--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_eal_memconfig.h>
+
+#include "eal_filesystem.h"
+#include "eal_vfio.h"
+#include "eal_private.h"
+
+#ifdef VFIO_PRESENT
+
+/* per-process VFIO config */
+static struct vfio_config vfio_cfg;
+
+static int vfio_type1_dma_map(int);
+static int vfio_noiommu_dma_map(int);
+
+/* IOMMU types we support */
+static const struct vfio_iommu_type iommu_types[] = {
+ /* x86 IOMMU, otherwise known as type 1 */
+ { RTE_VFIO_TYPE1, "Type 1", &vfio_type1_dma_map},
+ /* IOMMU-less mode */
+ { RTE_VFIO_NOIOMMU, "No-IOMMU", &vfio_noiommu_dma_map},
+};
+
+int
+vfio_get_group_fd(int iommu_group_no)
+{
+ int i;
+ int vfio_group_fd;
+ char filename[PATH_MAX];
+
+ /* check if we already have the group descriptor open */
+ for (i = 0; i < vfio_cfg.vfio_group_idx; i++)
+ if (vfio_cfg.vfio_groups[i].group_no == iommu_group_no)
+ return vfio_cfg.vfio_groups[i].fd;
+
+ /* if primary, try to open the group */
+ if (internal_config.process_type == RTE_PROC_PRIMARY) {
+ /* try regular group format */
+ snprintf(filename, sizeof(filename),
+ VFIO_GROUP_FMT, iommu_group_no);
+ vfio_group_fd = open(filename, O_RDWR);
+ if (vfio_group_fd < 0) {
+ /* if file not found, it's not an error */
+ if (errno != ENOENT) {
+ RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename,
+ strerror(errno));
+ return -1;
+ }
+
+ /* special case: try no-IOMMU path as well */
+ snprintf(filename, sizeof(filename),
+ VFIO_NOIOMMU_GROUP_FMT, iommu_group_no);
+ vfio_group_fd = open(filename, O_RDWR);
+ if (vfio_group_fd < 0) {
+ if (errno != ENOENT) {
+ RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename,
+ strerror(errno));
+ return -1;
+ }
+ return 0;
+ }
+ /* noiommu group found */
+ }
+
+ /* if the fd is valid, create a new group for it */
+ if (vfio_cfg.vfio_group_idx == VFIO_MAX_GROUPS) {
+ RTE_LOG(ERR, EAL, "Maximum number of VFIO groups reached!\n");
+ close(vfio_group_fd);
+ return -1;
+ }
+ vfio_cfg.vfio_groups[vfio_cfg.vfio_group_idx].group_no = iommu_group_no;
+ vfio_cfg.vfio_groups[vfio_cfg.vfio_group_idx].fd = vfio_group_fd;
+ return vfio_group_fd;
+ }
+ /* if we're in a secondary process, request group fd from the primary
+ * process via our socket
+ */
+ else {
+ int socket_fd, ret;
+
+ socket_fd = vfio_mp_sync_connect_to_primary();
+
+ if (socket_fd < 0) {
+ RTE_LOG(ERR, EAL, " cannot connect to primary process!\n");
+ return -1;
+ }
+ if (vfio_mp_sync_send_request(socket_fd, SOCKET_REQ_GROUP) < 0) {
+ RTE_LOG(ERR, EAL, " cannot request container fd!\n");
+ close(socket_fd);
+ return -1;
+ }
+ if (vfio_mp_sync_send_request(socket_fd, iommu_group_no) < 0) {
+ RTE_LOG(ERR, EAL, " cannot send group number!\n");
+ close(socket_fd);
+ return -1;
+ }
+ ret = vfio_mp_sync_receive_request(socket_fd);
+ switch (ret) {
+ case SOCKET_NO_FD:
+ close(socket_fd);
+ return 0;
+ case SOCKET_OK:
+ vfio_group_fd = vfio_mp_sync_receive_fd(socket_fd);
+ /* if we got the fd, return it */
+ if (vfio_group_fd > 0) {
+ close(socket_fd);
+ return vfio_group_fd;
+ }
+ /* fall-through on error */
+ default:
+ RTE_LOG(ERR, EAL, " cannot get container fd!\n");
+ close(socket_fd);
+ return -1;
+ }
+ }
+ return -1;
+}
+
+static void
+clear_current_group(void)
+{
+ vfio_cfg.vfio_groups[vfio_cfg.vfio_group_idx].group_no = 0;
+ vfio_cfg.vfio_groups[vfio_cfg.vfio_group_idx].fd = -1;
+}
+
+int vfio_setup_device(const char *sysfs_base, const char *dev_addr,
+ int *vfio_dev_fd, struct vfio_device_info *device_info)
+{
+ struct vfio_group_status group_status = {
+ .argsz = sizeof(group_status)
+ };
+ int vfio_group_fd;
+ int iommu_group_no;
+ int ret;
+
+ /* get group number */
+ ret = vfio_get_group_no(sysfs_base, dev_addr, &iommu_group_no);
+ if (ret == 0) {
+ RTE_LOG(WARNING, EAL, " %s not managed by VFIO driver, skipping\n",
+ dev_addr);
+ return 1;
+ }
+
+ /* if negative, something failed */
+ if (ret < 0)
+ return -1;
+
+ /* get the actual group fd */
+ vfio_group_fd = vfio_get_group_fd(iommu_group_no);
+ if (vfio_group_fd < 0)
+ return -1;
+
+ /* store group fd */
+ vfio_cfg.vfio_groups[vfio_cfg.vfio_group_idx].group_no = iommu_group_no;
+ vfio_cfg.vfio_groups[vfio_cfg.vfio_group_idx].fd = vfio_group_fd;
+
+ /* if group_fd == 0, that means the device isn't managed by VFIO */
+ if (vfio_group_fd == 0) {
+ RTE_LOG(WARNING, EAL, " %s not managed by VFIO driver, skipping\n",
+ dev_addr);
+ /* we store 0 as group fd to distinguish between existing but
+ * unbound VFIO groups, and groups that don't exist at all.
+ */
+ vfio_cfg.vfio_group_idx++;
+ return 1;
+ }
+
+ /*
+ * at this point, we know that this group is viable (meaning, all devices
+ * are either bound to VFIO or not bound to anything)
+ */
+
+ /* check if the group is viable */
+ ret = ioctl(vfio_group_fd, VFIO_GROUP_GET_STATUS, &group_status);
+ if (ret) {
+ RTE_LOG(ERR, EAL, " %s cannot get group status, "
+ "error %i (%s)\n", dev_addr, errno, strerror(errno));
+ close(vfio_group_fd);
+ clear_current_group();
+ return -1;
+ } else if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
+ RTE_LOG(ERR, EAL, " %s VFIO group is not viable!\n", dev_addr);
+ close(vfio_group_fd);
+ clear_current_group();
+ return -1;
+ }
+
+ /* check if group does not have a container yet */
+ if (!(group_status.flags & VFIO_GROUP_FLAGS_CONTAINER_SET)) {
+
+ /* add group to a container */
+ ret = ioctl(vfio_group_fd, VFIO_GROUP_SET_CONTAINER,
+ &vfio_cfg.vfio_container_fd);
+ if (ret) {
+ RTE_LOG(ERR, EAL, " %s cannot add VFIO group to container, "
+ "error %i (%s)\n", dev_addr, errno, strerror(errno));
+ close(vfio_group_fd);
+ clear_current_group();
+ return -1;
+ }
+ /*
+ * at this point we know that this group has been successfully
+ * initialized, so we increment vfio_group_idx to indicate that we can
+ * add new groups.
+ */
+ vfio_cfg.vfio_group_idx++;
+ }
+
+ /*
+ * pick an IOMMU type and set up DMA mappings for container
+ *
+ * needs to be done only once, only when at least one group is assigned to
+ * a container and only in primary process
+ */
+ if (internal_config.process_type == RTE_PROC_PRIMARY &&
+ vfio_cfg.vfio_container_has_dma == 0) {
+ /* select an IOMMU type which we will be using */
+ const struct vfio_iommu_type *t =
+ vfio_set_iommu_type(vfio_cfg.vfio_container_fd);
+ if (!t) {
+ RTE_LOG(ERR, EAL, " %s failed to select IOMMU type\n", dev_addr);
+ return -1;
+ }
+ ret = t->dma_map_func(vfio_cfg.vfio_container_fd);
+ if (ret) {
+ RTE_LOG(ERR, EAL, " %s DMA remapping failed, "
+ "error %i (%s)\n", dev_addr, errno, strerror(errno));
+ return -1;
+ }
+ vfio_cfg.vfio_container_has_dma = 1;
+ }
+
+ /* get a file descriptor for the device */
+ *vfio_dev_fd = ioctl(vfio_group_fd, VFIO_GROUP_GET_DEVICE_FD, dev_addr);
+ if (*vfio_dev_fd < 0) {
+ /* if we cannot get a device fd, this simply means that this
+ * particular port is not bound to VFIO
+ */
+ RTE_LOG(WARNING, EAL, " %s not managed by VFIO driver, skipping\n",
+ dev_addr);
+ return 1;
+ }
+
+ /* test and setup the device */
+ ret = ioctl(*vfio_dev_fd, VFIO_DEVICE_GET_INFO, device_info);
+ if (ret) {
+ RTE_LOG(ERR, EAL, " %s cannot get device info, "
+ "error %i (%s)\n", dev_addr, errno, strerror(errno));
+ close(*vfio_dev_fd);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+vfio_enable(const char *modname)
+{
+ /* initialize group list */
+ int i;
+ int vfio_available;
+
+ for (i = 0; i < VFIO_MAX_GROUPS; i++) {
+ vfio_cfg.vfio_groups[i].fd = -1;
+ vfio_cfg.vfio_groups[i].group_no = -1;
+ }
+
+ /* inform the user that we are probing for VFIO */
+ RTE_LOG(INFO, EAL, "Probing VFIO support...\n");
+
+ /* check if vfio-pci module is loaded */
+ vfio_available = rte_eal_check_module(modname);
+
+ /* return error directly */
+ if (vfio_available == -1) {
+ RTE_LOG(INFO, EAL, "Could not get loaded module details!\n");
+ return -1;
+ }
+
+ /* return 0 if VFIO modules not loaded */
+ if (vfio_available == 0) {
+ RTE_LOG(DEBUG, EAL, "VFIO modules not loaded, "
+ "skipping VFIO support...\n");
+ return 0;
+ }
+
+ vfio_cfg.vfio_container_fd = vfio_get_container_fd();
+
+ /* check if we have VFIO driver enabled */
+ if (vfio_cfg.vfio_container_fd != -1) {
+ RTE_LOG(NOTICE, EAL, "VFIO support initialized\n");
+ vfio_cfg.vfio_enabled = 1;
+ } else {
+ RTE_LOG(NOTICE, EAL, "VFIO support could not be initialized\n");
+ }
+
+ return 0;
+}
+
+int
+vfio_is_enabled(const char *modname)
+{
+ const int mod_available = rte_eal_check_module(modname);
+ return vfio_cfg.vfio_enabled && mod_available;
+}
+
+const struct vfio_iommu_type *
+vfio_set_iommu_type(int vfio_container_fd) {
+ unsigned idx;
+ for (idx = 0; idx < RTE_DIM(iommu_types); idx++) {
+ const struct vfio_iommu_type *t = &iommu_types[idx];
+
+ int ret = ioctl(vfio_container_fd, VFIO_SET_IOMMU,
+ t->type_id);
+ if (!ret) {
+ RTE_LOG(NOTICE, EAL, " using IOMMU type %d (%s)\n",
+ t->type_id, t->name);
+ return t;
+ }
+ /* not an error, there may be more supported IOMMU types */
+ RTE_LOG(DEBUG, EAL, " set IOMMU type %d (%s) failed, "
+ "error %i (%s)\n", t->type_id, t->name, errno,
+ strerror(errno));
+ }
+ /* if we didn't find a suitable IOMMU type, fail */
+ return NULL;
+}
+
+int
+vfio_has_supported_extensions(int vfio_container_fd) {
+ int ret;
+ unsigned idx, n_extensions = 0;
+ for (idx = 0; idx < RTE_DIM(iommu_types); idx++) {
+ const struct vfio_iommu_type *t = &iommu_types[idx];
+
+ ret = ioctl(vfio_container_fd, VFIO_CHECK_EXTENSION,
+ t->type_id);
+ if (ret < 0) {
+ RTE_LOG(ERR, EAL, " could not get IOMMU type, "
+ "error %i (%s)\n", errno,
+ strerror(errno));
+ close(vfio_container_fd);
+ return -1;
+ } else if (ret == 1) {
+ /* we found a supported extension */
+ n_extensions++;
+ }
+ RTE_LOG(DEBUG, EAL, " IOMMU type %d (%s) is %s\n",
+ t->type_id, t->name,
+ ret ? "supported" : "not supported");
+ }
+
+ /* if we didn't find any supported IOMMU types, fail */
+ if (!n_extensions) {
+ close(vfio_container_fd);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+vfio_get_container_fd(void)
+{
+ int ret, vfio_container_fd;
+
+ /* if we're in a primary process, try to open the container */
+ if (internal_config.process_type == RTE_PROC_PRIMARY) {
+ vfio_container_fd = open(VFIO_CONTAINER_PATH, O_RDWR);
+ if (vfio_container_fd < 0) {
+ RTE_LOG(ERR, EAL, " cannot open VFIO container, "
+ "error %i (%s)\n", errno, strerror(errno));
+ return -1;
+ }
+
+ /* check VFIO API version */
+ ret = ioctl(vfio_container_fd, VFIO_GET_API_VERSION);
+ if (ret != VFIO_API_VERSION) {
+ if (ret < 0)
+ RTE_LOG(ERR, EAL, " could not get VFIO API version, "
+ "error %i (%s)\n", errno, strerror(errno));
+ else
+ RTE_LOG(ERR, EAL, " unsupported VFIO API version!\n");
+ close(vfio_container_fd);
+ return -1;
+ }
+
+ ret = vfio_has_supported_extensions(vfio_container_fd);
+ if (ret) {
+ RTE_LOG(ERR, EAL, " no supported IOMMU "
+ "extensions found!\n");
+ return -1;
+ }
+
+ return vfio_container_fd;
+ } else {
+ /*
+ * if we're in a secondary process, request container fd from the
+ * primary process via our socket
+ */
+ int socket_fd;
+
+ socket_fd = vfio_mp_sync_connect_to_primary();
+ if (socket_fd < 0) {
+ RTE_LOG(ERR, EAL, " cannot connect to primary process!\n");
+ return -1;
+ }
+ if (vfio_mp_sync_send_request(socket_fd, SOCKET_REQ_CONTAINER) < 0) {
+ RTE_LOG(ERR, EAL, " cannot request container fd!\n");
+ close(socket_fd);
+ return -1;
+ }
+ vfio_container_fd = vfio_mp_sync_receive_fd(socket_fd);
+ if (vfio_container_fd < 0) {
+ RTE_LOG(ERR, EAL, " cannot get container fd!\n");
+ close(socket_fd);
+ return -1;
+ }
+ close(socket_fd);
+ return vfio_container_fd;
+ }
+
+ return -1;
+}
+
+int
+vfio_get_group_no(const char *sysfs_base,
+ const char *dev_addr, int *iommu_group_no)
+{
+ char linkname[PATH_MAX];
+ char filename[PATH_MAX];
+ char *tok[16], *group_tok, *end;
+ int ret;
+
+ memset(linkname, 0, sizeof(linkname));
+ memset(filename, 0, sizeof(filename));
+
+ /* try to find out IOMMU group for this device */
+ snprintf(linkname, sizeof(linkname),
+ "%s/%s/iommu_group", sysfs_base, dev_addr);
+
+ ret = readlink(linkname, filename, sizeof(filename));
+
+ /* if the link doesn't exist, no VFIO for us */
+ if (ret < 0)
+ return 0;
+
+ ret = rte_strsplit(filename, sizeof(filename),
+ tok, RTE_DIM(tok), '/');
+
+ if (ret <= 0) {
+ RTE_LOG(ERR, EAL, " %s cannot get IOMMU group\n", dev_addr);
+ return -1;
+ }
+
+ /* IOMMU group is always the last token */
+ errno = 0;
+ group_tok = tok[ret - 1];
+ end = group_tok;
+ *iommu_group_no = strtol(group_tok, &end, 10);
+ if ((end != group_tok && *end != '\0') || errno != 0) {
+ RTE_LOG(ERR, EAL, " %s error parsing IOMMU number!\n", dev_addr);
+ return -1;
+ }
+
+ return 1;
+}
+
+static int
+vfio_type1_dma_map(int vfio_container_fd)
+{
+ const struct rte_memseg *ms = rte_eal_get_physmem_layout();
+ int i, ret;
+
+ /* map all DPDK segments for DMA. use 1:1 PA to IOVA mapping */
+ for (i = 0; i < RTE_MAX_MEMSEG; i++) {
+ struct vfio_iommu_type1_dma_map dma_map;
+
+ if (ms[i].addr == NULL)
+ break;
+
+ memset(&dma_map, 0, sizeof(dma_map));
+ dma_map.argsz = sizeof(struct vfio_iommu_type1_dma_map);
+ dma_map.vaddr = ms[i].addr_64;
+ dma_map.size = ms[i].len;
+ dma_map.iova = ms[i].phys_addr;
+ dma_map.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
+
+ ret = ioctl(vfio_container_fd, VFIO_IOMMU_MAP_DMA, &dma_map);
+
+ if (ret) {
+ RTE_LOG(ERR, EAL, " cannot set up DMA remapping, "
+ "error %i (%s)\n", errno, strerror(errno));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int
+vfio_noiommu_dma_map(int __rte_unused vfio_container_fd)
+{
+ /* No-IOMMU mode does not need DMA mapping */
+ return 0;
+}
+
+#endif
Code Review / deb_dpdk.git / blobdiff