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perf/x86/intel/pt: Export pt_cap_get() 

pt_cap_get() is required by the upcoming PT support in KVM guests.

Export it and move the capabilites enum to a global header.

As a global functions, "pt_*" is already used for ptrace and
other things, so it makes sense to use "intel_pt_*" as a prefix.

Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Chao Peng 2018-10-24 16:05:06 +08:00 committed by Paolo Bonzini
parent 887eda13b5
commit f6d079ce86
3 changed files with 49 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
arch/x86/events/intel/pt.c
View File

@ -75,7 +75,7 @@ static struct pt_cap_desc {
PT_CAP(psb_periods, 1, CPUID_EBX, 0xffff0000),
};
static u32 pt_cap_get(enum pt_capabilities cap)
u32 intel_pt_validate_hw_cap(enum pt_capabilities cap)
{
struct pt_cap_desc *cd = &pt_caps[cap];
u32 c = pt_pmu.caps[cd->leaf * PT_CPUID_REGS_NUM + cd->reg];
@ -83,6 +83,7 @@ static u32 pt_cap_get(enum pt_capabilities cap)
return (c & cd->mask) >> shift;
}
EXPORT_SYMBOL_GPL(intel_pt_validate_hw_cap);
static ssize_t pt_cap_show(struct device *cdev,
struct device_attribute *attr,
@ -92,7 +93,7 @@ static ssize_t pt_cap_show(struct device *cdev,
container_of(attr, struct dev_ext_attribute, attr);
enum pt_capabilities cap = (long)ea->var;
return snprintf(buf, PAGE_SIZE, "%x\n", pt_cap_get(cap));
return snprintf(buf, PAGE_SIZE, "%x\n", intel_pt_validate_hw_cap(cap));
}
static struct attribute_group pt_cap_group __ro_after_init = {
@ -310,16 +311,16 @@ static bool pt_event_valid(struct perf_event *event)
return false;
if (config & RTIT_CTL_CYC_PSB) {
if (!pt_cap_get(PT_CAP_psb_cyc))
if (!intel_pt_validate_hw_cap(PT_CAP_psb_cyc))
return false;
allowed = pt_cap_get(PT_CAP_psb_periods);
allowed = intel_pt_validate_hw_cap(PT_CAP_psb_periods);
requested = (config & RTIT_CTL_PSB_FREQ) >>
RTIT_CTL_PSB_FREQ_OFFSET;
if (requested && (!(allowed & BIT(requested))))
return false;
allowed = pt_cap_get(PT_CAP_cycle_thresholds);
allowed = intel_pt_validate_hw_cap(PT_CAP_cycle_thresholds);
requested = (config & RTIT_CTL_CYC_THRESH) >>
RTIT_CTL_CYC_THRESH_OFFSET;
if (requested && (!(allowed & BIT(requested))))
@ -334,10 +335,10 @@ static bool pt_event_valid(struct perf_event *event)
* Spec says that setting mtc period bits while mtc bit in
* CPUID is 0 will #GP, so better safe than sorry.
*/
if (!pt_cap_get(PT_CAP_mtc))
if (!intel_pt_validate_hw_cap(PT_CAP_mtc))
return false;
allowed = pt_cap_get(PT_CAP_mtc_periods);
allowed = intel_pt_validate_hw_cap(PT_CAP_mtc_periods);
if (!allowed)
return false;
@ -349,11 +350,11 @@ static bool pt_event_valid(struct perf_event *event)
}
if (config & RTIT_CTL_PWR_EVT_EN &&
!pt_cap_get(PT_CAP_power_event_trace))
!intel_pt_validate_hw_cap(PT_CAP_power_event_trace))
return false;
if (config & RTIT_CTL_PTW) {
if (!pt_cap_get(PT_CAP_ptwrite))
if (!intel_pt_validate_hw_cap(PT_CAP_ptwrite))
return false;
/* FUPonPTW without PTW doesn't make sense */
@ -598,7 +599,7 @@ static struct topa *topa_alloc(int cpu, gfp_t gfp)
* In case of singe-entry ToPA, always put the self-referencing END
* link as the 2nd entry in the table
*/
if (!pt_cap_get(PT_CAP_topa_multiple_entries)) {
if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries)) {
TOPA_ENTRY(topa, 1)->base = topa->phys >> TOPA_SHIFT;
TOPA_ENTRY(topa, 1)->end = 1;
}
@ -638,7 +639,7 @@ static void topa_insert_table(struct pt_buffer *buf, struct topa *topa)
topa->offset = last->offset + last->size;
buf->last = topa;
if (!pt_cap_get(PT_CAP_topa_multiple_entries))
if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries))
return;
BUG_ON(last->last != TENTS_PER_PAGE - 1);
@ -654,7 +655,7 @@ static void topa_insert_table(struct pt_buffer *buf, struct topa *topa)
static bool topa_table_full(struct topa *topa)
{
/* single-entry ToPA is a special case */
if (!pt_cap_get(PT_CAP_topa_multiple_entries))
if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries))
return !!topa->last;
return topa->last == TENTS_PER_PAGE - 1;
@ -690,7 +691,8 @@ static int topa_insert_pages(struct pt_buffer *buf, gfp_t gfp)
TOPA_ENTRY(topa, -1)->base = page_to_phys(p) >> TOPA_SHIFT;
TOPA_ENTRY(topa, -1)->size = order;
if (!buf->snapshot && !pt_cap_get(PT_CAP_topa_multiple_entries)) {
if (!buf->snapshot &&
!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries)) {
TOPA_ENTRY(topa, -1)->intr = 1;
TOPA_ENTRY(topa, -1)->stop = 1;
}
@ -725,7 +727,7 @@ static void pt_topa_dump(struct pt_buffer *buf)
topa->table[i].intr ? 'I' : ' ',
topa->table[i].stop ? 'S' : ' ',
*(u64 *)&topa->table[i]);
if ((pt_cap_get(PT_CAP_topa_multiple_entries) &&
if ((intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries) &&
topa->table[i].stop) ||
topa->table[i].end)
break;
@ -828,7 +830,7 @@ static void pt_handle_status(struct pt *pt)
* means we are already losing data; need to let the decoder
* know.
*/
if (!pt_cap_get(PT_CAP_topa_multiple_entries) ||
if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries) ||
buf->output_off == sizes(TOPA_ENTRY(buf->cur, buf->cur_idx)->size)) {
perf_aux_output_flag(&pt->handle,
PERF_AUX_FLAG_TRUNCATED);
@ -840,7 +842,8 @@ static void pt_handle_status(struct pt *pt)
* Also on single-entry ToPA implementations, interrupt will come
* before the output reaches its output region's boundary.
*/
if (!pt_cap_get(PT_CAP_topa_multiple_entries) && !buf->snapshot &&
if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries) &&
!buf->snapshot &&
pt_buffer_region_size(buf) - buf->output_off <= TOPA_PMI_MARGIN) {
void *head = pt_buffer_region(buf);
@ -931,7 +934,7 @@ static int pt_buffer_reset_markers(struct pt_buffer *buf,
/* single entry ToPA is handled by marking all regions STOP=1 INT=1 */
if (!pt_cap_get(PT_CAP_topa_multiple_entries))
if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries))
return 0;
/* clear STOP and INT from current entry */
@ -1082,7 +1085,7 @@ static int pt_buffer_init_topa(struct pt_buffer *buf, unsigned long nr_pages,
pt_buffer_setup_topa_index(buf);
/* link last table to the first one, unless we're double buffering */
if (pt_cap_get(PT_CAP_topa_multiple_entries)) {
if (intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries)) {
TOPA_ENTRY(buf->last, -1)->base = buf->first->phys >> TOPA_SHIFT;
TOPA_ENTRY(buf->last, -1)->end = 1;
}
@ -1153,7 +1156,7 @@ static int pt_addr_filters_init(struct perf_event *event)
struct pt_filters *filters;
int node = event->cpu == -1 ? -1 : cpu_to_node(event->cpu);
if (!pt_cap_get(PT_CAP_num_address_ranges))
if (!intel_pt_validate_hw_cap(PT_CAP_num_address_ranges))
return 0;
filters = kzalloc_node(sizeof(struct pt_filters), GFP_KERNEL, node);
@ -1202,7 +1205,7 @@ static int pt_event_addr_filters_validate(struct list_head *filters)
return -EINVAL;
}
if (++range > pt_cap_get(PT_CAP_num_address_ranges))
if (++range > intel_pt_validate_hw_cap(PT_CAP_num_address_ranges))
return -EOPNOTSUPP;
}
@ -1507,12 +1510,12 @@ static __init int pt_init(void)
if (ret)
return ret;
if (!pt_cap_get(PT_CAP_topa_output)) {
if (!intel_pt_validate_hw_cap(PT_CAP_topa_output)) {
pr_warn("ToPA output is not supported on this CPU\n");
return -ENODEV;
}
if (!pt_cap_get(PT_CAP_topa_multiple_entries))
if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries))
pt_pmu.pmu.capabilities =
PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_AUX_SW_DOUBLEBUF;
@ -1530,7 +1533,7 @@ static __init int pt_init(void)
pt_pmu.pmu.addr_filters_sync = pt_event_addr_filters_sync;
pt_pmu.pmu.addr_filters_validate = pt_event_addr_filters_validate;
pt_pmu.pmu.nr_addr_filters =
pt_cap_get(PT_CAP_num_address_ranges);
intel_pt_validate_hw_cap(PT_CAP_num_address_ranges);
ret = perf_pmu_register(&pt_pmu.pmu, "intel_pt", -1);

21
arch/x86/events/intel/pt.h
View File

@ -45,30 +45,9 @@ struct topa_entry {
u64 rsvd4 : 16;
};
#define PT_CPUID_LEAVES 2
#define PT_CPUID_REGS_NUM 4 /* number of regsters (eax, ebx, ecx, edx) */
/* TSC to Core Crystal Clock Ratio */
#define CPUID_TSC_LEAF 0x15
enum pt_capabilities {
PT_CAP_max_subleaf = 0,
PT_CAP_cr3_filtering,
PT_CAP_psb_cyc,
PT_CAP_ip_filtering,
PT_CAP_mtc,
PT_CAP_ptwrite,
PT_CAP_power_event_trace,
PT_CAP_topa_output,
PT_CAP_topa_multiple_entries,
PT_CAP_single_range_output,
PT_CAP_payloads_lip,
PT_CAP_num_address_ranges,
PT_CAP_mtc_periods,
PT_CAP_cycle_thresholds,
PT_CAP_psb_periods,
};
struct pt_pmu {
struct pmu pmu;
u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];

23
arch/x86/include/asm/intel_pt.h
View File

@ -2,10 +2,33 @@
#ifndef _ASM_X86_INTEL_PT_H
#define _ASM_X86_INTEL_PT_H
#define PT_CPUID_LEAVES 2
#define PT_CPUID_REGS_NUM 4 /* number of regsters (eax, ebx, ecx, edx) */
enum pt_capabilities {
PT_CAP_max_subleaf = 0,
PT_CAP_cr3_filtering,
PT_CAP_psb_cyc,
PT_CAP_ip_filtering,
PT_CAP_mtc,
PT_CAP_ptwrite,
PT_CAP_power_event_trace,
PT_CAP_topa_output,
PT_CAP_topa_multiple_entries,
PT_CAP_single_range_output,
PT_CAP_payloads_lip,
PT_CAP_num_address_ranges,
PT_CAP_mtc_periods,
PT_CAP_cycle_thresholds,
PT_CAP_psb_periods,
};
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
void cpu_emergency_stop_pt(void);
extern u32 intel_pt_validate_hw_cap(enum pt_capabilities cap);
#else
static inline void cpu_emergency_stop_pt(void) {}
static inline u32 intel_pt_validate_hw_cap(enum pt_capabilities cap) { return 0; }
#endif
#endif /* _ASM_X86_INTEL_PT_H */