forked from Minki/linux
f4dd029ee0
Here is the "big" char/misc driver patchset for 4.13-rc1. Lots of stuff in here, a large thunderbolt update, w1 driver header reorg, the new mux driver subsystem, google firmware driver updates, and a raft of other smaller things. Full details in the shortlog. All of these have been in linux-next for a while with the only reported issue being a merge problem with this tree and the jc-docs tree in the w1 documentation area. The fix should be obvious for what to do when it happens, if not, we can send a follow-up patch for it afterward. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- iG0EABECAC0WIQT0tgzFv3jCIUoxPcsxR9QN2y37KQUCWVpXKA8cZ3JlZ0Brcm9h aC5jb20ACgkQMUfUDdst+ynLrQCdG9SxRjAbOd6pT9Fr2NAzpUG84YsAoLw+I3iO EMi60UXWqAFJbtVMS9Aj =yrSq -----END PGP SIGNATURE----- Merge tag 'char-misc-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc updates from Greg KH: "Here is the "big" char/misc driver patchset for 4.13-rc1. Lots of stuff in here, a large thunderbolt update, w1 driver header reorg, the new mux driver subsystem, google firmware driver updates, and a raft of other smaller things. Full details in the shortlog. All of these have been in linux-next for a while with the only reported issue being a merge problem with this tree and the jc-docs tree in the w1 documentation area" * tag 'char-misc-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (147 commits) misc: apds990x: Use sysfs_match_string() helper mei: drop unreachable code in mei_start mei: validate the message header only in first fragment. DocBook: w1: Update W1 file locations and names in DocBook mux: adg792a: always require I2C support nvmem: rockchip-efuse: add support for rk322x-efuse nvmem: core: add locking to nvmem_find_cell nvmem: core: Call put_device() in nvmem_unregister() nvmem: core: fix leaks on registration errors nvmem: correct Broadcom OTP controller driver writes w1: Add subsystem kernel public interface drivers/fsi: Add module license to core driver drivers/fsi: Use asynchronous slave mode drivers/fsi: Add hub master support drivers/fsi: Add SCOM FSI client device driver drivers/fsi/gpio: Add tracepoints for GPIO master drivers/fsi: Add GPIO based FSI master drivers/fsi: Document FSI master sysfs files in ABI drivers/fsi: Add error handling for slave drivers/fsi: Add tracepoints for low-level operations ...
232 lines
6.4 KiB
C
232 lines
6.4 KiB
C
#ifndef _ASM_X86_MSHYPER_H
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#define _ASM_X86_MSHYPER_H
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#include <linux/types.h>
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#include <linux/atomic.h>
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#include <asm/hyperv.h>
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/*
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* The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
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* is set by CPUID(HVCPUID_VERSION_FEATURES).
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*/
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enum hv_cpuid_function {
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HVCPUID_VERSION_FEATURES = 0x00000001,
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HVCPUID_VENDOR_MAXFUNCTION = 0x40000000,
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HVCPUID_INTERFACE = 0x40000001,
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/*
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* The remaining functions depend on the value of
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* HVCPUID_INTERFACE
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*/
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HVCPUID_VERSION = 0x40000002,
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HVCPUID_FEATURES = 0x40000003,
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HVCPUID_ENLIGHTENMENT_INFO = 0x40000004,
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HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005,
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};
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struct ms_hyperv_info {
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u32 features;
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u32 misc_features;
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u32 hints;
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};
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extern struct ms_hyperv_info ms_hyperv;
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/*
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* Declare the MSR used to setup pages used to communicate with the hypervisor.
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*/
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union hv_x64_msr_hypercall_contents {
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u64 as_uint64;
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struct {
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u64 enable:1;
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u64 reserved:11;
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u64 guest_physical_address:52;
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};
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};
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/*
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* TSC page layout.
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*/
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struct ms_hyperv_tsc_page {
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volatile u32 tsc_sequence;
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u32 reserved1;
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volatile u64 tsc_scale;
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volatile s64 tsc_offset;
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u64 reserved2[509];
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};
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/*
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* The guest OS needs to register the guest ID with the hypervisor.
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* The guest ID is a 64 bit entity and the structure of this ID is
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* specified in the Hyper-V specification:
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*
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* msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
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*
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* While the current guideline does not specify how Linux guest ID(s)
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* need to be generated, our plan is to publish the guidelines for
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* Linux and other guest operating systems that currently are hosted
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* on Hyper-V. The implementation here conforms to this yet
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* unpublished guidelines.
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*
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*
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* Bit(s)
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* 63 - Indicates if the OS is Open Source or not; 1 is Open Source
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* 62:56 - Os Type; Linux is 0x100
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* 55:48 - Distro specific identification
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* 47:16 - Linux kernel version number
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* 15:0 - Distro specific identification
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*
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*
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*/
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#define HV_LINUX_VENDOR_ID 0x8100
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/*
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* Generate the guest ID based on the guideline described above.
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*/
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static inline __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
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__u64 d_info2)
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{
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__u64 guest_id = 0;
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guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
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guest_id |= (d_info1 << 48);
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guest_id |= (kernel_version << 16);
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guest_id |= d_info2;
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return guest_id;
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}
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/* Free the message slot and signal end-of-message if required */
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static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
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{
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/*
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* On crash we're reading some other CPU's message page and we need
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* to be careful: this other CPU may already had cleared the header
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* and the host may already had delivered some other message there.
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* In case we blindly write msg->header.message_type we're going
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* to lose it. We can still lose a message of the same type but
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* we count on the fact that there can only be one
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* CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
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* on crash.
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*/
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if (cmpxchg(&msg->header.message_type, old_msg_type,
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HVMSG_NONE) != old_msg_type)
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return;
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/*
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* Make sure the write to MessageType (ie set to
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* HVMSG_NONE) happens before we read the
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* MessagePending and EOMing. Otherwise, the EOMing
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* will not deliver any more messages since there is
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* no empty slot
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*/
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mb();
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if (msg->header.message_flags.msg_pending) {
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/*
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* This will cause message queue rescan to
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* possibly deliver another msg from the
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* hypervisor
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*/
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wrmsrl(HV_X64_MSR_EOM, 0);
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}
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}
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#define hv_init_timer(timer, tick) wrmsrl(timer, tick)
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#define hv_init_timer_config(config, val) wrmsrl(config, val)
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#define hv_get_simp(val) rdmsrl(HV_X64_MSR_SIMP, val)
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#define hv_set_simp(val) wrmsrl(HV_X64_MSR_SIMP, val)
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#define hv_get_siefp(val) rdmsrl(HV_X64_MSR_SIEFP, val)
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#define hv_set_siefp(val) wrmsrl(HV_X64_MSR_SIEFP, val)
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#define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
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#define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
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#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
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#define hv_get_synint_state(int_num, val) rdmsrl(int_num, val)
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#define hv_set_synint_state(int_num, val) wrmsrl(int_num, val)
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void hyperv_callback_vector(void);
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#ifdef CONFIG_TRACING
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#define trace_hyperv_callback_vector hyperv_callback_vector
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#endif
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void hyperv_vector_handler(struct pt_regs *regs);
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void hv_setup_vmbus_irq(void (*handler)(void));
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void hv_remove_vmbus_irq(void);
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void hv_setup_kexec_handler(void (*handler)(void));
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void hv_remove_kexec_handler(void);
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void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
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void hv_remove_crash_handler(void);
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#if IS_ENABLED(CONFIG_HYPERV)
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extern struct clocksource *hyperv_cs;
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void hyperv_init(void);
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void hyperv_report_panic(struct pt_regs *regs);
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bool hv_is_hypercall_page_setup(void);
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void hyperv_cleanup(void);
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#endif
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#ifdef CONFIG_HYPERV_TSCPAGE
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struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
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static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
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{
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u64 scale, offset, cur_tsc;
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u32 sequence;
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/*
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* The protocol for reading Hyper-V TSC page is specified in Hypervisor
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* Top-Level Functional Specification ver. 3.0 and above. To get the
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* reference time we must do the following:
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* - READ ReferenceTscSequence
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* A special '0' value indicates the time source is unreliable and we
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* need to use something else. The currently published specification
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* versions (up to 4.0b) contain a mistake and wrongly claim '-1'
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* instead of '0' as the special value, see commit c35b82ef0294.
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* - ReferenceTime =
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* ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
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* - READ ReferenceTscSequence again. In case its value has changed
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* since our first reading we need to discard ReferenceTime and repeat
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* the whole sequence as the hypervisor was updating the page in
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* between.
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*/
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do {
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sequence = READ_ONCE(tsc_pg->tsc_sequence);
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if (!sequence)
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return U64_MAX;
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/*
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* Make sure we read sequence before we read other values from
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* TSC page.
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*/
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smp_rmb();
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scale = READ_ONCE(tsc_pg->tsc_scale);
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offset = READ_ONCE(tsc_pg->tsc_offset);
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cur_tsc = rdtsc_ordered();
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/*
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* Make sure we read sequence after we read all other values
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* from TSC page.
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*/
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smp_rmb();
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} while (READ_ONCE(tsc_pg->tsc_sequence) != sequence);
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return mul_u64_u64_shr(cur_tsc, scale, 64) + offset;
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}
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#else
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static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
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{
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return NULL;
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}
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#endif
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#endif
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