From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1FE581EA8F for ; Tue, 1 Aug 2023 09:50:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 99583C433C8; Tue, 1 Aug 2023 09:50:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690883444; bh=sJsafFDedZLtkkRHhZ4Zb3t48A2S29HP/j+E2LTYALM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LQrQB6FODlhbaY5DJjvipcY17rn2WgHtLjhEzoaWqqpFy2H2XP1BWVTKbOSq6pdN3 +IIcy3SHb3bKlO9loOeGK4c1cT2k5wiBJ/0AYXZXlIewIERIGmSfrrd9JbKmgGhaNv BjRovD5VnvNAtUse6p4/JN36yS9e+R+G4CSdGfJ0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Christian=20K=C3=B6nig?= , Luben Tuikov , Jindong Yue Subject: [PATCH 6.4 238/239] dma-buf: keep the signaling time of merged fences v3 Date: Tue, 1 Aug 2023 11:21:42 +0200 Message-ID: <20230801091934.639356142@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801091925.659598007@linuxfoundation.org> References: <20230801091925.659598007@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Christian König commit f781f661e8c99b0cb34129f2e374234d61864e77 upstream. Some Android CTS is testing if the signaling time keeps consistent during merges. v2: use the current time if the fence is still in the signaling path and the timestamp not yet available. v3: improve comment, fix one more case to use the correct timestamp Signed-off-by: Christian König Reviewed-by: Luben Tuikov Link: https://patchwork.freedesktop.org/patch/msgid/20230630120041.109216-1-christian.koenig@amd.com Cc: Jindong Yue Signed-off-by: Greg Kroah-Hartman --- drivers/dma-buf/dma-fence-unwrap.c | 26 ++++++++++++++++++++++---- drivers/dma-buf/dma-fence.c | 5 +++-- drivers/gpu/drm/drm_syncobj.c | 2 +- include/linux/dma-fence.h | 2 +- 4 files changed, 27 insertions(+), 8 deletions(-) --- a/drivers/dma-buf/dma-fence-unwrap.c +++ b/drivers/dma-buf/dma-fence-unwrap.c @@ -66,18 +66,36 @@ struct dma_fence *__dma_fence_unwrap_mer { struct dma_fence_array *result; struct dma_fence *tmp, **array; + ktime_t timestamp; unsigned int i; size_t count; count = 0; + timestamp = ns_to_ktime(0); for (i = 0; i < num_fences; ++i) { - dma_fence_unwrap_for_each(tmp, &iter[i], fences[i]) - if (!dma_fence_is_signaled(tmp)) + dma_fence_unwrap_for_each(tmp, &iter[i], fences[i]) { + if (!dma_fence_is_signaled(tmp)) { ++count; + } else if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, + &tmp->flags)) { + if (ktime_after(tmp->timestamp, timestamp)) + timestamp = tmp->timestamp; + } else { + /* + * Use the current time if the fence is + * currently signaling. + */ + timestamp = ktime_get(); + } + } } + /* + * If we couldn't find a pending fence just return a private signaled + * fence with the timestamp of the last signaled one. + */ if (count == 0) - return dma_fence_get_stub(); + return dma_fence_allocate_private_stub(timestamp); array = kmalloc_array(count, sizeof(*array), GFP_KERNEL); if (!array) @@ -138,7 +156,7 @@ restart: } while (tmp); if (count == 0) { - tmp = dma_fence_get_stub(); + tmp = dma_fence_allocate_private_stub(ktime_get()); goto return_tmp; } --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -150,10 +150,11 @@ EXPORT_SYMBOL(dma_fence_get_stub); /** * dma_fence_allocate_private_stub - return a private, signaled fence + * @timestamp: timestamp when the fence was signaled * * Return a newly allocated and signaled stub fence. */ -struct dma_fence *dma_fence_allocate_private_stub(void) +struct dma_fence *dma_fence_allocate_private_stub(ktime_t timestamp) { struct dma_fence *fence; @@ -169,7 +170,7 @@ struct dma_fence *dma_fence_allocate_pri set_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags); - dma_fence_signal(fence); + dma_fence_signal_timestamp(fence, timestamp); return fence; } --- a/drivers/gpu/drm/drm_syncobj.c +++ b/drivers/gpu/drm/drm_syncobj.c @@ -353,7 +353,7 @@ EXPORT_SYMBOL(drm_syncobj_replace_fence) */ static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj) { - struct dma_fence *fence = dma_fence_allocate_private_stub(); + struct dma_fence *fence = dma_fence_allocate_private_stub(ktime_get()); if (IS_ERR(fence)) return PTR_ERR(fence); --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -606,7 +606,7 @@ static inline signed long dma_fence_wait void dma_fence_set_deadline(struct dma_fence *fence, ktime_t deadline); struct dma_fence *dma_fence_get_stub(void); -struct dma_fence *dma_fence_allocate_private_stub(void); +struct dma_fence *dma_fence_allocate_private_stub(ktime_t timestamp); u64 dma_fence_context_alloc(unsigned num); extern const struct dma_fence_ops dma_fence_array_ops;