Re: [PATCH 09/11] drm/syncobj: add transition iotcls between binary and timeline

[Lionel Landwerlin via amd-gfx <amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>]

Hi David,

Thanks a lot for point me to the tests you've added in IGT.
While adding a test with that signals fences imported into a timeline 
syncobj out of order, I ran into a deadlock.
Here is the test : 
https://github.com/djdeath/intel-gpu-tools/commit/1e46cf7e7bff09b78a24367ddc2314f97eb0a1b9

Trying to kill the deadlocked process I got this backtrace :


[   33.969136] [IGT] syncobj_timeline: starting subtest signal-order
[   60.452823] watchdog: BUG: soft lockup - CPU#6 stuck for 23s! 
[syncobj_timelin:2021]
[   60.452826] Modules linked in: rfcomm cmac bnep binfmt_misc 
nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek 
snd_hda_codec_generic ledtrig_audio sch_fq_codel ib_iser snd_hda_intel 
rdma_cm iw_cm snd_hda_codec ib_cm snd_hda_core snd_hwdep intel_rapl 
snd_pcm ib_core x86_pkg_temp_thermal intel_powerclamp configf
s coretemp iscsi_tcp snd_seq_midi libiscsi_tcp snd_seq_midi_event 
libiscsi kvm_intel scsi_transport_iscsi kvm btusb snd_rawmidi irqbypass 
btrtl intel_cstate intel_rapl_perf btbcm btintel bluetooth snd_seq 
snd_seq_device snd_timer input_leds ecdh_generic snd soundcore mei_me 
mei intel_pch_thermal mac_hid acpi_pad parp
ort_pc ppdev lp parport ip_tables x_tables autofs4 btrfs zstd_decompress 
zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq 
async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear 
hid_generic usbhid hid i915 crct10dif_pclmul crc32_pclmul i2c_algo_bit 
ghash_clmulni_intel prime_numbers
drm_kms_helper aesni_intel syscopyarea sysfillrect
[   60.452876]  sysimgblt fb_sys_fops aes_x86_64 crypto_simd sdhci_pci 
cryptd drm e1000e glue_helper cqhci sdhci wmi video
[   60.452881] CPU: 6 PID: 2021 Comm: syncobj_timelin Tainted: G     
U            5.0.0-rc5+ #337
[   60.452882] Hardware name:  /NUC6i7KYB, BIOS 
KYSKLi70.86A.0042.2016.0929.1933 09/29/2016
[   60.452886] RIP: 0010:dma_fence_chain_walk+0x22c/0x260
[   60.452888] Code: ff e9 93 fe ff ff 48 8b 45 08 48 8b 40 18 48 85 c0 
74 0c 48 89 ef e8 33 0f 58 00 84 c0 75 23 f0 41 ff 4d 00 0f 88 99 87 2f 
00 <0f> 85 05 fe ff ff 4c 89 ef e8 56 ea ff ff 48 89 d8 5b 5d 41 5c 41
[   60.452888] RSP: 0018:ffff9a5804653ca8 EFLAGS: 00010296 ORIG_RAX: 
ffffffffffffff13
[   60.452889] RAX: 0000000000000000 RBX: ffff8f5690fb2480 RCX: 
ffff8f5690fb2f00
[   60.452890] RDX: 00000000003e3730 RSI: 0000000000000000 RDI: 
ffff8f5690fb2180
[   60.452891] RBP: ffff8f5690fb2180 R08: 0000000000000000 R09: 
ffff8f5690fb2eb0
[   60.452891] R10: 0000000000000000 R11: ffff8f5660469860 R12: 
ffff8f5690fb2f68
[   60.452892] R13: ffff8f5690fb2f00 R14: 0000000000000003 R15: 
ffff8f5655a45fc0
[   60.452913] FS:  00007fdc5c459980(0000) GS:ffff8f569eb80000(0000) 
knlGS:0000000000000000
[   60.452913] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   60.452914] CR2: 00007f9d74336dd8 CR3: 000000084a67e004 CR4: 
00000000003606e0
[   60.452915] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[   60.452915] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
[   60.452916] Call Trace:
[   60.452958]  drm_syncobj_add_point+0x102/0x160 [drm]
[   60.452965]  ? drm_syncobj_fd_to_handle_ioctl+0x1b0/0x1b0 [drm]
[   60.452971]  drm_syncobj_transfer_ioctl+0x10f/0x180 [drm]
[   60.452978]  drm_ioctl_kernel+0xac/0xf0 [drm]
[   60.452984]  drm_ioctl+0x2eb/0x3b0 [drm]
[   60.452990]  ? drm_syncobj_fd_to_handle_ioctl+0x1b0/0x1b0 [drm]
[   60.452992]  ? sw_sync_ioctl+0x347/0x370
[   60.452994]  do_vfs_ioctl+0xa4/0x640
[   60.452995]  ? __fput+0x134/0x220
[   60.452997]  ? do_fcntl+0x1a5/0x650
[   60.452998]  ksys_ioctl+0x70/0x80
[   60.452999]  __x64_sys_ioctl+0x16/0x20
[   60.453002]  do_syscall_64+0x55/0x110
[   60.453004]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   60.453005] RIP: 0033:0x7fdc5b6e45d7
[   60.453006] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 
48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
[   60.453007] RSP: 002b:00007fff25c4d198 EFLAGS: 00000206 ORIG_RAX: 
0000000000000010
[   60.453008] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 
00007fdc5b6e45d7
[   60.453008] RDX: 00007fff25c4d200 RSI: 00000000c02064cc RDI: 
0000000000000003
[   60.453009] RBP: 00007fff25c4d1d0 R08: 0000000000000000 R09: 
000000000000001e
[   60.453010] R10: 0000000000000000 R11: 0000000000000206 R12: 
0000563d3959e4d0
[   60.453010] R13: 00007fff25c4d620 R14: 0000000000000000 R15: 
0000000000000000
[   88.447359] watchdog: BUG: soft lockup - CPU#6 stuck for 22s! 
[syncobj_timelin:2021]


-Lionel


On 07/12/2018 09:55, Chunming Zhou wrote:
> we need to import/export timeline point
>
> Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
> ---
>   drivers/gpu/drm/drm_internal.h |  4 +++
>   drivers/gpu/drm/drm_ioctl.c    |  6 ++++
>   drivers/gpu/drm/drm_syncobj.c  | 66 ++++++++++++++++++++++++++++++++++
>   include/uapi/drm/drm.h         | 10 ++++++
>   4 files changed, 86 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
> index dab4d5936441..ecbe3d51a702 100644
> --- a/drivers/gpu/drm/drm_internal.h
> +++ b/drivers/gpu/drm/drm_internal.h
> @@ -176,6 +176,10 @@ int drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
>   				   struct drm_file *file_private);
>   int drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
>   				   struct drm_file *file_private);
> +int drm_syncobj_binary_to_timeline_ioctl(struct drm_device *dev, void *data,
> +					 struct drm_file *file_private);
> +int drm_syncobj_timeline_to_binary_ioctl(struct drm_device *dev, void *data,
> +					 struct drm_file *file_private);
>   int drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
>   			   struct drm_file *file_private);
>   int drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index 7578ef6dc1d1..6b417e3c3ea5 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -673,6 +673,12 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
>   		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
>   	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
>   		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
> +	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_BINARY_TO_TIMELINE,
> +		      drm_syncobj_binary_to_timeline_ioctl,
> +		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
> +	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_TO_BINARY,
> +		      drm_syncobj_timeline_to_binary_ioctl,
> +		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
>   	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
>   		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
>   	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl,
> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
> index 282982e58dbd..cf4daa670252 100644
> --- a/drivers/gpu/drm/drm_syncobj.c
> +++ b/drivers/gpu/drm/drm_syncobj.c
> @@ -670,6 +670,72 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
>   					&args->handle);
>   }
>   
> +int
> +drm_syncobj_binary_to_timeline_ioctl(struct drm_device *dev, void *data,
> +				     struct drm_file *file_private)
> +{
> +	struct drm_syncobj_transfer *args = data;
> +	struct drm_syncobj *timeline_syncobj = NULL;
> +	struct dma_fence *fence;
> +	struct dma_fence_chain *chain;
> +	int ret;
> +
> +	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
> +		return -ENODEV;
> +
> +	if (args->pad)
> +		return -EINVAL;
> +
> +	timeline_syncobj = drm_syncobj_find(file_private, args->timeline_handle);
> +	if (!timeline_syncobj) {
> +		return -ENOENT;
> +	}
> +	ret = drm_syncobj_find_fence(file_private, args->binary_handle, 0, 0,
> +				     &fence);
> +	if (ret)
> +		goto err;
> +	chain = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
> +	if (!chain)
> +		goto err1;
> +	drm_syncobj_add_point(timeline_syncobj, chain, fence, args->point);
> +err1:
> +	dma_fence_put(fence);
> +err:
> +	drm_syncobj_put(timeline_syncobj);
> +
> +	return ret;
> +}
> +
> +int
> +drm_syncobj_timeline_to_binary_ioctl(struct drm_device *dev, void *data,
> +				     struct drm_file *file_private)
> +{
> +	struct drm_syncobj_transfer *args = data;
> +	struct drm_syncobj *binary_syncobj = NULL;
> +	struct dma_fence *fence;
> +	int ret;
> +
> +	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
> +		return -ENODEV;
> +
> +	if (args->pad)
> +		return -EINVAL;
> +
> +	binary_syncobj = drm_syncobj_find(file_private, args->binary_handle);
> +	if (!binary_syncobj)
> +		return -ENOENT;
> +	ret = drm_syncobj_find_fence(file_private, args->timeline_handle,
> +				     args->point, args->flags, &fence);
> +	if (ret)
> +		goto err;
> +	drm_syncobj_replace_fence(binary_syncobj, fence);
> +	dma_fence_put(fence);
> +err:
> +	drm_syncobj_put(binary_syncobj);
> +
> +	return ret;
> +}
> +
>   static void syncobj_wait_fence_func(struct dma_fence *fence,
>   				    struct dma_fence_cb *cb)
>   {
> diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
> index b2c36f2b2599..88d6129d4a18 100644
> --- a/include/uapi/drm/drm.h
> +++ b/include/uapi/drm/drm.h
> @@ -735,6 +735,14 @@ struct drm_syncobj_handle {
>   	__u32 pad;
>   };
>   
> +struct drm_syncobj_transfer {
> +	__u32 binary_handle;
> +	__u32 timeline_handle;
> +	__u64 point;
> +	__u32 flags;
> +	__u32 pad;
> +};
> +
>   #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL (1 << 0)
>   #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT (1 << 1)
>   #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE (1 << 2)
> @@ -933,6 +941,8 @@ extern "C" {
>   
>   #define DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT	DRM_IOWR(0xCA, struct drm_syncobj_timeline_wait)
>   #define DRM_IOCTL_SYNCOBJ_QUERY		DRM_IOWR(0xCB, struct drm_syncobj_timeline_array)
> +#define DRM_IOCTL_SYNCOBJ_BINARY_TO_TIMELINE	DRM_IOWR(0xCC, struct drm_syncobj_transfer)
> +#define DRM_IOCTL_SYNCOBJ_TIMELINE_TO_BINARY	DRM_IOWR(0xCD, struct drm_syncobj_transfer)
>   
>   /**
>    * Device specific ioctls should only be in their respective headers


_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx