[Intel-gfx] [PATCH 1/2] drm/i915/selftests: Add coverage of mocs registers
Chris Wilson
chris at chris-wilson.co.uk
Tue Oct 22 07:51:50 UTC 2019
Probe the mocs registers for new contexts and across GPU resets. Similar
to intel_workarounds, we have tables of what register values we expect
to see, so verify that user contexts are affected by them. In the
future, we should add tests similar to intel_sseu to cover dynamic
reconfigurations.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Prathap Kumar Valsan <prathap.kumar.valsan at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
drivers/gpu/drm/i915/gt/intel_mocs.c | 46 +-
drivers/gpu/drm/i915/gt/selftest_mocs.c | 442 ++++++++++++++++++
.../drm/i915/selftests/i915_live_selftests.h | 1 +
3 files changed, 464 insertions(+), 25 deletions(-)
create mode 100644 drivers/gpu/drm/i915/gt/selftest_mocs.c
diff --git a/drivers/gpu/drm/i915/gt/intel_mocs.c b/drivers/gpu/drm/i915/gt/intel_mocs.c
index 5bac3966906b..f69507fafc21 100644
--- a/drivers/gpu/drm/i915/gt/intel_mocs.c
+++ b/drivers/gpu/drm/i915/gt/intel_mocs.c
@@ -290,44 +290,42 @@ static const struct drm_i915_mocs_entry icelake_mocs_table[] = {
static bool get_mocs_settings(const struct drm_i915_private *i915,
struct drm_i915_mocs_table *table)
{
- bool result = false;
-
if (INTEL_GEN(i915) >= 12) {
table->size = ARRAY_SIZE(tigerlake_mocs_table);
table->table = tigerlake_mocs_table;
table->n_entries = GEN11_NUM_MOCS_ENTRIES;
- result = true;
} else if (IS_GEN(i915, 11)) {
table->size = ARRAY_SIZE(icelake_mocs_table);
table->table = icelake_mocs_table;
table->n_entries = GEN11_NUM_MOCS_ENTRIES;
- result = true;
} else if (IS_GEN9_BC(i915) || IS_CANNONLAKE(i915)) {
table->size = ARRAY_SIZE(skylake_mocs_table);
table->n_entries = GEN9_NUM_MOCS_ENTRIES;
table->table = skylake_mocs_table;
- result = true;
} else if (IS_GEN9_LP(i915)) {
table->size = ARRAY_SIZE(broxton_mocs_table);
table->n_entries = GEN9_NUM_MOCS_ENTRIES;
table->table = broxton_mocs_table;
- result = true;
} else {
WARN_ONCE(INTEL_GEN(i915) >= 9,
"Platform that should have a MOCS table does not.\n");
+ return false;
}
+ if (GEM_DEBUG_WARN_ON(table->size > table->n_entries))
+ return false;
+
/* WaDisableSkipCaching:skl,bxt,kbl,glk */
if (IS_GEN(i915, 9)) {
int i;
for (i = 0; i < table->size; i++)
- if (WARN_ON(table->table[i].l3cc_value &
- (L3_ESC(1) | L3_SCC(0x7))))
+ if (GEM_DEBUG_WARN_ON(table->table[i].l3cc_value &
+ (L3_ESC(1) | L3_SCC(0x7))))
return false;
}
- return result;
+ return true;
}
static i915_reg_t mocs_register(const struct intel_engine_cs *engine, int index)
@@ -396,9 +394,7 @@ static u16 get_entry_l3cc(const struct drm_i915_mocs_table *table,
return table->table[I915_MOCS_PTE].l3cc_value;
}
-static inline u32 l3cc_combine(const struct drm_i915_mocs_table *table,
- u16 low,
- u16 high)
+static inline u32 l3cc_combine(u16 low, u16 high)
{
return low | (u32)high << 16;
}
@@ -414,27 +410,26 @@ static void init_l3cc_table(struct intel_engine_cs *engine,
u16 low = get_entry_l3cc(table, 2 * i);
u16 high = get_entry_l3cc(table, 2 * i + 1);
- intel_uncore_write(uncore,
- GEN9_LNCFCMOCS(i),
- l3cc_combine(table, low, high));
+ intel_uncore_write_fw(uncore,
+ GEN9_LNCFCMOCS(i),
+ l3cc_combine(low, high));
}
/* Odd table size - 1 left over */
if (table->size & 1) {
u16 low = get_entry_l3cc(table, 2 * i);
- intel_uncore_write(uncore,
- GEN9_LNCFCMOCS(i),
- l3cc_combine(table, low, unused_value));
+ intel_uncore_write_fw(uncore,
+ GEN9_LNCFCMOCS(i),
+ l3cc_combine(low, unused_value));
i++;
}
/* All remaining entries are also unused */
for (; i < table->n_entries / 2; i++)
- intel_uncore_write(uncore,
- GEN9_LNCFCMOCS(i),
- l3cc_combine(table, unused_value,
- unused_value));
+ intel_uncore_write_fw(uncore,
+ GEN9_LNCFCMOCS(i),
+ l3cc_combine(unused_value, unused_value));
}
void intel_mocs_init_engine(struct intel_engine_cs *engine)
@@ -466,9 +461,6 @@ static void intel_mocs_init_global(struct intel_gt *gt)
if (!get_mocs_settings(gt->i915, &table))
return;
- if (GEM_DEBUG_WARN_ON(table.size > table.n_entries))
- return;
-
for (index = 0; index < table.size; index++)
intel_uncore_write(uncore,
GEN12_GLOBAL_MOCS(index),
@@ -490,3 +482,7 @@ void intel_mocs_init(struct intel_gt *gt)
if (HAS_GLOBAL_MOCS_REGISTERS(gt->i915))
intel_mocs_init_global(gt);
}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftest_mocs.c"
+#endif
diff --git a/drivers/gpu/drm/i915/gt/selftest_mocs.c b/drivers/gpu/drm/i915/gt/selftest_mocs.c
new file mode 100644
index 000000000000..1f0de0240b0b
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/selftest_mocs.c
@@ -0,0 +1,442 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include "gt/intel_engine_pm.h"
+#include "i915_selftest.h"
+
+#include "gem/selftests/mock_context.h"
+#include "selftests/igt_reset.h"
+#include "selftests/igt_spinner.h"
+
+struct live_mocs {
+ struct drm_i915_mocs_table table;
+ struct i915_vma *scratch;
+ void *vaddr;
+};
+
+static int request_add_sync(struct i915_request *rq, int err)
+{
+ i915_request_get(rq);
+ i915_request_add(rq);
+ if (i915_request_wait(rq, 0, HZ / 5) < 0)
+ err = -ETIME;
+ i915_request_put(rq);
+
+ return err;
+}
+
+static int request_add_spin(struct i915_request *rq, struct igt_spinner *spin)
+{
+ int err = 0;
+
+ i915_request_get(rq);
+ i915_request_add(rq);
+ if (spin && !igt_wait_for_spinner(spin, rq))
+ err = -ETIME;
+ i915_request_put(rq);
+
+ return err;
+}
+
+static struct i915_vma *create_scratch(struct intel_gt *gt)
+{
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ int err;
+
+ obj = i915_gem_object_create_internal(gt->i915, PAGE_SIZE);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ i915_gem_object_set_cache_coherency(obj, I915_CACHING_CACHED);
+
+ vma = i915_vma_instance(obj, >->ggtt->vm, NULL);
+ if (IS_ERR(vma)) {
+ i915_gem_object_put(obj);
+ return vma;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
+ if (err) {
+ i915_gem_object_put(obj);
+ return ERR_PTR(err);
+ }
+
+ return vma;
+}
+
+static int live_mocs_init(struct live_mocs *arg, struct intel_gt *gt)
+{
+ int err;
+
+ if (!get_mocs_settings(gt->i915, &arg->table))
+ return -EINVAL;
+
+ arg->scratch = create_scratch(gt);
+ if (IS_ERR(arg->scratch))
+ return PTR_ERR(arg->scratch);
+
+ arg->vaddr = i915_gem_object_pin_map(arg->scratch->obj, I915_MAP_WB);
+ if (IS_ERR(arg->vaddr)) {
+ err = PTR_ERR(arg->vaddr);
+ goto err_scratch;
+ }
+
+ return 0;
+
+err_scratch:
+ i915_vma_unpin_and_release(&arg->scratch, 0);
+ return err;
+}
+
+static void live_mocs_fini(struct live_mocs *arg)
+{
+ i915_vma_unpin_and_release(&arg->scratch, I915_VMA_RELEASE_MAP);
+}
+
+static int read_mocs_table(struct i915_request *rq,
+ const struct drm_i915_mocs_table *table,
+ uint32_t *offset)
+{
+ unsigned int i;
+ u32 *cs;
+
+ cs = intel_ring_begin(rq, 4 * table->n_entries);
+ if (IS_ERR(cs))
+ return PTR_ERR(cs);
+
+ for (i = 0; i < table->n_entries; i++) {
+ GEM_BUG_ON(!IS_ALIGNED(*offset, sizeof(u32)));
+ *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
+ *cs++ = i915_mmio_reg_offset(HAS_GLOBAL_MOCS_REGISTERS(rq->i915) ?
+ GEN12_GLOBAL_MOCS(i) :
+ mocs_register(rq->engine, i));
+ *cs++ = *offset;
+ *cs++ = 0;
+ *offset += sizeof(u32);
+ }
+
+ intel_ring_advance(rq, cs);
+
+ return 0;
+}
+
+static int read_l3cc_table(struct i915_request *rq,
+ const struct drm_i915_mocs_table *table,
+ uint32_t *offset)
+{
+ unsigned int i;
+ u32 *cs;
+
+ cs = intel_ring_begin(rq, (table->n_entries + 1) / 2 * 4);
+ if (IS_ERR(cs))
+ return PTR_ERR(cs);
+
+ /* Can we read the MCR range 0xb00 directly? See intel_workarounds! */
+ for (i = 0; i < (table->n_entries + 1) / 2; i++) {
+ GEM_BUG_ON(!IS_ALIGNED(*offset, sizeof(u32)));
+ *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
+ *cs++ = i915_mmio_reg_offset(GEN9_LNCFCMOCS(i));
+ *cs++ = *offset;
+ *cs++ = 0;
+ *offset += sizeof(u32);
+ }
+
+ intel_ring_advance(rq, cs);
+
+ return 0;
+}
+
+static int check_mocs_table(struct intel_engine_cs *engine,
+ const struct drm_i915_mocs_table *table,
+ uint32_t **vaddr)
+{
+ unsigned int i;
+ u32 expect;
+
+ for (i = 0; i < table->size; i++) {
+ if (HAS_GLOBAL_MOCS_REGISTERS(engine->i915))
+ expect = table->table[i].control_value;
+ else
+ expect = get_entry_control(table, i);
+ if (**vaddr != expect) {
+ pr_err("%s: Invalid MOCS[%d] entry, found %08x, expected %08x\n",
+ engine->name, i, **vaddr, expect);
+ return -EINVAL;
+ }
+ ++*vaddr;
+ }
+
+ /* All remaining entries are default */
+ if (HAS_GLOBAL_MOCS_REGISTERS(engine->i915))
+ expect = table->table[0].control_value;
+ else
+ expect = table->table[I915_MOCS_PTE].control_value;
+ for (; i < table->n_entries; i++) {
+ if (**vaddr != expect) {
+ pr_err("%s: Invalid MOCS[%d*] entry, found %08x, expected %08x\n",
+ engine->name, i, **vaddr, expect);
+ return -EINVAL;
+ }
+ ++*vaddr;
+ }
+
+ return 0;
+}
+
+static int check_l3cc_table(struct intel_engine_cs *engine,
+ const struct drm_i915_mocs_table *table,
+ uint32_t **vaddr)
+{
+ u16 unused_value = table->table[I915_MOCS_PTE].l3cc_value;
+ unsigned int i;
+ u32 expect;
+
+ for (i = 0; i < table->size / 2; i++) {
+ u16 low = get_entry_l3cc(table, 2 * i);
+ u16 high = get_entry_l3cc(table, 2 * i + 1);
+
+ expect = l3cc_combine(low, high);
+ if (**vaddr != expect) {
+ pr_err("%s: Invalid L3CC[%d] entry, found %08x, expected %08x\n",
+ engine->name, i, **vaddr, expect);
+ return -EINVAL;
+ }
+ ++*vaddr;
+ }
+
+ /* Odd table size - 1 left over */
+ if (table->size & 1) {
+ u16 low = get_entry_l3cc(table, 2 * i);
+
+ expect = l3cc_combine(low, unused_value);
+ if (**vaddr != expect) {
+ pr_err("%s: Invalid L3CC[%d+] entry, found %08x, expected %08x\n",
+ engine->name, i, **vaddr, expect);
+ return -EINVAL;
+ }
+ ++*vaddr;
+ i++;
+ }
+
+ /* All remaining entries are also unused */
+ expect = l3cc_combine(unused_value, unused_value);
+ for (; i < (table->n_entries + 1) / 2; i++) {
+ if (**vaddr != expect) {
+ pr_err("%s: Invalid L3CC[%d*] entry, found %08x, expected %08x\n",
+ engine->name, i, **vaddr, expect);
+ return -EINVAL;
+ }
+ ++*vaddr;
+ }
+
+ return 0;
+}
+
+static int check_mocs_engine(struct live_mocs *arg,
+ struct intel_context *ce)
+{
+ struct i915_vma *vma = arg->scratch;
+ struct i915_request *rq;
+ uint32_t offset;
+ uint32_t *vaddr;
+ int err;
+
+ memset32(arg->vaddr, STACK_MAGIC, PAGE_SIZE / sizeof(u32));
+
+ rq = intel_context_create_request(ce);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ i915_vma_lock(vma);
+ err = i915_request_await_object(rq, vma->obj, true);
+ if (!err)
+ err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
+ i915_vma_unlock(vma);
+
+ offset = i915_ggtt_offset(vma);
+ if (!err)
+ err = read_mocs_table(rq, &arg->table, &offset);
+ if (!err && ce->engine->class == RENDER_CLASS)
+ err = read_l3cc_table(rq, &arg->table, &offset);
+ offset -= i915_ggtt_offset(vma);
+ GEM_BUG_ON(offset > PAGE_SIZE);
+
+ err = request_add_sync(rq, err);
+ if (err)
+ return err;
+
+ vaddr = arg->vaddr;
+ if (!err)
+ err = check_mocs_table(ce->engine, &arg->table, &vaddr);
+ if (!err && ce->engine->class == RENDER_CLASS)
+ err = check_l3cc_table(ce->engine, &arg->table, &vaddr);
+ if (err)
+ return err;
+
+ GEM_BUG_ON(arg->vaddr + offset != vaddr);
+ return 0;
+}
+
+static int live_mocs_kernel(void *arg)
+{
+ struct intel_gt *gt = arg;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ struct live_mocs mocs;
+ int err;
+
+ err = live_mocs_init(&mocs, gt);
+ if (err)
+ return err;
+
+ for_each_engine(engine, gt, id) {
+ err = check_mocs_engine(&mocs, engine->kernel_context);
+ if (err)
+ break;
+ }
+
+ live_mocs_fini(&mocs);
+ return err;
+}
+
+static int live_mocs_clean(void *arg)
+{
+ struct intel_gt *gt = arg;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ struct live_mocs mocs;
+ int err;
+
+ err = live_mocs_init(&mocs, gt);
+ if (err)
+ return err;
+
+ for_each_engine(engine, gt, id) {
+ struct intel_context *ce;
+
+ ce = intel_context_create(engine->kernel_context->gem_context,
+ engine);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ break;
+ }
+
+ err = check_mocs_engine(&mocs, ce);
+ intel_context_put(ce);
+ if (err)
+ break;
+ }
+
+ live_mocs_fini(&mocs);
+ return err;
+}
+
+static int active_engine_reset(struct intel_context *ce,
+ const char *reason)
+{
+ struct igt_spinner spin;
+ struct i915_request *rq;
+ int err;
+
+ err = igt_spinner_init(&spin, ce->engine->gt);
+ if (err)
+ return err;
+
+ rq = igt_spinner_create_request(&spin, ce, MI_NOOP);
+ if (IS_ERR(rq)) {
+ igt_spinner_fini(&spin);
+ return PTR_ERR(rq);
+ }
+
+ err = request_add_spin(rq, &spin);
+ if (err == 0)
+ err = intel_engine_reset(ce->engine, reason);
+
+ igt_spinner_end(&spin);
+ igt_spinner_fini(&spin);
+
+ return err;
+}
+
+static int __live_mocs_reset(struct live_mocs *mocs,
+ struct intel_context *ce)
+{
+ int err;
+
+ err = intel_engine_reset(ce->engine, "mocs");
+ if (err)
+ return err;
+
+ err = check_mocs_engine(mocs, ce);
+ if (err)
+ return err;
+
+ err = active_engine_reset(ce, "mocs");
+ if (err)
+ return err;
+
+ err = check_mocs_engine(mocs, ce);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int live_mocs_reset(void *arg)
+{
+ struct intel_gt *gt = arg;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ struct live_mocs mocs;
+ int err = 0;
+
+ if (!intel_has_reset_engine(gt))
+ return 0;
+
+ err = live_mocs_init(&mocs, gt);
+ if (err)
+ return err;
+
+ igt_global_reset_lock(gt);
+ for_each_engine(engine, gt, id) {
+ struct intel_context *ce;
+
+ ce = intel_context_create(engine->kernel_context->gem_context,
+ engine);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ break;
+ }
+
+ intel_engine_pm_get(engine);
+ err = __live_mocs_reset(&mocs, ce);
+ intel_engine_pm_put(engine);
+
+ intel_context_put(ce);
+ if (err)
+ break;
+ }
+ igt_global_reset_unlock(gt);
+
+ live_mocs_fini(&mocs);
+ return err;
+}
+
+int intel_mocs_live_selftests(struct drm_i915_private *i915)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(live_mocs_kernel),
+ SUBTEST(live_mocs_clean),
+ SUBTEST(live_mocs_reset),
+ };
+ struct drm_i915_mocs_table table;
+
+ if (!get_mocs_settings(i915, &table))
+ return 0;
+
+ return intel_gt_live_subtests(tests, &i915->gt);
+}
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index 00a063730bc3..c23d06bca09e 100644
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -16,6 +16,7 @@ selftest(gt_engines, intel_engine_live_selftests)
selftest(gt_timelines, intel_timeline_live_selftests)
selftest(gt_contexts, intel_context_live_selftests)
selftest(gt_lrc, intel_lrc_live_selftests)
+selftest(gt_mocs, intel_mocs_live_selftests)
selftest(gt_pm, intel_gt_pm_live_selftests)
selftest(gt_heartbeat, intel_heartbeat_live_selftests)
selftest(requests, i915_request_live_selftests)
--
2.24.0.rc0
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