linux-kernel - [PATCH 3/9] drm/msm/a6xx: allow allocating GMU memory with a fixed address

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Date:   Mon, 20 Apr 2020 10:03:07 -0400
From:   Jonathan Marek <jonathan@...ek.ca>
To:     freedreno@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        "Michael J. Ruhl" <michael.j.ruhl@...el.com>,
        Sharat Masetty <smasetty@...eaurora.org>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 3/9] drm/msm/a6xx: allow allocating GMU memory with a fixed address

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 748cd379065f..c6ecb3189ec5 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -938,8 +938,8 @@ static void a6xx_gmu_memory_free(struct a6xx_gmu *gmu, struct a6xx_gmu_bo *bo)
 	kfree(bo);
 }
 
-static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu,
-		size_t size)
+static struct a6xx_gmu_bo *
+a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu, size_t size, uint64_t iova)
 {
 	struct a6xx_gmu_bo *bo;
 	int ret, count, i;
@@ -964,13 +964,13 @@ static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu,
 			goto err;
 	}
 
-	bo->iova = gmu->uncached_iova_base;
+	bo->iova = iova ?: gmu->uncached_iova_base;
 
 	for (i = 0; i < count; i++) {
 		ret = iommu_map(gmu->domain,
 			bo->iova + (PAGE_SIZE * i),
 			page_to_phys(bo->pages[i]), PAGE_SIZE,
-			IOMMU_READ | IOMMU_WRITE);
+			IOMMU_READ | IOMMU_WRITE | IOMMU_PRIV);
 
 		if (ret) {
 			DRM_DEV_ERROR(gmu->dev, "Unable to map GMU buffer object\n");
@@ -990,7 +990,8 @@ static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu,
 		goto err;
 
 	/* Align future IOVA addresses on 1MB boundaries */
-	gmu->uncached_iova_base += ALIGN(size, SZ_1M);
+	if (!iova)
+		gmu->uncached_iova_base += ALIGN(size, SZ_1M);
 
 	return bo;
 
@@ -1331,12 +1332,12 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 		goto err_put_device;
 
 	/* Allocate memory for for the HFI queues */
-	gmu->hfi = a6xx_gmu_memory_alloc(gmu, SZ_16K);
+	gmu->hfi = a6xx_gmu_memory_alloc(gmu, SZ_16K, 0);
 	if (IS_ERR(gmu->hfi))
 		goto err_memory;
 
 	/* Allocate memory for the GMU debug region */
-	gmu->debug = a6xx_gmu_memory_alloc(gmu, SZ_16K);
+	gmu->debug = a6xx_gmu_memory_alloc(gmu, SZ_16K, 0);
 	if (IS_ERR(gmu->debug))
 		goto err_memory;
 
-- 
2.26.1