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Date: Tue, 14 Nov 2023 05:40:19 +0000 Message-Id: <20231114054032.1192027-8-hao.xiang@bytedance.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231114054032.1192027-1-hao.xiang@bytedance.com> References: <20231114054032.1192027-1-hao.xiang@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::f2f; envelope-from=hao.xiang@bytedance.com; helo=mail-qv1-xf2f.google.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @bytedance.com) X-ZM-MESSAGEID: 1699940627744100003 Content-Type: text/plain; charset="utf-8" * 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 | 49 +++++++ util/dsa.c | 338 +++++++++++++++++++++++++++++++++++++++++++++ util/meson.build | 1 + 3 files changed, 388 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..30246b507e --- /dev/null +++ b/include/qemu/dsa.h @@ -0,0 +1,49 @@ +#ifndef QEMU_DSA_H +#define QEMU_DSA_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" + +#endif + +/** + * @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 logic to clean up DSA by halting the device group and clean= ing up + * the completion thread. + */ +void dsa_stop(void); + +/** + * @brief Clean up system resources created for DSA offloading. + * This function is called during QEMU process teardown. + */ +void dsa_cleanup(void); + +/** + * @brief Check if DSA is running. + * + * @return True if DSA is running, otherwise false. + */ +bool dsa_is_running(void); + +#endif \ No newline at end of file diff --git a/util/dsa.c b/util/dsa.c new file mode 100644 index 0000000000..8edaa892ec --- /dev/null +++ b/util/dsa.c @@ -0,0 +1,338 @@ +/* + * 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"), t= o deal + * in the Software without restriction, including without limitation the r= ights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or se= ll + * 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 OT= HER + * 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, buffer_zero_batch_task) dsa_task_que= ue; + +struct dsa_device { + void *work_queue; +}; + +struct dsa_device_group { + struct dsa_device *dsa_devices; + int num_dsa_devices; + uint32_t 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. + */ +static void * +map_dsa_device(const char *dsa_wq_path) +{ + void *dsa_device; + int fd; + + fd =3D open(dsa_wq_path, O_RDWR); + if (fd < 0) { + fprintf(stderr, "open %s failed with errno =3D %d.\n", + dsa_wq_path, errno); + return MAP_FAILED; + } + dsa_device =3D mmap(NULL, DSA_WQ_SIZE, PROT_WRITE, + MAP_SHARED | MAP_POPULATE, fd, 0); + close(fd); + if (dsa_device =3D=3D MAP_FAILED) { + fprintf(stderr, "mmap failed with errno =3D %d.\n", 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 =3D 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 !=3D 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 num_dsa_devices The number of DSA devices this group will have. + * + * @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 =3D=3D NULL || strlen(dsa_parameter) =3D=3D 0) { + return 0; + } + + int ret =3D 0; + char *local_dsa_parameter =3D g_strdup(dsa_parameter); + const char *dsa_path[MAX_DSA_DEVICES]; + int num_dsa_devices =3D 0; + char delim[2] =3D " "; + + char *current_dsa_path =3D strtok(local_dsa_parameter, delim); + + while (current_dsa_path !=3D NULL) { + dsa_path[num_dsa_devices++] =3D current_dsa_path; + if (num_dsa_devices =3D=3D MAX_DSA_DEVICES) { + break; + } + current_dsa_path =3D strtok(NULL, delim); + } + + group->dsa_devices =3D + malloc(sizeof(struct dsa_device) * num_dsa_devices); + group->num_dsa_devices =3D num_dsa_devices; + group->index =3D 0; + + group->running =3D false; + qemu_mutex_init(&group->task_queue_lock); + qemu_cond_init(&group->task_queue_cond); + QSIMPLEQ_INIT(&group->task_queue); + + void *dsa_wq =3D MAP_FAILED; + for (int i =3D 0; i < num_dsa_devices; i++) { + dsa_wq =3D map_dsa_device(dsa_path[i]); + if (dsa_wq =3D=3D MAP_FAILED) { + fprintf(stderr, "map_dsa_device failed MAP_FAILED, " + "using simulation.\n"); + ret =3D -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. + * @param dsa_path An array of DSA device path. + * @param num_dsa_devices The number of DSA devices in the device group. + */ +static void +dsa_device_group_start(struct dsa_device_group *group) +{ + group->running =3D 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 =3D 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 =3D 0; i < group->num_dsa_devices; i++) { + dsa_device_cleanup(&group->dsa_devices[i]); + } + free(group->dsa_devices); + group->dsa_devices =3D 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 =3D=3D 0) { + return NULL; + } + uint32_t current =3D qatomic_fetch_inc(&group->index); + current %=3D 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 =3D 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 =3D=3D 0) { + return; + } + if (dsa_group.running) { + return; + } + dsa_device_group_start(&dsa_group); +} + +/** + * @brief Stop logic to clean up DSA by halting the device group and clean= ing up + * the completion thread. + * + */ +void dsa_stop(void) +{ + struct dsa_device_group *group =3D &dsa_group; + + if (!group->running) { + return; + } +} + +/** + * @brief Clean up system resources created for DSA offloading. + * This function is called during QEMU process teardown. + * + */ +void dsa_cleanup(void) +{ + dsa_stop(); + dsa_device_group_cleanup(&dsa_group); +} + +#else + +bool dsa_is_running(void) +{ + return false; +} + +int dsa_init(const char *dsa_parameter) +{ + fprintf(stderr, "Intel Data Streaming Accelerator is not supported " + "on this platform.\n"); + return -1; +} + +void dsa_start(void) {} + +void dsa_stop(void) {} + +void dsa_cleanup(void) {} + +#endif + diff --git a/util/meson.build b/util/meson.build index c2322ef6e7..f7277c5e9b 100644 --- a/util/meson.build +++ b/util/meson.build @@ -85,6 +85,7 @@ 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')) --=20 2.30.2