On Thu, Feb 27, 2020 at 7:46 AM Yintian Tao <yttao@xxxxxxx> wrote:
>
> drm_minor_unregister will invoke drm_debugfs_cleanup
> to clean all the child node under primary minor node.
> We don't need to invoke amdgpu_debugfs_fini and
> amdgpu_debugfs_regs_cleanup to clean agian.
> Otherwise, it will raise the NULL pointer like below.
> [ 45.046029] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8
> [ 45.047256] PGD 0 P4D 0
> [ 45.047713] Oops: 0002 [#1] SMP PTI
> [ 45.048198] CPU: 0 PID: 2796 Comm: modprobe Tainted: G W OE 4.18.0-15-generic #16~18.04.1-Ubuntu
> [ 45.049538] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> [ 45.050651] RIP: 0010:down_write+0x1f/0x40
> [ 45.051194] Code: 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb e8 ce d9 ff ff 48 ba 01 00 00 00 ff ff ff ff 48 89 d8 <f0> 48 0f c1 10 85 d2 74 05 e8 53 1c ff ff 65 48 8b 04 25 00 5c 01
> [ 45.053702] RSP: 0018:ffffad8f4133fd40 EFLAGS: 00010246
> [ 45.054384] RAX: 00000000000000a8 RBX: 00000000000000a8 RCX: ffffa011327dd814
> [ 45.055349] RDX: ffffffff00000001 RSI: 0000000000000001 RDI: 00000000000000a8
> [ 45.056346] RBP: ffffad8f4133fd48 R08: 0000000000000000 R09: ffffffffc0690a00
> [ 45.057326] R10: ffffad8f4133fd58 R11: 0000000000000001 R12: ffffa0113cff0300
> [ 45.058266] R13: ffffa0113c0a0000 R14: ffffffffc0c02a10 R15: ffffa0113e5c7860
> [ 45.059221] FS: 00007f60d46f9540(0000) GS:ffffa0113fc00000(0000) knlGS:0000000000000000
> [ 45.060809] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 45.061826] CR2: 00000000000000a8 CR3: 0000000136250004 CR4: 00000000003606f0
> [ 45.062913] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 45.064404] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 45.065897] Call Trace:
> [ 45.066426] debugfs_remove+0x36/0xa0
> [ 45.067131] amdgpu_debugfs_ring_fini+0x15/0x20 [amdgpu]
> [ 45.068019] amdgpu_debugfs_fini+0x2c/0x50 [amdgpu]
> [ 45.068756] amdgpu_pci_remove+0x49/0x70 [amdgpu]
> [ 45.069439] pci_device_remove+0x3e/0xc0
> [ 45.070037] device_release_driver_internal+0x18a/0x260
> [ 45.070842] driver_detach+0x3f/0x80
> [ 45.071325] bus_remove_driver+0x59/0xd0
> [ 45.071850] driver_unregister+0x2c/0x40
> [ 45.072377] pci_unregister_driver+0x22/0xa0
> [ 45.073043] amdgpu_exit+0x15/0x57c [amdgpu]
> [ 45.073683] __x64_sys_delete_module+0x146/0x280
> [ 45.074369] do_syscall_64+0x5a/0x120
> [ 45.074916] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> v2: remove all debugfs cleanup/fini code at amdgpu
>
> Signed-off-by: Yintian Tao <yttao@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 30 ---------------------
> drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h | 1 -
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 -
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 -
> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 7 -----
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 10 -------
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 1 -
> 7 files changed, 51 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> index 3bb74056b9d2..abc148280ba5 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> @@ -992,18 +992,6 @@ int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
> return 0;
> }
>
> -void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev)
> -{
> - unsigned i;
> -
> - for (i = 0; i < ARRAY_SIZE(debugfs_regs); i++) {
> - if (adev->debugfs_regs[i]) {
> - debugfs_remove(adev->debugfs_regs[i]);
> - adev->debugfs_regs[i] = NULL;
> - }
> - }
> -}
> -
> static int amdgpu_debugfs_test_ib(struct seq_file *m, void *data)
> {
> struct drm_info_node *node = (struct drm_info_node *) m->private;
> @@ -1339,31 +1327,13 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
> ARRAY_SIZE(amdgpu_debugfs_list));
> }
>
> -void amdgpu_debugfs_fini(struct amdgpu_device *adev)
> -{
> - int i;
> -
> - for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> - struct amdgpu_ring *ring = adev->rings[i];
> -
> - if (!ring)
> - continue;
> -
> - amdgpu_debugfs_ring_fini(ring);
> - }
> - amdgpu_ttm_debugfs_fini(adev);
> - debugfs_remove(adev->debugfs_preempt);
> -}
> -
> #else
> int amdgpu_debugfs_init(struct amdgpu_device *adev)
> {
> return 0;
> }
> -void amdgpu_debugfs_fini(struct amdgpu_device *adev) { }
> int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
> {
> return 0;
> }
> -void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev) { }
> #endif
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
> index b382527e359a..de12d1101526 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
> @@ -32,7 +32,6 @@ struct amdgpu_debugfs {
> };
>
> int amdgpu_debugfs_regs_init(struct amdgpu_device *adev);
> -void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev);
> int amdgpu_debugfs_init(struct amdgpu_device *adev);
> void amdgpu_debugfs_fini(struct amdgpu_device *adev);
> int amdgpu_debugfs_add_files(struct amdgpu_device *adev,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 8ef8a49b9255..351096ab4301 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3237,7 +3237,6 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
> adev->rmmio = NULL;
> amdgpu_device_doorbell_fini(adev);
>
> - amdgpu_debugfs_regs_cleanup(adev);
> device_remove_file(adev->dev, &dev_attr_pcie_replay_count);
> if (adev->ucode_sysfs_en)
> amdgpu_ucode_sysfs_fini(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 7cf5f597b90a..02d80b9dbfe1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -1139,7 +1139,6 @@ amdgpu_pci_remove(struct pci_dev *pdev)
> DRM_ERROR("Hotplug removal is not supported\n");
> drm_dev_unplug(dev);
> drm_dev_put(dev);
> - amdgpu_debugfs_fini(adev);
> amdgpu_driver_unload_kms(dev);
> pci_disable_device(pdev);
> pci_set_drvdata(pdev, NULL);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> index 18e11b0fdc3e..ca6b52054b4b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> @@ -499,13 +499,6 @@ int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
> return 0;
> }
>
> -void amdgpu_debugfs_ring_fini(struct amdgpu_ring *ring)
> -{
> -#if defined(CONFIG_DEBUG_FS)
> - debugfs_remove(ring->ent);
> -#endif
> -}
> -
> /**
> * amdgpu_ring_test_helper - tests ring and set sched readiness status
> *
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 660867cf2597..1947a326de57 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -2571,13 +2571,3 @@ int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
> return 0;
> #endif
> }
> -
> -void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev)
> -{
> -#if defined(CONFIG_DEBUG_FS)
> - unsigned i;
> -
> - for (i = 0; i < ARRAY_SIZE(ttm_debugfs_entries); i++)
> - debugfs_remove(adev->mman.debugfs_entries[i]);
> -#endif
> -}
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index 2c4ad5b589d0..dc6502d1060b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -134,6 +134,5 @@ uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
> struct ttm_mem_reg *mem);
>
> int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev);
> -void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
>
> #endif
> --
> 2.17.1
>
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