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| author | Michael Kelley <mhkelley@outlook.com> | 2018-03-04 22:17:18 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-06 09:57:17 -0800 |
| commit | 248e742a396e7f00b283f1c56e14b1bef6e3ec56 (patch) | |
| tree | 7c4976f72e563b771ac6b53094cab1e91fe3849c /arch/x86/include/asm | |
| parent | ce767047b1b731a1899a528338644f2bfdab8b36 (diff) | |
| download | linux-0-day-248e742a396e7f00b283f1c56e14b1bef6e3ec56.tar.gz linux-0-day-248e742a396e7f00b283f1c56e14b1bef6e3ec56.tar.xz | |
Drivers: hv: vmbus: Implement Direct Mode for stimer0
The 2016 version of Hyper-V offers the option to operate the guest VM
per-vcpu stimer's in Direct Mode, which means the timer interupts on its
own vector rather than queueing a VMbus message. Direct Mode reduces
timer processing overhead in both the hypervisor and the guest, and
avoids having timer interrupts pollute the VMbus interrupt stream for
the synthetic NIC and storage. This patch enables Direct Mode by
default on stimer0 when running on a version of Hyper-V that supports
it.
In prep for coming support of Hyper-V on ARM64, the arch independent
portion of the code contains calls to routines that will be populated
on ARM64 but are not needed and do nothing on x86.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/hardirq.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/irq_vectors.h | 3 | ||||
| -rw-r--r-- | arch/x86/include/asm/mshyperv.h | 13 |
3 files changed, 16 insertions, 1 deletions
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h index 7c341a74ec8c4..5ea2afd4c8719 100644 --- a/arch/x86/include/asm/hardirq.h +++ b/arch/x86/include/asm/hardirq.h @@ -40,6 +40,7 @@ typedef struct { #endif #if IS_ENABLED(CONFIG_HYPERV) unsigned int irq_hv_reenlightenment_count; + unsigned int hyperv_stimer0_count; #endif } ____cacheline_aligned irq_cpustat_t; diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h index e71c1120426bb..404c5fdff859d 100644 --- a/arch/x86/include/asm/irq_vectors.h +++ b/arch/x86/include/asm/irq_vectors.h @@ -106,9 +106,10 @@ #if IS_ENABLED(CONFIG_HYPERV) #define HYPERV_REENLIGHTENMENT_VECTOR 0xee +#define HYPERV_STIMER0_VECTOR 0xed #endif -#define LOCAL_TIMER_VECTOR 0xed +#define LOCAL_TIMER_VECTOR 0xec #define NR_VECTORS 256 diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 25283f7eb299e..e73c4d0c06ada 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -173,6 +173,19 @@ void hv_remove_kexec_handler(void); void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)); void hv_remove_crash_handler(void); +/* + * Routines for stimer0 Direct Mode handling. + * On x86/x64, there are no percpu actions to take. + */ +void hv_stimer0_vector_handler(struct pt_regs *regs); +void hv_stimer0_callback_vector(void); +int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void)); +void hv_remove_stimer0_irq(int irq); + +static inline void hv_enable_stimer0_percpu_irq(int irq) {} +static inline void hv_disable_stimer0_percpu_irq(int irq) {} + + #if IS_ENABLED(CONFIG_HYPERV) extern struct clocksource *hyperv_cs; extern void *hv_hypercall_pg; |