On Sun, Feb 02, 2020 at 04:10:09PM +0000, Chris Wilson wrote:

drm_pci_alloc/drm_pci_free are very thin wrappers around the core dma facilities, and we have no special reason within the drm layer to behave differently. In particular, since

commit de09d31dd38a50fdce106c15abd68432eebbd014 Author: Kirill A. Shutemov kirill.shutemov@linux.intel.com Date: Fri Jan 15 16:51:42 2016 -0800

page-flags: define PG_reserved behavior on compound pages

As far as I can see there's no users of PG_reserved on compound pages.
Let's use PF_NO_COMPOUND here.

it has been illegal to combine GFP_COMP with SetPageReserved, so lets stop doing both and leave the dma layer to its own devices.

Reported-by: Taketo Kabe Closes: https://gitlab.freedesktop.org/drm/intel/issues/1027 Fixes: de09d31dd38a ("page-flags: define PG_reserved behavior on compound pages") Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: stable@vger.kernel.org # v4.5+

Given that after your i915 patch only mga and r128 still use this I think deleting code is the best action here.

Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch

---

drivers/gpu/drm/drm_pci.c | 23 ++--------------------- 1 file changed, 2 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c index f2e43d341980..d16dac4325f9 100644 --- a/drivers/gpu/drm/drm_pci.c +++ b/drivers/gpu/drm/drm_pci.c @@ -51,8 +51,6 @@ drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) { drm_dma_handle_t *dmah;

• unsigned long addr;

• size_t sz;

  /* pci_alloc_consistent only guarantees alignment to the smallest

  • PAGE_SIZE order which is greater than or equal to the requested size.

@@ -68,20 +66,13 @@ drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t ali dmah->size = size; dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr,

• 			 GFP_KERNEL | __GFP_COMP);
  

• 			 GFP_KERNEL);
  
  

  if (dmah->vaddr == NULL) { kfree(dmah); 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;

}

@@ -94,19 +85,9 @@ EXPORT_SYMBOL(drm_pci_alloc); */ 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);

• }

}

/**

2.25.0

---

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