diff options
Diffstat (limited to 'driver/gator_events_perf_pmu.c')
| -rw-r--r-- | driver/gator_events_perf_pmu.c | 83 |
1 files changed, 77 insertions, 6 deletions
diff --git a/driver/gator_events_perf_pmu.c b/driver/gator_events_perf_pmu.c index 53b2d0a..d472df9 100644 --- a/driver/gator_events_perf_pmu.c +++ b/driver/gator_events_perf_pmu.c @@ -6,13 +6,18 @@ * published by the Free Software Foundation. */ -#include <linux/slab.h> -#include <linux/perf_event.h> #include "gator.h" // gator_events_armvX.c is used for Linux 2.6.x #if GATOR_PERF_PMU_SUPPORT +#include <linux/io.h> +#ifdef CONFIG_OF +#include <linux/of_address.h> +#endif +#include <linux/perf_event.h> +#include <linux/slab.h> + extern bool event_based_sampling; // Maximum number of per-core counters - currently reserves enough space for two full hardware PMUs for big.LITTLE @@ -22,6 +27,9 @@ extern bool event_based_sampling; // + 1 for the cci-400 cycles counter #define UCCNT (CCI_400 + 1) +// Default to 0 if unable to probe the revision which was the previous behavior +#define DEFAULT_CCI_REVISION 0 + // A gator_attr is needed for every counter struct gator_attr { // Set once in gator_events_perf_pmu_*_init - the name of the event in the gatorfs @@ -404,17 +412,81 @@ static void __attr_init(struct gator_attr *const attr) attr->key = gator_events_get_key(); } +#ifdef CONFIG_OF + +static const struct of_device_id arm_cci_matches[] = { + {.compatible = "arm,cci-400" }, + {}, +}; + +static int probe_cci_revision(void) +{ + struct device_node *np; + struct resource res; + void __iomem *cci_ctrl_base; + int rev; + int ret = DEFAULT_CCI_REVISION; + + np = of_find_matching_node(NULL, arm_cci_matches); + if (!np) { + return ret; + } + + if (of_address_to_resource(np, 0, &res)) { + goto node_put; + } + + cci_ctrl_base = ioremap(res.start, resource_size(&res)); + + rev = (readl_relaxed(cci_ctrl_base + 0xfe8) >> 4) & 0xf; + + if (rev <= 4) { + ret = 0; + } else if (rev <= 6) { + ret = 1; + } + + iounmap(cci_ctrl_base); + + node_put: + of_node_put(np); + + return ret; +} + +#else + +static int probe_cci_revision(void) +{ + return DEFAULT_CCI_REVISION; +} + +#endif + static void gator_events_perf_pmu_cci_init(const int type) { int cnt; + const char *cci_name; + + switch (probe_cci_revision()) { + case 0: + cci_name = "cci-400"; + break; + case 1: + cci_name = "cci-400-r1"; + break; + default: + pr_debug("gator: unrecognized cci-400 revision\n"); + return; + } - strncpy(uc_attrs[uc_attr_count].name, "cci-400_ccnt", sizeof(uc_attrs[uc_attr_count].name)); + snprintf(uc_attrs[uc_attr_count].name, sizeof(uc_attrs[uc_attr_count].name), "%s_ccnt", cci_name); uc_attrs[uc_attr_count].type = type; ++uc_attr_count; for (cnt = 0; cnt < CCI_400; ++cnt, ++uc_attr_count) { struct gator_attr *const attr = &uc_attrs[uc_attr_count]; - snprintf(attr->name, sizeof(attr->name), "cci-400_cnt%d", cnt); + snprintf(attr->name, sizeof(attr->name), "%s_cnt%d", cci_name, cnt); attr->type = type; } } @@ -477,7 +549,7 @@ int gator_events_perf_pmu_init(void) } if (pe->pmu != NULL && type == pe->pmu->type) { - if (strcmp("CCI", pe->pmu->name) == 0) { + if (strcmp("CCI", pe->pmu->name) == 0 || strcmp("CCI_400", pe->pmu->name) == 0) { gator_events_perf_pmu_cci_init(type); } else if ((gator_cpu = gator_find_cpu_by_pmu_name(pe->pmu->name)) != NULL) { found_cpu = true; @@ -512,5 +584,4 @@ int gator_events_perf_pmu_init(void) return gator_events_install(&gator_events_perf_pmu_interface); } -gator_events_init(gator_events_perf_pmu_init); #endif |