drm/msm/a6xx: Add support for per-instance pagetables

Add support for using per-instance pagetables if all the dependencies are
available.
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Akhil P Oommen <akhilpo@codeaurora.org>

drivers/gpu/drm/msm/adreno/a6xx_gpu.c

@@ -81,6 +81,49 @@ static void get_stats_counter(struct msm_ringbuffer *ring, u32 counter,
 	OUT_RING(ring, upper_32_bits(iova));
 }
 
+static void a6xx_set_pagetable(struct a6xx_gpu *a6xx_gpu,
+		struct msm_ringbuffer *ring, struct msm_file_private *ctx)
+{
+	phys_addr_t ttbr;
+	u32 asid;
+	u64 memptr = rbmemptr(ring, ttbr0);
+
+	if (ctx == a6xx_gpu->cur_ctx)
+		return;
+
+	if (msm_iommu_pagetable_params(ctx->aspace->mmu, &ttbr, &asid))
+		return;
+
+	/* Execute the table update */
+	OUT_PKT7(ring, CP_SMMU_TABLE_UPDATE, 4);
+	OUT_RING(ring, CP_SMMU_TABLE_UPDATE_0_TTBR0_LO(lower_32_bits(ttbr)));
+
+	OUT_RING(ring,
+		CP_SMMU_TABLE_UPDATE_1_TTBR0_HI(upper_32_bits(ttbr)) |
+		CP_SMMU_TABLE_UPDATE_1_ASID(asid));
+	OUT_RING(ring, CP_SMMU_TABLE_UPDATE_2_CONTEXTIDR(0));
+	OUT_RING(ring, CP_SMMU_TABLE_UPDATE_3_CONTEXTBANK(0));
+
+	/*
+	 * Write the new TTBR0 to the memstore. This is good for debugging.
+	 */
+	OUT_PKT7(ring, CP_MEM_WRITE, 4);
+	OUT_RING(ring, CP_MEM_WRITE_0_ADDR_LO(lower_32_bits(memptr)));
+	OUT_RING(ring, CP_MEM_WRITE_1_ADDR_HI(upper_32_bits(memptr)));
+	OUT_RING(ring, lower_32_bits(ttbr));
+	OUT_RING(ring, (asid << 16) | upper_32_bits(ttbr));
+
+	/*
+	 * And finally, trigger a uche flush to be sure there isn't anything
+	 * lingering in that part of the GPU
+	 */
+
+	OUT_PKT7(ring, CP_EVENT_WRITE, 1);
+	OUT_RING(ring, 0x31);
+
+	a6xx_gpu->cur_ctx = ctx;
+}
+
 static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 {
 	unsigned int index = submit->seqno % MSM_GPU_SUBMIT_STATS_COUNT;
@@ -90,6 +133,8 @@ static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 	struct msm_ringbuffer *ring = submit->ring;
 	unsigned int i;
 
+	a6xx_set_pagetable(a6xx_gpu, ring, submit->queue->ctx);
+
 	get_stats_counter(ring, REG_A6XX_RBBM_PERFCTR_CP_0_LO,
 		rbmemptr_stats(ring, index, cpcycles_start));
 
@@ -704,6 +749,8 @@ static int a6xx_hw_init(struct msm_gpu *gpu)
 	/* Always come up on rb 0 */
 	a6xx_gpu->cur_ring = gpu->rb[0];
 
+	a6xx_gpu->cur_ctx = NULL;
+
 	/* Enable the SQE_to start the CP engine */
 	gpu_write(gpu, REG_A6XX_CP_SQE_CNTL, 1);
 
@@ -1020,6 +1067,20 @@ static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
 	return (unsigned long)busy_time;
 }
 
+static struct msm_gem_address_space *
+a6xx_create_private_address_space(struct msm_gpu *gpu)
+{
+	struct msm_mmu *mmu;
+
+	mmu = msm_iommu_pagetable_create(gpu->aspace->mmu);
+
+	if (IS_ERR(mmu))
+		return ERR_CAST(mmu);
+
+	return msm_gem_address_space_create(mmu,
+		"gpu", 0x100000000ULL, 0x1ffffffffULL);
+}
+
 static const struct adreno_gpu_funcs funcs = {
 	.base = {
 		.get_param = adreno_get_param,
@@ -1043,6 +1104,7 @@ static const struct adreno_gpu_funcs funcs = {
 		.gpu_state_put = a6xx_gpu_state_put,
 #endif
 		.create_address_space = adreno_iommu_create_address_space,
+		.create_private_address_space = a6xx_create_private_address_space,
 	},
 	.get_timestamp = a6xx_get_timestamp,
 };

drivers/gpu/drm/msm/adreno/a6xx_gpu.h

@@ -19,6 +19,7 @@ struct a6xx_gpu {
 	uint64_t sqe_iova;
 
 	struct msm_ringbuffer *cur_ring;
+	struct msm_file_private *cur_ctx;
 
 	struct a6xx_gmu gmu;
 };

drivers/gpu/drm/msm/msm_ringbuffer.h

@@ -31,6 +31,7 @@ struct msm_rbmemptrs {
 	volatile uint32_t fence;
 
 	volatile struct msm_gpu_submit_stats stats[MSM_GPU_SUBMIT_STATS_COUNT];
+	volatile u64 ttbr0;
 };
 
 struct msm_ringbuffer {