From patchwork Thu Apr 25 02:21:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xiang X-Patchwork-Id: 13642791 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 875E7C10F15 for ; Thu, 25 Apr 2024 02:24:54 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rzokw-0000Tj-VN; Wed, 24 Apr 2024 22:22:38 -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 1rzokt-0000T1-0D for qemu-devel@nongnu.org; Wed, 24 Apr 2024 22:22:35 -0400 Received: from out-189.mta1.migadu.com ([2001:41d0:203:375::bd]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rzokq-0004rm-Hz for qemu-devel@nongnu.org; Wed, 24 Apr 2024 22:22:34 -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=1714011749; 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=NAbh7BYnj26RaAM2u77UOr3YjU1pxmHehljVAEbJqZw=; b=m7Z/FjumLtnmFqg/xRYOYNe1qZwJ1MwS5pF0I1q4OJJaRaZxqGve7EtbQuv9HBG1MEbQ+I XcPbGyZ5Ofso4SaUw7yzcEEO6QDT9/jyfsyXKQZauXoUjg0tCUeziFyk5Fa4ZfnEi6sbSR shRril6IEt4ajJb8oamJv6k0V2Plrsk= 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 , Bryan Zhang Subject: [PATCH v4 03/14] util/dsa: Implement DSA device start and stop logic. Date: Thu, 25 Apr 2024 02:21:06 +0000 Message-Id: <20240425022117.4035031-4-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::bd; envelope-from=hao.xiang@linux.dev; helo=out-189.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 * DSA device open and close. * DSA group contains multiple DSA devices. * DSA group configure/start/stop/clean. Signed-off-by: Hao Xiang Signed-off-by: Bryan Zhang --- include/qemu/dsa.h | 72 +++++++++++ util/dsa.c | 316 +++++++++++++++++++++++++++++++++++++++++++++ util/meson.build | 1 + 3 files changed, 389 insertions(+) create mode 100644 include/qemu/dsa.h create mode 100644 util/dsa.c diff --git a/include/qemu/dsa.h b/include/qemu/dsa.h new file mode 100644 index 0000000000..f15c05ee85 --- /dev/null +++ b/include/qemu/dsa.h @@ -0,0 +1,72 @@ +#ifndef QEMU_DSA_H +#define QEMU_DSA_H + +#include "qemu/error-report.h" +#include "qemu/thread.h" +#include "qemu/queue.h" + +#ifdef CONFIG_DSA_OPT + +#pragma GCC push_options +#pragma GCC target("enqcmd") + +#include +#include "x86intrin.h" + +/** + * @brief Initializes DSA devices. + * + * @param dsa_parameter A list of DSA device path from migration parameter. + * + * @return int Zero if successful, otherwise non zero. + */ +int dsa_init(const char *dsa_parameter); + +/** + * @brief Start logic to enable using DSA. + */ +void dsa_start(void); + +/** + * @brief Stop the device group and the completion thread. + */ +void dsa_stop(void); + +/** + * @brief Clean up system resources created for DSA offloading. + */ +void dsa_cleanup(void); + +/** + * @brief Check if DSA is running. + * + * @return True if DSA is running, otherwise false. + */ +bool dsa_is_running(void); + +#else + +static inline bool dsa_is_running(void) +{ + return false; +} + +static inline int dsa_init(const char *dsa_parameter) +{ + if (dsa_parameter != NULL && strlen(dsa_parameter) != 0) { + error_report("DSA not supported."); + return -1; + } + + return 0; +} + +static inline void dsa_start(void) {} + +static inline void dsa_stop(void) {} + +static inline void dsa_cleanup(void) {} + +#endif + +#endif diff --git a/util/dsa.c b/util/dsa.c new file mode 100644 index 0000000000..05bbf8e31a --- /dev/null +++ b/util/dsa.c @@ -0,0 +1,316 @@ +/* + * Use Intel Data Streaming Accelerator to offload certain background + * operations. + * + * Copyright (c) 2023 Hao Xiang + * Bryan Zhang + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" +#include "qemu/queue.h" +#include "qemu/memalign.h" +#include "qemu/lockable.h" +#include "qemu/cutils.h" +#include "qemu/dsa.h" +#include "qemu/bswap.h" +#include "qemu/error-report.h" +#include "qemu/rcu.h" + +#ifdef CONFIG_DSA_OPT + +#pragma GCC push_options +#pragma GCC target("enqcmd") + +#include +#include "x86intrin.h" + +#define DSA_WQ_SIZE 4096 +#define MAX_DSA_DEVICES 16 + +typedef QSIMPLEQ_HEAD(dsa_task_queue, dsa_batch_task) dsa_task_queue; + +struct dsa_device { + void *work_queue; +}; + +struct dsa_device_group { + struct dsa_device *dsa_devices; + int num_dsa_devices; + /* The index of the next DSA device to be used. */ + uint32_t device_allocator_index; + bool running; + QemuMutex task_queue_lock; + QemuCond task_queue_cond; + dsa_task_queue task_queue; +}; + +uint64_t max_retry_count; +static struct dsa_device_group dsa_group; + + +/** + * @brief This function opens a DSA device's work queue and + * maps the DSA device memory into the current process. + * + * @param dsa_wq_path A pointer to the DSA device work queue's file path. + * @return A pointer to the mapped memory, or MAP_FAILED on failure. + */ +static void * +map_dsa_device(const char *dsa_wq_path) +{ + void *dsa_device; + int fd; + + fd = open(dsa_wq_path, O_RDWR); + if (fd < 0) { + error_report("Open %s failed with errno = %d.", + dsa_wq_path, errno); + return MAP_FAILED; + } + dsa_device = mmap(NULL, DSA_WQ_SIZE, PROT_WRITE, + MAP_SHARED | MAP_POPULATE, fd, 0); + close(fd); + if (dsa_device == MAP_FAILED) { + error_report("mmap failed with errno = %d.", errno); + return MAP_FAILED; + } + return dsa_device; +} + +/** + * @brief Initializes a DSA device structure. + * + * @param instance A pointer to the DSA device. + * @param work_queue A pointer to the DSA work queue. + */ +static void +dsa_device_init(struct dsa_device *instance, + void *dsa_work_queue) +{ + instance->work_queue = dsa_work_queue; +} + +/** + * @brief Cleans up a DSA device structure. + * + * @param instance A pointer to the DSA device to cleanup. + */ +static void +dsa_device_cleanup(struct dsa_device *instance) +{ + if (instance->work_queue != MAP_FAILED) { + munmap(instance->work_queue, DSA_WQ_SIZE); + } +} + +/** + * @brief Initializes a DSA device group. + * + * @param group A pointer to the DSA device group. + * @param dsa_parameter A list of DSA device path from are separated by space + * character migration parameter. Multiple DSA device path. + * + * @return Zero if successful, non-zero otherwise. + */ +static int +dsa_device_group_init(struct dsa_device_group *group, + const char *dsa_parameter) +{ + if (dsa_parameter == NULL || strlen(dsa_parameter) == 0) { + return 0; + } + + int ret = 0; + char *local_dsa_parameter = g_strdup(dsa_parameter); + const char *dsa_path[MAX_DSA_DEVICES]; + int num_dsa_devices = 0; + char delim[2] = " "; + + char *current_dsa_path = strtok(local_dsa_parameter, delim); + + while (current_dsa_path != NULL) { + dsa_path[num_dsa_devices++] = current_dsa_path; + if (num_dsa_devices == MAX_DSA_DEVICES) { + break; + } + current_dsa_path = strtok(NULL, delim); + } + + group->dsa_devices = + g_new0(struct dsa_device, num_dsa_devices); + group->num_dsa_devices = num_dsa_devices; + group->device_allocator_index = 0; + + group->running = false; + qemu_mutex_init(&group->task_queue_lock); + qemu_cond_init(&group->task_queue_cond); + QSIMPLEQ_INIT(&group->task_queue); + + void *dsa_wq = MAP_FAILED; + for (int i = 0; i < num_dsa_devices; i++) { + dsa_wq = map_dsa_device(dsa_path[i]); + if (dsa_wq == MAP_FAILED) { + error_report("map_dsa_device failed MAP_FAILED."); + ret = -1; + goto exit; + } + dsa_device_init(&dsa_group.dsa_devices[i], dsa_wq); + } + +exit: + g_free(local_dsa_parameter); + return ret; +} + +/** + * @brief Starts a DSA device group. + * + * @param group A pointer to the DSA device group. + */ +static void +dsa_device_group_start(struct dsa_device_group *group) +{ + group->running = true; +} + +/** + * @brief Stops a DSA device group. + * + * @param group A pointer to the DSA device group. + */ +__attribute__((unused)) +static void +dsa_device_group_stop(struct dsa_device_group *group) +{ + group->running = false; +} + +/** + * @brief Cleans up a DSA device group. + * + * @param group A pointer to the DSA device group. + */ +static void +dsa_device_group_cleanup(struct dsa_device_group *group) +{ + if (!group->dsa_devices) { + return; + } + for (int i = 0; i < group->num_dsa_devices; i++) { + dsa_device_cleanup(&group->dsa_devices[i]); + } + g_free(group->dsa_devices); + group->dsa_devices = NULL; + + qemu_mutex_destroy(&group->task_queue_lock); + qemu_cond_destroy(&group->task_queue_cond); +} + +/** + * @brief Returns the next available DSA device in the group. + * + * @param group A pointer to the DSA device group. + * + * @return struct dsa_device* A pointer to the next available DSA device + * in the group. + */ +__attribute__((unused)) +static struct dsa_device * +dsa_device_group_get_next_device(struct dsa_device_group *group) +{ + if (group->num_dsa_devices == 0) { + return NULL; + } + uint32_t current = qatomic_fetch_inc(&group->device_allocator_index); + current %= group->num_dsa_devices; + return &group->dsa_devices[current]; +} + +/** + * @brief Check if DSA is running. + * + * @return True if DSA is running, otherwise false. + */ +bool dsa_is_running(void) +{ + return false; +} + +static void +dsa_globals_init(void) +{ + max_retry_count = UINT64_MAX; +} + +/** + * @brief Initializes DSA devices. + * + * @param dsa_parameter A list of DSA device path from migration parameter. + * + * @return int Zero if successful, otherwise non zero. + */ +int dsa_init(const char *dsa_parameter) +{ + dsa_globals_init(); + + return dsa_device_group_init(&dsa_group, dsa_parameter); +} + +/** + * @brief Start logic to enable using DSA. + * + */ +void dsa_start(void) +{ + if (dsa_group.num_dsa_devices == 0) { + return; + } + if (dsa_group.running) { + return; + } + dsa_device_group_start(&dsa_group); +} + +/** + * @brief Stop the device group and the completion thread. + * + */ +void dsa_stop(void) +{ + struct dsa_device_group *group = &dsa_group; + + if (!group->running) { + return; + } +} + +/** + * @brief Clean up system resources created for DSA offloading. + * + */ +void dsa_cleanup(void) +{ + dsa_stop(); + dsa_device_group_cleanup(&dsa_group); +} + +#endif + diff --git a/util/meson.build b/util/meson.build index 2ad57b10ba..144c6812e5 100644 --- a/util/meson.build +++ b/util/meson.build @@ -88,6 +88,7 @@ if have_block or have_ga endif if have_block util_ss.add(files('aio-wait.c')) + util_ss.add(files('dsa.c')) util_ss.add(files('buffer.c')) util_ss.add(files('bufferiszero.c')) util_ss.add(files('hbitmap.c'))