#define SN_MAX_HP_SLOTS 32 /* max hotplug slots */
#define SN_SLOT_NAME_SIZE 33 /* size of name string */
/* internal list head */
static struct list_head sn_hp_list;
/* hotplug_slot struct's private pointer */
struct slot {
int device_num;
struct pci_bus *pci_bus;
/* this struct for glue internal only */
struct hotplug_slot *hotplug_slot;
struct list_head hp_list;
char physical_path[SN_SLOT_NAME_SIZE];
};
struct pcibr_slot_enable_resp {
int resp_sub_errno;
char resp_l1_msg[PCI_L1_QSIZE + 1];
};
struct pcibr_slot_disable_resp {
int resp_sub_errno;
char resp_l1_msg[PCI_L1_QSIZE + 1];
};
enum sn_pci_req_e {
PCI_REQ_SLOT_ELIGIBLE,
PCI_REQ_SLOT_DISABLE
};
static int enable_slot(struct hotplug_slot *slot);
static int disable_slot(struct hotplug_slot *slot);
static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
static struct hotplug_slot_ops sn_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.get_power_status = get_power_status,
};
static DEFINE_MUTEX(sn_hotplug_mutex);
static ssize_t path_show(struct pci_slot *pci_slot, char *buf)
{
int retval = -ENOENT;
struct slot *slot = pci_slot->hotplug->private;
if (!slot)
return retval;
retval = sprintf (buf, "%s\n", slot->physical_path);
return retval;
}
static struct pci_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
{
struct pcibus_info *pcibus_info;
u16 busnum, segment, ioboard_type;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
/* Check to see if this is a valid slot on 'pci_bus' */
if (!(pcibus_info->pbi_valid_devices & (1 << device)))
return -EPERM;
ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
busnum = pcibus_info->pbi_buscommon.bs_persist_busnum;
segment = pci_domain_nr(pci_bus) & 0xf;
/* Do not allow hotplug operations on base I/O cards */
if ((ioboard_type == L1_BRICKTYPE_IX ||
ioboard_type == L1_BRICKTYPE_IA) &&
(segment == 1 && busnum == 0 && device != 1))
return -EPERM;
return 1;
}
static int sn_pci_bus_valid(struct pci_bus *pci_bus)
{
struct pcibus_info *pcibus_info;
u32 asic_type;
u16 ioboard_type;
/* Don't register slots hanging off the TIOCA bus */
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
return -EPERM;
/* Only register slots in I/O Bricks that support hotplug */
ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
switch (ioboard_type) {
case L1_BRICKTYPE_IX:
case L1_BRICKTYPE_PX:
case L1_BRICKTYPE_IA:
case L1_BRICKTYPE_PA:
case L1_BOARDTYPE_PCIX3SLOT:
return 1;
break;
default:
return -EPERM;
break;
}
return -EIO;
}
static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
struct pci_bus *pci_bus, int device,
char *name)
{
struct pcibus_info *pcibus_info;
struct slot *slot;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot)
return -ENOMEM;
bss_hotplug_slot->private = slot;
slot->device_num = device;
slot->pci_bus = pci_bus;
sprintf(name, "%04x:%02x:%02x",
pci_domain_nr(pci_bus),
((u16)pcibus_info->pbi_buscommon.bs_persist_busnum),
device + 1);
sn_generate_path(pci_bus, slot->physical_path);
slot->hotplug_slot = bss_hotplug_slot;
list_add(&slot->hp_list, &sn_hp_list);
return 0;
}
static struct hotplug_slot * sn_hp_destroy(void)
{
struct slot *slot;
struct pci_slot *pci_slot;
struct hotplug_slot *bss_hotplug_slot = NULL;
list_for_each_entry(slot, &sn_hp_list, hp_list) {
bss_hotplug_slot = slot->hotplug_slot;
pci_slot = bss_hotplug_slot->pci_slot;
list_del(&((struct slot *)bss_hotplug_slot->private)->
hp_list);
sysfs_remove_file(&pci_slot->kobj,
&sn_slot_path_attr.attr);
break;
}
return bss_hotplug_slot;
}
static void sn_bus_free_data(struct pci_dev *dev)
{
struct pci_bus *subordinate_bus;
struct pci_dev *child;
/* Recursively clean up sn_irq_info structs */
if (dev->subordinate) {
subordinate_bus = dev->subordinate;
list_for_each_entry(child, &subordinate_bus->devices, bus_list)
sn_bus_free_data(child);
}
/*
* Some drivers may use dma accesses during the
* driver remove function. We release the sysdata
* areas after the driver remove functions have
* been called.
*/
sn_bus_store_sysdata(dev);
sn_pci_unfixup_slot(dev);
}
static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
int device_num, char **ssdt)
{
struct slot *slot = bss_hotplug_slot->private;
struct pcibus_info *pcibus_info;
struct pcibr_slot_enable_resp resp;
int rc;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
/*
* Power-on and initialize the slot in the SN
* PCI infrastructure.
*/
rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt);
if (rc == PCI_SLOT_ALREADY_UP) {
dev_dbg(&slot->pci_bus->self->dev, "is already active\n");
return 1; /* return 1 to user */
}
if (rc == PCI_L1_ERR) {
dev_dbg(&slot->pci_bus->self->dev,
"L1 failure %d with message: %s",
resp.resp_sub_errno, resp.resp_l1_msg);
return -EPERM;
}
if (rc) {
dev_dbg(&slot->pci_bus->self->dev,
"insert failed with error %d sub-error %d\n",
rc, resp.resp_sub_errno);
return -EIO;
}
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
pcibus_info->pbi_enabled_devices |= (1 << device_num);
return 0;
}
static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
int device_num, int action)
{
struct slot *slot = bss_hotplug_slot->private;
struct pcibus_info *pcibus_info;
struct pcibr_slot_disable_resp resp;
int rc;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
(rc == PCI_SLOT_ALREADY_DOWN)) {
dev_dbg(&slot->pci_bus->self->dev, "Slot %s already inactive\n", slot->physical_path);
return 1; /* return 1 to user */
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
dev_dbg(&slot->pci_bus->self->dev,
"Cannot remove last 33MHz card\n");
return -EPERM;
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
dev_dbg(&slot->pci_bus->self->dev,
"L1 failure %d with message \n%s\n",
resp.resp_sub_errno, resp.resp_l1_msg);
return -EPERM;
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
dev_dbg(&slot->pci_bus->self->dev,
"remove failed with error %d sub-error %d\n",
rc, resp.resp_sub_errno);
return -EIO;
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
return 0;
if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
dev_dbg(&slot->pci_bus->self->dev, "remove successful\n");
return 0;
}
if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
dev_dbg(&slot->pci_bus->self->dev,"remove failed rc = %d\n", rc);
}
return rc;
}
/*
* Power up and configure the slot via a SAL call to PROM.
* Scan slot (and any children), do any platform specific fixup,
* and find device driver.
*/
static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
{
struct slot *slot = bss_hotplug_slot->private;
struct pci_bus *new_bus = NULL;
struct pci_dev *dev;
int func, num_funcs;
int new_ppb = 0;
int rc;
char *ssdt = NULL;
void pcibios_fixup_device_resources(struct pci_dev *);
/* Serialize the Linux PCI infrastructure */
mutex_lock(&sn_hotplug_mutex);
/*
* Power-on and initialize the slot in the SN
* PCI infrastructure. Also, retrieve the ACPI SSDT
* table for the slot (if ACPI capable PROM).
*/
rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt);
if (rc) {
mutex_unlock(&sn_hotplug_mutex);
return rc;
}
if (ssdt)
ssdt = __va(ssdt);
/* Add the new SSDT for the slot to the ACPI namespace */
if (SN_ACPI_BASE_SUPPORT() && ssdt) {
acpi_status ret;
ret = acpi_load_table((struct acpi_table_header *)ssdt);
if (ACPI_FAILURE(ret)) {
printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n",
__func__, ret);
/* try to continue on */
}
}
num_funcs = pci_scan_slot(slot->pci_bus,
PCI_DEVFN(slot->device_num + 1, 0));
if (!num_funcs) {
dev_dbg(&slot->pci_bus->self->dev, "no device in slot\n");
mutex_unlock(&sn_hotplug_mutex);
return -ENODEV;
}
/*
* Map SN resources for all functions on the card
* to the Linux PCI interface and tell the drivers
* about them.
*/
for (func = 0; func < num_funcs; func++) {
dev = pci_get_slot(slot->pci_bus,
PCI_DEVFN(slot->device_num + 1,
PCI_FUNC(func)));
if (dev) {
/* Need to do slot fixup on PPB before fixup of children
* (PPB's pcidev_info needs to be in pcidev_info list
* before child's SN_PCIDEV_INFO() call to setup
* pdi_host_pcidev_info).
*/
pcibios_fixup_device_resources(dev);
if (SN_ACPI_BASE_SUPPORT())
sn_acpi_slot_fixup(dev);
else
sn_io_slot_fixup(dev);
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
unsigned char sec_bus;
pci_read_config_byte(dev, PCI_SECONDARY_BUS,
&sec_bus);
new_bus = pci_add_new_bus(dev->bus, dev,
sec_bus);
pci_scan_child_bus(new_bus);
new_ppb = 1;
}
pci_dev_put(dev);
}
}
/*
* Add the slot's devices to the ACPI infrastructure */
if (SN_ACPI_BASE_SUPPORT() && ssdt) {
unsigned long long adr;
struct acpi_device *pdevice;
struct acpi_device *device;
acpi_handle phandle;
acpi_handle chandle = NULL;
acpi_handle rethandle;
acpi_status ret;
phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
if (acpi_bus_get_device(phandle, &pdevice)) {
dev_dbg(&slot->pci_bus->self->dev,
"no parent device, assuming NULL\n");
pdevice = NULL;
}
/*
* Walk the rootbus node's immediate children looking for
* the slot's device node(s). There can be more than
* one for multifunction devices.
*/
for (;;) {
rethandle = NULL;
ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
phandle, chandle,
&rethandle);
if (ret == AE_NOT_FOUND || rethandle == NULL)
break;
chandle = rethandle;
ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
NULL, &adr);
if (ACPI_SUCCESS(ret) &&
(adr>>16) == (slot->device_num + 1)) {
ret = acpi_bus_add(&device, pdevice, chandle,
ACPI_BUS_TYPE_DEVICE);
if (ACPI_FAILURE(ret)) {
printk(KERN_ERR "%s: acpi_bus_add "
"failed (0x%x) for slot %d "
"func %d\n", __func__,
ret, (int)(adr>>16),
(int)(adr&0xffff));
/* try to continue on */
} else {
acpi_bus_start(device);
}
}
}
}
/* Call the driver for the new device */
pci_bus_add_devices(slot->pci_bus);
/* Call the drivers for the new devices subordinate to PPB */
if (new_ppb)
pci_bus_add_devices(new_bus);
mutex_unlock(&sn_hotplug_mutex);
if (rc == 0)
dev_dbg(&slot->pci_bus->self->dev,
"insert operation successful\n");
else
dev_dbg(&slot->pci_bus->self->dev,
"insert operation failed rc = %d\n", rc);
return rc;
}
static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
{
struct slot *slot = bss_hotplug_slot->private;
struct pci_dev *dev;
int func;
int rc;
acpi_owner_id ssdt_id = 0;
/* Acquire update access to the bus */
mutex_lock(&sn_hotplug_mutex);
/* is it okay to bring this slot down? */
rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
PCI_REQ_SLOT_ELIGIBLE);
if (rc)
goto leaving;
/* free the ACPI resources for the slot */
if (SN_ACPI_BASE_SUPPORT() &&
PCI_CONTROLLER(slot->pci_bus)->acpi_handle) {
unsigned long long adr;
struct acpi_device *device;
acpi_handle phandle;
acpi_handle chandle = NULL;
acpi_handle rethandle;
acpi_status ret;
/* Get the rootbus node pointer */
phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
/*
* Walk the rootbus node's immediate children looking for
* the slot's device node(s). There can be more than
* one for multifunction devices.
*/
for (;;) {
rethandle = NULL;
ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
phandle, chandle,
&rethandle);
if (ret == AE_NOT_FOUND || rethandle == NULL)
break;
chandle = rethandle;
ret = acpi_evaluate_integer(chandle,
METHOD_NAME__ADR,
NULL, &adr);
if (ACPI_SUCCESS(ret) &&
(adr>>16) == (slot->device_num + 1)) {
/* retain the owner id */
acpi_get_id(chandle, &ssdt_id);
ret = acpi_bus_get_device(chandle,
&device);
if (ACPI_SUCCESS(ret))
acpi_bus_trim(device, 1);
}
}
}
/* Free the SN resources assigned to the Linux device.*/
for (func = 0; func < 8; func++) {
dev = pci_get_slot(slot->pci_bus,
PCI_DEVFN(slot->device_num + 1,
PCI_FUNC(func)));
if (dev) {
sn_bus_free_data(dev);
pci_remove_bus_device(dev);
pci_dev_put(dev);
}
}
/* Remove the SSDT for the slot from the ACPI namespace */
if (SN_ACPI_BASE_SUPPORT() && ssdt_id) {
acpi_status ret;
ret = acpi_unload_table_id(ssdt_id);
if (ACPI_FAILURE(ret)) {
printk(KERN_ERR "%s: acpi_unload_table_id "
"failed (0x%x) for id %d\n",
__func__, ret, ssdt_id);
/* try to continue on */
}
}
/* free the collected sysdata pointers */
sn_bus_free_sysdata();
/* Deactivate slot */
rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
PCI_REQ_SLOT_DISABLE);
leaving:
/* Release the bus lock */
mutex_unlock(&sn_hotplug_mutex);
return rc;
}
static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
u8 *value)
{
struct slot *slot = bss_hotplug_slot->private;
struct pcibus_info *pcibus_info;
u32 power;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
mutex_lock(&sn_hotplug_mutex);
power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
*value = power ? 1 : 0;
mutex_unlock(&sn_hotplug_mutex);
return 0;
}
static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
{
kfree(bss_hotplug_slot->info);
kfree(bss_hotplug_slot->private);
kfree(bss_hotplug_slot);
}
static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
{
int device;
struct pci_slot *pci_slot;
struct hotplug_slot *bss_hotplug_slot;
char name[SN_SLOT_NAME_SIZE];
int rc = 0;
/*
* Currently only four devices are supported,
* in the future there maybe more -- up to 32.
*/
for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
if (sn_pci_slot_valid(pci_bus, device) != 1)
continue;
bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
GFP_KERNEL);
if (!bss_hotplug_slot) {
rc = -ENOMEM;
goto alloc_err;
}
bss_hotplug_slot->info =
kzalloc(sizeof(struct hotplug_slot_info),
GFP_KERNEL);
if (!bss_hotplug_slot->info) {
rc = -ENOMEM;
goto alloc_err;
}
if (sn_hp_slot_private_alloc(bss_hotplug_slot,
pci_bus, device, name)) {
rc = -ENOMEM;
goto alloc_err;
}
bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
bss_hotplug_slot->release = &sn_release_slot;
rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name);
if (rc)
goto register_err;
pci_slot = bss_hotplug_slot->pci_slot;
rc = sysfs_create_file(&pci_slot->kobj,
&sn_slot_path_attr.attr);
if (rc)
goto register_err;
}
dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n");
return rc;
register_err:
dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n",
rc);
alloc_err:
if (rc == -ENOMEM)
dev_dbg(&pci_bus->self->dev, "Memory allocation error\n");
/* destroy THIS element */
if (bss_hotplug_slot)
sn_release_slot(bss_hotplug_slot);
/* destroy anything else on the list */
while ((bss_hotplug_slot = sn_hp_destroy()))
pci_hp_deregister(bss_hotplug_slot);
return rc;
}
static int __init sn_pci_hotplug_init(void)
{
struct pci_bus *pci_bus = NULL;
int rc;
int registered = 0;
if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
__func__);
return -EPERM;
}
INIT_LIST_HEAD(&sn_hp_list);
while ((pci_bus = pci_find_next_bus(pci_bus))) {
if (!pci_bus->sysdata)
continue;
rc = sn_pci_bus_valid(pci_bus);
if (rc != 1) {
dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n");
continue;
}
dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n");
rc = sn_hotplug_slot_register(pci_bus);
if (!rc) {
registered = 1;
} else {
registered = 0;
break;
}
}
return registered == 1 ? 0 : -ENODEV;
}
static void __exit sn_pci_hotplug_exit(void)
{
struct hotplug_slot *bss_hotplug_slot;
while ((bss_hotplug_slot = sn_hp_destroy()))
pci_hp_deregister(bss_hotplug_slot);
if (!list_empty(&sn_hp_list))
printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
}
module_init(sn_pci_hotplug_init);
module_exit(sn_pci_hotplug_exit);
Reference in New Issue View Git Blame Copy Permalink