linux-kernel - [PATCH AUTOSEL 5.8 14/27] drm/ttm: fix offset in VMAs with a pg_offs in ttm_bo_vm

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Message-Id: <20200820000116.214821-14-sashal@kernel.org>
Date:   Wed, 19 Aug 2020 20:01:03 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Felix Kuehling <Felix.Kuehling@....com>,
        Laurent Morichetti <laurent.morichetti@....com>,
        Christian König <christian.koenig@....com>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.8 14/27] drm/ttm: fix offset in VMAs with a pg_offs in ttm_bo_vm_access

From: Felix Kuehling <Felix.Kuehling@....com>

[ Upstream commit c0001213d195d1bac83e0744c06ff06dd5a8ba53 ]

VMAs with a pg_offs that's offset from the start of the vma_node need
to adjust the offset within the BO accordingly. This matches the
offset calculation in ttm_bo_vm_fault_reserved.

Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
Tested-by: Laurent Morichetti <laurent.morichetti@....com>
Signed-off-by: Christian König <christian.koenig@....com>
Link: https://patchwork.freedesktop.org/patch/381169/
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/ttm/ttm_bo_vm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index fa03fab02076d..33526c5df0e8c 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -505,8 +505,10 @@ static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
 int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
 		     void *buf, int len, int write)
 {
-	unsigned long offset = (addr) - vma->vm_start;
 	struct ttm_buffer_object *bo = vma->vm_private_data;
+	unsigned long offset = (addr) - vma->vm_start +
+		((vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node))
+		 << PAGE_SHIFT);
 	int ret;
 
 	if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)
-- 
2.25.1