[Intel-gfx] [PATCH 01/19] drm/i915/perf: Fix OA filtering logic for GuC mode

Umesh Nerlige Ramappa
2022-08-23T00:05:02Z

With GuC mode of submission, GuC is in control of defining the context id field
that is part of the OA reports. To filter reports, UMD and KMD must know what sw
context id was chosen by GuC. There is not interface between KMD and GuC to
determine this, so read the upper-dword of EXECLIST_STATUS to filter/squash OA
reports for the specific context.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
drivers/gpu/drm/i915/gt/intel_lrc.h | 2 +
drivers/gpu/drm/i915/i915_perf.c | 141 ++++++++++++++++++++++++----
2 files changed, 124 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.h b/drivers/gpu/drm/i915/gt/intel_lrc.h
index a390f0813c8b..7111bae759f3 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.h
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.h
@@ -110,6 +110,8 @@ enum {
#define XEHP_SW_CTX_ID_WIDTH 16
#define XEHP_SW_COUNTER_SHIFT 58
#define XEHP_SW_COUNTER_WIDTH 6
+#define GEN12_GUC_SW_CTX_ID_SHIFT 39
+#define GEN12_GUC_SW_CTX_ID_WIDTH 16

static inline void lrc_runtime_start(struct intel_context *ce)
{
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index f3c23fe9ad9c..735244a3aedd 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1233,6 +1233,125 @@ static struct intel_context *oa_pin_context(struct i915_perf_stream *stream)
return stream->pinned_ctx;
}

+static int
+__store_reg_to_mem(struct i915_request *rq, i915_reg_t reg, u32 ggtt_offset)
+{
+ u32 *cs, cmd;
+
+ cmd = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
+ if (GRAPHICS_VER(rq->engine->i915) >= 8)
+ cmd++;
+
+ cs = intel_ring_begin(rq, 4);
+ if (IS_ERR(cs))
+ return PTR_ERR(cs);
+
+ *cs++ = cmd;
+ *cs++ = i915_mmio_reg_offset(reg);
+ *cs++ = ggtt_offset;
+ *cs++ = 0;
+
+ intel_ring_advance(rq, cs);
+
+ return 0;
+}
+
+static int
+__read_reg(struct intel_context *ce, i915_reg_t reg, u32 ggtt_offset)
+{
+ struct i915_request *rq;
+ int err;
+
+ rq = i915_request_create(ce);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ i915_request_get(rq);
+
+ err = __store_reg_to_mem(rq, reg, ggtt_offset);
+
+ i915_request_add(rq);
+ if (!err && i915_request_wait(rq, 0, HZ / 2) < 0)
+ err = -ETIME;
+
+ i915_request_put(rq);
+
+ return err;
+}
+
+static int
+gen12_guc_sw_ctx_id(struct intel_context *ce, u32 *ctx_id)
+{
+ struct i915_vma *scratch;
+ u32 *val;
+ int err;
+
+ scratch = __vm_create_scratch_for_read_pinned(&ce->engine->gt->ggtt->vm, 4);
+ if (IS_ERR(scratch))
+ return PTR_ERR(scratch);
+
+ err = i915_vma_sync(scratch);
+ if (err)
+ goto err_scratch;
+
+ err = __read_reg(ce, RING_EXECLIST_STATUS_HI(ce->engine->mmio_base),
+ i915_ggtt_offset(scratch));
+ if (err)
+ goto err_scratch;
+
+ val = i915_gem_object_pin_map_unlocked(scratch->obj, I915_MAP_WB);
+ if (IS_ERR(val)) {
+ err = PTR_ERR(val);
+ goto err_scratch;
+ }
+
+ *ctx_id = *val;
+ i915_gem_object_unpin_map(scratch->obj);
+
+err_scratch:
+ i915_vma_unpin_and_release(&scratch, 0);
+ return err;
+}
+
+/*
+ * For execlist mode of submission, pick an unused context id
+ * 0 - (NUM_CONTEXT_TAG -1) are used by other contexts
+ * XXX_MAX_CONTEXT_HW_ID is used by idle context
+ *
+ * For GuC mode of submission read context id from the upper dword of the
+ * EXECLIST_STATUS register.
+ */
+static int gen12_get_render_context_id(struct i915_perf_stream *stream)
+{
+ u32 ctx_id, mask;
+ int ret;
+
+ if (intel_engine_uses_guc(stream->engine)) {
+ ret = gen12_guc_sw_ctx_id(stream->pinned_ctx, &ctx_id);
+ if (ret)
+ return ret;
+
+ mask = ((1U << GEN12_GUC_SW_CTX_ID_WIDTH) - 1) <<
+ (GEN12_GUC_SW_CTX_ID_SHIFT - 32);
+ } else if (GRAPHICS_VER_FULL(stream->engine->i915) >= IP_VER(12, 50)) {
+ ctx_id = (XEHP_MAX_CONTEXT_HW_ID - 1) <<
+ (XEHP_SW_CTX_ID_SHIFT - 32);
+
+ mask = ((1U << XEHP_SW_CTX_ID_WIDTH) - 1) <<
+ (XEHP_SW_CTX_ID_SHIFT - 32);
+ } else {
+ ctx_id = (GEN12_MAX_CONTEXT_HW_ID - 1) <<
+ (GEN11_SW_CTX_ID_SHIFT - 32);
+
+ mask = ((1U << GEN11_SW_CTX_ID_WIDTH) - 1) <<
+ (GEN11_SW_CTX_ID_SHIFT - 32);
+ }
+ stream->specific_ctx_id = ctx_id & mask;
+ stream->specific_ctx_id_mask = mask;
+
+ return 0;
+}
+
/**
* oa_get_render_ctx_id - determine and hold ctx hw id
* @stream: An i915-perf stream opened for OA metrics
@@ -1246,6 +1365,7 @@ static struct intel_context *oa_pin_context(struct i915_perf_stream *stream)
static int oa_get_render_ctx_id(struct i915_perf_stream *stream)
{
struct intel_context *ce;
+ int ret = 0;

ce = oa_pin_context(stream);
if (IS_ERR(ce))
@@ -1292,24 +1412,7 @@ static int oa_get_render_ctx_id(struct i915_perf_stream *stream)

case 11:
case 12:
- if (GRAPHICS_VER_FULL(ce->engine->i915) >= IP_VER(12, 50)) {
- stream->specific_ctx_id_mask =
- ((1U << XEHP_SW_CTX_ID_WIDTH) - 1) <<
- (XEHP_SW_CTX_ID_SHIFT - 32);
- stream->specific_ctx_id =
- (XEHP_MAX_CONTEXT_HW_ID - 1) <<
- (XEHP_SW_CTX_ID_SHIFT - 32);
- } else {
- stream->specific_ctx_id_mask =
- ((1U << GEN11_SW_CTX_ID_WIDTH) - 1) << (GEN11_SW_CTX_ID_SHIFT - 32);
- /*
- * Pick an unused context id
- * 0 - BITS_PER_LONG are used by other contexts
- * GEN12_MAX_CONTEXT_HW_ID (0x7ff) is used by idle context
- */
- stream->specific_ctx_id =
- (GEN12_MAX_CONTEXT_HW_ID - 1) << (GEN11_SW_CTX_ID_SHIFT - 32);
- }
+ ret = gen12_get_render_context_id(stream);
break;

default:
@@ -1323,7 +1426,7 @@ static int oa_get_render_ctx_id(struct i915_perf_stream *stream)
stream->specific_ctx_id,
stream->specific_ctx_id_mask);

- return 0;
+ return ret;
}

/**
--
2.25.1