1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
12 #include <sys/sysmacros.h>
13 #include <linux/pci_regs.h>
15 #if defined(RTE_ARCH_X86)
19 #include <rte_string_fns.h>
22 #include <rte_bus_pci.h>
23 #include <rte_common.h>
24 #include <rte_malloc.h>
26 #include "eal_filesystem.h"
30 void *pci_map_addr = NULL;
32 #define OFF_MAX ((uint64_t)(off_t)-1)
35 pci_uio_read_config(const struct rte_intr_handle *intr_handle,
36 void *buf, size_t len, off_t offset)
38 return pread(intr_handle->uio_cfg_fd, buf, len, offset);
42 pci_uio_write_config(const struct rte_intr_handle *intr_handle,
43 const void *buf, size_t len, off_t offset)
45 return pwrite(intr_handle->uio_cfg_fd, buf, len, offset);
49 pci_uio_set_bus_master(int dev_fd)
54 ret = pread(dev_fd, ®, sizeof(reg), PCI_COMMAND);
55 if (ret != sizeof(reg)) {
57 "Cannot read command from PCI config space!\n");
61 /* return if bus mastering is already on */
62 if (reg & PCI_COMMAND_MASTER)
65 reg |= PCI_COMMAND_MASTER;
67 ret = pwrite(dev_fd, ®, sizeof(reg), PCI_COMMAND);
68 if (ret != sizeof(reg)) {
70 "Cannot write command to PCI config space!\n");
78 pci_mknod_uio_dev(const char *sysfs_uio_path, unsigned uio_num)
81 char filename[PATH_MAX];
83 unsigned major, minor;
86 /* get the name of the sysfs file that contains the major and minor
87 * of the uio device and read its content */
88 snprintf(filename, sizeof(filename), "%s/dev", sysfs_uio_path);
90 f = fopen(filename, "r");
92 RTE_LOG(ERR, EAL, "%s(): cannot open sysfs to get major:minor\n",
97 ret = fscanf(f, "%u:%u", &major, &minor);
99 RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs to get major:minor\n",
106 /* create the char device "mknod /dev/uioX c major minor" */
107 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
108 dev = makedev(major, minor);
109 ret = mknod(filename, S_IFCHR | S_IRUSR | S_IWUSR, dev);
111 RTE_LOG(ERR, EAL, "%s(): mknod() failed %s\n",
112 __func__, strerror(errno));
120 * Return the uioX char device used for a pci device. On success, return
121 * the UIO number and fill dstbuf string with the path of the device in
122 * sysfs. On error, return a negative value. In this case dstbuf is
126 pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
127 unsigned int buflen, int create)
129 struct rte_pci_addr *loc = &dev->addr;
133 char dirname[PATH_MAX];
135 /* depending on kernel version, uio can be located in uio/uioX
138 snprintf(dirname, sizeof(dirname),
139 "%s/" PCI_PRI_FMT "/uio", rte_pci_get_sysfs_path(),
140 loc->domain, loc->bus, loc->devid, loc->function);
142 dir = opendir(dirname);
144 /* retry with the parent directory */
145 snprintf(dirname, sizeof(dirname),
146 "%s/" PCI_PRI_FMT, rte_pci_get_sysfs_path(),
147 loc->domain, loc->bus, loc->devid, loc->function);
148 dir = opendir(dirname);
151 RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
156 /* take the first file starting with "uio" */
157 while ((e = readdir(dir)) != NULL) {
158 /* format could be uio%d ...*/
159 int shortprefix_len = sizeof("uio") - 1;
160 /* ... or uio:uio%d */
161 int longprefix_len = sizeof("uio:uio") - 1;
164 if (strncmp(e->d_name, "uio", 3) != 0)
167 /* first try uio%d */
169 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
170 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
171 snprintf(dstbuf, buflen, "%s/uio%u", dirname, uio_num);
175 /* then try uio:uio%d */
177 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
178 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
179 snprintf(dstbuf, buflen, "%s/uio:uio%u", dirname, uio_num);
185 /* No uio resource found */
189 /* create uio device if we've been asked to */
190 if (rte_eal_create_uio_dev() && create &&
191 pci_mknod_uio_dev(dstbuf, uio_num) < 0)
192 RTE_LOG(WARNING, EAL, "Cannot create /dev/uio%u\n", uio_num);
198 pci_uio_free_resource(struct rte_pci_device *dev,
199 struct mapped_pci_resource *uio_res)
203 if (dev->intr_handle.uio_cfg_fd >= 0) {
204 close(dev->intr_handle.uio_cfg_fd);
205 dev->intr_handle.uio_cfg_fd = -1;
207 if (dev->intr_handle.fd >= 0) {
208 close(dev->intr_handle.fd);
209 dev->intr_handle.fd = -1;
210 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
215 pci_uio_alloc_resource(struct rte_pci_device *dev,
216 struct mapped_pci_resource **uio_res)
218 char dirname[PATH_MAX];
219 char cfgname[PATH_MAX];
220 char devname[PATH_MAX]; /* contains the /dev/uioX */
222 struct rte_pci_addr *loc;
226 /* find uio resource */
227 uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname), 1);
229 RTE_LOG(WARNING, EAL, " "PCI_PRI_FMT" not managed by UIO driver, "
230 "skipping\n", loc->domain, loc->bus, loc->devid, loc->function);
233 snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
235 /* save fd if in primary process */
236 dev->intr_handle.fd = open(devname, O_RDWR);
237 if (dev->intr_handle.fd < 0) {
238 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
239 devname, strerror(errno));
243 snprintf(cfgname, sizeof(cfgname),
244 "/sys/class/uio/uio%u/device/config", uio_num);
245 dev->intr_handle.uio_cfg_fd = open(cfgname, O_RDWR);
246 if (dev->intr_handle.uio_cfg_fd < 0) {
247 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
248 cfgname, strerror(errno));
252 if (dev->kdrv == RTE_PCI_KDRV_IGB_UIO)
253 dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
255 dev->intr_handle.type = RTE_INTR_HANDLE_UIO_INTX;
257 /* set bus master that is not done by uio_pci_generic */
258 if (pci_uio_set_bus_master(dev->intr_handle.uio_cfg_fd)) {
259 RTE_LOG(ERR, EAL, "Cannot set up bus mastering!\n");
264 /* allocate the mapping details for secondary processes*/
265 *uio_res = rte_zmalloc("UIO_RES", sizeof(**uio_res), 0);
266 if (*uio_res == NULL) {
268 "%s(): cannot store uio mmap details\n", __func__);
272 strlcpy((*uio_res)->path, devname, sizeof((*uio_res)->path));
273 memcpy(&(*uio_res)->pci_addr, &dev->addr, sizeof((*uio_res)->pci_addr));
278 pci_uio_free_resource(dev, *uio_res);
283 pci_uio_map_resource_by_index(struct rte_pci_device *dev, int res_idx,
284 struct mapped_pci_resource *uio_res, int map_idx)
287 char devname[PATH_MAX];
289 struct rte_pci_addr *loc;
290 struct pci_map *maps;
293 if (dev->driver != NULL)
294 wc_activate = dev->driver->drv_flags & RTE_PCI_DRV_WC_ACTIVATE;
297 maps = uio_res->maps;
299 /* allocate memory to keep path */
300 maps[map_idx].path = rte_malloc(NULL, sizeof(devname), 0);
301 if (maps[map_idx].path == NULL) {
302 RTE_LOG(ERR, EAL, "Cannot allocate memory for path: %s\n",
308 * open resource file, to mmap it
311 /* update devname for mmap */
312 snprintf(devname, sizeof(devname),
313 "%s/" PCI_PRI_FMT "/resource%d_wc",
314 rte_pci_get_sysfs_path(),
315 loc->domain, loc->bus, loc->devid,
316 loc->function, res_idx);
318 fd = open(devname, O_RDWR);
319 if (fd < 0 && errno != ENOENT) {
320 RTE_LOG(INFO, EAL, "%s cannot be mapped. "
321 "Fall-back to non prefetchable mode.\n",
326 if (!wc_activate || fd < 0) {
327 snprintf(devname, sizeof(devname),
328 "%s/" PCI_PRI_FMT "/resource%d",
329 rte_pci_get_sysfs_path(),
330 loc->domain, loc->bus, loc->devid,
331 loc->function, res_idx);
333 /* then try to map resource file */
334 fd = open(devname, O_RDWR);
336 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
337 devname, strerror(errno));
342 /* try mapping somewhere close to the end of hugepages */
343 if (pci_map_addr == NULL)
344 pci_map_addr = pci_find_max_end_va();
346 mapaddr = pci_map_resource(pci_map_addr, fd, 0,
347 (size_t)dev->mem_resource[res_idx].len, 0);
352 pci_map_addr = RTE_PTR_ADD(mapaddr,
353 (size_t)dev->mem_resource[res_idx].len);
355 pci_map_addr = RTE_PTR_ALIGN(pci_map_addr, sysconf(_SC_PAGE_SIZE));
357 maps[map_idx].phaddr = dev->mem_resource[res_idx].phys_addr;
358 maps[map_idx].size = dev->mem_resource[res_idx].len;
359 maps[map_idx].addr = mapaddr;
360 maps[map_idx].offset = 0;
361 strcpy(maps[map_idx].path, devname);
362 dev->mem_resource[res_idx].addr = mapaddr;
367 rte_free(maps[map_idx].path);
371 #if defined(RTE_ARCH_X86)
373 pci_uio_ioport_map(struct rte_pci_device *dev, int bar,
374 struct rte_pci_ioport *p)
377 char dirname[PATH_MAX];
378 char filename[PATH_MAX];
380 uint64_t phys_addr, end_addr, flags;
384 if (rte_eal_iopl_init() != 0) {
385 RTE_LOG(ERR, EAL, "%s(): insufficient ioport permissions for PCI device %s\n",
386 __func__, dev->name);
390 /* open and read addresses of the corresponding resource in sysfs */
391 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource",
392 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus,
393 dev->addr.devid, dev->addr.function);
394 f = fopen(filename, "r");
396 RTE_LOG(ERR, EAL, "%s(): Cannot open sysfs resource: %s\n",
397 __func__, strerror(errno));
401 for (i = 0; i < bar + 1; i++) {
402 if (fgets(buf, sizeof(buf), f) == NULL) {
403 RTE_LOG(ERR, EAL, "%s(): Cannot read sysfs resource\n", __func__);
407 if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr,
408 &end_addr, &flags) < 0)
411 if (!(flags & IORESOURCE_IO)) {
412 RTE_LOG(ERR, EAL, "%s(): bar resource other than IO is not supported\n", __func__);
415 base = (unsigned long)phys_addr;
416 RTE_LOG(INFO, EAL, "%s(): PIO BAR %08lx detected\n", __func__, base);
418 if (base > UINT16_MAX)
421 /* FIXME only for primary process ? */
422 if (dev->intr_handle.type == RTE_INTR_HANDLE_UNKNOWN) {
423 int uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname), 0);
425 RTE_LOG(ERR, EAL, "cannot open %s: %s\n",
426 dirname, strerror(errno));
430 snprintf(filename, sizeof(filename), "/dev/uio%u", uio_num);
431 dev->intr_handle.fd = open(filename, O_RDWR);
432 if (dev->intr_handle.fd < 0) {
433 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
434 filename, strerror(errno));
437 dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
440 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%lx\n", base);
453 pci_uio_ioport_map(struct rte_pci_device *dev, int bar,
454 struct rte_pci_ioport *p)
458 char filename[PATH_MAX];
459 uint64_t phys_addr, end_addr, flags;
463 /* open and read addresses of the corresponding resource in sysfs */
464 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource",
465 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus,
466 dev->addr.devid, dev->addr.function);
467 f = fopen(filename, "r");
469 RTE_LOG(ERR, EAL, "Cannot open sysfs resource: %s\n",
473 for (i = 0; i < bar + 1; i++) {
474 if (fgets(buf, sizeof(buf), f) == NULL) {
475 RTE_LOG(ERR, EAL, "Cannot read sysfs resource\n");
479 if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr,
480 &end_addr, &flags) < 0)
482 if ((flags & IORESOURCE_IO) == 0) {
483 RTE_LOG(ERR, EAL, "BAR %d is not an IO resource\n", bar);
486 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource%d",
487 rte_pci_get_sysfs_path(), dev->addr.domain, dev->addr.bus,
488 dev->addr.devid, dev->addr.function, bar);
490 /* mmap the pci resource */
491 fd = open(filename, O_RDWR);
493 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename,
497 addr = mmap(NULL, end_addr + 1, PROT_READ | PROT_WRITE,
500 if (addr == MAP_FAILED) {
501 RTE_LOG(ERR, EAL, "Cannot mmap IO port resource: %s\n",
506 /* strangely, the base address is mmap addr + phys_addr */
507 p->base = (uintptr_t)addr + phys_addr;
508 p->len = end_addr + 1;
509 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%"PRIx64"\n", p->base);
521 pci_uio_ioport_read(struct rte_pci_ioport *p,
522 void *data, size_t len, off_t offset)
526 uintptr_t reg = p->base + offset;
528 for (d = data; len > 0; d += size, reg += size, len -= size) {
531 #if defined(RTE_ARCH_X86)
532 *(uint32_t *)d = inl(reg);
534 *(uint32_t *)d = *(volatile uint32_t *)reg;
536 } else if (len >= 2) {
538 #if defined(RTE_ARCH_X86)
539 *(uint16_t *)d = inw(reg);
541 *(uint16_t *)d = *(volatile uint16_t *)reg;
545 #if defined(RTE_ARCH_X86)
548 *d = *(volatile uint8_t *)reg;
555 pci_uio_ioport_write(struct rte_pci_ioport *p,
556 const void *data, size_t len, off_t offset)
560 uintptr_t reg = p->base + offset;
562 for (s = data; len > 0; s += size, reg += size, len -= size) {
565 #if defined(RTE_ARCH_X86)
566 outl_p(*(const uint32_t *)s, reg);
568 *(volatile uint32_t *)reg = *(const uint32_t *)s;
570 } else if (len >= 2) {
572 #if defined(RTE_ARCH_X86)
573 outw_p(*(const uint16_t *)s, reg);
575 *(volatile uint16_t *)reg = *(const uint16_t *)s;
579 #if defined(RTE_ARCH_X86)
582 *(volatile uint8_t *)reg = *s;
589 pci_uio_ioport_unmap(struct rte_pci_ioport *p)
591 #if defined(RTE_ARCH_X86)
593 /* FIXME close intr fd ? */
596 return munmap((void *)(uintptr_t)p->base, p->len);