Messages in this thread Patch in this message | | | From | Madhavan Srinivasan <> | Subject | [PATCH v3 4/7]powerpc/powernv: detect supported nest pmus and its events | Date | Thu, 25 Jun 2015 15:26:16 +0530 |
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Parse device tree to detect supported nest pmu units. Traverse through each nest pmu unit folder to find supported events and corresponding unit/scale files (if any).
The nest unit event file from DT, will contain the offset in the reserved memory region to get the counter data for a given event. Kernel code uses this offset as event configuration value.
Device tree parser code also looks for scale/unit in the file name and passes on the file as an event attr for perf tool to use in the post processing.
Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Stephane Eranian <eranian@google.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> --- arch/powerpc/perf/nest-pmu.c | 124 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 123 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c index e7d45ed..6116ff3 100644 --- a/arch/powerpc/perf/nest-pmu.c +++ b/arch/powerpc/perf/nest-pmu.c @@ -11,6 +11,119 @@ #include "nest-pmu.h" static struct perchip_nest_info p8_nest_perchip_info[P8_NEST_MAX_CHIPS]; +static struct nest_pmu *per_nest_pmu_arr[P8_NEST_MAX_PMUS]; + +static int nest_event_info(struct property *pp, char *start, + struct nest_ima_events *p8_events, int flg, u32 val) +{ + char *buf; + + /* memory for event name */ + buf = kzalloc(P8_NEST_MAX_PMU_NAME_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + strncpy(buf, start, strlen(start)); + p8_events->ev_name = buf; + + /* memory for content */ + buf = kzalloc(P8_NEST_MAX_PMU_NAME_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + if (flg) { + /* string content*/ + if (!pp->value || + (strnlen(pp->value, pp->length) == pp->length)) + return -EINVAL; + + strncpy(buf, (const char *)pp->value, pp->length); + } else + sprintf(buf, "event=0x%x", val); + + p8_events->ev_value = buf; + return 0; +} + +static int nest_pmu_create(struct device_node *dev, int pmu_index) +{ + struct nest_ima_events **p8_events_arr, *p8_events; + struct nest_pmu *pmu_ptr; + struct property *pp; + char *buf, *start; + const __be32 *lval; + u32 val; + int idx = 0, ret; + + if (!dev) + return -EINVAL; + + /* memory for nest pmus */ + pmu_ptr = kzalloc(sizeof(struct nest_pmu), GFP_KERNEL); + if (!pmu_ptr) + return -ENOMEM; + + /* Needed for hotplug/migration */ + per_nest_pmu_arr[pmu_index] = pmu_ptr; + + /* memory for nest pmu events */ + p8_events_arr = kzalloc((sizeof(struct nest_ima_events) * 64), + GFP_KERNEL); + if (!p8_events_arr) + return -ENOMEM; + p8_events = (struct nest_ima_events *)p8_events_arr; + + /* + * Loop through each property + */ + for_each_property_of_node(dev, pp) { + start = pp->name; + + if (!strcmp(pp->name, "name")) { + if (!pp->value || + (strnlen(pp->value, pp->length) == pp->length)) + return -EINVAL; + + buf = kzalloc(P8_NEST_MAX_PMU_NAME_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + /* Save the name to register it later */ + sprintf(buf, "Nest_%s", (char *)pp->value); + pmu_ptr->pmu.name = (char *)buf; + continue; + } + + /* Skip these, we dont need it */ + if (!strcmp(pp->name, "phandle") || + !strcmp(pp->name, "device_type") || + !strcmp(pp->name, "linux,phandle")) + continue; + + if (strncmp(pp->name, "unit.", 5) == 0) { + /* Skip first few chars in the name */ + start += 5; + ret = nest_event_info(pp, start, p8_events++, 1, 0); + } else if (strncmp(pp->name, "scale.", 6) == 0) { + /* Skip first few chars in the name */ + start += 6; + ret = nest_event_info(pp, start, p8_events++, 1, 0); + } else { + lval = of_get_property(dev, pp->name, NULL); + val = (uint32_t)be32_to_cpup(lval); + + ret = nest_event_info(pp, start, p8_events++, 0, val); + } + + if (ret) + return ret; + + /* book keeping */ + idx++; + } + + return 0; +} static int nest_ima_dt_parser(void) { @@ -19,7 +132,7 @@ static int nest_ima_dt_parser(void) const __be64 *chip_ima_size; struct device_node *dev; struct perchip_nest_info *p8ni; - int idx; + int idx, ret; /* * "nest-ima" folder contains two things, @@ -50,6 +163,15 @@ static int nest_ima_dt_parser(void) p8ni->vbase = (uint64_t) phys_to_virt(p8ni->pbase); } + /* Look for supported Nest PMU units */ + idx = 0; + for_each_node_by_type(dev, "nest-ima-unit") { + ret = nest_pmu_create(dev, idx); + if (ret) + return ret; + idx++; + } + return 0; } -- 1.9.1
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