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Mon, 12 May 2025 08:17:33 +0000 Message-ID: <48ca64e8-09a8-4321-a84a-e33f2d32e552@amd.com> Date: Mon, 12 May 2025 10:17:28 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [RFC v2 03/13] dma-fence: Use a flag for 64-bit seqnos To: Tvrtko Ursulin , dri-devel@lists.freedesktop.org Cc: Sumit Semwal , Gustavo Padovan , Matthew Brost , Lucas De Marchi , Rodrigo Vivi , amd-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, kernel-dev@igalia.com References: <20250509153352.7187-1-tvrtko.ursulin@igalia.com> <20250509153352.7187-4-tvrtko.ursulin@igalia.com> Content-Language: en-US From: =?UTF-8?Q?Christian_K=C3=B6nig?= In-Reply-To: <20250509153352.7187-4-tvrtko.ursulin@igalia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: FR4P281CA0029.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:c9::14) To PH7PR12MB5685.namprd12.prod.outlook.com (2603:10b6:510:13c::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR12MB5685:EE_|PH7PR12MB7113:EE_ X-MS-Office365-Filtering-Correlation-Id: b22eb230-beed-4910-f574-08dd912d726e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Reviewed-by: Christian König > --- > drivers/dma-buf/dma-fence-chain.c | 5 ++--- > drivers/dma-buf/dma-fence.c | 9 +++++++++ > drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c | 5 ++--- > include/linux/dma-fence.h | 6 +++++- > 4 files changed, 18 insertions(+), 7 deletions(-) > > diff --git a/drivers/dma-buf/dma-fence-chain.c b/drivers/dma-buf/dma-fence-chain.c > index 90424f23fd73..a8a90acf4f34 100644 > --- a/drivers/dma-buf/dma-fence-chain.c > +++ b/drivers/dma-buf/dma-fence-chain.c > @@ -218,7 +218,6 @@ static void dma_fence_chain_set_deadline(struct dma_fence *fence, > } > > const struct dma_fence_ops dma_fence_chain_ops = { > - .use_64bit_seqno = true, > .get_driver_name = dma_fence_chain_get_driver_name, > .get_timeline_name = dma_fence_chain_get_timeline_name, > .enable_signaling = dma_fence_chain_enable_signaling, > @@ -262,8 +261,8 @@ void dma_fence_chain_init(struct dma_fence_chain *chain, > seqno = max(prev->seqno, seqno); > } > > - dma_fence_init(&chain->base, &dma_fence_chain_ops, > - &chain->lock, context, seqno); > + dma_fence_init64(&chain->base, &dma_fence_chain_ops, &chain->lock, > + context, seqno); > > /* > * Chaining dma_fence_chain container together is only allowed through > diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c > index f0cdd3e99d36..33661658f684 100644 > --- a/drivers/dma-buf/dma-fence.c > +++ b/drivers/dma-buf/dma-fence.c > @@ -1023,3 +1023,12 @@ dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops, > trace_dma_fence_init(fence); > } > EXPORT_SYMBOL(dma_fence_init); > + > +void > +dma_fence_init64(struct dma_fence *fence, const struct dma_fence_ops *ops, > + spinlock_t *lock, u64 context, u64 seqno) > +{ > + dma_fence_init(fence, ops, lock, context, seqno); > + __set_bit(DMA_FENCE_FLAG_SEQNO64_BIT, &fence->flags); > +} > +EXPORT_SYMBOL(dma_fence_init64); > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c > index 51cddfa3f1e8..5d26797356a3 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c > @@ -71,7 +71,6 @@ static void amdgpu_tlb_fence_work(struct work_struct *work) > } > > static const struct dma_fence_ops amdgpu_tlb_fence_ops = { > - .use_64bit_seqno = true, > .get_driver_name = amdgpu_tlb_fence_get_driver_name, > .get_timeline_name = amdgpu_tlb_fence_get_timeline_name > }; > @@ -101,8 +100,8 @@ void amdgpu_vm_tlb_fence_create(struct amdgpu_device *adev, struct amdgpu_vm *vm > INIT_WORK(&f->work, amdgpu_tlb_fence_work); > spin_lock_init(&f->lock); > > - dma_fence_init(&f->base, &amdgpu_tlb_fence_ops, &f->lock, > - vm->tlb_fence_context, atomic64_read(&vm->tlb_seq)); > + dma_fence_init64(&f->base, &amdgpu_tlb_fence_ops, &f->lock, > + vm->tlb_fence_context, atomic64_read(&vm->tlb_seq)); > > /* TODO: We probably need a separate wq here */ > dma_fence_get(&f->base); > diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h > index 48b5202c531d..ac6535716dbe 100644 > --- a/include/linux/dma-fence.h > +++ b/include/linux/dma-fence.h > @@ -97,6 +97,7 @@ struct dma_fence { > }; > > enum dma_fence_flag_bits { > + DMA_FENCE_FLAG_SEQNO64_BIT, > DMA_FENCE_FLAG_SIGNALED_BIT, > DMA_FENCE_FLAG_TIMESTAMP_BIT, > DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, > @@ -262,6 +263,9 @@ struct dma_fence_ops { > void dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops, > spinlock_t *lock, u64 context, u64 seqno); > > +void dma_fence_init64(struct dma_fence *fence, const struct dma_fence_ops *ops, > + spinlock_t *lock, u64 context, u64 seqno); > + > void dma_fence_release(struct kref *kref); > void dma_fence_free(struct dma_fence *fence); > void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq); > @@ -454,7 +458,7 @@ static inline bool __dma_fence_is_later(struct dma_fence *fence, u64 f1, u64 f2) > * 32bit sequence numbers. Use a 64bit compare when the driver says to > * do so. > */ > - if (fence->ops->use_64bit_seqno) > + if (test_bit(DMA_FENCE_FLAG_SEQNO64_BIT, &fence->flags)) > return f1 > f2; > > return (int)(lower_32_bits(f1) - lower_32_bits(f2)) > 0;