From eb7e5cfced102e61814f6f3e4cb4acb9f9315760 Mon Sep 17 00:00:00 2001 From: Andrey Grodzovsky Date: Wed, 22 Aug 2018 10:07:35 -0400 Subject: [PATCH] drm/amdgpu: Fix page fault and kasan warning on pci device remove. Problem: When executing echo 1 > /sys/class/drm/card0/device/remove kasan warning as bellow and page fault happen because adev->gart.pages already freed by the time amdgpu_gart_unbind is called. BUG: KASAN: user-memory-access in amdgpu_gart_unbind+0x98/0x180 [amdgpu] Write of size 8 at addr 0000000000003648 by task bash/1828 CPU: 2 PID: 1828 Comm: bash Tainted: G W O 4.18.0-rc1-dev+ #29 Hardware name: Gigabyte Technology Co., Ltd. AX370-Gaming/AX370-Gaming-CF, BIOS F3 06/19/2017 Call Trace: dump_stack+0x71/0xab kasan_report+0x109/0x390 amdgpu_gart_unbind+0x98/0x180 [amdgpu] ttm_tt_unbind+0x43/0x60 [ttm] ttm_bo_move_ttm+0x83/0x1c0 [ttm] ttm_bo_handle_move_mem+0xb97/0xd00 [ttm] ttm_bo_evict+0x273/0x530 [ttm] ttm_mem_evict_first+0x29c/0x360 [ttm] ttm_bo_force_list_clean+0xfc/0x210 [ttm] ttm_bo_clean_mm+0xe7/0x160 [ttm] amdgpu_ttm_fini+0xda/0x1d0 [amdgpu] amdgpu_bo_fini+0xf/0x60 [amdgpu] gmc_v8_0_sw_fini+0x36/0x70 [amdgpu] amdgpu_device_fini+0x2d0/0x7d0 [amdgpu] amdgpu_driver_unload_kms+0x6a/0xd0 [amdgpu] drm_dev_unregister+0x79/0x180 [drm] amdgpu_pci_remove+0x2a/0x60 [amdgpu] pci_device_remove+0x5b/0x100 device_release_driver_internal+0x236/0x360 pci_stop_bus_device+0xbf/0xf0 pci_stop_and_remove_bus_device_locked+0x16/0x30 remove_store+0xda/0xf0 kernfs_fop_write+0x186/0x220 __vfs_write+0xcc/0x330 vfs_write+0xe6/0x250 ksys_write+0xb1/0x140 do_syscall_64+0x77/0x1e0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f66ebbb32c0 Fix: Split gmc_v{6,7,8,9}_0_gart_fini to postpone amdgpu_gart_fini to after memory managers are shut down since gart unbind happens as part of this procedure Signed-off-by: Andrey Grodzovsky Reviewed-by: Junwei Zhang Acked-by: Huang Rui Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c | 9 ++------- drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 16 ++-------------- drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 16 ++-------------- drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 16 ++-------------- 4 files changed, 8 insertions(+), 49 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c index 75317f283c69..ad151fefa41f 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c @@ -632,12 +632,6 @@ static void gmc_v6_0_gart_disable(struct amdgpu_device *adev) amdgpu_gart_table_vram_unpin(adev); } -static void gmc_v6_0_gart_fini(struct amdgpu_device *adev) -{ - amdgpu_gart_table_vram_free(adev); - amdgpu_gart_fini(adev); -} - static void gmc_v6_0_vm_decode_fault(struct amdgpu_device *adev, u32 status, u32 addr, u32 mc_client) { @@ -935,8 +929,9 @@ static int gmc_v6_0_sw_fini(void *handle) amdgpu_gem_force_release(adev); amdgpu_vm_manager_fini(adev); - gmc_v6_0_gart_fini(adev); + amdgpu_gart_table_vram_free(adev); amdgpu_bo_fini(adev); + amdgpu_gart_fini(adev); release_firmware(adev->gmc.fw); adev->gmc.fw = NULL; diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c index 36dc367c4b45..f8d8a3a73e42 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c @@ -746,19 +746,6 @@ static void gmc_v7_0_gart_disable(struct amdgpu_device *adev) amdgpu_gart_table_vram_unpin(adev); } -/** - * gmc_v7_0_gart_fini - vm fini callback - * - * @adev: amdgpu_device pointer - * - * Tears down the driver GART/VM setup (CIK). - */ -static void gmc_v7_0_gart_fini(struct amdgpu_device *adev) -{ - amdgpu_gart_table_vram_free(adev); - amdgpu_gart_fini(adev); -} - /** * gmc_v7_0_vm_decode_fault - print human readable fault info * @@ -1095,8 +1082,9 @@ static int gmc_v7_0_sw_fini(void *handle) amdgpu_gem_force_release(adev); amdgpu_vm_manager_fini(adev); kfree(adev->gmc.vm_fault_info); - gmc_v7_0_gart_fini(adev); + amdgpu_gart_table_vram_free(adev); amdgpu_bo_fini(adev); + amdgpu_gart_fini(adev); release_firmware(adev->gmc.fw); adev->gmc.fw = NULL; diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c index 70fc97b59b4f..9333109b210d 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c @@ -968,19 +968,6 @@ static void gmc_v8_0_gart_disable(struct amdgpu_device *adev) amdgpu_gart_table_vram_unpin(adev); } -/** - * gmc_v8_0_gart_fini - vm fini callback - * - * @adev: amdgpu_device pointer - * - * Tears down the driver GART/VM setup (CIK). - */ -static void gmc_v8_0_gart_fini(struct amdgpu_device *adev) -{ - amdgpu_gart_table_vram_free(adev); - amdgpu_gart_fini(adev); -} - /** * gmc_v8_0_vm_decode_fault - print human readable fault info * @@ -1199,8 +1186,9 @@ static int gmc_v8_0_sw_fini(void *handle) amdgpu_gem_force_release(adev); amdgpu_vm_manager_fini(adev); kfree(adev->gmc.vm_fault_info); - gmc_v8_0_gart_fini(adev); + amdgpu_gart_table_vram_free(adev); amdgpu_bo_fini(adev); + amdgpu_gart_fini(adev); release_firmware(adev->gmc.fw); adev->gmc.fw = NULL; diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c index 399a5db27649..72f8018fa2a8 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c @@ -942,26 +942,12 @@ static int gmc_v9_0_sw_init(void *handle) return 0; } -/** - * gmc_v9_0_gart_fini - vm fini callback - * - * @adev: amdgpu_device pointer - * - * Tears down the driver GART/VM setup (CIK). - */ -static void gmc_v9_0_gart_fini(struct amdgpu_device *adev) -{ - amdgpu_gart_table_vram_free(adev); - amdgpu_gart_fini(adev); -} - static int gmc_v9_0_sw_fini(void *handle) { struct amdgpu_device *adev = (struct amdgpu_device *)handle; amdgpu_gem_force_release(adev); amdgpu_vm_manager_fini(adev); - gmc_v9_0_gart_fini(adev); /* * TODO: @@ -974,7 +960,9 @@ static int gmc_v9_0_sw_fini(void *handle) */ amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL, NULL); + amdgpu_gart_table_vram_free(adev); amdgpu_bo_fini(adev); + amdgpu_gart_fini(adev); return 0; } -- 2.30.2