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drm/i915/selftests: Basic stress test for rapid context switching
We need to exercise the HW and submission paths for switching contexts rapidly to check that features such as execlists' wa_tail are adequate. Plus it's an interesting baseline latency metric. v2: Check the initial request for allocation errors v3: Use finite waits for more robust handling of broken code Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180920105809.1872-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
parent
82c7c4fcbf
commit
a47cd45a37
@ -22,6 +22,8 @@
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*
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*/
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#include <linux/prime_numbers.h>
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#include "../i915_selftest.h"
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#include "i915_random.h"
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#include "igt_flush_test.h"
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@ -32,6 +34,198 @@
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#define DW_PER_PAGE (PAGE_SIZE / sizeof(u32))
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struct live_test {
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struct drm_i915_private *i915;
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const char *func;
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const char *name;
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unsigned int reset_count;
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};
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static int begin_live_test(struct live_test *t,
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struct drm_i915_private *i915,
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const char *func,
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const char *name)
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{
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int err;
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t->i915 = i915;
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t->func = func;
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t->name = name;
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err = i915_gem_wait_for_idle(i915,
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I915_WAIT_LOCKED,
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MAX_SCHEDULE_TIMEOUT);
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if (err) {
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pr_err("%s(%s): failed to idle before, with err=%d!",
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func, name, err);
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return err;
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}
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i915->gpu_error.missed_irq_rings = 0;
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t->reset_count = i915_reset_count(&i915->gpu_error);
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return 0;
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}
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static int end_live_test(struct live_test *t)
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{
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struct drm_i915_private *i915 = t->i915;
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if (igt_flush_test(i915, I915_WAIT_LOCKED))
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return -EIO;
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if (t->reset_count != i915_reset_count(&i915->gpu_error)) {
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pr_err("%s(%s): GPU was reset %d times!\n",
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t->func, t->name,
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i915_reset_count(&i915->gpu_error) - t->reset_count);
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return -EIO;
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}
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if (i915->gpu_error.missed_irq_rings) {
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pr_err("%s(%s): Missed interrupts on engines %lx\n",
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t->func, t->name, i915->gpu_error.missed_irq_rings);
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return -EIO;
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}
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return 0;
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}
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static int live_nop_switch(void *arg)
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{
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const unsigned int nctx = 1024;
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struct drm_i915_private *i915 = arg;
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struct intel_engine_cs *engine;
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struct i915_gem_context **ctx;
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enum intel_engine_id id;
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struct drm_file *file;
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struct live_test t;
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unsigned long n;
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int err = -ENODEV;
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/*
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* Create as many contexts as we can feasibly get away with
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* and check we can switch between them rapidly.
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*
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* Serves as very simple stress test for submission and HW switching
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* between contexts.
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*/
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if (!DRIVER_CAPS(i915)->has_logical_contexts)
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return 0;
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file = mock_file(i915);
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if (IS_ERR(file))
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return PTR_ERR(file);
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mutex_lock(&i915->drm.struct_mutex);
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ctx = kcalloc(nctx, sizeof(*ctx), GFP_KERNEL);
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if (!ctx) {
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err = -ENOMEM;
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goto out_unlock;
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}
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for (n = 0; n < nctx; n++) {
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ctx[n] = i915_gem_create_context(i915, file->driver_priv);
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if (IS_ERR(ctx[n])) {
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err = PTR_ERR(ctx[n]);
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goto out_unlock;
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}
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}
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for_each_engine(engine, i915, id) {
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struct i915_request *rq;
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unsigned long end_time, prime;
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ktime_t times[2] = {};
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times[0] = ktime_get_raw();
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for (n = 0; n < nctx; n++) {
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rq = i915_request_alloc(engine, ctx[n]);
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if (IS_ERR(rq)) {
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err = PTR_ERR(rq);
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goto out_unlock;
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}
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i915_request_add(rq);
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}
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if (i915_request_wait(rq,
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I915_WAIT_LOCKED,
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HZ / 5) < 0) {
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pr_err("Failed to populated %d contexts\n", nctx);
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i915_gem_set_wedged(i915);
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err = -EIO;
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goto out_unlock;
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}
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times[1] = ktime_get_raw();
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pr_info("Populated %d contexts on %s in %lluns\n",
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nctx, engine->name, ktime_to_ns(times[1] - times[0]));
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err = begin_live_test(&t, i915, __func__, engine->name);
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if (err)
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goto out_unlock;
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end_time = jiffies + i915_selftest.timeout_jiffies;
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for_each_prime_number_from(prime, 2, 8192) {
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times[1] = ktime_get_raw();
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for (n = 0; n < prime; n++) {
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rq = i915_request_alloc(engine, ctx[n % nctx]);
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if (IS_ERR(rq)) {
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err = PTR_ERR(rq);
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goto out_unlock;
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}
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/*
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* This space is left intentionally blank.
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*
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* We do not actually want to perform any
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* action with this request, we just want
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* to measure the latency in allocation
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* and submission of our breadcrumbs -
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* ensuring that the bare request is sufficient
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* for the system to work (i.e. proper HEAD
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* tracking of the rings, interrupt handling,
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* etc). It also gives us the lowest bounds
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* for latency.
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*/
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i915_request_add(rq);
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}
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if (i915_request_wait(rq,
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I915_WAIT_LOCKED,
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HZ / 5) < 0) {
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pr_err("Switching between %ld contexts timed out\n",
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prime);
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i915_gem_set_wedged(i915);
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break;
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}
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times[1] = ktime_sub(ktime_get_raw(), times[1]);
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if (prime == 2)
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times[0] = times[1];
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if (__igt_timeout(end_time, NULL))
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break;
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}
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err = end_live_test(&t);
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if (err)
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goto out_unlock;
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pr_info("Switch latencies on %s: 1 = %lluns, %lu = %lluns\n",
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engine->name,
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ktime_to_ns(times[0]),
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prime - 1, div64_u64(ktime_to_ns(times[1]), prime - 1));
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}
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out_unlock:
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mutex_unlock(&i915->drm.struct_mutex);
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mock_file_free(i915, file);
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return err;
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}
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static struct i915_vma *
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gpu_fill_dw(struct i915_vma *vma, u64 offset, unsigned long count, u32 value)
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{
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@ -714,6 +908,7 @@ int i915_gem_context_live_selftests(struct drm_i915_private *dev_priv)
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{
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static const struct i915_subtest tests[] = {
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SUBTEST(igt_switch_to_kernel_context),
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SUBTEST(live_nop_switch),
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SUBTEST(igt_ctx_exec),
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SUBTEST(igt_ctx_readonly),
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};
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