| /* |
| * Copyright © 2013 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| * |
| */ |
| |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include <linux/perf_event.h> |
| #include <sys/types.h> |
| #include <sys/mman.h> |
| #include <sys/ioctl.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| |
| #include "gpu-perf.h" |
| #include "debugfs.h" |
| |
| #if defined(__i386__) |
| #define rmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory") |
| #endif |
| |
| #if defined(__x86_64__) |
| #define rmb() asm volatile("lfence" ::: "memory") |
| #endif |
| |
| #define N_PAGES 32 |
| |
| struct sample_event { |
| struct perf_event_header header; |
| uint32_t pid, tid; |
| uint64_t time; |
| uint64_t id; |
| uint32_t raw_size; |
| uint32_t raw_hdr0; |
| uint32_t raw_hdr1; |
| uint32_t raw[0]; |
| }; |
| |
| static int |
| perf_event_open(struct perf_event_attr *attr, |
| pid_t pid, |
| int cpu, |
| int group_fd, |
| unsigned long flags) |
| { |
| #ifndef __NR_perf_event_open |
| #if defined(__i386__) |
| #define __NR_perf_event_open 336 |
| #elif defined(__x86_64__) |
| #define __NR_perf_event_open 298 |
| #else |
| #define __NR_perf_event_open 0 |
| #endif |
| #endif |
| |
| attr->size = sizeof(*attr); |
| return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags); |
| } |
| |
| static uint64_t tracepoint_id(const char *sys, const char *name) |
| { |
| char buf[1024]; |
| int fd, n; |
| |
| snprintf(buf, sizeof(buf), "%s/tracing/events/%s/%s/id", debugfs_path, sys, name); |
| fd = open(buf, 0); |
| if (fd < 0) |
| return 0; |
| n = read(fd, buf, sizeof(buf)-1); |
| close(fd); |
| if (n < 0) |
| return 0; |
| |
| buf[n] = '\0'; |
| return strtoull(buf, 0, 0); |
| } |
| |
| static int perf_tracepoint_open(struct gpu_perf *gp, |
| const char *sys, const char *name, |
| int (*func)(struct gpu_perf *, const void *)) |
| { |
| struct perf_event_attr attr; |
| struct gpu_perf_sample *sample; |
| int n, *fd; |
| |
| memset(&attr, 0, sizeof (attr)); |
| |
| attr.type = PERF_TYPE_TRACEPOINT; |
| attr.config = tracepoint_id(sys, name); |
| if (attr.config == 0) |
| return ENOENT; |
| |
| attr.sample_period = 1; |
| attr.sample_type = (PERF_SAMPLE_TIME | PERF_SAMPLE_STREAM_ID | PERF_SAMPLE_TID | PERF_SAMPLE_RAW); |
| attr.read_format = PERF_FORMAT_ID; |
| |
| attr.exclude_guest = 1; |
| |
| n = gp->nr_cpus * (gp->nr_events+1); |
| fd = realloc(gp->fd, n*sizeof(int)); |
| sample = realloc(gp->sample, n*sizeof(*gp->sample)); |
| if (fd == NULL || sample == NULL) |
| return ENOMEM; |
| gp->fd = fd; |
| gp->sample = sample; |
| |
| fd += gp->nr_events * gp->nr_cpus; |
| sample += gp->nr_events * gp->nr_cpus; |
| for (n = 0; n < gp->nr_cpus; n++) { |
| uint64_t track[2]; |
| |
| fd[n] = perf_event_open(&attr, -1, n, -1, 0); |
| if (fd[n] == -1) |
| return errno; |
| |
| /* read back the event to establish id->tracepoint */ |
| if (read(fd[n], track, sizeof(track)) < 0) |
| return errno; |
| sample[n].id = track[1]; |
| sample[n].func = func; |
| } |
| |
| gp->nr_events++; |
| return 0; |
| } |
| |
| static int perf_mmap(struct gpu_perf *gp) |
| { |
| int size = (1 + N_PAGES) * gp->page_size; |
| int *fd, i, j; |
| |
| gp->map = malloc(sizeof(void *)*gp->nr_cpus); |
| if (gp->map == NULL) |
| return ENOMEM; |
| |
| fd = gp->fd; |
| for (j = 0; j < gp->nr_cpus; j++) { |
| gp->map[j] = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd++, 0); |
| if (gp->map[j] == (void *)-1) |
| goto err; |
| } |
| |
| for (i = 1; i < gp->nr_events; i++) { |
| for (j = 0; j < gp->nr_cpus; j++) |
| ioctl(*fd++, PERF_EVENT_IOC_SET_OUTPUT, gp->fd[j]); |
| } |
| |
| return 0; |
| |
| err: |
| while (--j > 0) |
| munmap(gp->map[j], size); |
| free(gp->map); |
| gp->map = NULL; |
| return EINVAL; |
| } |
| |
| static int get_comm(pid_t pid, char *comm, int len) |
| { |
| char filename[1024]; |
| int fd; |
| |
| *comm = '\0'; |
| snprintf(filename, sizeof(filename), "/proc/%d/comm", pid); |
| |
| fd = open(filename, 0); |
| if (fd >= 0) { |
| len = read(fd, comm, len-1); |
| if (len >= 0) |
| comm[len-1] = '\0'; |
| close(fd); |
| } else |
| len = -1; |
| |
| return len; |
| } |
| |
| static struct gpu_perf_comm * |
| lookup_comm(struct gpu_perf *gp, pid_t pid) |
| { |
| struct gpu_perf_comm *comm; |
| |
| if (pid == 0) |
| return NULL; |
| |
| for (comm = gp->comm; comm != NULL; comm = comm->next) { |
| if (comm->pid == pid) |
| break; |
| } |
| if (comm == NULL) { |
| comm = calloc(1, sizeof(*comm)); |
| if (comm == NULL) |
| return NULL; |
| |
| if (get_comm(pid, comm->name, sizeof(comm->name)) < 0) { |
| free(comm); |
| return NULL; |
| } |
| |
| comm->pid = pid; |
| comm->next = gp->comm; |
| gp->comm = comm; |
| } |
| |
| return comm; |
| } |
| |
| static int request_add(struct gpu_perf *gp, const void *event) |
| { |
| const struct sample_event *sample = event; |
| struct gpu_perf_comm *comm; |
| |
| comm = lookup_comm(gp, sample->pid); |
| if (comm == NULL) |
| return 0; |
| |
| comm->nr_requests[sample->raw[1]]++; |
| return 1; |
| } |
| |
| static int flip_complete(struct gpu_perf *gp, const void *event) |
| { |
| const struct sample_event *sample = event; |
| |
| gp->flip_complete[sample->raw[0]]++; |
| return 1; |
| } |
| |
| static int wait_begin(struct gpu_perf *gp, const void *event) |
| { |
| const struct sample_event *sample = event; |
| struct gpu_perf_comm *comm; |
| struct gpu_perf_time *wait; |
| |
| comm = lookup_comm(gp, sample->pid); |
| if (comm == NULL) |
| return 0; |
| |
| wait = malloc(sizeof(*wait)); |
| if (wait == NULL) |
| return 0; |
| |
| wait->comm = comm; |
| wait->seqno = sample->raw[2]; |
| wait->time = sample->time; |
| wait->next = gp->wait[sample->raw[1]]; |
| gp->wait[sample->raw[1]] = wait; |
| |
| return 0; |
| } |
| |
| static int wait_end(struct gpu_perf *gp, const void *event) |
| { |
| const struct sample_event *sample = event; |
| struct gpu_perf_time *wait, **prev; |
| |
| for (prev = &gp->wait[sample->raw[1]]; (wait = *prev) != NULL; prev = &wait->next) { |
| if (wait->seqno != sample->raw[2]) |
| continue; |
| |
| wait->comm->wait_time += sample->time - wait->time; |
| *prev = wait->next; |
| free(wait); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| void gpu_perf_init(struct gpu_perf *gp, unsigned flags) |
| { |
| memset(gp, 0, sizeof(*gp)); |
| gp->nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
| gp->page_size = getpagesize(); |
| |
| perf_tracepoint_open(gp, "i915", "i915_gem_request_add", request_add); |
| if (perf_tracepoint_open(gp, "i915", "i915_gem_request_wait_begin", wait_begin) == 0) |
| perf_tracepoint_open(gp, "i915", "i915_gem_request_wait_end", wait_end); |
| perf_tracepoint_open(gp, "i915", "i915_flip_complete", flip_complete); |
| |
| if (gp->nr_events == 0) { |
| gp->error = "i915.ko tracepoints not available"; |
| return; |
| } |
| |
| if (perf_mmap(gp)) |
| return; |
| } |
| |
| static int process_sample(struct gpu_perf *gp, |
| const struct perf_event_header *header) |
| { |
| const struct sample_event *sample = (const struct sample_event *)header; |
| int n, update = 0; |
| |
| /* hash me! */ |
| for (n = 0; n < gp->nr_cpus * gp->nr_events; n++) { |
| if (gp->sample[n].id != sample->id) |
| continue; |
| |
| update = 1; |
| if (gp->sample[n].func) |
| update = gp->sample[n].func(gp, sample); |
| break; |
| } |
| |
| return update; |
| } |
| |
| int gpu_perf_update(struct gpu_perf *gp) |
| { |
| const int size = N_PAGES * gp->page_size; |
| const int mask = size - 1; |
| uint8_t *buffer = NULL; |
| int buffer_size = 0; |
| int n, update = 0; |
| |
| if (gp->map == NULL) |
| return 0; |
| |
| for (n = 0; n < gp->nr_cpus; n++) { |
| struct perf_event_mmap_page *mmap = gp->map[n]; |
| const uint8_t *data; |
| uint64_t head, tail; |
| int wrap = 0; |
| |
| tail = mmap->data_tail; |
| head = mmap->data_head; |
| rmb(); |
| |
| if (head < tail) { |
| wrap = 1; |
| tail &= mask; |
| head &= mask; |
| head += size; |
| } |
| |
| data = (uint8_t *)mmap + gp->page_size; |
| while (head - tail >= sizeof (struct perf_event_header)) { |
| const struct perf_event_header *header; |
| |
| header = (const struct perf_event_header *)(data + (tail & mask)); |
| if (header->size > head - tail) |
| break; |
| |
| if ((const uint8_t *)header + header->size > data + size) { |
| int before; |
| |
| if (header->size > buffer_size) { |
| uint8_t *b = realloc(buffer, header->size); |
| if (b == NULL) |
| break; |
| |
| buffer = b; |
| buffer_size = header->size; |
| } |
| |
| before = data + size - (const uint8_t *)header; |
| |
| memcpy(buffer, header, before); |
| memcpy(buffer + before, data, header->size - before); |
| |
| header = (struct perf_event_header *)buffer; |
| } |
| |
| if (header->type == PERF_RECORD_SAMPLE) |
| update += process_sample(gp, header); |
| tail += header->size; |
| } |
| |
| if (wrap) |
| tail &= mask; |
| mmap->data_tail = tail; |
| } |
| |
| free(buffer); |
| return update; |
| } |