35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
From 368a606185e6bb276747c90d0127e471f9457771 Mon Sep 17 00:00:00 2001
|
|
From: Sasha Finkelstein <fnkl.kernel@gmail.com>
|
|
Date: Fri, 17 Jan 2025 12:34:23 +0100
|
|
Subject: [PATCH 20/21] virtgpu: gem partial map
|
|
|
|
Those are useful to implement coherent cross-vm mmap.
|
|
|
|
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
|
|
---
|
|
drivers/gpu/drm/virtio/virtgpu_vram.c | 5 ++---
|
|
1 file changed, 2 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/drivers/gpu/drm/virtio/virtgpu_vram.c b/drivers/gpu/drm/virtio/virtgpu_vram.c
|
|
index 25df81c02783..64e2c6dbdd67 100644
|
|
--- a/drivers/gpu/drm/virtio/virtgpu_vram.c
|
|
+++ b/drivers/gpu/drm/virtio/virtgpu_vram.c
|
|
@@ -56,12 +56,11 @@ static int virtio_gpu_vram_mmap(struct drm_gem_object *obj,
|
|
else if (vram->map_info == VIRTIO_GPU_MAP_CACHE_UNCACHED)
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
|
|
- /* Partial mappings of GEM buffers don't happen much in practice. */
|
|
- if (vm_size != vram->vram_node.size)
|
|
+ if (vm_size > vram->vram_node.size)
|
|
return -EINVAL;
|
|
|
|
ret = io_remap_pfn_range(vma, vma->vm_start,
|
|
- vram->vram_node.start >> PAGE_SHIFT,
|
|
+ (vram->vram_node.start >> PAGE_SHIFT) + vma->vm_pgoff,
|
|
vm_size, vma->vm_page_prot);
|
|
return ret;
|
|
}
|
|
--
|
|
2.47.1
|
|
|