[PATCH 05/16] drm: don't mark pages returned from drm_pci_alloc reserved
From: Christoph Hellwig <hch@lst.de>
Date: 2019-06-14 13:50:01
Also in:
dri-devel, intel-gfx, linux-arm-kernel, linux-iommu, linux-media, linux-rdma, linux-s390, linux-wireless, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
We are not allowed to call virt_to_page on pages returned from dma_alloc_coherent, as in many cases the virtual address returned is aactually a kernel direct mapping. Also there generally is no need to mark dma memory as reserved. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/gpu/drm/drm_bufs.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index 7418872d87c6..b640437ce90f 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c@@ -77,13 +77,6 @@ drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t ali return NULL; } - /* XXX - Is virt_to_page() legal for consistent mem? */ - /* Reserve */ - for (addr = (unsigned long)dmah->vaddr, sz = size; - sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { - SetPageReserved(virt_to_page((void *)addr)); - } - return dmah; }
@@ -97,16 +90,9 @@ void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) unsigned long addr; size_t sz; - if (dmah->vaddr) { - /* XXX - Is virt_to_page() legal for consistent mem? */ - /* Unreserve */ - for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; - sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { - ClearPageReserved(virt_to_page((void *)addr)); - } + if (dmah->vaddr) dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, dmah->busaddr); - } } /**
--
2.20.1