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41 #include <sys/types.h>
48 #include <sys/queue.h>
50 #include <sys/ioctl.h>
51 #include <sys/pciio.h>
52 #include <dev/pci/pcireg.h>
54 #include <rte_interrupts.h>
57 #include <rte_common.h>
58 #include <rte_launch.h>
59 #include <rte_memory.h>
60 #include <rte_memzone.h>
62 #include <rte_eal_memconfig.h>
63 #include <rte_per_lcore.h>
64 #include <rte_lcore.h>
65 #include <rte_malloc.h>
66 #include <rte_string_fns.h>
67 #include <rte_debug.h>
68 #include <rte_devargs.h>
70 #include "rte_pci_dev_ids.h"
71 #include "eal_filesystem.h"
72 #include "eal_private.h"
76 * PCI probing under linux
78 * This code is used to simulate a PCI probe by parsing information in
79 * sysfs. Moreover, when a registered driver matches a device, the
80 * kernel driver currently using it is unloaded and replaced by
81 * igb_uio module, which is a very minimal userland driver for Intel
82 * network card, only providing access to PCI BAR to applications, and
83 * enabling bus master.
86 /* unbind kernel driver for this device */
88 pci_unbind_kernel_driver(struct rte_pci_device *dev __rte_unused)
90 RTE_LOG(ERR, EAL, "RTE_PCI_DRV_FORCE_UNBIND flag is not implemented "
96 pci_uio_free_resource(struct rte_pci_device *dev,
97 struct mapped_pci_resource *uio_res)
101 if (dev->intr_handle.fd) {
102 close(dev->intr_handle.fd);
103 dev->intr_handle.fd = -1;
104 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
109 pci_uio_alloc_resource(struct rte_pci_device *dev,
110 struct mapped_pci_resource **uio_res)
112 char devname[PATH_MAX]; /* contains the /dev/uioX */
113 struct rte_pci_addr *loc;
117 snprintf(devname, sizeof(devname), "/dev/uio@pci:%u:%u:%u",
118 dev->addr.bus, dev->addr.devid, dev->addr.function);
120 if (access(devname, O_RDWR) < 0) {
121 RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
122 "skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
126 /* save fd if in primary process */
127 dev->intr_handle.fd = open(devname, O_RDWR);
128 if (dev->intr_handle.fd < 0) {
129 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
130 devname, strerror(errno));
133 dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
135 /* allocate the mapping details for secondary processes*/
136 *uio_res = rte_zmalloc("UIO_RES", sizeof(**uio_res), 0);
137 if (*uio_res == NULL) {
139 "%s(): cannot store uio mmap details\n", __func__);
143 snprintf((*uio_res)->path, sizeof((*uio_res)->path), "%s", devname);
144 memcpy(&(*uio_res)->pci_addr, &dev->addr, sizeof((*uio_res)->pci_addr));
149 pci_uio_free_resource(dev, *uio_res);
154 pci_uio_map_resource_by_index(struct rte_pci_device *dev, int res_idx,
155 struct mapped_pci_resource *uio_res, int map_idx)
162 struct pci_map *maps;
164 maps = uio_res->maps;
165 devname = uio_res->path;
166 pagesz = sysconf(_SC_PAGESIZE);
168 /* allocate memory to keep path */
169 maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
170 if (maps[map_idx].path == NULL) {
171 RTE_LOG(ERR, EAL, "Cannot allocate memory for path: %s\n",
177 * open resource file, to mmap it
179 fd = open(devname, O_RDWR);
181 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
182 devname, strerror(errno));
186 /* if matching map is found, then use it */
187 offset = res_idx * pagesz;
188 mapaddr = pci_map_resource(NULL, fd, (off_t)offset,
189 (size_t)dev->mem_resource[res_idx].len, 0);
191 if (mapaddr == MAP_FAILED)
194 maps[map_idx].phaddr = dev->mem_resource[res_idx].phys_addr;
195 maps[map_idx].size = dev->mem_resource[res_idx].len;
196 maps[map_idx].addr = mapaddr;
197 maps[map_idx].offset = offset;
198 strcpy(maps[map_idx].path, devname);
199 dev->mem_resource[res_idx].addr = mapaddr;
204 rte_free(maps[map_idx].path);
209 pci_scan_one(int dev_pci_fd, struct pci_conf *conf)
211 struct rte_pci_device *dev;
212 struct pci_bar_io bar;
215 dev = malloc(sizeof(*dev));
220 memset(dev, 0, sizeof(*dev));
221 dev->addr.domain = conf->pc_sel.pc_domain;
222 dev->addr.bus = conf->pc_sel.pc_bus;
223 dev->addr.devid = conf->pc_sel.pc_dev;
224 dev->addr.function = conf->pc_sel.pc_func;
227 dev->id.vendor_id = conf->pc_vendor;
230 dev->id.device_id = conf->pc_device;
232 /* get subsystem_vendor id */
233 dev->id.subsystem_vendor_id = conf->pc_subvendor;
235 /* get subsystem_device id */
236 dev->id.subsystem_device_id = conf->pc_subdevice;
238 /* TODO: get max_vfs */
241 /* FreeBSD has no NUMA support (yet) */
244 /* FreeBSD has only one pass through driver */
245 dev->kdrv = RTE_KDRV_NIC_UIO;
247 /* parse resources */
248 switch (conf->pc_hdr & PCIM_HDRTYPE) {
249 case PCIM_HDRTYPE_NORMAL:
250 max = PCIR_MAX_BAR_0;
252 case PCIM_HDRTYPE_BRIDGE:
253 max = PCIR_MAX_BAR_1;
255 case PCIM_HDRTYPE_CARDBUS:
256 max = PCIR_MAX_BAR_2;
262 for (i = 0; i <= max; i++) {
263 bar.pbi_sel = conf->pc_sel;
264 bar.pbi_reg = PCIR_BAR(i);
265 if (ioctl(dev_pci_fd, PCIOCGETBAR, &bar) < 0)
268 dev->mem_resource[i].len = bar.pbi_length;
269 if (PCI_BAR_IO(bar.pbi_base)) {
270 dev->mem_resource[i].addr = (void *)(bar.pbi_base & ~((uint64_t)0xf));
273 dev->mem_resource[i].phys_addr = bar.pbi_base & ~((uint64_t)0xf);
276 /* device is valid, add in list (sorted) */
277 if (TAILQ_EMPTY(&pci_device_list)) {
278 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
281 struct rte_pci_device *dev2 = NULL;
284 TAILQ_FOREACH(dev2, &pci_device_list, next) {
285 ret = rte_eal_compare_pci_addr(&dev->addr, &dev2->addr);
289 TAILQ_INSERT_BEFORE(dev2, dev, next);
291 } else { /* already registered */
292 dev2->kdrv = dev->kdrv;
293 dev2->max_vfs = dev->max_vfs;
294 memmove(dev2->mem_resource,
296 sizeof(dev->mem_resource));
301 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
312 * Scan the content of the PCI bus, and add the devices in the devices
313 * list. Call pci_scan_one() for each pci entry found.
316 rte_eal_pci_scan(void)
319 unsigned dev_count = 0;
320 struct pci_conf matches[16];
321 struct pci_conf_io conf_io = {
325 .match_buf_len = sizeof(matches),
326 .matches = &matches[0],
329 fd = open("/dev/pci", O_RDONLY);
331 RTE_LOG(ERR, EAL, "%s(): error opening /dev/pci\n", __func__);
337 if (ioctl(fd, PCIOCGETCONF, &conf_io) < 0) {
338 RTE_LOG(ERR, EAL, "%s(): error with ioctl on /dev/pci: %s\n",
339 __func__, strerror(errno));
343 for (i = 0; i < conf_io.num_matches; i++)
344 if (pci_scan_one(fd, &matches[i]) < 0)
347 dev_count += conf_io.num_matches;
348 } while(conf_io.status == PCI_GETCONF_MORE_DEVS);
352 RTE_LOG(ERR, EAL, "PCI scan found %u devices\n", dev_count);
361 /* Init the PCI EAL subsystem */
363 rte_eal_pci_init(void)
365 TAILQ_INIT(&pci_driver_list);
366 TAILQ_INIT(&pci_device_list);
368 /* for debug purposes, PCI can be disabled */
369 if (internal_config.no_pci)
372 if (rte_eal_pci_scan() < 0) {
373 RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);