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39 #include <linux/pci_regs.h>
43 #include <rte_common.h>
44 #include <rte_malloc.h>
45 #include <rte_tailq.h>
47 #include "rte_pci_dev_ids.h"
48 #include "eal_filesystem.h"
49 #include "eal_pci_init.h"
51 void *pci_map_addr = NULL;
54 #define OFF_MAX ((uint64_t)(off_t)-1)
56 pci_uio_get_mappings(struct rte_pci_device *dev,
57 struct pci_map maps[], int nb_maps)
59 struct rte_pci_addr *loc = &dev->addr;
61 char filename[PATH_MAX];
62 unsigned long long start_addr, end_addr, flags;
65 snprintf(filename, sizeof(filename),
66 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/resource",
67 loc->domain, loc->bus, loc->devid, loc->function);
69 f = fopen(filename, "r");
72 "%s(): cannot open sysfs %s\n",
77 while (fscanf(f, "%llx %llx %llx", &start_addr,
78 &end_addr, &flags) == 3 && i < nb_maps) {
79 if (flags & IORESOURCE_MEM) {
81 maps[i].size = end_addr - start_addr + 1;
82 maps[i].phaddr = start_addr;
92 pci_uio_set_bus_master(int dev_fd)
97 ret = pread(dev_fd, ®, sizeof(reg), PCI_COMMAND);
98 if (ret != sizeof(reg)) {
100 "Cannot read command from PCI config space!\n");
104 /* return if bus mastering is already on */
105 if (reg & PCI_COMMAND_MASTER)
108 reg |= PCI_COMMAND_MASTER;
110 ret = pwrite(dev_fd, ®, sizeof(reg), PCI_COMMAND);
111 if (ret != sizeof(reg)) {
113 "Cannot write command to PCI config space!\n");
121 pci_uio_map_secondary(struct rte_pci_device *dev)
124 struct mapped_pci_resource *uio_res;
126 TAILQ_FOREACH(uio_res, pci_res_list, next) {
128 /* skip this element if it doesn't match our PCI address */
129 if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
132 for (i = 0; i != uio_res->nb_maps; i++) {
133 /* ignore mappings unused in primary process */
134 if (uio_res->maps[i].addr == NULL)
138 * open devname, to mmap it
140 fd = open(uio_res->maps[i].path, O_RDWR);
142 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
143 uio_res->maps[i].path, strerror(errno));
147 if (pci_map_resource(uio_res->maps[i].addr, fd,
148 (off_t)uio_res->maps[i].offset,
149 (size_t)uio_res->maps[i].size, 0)
150 != uio_res->maps[i].addr) {
152 "Cannot mmap device resource file: %s\n",
153 uio_res->maps[i].path);
157 /* fd is not needed in slave process, close it */
163 RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
168 pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num)
171 char filename[PATH_MAX];
173 unsigned major, minor;
176 /* get the name of the sysfs file that contains the major and minor
177 * of the uio device and read its content */
178 snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path);
180 f = fopen(filename, "r");
182 RTE_LOG(ERR, EAL, "%s(): cannot open sysfs to get major:minor\n",
187 ret = fscanf(f, "%u:%u", &major, &minor);
189 RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs to get major:minor\n",
196 /* create the char device "mknod /dev/uioX c major minor" */
197 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
198 dev = makedev(major, minor);
199 ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
201 RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n",
202 __func__, strerror(errno));
210 * Return the uioX char device used for a pci device. On success, return
211 * the UIO number and fill dstbuf string with the path of the device in
212 * sysfs. On error, return a negative value. In this case dstbuf is
216 pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
219 struct rte_pci_addr *loc = &dev->addr;
220 unsigned int uio_num;
223 char dirname[PATH_MAX];
225 /* depending on kernel version, uio can be located in uio/uioX
228 snprintf(dirname, sizeof(dirname),
229 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
230 loc->domain, loc->bus, loc->devid, loc->function);
232 dir = opendir(dirname);
234 /* retry with the parent directory */
235 snprintf(dirname, sizeof(dirname),
236 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
237 loc->domain, loc->bus, loc->devid, loc->function);
238 dir = opendir(dirname);
241 RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
246 /* take the first file starting with "uio" */
247 while ((e = readdir(dir)) != NULL) {
248 /* format could be uio%d ...*/
249 int shortprefix_len = sizeof("uio") - 1;
250 /* ... or uio:uio%d */
251 int longprefix_len = sizeof("uio:uio") - 1;
254 if (strncmp(e->d_name, "uio", 3) != 0)
257 /* first try uio%d */
259 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
260 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
261 snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num);
265 /* then try uio:uio%d */
267 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
268 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
269 snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num);
275 /* No uio resource found */
279 /* create uio device if we've been asked to */
280 if (internal_config.create_uio_dev &&
281 pci_mknod_uio_dev(dstbuf, uio_num) < 0)
282 RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num);
287 /* map the PCI resource of a PCI device in virtual memory */
289 pci_uio_map_resource(struct rte_pci_device *dev)
292 char dirname[PATH_MAX];
293 char cfgname[PATH_MAX];
294 char devname[PATH_MAX]; /* contains the /dev/uioX */
299 struct rte_pci_addr *loc = &dev->addr;
300 struct mapped_pci_resource *uio_res;
301 struct pci_map *maps;
303 dev->intr_handle.fd = -1;
304 dev->intr_handle.uio_cfg_fd = -1;
305 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
307 /* secondary processes - use already recorded details */
308 if (rte_eal_process_type() != RTE_PROC_PRIMARY)
309 return pci_uio_map_secondary(dev);
311 /* find uio resource */
312 uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname));
314 RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
315 "skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
318 snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
320 /* save fd if in primary process */
321 dev->intr_handle.fd = open(devname, O_RDWR);
322 if (dev->intr_handle.fd < 0) {
323 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
324 devname, strerror(errno));
327 dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
329 snprintf(cfgname, sizeof(cfgname),
330 "/sys/class/uio/uio%u/device/config", uio_num);
331 dev->intr_handle.uio_cfg_fd = open(cfgname, O_RDWR);
332 if (dev->intr_handle.uio_cfg_fd < 0) {
333 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
334 cfgname, strerror(errno));
338 /* set bus master that is not done by uio_pci_generic */
339 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
340 if (pci_uio_set_bus_master(dev->intr_handle.uio_cfg_fd)) {
341 RTE_LOG(ERR, EAL, "Cannot set up bus mastering!\n");
346 /* allocate the mapping details for secondary processes*/
347 uio_res = rte_zmalloc("UIO_RES", sizeof(*uio_res), 0);
348 if (uio_res == NULL) {
350 "%s(): cannot store uio mmap details\n", __func__);
354 snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
355 memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
357 /* collect info about device mappings */
358 nb_maps = pci_uio_get_mappings(dev, uio_res->maps,
359 RTE_DIM(uio_res->maps));
364 uio_res->nb_maps = nb_maps;
367 maps = uio_res->maps;
368 for (i = 0; i != PCI_MAX_RESOURCE; i++) {
372 phaddr = dev->mem_resource[i].phys_addr;
376 for (j = 0; j != nb_maps && (phaddr != maps[j].phaddr ||
377 dev->mem_resource[i].len != maps[j].size);
381 /* if matching map is found, then use it */
385 /* update devname for mmap */
386 snprintf(devname, sizeof(devname),
387 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/resource%d",
388 loc->domain, loc->bus, loc->devid, loc->function,
392 * open resource file, to mmap it
394 fd = open(devname, O_RDWR);
396 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
397 devname, strerror(errno));
401 if (maps[j].addr != NULL)
404 /* try mapping somewhere close to the end of hugepages */
405 if (pci_map_addr == NULL)
406 pci_map_addr = pci_find_max_end_va();
408 mapaddr = pci_map_resource(pci_map_addr, fd, 0,
409 (size_t)maps[j].size, 0);
410 if (mapaddr == MAP_FAILED)
413 pci_map_addr = RTE_PTR_ADD(mapaddr, (size_t) maps[j].size);
416 maps[j].path = rte_malloc(NULL, strlen(devname) + 1, 0);
417 if (maps[j].path == NULL)
427 maps[j].addr = mapaddr;
429 strcpy(maps[j].path, devname);
430 dev->mem_resource[i].addr = mapaddr;
434 TAILQ_INSERT_TAIL(pci_res_list, uio_res, next);