2015-05-15 15:09 GMT+08:00 Alexandre Courbot acourbot@nvidia.com:
dma_alloc_coherent() can return memory in the vmalloc range. virt_to_page() cannot handle such addresses and crashes. This patch detects such cases and obtains the struct page * using vmalloc_to_page() instead.
Signed-off-by: Alexandre Courbot acourbot@nvidia.com
This patch is a follow-up of the following discussion:
https://www.marc.info/?l=dri-devel&m=141579595431254&w=3
It works for me on both 32-bit and 64-bit Tegra, so I am not convinced that Thierry's initial change from virt_to_page() to phys_to_page() is still required - Thierry, can you confirm whether your patch is still relevant after this one?
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c index 01e1d27eb078..3077f1554099 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c @@ -342,9 +342,12 @@ static struct dma_page *__ttm_dma_alloc_page(struct dma_pool *pool) d_page->vaddr = dma_alloc_coherent(pool->dev, pool->size, &d_page->dma, pool->gfp_flags);
if (d_page->vaddr)d_page->p = virt_to_page(d_page->vaddr);else {
if (d_page->vaddr) {if (is_vmalloc_addr(d_page->vaddr))d_page->p = vmalloc_to_page(d_page->vaddr);elsed_page->p = virt_to_page(d_page->vaddr);} else { kfree(d_page); d_page = NULL; }-- 2.4.0
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for safe , i think we can add this patch:
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index f800d45..3463f4f 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -77,7 +77,8 @@ * private definitions which should NOT be used outside memory.h * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. */ -#define __virt_to_phys(x) (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET)) +#define __virt_to_phys(x) ({BUG_ON(x < PAGE_OFFSET);\ + (phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET;}) #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
/*
BRs Yalin