linux-kernel - [PATCH 3/5] drm/msm: use the right pgprot when mapping BOs in the kernel

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Date:   Fri, 23 Apr 2021 15:08:19 -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>,
        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 3/5] drm/msm: use the right pgprot when mapping BOs in the kernel

Use the same logic as the userspace mapping.

This fixes msm_rd with cached BOs.

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 drivers/gpu/drm/msm/msm_gem.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 09abda42d764..0f58937be0a9 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -199,6 +199,15 @@ void msm_gem_put_pages(struct drm_gem_object *obj)
 	/* when we start tracking the pin count, then do something here */
 }
 
+static pgprot_t msm_gem_pgprot(struct msm_gem_object *msm_obj, pgprot_t prot)
+{
+	if (msm_obj->flags & MSM_BO_WC)
+		return pgprot_writecombine(prot);
+	if (msm_obj->flags & MSM_BO_UNCACHED)
+		return pgprot_noncached(prot);
+	return prot;
+}
+
 int msm_gem_mmap_obj(struct drm_gem_object *obj,
 		struct vm_area_struct *vma)
 {
@@ -206,13 +215,7 @@ int msm_gem_mmap_obj(struct drm_gem_object *obj,
 
 	vma->vm_flags &= ~VM_PFNMAP;
 	vma->vm_flags |= VM_MIXEDMAP;
-
-	if (msm_obj->flags & MSM_BO_WC)
-		vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
-	else if (msm_obj->flags & MSM_BO_UNCACHED)
-		vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
-	else
-		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = msm_gem_pgprot(msm_obj, vm_get_page_prot(vma->vm_flags));
 
 	return 0;
 }
@@ -632,7 +635,7 @@ static void *get_vaddr(struct drm_gem_object *obj, unsigned madv)
 			goto fail;
 		}
 		msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
-				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
+				VM_MAP, msm_gem_pgprot(msm_obj, PAGE_KERNEL));
 		if (msm_obj->vaddr == NULL) {
 			ret = -ENOMEM;
 			goto fail;
-- 
2.26.1