[PATCH 1/5] nouveau: fix storing invalid ptes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



When migrating a range of system memory to device private memory, some
of the pages in the address range may not be migrating. In this case,
the non migrating pages won't have a new GPU MMU entry to store but
the nvif_object_ioctl() NVIF_VMM_V0_PFNMAP method doesn't check the input
and stores a bad valid GPU page table entry.
Fix this by skipping the invalid input PTEs when updating the GPU page
tables.

Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c
index ed37fddd063f..7eabe9fe0d2b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c
@@ -79,8 +79,12 @@ gp100_vmm_pgt_pfn(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
 	dma_addr_t addr;
 
 	nvkm_kmap(pt->memory);
-	while (ptes--) {
+	for (; ptes; ptes--, map->pfn++) {
 		u64 data = 0;
+
+		if (!(*map->pfn & NVKM_VMM_PFN_V))
+			continue;
+
 		if (!(*map->pfn & NVKM_VMM_PFN_W))
 			data |= BIT_ULL(6); /* RO. */
 
@@ -100,7 +104,6 @@ gp100_vmm_pgt_pfn(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
 		}
 
 		VMM_WO064(pt, vmm, ptei++ * 8, data);
-		map->pfn++;
 	}
 	nvkm_done(pt->memory);
 }
@@ -310,9 +313,12 @@ gp100_vmm_pd0_pfn(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
 	dma_addr_t addr;
 
 	nvkm_kmap(pt->memory);
-	while (ptes--) {
+	for (; ptes; ptes--, map->pfn++) {
 		u64 data = 0;
 
+		if (!(*map->pfn & NVKM_VMM_PFN_V))
+			continue;
+
 		if (!(*map->pfn & NVKM_VMM_PFN_W))
 			data |= BIT_ULL(6); /* RO. */
 
@@ -332,7 +338,6 @@ gp100_vmm_pd0_pfn(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
 		}
 
 		VMM_WO064(pt, vmm, ptei++ * 16, data);
-		map->pfn++;
 	}
 	nvkm_done(pt->memory);
 }
-- 
2.20.1





[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux