[Intel-gfx] [PATCH v11 2/4] drm/i915/perf: stop using the kernel context
Lionel Landwerlin
lionel.g.landwerlin at intel.com
Mon May 4 10:31:44 UTC 2020
Chris doesn't like that.
v2: Don't forget to configure the kernel so that periodic reports are
written appropriately (Lionel)
v3: Keep the configuration context pinned for the lifecycle of
i915_perf_stream (Chris)
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
---
drivers/gpu/drm/i915/i915_perf.c | 153 +++++++++++++++++--------
drivers/gpu/drm/i915/i915_perf_types.h | 10 +-
2 files changed, 113 insertions(+), 50 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index c17696058c20..44148b705a5a 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1354,9 +1354,31 @@ free_noa_wait(struct i915_perf_stream *stream)
i915_vma_unpin_and_release(&stream->noa_wait, 0);
}
+static int i915_perf_stream_sync(struct i915_perf_stream *stream,
+ bool enable)
+{
+ struct i915_active *active;
+ int err = 0;
+
+ active = i915_active_create();
+ if (!active)
+ return -ENOMEM;
+
+ if (enable)
+ err = stream->perf->ops.enable_metric_set(stream, active);
+ else
+ stream->perf->ops.disable_metric_set(stream, active);
+ if (err == 0)
+ __i915_active_wait(active, TASK_UNINTERRUPTIBLE);
+
+ i915_active_put(active);
+ return err;
+}
+
static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
{
struct i915_perf *perf = stream->perf;
+ int err;
BUG_ON(stream != perf->exclusive_stream);
@@ -1367,7 +1389,14 @@ static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
* See i915_oa_init_reg_state() and lrc_configure_all_contexts()
*/
WRITE_ONCE(perf->exclusive_stream, NULL);
- perf->ops.disable_metric_set(stream);
+ err = i915_perf_stream_sync(stream, false /* enable */);
+ if (err) {
+ drm_err(&perf->i915->drm,
+ "Error while disabling OA stream\n");
+ }
+
+ intel_context_unpin(stream->config_context);
+ intel_context_put(stream->config_context);
free_oa_buffer(stream);
@@ -2011,11 +2040,6 @@ emit_oa_config(struct i915_perf_stream *stream,
return err;
}
-static struct intel_context *oa_context(struct i915_perf_stream *stream)
-{
- return stream->pinned_ctx ?: stream->engine->kernel_context;
-}
-
static int
hsw_enable_metric_set(struct i915_perf_stream *stream,
struct i915_active *active)
@@ -2038,13 +2062,14 @@ hsw_enable_metric_set(struct i915_perf_stream *stream,
0, GEN6_CSUNIT_CLOCK_GATE_DISABLE);
return emit_oa_config(stream, stream->oa_config,
- oa_context(stream),
+ stream->config_context,
active,
BIT(I915_OA_CONFIG_PART_GLOBAL) |
BIT(I915_OA_CONFIG_PART_PER_CONTEXT));
}
-static void hsw_disable_metric_set(struct i915_perf_stream *stream)
+static void hsw_disable_metric_set(struct i915_perf_stream *stream,
+ struct i915_active *active)
{
struct intel_uncore *uncore = stream->uncore;
@@ -2169,13 +2194,14 @@ gen8_load_flex(struct i915_request *rq,
return 0;
}
-static int gen8_modify_context(struct intel_context *ce,
+static int gen8_modify_context(struct i915_perf_stream *stream,
+ struct intel_context *ce,
const struct flex *flex, unsigned int count)
{
struct i915_request *rq;
int err;
- rq = intel_engine_create_kernel_request(ce->engine);
+ rq = intel_context_create_request(stream->config_context);
if (IS_ERR(rq))
return PTR_ERR(rq);
@@ -2217,7 +2243,8 @@ gen8_modify_self(struct intel_context *ce,
return err;
}
-static int gen8_configure_context(struct i915_gem_context *ctx,
+static int gen8_configure_context(struct i915_perf_stream *stream,
+ struct i915_gem_context *ctx,
struct flex *flex, unsigned int count)
{
struct i915_gem_engines_iter it;
@@ -2235,7 +2262,7 @@ static int gen8_configure_context(struct i915_gem_context *ctx,
continue;
flex->value = intel_sseu_make_rpcs(ctx->i915, &ce->sseu);
- err = gen8_modify_context(ce, flex, count);
+ err = gen8_modify_context(stream, ce, flex, count);
intel_context_unpin(ce);
if (err)
@@ -2285,7 +2312,7 @@ static int gen12_configure_oar_context(struct i915_perf_stream *stream,
if (err)
return err;
- err = gen8_modify_context(ce, regs_context, ARRAY_SIZE(regs_context));
+ err = gen8_modify_context(stream, ce, regs_context, ARRAY_SIZE(regs_context));
intel_context_unlock_pinned(ce);
if (err)
return err;
@@ -2328,6 +2355,7 @@ oa_configure_all_contexts(struct i915_perf_stream *stream,
struct drm_i915_private *i915 = stream->perf->i915;
struct intel_engine_cs *engine;
struct i915_gem_context *ctx, *cn;
+ struct intel_context *kernel_context;
int err;
lockdep_assert_held(&stream->perf->lock);
@@ -2355,7 +2383,7 @@ oa_configure_all_contexts(struct i915_perf_stream *stream,
spin_unlock(&i915->gem.contexts.lock);
- err = gen8_configure_context(ctx, regs, num_regs);
+ err = gen8_configure_context(stream, ctx, regs, num_regs);
if (err) {
i915_gem_context_put(ctx);
return err;
@@ -2368,12 +2396,23 @@ oa_configure_all_contexts(struct i915_perf_stream *stream,
spin_unlock(&i915->gem.contexts.lock);
/*
- * After updating all other contexts, we need to modify ourselves.
- * If we don't modify the kernel_context, we do not get events while
- * idle.
+ * Modify the kernel context has this is where we're parked, we want
+ * the periodic ticking on idle to be consistent with what the perf
+ * stream was configured with.
+ */
+ kernel_context = stream->engine->kernel_context;
+ regs[0].value = intel_sseu_make_rpcs(i915, &kernel_context->sseu);
+ err = gen8_modify_context(stream, kernel_context, regs, num_regs);
+ if (err)
+ return err;
+
+ /*
+ * After updating all other contexts, we need to modify ourselves. If
+ * we don't modify the stream->perf_context, we do not get events
+ * while idle.
*/
for_each_uabi_engine(engine, i915) {
- struct intel_context *ce = engine->kernel_context;
+ struct intel_context *ce = stream->config_context;
if (engine->class != RENDER_CLASS)
continue;
@@ -2492,8 +2531,9 @@ gen8_enable_metric_set(struct i915_perf_stream *stream,
if (err)
return err;
- return emit_oa_config(stream, oa_config,
- oa_context(stream),
+
+ return emit_oa_config(stream, stream->oa_config,
+ stream->config_context,
active,
BIT(I915_OA_CONFIG_PART_GLOBAL) |
BIT(I915_OA_CONFIG_PART_PER_CONTEXT));
@@ -2552,44 +2592,47 @@ gen12_enable_metric_set(struct i915_perf_stream *stream,
return ret;
}
- return emit_oa_config(stream, oa_config,
- oa_context(stream),
+ return emit_oa_config(stream, stream->oa_config,
+ stream->config_context,
active,
BIT(I915_OA_CONFIG_PART_GLOBAL) |
BIT(I915_OA_CONFIG_PART_PER_CONTEXT));
}
-static void gen8_disable_metric_set(struct i915_perf_stream *stream)
+static void gen8_disable_metric_set(struct i915_perf_stream *stream,
+ struct i915_active *active)
{
struct intel_uncore *uncore = stream->uncore;
/* Reset all contexts' slices/subslices configurations. */
- lrc_configure_all_contexts(stream, NULL, NULL);
+ lrc_configure_all_contexts(stream, NULL, active);
intel_uncore_rmw(uncore, GDT_CHICKEN_BITS, GT_NOA_ENABLE, 0);
}
-static void gen10_disable_metric_set(struct i915_perf_stream *stream)
+static void gen10_disable_metric_set(struct i915_perf_stream *stream,
+ struct i915_active *active)
{
struct intel_uncore *uncore = stream->uncore;
/* Reset all contexts' slices/subslices configurations. */
- lrc_configure_all_contexts(stream, NULL, NULL);
+ lrc_configure_all_contexts(stream, NULL, active);
/* Make sure we disable noa to save power. */
intel_uncore_rmw(uncore, RPM_CONFIG1, GEN10_GT_NOA_ENABLE, 0);
}
-static void gen12_disable_metric_set(struct i915_perf_stream *stream)
+static void gen12_disable_metric_set(struct i915_perf_stream *stream,
+ struct i915_active *active)
{
struct intel_uncore *uncore = stream->uncore;
/* Reset all contexts' slices/subslices configurations. */
- gen12_configure_all_contexts(stream, NULL, NULL);
+ gen12_configure_all_contexts(stream, NULL, active);
/* disable the context save/restore or OAR counters */
if (stream->ctx)
- gen12_configure_oar_context(stream, NULL);
+ gen12_configure_oar_context(stream, active);
/* Make sure we disable noa to save power. */
intel_uncore_rmw(uncore, RPM_CONFIG1, GEN10_GT_NOA_ENABLE, 0);
@@ -2761,23 +2804,6 @@ static const struct i915_perf_stream_ops i915_oa_stream_ops = {
.read = i915_oa_read,
};
-static int i915_perf_stream_enable_sync(struct i915_perf_stream *stream)
-{
- struct i915_active *active;
- int err;
-
- active = i915_active_create();
- if (!active)
- return -ENOMEM;
-
- err = stream->perf->ops.enable_metric_set(stream, active);
- if (err == 0)
- __i915_active_wait(active, TASK_UNINTERRUPTIBLE);
-
- i915_active_put(active);
- return err;
-}
-
static void
get_default_sseu_config(struct intel_sseu *out_sseu,
struct intel_engine_cs *engine)
@@ -2835,6 +2861,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
{
struct drm_i915_private *i915 = stream->perf->i915;
struct i915_perf *perf = stream->perf;
+ struct intel_timeline *timeline;
int format_size;
int ret;
@@ -2944,10 +2971,30 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
stream->ops = &i915_oa_stream_ops;
+ timeline = intel_timeline_create(stream->engine->gt, NULL);
+ if (IS_ERR(timeline)) {
+ ret = PTR_ERR(timeline);
+ goto err_timeline;
+ }
+
+ stream->config_context = intel_context_create(stream->engine);
+ if (IS_ERR(stream->config_context)) {
+ intel_timeline_put(timeline);
+ ret = PTR_ERR(stream->config_context);
+ goto err_timeline;
+ }
+
+ stream->config_context->sseu = props->sseu;
+ stream->config_context->timeline = timeline;
+
+ ret = intel_context_pin(stream->config_context);
+ if (ret)
+ goto err_context_pin;
+
perf->sseu = props->sseu;
WRITE_ONCE(perf->exclusive_stream, stream);
- ret = i915_perf_stream_enable_sync(stream);
+ ret = i915_perf_stream_sync(stream, true /* enable */);
if (ret) {
DRM_DEBUG("Unable to enable metric set\n");
goto err_enable;
@@ -2966,8 +3013,14 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
err_enable:
WRITE_ONCE(perf->exclusive_stream, NULL);
- perf->ops.disable_metric_set(stream);
+ i915_perf_stream_sync(stream, false /* enable */);
+ intel_context_unpin(stream->config_context);
+
+err_context_pin:
+ intel_context_put(stream->config_context);
+
+err_timeline:
free_oa_buffer(stream);
err_oa_buf_alloc:
@@ -3219,6 +3272,8 @@ static long i915_perf_config_locked(struct i915_perf_stream *stream,
return -EINVAL;
if (config != stream->oa_config) {
+ struct intel_context *ce = stream->pinned_ctx ?: stream->config_context;
+
active = i915_active_create();
if (!active) {
ret = -ENOMEM;
@@ -3235,7 +3290,7 @@ static long i915_perf_config_locked(struct i915_perf_stream *stream,
* so it will effectively take effect when idle.
*/
ret = emit_oa_config(stream, config,
- oa_context(stream),
+ ce,
active,
BIT(I915_OA_CONFIG_PART_GLOBAL) |
BIT(I915_OA_CONFIG_PART_PER_CONTEXT));
diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h
index a36a455ae336..a8b903592a39 100644
--- a/drivers/gpu/drm/i915/i915_perf_types.h
+++ b/drivers/gpu/drm/i915/i915_perf_types.h
@@ -16,6 +16,7 @@
#include <linux/uuid.h>
#include <linux/wait.h>
+#include "gt/intel_context_types.h"
#include "gt/intel_sseu.h"
#include "i915_reg.h"
#include "intel_wakeref.h"
@@ -311,6 +312,12 @@ struct i915_perf_stream {
* buffer should be checked for available data.
*/
u64 poll_oa_period;
+
+ /**
+ * @config_context: A logical context for use by the perf stream for
+ * configuring the HW.
+ */
+ struct intel_context *config_context;
};
/**
@@ -348,7 +355,8 @@ struct i915_oa_ops {
* @disable_metric_set: Remove system constraints associated with using
* the OA unit.
*/
- void (*disable_metric_set)(struct i915_perf_stream *stream);
+ void (*disable_metric_set)(struct i915_perf_stream *stream,
+ struct i915_active *active);
/**
* @oa_enable: Enable periodic sampling
--
2.26.2
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