[PATCH 4/9] drm/i915/selftests: Perform some basic cycle counting of MI ops
Chris Wilson
chris at chris-wilson.co.uk
Fri Nov 1 23:09:56 UTC 2019
Some basic information that is useful to know, such as how many cycles
is a MI_NOOP.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Anna Karas <anna.karas at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
.../i915/gem/selftests/i915_gem_object_blt.c | 15 +-
drivers/gpu/drm/i915/gt/selftest_engine_cs.c | 339 +++++++++++++++++-
drivers/gpu/drm/i915/i915_pci.c | 6 +
drivers/gpu/drm/i915/i915_selftest.h | 4 +
.../drm/i915/selftests/i915_perf_selftests.h | 13 +
.../gpu/drm/i915/selftests/i915_selftest.c | 43 +++
6 files changed, 417 insertions(+), 3 deletions(-)
create mode 100644 drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c
index e8132aca0bb6..a3df51ab40a0 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c
@@ -507,8 +507,6 @@ static int igt_copy_blt(void *arg)
int i915_gem_object_blt_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
- SUBTEST(perf_fill_blt),
- SUBTEST(perf_copy_blt),
SUBTEST(igt_fill_blt),
SUBTEST(igt_copy_blt),
};
@@ -521,3 +519,16 @@ int i915_gem_object_blt_live_selftests(struct drm_i915_private *i915)
return i915_live_subtests(tests, i915);
}
+
+int i915_gem_object_blt_perf_selftests(struct drm_i915_private *i915)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(perf_fill_blt),
+ SUBTEST(perf_copy_blt),
+ };
+
+ if (intel_gt_is_wedged(&i915->gt))
+ return 0;
+
+ return i915_live_subtests(tests, i915);
+}
diff --git a/drivers/gpu/drm/i915/gt/selftest_engine_cs.c b/drivers/gpu/drm/i915/gt/selftest_engine_cs.c
index 3880f07c29b8..aa6b1997eddb 100644
--- a/drivers/gpu/drm/i915/gt/selftest_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/selftest_engine_cs.c
@@ -4,7 +4,344 @@
* Copyright © 2018 Intel Corporation
*/
-#include "../i915_selftest.h"
+#include <linux/sort.h>
+
+#include "intel_gt_pm.h"
+#include "intel_rps.h"
+
+#include "i915_selftest.h"
+#include "selftests/igt_flush_test.h"
+
+#define COUNT 5
+
+static int cmp_u32(const void *A, const void *B)
+{
+ const u32 *a = A, *b = B;
+
+ return *a - *b;
+}
+
+static void perf_begin(struct intel_gt *gt)
+{
+ intel_gt_pm_get(gt);
+
+ /* Boost gpufreq to max [waitboost] and keep it fixed */
+ atomic_inc(>->rps.num_waiters);
+ schedule_work(>->rps.work);
+ flush_work(>->rps.work);
+}
+
+static int perf_end(struct intel_gt *gt)
+{
+ atomic_dec(>->rps.num_waiters);
+ intel_gt_pm_put(gt);
+
+ return igt_flush_test(gt->i915);
+}
+
+static int write_timestamp(struct i915_request *rq, int slot)
+{
+ u32 cmd;
+ u32 *cs;
+
+ cs = intel_ring_begin(rq, 4);
+ if (IS_ERR(cs))
+ return PTR_ERR(cs);
+
+ cmd = MI_STORE_REGISTER_MEM | MI_USE_GGTT;
+ if (INTEL_GEN(rq->i915) >= 8)
+ cmd++;
+ *cs++ = cmd;
+ *cs++ = rq->engine->mmio_base + 0x358;
+ *cs++ = i915_request_timeline(rq)->hwsp_offset + slot * sizeof(u32);
+ *cs++ = 0;
+
+ intel_ring_advance(rq, cs);
+
+ return 0;
+}
+
+static struct i915_vma *create_empty_batch(struct intel_context *ce)
+{
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ u32 *cs;
+ int err;
+
+ obj = i915_gem_object_create_internal(ce->engine->i915, PAGE_SIZE);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ cs = i915_gem_object_pin_map(obj, I915_MAP_WB);
+ if (IS_ERR(cs)) {
+ i915_gem_object_put(obj);
+ return ERR_CAST(cs);
+ }
+
+ cs[0] = MI_BATCH_BUFFER_END;
+
+ i915_gem_object_flush_map(obj);
+ i915_gem_object_unpin_map(obj);
+
+ vma = i915_vma_instance(obj, ce->vm, NULL);
+ if (IS_ERR(vma)) {
+ i915_gem_object_put(obj);
+ return vma;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ if (err) {
+ i915_gem_object_put(obj);
+ return ERR_PTR(err);
+ }
+
+ return vma;
+}
+
+static u32 trifilter(u32 *a)
+{
+ u64 sum;
+
+ sort(a, COUNT, sizeof(*a), cmp_u32, NULL);
+
+ sum += mul_u32_u32(a[2], 2);
+ sum += a[1];
+ sum += a[3];
+
+ return sum >> 2;
+}
+
+static int perf_mi_bb_start(void *arg)
+{
+ struct intel_gt *gt = arg;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ int err = 0;
+
+ if (INTEL_GEN(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
+ return 0;
+
+ perf_begin(gt);
+ for_each_engine(engine, gt, id) {
+ struct intel_context *ce = engine->kernel_context;
+ struct i915_vma *batch;
+ u32 cycles[COUNT];
+ int i;
+
+ batch = create_empty_batch(ce);
+ if (IS_ERR(batch)) {
+ err = PTR_ERR(batch);
+ break;
+ }
+
+ err = i915_vma_sync(batch);
+ if (err) {
+ i915_vma_put(batch);
+ break;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cycles); i++) {
+ struct i915_request *rq;
+
+ rq = i915_request_create(ce);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ break;
+ }
+
+ err = write_timestamp(rq, 2);
+ if (err)
+ goto out;
+
+ err = rq->engine->emit_bb_start(rq,
+ batch->node.start, 8,
+ 0);
+ if (err)
+ goto out;
+
+ err = write_timestamp(rq, 3);
+ if (err)
+ goto out;
+
+out:
+ i915_request_get(rq);
+ i915_request_add(rq);
+
+ if (i915_request_wait(rq, 0, HZ / 5) < 0)
+ err = -EIO;
+ i915_request_put(rq);
+ if (err)
+ break;
+
+ cycles[i] = rq->hwsp_seqno[3] - rq->hwsp_seqno[2];
+ }
+ i915_vma_put(batch);
+ if (err)
+ break;
+
+ pr_info("%s: MI_BB_START cycles: %u\n",
+ engine->name, trifilter(cycles));
+ }
+ if (perf_end(gt))
+ err = -EIO;
+
+ return err;
+}
+
+static struct i915_vma *create_nop_batch(struct intel_context *ce)
+{
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ u32 *cs;
+ int err;
+
+ obj = i915_gem_object_create_internal(ce->engine->i915, SZ_64K);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ cs = i915_gem_object_pin_map(obj, I915_MAP_WB);
+ if (IS_ERR(cs)) {
+ i915_gem_object_put(obj);
+ return ERR_CAST(cs);
+ }
+
+ memset(cs, 0, SZ_64K);
+ cs[SZ_64K / sizeof(*cs) - 1] = MI_BATCH_BUFFER_END;
+
+ i915_gem_object_flush_map(obj);
+ i915_gem_object_unpin_map(obj);
+
+ vma = i915_vma_instance(obj, ce->vm, NULL);
+ if (IS_ERR(vma)) {
+ i915_gem_object_put(obj);
+ return vma;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ if (err) {
+ i915_gem_object_put(obj);
+ return ERR_PTR(err);
+ }
+
+ return vma;
+}
+
+static int perf_mi_noop(void *arg)
+{
+ struct intel_gt *gt = arg;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ int err = 0;
+
+ if (INTEL_GEN(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
+ return 0;
+
+ perf_begin(gt);
+ for_each_engine(engine, gt, id) {
+ struct intel_context *ce = engine->kernel_context;
+ struct i915_vma *base, *nop;
+ u32 cycles[COUNT];
+ int i;
+
+ base = create_empty_batch(ce);
+ if (IS_ERR(base)) {
+ err = PTR_ERR(base);
+ break;
+ }
+
+ err = i915_vma_sync(base);
+ if (err) {
+ i915_vma_put(base);
+ break;
+ }
+
+ nop = create_nop_batch(ce);
+ if (IS_ERR(nop)) {
+ err = PTR_ERR(nop);
+ i915_vma_put(base);
+ break;
+ }
+
+ err = i915_vma_sync(nop);
+ if (err) {
+ i915_vma_put(nop);
+ i915_vma_put(base);
+ break;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cycles); i++) {
+ struct i915_request *rq;
+
+ rq = i915_request_create(ce);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ break;
+ }
+
+ err = write_timestamp(rq, 2);
+ if (err)
+ goto out;
+
+ err = rq->engine->emit_bb_start(rq,
+ base->node.start, 8,
+ 0);
+ if (err)
+ goto out;
+
+ err = write_timestamp(rq, 3);
+ if (err)
+ goto out;
+
+ err = rq->engine->emit_bb_start(rq,
+ nop->node.start, 4096,
+ 0);
+ if (err)
+ goto out;
+
+ err = write_timestamp(rq, 4);
+ if (err)
+ goto out;
+
+out:
+ i915_request_get(rq);
+ i915_request_add(rq);
+
+ if (i915_request_wait(rq, 0, HZ / 5) < 0)
+ err = -EIO;
+ i915_request_put(rq);
+ if (err)
+ break;
+
+ cycles[i] =
+ (rq->hwsp_seqno[4] - rq->hwsp_seqno[3]) -
+ (rq->hwsp_seqno[3] - rq->hwsp_seqno[2]);
+ }
+ i915_vma_put(nop);
+ i915_vma_put(base);
+ if (err)
+ break;
+
+ pr_info("%s: 16K MI_NOOP cycles: %u\n",
+ engine->name, trifilter(cycles));
+ }
+ if (perf_end(gt))
+ err = -EIO;
+
+ return err;
+}
+
+int intel_engine_cs_perf_selftests(struct drm_i915_private *i915)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(perf_mi_bb_start),
+ SUBTEST(perf_mi_noop),
+ };
+
+ if (intel_gt_is_wedged(&i915->gt))
+ return 0;
+
+ return intel_gt_live_subtests(tests, &i915->gt);
+}
static int intel_mmio_bases_check(void *arg)
{
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 1bb701d32a5d..da3e9b5752ac 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -1003,6 +1003,12 @@ static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
return err > 0 ? -ENOTTY : err;
}
+ err = i915_perf_selftests(pdev);
+ if (err) {
+ i915_pci_remove(pdev);
+ return err > 0 ? -ENOTTY : err;
+ }
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_selftest.h b/drivers/gpu/drm/i915/i915_selftest.h
index 4d88205de51b..98bcb6fa0ab4 100644
--- a/drivers/gpu/drm/i915/i915_selftest.h
+++ b/drivers/gpu/drm/i915/i915_selftest.h
@@ -36,6 +36,7 @@ struct i915_selftest {
char *filter;
int mock;
int live;
+ int perf;
};
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
@@ -45,6 +46,7 @@ extern struct i915_selftest i915_selftest;
int i915_mock_selftests(void);
int i915_live_selftests(struct pci_dev *pdev);
+int i915_perf_selftests(struct pci_dev *pdev);
/* We extract the function declarations from i915_mock_selftests.h and
* i915_live_selftests.h Add your unit test declarations there!
@@ -61,6 +63,7 @@ int i915_live_selftests(struct pci_dev *pdev);
#undef selftest
#define selftest(name, func) int func(struct drm_i915_private *i915);
#include "selftests/i915_live_selftests.h"
+#include "selftests/i915_perf_selftests.h"
#undef selftest
struct i915_subtest {
@@ -109,6 +112,7 @@ int __i915_subtests(const char *caller,
static inline int i915_mock_selftests(void) { return 0; }
static inline int i915_live_selftests(struct pci_dev *pdev) { return 0; }
+static inline int i915_perf_selftests(struct pci_dev *pdev) { return 0; }
#define I915_SELFTEST_DECLARE(x)
#define I915_SELFTEST_ONLY(x) 0
diff --git a/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
new file mode 100644
index 000000000000..f7129a243daa
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* List each unit test as selftest(name, function)
+ *
+ * The name is used as both an enum and expanded as subtest__name to create
+ * a module parameter. It must be unique and legal for a C identifier.
+ *
+ * The function should be of type int function(void). It may be conditionally
+ * compiled using #if IS_ENABLED(DRM_I915_SELFTEST).
+ *
+ * Tests are executed in order by igt/i915_selftest
+ */
+selftest(engine_cs, intel_engine_cs_perf_selftests)
+selftest(blt, i915_gem_object_blt_perf_selftests)
diff --git a/drivers/gpu/drm/i915/selftests/i915_selftest.c b/drivers/gpu/drm/i915/selftests/i915_selftest.c
index a6cca4ad96f6..d3bf9eefb682 100644
--- a/drivers/gpu/drm/i915/selftests/i915_selftest.c
+++ b/drivers/gpu/drm/i915/selftests/i915_selftest.c
@@ -57,6 +57,12 @@ enum {
#undef selftest
};
+enum {
+#define selftest(name, func) perf_##name,
+#include "i915_perf_selftests.h"
+#undef selftest
+};
+
struct selftest {
bool enabled;
const char *name;
@@ -78,6 +84,12 @@ static struct selftest live_selftests[] = {
};
#undef selftest
+#define selftest(n, f) [perf_##n] = { .name = #n, { .live = f } },
+static struct selftest perf_selftests[] = {
+#include "i915_perf_selftests.h"
+};
+#undef selftest
+
/* Embed the line number into the parameter name so that we can order tests */
#define selftest(n, func) selftest_0(n, func, param(n))
#define param(n) __PASTE(igt__, __PASTE(__LINE__, __mock_##n))
@@ -93,6 +105,13 @@ module_param_named(id, live_selftests[live_##n].enabled, bool, 0400);
#include "i915_live_selftests.h"
#undef selftest_0
#undef param
+
+#define param(n) __PASTE(igt__, __PASTE(__LINE__, __perf_##n))
+#define selftest_0(n, func, id) \
+module_param_named(id, perf_selftests[perf_##n].enabled, bool, 0400);
+#include "i915_perf_selftests.h"
+#undef selftest_0
+#undef param
#undef selftest
static void set_default_test_all(struct selftest *st, unsigned int count)
@@ -200,6 +219,27 @@ int i915_live_selftests(struct pci_dev *pdev)
return 0;
}
+int i915_perf_selftests(struct pci_dev *pdev)
+{
+ int err;
+
+ if (!i915_selftest.perf)
+ return 0;
+
+ err = run_selftests(perf, pdev_to_i915(pdev));
+ if (err) {
+ i915_selftest.perf = err;
+ return err;
+ }
+
+ if (i915_selftest.perf < 0) {
+ i915_selftest.perf = -ENOTTY;
+ return 1;
+ }
+
+ return 0;
+}
+
static bool apply_subtest_filter(const char *caller, const char *name)
{
char *filter, *sep, *tok;
@@ -365,3 +405,6 @@ MODULE_PARM_DESC(mock_selftests, "Run selftests before loading, using mock hardw
module_param_named_unsafe(live_selftests, i915_selftest.live, int, 0400);
MODULE_PARM_DESC(live_selftests, "Run selftests after driver initialisation on the live system (0:disabled [default], 1:run tests then continue, -1:run tests then exit module)");
+
+module_param_named_unsafe(perf_selftests, i915_selftest.perf, int, 0400);
+MODULE_PARM_DESC(perf_selftests, "Run performance orientated selftests after driver initialisation on the live system (0:disabled [default], 1:run tests then continue, -1:run tests then exit module)");
--
2.24.0.rc2
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