From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D1AFEC02181 for ; Sun, 26 Jan 2025 14:55:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7CB5310E3FD; Sun, 26 Jan 2025 14:55:56 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="e84pl3ES"; dkim-atps=neutral Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id C4B2710E3FD; Sun, 26 Jan 2025 14:55:53 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 0BF775C3ED2; Sun, 26 Jan 2025 14:55:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8A2A6C4CEE2; Sun, 26 Jan 2025 14:55:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737903352; bh=ly/BdMUaVxNlKvJsf6GwQTYCCYOjN30/2pIEhO5hXnI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e84pl3ESw23lyBNAll0IwGfYPgZYtppc0G56cWpkB58kZlyM3wu5z8QniWdwmXMwu DyXFIIUUockybDuIGL4OhZziDIeiPInIN05KQD6edU86vaJ77z3ten47BqJ/NreEAs iyOLMIbp9qtVxZvs4KplIS29RiGz1cwXXWphUlq2TpDNHDr/xN6WYkAVyoqmmdIloF FJTaW56WcAsEpkCtM3bC0BDG5o/EGWIN33TY3ajkX5JcSweuacHXUsYgiaWDNEOwF/ n7CPOg8s00IcbbtI53uNCVCkT6ndXJwTegr6PKi0/HC2SSs/j8I/qRngRpD5yc6+eS vY3j9n7XBFcXw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Philip Yang , Felix Kuehling , Alex Deucher , Sasha Levin , Felix.Kuehling@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, simona@ffwll.ch, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.12 22/31] drm/amdkfd: Queue interrupt work to different CPU Date: Sun, 26 Jan 2025 09:54:38 -0500 Message-Id: <20250126145448.930220-22-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250126145448.930220-1-sashal@kernel.org> References: <20250126145448.930220-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.11 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Philip Yang [ Upstream commit 34db5a32617d102e8042151bb87590e43c97132e ] For CPX mode, each KFD node has interrupt worker to process ih_fifo to send events to user space. Currently all interrupt workers of same adev queue to same CPU, all workers execution are actually serialized and this cause KFD ih_fifo overflow when CPU usage is high. Use per-GPU unbounded highpri queue with number of workers equals to number of partitions, let queue_work select the next CPU round robin among the local CPUs of same NUMA. Signed-off-by: Philip Yang Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdkfd/kfd_device.c | 25 ++++++++-------------- drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c | 25 ++++++++-------------- drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 3 ++- 3 files changed, 20 insertions(+), 33 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c index b05be24531e18..d350c7ce35b3d 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c @@ -637,6 +637,14 @@ static void kfd_cleanup_nodes(struct kfd_dev *kfd, unsigned int num_nodes) struct kfd_node *knode; unsigned int i; + /* + * flush_work ensures that there are no outstanding + * work-queue items that will access interrupt_ring. New work items + * can't be created because we stopped interrupt handling above. + */ + flush_workqueue(kfd->ih_wq); + destroy_workqueue(kfd->ih_wq); + for (i = 0; i < num_nodes; i++) { knode = kfd->nodes[i]; device_queue_manager_uninit(knode->dqm); @@ -1058,21 +1066,6 @@ static int kfd_resume(struct kfd_node *node) return err; } -static inline void kfd_queue_work(struct workqueue_struct *wq, - struct work_struct *work) -{ - int cpu, new_cpu; - - cpu = new_cpu = smp_processor_id(); - do { - new_cpu = cpumask_next(new_cpu, cpu_online_mask) % nr_cpu_ids; - if (cpu_to_node(new_cpu) == numa_node_id()) - break; - } while (cpu != new_cpu); - - queue_work_on(new_cpu, wq, work); -} - /* This is called directly from KGD at ISR. */ void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry) { @@ -1098,7 +1091,7 @@ void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry) patched_ihre, &is_patched) && enqueue_ih_ring_entry(node, is_patched ? patched_ihre : ih_ring_entry)) { - kfd_queue_work(node->ih_wq, &node->interrupt_work); + queue_work(node->kfd->ih_wq, &node->interrupt_work); spin_unlock_irqrestore(&node->interrupt_lock, flags); return; } diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c b/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c index 9b6b6e8825934..15b4b70cf1997 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c @@ -62,11 +62,14 @@ int kfd_interrupt_init(struct kfd_node *node) return r; } - node->ih_wq = alloc_workqueue("KFD IH", WQ_HIGHPRI, 1); - if (unlikely(!node->ih_wq)) { - kfifo_free(&node->ih_fifo); - dev_err(node->adev->dev, "Failed to allocate KFD IH workqueue\n"); - return -ENOMEM; + if (!node->kfd->ih_wq) { + node->kfd->ih_wq = alloc_workqueue("KFD IH", WQ_HIGHPRI | WQ_UNBOUND, + node->kfd->num_nodes); + if (unlikely(!node->kfd->ih_wq)) { + kfifo_free(&node->ih_fifo); + dev_err(node->adev->dev, "Failed to allocate KFD IH workqueue\n"); + return -ENOMEM; + } } spin_lock_init(&node->interrupt_lock); @@ -96,16 +99,6 @@ void kfd_interrupt_exit(struct kfd_node *node) spin_lock_irqsave(&node->interrupt_lock, flags); node->interrupts_active = false; spin_unlock_irqrestore(&node->interrupt_lock, flags); - - /* - * flush_work ensures that there are no outstanding - * work-queue items that will access interrupt_ring. New work items - * can't be created because we stopped interrupt handling above. - */ - flush_workqueue(node->ih_wq); - - destroy_workqueue(node->ih_wq); - kfifo_free(&node->ih_fifo); } @@ -162,7 +155,7 @@ static void interrupt_wq(struct work_struct *work) /* If we spent more than a second processing signals, * reschedule the worker to avoid soft-lockup warnings */ - queue_work(dev->ih_wq, &dev->interrupt_work); + queue_work(dev->kfd->ih_wq, &dev->interrupt_work); break; } } diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h index 26e48fdc87289..75523f30cd38b 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h @@ -273,7 +273,6 @@ struct kfd_node { /* Interrupts */ struct kfifo ih_fifo; - struct workqueue_struct *ih_wq; struct work_struct interrupt_work; spinlock_t interrupt_lock; @@ -366,6 +365,8 @@ struct kfd_dev { struct kfd_node *nodes[MAX_KFD_NODES]; unsigned int num_nodes; + struct workqueue_struct *ih_wq; + /* Kernel doorbells for KFD device */ struct amdgpu_bo *doorbells; -- 2.39.5