6.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
commit 50f1199250912568606b3778dc56646c10cb7b04 upstream.
Make sure that for external buffers mapping goes through the dma_buf
interface instead of trying to access pages directly.
External buffers might not provide direct access to readable/writable
pages so to make sure the bo's created from external dma_bufs can be
read dma_buf interface has to be used.
Fixes crashes in IGT's kms_prime with vgem. Regular desktop usage won't
trigger this due to the fact that virtual machines will not have
multiple GPUs but it enables better test coverage in IGT.
Signed-off-by: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
Fixes: b32233acceff ("drm/vmwgfx: Fix prime import/export")
Cc: <stable@xxxxxxxxxxxxxxx> # v6.6+
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # v6.9+
Link: https://patchwork.freedesktop.org/patch/msgid/20240816183332.31961-3-zack.rusin@xxxxxxxxxxxx
Reviewed-by: Martin Krastev <martin.krastev@xxxxxxxxxxxx>
Reviewed-by: Maaz Mombasawala <maaz.mombasawala@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_blit.c | 114 +++++++++++++++++++++++++++++++++--
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 4 -
drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c | 12 +--
3 files changed, 118 insertions(+), 12 deletions(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c
@@ -27,6 +27,8 @@
**************************************************************************/
#include "vmwgfx_drv.h"
+
+#include "vmwgfx_bo.h"
#include <linux/highmem.h>
/*
@@ -420,13 +422,105 @@ static int vmw_bo_cpu_blit_line(struct v
return 0;
}
+static void *map_external(struct vmw_bo *bo, struct iosys_map *map)
+{
+ struct vmw_private *vmw =
+ container_of(bo->tbo.bdev, struct vmw_private, bdev);
+ void *ptr = NULL;
+ int ret;
+
+ if (bo->tbo.base.import_attach) {
+ ret = dma_buf_vmap(bo->tbo.base.dma_buf, map);
+ if (ret) {
+ drm_dbg_driver(&vmw->drm,
+ "Wasn't able to map external bo!\n");
+ goto out;
+ }
+ ptr = map->vaddr;
+ } else {
+ ptr = vmw_bo_map_and_cache(bo);
+ }
+
+out:
+ return ptr;
+}
+
+static void unmap_external(struct vmw_bo *bo, struct iosys_map *map)
+{
+ if (bo->tbo.base.import_attach)
+ dma_buf_vunmap(bo->tbo.base.dma_buf, map);
+ else
+ vmw_bo_unmap(bo);
+}
+
+static int vmw_external_bo_copy(struct vmw_bo *dst, u32 dst_offset,
+ u32 dst_stride, struct vmw_bo *src,
+ u32 src_offset, u32 src_stride,
+ u32 width_in_bytes, u32 height,
+ struct vmw_diff_cpy *diff)
+{
+ struct vmw_private *vmw =
+ container_of(dst->tbo.bdev, struct vmw_private, bdev);
+ size_t dst_size = dst->tbo.resource->size;
+ size_t src_size = src->tbo.resource->size;
+ struct iosys_map dst_map = {0};
+ struct iosys_map src_map = {0};
+ int ret, i;
+ int x_in_bytes;
+ u8 *vsrc;
+ u8 *vdst;
+
+ vsrc = map_external(src, &src_map);
+ if (!vsrc) {
+ drm_dbg_driver(&vmw->drm, "Wasn't able to map src\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ vdst = map_external(dst, &dst_map);
+ if (!vdst) {
+ drm_dbg_driver(&vmw->drm, "Wasn't able to map dst\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ vsrc += src_offset;
+ vdst += dst_offset;
+ if (src_stride == dst_stride) {
+ dst_size -= dst_offset;
+ src_size -= src_offset;
+ memcpy(vdst, vsrc,
+ min(dst_stride * height, min(dst_size, src_size)));
+ } else {
+ WARN_ON(dst_stride < width_in_bytes);
+ for (i = 0; i < height; ++i) {
+ memcpy(vdst, vsrc, width_in_bytes);
+ vsrc += src_stride;
+ vdst += dst_stride;
+ }
+ }
+
+ x_in_bytes = (dst_offset % dst_stride);
+ diff->rect.x1 = x_in_bytes / diff->cpp;
+ diff->rect.y1 = ((dst_offset - x_in_bytes) / dst_stride);
+ diff->rect.x2 = diff->rect.x1 + width_in_bytes / diff->cpp;
+ diff->rect.y2 = diff->rect.y1 + height;
+
+ ret = 0;
+out:
+ unmap_external(src, &src_map);
+ unmap_external(dst, &dst_map);
+
+ return ret;
+}
+
/**
* vmw_bo_cpu_blit - in-kernel cpu blit.
*
- * @dst: Destination buffer object.
+ * @vmw_dst: Destination buffer object.
* @dst_offset: Destination offset of blit start in bytes.
* @dst_stride: Destination stride in bytes.
- * @src: Source buffer object.
+ * @vmw_src: Source buffer object.
* @src_offset: Source offset of blit start in bytes.
* @src_stride: Source stride in bytes.
* @w: Width of blit.
@@ -444,13 +538,15 @@ static int vmw_bo_cpu_blit_line(struct v
* Neither of the buffer objects may be placed in PCI memory
* (Fixed memory in TTM terminology) when using this function.
*/
-int vmw_bo_cpu_blit(struct ttm_buffer_object *dst,
+int vmw_bo_cpu_blit(struct vmw_bo *vmw_dst,
u32 dst_offset, u32 dst_stride,
- struct ttm_buffer_object *src,
+ struct vmw_bo *vmw_src,
u32 src_offset, u32 src_stride,
u32 w, u32 h,
struct vmw_diff_cpy *diff)
{
+ struct ttm_buffer_object *src = &vmw_src->tbo;
+ struct ttm_buffer_object *dst = &vmw_dst->tbo;
struct ttm_operation_ctx ctx = {
.interruptible = false,
.no_wait_gpu = false
@@ -460,6 +556,11 @@ int vmw_bo_cpu_blit(struct ttm_buffer_ob
int ret = 0;
struct page **dst_pages = NULL;
struct page **src_pages = NULL;
+ bool src_external = (src->ttm->page_flags & TTM_TT_FLAG_EXTERNAL) != 0;
+ bool dst_external = (dst->ttm->page_flags & TTM_TT_FLAG_EXTERNAL) != 0;
+
+ if (WARN_ON(dst == src))
+ return -EINVAL;
/* Buffer objects need to be either pinned or reserved: */
if (!(dst->pin_count))
@@ -479,6 +580,11 @@ int vmw_bo_cpu_blit(struct ttm_buffer_ob
return ret;
}
+ if (src_external || dst_external)
+ return vmw_external_bo_copy(vmw_dst, dst_offset, dst_stride,
+ vmw_src, src_offset, src_stride,
+ w, h, diff);
+
if (!src->ttm->pages && src->ttm->sg) {
src_pages = kvmalloc_array(src->ttm->num_pages,
sizeof(struct page *), GFP_KERNEL);
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -1353,9 +1353,9 @@ void vmw_diff_memcpy(struct vmw_diff_cpy
void vmw_memcpy(struct vmw_diff_cpy *diff, u8 *dest, const u8 *src, size_t n);
-int vmw_bo_cpu_blit(struct ttm_buffer_object *dst,
+int vmw_bo_cpu_blit(struct vmw_bo *dst,
u32 dst_offset, u32 dst_stride,
- struct ttm_buffer_object *src,
+ struct vmw_bo *src,
u32 src_offset, u32 src_stride,
u32 w, u32 h,
struct vmw_diff_cpy *diff);
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
@@ -502,7 +502,7 @@ static void vmw_stdu_bo_cpu_commit(struc
container_of(dirty->unit, typeof(*stdu), base);
s32 width, height;
s32 src_pitch, dst_pitch;
- struct ttm_buffer_object *src_bo, *dst_bo;
+ struct vmw_bo *src_bo, *dst_bo;
u32 src_offset, dst_offset;
struct vmw_diff_cpy diff = VMW_CPU_BLIT_DIFF_INITIALIZER(stdu->cpp);
@@ -517,11 +517,11 @@ static void vmw_stdu_bo_cpu_commit(struc
/* Assume we are blitting from Guest (bo) to Host (display_srf) */
src_pitch = stdu->display_srf->metadata.base_size.width * stdu->cpp;
- src_bo = &stdu->display_srf->res.guest_memory_bo->tbo;
+ src_bo = stdu->display_srf->res.guest_memory_bo;
src_offset = ddirty->top * src_pitch + ddirty->left * stdu->cpp;
dst_pitch = ddirty->pitch;
- dst_bo = &ddirty->buf->tbo;
+ dst_bo = ddirty->buf;
dst_offset = ddirty->fb_top * dst_pitch + ddirty->fb_left * stdu->cpp;
(void) vmw_bo_cpu_blit(dst_bo, dst_offset, dst_pitch,
@@ -1170,7 +1170,7 @@ vmw_stdu_bo_populate_update_cpu(struct v
struct vmw_diff_cpy diff = VMW_CPU_BLIT_DIFF_INITIALIZER(0);
struct vmw_stdu_update_gb_image *cmd_img = cmd;
struct vmw_stdu_update *cmd_update;
- struct ttm_buffer_object *src_bo, *dst_bo;
+ struct vmw_bo *src_bo, *dst_bo;
u32 src_offset, dst_offset;
s32 src_pitch, dst_pitch;
s32 width, height;
@@ -1184,11 +1184,11 @@ vmw_stdu_bo_populate_update_cpu(struct v
diff.cpp = stdu->cpp;
- dst_bo = &stdu->display_srf->res.guest_memory_bo->tbo;
+ dst_bo = stdu->display_srf->res.guest_memory_bo;
dst_pitch = stdu->display_srf->metadata.base_size.width * stdu->cpp;
dst_offset = bb->y1 * dst_pitch + bb->x1 * stdu->cpp;
- src_bo = &vfbbo->buffer->tbo;
+ src_bo = vfbbo->buffer;
src_pitch = update->vfb->base.pitches[0];
src_offset = bo_update->fb_top * src_pitch + bo_update->fb_left *
stdu->cpp;
