From 65d2481900c619846eddadb85086edbc578d6c17 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 27 Aug 2013 15:19:58 +0100 Subject: overlay: read rc6 status from perf Signed-off-by: Chris Wilson --- overlay/rc6.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 82 insertions(+), 21 deletions(-) (limited to 'overlay/rc6.c') diff --git a/overlay/rc6.c b/overlay/rc6.c index 500639ac..d7047c2f 100644 --- a/overlay/rc6.c +++ b/overlay/rc6.c @@ -32,17 +32,58 @@ #include #include "rc6.h" +#include "perf.h" -int rc6_init(struct rc6 *rc6) +static int perf_i915_open(int config, int group) +{ + struct perf_event_attr attr; + + memset(&attr, 0, sizeof (attr)); + + attr.type = i915_type_id(); + if (attr.type == 0) + return -ENOENT; + attr.config = config; + + attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED; + if (group == -1) + attr.read_format |= PERF_FORMAT_GROUP; + + return perf_event_open(&attr, -1, 0, group, 0); +} + +#define RC6 (1<<0) +#define RC6p (1<<1) +#define RC6pp (1<<2) + +static int perf_open(unsigned *flags) { - struct stat st; int fd; + fd = perf_i915_open(I915_PERF_RC6_RESIDENCY, -1); + if (fd < 0) + return -1; + + *flags |= RC6; + if (perf_i915_open(I915_PERF_RC6p_RESIDENCY, fd) >= 0) + *flags |= RC6p; + + if (perf_i915_open(I915_PERF_RC6pp_RESIDENCY, fd) >= 0) + *flags |= RC6pp; + + return fd; +} + +int rc6_init(struct rc6 *rc6) +{ memset(rc6, 0, sizeof(*rc6)); - fd = stat("/sys/class/drm/card0/power", &st); - if (fd == -1) - return rc6->error = errno; + rc6->fd = perf_open(&rc6->flags); + if (rc6->fd == -1) { + struct stat st; + if (stat("/sys/class/drm/card0/power", &st) < 0) + return rc6->error = errno; + } return 0; } @@ -54,13 +95,13 @@ static uint64_t file_to_u64(const char *path) fd = open(path, 0); if (fd < 0) - return 0; + return -1; len = read(fd, buf, sizeof(buf)-1); close(fd); if (len < 0) - return 0; + return -1; buf[len] = '\0'; @@ -82,37 +123,57 @@ int rc6_update(struct rc6 *rc6) struct rc6_stat *s = &rc6->stat[rc6->count++&1]; struct rc6_stat *d = &rc6->stat[rc6->count&1]; uint64_t d_time, d_rc6, d_rc6p, d_rc6pp; - struct stat st; if (rc6->error) return rc6->error; - if (stat("/sys/class/drm/card0/power/rc6_residency_ms", &st) < 0) - return rc6->error = ENOENT; + if (rc6->fd == -1) { + struct stat st; - rc6->enabled = file_to_u64("/sys/class/drm/card0/power/rc6_enable"); - if (rc6->enabled == 0) - return EAGAIN; + if (stat("/sys/class/drm/card0/power/rc6_residency_ms", &st) < 0) + return rc6->error = ENOENT; + + s->rc6_residency = file_to_u64("/sys/class/drm/card0/power/rc6_residency_ms"); + s->rc6p_residency = file_to_u64("/sys/class/drm/card0/power/rc6p_residency_ms"); + s->rc6pp_residency = file_to_u64("/sys/class/drm/card0/power/rc6pp_residency_ms"); + s->timestamp = clock_ms_to_u64(); + } else { + uint64_t data[5]; + int len; - s->rc6_residency = file_to_u64("/sys/class/drm/card0/power/rc6_residency_ms"); - s->rc6p_residency = file_to_u64("/sys/class/drm/card0/power/rc6p_residency_ms"); - s->rc6pp_residency = file_to_u64("/sys/class/drm/card0/power/rc6pp_residency_ms"); - s->timestamp = clock_ms_to_u64(); + len = read(rc6->fd, data, sizeof(data)); + if (len < 0) + return rc6->error = errno; + + s->timestamp = data[1] / (1000*1000); + + len = 2; + if (rc6->flags & RC6) + s->rc6_residency = data[len++]; + if (rc6->flags & RC6p) + s->rc6p_residency = data[len++]; + if (rc6->flags & RC6pp) + s->rc6pp_residency = data[len++]; + } if (rc6->count == 1) return EAGAIN; d_time = s->timestamp - d->timestamp; + if (d_time == 0) { + rc6->count--; + return EAGAIN; + } d_rc6 = s->rc6_residency - d->rc6_residency; - rc6->rc6 = 100 * d_rc6 / d_time; + rc6->rc6 = (100 * d_rc6 + d_time/2) / d_time; d_rc6p = s->rc6p_residency - d->rc6p_residency; - rc6->rc6p = 100 * d_rc6p / d_time; + rc6->rc6p = (100 * d_rc6p + d_time/2) / d_time; d_rc6pp = s->rc6pp_residency - d->rc6pp_residency; - rc6->rc6pp = 100 * d_rc6pp / d_time; + rc6->rc6pp = (100 * d_rc6pp + d_time/2) / d_time; - rc6->rc6_combined = 100 * (d_rc6 + d_rc6p + d_rc6pp) / d_time; + rc6->rc6_combined = (100 * (d_rc6 + d_rc6p + d_rc6pp) + d_time/2) / d_time; return 0; } -- cgit v1.2.3