linux-kernel - [PATCH v2 6/6] drm/msm/a6xx: Add support for per-instance pagetables

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Message-Id: <20200626200414.14382-7-jcrouse@codeaurora.org>
Date:   Fri, 26 Jun 2020 14:04:14 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        iommu@...ts.linux-foundation.org,
        John Stultz <john.stultz@...aro.org>,
        freedreno@...ts.freedesktop.org,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Emil Velikov <emil.velikov@...labora.com>,
        Eric Anholt <eric@...olt.net>,
        Jonathan Marek <jonathan@...ek.ca>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Sharat Masetty <smasetty@...eaurora.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 6/6] 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@...eaurora.org>
---

 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 43 +++++++++++++++++++++++++++
 drivers/gpu/drm/msm/msm_ringbuffer.h  |  1 +
 2 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index aa53f47b7e8b..95ed2ceac121 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -79,6 +79,34 @@ static void get_stats_counter(struct msm_ringbuffer *ring, u32 counter,
 	OUT_RING(ring, upper_32_bits(iova));
 }
 
+static void a6xx_set_pagetable(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
+		struct msm_file_private *ctx)
+{
+	phys_addr_t ttbr;
+	u32 asid;
+
+	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, lower_32_bits(ttbr));
+	OUT_RING(ring, (((u64) asid) << 48) | upper_32_bits(ttbr));
+	/* CONTEXTIDR is currently unused */
+	OUT_RING(ring, 0);
+	/* CONTEXTBANK is currently unused */
+	OUT_RING(ring, 0);
+
+	/*
+	 * Write the new TTBR0 to the memstore. This is good for debugging.
+	 */
+	OUT_PKT7(ring, CP_MEM_WRITE, 4);
+	OUT_RING(ring, lower_32_bits(rbmemptr(ring, ttbr0)));
+	OUT_RING(ring, upper_32_bits(rbmemptr(ring, ttbr0)));
+	OUT_RING(ring, lower_32_bits(ttbr));
+	OUT_RING(ring, (((u64) asid) << 48) | upper_32_bits(ttbr));
+}
+
 static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 	struct msm_file_private *ctx)
 {
@@ -89,6 +117,8 @@ 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(gpu, ring, ctx);
+
 	get_stats_counter(ring, REG_A6XX_RBBM_PERFCTR_CP_0_LO,
 		rbmemptr_stats(ring, index, cpcycles_start));
 
@@ -872,6 +902,18 @@ static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
 	return (unsigned long)busy_time;
 }
 
+struct msm_gem_address_space *a6xx_address_space_instance(struct msm_gpu *gpu)
+{
+	struct msm_mmu *mmu;
+
+	mmu = msm_iommu_pagetable_create(gpu->aspace->mmu);
+	if (IS_ERR(mmu))
+		return msm_gem_address_space_get(gpu->aspace);
+
+	return msm_gem_address_space_create(mmu,
+		"gpu", 0x100000000ULL, 0x1ffffffffULL);
+}
+
 static const struct adreno_gpu_funcs funcs = {
 	.base = {
 		.get_param = adreno_get_param,
@@ -895,6 +937,7 @@ static const struct adreno_gpu_funcs funcs = {
 		.gpu_state_put = a6xx_gpu_state_put,
 #endif
 		.create_address_space = adreno_iommu_create_address_space,
+		.address_space_instance = a6xx_address_space_instance,
 	},
 	.get_timestamp = a6xx_get_timestamp,
 };
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h
index 7764373d0ed2..0987d6bf848c 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.h
+++ b/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 {
-- 
2.17.1