From patchwork Thu Apr 25 02:21:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13642787 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 1B979C10F15 for ; Thu, 25 Apr 2024 02:23:43 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rzol0-0000W1-LL; Wed, 24 Apr 2024 22:22:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rzokw-0000Tk-Vh for qemu-devel@nongnu.org; Wed, 24 Apr 2024 22:22:38 -0400 Received: from out-173.mta1.migadu.com ([2001:41d0:203:375::ad]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rzoku-00054g-9n for qemu-devel@nongnu.org; Wed, 24 Apr 2024 22:22:38 -0400 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1714011754; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VNJkfGyi2rtj7X7uudx4KFAw0gzv12DqnHcWYmGz0MA=; b=NGx2I39l8uAUMKGB8OxQOCrx7ur06QI5C0ZruaX2B9pqQ655ukd4Vaik7Yr8LMp0m6mTr8 z9qnACHKOYnGOofJL9be/QGweMpjvUZboDNWvuxiELYX5uMdQXpLvt0qCMKN+sJO0z+JqE B1KV/RvkhXghMmIfpCxusDLrYXZvzJs= From: Hao Xiang To: marcandre.lureau@redhat.com, peterx@redhat.com, farosas@suse.de, armbru@redhat.com, lvivier@redhat.com, qemu-devel@nongnu.org Cc: Hao Xiang Subject: [PATCH v4 05/14] util/dsa: Implement DSA task asynchronous completion thread model. Date: Thu, 25 Apr 2024 02:21:08 +0000 Message-Id: <20240425022117.4035031-6-hao.xiang@linux.dev> In-Reply-To: <20240425022117.4035031-1-hao.xiang@linux.dev> References: <20240425022117.4035031-1-hao.xiang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=2001:41d0:203:375::ad; envelope-from=hao.xiang@linux.dev; helo=out-173.mta1.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org * Create a dedicated thread for DSA task completion. * DSA completion thread runs a loop and poll for completed tasks. * Start and stop DSA completion thread during DSA device start stop. User space application can directly submit task to Intel DSA accelerator by writing to DSA's device memory (mapped in user space). Once a task is submitted, the device starts processing it and write the completion status back to the task. A user space application can poll the task's completion status to check for completion. This change uses a dedicated thread to perform DSA task completion checking. Signed-off-by: Hao Xiang --- include/qemu/dsa.h | 1 + util/dsa.c | 274 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 274 insertions(+), 1 deletion(-) diff --git a/include/qemu/dsa.h b/include/qemu/dsa.h index 37cae8d9d2..2513192a2b 100644 --- a/include/qemu/dsa.h +++ b/include/qemu/dsa.h @@ -38,6 +38,7 @@ typedef struct dsa_batch_task { DsaTaskType task_type; DsaTaskStatus status; int batch_size; + bool *results; QSIMPLEQ_ENTRY(dsa_batch_task) entry; } dsa_batch_task; diff --git a/util/dsa.c b/util/dsa.c index 75739a1af6..003c4f47d9 100644 --- a/util/dsa.c +++ b/util/dsa.c @@ -44,6 +44,7 @@ #define DSA_WQ_SIZE 4096 #define MAX_DSA_DEVICES 16 +#define DSA_COMPLETION_THREAD "dsa_completion" typedef QSIMPLEQ_HEAD(dsa_task_queue, dsa_batch_task) dsa_task_queue; @@ -62,8 +63,18 @@ struct dsa_device_group { dsa_task_queue task_queue; }; +struct dsa_completion_thread { + bool stopping; + bool running; + QemuThread thread; + int thread_id; + QemuSemaphore sem_init_done; + struct dsa_device_group *group; +}; + uint64_t max_retry_count; static struct dsa_device_group dsa_group; +static struct dsa_completion_thread completion_thread; /** @@ -443,6 +454,265 @@ submit_batch_wi_async(struct dsa_batch_task *batch_task) return dsa_task_enqueue(device_group, batch_task); } +/** + * @brief Poll for the DSA work item completion. + * + * @param completion A pointer to the DSA work item completion record. + * @param opcode The DSA opcode. + * + * @return Zero if successful, non-zero otherwise. + */ +static int +poll_completion(struct dsa_completion_record *completion, + enum dsa_opcode opcode) +{ + uint8_t status; + uint64_t retry = 0; + + while (true) { + /* The DSA operation completes successfully or fails. */ + status = completion->status; + if (status == DSA_COMP_SUCCESS || + status == DSA_COMP_PAGE_FAULT_NOBOF || + status == DSA_COMP_BATCH_PAGE_FAULT || + status == DSA_COMP_BATCH_FAIL) { + break; + } else if (status != DSA_COMP_NONE) { + error_report("DSA opcode %d failed with status = %d.", + opcode, status); + return 1; + } + retry++; + if (retry > max_retry_count) { + error_report("DSA wait for completion retry %lu times.", retry); + return 1; + } + _mm_pause(); + } + + return 0; +} + +/** + * @brief Complete a single DSA task in the batch task. + * + * @param task A pointer to the batch task structure. + * + * @return Zero if successful, otherwise non-zero. + */ +static int +poll_task_completion(struct dsa_batch_task *task) +{ + assert(task->task_type == DSA_TASK); + + struct dsa_completion_record *completion = &task->completions[0]; + uint8_t status; + int ret; + + ret = poll_completion(completion, task->descriptors[0].opcode); + if (ret != 0) { + goto exit; + } + + status = completion->status; + if (status == DSA_COMP_SUCCESS) { + task->results[0] = (completion->result == 0); + goto exit; + } + + assert(status == DSA_COMP_PAGE_FAULT_NOBOF); + +exit: + return ret; +} + +/** + * @brief Poll a batch task status until it completes. If DSA task doesn't + * complete properly, use CPU to complete the task. + * + * @param batch_task A pointer to the DSA batch task. + * + * @return Zero if successful, otherwise non-zero. + */ +static int +poll_batch_task_completion(struct dsa_batch_task *batch_task) +{ + struct dsa_completion_record *batch_completion = + &batch_task->batch_completion; + struct dsa_completion_record *completion; + uint8_t batch_status; + uint8_t status; + bool *results = batch_task->results; + uint32_t count = batch_task->batch_descriptor.desc_count; + int ret; + + ret = poll_completion(batch_completion, + batch_task->batch_descriptor.opcode); + if (ret != 0) { + goto exit; + } + + batch_status = batch_completion->status; + + if (batch_status == DSA_COMP_SUCCESS) { + if (batch_completion->bytes_completed == count) { + /* + * Let's skip checking for each descriptors' completion status + * if the batch descriptor says all succedded. + */ + for (int i = 0; i < count; i++) { + assert(batch_task->completions[i].status == DSA_COMP_SUCCESS); + results[i] = (batch_task->completions[i].result == 0); + } + goto exit; + } + } else { + assert(batch_status == DSA_COMP_BATCH_FAIL || + batch_status == DSA_COMP_BATCH_PAGE_FAULT); + } + + for (int i = 0; i < count; i++) { + + completion = &batch_task->completions[i]; + status = completion->status; + + if (status == DSA_COMP_SUCCESS) { + results[i] = (completion->result == 0); + continue; + } + + assert(status == DSA_COMP_PAGE_FAULT_NOBOF); + + if (status != DSA_COMP_PAGE_FAULT_NOBOF) { + error_report("Unexpected DSA completion status = %u.", status); + ret = 1; + goto exit; + } + } + +exit: + return ret; +} + +/** + * @brief Handles an asynchronous DSA batch task completion. + * + * @param task A pointer to the batch buffer zero task structure. + */ +static void +dsa_batch_task_complete(struct dsa_batch_task *batch_task) +{ + batch_task->status = DSA_TASK_COMPLETION; + batch_task->completion_callback(batch_task); +} + +/** + * @brief The function entry point called by a dedicated DSA + * work item completion thread. + * + * @param opaque A pointer to the thread context. + * + * @return void* Not used. + */ +static void * +dsa_completion_loop(void *opaque) +{ + struct dsa_completion_thread *thread_context = + (struct dsa_completion_thread *)opaque; + struct dsa_batch_task *batch_task; + struct dsa_device_group *group = thread_context->group; + int ret; + + rcu_register_thread(); + + thread_context->thread_id = qemu_get_thread_id(); + qemu_sem_post(&thread_context->sem_init_done); + + while (thread_context->running) { + batch_task = dsa_task_dequeue(group); + assert(batch_task != NULL || !group->running); + if (!group->running) { + assert(!thread_context->running); + break; + } + if (batch_task->task_type == DSA_TASK) { + ret = poll_task_completion(batch_task); + } else { + assert(batch_task->task_type == DSA_BATCH_TASK); + ret = poll_batch_task_completion(batch_task); + } + + if (ret != 0) { + goto exit; + } + + dsa_batch_task_complete(batch_task); + } + +exit: + if (ret != 0) { + error_report("DSA completion thread exited due to internal error."); + } + rcu_unregister_thread(); + return NULL; +} + +/** + * @brief Initializes a DSA completion thread. + * + * @param completion_thread A pointer to the completion thread context. + * @param group A pointer to the DSA device group. + */ +static void +dsa_completion_thread_init( + struct dsa_completion_thread *completion_thread, + struct dsa_device_group *group) +{ + completion_thread->stopping = false; + completion_thread->running = true; + completion_thread->thread_id = -1; + qemu_sem_init(&completion_thread->sem_init_done, 0); + completion_thread->group = group; + + qemu_thread_create(&completion_thread->thread, + DSA_COMPLETION_THREAD, + dsa_completion_loop, + completion_thread, + QEMU_THREAD_JOINABLE); + + /* Wait for initialization to complete */ + qemu_sem_wait(&completion_thread->sem_init_done); +} + +/** + * @brief Stops the completion thread (and implicitly, the device group). + * + * @param opaque A pointer to the completion thread. + */ +static void dsa_completion_thread_stop(void *opaque) +{ + struct dsa_completion_thread *thread_context = + (struct dsa_completion_thread *)opaque; + + struct dsa_device_group *group = thread_context->group; + + qemu_mutex_lock(&group->task_queue_lock); + + thread_context->stopping = true; + thread_context->running = false; + + /* Prevent the compiler from setting group->running first. */ + barrier(); + dsa_device_group_stop(group); + + qemu_cond_signal(&group->task_queue_cond); + qemu_mutex_unlock(&group->task_queue_lock); + + qemu_thread_join(&thread_context->thread); + + qemu_sem_destroy(&thread_context->sem_init_done); +} + /** * @brief Check if DSA is running. * @@ -450,7 +720,7 @@ submit_batch_wi_async(struct dsa_batch_task *batch_task) */ bool dsa_is_running(void) { - return false; + return completion_thread.running; } static void @@ -486,6 +756,7 @@ void dsa_start(void) return; } dsa_device_group_start(&dsa_group); + dsa_completion_thread_init(&completion_thread, &dsa_group); } /** @@ -500,6 +771,7 @@ void dsa_stop(void) return; } + dsa_completion_thread_stop(&completion_thread); dsa_empty_task_queue(group); }