linux-kernel - [PATCH] drm/msm: fix msm_gem_vma_new() allocations for managed GPUVMs

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Message-Id: <20250823-msm-fix-gpuvm-init-v1-1-e199cd5b1983@oss.qualcomm.com>
Date: Sat, 23 Aug 2025 03:12:00 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Matthew Brost <matthew.brost@...el.com>,
        Himal Prasad Ghimiray <himal.prasad.ghimiray@...el.com>,
        Danilo Krummrich <dakr@...nel.org>,
        Boris Brezillon <boris.brezillon@...labora.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Danct12 <danct12@...root.org>
Subject: [PATCH] drm/msm: fix msm_gem_vma_new() allocations for managed
 GPUVMs

Since commit 3309323241fb ("drm/gpuvm: Kill drm_gpuva_init()") MSM
driver fails to init, failing with "[drm:msm_gpu_init] *ERROR* could not
allocate memptrs: -22" errors. The mentioned commit reworked the
function, but didn't take into account that op_map is initialized at the
top of the function, while ranges might change if GPUVM is managed by
the kernel.

Move op_mode initialization after finalizing all addresses and right
before the drm_gpuva_init_from_op() call.

Reported-by: Danct12 <danct12@...root.org>
Fixes: 3309323241fb ("drm/gpuvm: Kill drm_gpuva_init()")
Suggested-by: Rob Clark <robin.clark@....qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/msm/msm_gem_vma.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index 3f440bc1f7106f3b0091f037611d0b433e5e2c18..6df6b7c0984da57fe64de41fa54f7dea0a324c74 100644
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -368,12 +368,6 @@ struct drm_gpuva *
 msm_gem_vma_new(struct drm_gpuvm *gpuvm, struct drm_gem_object *obj,
 		u64 offset, u64 range_start, u64 range_end)
 {
-	struct drm_gpuva_op_map op_map = {
-		.va.addr = range_start,
-		.va.range = range_end - range_start,
-		.gem.obj = obj,
-		.gem.offset = offset,
-	};
 	struct msm_gem_vm *vm = to_msm_vm(gpuvm);
 	struct drm_gpuvm_bo *vm_bo;
 	struct msm_gem_vma *vma;
@@ -402,6 +396,13 @@ msm_gem_vma_new(struct drm_gpuvm *gpuvm, struct drm_gem_object *obj,
 	if (obj)
 		GEM_WARN_ON((range_end - range_start) > obj->size);
 
+	struct drm_gpuva_op_map op_map = {
+		.va.addr = range_start,
+		.va.range = range_end - range_start,
+		.gem.obj = obj,
+		.gem.offset = offset,
+	};
+
 	drm_gpuva_init_from_op(&vma->base, &op_map);
 	vma->mapped = false;
 

---
base-commit: 0f4c93f7eb861acab537dbe94441817a270537bf
change-id: 20250823-msm-fix-gpuvm-init-520d87ebcf26

Best regards,
-- 
With best wishes
Dmitry