[Intel-gfx] [PATCH igt] igt/pm_rps: Replace arbitrary HIGH_LOAD blit with a busyspin
Chris Wilson
chris at chris-wilson.co.uk
Mon Dec 4 10:32:30 UTC 2017
Using a blit + sleep does not guarantee generating a high enough load to
keep the GPU busy, a busyspin does. Replace the blit at high load with a
continuous series spins and low load with a mix of spin and sleep.
References: https://bugs.freedesktop.org/show_bug.cgi?id=104060
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
tests/pm_rps.c | 160 ++++++++++-----------------------------------------------
1 file changed, 27 insertions(+), 133 deletions(-)
diff --git a/tests/pm_rps.c b/tests/pm_rps.c
index cc94813e..88aca400 100644
--- a/tests/pm_rps.c
+++ b/tests/pm_rps.c
@@ -26,7 +26,6 @@
*
*/
-#include "igt.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -37,7 +36,8 @@
#include <time.h>
#include <sys/wait.h>
-#include "intel_bufmgr.h"
+#include "igt.h"
+#include "igt_dummyload.h"
IGT_TEST_DESCRIPTION("Render P-States tests - verify GPU frequency changes");
@@ -181,15 +181,9 @@ enum load {
};
static struct load_helper {
- int devid;
- int has_ppgtt;
- drm_intel_bufmgr *bufmgr;
- struct intel_batchbuffer *batch;
- drm_intel_bo *target_buffer;
enum load load;
bool exit;
struct igt_helper_process igt_proc;
- drm_intel_bo *src, *dst;
} lh;
static void load_helper_signal_handler(int sig)
@@ -201,29 +195,6 @@ static void load_helper_signal_handler(int sig)
lh.exit = true;
}
-static void emit_store_dword_imm(uint32_t val)
-{
- int cmd;
- struct intel_batchbuffer *batch = lh.batch;
-
- cmd = MI_STORE_DWORD_IMM;
- if (!lh.has_ppgtt)
- cmd |= MI_MEM_VIRTUAL;
-
- BEGIN_BATCH(4, 0); /* just ignore the reloc we emit and count dwords */
- OUT_BATCH(cmd);
- if (batch->gen >= 8) {
- OUT_RELOC(lh.target_buffer, I915_GEM_DOMAIN_INSTRUCTION,
- I915_GEM_DOMAIN_INSTRUCTION, 0);
- } else {
- OUT_BATCH(0); /* reserved */
- OUT_RELOC(lh.target_buffer, I915_GEM_DOMAIN_INSTRUCTION,
- I915_GEM_DOMAIN_INSTRUCTION, 0);
- }
- OUT_BATCH(val);
- ADVANCE_BATCH();
-}
-
#define LOAD_HELPER_PAUSE_USEC 500
#define LOAD_HELPER_BO_SIZE (16*1024*1024)
static void load_helper_set_load(enum load load)
@@ -252,69 +223,45 @@ static void load_helper_run(enum load load)
lh.load = load;
igt_fork_helper(&lh.igt_proc) {
- const uint32_t bbe = MI_BATCH_BUFFER_END;
- struct drm_i915_gem_exec_object2 object;
- struct drm_i915_gem_execbuffer2 execbuf;
- uint32_t fences[3];
- uint32_t val = 0;
+ igt_spin_t *spin[2] = {};
+ uint32_t handle;
signal(SIGUSR1, load_helper_signal_handler);
signal(SIGUSR2, load_helper_signal_handler);
- fences[0] = gem_create(drm_fd, 4096);
- gem_write(drm_fd, fences[0], 0, &bbe, sizeof(bbe));
- fences[1] = gem_create(drm_fd, 4096);
- gem_write(drm_fd, fences[1], 0, &bbe, sizeof(bbe));
- fences[2] = gem_create(drm_fd, 4096);
- gem_write(drm_fd, fences[2], 0, &bbe, sizeof(bbe));
-
- memset(&execbuf, 0, sizeof(execbuf));
- execbuf.buffers_ptr = (uintptr_t)&object;
- execbuf.buffer_count = 1;
- if (intel_gen(lh.devid) >= 6)
- execbuf.flags = I915_EXEC_BLT;
-
igt_debug("Applying %s load...\n", lh.load ? "high" : "low");
while (!lh.exit) {
- memset(&object, 0, sizeof(object));
- object.handle = fences[val%3];
-
- while (gem_bo_busy(drm_fd, object.handle))
- usleep(100);
-
- if (lh.load == HIGH)
- intel_copy_bo(lh.batch, lh.dst, lh.src,
- LOAD_HELPER_BO_SIZE);
-
- emit_store_dword_imm(val);
- intel_batchbuffer_flush_on_ring(lh.batch,
- I915_EXEC_BLT);
- val++;
-
- gem_execbuf(drm_fd, &execbuf);
+ igt_spin_batch_free(drm_fd, spin[0]);
+ usleep(100);
+ spin[0] = spin[1];
+ spin[lh.load == HIGH] =
+ igt_spin_batch_new(drm_fd, 0, 0, 0);
+ }
- /* Lower the load by pausing after every submitted
- * write. */
- if (lh.load == LOW)
- usleep(LOAD_HELPER_PAUSE_USEC);
+ if (spin[0]) {
+ handle = spin[0]->handle;
+ igt_spin_batch_end(spin[0]);
+ }
+ if (spin[1]) {
+ handle = spin[1]->handle;
+ igt_spin_batch_end(spin[1]);
}
/* Wait for completion without boosting */
usleep(1000);
- while (gem_bo_busy(drm_fd, lh.target_buffer->handle))
+ while (gem_bo_busy(drm_fd, handle))
usleep(1000);
- igt_debug("load helper sent %u dword writes\n", val);
- gem_close(drm_fd, fences[0]);
- gem_close(drm_fd, fences[1]);
- gem_close(drm_fd, fences[2]);
-
- /* Idle/boost logic is tied with request retirement.
+ /*
+ * Idle/boost logic is tied with request retirement.
* Speed up detection of idle state and ensure deboost
* after removing load.
*/
igt_drop_caches_set(drm_fd, DROP_RETIRE);
+
+ igt_spin_batch_free(drm_fd, spin[1]);
+ igt_spin_batch_free(drm_fd, spin[0]);
}
}
@@ -324,54 +271,6 @@ static void load_helper_stop(void)
igt_assert(igt_wait_helper(&lh.igt_proc) == 0);
}
-static void load_helper_init(void)
-{
- lh.devid = intel_get_drm_devid(drm_fd);
- lh.has_ppgtt = gem_uses_ppgtt(drm_fd);
-
- /* MI_STORE_DATA can only use GTT address on gen4+/g33 and needs
- * snoopable mem on pre-gen6. Hence load-helper only works on gen6+, but
- * that's also all we care about for the rps testcase*/
- igt_assert(intel_gen(lh.devid) >= 6);
- lh.bufmgr = drm_intel_bufmgr_gem_init(drm_fd, 4096);
- igt_assert(lh.bufmgr);
-
- drm_intel_bufmgr_gem_enable_reuse(lh.bufmgr);
-
- lh.batch = intel_batchbuffer_alloc(lh.bufmgr, lh.devid);
- igt_assert(lh.batch);
-
- lh.target_buffer = drm_intel_bo_alloc(lh.bufmgr, "target bo",
- 4096, 4096);
- igt_assert(lh.target_buffer);
-
- lh.dst = drm_intel_bo_alloc(lh.bufmgr, "dst bo",
- LOAD_HELPER_BO_SIZE, 4096);
- igt_assert(lh.dst);
- lh.src = drm_intel_bo_alloc(lh.bufmgr, "src bo",
- LOAD_HELPER_BO_SIZE, 4096);
- igt_assert(lh.src);
-}
-
-static void load_helper_deinit(void)
-{
- if (lh.igt_proc.running)
- load_helper_stop();
-
- if (lh.target_buffer)
- drm_intel_bo_unreference(lh.target_buffer);
- if (lh.src)
- drm_intel_bo_unreference(lh.src);
- if (lh.dst)
- drm_intel_bo_unreference(lh.dst);
-
- if (lh.batch)
- intel_batchbuffer_free(lh.batch);
-
- if (lh.bufmgr)
- drm_intel_bufmgr_destroy(lh.bufmgr);
-}
-
static void do_load_gpu(void)
{
load_helper_run(LOW);
@@ -582,13 +481,8 @@ static void boost_freq(int fd, int *boost_freqs)
{
int64_t timeout = 1;
igt_spin_t *load;
- unsigned int engine;
- /* Put boost on the same engine as low load */
- engine = I915_EXEC_RENDER;
- if (intel_gen(lh.devid) >= 6)
- engine = I915_EXEC_BLT;
- load = igt_spin_batch_new(fd, 0, engine, 0);
+ load = igt_spin_batch_new(fd, 0, 0, 0);
/* Waiting will grant us a boost to maximum */
gem_wait(fd, load->handle, &timeout);
@@ -655,7 +549,9 @@ static void pm_rps_exit_handler(int sig)
writeval(sysfs_files[MAX].filp, origfreqs[MAX]);
}
- load_helper_deinit();
+ if (lh.igt_proc.running)
+ load_helper_stop();
+
close(drm_fd);
}
@@ -691,8 +587,6 @@ igt_main
read_freqs(origfreqs);
igt_install_exit_handler(pm_rps_exit_handler);
-
- load_helper_init();
}
igt_subtest("basic-api")
--
2.15.1
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