From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: Chris Wilson <chris@chris-wilson.co.uk>,
daniel.vetter@ffwll.ch, dri-devel@lists.freedesktop.org,
linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org,
sumit.semwal@linaro.org
Subject: Re: [PATCH 03/10] dma-buf: add dma_fence_array_recycle
Date: Thu, 22 Aug 2019 10:38:10 +0200 [thread overview]
Message-ID: <852e9e9f-5e33-f1e6-f7ee-06c38df4a62e@gmail.com> (raw)
In-Reply-To: <156640466565.20466.15873039258008813430@skylake-alporthouse-com>
Am 21.08.19 um 18:24 schrieb Chris Wilson:
> Quoting Christian König (2019-08-21 13:31:40)
>> Try to recycle an dma_fence_array object by dropping the last
>> reference to it without freeing it.
>>
>> Signed-off-by: Christian König <christian.koenig@amd.com>
>> ---
>> drivers/dma-buf/dma-fence-array.c | 27 +++++++++++++++++++++++++++
>> include/linux/dma-fence-array.h | 1 +
>> 2 files changed, 28 insertions(+)
>>
>> diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
>> index e82f30551aa1..314cf0e881d9 100644
>> --- a/drivers/dma-buf/dma-fence-array.c
>> +++ b/drivers/dma-buf/dma-fence-array.c
>> @@ -188,6 +188,33 @@ void dma_fence_array_init(struct dma_fence_array *array, u64 context,
>> }
>> EXPORT_SYMBOL(dma_fence_array_init);
>>
>> +/**
>> + * dma_fence_array_reuse - dummy for dma_fence_array_recycle
>> + */
>> +static void dma_fence_array_reuse(struct kref *kref)
>> +{
>> + struct dma_fence_array *array = container_of(kref, typeof(*array),
>> + base.refcount);
>> +
>> + WARN_ON_ONCE(!list_empty(&array->base.cb_list));
> [ 77.584694] WARNING: CPU: 3 PID: 627 at drivers/dma-buf/dma-fence-array.c:199 dma_fence_array_recycle+0x1d/0x20
> [ 77.584702] Modules linked in: nls_ascii nls_cp437 vfat fat crct10dif_pclmul i915 crc32_pclmul crc32c_intel aesni_intel aes_x86_64 glue_helper crypto_simd cryptd intel_cstate intel_gtt drm_kms_helper intel_uncore intel_rapl_perf ahci i2c_i801 libahci efivars video button efivarfs
> [ 77.584716] CPU: 3 PID: 627 Comm: gem_busy Tainted: G U 5.3.0-rc5+ #72
> [ 77.584719] Hardware name: Intel Corporation NUC7i5BNK/NUC7i5BNB, BIOS BNKBL357.86A.0052.2017.0918.1346 09/18/2017
> [ 77.584723] RIP: 0010:dma_fence_array_recycle+0x1d/0x20
> [ 77.584726] Code: 5d c3 5b 5d e9 54 f5 ff ff 0f 1f 40 00 f0 ff 4f 38 0f 88 d3 85 14 00 0f 94 c0 74 01 c3 48 8b 57 10 48 83 c7 10 48 39 d7 74 f2 <0f> 0b c3 48 c7 c0 62 88 be 81 c3 0f 1f 84 00 00 00 00 00 48 c7 c0
> [ 77.584730] RSP: 0018:ffffc900001c3c78 EFLAGS: 00010292
> [ 77.584733] RAX: 0000000000000001 RBX: ffff88885ac14b40 RCX: cccccccccccccccd
> [ 77.584735] RDX: 00000012105b0a77 RSI: 0000000000000000 RDI: ffff88885ac14b50
> [ 77.584737] RBP: 0000000000000000 R08: 0000000000000004 R09: 000000000001de00
> [ 77.584740] R10: 00000030f5224012 R11: 00000000000002df R12: ffff88885b58aff0
> [ 77.584742] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88885748e100
> [ 77.584745] FS: 00007f1cd47b19c0(0000) GS:ffff88885eb80000(0000) knlGS:0000000000000000
> [ 77.584748] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 77.584750] CR2: 00007f1cd6719000 CR3: 000000085ac5b002 CR4: 00000000001606e0
> [ 77.584753] Call Trace:
> [ 77.584758] dma_resv_fences_assign.isra.7+0x8d/0x220
> [ 77.584761] dma_resv_prune_fences+0xba/0xc0
> [ 77.584796] i915_gem_object_wait_reservation+0x226/0x240 [i915]
> [ 77.584827] i915_gem_object_wait+0x23/0x40 [i915]
> [ 77.584854] i915_gem_set_domain_ioctl+0xbf/0x240 [i915]
>
> If we signal the fence-array, the cb_list is replaced by the timestamp
> and is no longer considered empty.
Ah, yeah good point I actually wrote that before cb_list and timestamp
shared the same memory.
Christian.
> -Chris
next prev parent reply other threads:[~2019-08-22 8:38 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-21 12:31 [RFC] replacing dma_resv API Christian König
2019-08-21 12:31 ` [PATCH 01/10] dma-buf: make to_dma_fence_array NULL safe Christian König
2019-08-21 12:31 ` [PATCH 02/10] dma-buf: add dma_fence_array_alloc/free Christian König
2019-08-21 12:31 ` [PATCH 03/10] dma-buf: add dma_fence_array_recycle Christian König
2019-08-21 16:24 ` Chris Wilson
2019-08-22 8:38 ` Christian König [this message]
2019-08-21 12:31 ` [PATCH 04/10] dma-buf: add dma_fence_array_for_each Christian König
2019-08-21 12:31 ` [PATCH 05/10] dma-buf/resv: add dma_resv_prune_fences Christian König
2019-08-21 14:55 ` Chris Wilson
2019-08-21 14:56 ` Chris Wilson
2019-08-21 12:31 ` [PATCH 06/10] dma-buf/resv: stop pruning shared fences when exclusive is added Christian König
2019-08-21 12:31 ` [PATCH 07/10] dma-buf/resv: add new fences container implementation Christian König
2019-08-21 16:04 ` Daniel Vetter
2019-08-22 8:23 ` Christian König
2019-08-22 13:02 ` Daniel Vetter
2019-08-22 13:53 ` Koenig, Christian
2019-08-21 12:31 ` [PATCH 08/10] dma-buf/resv: replace shared fence with new fences container Christian König
2019-08-21 15:24 ` Chris Wilson
2019-08-21 17:35 ` Chris Wilson
2019-08-22 8:37 ` Christian König
2019-08-22 9:16 ` Christian König
2019-08-21 16:21 ` Chris Wilson
2019-08-24 13:22 ` Chris Wilson
2019-08-21 12:31 ` [PATCH 09/10] dma-buf/resv: replace exclusive " Christian König
2019-08-21 12:31 ` [PATCH 10/10] dma-buf/resv: add other operations Christian König
2019-08-22 12:28 ` Ville Syrjälä
2019-08-21 16:13 ` [RFC] replacing dma_resv API Daniel Vetter
2019-08-21 20:05 ` Daniel Vetter
2019-08-22 9:27 ` Christian König
2019-08-21 20:11 ` Chris Wilson
2019-08-21 20:22 ` Daniel Vetter
2019-08-22 9:14 ` Christian König
2019-08-22 10:00 ` Daniel Vetter
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