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asm-generic/hyperv: provide cpumask_to_vpset_noself

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This is a new variant which removes `self' cpu from the vpset. It will
be used in Hyper-V enlightened IPI code.

Signed-off-by: Wei Liu <wei.liu@kernel.org>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20210910185714.299411-2-wei.liu@kernel.org
This commit is contained in:
Wei Liu 2021-09-10 18:57:13 +00:00
parent f1940d4e9c
commit 7ad9bb9d0f
1 changed files with 19 additions and 2 deletions
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21
include/asm-generic/mshyperv.h
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@ -184,10 +184,12 @@ static inline int hv_cpu_number_to_vp_number(int cpu_number)
return hv_vp_index[cpu_number]; return hv_vp_index[cpu_number];
} }
static inline int cpumask_to_vpset(struct hv_vpset *vpset, static inline int __cpumask_to_vpset(struct hv_vpset *vpset,
const struct cpumask *cpus) const struct cpumask *cpus,
bool exclude_self)
{ {
int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1; int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1;
int this_cpu = smp_processor_id();
/* valid_bank_mask can represent up to 64 banks */ /* valid_bank_mask can represent up to 64 banks */
if (hv_max_vp_index / 64 >= 64) if (hv_max_vp_index / 64 >= 64)
@ -205,6 +207,8 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset,
* Some banks may end up being empty but this is acceptable. * Some banks may end up being empty but this is acceptable.
*/ */
for_each_cpu(cpu, cpus) { for_each_cpu(cpu, cpus) {
if (exclude_self && cpu == this_cpu)
continue;
vcpu = hv_cpu_number_to_vp_number(cpu); vcpu = hv_cpu_number_to_vp_number(cpu);
if (vcpu == VP_INVAL) if (vcpu == VP_INVAL)
return -1; return -1;
@ -219,6 +223,19 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset,
return nr_bank; return nr_bank;
} }
static inline int cpumask_to_vpset(struct hv_vpset *vpset,
const struct cpumask *cpus)
{
return __cpumask_to_vpset(vpset, cpus, false);
}
static inline int cpumask_to_vpset_noself(struct hv_vpset *vpset,
const struct cpumask *cpus)
{
WARN_ON_ONCE(preemptible());
return __cpumask_to_vpset(vpset, cpus, true);
}
void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die); void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die);
bool hv_is_hyperv_initialized(void); bool hv_is_hyperv_initialized(void);
bool hv_is_hibernation_supported(void); bool hv_is_hibernation_supported(void);