[Intel-gfx] [PATCH v4 24/24] drm/i915/bdw: Support dynamic pdp updates in lrc mode

[Michel Thierry]

Logic ring contexts need to know the PDPs when they are populated. With
dynamic page table allocations, these PDPs may not exist yet.

Check if PDPs have been allocated and use the scratch page if they do
not exist yet.

Before submission, update the PDPs in the logic ring context as PDPs
have been allocated.

v2: Renamed commit title (Daniel)

Cc: Daniel Vetter <daniel at ffwll.ch>
Signed-off-by: Michel Thierry <michel.thierry at intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 80 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 70 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index efaaebe..109ec59 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -358,6 +358,7 @@ static void execlists_elsp_write(struct intel_engine_cs *ring,
 
 static int execlists_update_context(struct drm_i915_gem_object *ctx_obj,
 				    struct drm_i915_gem_object *ring_obj,
+				    struct i915_hw_ppgtt *ppgtt,
 				    u32 tail)
 {
 	struct page *page;
@@ -369,6 +370,40 @@ static int execlists_update_context(struct drm_i915_gem_object *ctx_obj,
 	reg_state[CTX_RING_TAIL+1] = tail;
 	reg_state[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(ring_obj);
 
+	/* True PPGTT with dynamic page allocation: update PDP registers and
+	 * point the unallocated PDPs to the scratch page
+	 */
+	if (ppgtt) {
+		if (test_bit(3, ppgtt->pdp.used_pdpes)) {
+			reg_state[CTX_PDP3_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[3]->daddr);
+			reg_state[CTX_PDP3_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[3]->daddr);
+		} else {
+			reg_state[CTX_PDP3_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+			reg_state[CTX_PDP3_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+		}
+		if (test_bit(2, ppgtt->pdp.used_pdpes)) {
+			reg_state[CTX_PDP2_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[2]->daddr);
+			reg_state[CTX_PDP2_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[2]->daddr);
+		} else {
+			reg_state[CTX_PDP2_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+			reg_state[CTX_PDP2_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+		}
+		if (test_bit(1, ppgtt->pdp.used_pdpes)) {
+			reg_state[CTX_PDP1_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[1]->daddr);
+			reg_state[CTX_PDP1_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[1]->daddr);
+		} else {
+			reg_state[CTX_PDP1_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+			reg_state[CTX_PDP1_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+		}
+		if (test_bit(0, ppgtt->pdp.used_pdpes)) {
+			reg_state[CTX_PDP0_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[0]->daddr);
+			reg_state[CTX_PDP0_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[0]->daddr);
+		} else {
+			reg_state[CTX_PDP0_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+			reg_state[CTX_PDP0_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+		}
+	}
+
 	kunmap_atomic(reg_state);
 
 	return 0;
@@ -387,7 +422,7 @@ static void execlists_submit_contexts(struct intel_engine_cs *ring,
 	WARN_ON(!i915_gem_obj_is_pinned(ctx_obj0));
 	WARN_ON(!i915_gem_obj_is_pinned(ringbuf0->obj));
 
-	execlists_update_context(ctx_obj0, ringbuf0->obj, tail0);
+	execlists_update_context(ctx_obj0, ringbuf0->obj, to0->ppgtt, tail0);
 
 	if (to1) {
 		ringbuf1 = to1->engine[ring->id].ringbuf;
@@ -396,7 +431,7 @@ static void execlists_submit_contexts(struct intel_engine_cs *ring,
 		WARN_ON(!i915_gem_obj_is_pinned(ctx_obj1));
 		WARN_ON(!i915_gem_obj_is_pinned(ringbuf1->obj));
 
-		execlists_update_context(ctx_obj1, ringbuf1->obj, tail1);
+		execlists_update_context(ctx_obj1, ringbuf1->obj, to1->ppgtt, tail1);
 	}
 
 	execlists_elsp_write(ring, ctx_obj0, ctx_obj1);
@@ -1731,14 +1766,39 @@ populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_o
 	reg_state[CTX_PDP1_LDW] = GEN8_RING_PDP_LDW(ring, 1);
 	reg_state[CTX_PDP0_UDW] = GEN8_RING_PDP_UDW(ring, 0);
 	reg_state[CTX_PDP0_LDW] = GEN8_RING_PDP_LDW(ring, 0);
-	reg_state[CTX_PDP3_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[3]->daddr);
-	reg_state[CTX_PDP3_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[3]->daddr);
-	reg_state[CTX_PDP2_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[2]->daddr);
-	reg_state[CTX_PDP2_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[2]->daddr);
-	reg_state[CTX_PDP1_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[1]->daddr);
-	reg_state[CTX_PDP1_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[1]->daddr);
-	reg_state[CTX_PDP0_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[0]->daddr);
-	reg_state[CTX_PDP0_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[0]->daddr);
+
+	/* With dynamic page allocation, PDPs may not be allocated at this point,
+	 * Point the unallocated PDPs to the scratch page
+	 */
+	if (test_bit(3, ppgtt->pdp.used_pdpes)) {
+		reg_state[CTX_PDP3_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[3]->daddr);
+		reg_state[CTX_PDP3_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[3]->daddr);
+	} else {
+		reg_state[CTX_PDP3_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+		reg_state[CTX_PDP3_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+	}
+	if (test_bit(2, ppgtt->pdp.used_pdpes)) {
+		reg_state[CTX_PDP2_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[2]->daddr);
+		reg_state[CTX_PDP2_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[2]->daddr);
+	} else {
+		reg_state[CTX_PDP2_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+		reg_state[CTX_PDP2_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+	}
+	if (test_bit(1, ppgtt->pdp.used_pdpes)) {
+		reg_state[CTX_PDP1_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[1]->daddr);
+		reg_state[CTX_PDP1_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[1]->daddr);
+	} else {
+		reg_state[CTX_PDP1_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+		reg_state[CTX_PDP1_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+	}
+	if (test_bit(0, ppgtt->pdp.used_pdpes)) {
+		reg_state[CTX_PDP0_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[0]->daddr);
+		reg_state[CTX_PDP0_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[0]->daddr);
+	} else {
+		reg_state[CTX_PDP0_UDW+1] = upper_32_bits(ppgtt->scratch_pd->daddr);
+		reg_state[CTX_PDP0_LDW+1] = lower_32_bits(ppgtt->scratch_pd->daddr);
+	}
+
 	if (ring->id == RCS) {
 		reg_state[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
 		reg_state[CTX_R_PWR_CLK_STATE] = 0x20c8;
-- 
2.1.1