From 604a8f6f1e33ed53529a117baec92d28e746a601 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 21 Sep 2017 14:54:43 +0100 Subject: [PATCH] drm/i915/lrc: Only enable per-context and per-bb buffers if set The per-context and per-batch workaround buffers are optional, yet we tell the GPU to execute them even if they contain no instructions. Doing so incurs the dispatch latency, which we can avoid if we don't ask the GPU to execute the no-op buffers. Allow ourselves to skip setup of empty buffer, and then to only enable non-empty buffers in the context image. Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20170921135444.27330-1-chris@chris-wilson.co.uk Reviewed-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/intel_lrc.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index f91e126a7f97..8d158deda328 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1278,7 +1278,8 @@ static int intel_init_workaround_bb(struct intel_engine_cs *engine) ret = -EINVAL; break; } - batch_ptr = wa_bb_fn[i](engine, batch_ptr); + if (wa_bb_fn[i]) + batch_ptr = wa_bb_fn[i](engine, batch_ptr); wa_bb[i]->size = batch_ptr - (batch + wa_bb[i]->offset); } @@ -1986,13 +1987,12 @@ static void execlists_init_reg_state(u32 *regs, CTX_REG(regs, CTX_SECOND_BB_HEAD_L, RING_SBBADDR(base), 0); CTX_REG(regs, CTX_SECOND_BB_STATE, RING_SBBSTATE(base), 0); if (rcs) { - CTX_REG(regs, CTX_BB_PER_CTX_PTR, RING_BB_PER_CTX_PTR(base), 0); + struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx; + CTX_REG(regs, CTX_RCS_INDIRECT_CTX, RING_INDIRECT_CTX(base), 0); CTX_REG(regs, CTX_RCS_INDIRECT_CTX_OFFSET, RING_INDIRECT_CTX_OFFSET(base), 0); - - if (engine->wa_ctx.vma) { - struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx; + if (wa_ctx->indirect_ctx.size) { u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma); regs[CTX_RCS_INDIRECT_CTX + 1] = @@ -2001,6 +2001,11 @@ static void execlists_init_reg_state(u32 *regs, regs[CTX_RCS_INDIRECT_CTX_OFFSET + 1] = intel_lr_indirect_ctx_offset(engine) << 6; + } + + CTX_REG(regs, CTX_BB_PER_CTX_PTR, RING_BB_PER_CTX_PTR(base), 0); + if (wa_ctx->per_ctx.size) { + u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma); regs[CTX_BB_PER_CTX_PTR + 1] = (ggtt_offset + wa_ctx->per_ctx.offset) | 0x01;