From ea36ec8623f56791c6ff6738d0509b7920f85220 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 2 Feb 2020 17:16:31 +0000
Subject: drm: Remove PageReserved manipulation from drm_pci_alloc
Git-commit: ea36ec8623f56791c6ff6738d0509b7920f85220
Patch-mainline: v5.7-rc1
References: bsc#1114279
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
Bug: 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+
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200202171635.4039044-1-chris@chris-wilson.co.uk
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/drm_pci.c | 24 +++---------------------
1 file changed, 3 insertions(+), 21 deletions(-)
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -46,8 +46,6 @@
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.
@@ -61,7 +59,8 @@ drm_dma_handle_t *drm_pci_alloc(struct d
return NULL;
dmah->size = size;
- dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
+ dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr,
+ GFP_KERNEL);
if (dmah->vaddr == NULL) {
kfree(dmah);
@@ -70,13 +69,6 @@ drm_dma_handle_t *drm_pci_alloc(struct d
memset(dmah->vaddr, 0, size);
- /* 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;
}
@@ -89,19 +81,9 @@ 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);
- }
}
/**