From 7069b1448997785765db97eecd64037d2767680c Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 28 Apr 2016 09:56:52 +0100 Subject: [PATCH] drm/i915: Replace the pinned context address with its unique ID Rather than reuse the current location of the context in the global GTT for its hardware identifier, use the context's unique ID assigned to it for its whole lifetime. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-18-git-send-email-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_debugfs.c | 12 ++++----- drivers/gpu/drm/i915/intel_lrc.c | 39 +++++++---------------------- drivers/gpu/drm/i915/intel_lrc.h | 3 --- 3 files changed, 14 insertions(+), 40 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index e35d0cc16e03..fbf26d6c7d25 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -2043,15 +2043,13 @@ static void i915_dump_lrc_obj(struct seq_file *m, struct drm_i915_gem_object *ctx_obj = ctx->engine[engine->id].state; unsigned long ggtt_offset = 0; + seq_printf(m, "CONTEXT: %s %u\n", engine->name, ctx->hw_id); + if (ctx_obj == NULL) { - seq_printf(m, "Context on %s with no gem object\n", - engine->name); + seq_puts(m, "\tNot allocated\n"); return; } - seq_printf(m, "CONTEXT: %s %u\n", engine->name, - intel_execlists_ctx_id(ctx, engine)); - if (!i915_gem_obj_ggtt_bound(ctx_obj)) seq_puts(m, "\tNot bound in GGTT\n"); else @@ -2170,8 +2168,8 @@ static int i915_execlists(struct seq_file *m, void *data) seq_printf(m, "\t%d requests in queue\n", count); if (head_req) { - seq_printf(m, "\tHead request id: %u\n", - intel_execlists_ctx_id(head_req->ctx, engine)); + seq_printf(m, "\tHead request context: %u\n", + head_req->ctx->hw_id); seq_printf(m, "\tHead request tail: %u\n", head_req->tail); } diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 217874198001..3baa458d4571 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -224,6 +224,7 @@ enum { FAULT_AND_CONTINUE /* Unsupported */ }; #define GEN8_CTX_ID_SHIFT 32 +#define GEN8_CTX_ID_WIDTH 21 #define GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x17 #define GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x26 @@ -307,7 +308,7 @@ logical_ring_init_platform_invariants(struct intel_engine_cs *engine) * This is what a descriptor looks like, from LSB to MSB: * bits 0-11: flags, GEN8_CTX_* (cached in ctx_desc_template) * bits 12-31: LRCA, GTT address of (the HWSP of) this context - * bits 32-52: ctx ID, a globally unique tag (the LRCA again!) + * bits 32-52: ctx ID, a globally unique tag * bits 53-54: mbz, reserved for use by hardware * bits 55-63: group ID, currently unused and set to 0 */ @@ -315,14 +316,14 @@ static void intel_lr_context_descriptor_update(struct intel_context *ctx, struct intel_engine_cs *engine) { - uint64_t lrca, desc; + u64 desc; - lrca = ctx->engine[engine->id].lrc_vma->node.start + - LRC_PPHWSP_PN * PAGE_SIZE; + BUILD_BUG_ON(MAX_CONTEXT_HW_ID > (1<ctx_desc_template; /* bits 0-11 */ - desc |= lrca; /* bits 12-31 */ - desc |= (lrca >> PAGE_SHIFT) << GEN8_CTX_ID_SHIFT; /* bits 32-52 */ + desc = engine->ctx_desc_template; /* bits 0-11 */ + desc |= ctx->engine[engine->id].lrc_vma->node.start + /* bits 12-31 */ + LRC_PPHWSP_PN * PAGE_SIZE; + desc |= (u64)ctx->hw_id << GEN8_CTX_ID_SHIFT; /* bits 32-52 */ ctx->engine[engine->id].lrc_desc = desc; } @@ -333,28 +334,6 @@ uint64_t intel_lr_context_descriptor(struct intel_context *ctx, return ctx->engine[engine->id].lrc_desc; } -/** - * intel_execlists_ctx_id() - get the Execlists Context ID - * @ctx: Context to get the ID for - * @ring: Engine to get the ID for - * - * Do not confuse with ctx->id! Unfortunately we have a name overload - * here: the old context ID we pass to userspace as a handler so that - * they can refer to a context, and the new context ID we pass to the - * ELSP so that the GPU can inform us of the context status via - * interrupts. - * - * The context ID is a portion of the context descriptor, so we can - * just extract the required part from the cached descriptor. - * - * Return: 20-bits globally unique context ID. - */ -u32 intel_execlists_ctx_id(struct intel_context *ctx, - struct intel_engine_cs *engine) -{ - return intel_lr_context_descriptor(ctx, engine) >> GEN8_CTX_ID_SHIFT; -} - static void execlists_elsp_write(struct drm_i915_gem_request *rq0, struct drm_i915_gem_request *rq1) { @@ -500,7 +479,7 @@ execlists_check_remove_request(struct intel_engine_cs *engine, u32 request_id) if (!head_req) return 0; - if (unlikely(intel_execlists_ctx_id(head_req->ctx, engine) != request_id)) + if (unlikely(head_req->ctx->hw_id != request_id)) return 0; WARN(head_req->elsp_submitted == 0, "Never submitted head request\n"); diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h index 60a7385bc531..9510826f0d90 100644 --- a/drivers/gpu/drm/i915/intel_lrc.h +++ b/drivers/gpu/drm/i915/intel_lrc.h @@ -113,9 +113,6 @@ void intel_lr_context_reset(struct drm_i915_private *dev_priv, uint64_t intel_lr_context_descriptor(struct intel_context *ctx, struct intel_engine_cs *engine); -u32 intel_execlists_ctx_id(struct intel_context *ctx, - struct intel_engine_cs *engine); - /* Execlists */ int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists); struct i915_execbuffer_params; -- 2.20.1