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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 "
97 pci_map_device(struct rte_pci_device *dev)
101 /* try mapping the NIC resources */
103 case RTE_KDRV_NIC_UIO:
104 /* map resources for devices that use uio */
105 ret = pci_uio_map_resource(dev);
109 " Not managed by a supported kernel driver, skipped\n");
117 /* Unmap pci device */
119 pci_unmap_device(struct rte_pci_device *dev)
121 /* try unmapping the NIC resources */
123 case RTE_KDRV_NIC_UIO:
124 /* unmap resources for devices that use uio */
125 pci_uio_unmap_resource(dev);
129 " Not managed by a supported kernel driver, skipped\n");
135 pci_uio_free_resource(struct rte_pci_device *dev,
136 struct mapped_pci_resource *uio_res)
140 if (dev->intr_handle.fd) {
141 close(dev->intr_handle.fd);
142 dev->intr_handle.fd = -1;
143 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
148 pci_uio_alloc_resource(struct rte_pci_device *dev,
149 struct mapped_pci_resource **uio_res)
151 char devname[PATH_MAX]; /* contains the /dev/uioX */
152 struct rte_pci_addr *loc;
156 snprintf(devname, sizeof(devname), "/dev/uio@pci:%u:%u:%u",
157 dev->addr.bus, dev->addr.devid, dev->addr.function);
159 if (access(devname, O_RDWR) < 0) {
160 RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
161 "skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
165 /* save fd if in primary process */
166 dev->intr_handle.fd = open(devname, O_RDWR);
167 if (dev->intr_handle.fd < 0) {
168 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
169 devname, strerror(errno));
172 dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
174 /* allocate the mapping details for secondary processes*/
175 *uio_res = rte_zmalloc("UIO_RES", sizeof(**uio_res), 0);
176 if (*uio_res == NULL) {
178 "%s(): cannot store uio mmap details\n", __func__);
182 snprintf((*uio_res)->path, sizeof((*uio_res)->path), "%s", devname);
183 memcpy(&(*uio_res)->pci_addr, &dev->addr, sizeof((*uio_res)->pci_addr));
188 pci_uio_free_resource(dev, *uio_res);
193 pci_uio_map_resource_by_index(struct rte_pci_device *dev, int res_idx,
194 struct mapped_pci_resource *uio_res, int map_idx)
201 struct pci_map *maps;
203 maps = uio_res->maps;
204 devname = uio_res->path;
205 pagesz = sysconf(_SC_PAGESIZE);
207 /* allocate memory to keep path */
208 maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
209 if (maps[map_idx].path == NULL) {
210 RTE_LOG(ERR, EAL, "Cannot allocate memory for path: %s\n",
216 * open resource file, to mmap it
218 fd = open(devname, O_RDWR);
220 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
221 devname, strerror(errno));
225 /* if matching map is found, then use it */
226 offset = res_idx * pagesz;
227 mapaddr = pci_map_resource(NULL, fd, (off_t)offset,
228 (size_t)dev->mem_resource[res_idx].len, 0);
230 if (mapaddr == MAP_FAILED)
233 maps[map_idx].phaddr = dev->mem_resource[res_idx].phys_addr;
234 maps[map_idx].size = dev->mem_resource[res_idx].len;
235 maps[map_idx].addr = mapaddr;
236 maps[map_idx].offset = offset;
237 strcpy(maps[map_idx].path, devname);
238 dev->mem_resource[res_idx].addr = mapaddr;
243 rte_free(maps[map_idx].path);
248 pci_scan_one(int dev_pci_fd, struct pci_conf *conf)
250 struct rte_pci_device *dev;
251 struct pci_bar_io bar;
254 dev = malloc(sizeof(*dev));
259 memset(dev, 0, sizeof(*dev));
260 dev->addr.domain = conf->pc_sel.pc_domain;
261 dev->addr.bus = conf->pc_sel.pc_bus;
262 dev->addr.devid = conf->pc_sel.pc_dev;
263 dev->addr.function = conf->pc_sel.pc_func;
266 dev->id.vendor_id = conf->pc_vendor;
269 dev->id.device_id = conf->pc_device;
271 /* get subsystem_vendor id */
272 dev->id.subsystem_vendor_id = conf->pc_subvendor;
274 /* get subsystem_device id */
275 dev->id.subsystem_device_id = conf->pc_subdevice;
277 /* TODO: get max_vfs */
280 /* FreeBSD has no NUMA support (yet) */
283 /* FreeBSD has only one pass through driver */
284 dev->kdrv = RTE_KDRV_NIC_UIO;
286 /* parse resources */
287 switch (conf->pc_hdr & PCIM_HDRTYPE) {
288 case PCIM_HDRTYPE_NORMAL:
289 max = PCIR_MAX_BAR_0;
291 case PCIM_HDRTYPE_BRIDGE:
292 max = PCIR_MAX_BAR_1;
294 case PCIM_HDRTYPE_CARDBUS:
295 max = PCIR_MAX_BAR_2;
301 for (i = 0; i <= max; i++) {
302 bar.pbi_sel = conf->pc_sel;
303 bar.pbi_reg = PCIR_BAR(i);
304 if (ioctl(dev_pci_fd, PCIOCGETBAR, &bar) < 0)
307 dev->mem_resource[i].len = bar.pbi_length;
308 if (PCI_BAR_IO(bar.pbi_base)) {
309 dev->mem_resource[i].addr = (void *)(bar.pbi_base & ~((uint64_t)0xf));
312 dev->mem_resource[i].phys_addr = bar.pbi_base & ~((uint64_t)0xf);
315 /* device is valid, add in list (sorted) */
316 if (TAILQ_EMPTY(&pci_device_list)) {
317 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
320 struct rte_pci_device *dev2 = NULL;
323 TAILQ_FOREACH(dev2, &pci_device_list, next) {
324 ret = rte_eal_compare_pci_addr(&dev->addr, &dev2->addr);
328 TAILQ_INSERT_BEFORE(dev2, dev, next);
330 } else { /* already registered */
331 dev2->kdrv = dev->kdrv;
332 dev2->max_vfs = dev->max_vfs;
333 memmove(dev2->mem_resource,
335 sizeof(dev->mem_resource));
340 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
351 * Scan the content of the PCI bus, and add the devices in the devices
352 * list. Call pci_scan_one() for each pci entry found.
355 rte_eal_pci_scan(void)
358 unsigned dev_count = 0;
359 struct pci_conf matches[16];
360 struct pci_conf_io conf_io = {
364 .match_buf_len = sizeof(matches),
365 .matches = &matches[0],
368 fd = open("/dev/pci", O_RDONLY);
370 RTE_LOG(ERR, EAL, "%s(): error opening /dev/pci\n", __func__);
376 if (ioctl(fd, PCIOCGETCONF, &conf_io) < 0) {
377 RTE_LOG(ERR, EAL, "%s(): error with ioctl on /dev/pci: %s\n",
378 __func__, strerror(errno));
382 for (i = 0; i < conf_io.num_matches; i++)
383 if (pci_scan_one(fd, &matches[i]) < 0)
386 dev_count += conf_io.num_matches;
387 } while(conf_io.status == PCI_GETCONF_MORE_DEVS);
391 RTE_LOG(ERR, EAL, "PCI scan found %u devices\n", dev_count);
400 /* Init the PCI EAL subsystem */
402 rte_eal_pci_init(void)
404 TAILQ_INIT(&pci_driver_list);
405 TAILQ_INIT(&pci_device_list);
407 /* for debug purposes, PCI can be disabled */
408 if (internal_config.no_pci)
411 if (rte_eal_pci_scan() < 0) {
412 RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);