On 24/10/2025 12:04, Jocelyn Falempe wrote:
On a lenovo se100 server, when using i915 GPU for rendering, and the
ast driver for display, the graphic output is corrupted, and almost
unusable.
Adding a clflush call in the vmap function fixes this issue
completely.
AST is importing i915 allocated buffer in this use case, or how exactly
is the relationship?
Wondering if some path is not calling dma_buf_begin/end_cpu_access().
Regards,
Tvrtko
Signed-off-by: Jocelyn Falempe <[email protected]>
---
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index f4f1c979d1b9..f6a8c1cbe4d1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -77,6 +77,7 @@ static int i915_gem_dmabuf_vmap(struct dma_buf *dma_buf,
return PTR_ERR(vaddr);
iosys_map_set_vaddr(map, vaddr);
+ drm_clflush_virt_range(vaddr, dma_buf->size);
return 0;
}
base-commit: 0790925dadad0997580df6e32cdccd54316807f2
