linux-kernel - [PATCH v2 20/34] drm/msm: Split out helper to get iommu prot flags

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Message-ID: <20250319145425.51935-21-robdclark@gmail.com>
Date: Wed, 19 Mar 2025 07:52:32 -0700
From: Rob Clark <robdclark@...il.com>
To: dri-devel@...ts.freedesktop.org
Cc: freedreno@...ts.freedesktop.org,
	linux-arm-msm@...r.kernel.org,
	Rob Clark <robdclark@...omium.org>,
	Rob Clark <robdclark@...il.com>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Dmitry Baryshkov <lumag@...nel.org>,
	Sean Paul <sean@...rly.run>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 20/34] drm/msm: Split out helper to get iommu prot flags

From: Rob Clark <robdclark@...omium.org>

We'll re-use this in the vm_bind path.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c | 12 ++++++++++--
 drivers/gpu/drm/msm/msm_gem.h |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 9d4f7b76471f..632f560c81ec 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -450,10 +450,9 @@ static struct drm_gpuva *get_vma_locked(struct drm_gem_object *obj,
 	return vma;
 }
 
-int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma)
+int msm_gem_prot(struct drm_gem_object *obj)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	struct page **pages;
 	int prot = IOMMU_READ;
 
 	if (!(msm_obj->flags & MSM_BO_GPU_READONLY))
@@ -469,6 +468,15 @@ int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma)
 	else if (prot == 2)
 		prot |= IOMMU_USE_LLC_NWA;
 
+	return prot;
+}
+
+int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct page **pages;
+	int prot = msm_gem_prot(obj);
+
 	msm_gem_assert_locked(obj);
 
 	pages = msm_gem_get_pages_locked(obj, MSM_MADV_WILLNEED);
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index d427ead2dce0..7ccdf15476b9 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -188,6 +188,7 @@ struct msm_gem_object {
 #define to_msm_bo(x) container_of(x, struct msm_gem_object, base)
 
 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj);
+int msm_gem_prot(struct drm_gem_object *obj);
 int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma);
 void msm_gem_unpin_locked(struct drm_gem_object *obj);
 void msm_gem_unpin_active(struct drm_gem_object *obj);
-- 
2.48.1