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40 #include <linux/pci_regs.h>
44 #include <rte_eal_memconfig.h>
45 #include <rte_common.h>
46 #include <rte_malloc.h>
48 #include "rte_pci_dev_ids.h"
49 #include "eal_filesystem.h"
50 #include "eal_pci_init.h"
52 void *pci_map_addr = NULL;
54 static struct rte_tailq_elem rte_uio_tailq = {
55 .name = "UIO_RESOURCE_LIST",
57 EAL_REGISTER_TAILQ(rte_uio_tailq)
59 #define OFF_MAX ((uint64_t)(off_t)-1)
62 pci_uio_set_bus_master(int dev_fd)
67 ret = pread(dev_fd, ®, sizeof(reg), PCI_COMMAND);
68 if (ret != sizeof(reg)) {
70 "Cannot read command from PCI config space!\n");
74 /* return if bus mastering is already on */
75 if (reg & PCI_COMMAND_MASTER)
78 reg |= PCI_COMMAND_MASTER;
80 ret = pwrite(dev_fd, ®, sizeof(reg), PCI_COMMAND);
81 if (ret != sizeof(reg)) {
83 "Cannot write command to PCI config space!\n");
91 pci_uio_map_secondary(struct rte_pci_device *dev)
94 struct mapped_pci_resource *uio_res;
95 struct mapped_pci_res_list *uio_res_list =
96 RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
98 TAILQ_FOREACH(uio_res, uio_res_list, next) {
100 /* skip this element if it doesn't match our PCI address */
101 if (rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
104 for (i = 0; i != uio_res->nb_maps; i++) {
106 * open devname, to mmap it
108 fd = open(uio_res->maps[i].path, O_RDWR);
110 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
111 uio_res->maps[i].path, strerror(errno));
115 void *mapaddr = pci_map_resource(uio_res->maps[i].addr,
116 fd, (off_t)uio_res->maps[i].offset,
117 (size_t)uio_res->maps[i].size, 0);
118 if (mapaddr != uio_res->maps[i].addr) {
119 if (mapaddr == MAP_FAILED)
121 "Cannot mmap device resource file %s: %s\n",
122 uio_res->maps[i].path,
126 "Cannot mmap device resource file %s to address: %p\n",
127 uio_res->maps[i].path,
128 uio_res->maps[i].addr);
133 /* fd is not needed in slave process, close it */
139 RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
144 pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num)
147 char filename[PATH_MAX];
149 unsigned major, minor;
152 /* get the name of the sysfs file that contains the major and minor
153 * of the uio device and read its content */
154 snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path);
156 f = fopen(filename, "r");
158 RTE_LOG(ERR, EAL, "%s(): cannot open sysfs to get major:minor\n",
163 ret = fscanf(f, "%u:%u", &major, &minor);
165 RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs to get major:minor\n",
172 /* create the char device "mknod /dev/uioX c major minor" */
173 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
174 dev = makedev(major, minor);
175 ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
177 RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n",
178 __func__, strerror(errno));
186 * Return the uioX char device used for a pci device. On success, return
187 * the UIO number and fill dstbuf string with the path of the device in
188 * sysfs. On error, return a negative value. In this case dstbuf is
192 pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
195 struct rte_pci_addr *loc = &dev->addr;
196 unsigned int uio_num;
199 char dirname[PATH_MAX];
201 /* depending on kernel version, uio can be located in uio/uioX
204 snprintf(dirname, sizeof(dirname),
205 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
206 loc->domain, loc->bus, loc->devid, loc->function);
208 dir = opendir(dirname);
210 /* retry with the parent directory */
211 snprintf(dirname, sizeof(dirname),
212 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
213 loc->domain, loc->bus, loc->devid, loc->function);
214 dir = opendir(dirname);
217 RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
222 /* take the first file starting with "uio" */
223 while ((e = readdir(dir)) != NULL) {
224 /* format could be uio%d ...*/
225 int shortprefix_len = sizeof("uio") - 1;
226 /* ... or uio:uio%d */
227 int longprefix_len = sizeof("uio:uio") - 1;
230 if (strncmp(e->d_name, "uio", 3) != 0)
233 /* first try uio%d */
235 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
236 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
237 snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num);
241 /* then try uio:uio%d */
243 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
244 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
245 snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num);
251 /* No uio resource found */
255 /* create uio device if we've been asked to */
256 if (internal_config.create_uio_dev &&
257 pci_mknod_uio_dev(dstbuf, uio_num) < 0)
258 RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num);
263 /* map the PCI resource of a PCI device in virtual memory */
265 pci_uio_map_resource(struct rte_pci_device *dev)
268 char dirname[PATH_MAX];
269 char cfgname[PATH_MAX];
270 char devname[PATH_MAX]; /* contains the /dev/uioX */
274 struct rte_pci_addr *loc = &dev->addr;
275 struct mapped_pci_resource *uio_res;
276 struct mapped_pci_res_list *uio_res_list =
277 RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
278 struct pci_map *maps;
280 dev->intr_handle.fd = -1;
281 dev->intr_handle.uio_cfg_fd = -1;
282 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
284 /* secondary processes - use already recorded details */
285 if (rte_eal_process_type() != RTE_PROC_PRIMARY)
286 return pci_uio_map_secondary(dev);
288 /* find uio resource */
289 uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname));
291 RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
292 "skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
295 snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
297 /* save fd if in primary process */
298 dev->intr_handle.fd = open(devname, O_RDWR);
299 if (dev->intr_handle.fd < 0) {
300 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
301 devname, strerror(errno));
305 snprintf(cfgname, sizeof(cfgname),
306 "/sys/class/uio/uio%u/device/config", uio_num);
307 dev->intr_handle.uio_cfg_fd = open(cfgname, O_RDWR);
308 if (dev->intr_handle.uio_cfg_fd < 0) {
309 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
310 cfgname, strerror(errno));
314 if (dev->kdrv == RTE_KDRV_IGB_UIO)
315 dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
317 dev->intr_handle.type = RTE_INTR_HANDLE_UIO_INTX;
319 /* set bus master that is not done by uio_pci_generic */
320 if (pci_uio_set_bus_master(dev->intr_handle.uio_cfg_fd)) {
321 RTE_LOG(ERR, EAL, "Cannot set up bus mastering!\n");
326 /* allocate the mapping details for secondary processes*/
327 uio_res = rte_zmalloc("UIO_RES", sizeof(*uio_res), 0);
328 if (uio_res == NULL) {
330 "%s(): cannot store uio mmap details\n", __func__);
334 snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
335 memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
338 maps = uio_res->maps;
339 for (i = 0, map_idx = 0; i != PCI_MAX_RESOURCE; i++) {
344 phaddr = dev->mem_resource[i].phys_addr;
349 /* update devname for mmap */
350 snprintf(devname, sizeof(devname),
351 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/resource%d",
352 loc->domain, loc->bus, loc->devid, loc->function,
356 * open resource file, to mmap it
358 fd = open(devname, O_RDWR);
360 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
361 devname, strerror(errno));
365 /* try mapping somewhere close to the end of hugepages */
366 if (pci_map_addr == NULL)
367 pci_map_addr = pci_find_max_end_va();
369 mapaddr = pci_map_resource(pci_map_addr, fd, 0,
370 (size_t)dev->mem_resource[i].len, 0);
371 if (mapaddr == MAP_FAILED)
374 pci_map_addr = RTE_PTR_ADD(mapaddr,
375 (size_t)dev->mem_resource[i].len);
377 maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
378 if (maps[map_idx].path == NULL)
388 maps[map_idx].phaddr = dev->mem_resource[i].phys_addr;
389 maps[map_idx].size = dev->mem_resource[i].len;
390 maps[map_idx].addr = mapaddr;
391 maps[map_idx].offset = 0;
392 strcpy(maps[map_idx].path, devname);
394 dev->mem_resource[i].addr = mapaddr;
397 uio_res->nb_maps = map_idx;
399 TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
404 #ifdef RTE_LIBRTE_EAL_HOTPLUG
406 pci_uio_unmap(struct mapped_pci_resource *uio_res)
413 for (i = 0; i != uio_res->nb_maps; i++)
414 pci_unmap_resource(uio_res->maps[i].addr,
415 (size_t)uio_res->maps[i].size);
418 static struct mapped_pci_resource *
419 pci_uio_find_resource(struct rte_pci_device *dev)
421 struct mapped_pci_resource *uio_res;
422 struct mapped_pci_res_list *uio_res_list =
423 RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
428 TAILQ_FOREACH(uio_res, uio_res_list, next) {
430 /* skip this element if it doesn't match our PCI address */
431 if (!rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
437 /* unmap the PCI resource of a PCI device in virtual memory */
439 pci_uio_unmap_resource(struct rte_pci_device *dev)
441 struct mapped_pci_resource *uio_res;
442 struct mapped_pci_res_list *uio_res_list =
443 RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
448 /* find an entry for the device */
449 uio_res = pci_uio_find_resource(dev);
453 /* secondary processes - just free maps */
454 if (rte_eal_process_type() != RTE_PROC_PRIMARY)
455 return pci_uio_unmap(uio_res);
457 TAILQ_REMOVE(uio_res_list, uio_res, next);
459 /* unmap all resources */
460 pci_uio_unmap(uio_res);
462 /* free uio resource */
465 /* close fd if in primary process */
466 close(dev->intr_handle.fd);
468 dev->intr_handle.fd = -1;
469 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
471 #endif /* RTE_LIBRTE_EAL_HOTPLUG */