/*- * 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 #include #include #include #include #include #include #include #include "eal_filesystem.h" #include "eal_private.h" #include "eal_pci_init.h" /** * @file * PCI probing under linux * * This code is used to simulate a PCI probe by parsing information in sysfs. * When a registered device matches a driver, it is then initialized with * IGB_UIO driver (or doesn't initialize, if the device wasn't bound to it). */ /* unbind kernel driver for this device */ int pci_unbind_kernel_driver(struct rte_pci_device *dev) { int n; FILE *f; char filename[PATH_MAX]; char buf[BUFSIZ]; struct rte_pci_addr *loc = &dev->addr; /* open /sys/bus/pci/devices/AAAA:BB:CC.D/driver */ snprintf(filename, sizeof(filename), SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/driver/unbind", loc->domain, loc->bus, loc->devid, loc->function); f = fopen(filename, "w"); if (f == NULL) /* device was not bound */ return 0; n = snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n", loc->domain, loc->bus, loc->devid, loc->function); if ((n < 0) || (n >= (int)sizeof(buf))) { RTE_LOG(ERR, EAL, "%s(): snprintf failed\n", __func__); goto error; } if (fwrite(buf, n, 1, f) == 0) { RTE_LOG(ERR, EAL, "%s(): could not write to %s\n", __func__, filename); goto error; } fclose(f); return 0; error: fclose(f); return -1; } static int pci_get_kernel_driver_by_path(const char *filename, char *dri_name) { int count; char path[PATH_MAX]; char *name; if (!filename || !dri_name) return -1; count = readlink(filename, path, PATH_MAX); if (count >= PATH_MAX) return -1; /* For device does not have a driver */ if (count < 0) return 1; path[count] = '\0'; name = strrchr(path, '/'); if (name) { strncpy(dri_name, name + 1, strlen(name + 1) + 1); return 0; } return -1; } /* Map pci device */ int pci_map_device(struct rte_pci_device *dev) { int ret = -1; /* try mapping the NIC resources using VFIO if it exists */ switch (dev->kdrv) { case RTE_KDRV_VFIO: #ifdef VFIO_PRESENT if (pci_vfio_is_enabled()) ret = pci_vfio_map_resource(dev); #endif break; case RTE_KDRV_IGB_UIO: case RTE_KDRV_UIO_GENERIC: /* map resources for devices that use uio */ ret = pci_uio_map_resource(dev); break; default: RTE_LOG(DEBUG, EAL, " Not managed by a supported kernel driver, skipped\n"); ret = 1; break; } return ret; } /* Unmap pci device */ void pci_unmap_device(struct rte_pci_device *dev) { /* try unmapping the NIC resources using VFIO if it exists */ switch (dev->kdrv) { case RTE_KDRV_VFIO: RTE_LOG(ERR, EAL, "Hotplug doesn't support vfio yet\n"); break; case RTE_KDRV_IGB_UIO: case RTE_KDRV_UIO_GENERIC: /* unmap resources for devices that use uio */ pci_uio_unmap_resource(dev); break; default: RTE_LOG(DEBUG, EAL, " Not managed by a supported kernel driver, skipped\n"); break; } } void * pci_find_max_end_va(void) { const struct rte_memseg *seg = rte_eal_get_physmem_layout(); const struct rte_memseg *last = seg; unsigned i = 0; for (i = 0; i < RTE_MAX_MEMSEG; i++, seg++) { if (seg->addr == NULL) break; if (seg->addr > last->addr) last = seg; } return RTE_PTR_ADD(last->addr, last->len); } /* parse the "resource" sysfs file */ static int pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev) { FILE *f; char buf[BUFSIZ]; union pci_resource_info { struct { char *phys_addr; char *end_addr; char *flags; }; char *ptrs[PCI_RESOURCE_FMT_NVAL]; } res_info; int i; uint64_t phys_addr, end_addr, flags; f = fopen(filename, "r"); if (f == NULL) { RTE_LOG(ERR, EAL, "Cannot open sysfs resource\n"); return -1; } for (i = 0; imem_resource[i].phys_addr = phys_addr; dev->mem_resource[i].len = end_addr - phys_addr + 1; /* not mapped for now */ dev->mem_resource[i].addr = NULL; } } fclose(f); return 0; error: fclose(f); return -1; } /* Scan one pci sysfs entry, and fill the devices list from it. */ static int pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus, uint8_t devid, uint8_t function) { char filename[PATH_MAX]; unsigned long tmp; struct rte_pci_device *dev; char driver[PATH_MAX]; int ret; dev = malloc(sizeof(*dev)); if (dev == NULL) return -1; memset(dev, 0, sizeof(*dev)); dev->addr.domain = domain; dev->addr.bus = bus; dev->addr.devid = devid; dev->addr.function = function; /* get vendor id */ snprintf(filename, sizeof(filename), "%s/vendor", dirname); if (eal_parse_sysfs_value(filename, &tmp) < 0) { free(dev); return -1; } dev->id.vendor_id = (uint16_t)tmp; /* get device id */ snprintf(filename, sizeof(filename), "%s/device", dirname); if (eal_parse_sysfs_value(filename, &tmp) < 0) { free(dev); return -1; } dev->id.device_id = (uint16_t)tmp; /* get subsystem_vendor id */ snprintf(filename, sizeof(filename), "%s/subsystem_vendor", dirname); if (eal_parse_sysfs_value(filename, &tmp) < 0) { free(dev); return -1; } dev->id.subsystem_vendor_id = (uint16_t)tmp; /* get subsystem_device id */ snprintf(filename, sizeof(filename), "%s/subsystem_device", dirname); if (eal_parse_sysfs_value(filename, &tmp) < 0) { free(dev); return -1; } dev->id.subsystem_device_id = (uint16_t)tmp; /* get max_vfs */ dev->max_vfs = 0; snprintf(filename, sizeof(filename), "%s/max_vfs", dirname); if (!access(filename, F_OK) && eal_parse_sysfs_value(filename, &tmp) == 0) dev->max_vfs = (uint16_t)tmp; else { /* for non igb_uio driver, need kernel version >= 3.8 */ snprintf(filename, sizeof(filename), "%s/sriov_numvfs", dirname); if (!access(filename, F_OK) && eal_parse_sysfs_value(filename, &tmp) == 0) dev->max_vfs = (uint16_t)tmp; } /* get numa node */ snprintf(filename, sizeof(filename), "%s/numa_node", dirname); if (access(filename, R_OK) != 0) { /* if no NUMA support, set default to 0 */ dev->numa_node = 0; } else { if (eal_parse_sysfs_value(filename, &tmp) < 0) { free(dev); return -1; } dev->numa_node = tmp; } /* parse resources */ snprintf(filename, sizeof(filename), "%s/resource", dirname); if (pci_parse_sysfs_resource(filename, dev) < 0) { RTE_LOG(ERR, EAL, "%s(): cannot parse resource\n", __func__); free(dev); return -1; } /* parse driver */ snprintf(filename, sizeof(filename), "%s/driver", dirname); ret = pci_get_kernel_driver_by_path(filename, driver); if (ret < 0) { RTE_LOG(ERR, EAL, "Fail to get kernel driver\n"); free(dev); return -1; } if (!ret) { if (!strcmp(driver, "vfio-pci")) dev->kdrv = RTE_KDRV_VFIO; else if (!strcmp(driver, "igb_uio")) dev->kdrv = RTE_KDRV_IGB_UIO; else if (!strcmp(driver, "uio_pci_generic")) dev->kdrv = RTE_KDRV_UIO_GENERIC; else dev->kdrv = RTE_KDRV_UNKNOWN; } else dev->kdrv = RTE_KDRV_UNKNOWN; /* device is valid, add in list (sorted) */ if (TAILQ_EMPTY(&pci_device_list)) { TAILQ_INSERT_TAIL(&pci_device_list, dev, next); } else { struct rte_pci_device *dev2; int ret; TAILQ_FOREACH(dev2, &pci_device_list, next) { ret = rte_eal_compare_pci_addr(&dev->addr, &dev2->addr); if (ret > 0) continue; if (ret < 0) { TAILQ_INSERT_BEFORE(dev2, dev, next); } else { /* already registered */ dev2->kdrv = dev->kdrv; dev2->max_vfs = dev->max_vfs; memmove(dev2->mem_resource, dev->mem_resource, sizeof(dev->mem_resource)); free(dev); } return 0; } TAILQ_INSERT_TAIL(&pci_device_list, dev, next); } return 0; } /* * split up a pci address into its constituent parts. */ static int parse_pci_addr_format(const char *buf, int bufsize, uint16_t *domain, uint8_t *bus, uint8_t *devid, uint8_t *function) { /* first split on ':' */ union splitaddr { struct { char *domain; char *bus; char *devid; char *function; }; char *str[PCI_FMT_NVAL]; /* last element-separator is "." not ":" */ } splitaddr; char *buf_copy = strndup(buf, bufsize); if (buf_copy == NULL) return -1; if (rte_strsplit(buf_copy, bufsize, splitaddr.str, PCI_FMT_NVAL, ':') != PCI_FMT_NVAL - 1) goto error; /* final split is on '.' between devid and function */ splitaddr.function = strchr(splitaddr.devid,'.'); if (splitaddr.function == NULL) goto error; *splitaddr.function++ = '\0'; /* now convert to int values */ errno = 0; *domain = (uint16_t)strtoul(splitaddr.domain, NULL, 16); *bus = (uint8_t)strtoul(splitaddr.bus, NULL, 16); *devid = (uint8_t)strtoul(splitaddr.devid, NULL, 16); *function = (uint8_t)strtoul(splitaddr.function, NULL, 10); if (errno != 0) goto error; free(buf_copy); /* free the copy made with strdup */ return 0; error: free(buf_copy); return -1; } /* * Scan the content of the PCI bus, and the devices in the devices * list */ int rte_eal_pci_scan(void) { struct dirent *e; DIR *dir; char dirname[PATH_MAX]; uint16_t domain; uint8_t bus, devid, function; dir = opendir(SYSFS_PCI_DEVICES); if (dir == NULL) { RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n", __func__, strerror(errno)); return -1; } while ((e = readdir(dir)) != NULL) { if (e->d_name[0] == '.') continue; if (parse_pci_addr_format(e->d_name, sizeof(e->d_name), &domain, &bus, &devid, &function) != 0) continue; snprintf(dirname, sizeof(dirname), "%s/%s", SYSFS_PCI_DEVICES, e->d_name); if (pci_scan_one(dirname, domain, bus, devid, function) < 0) goto error; } closedir(dir); return 0; error: closedir(dir); return -1; } #ifdef RTE_PCI_CONFIG static int pci_config_extended_tag(struct rte_pci_device *dev) { struct rte_pci_addr *loc = &dev->addr; char filename[PATH_MAX]; char buf[BUFSIZ]; FILE *f; /* not configured, let it as is */ if (strncmp(RTE_PCI_EXTENDED_TAG, "on", 2) != 0 && strncmp(RTE_PCI_EXTENDED_TAG, "off", 3) != 0) return 0; snprintf(filename, sizeof(filename), SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/" "extended_tag", loc->domain, loc->bus, loc->devid, loc->function); f = fopen(filename, "rw+"); if (!f) return -1; fgets(buf, sizeof(buf), f); if (strncmp(RTE_PCI_EXTENDED_TAG, "on", 2) == 0) { /* enable Extended Tag*/ if (strncmp(buf, "on", 2) != 0) { fseek(f, 0, SEEK_SET); fputs("on", f); } } else { /* disable Extended Tag */ if (strncmp(buf, "off", 3) != 0) { fseek(f, 0, SEEK_SET); fputs("off", f); } } fclose(f); return 0; } static int pci_config_max_read_request_size(struct rte_pci_device *dev) { struct rte_pci_addr *loc = &dev->addr; char filename[PATH_MAX]; char buf[BUFSIZ], param[BUFSIZ]; FILE *f; /* size can be 128, 256, 512, 1024, 2048, 4096 */ uint32_t max_size = RTE_PCI_MAX_READ_REQUEST_SIZE; /* not configured, let it as is */ if (!max_size) return 0; snprintf(filename, sizeof(filename), SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/" "max_read_request_size", loc->domain, loc->bus, loc->devid, loc->function); f = fopen(filename, "rw+"); if (!f) return -1; fgets(buf, sizeof(buf), f); snprintf(param, sizeof(param), "%d", max_size); /* check if the size to be set is the same as current */ if (strcmp(buf, param) == 0) { fclose(f); return 0; } fseek(f, 0, SEEK_SET); fputs(param, f); fclose(f); return 0; } void pci_config_space_set(struct rte_pci_device *dev) { if (rte_eal_process_type() != RTE_PROC_PRIMARY) return; /* configure extended tag */ pci_config_extended_tag(dev); /* configure max read request size */ pci_config_max_read_request_size(dev); } #endif /* Read PCI config space. */ int rte_eal_pci_read_config(const struct rte_pci_device *device, void *buf, size_t len, off_t offset) { const struct rte_intr_handle *intr_handle = &device->intr_handle; switch (intr_handle->type) { case RTE_INTR_HANDLE_UIO: case RTE_INTR_HANDLE_UIO_INTX: return pci_uio_read_config(intr_handle, buf, len, offset); #ifdef VFIO_PRESENT case RTE_INTR_HANDLE_VFIO_MSIX: case RTE_INTR_HANDLE_VFIO_MSI: case RTE_INTR_HANDLE_VFIO_LEGACY: return pci_vfio_read_config(intr_handle, buf, len, offset); #endif default: RTE_LOG(ERR, EAL, "Unknown handle type of fd %d\n", intr_handle->fd); return -1; } } /* Write PCI config space. */ int rte_eal_pci_write_config(const struct rte_pci_device *device, const void *buf, size_t len, off_t offset) { const struct rte_intr_handle *intr_handle = &device->intr_handle; switch (intr_handle->type) { case RTE_INTR_HANDLE_UIO: case RTE_INTR_HANDLE_UIO_INTX: return pci_uio_write_config(intr_handle, buf, len, offset); #ifdef VFIO_PRESENT case RTE_INTR_HANDLE_VFIO_MSIX: case RTE_INTR_HANDLE_VFIO_MSI: case RTE_INTR_HANDLE_VFIO_LEGACY: return pci_vfio_write_config(intr_handle, buf, len, offset); #endif default: RTE_LOG(ERR, EAL, "Unknown handle type of fd %d\n", intr_handle->fd); return -1; } } /* Init the PCI EAL subsystem */ int rte_eal_pci_init(void) { TAILQ_INIT(&pci_driver_list); TAILQ_INIT(&pci_device_list); /* for debug purposes, PCI can be disabled */ if (internal_config.no_pci) return 0; if (rte_eal_pci_scan() < 0) { RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__); return -1; } #ifdef VFIO_PRESENT pci_vfio_enable(); if (pci_vfio_is_enabled()) { /* if we are primary process, create a thread to communicate with * secondary processes. the thread will use a socket to wait for * requests from secondary process to send open file descriptors, * because VFIO does not allow multiple open descriptors on a group or * VFIO container. */ if (internal_config.process_type == RTE_PROC_PRIMARY && pci_vfio_mp_sync_setup() < 0) return -1; } #endif return 0; }