[PATCH] drm/amdgpu: Fix page fault and kasan warning on pci device remove.
Andrey Grodzovsky
andrey.grodzovsky at amd.com
Tue Aug 21 21:23:09 UTC 2018
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 pospone amdgpu_gart_fini to after
memory managers are shut down since gart unbind happens
as part of this procudure.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
1 | 0
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 ++--------------
5 files changed, 8 insertions(+), 49 deletions(-)
create mode 100644 1
diff --git a/1 b/1
new file mode 100644
index 0000000..e69de29
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
index c14cf1c..0a0a4dc 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
@@ -633,12 +633,6 @@ 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)
{
@@ -936,8 +930,9 @@ 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 0c3a161..afbadfc 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
@@ -750,19 +750,6 @@ static void gmc_v7_0_gart_disable(struct amdgpu_device *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
*
* @adev: amdgpu_device pointer
@@ -1091,8 +1078,9 @@ static int gmc_v7_0_sw_fini(void *handle)
amdgpu_gem_force_release(adev);
amdgpu_vm_manager_fini(adev);
- 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 274c932..d871dae 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -969,19 +969,6 @@ static void gmc_v8_0_gart_disable(struct amdgpu_device *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
*
* @adev: amdgpu_device pointer
@@ -1192,8 +1179,9 @@ static int gmc_v8_0_sw_fini(void *handle)
amdgpu_gem_force_release(adev);
amdgpu_vm_manager_fini(adev);
- 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 0bf8439..46183c7 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1003,26 +1003,12 @@ 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:
@@ -1035,7 +1021,9 @@ 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;
}
--
2.7.4
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