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-rw-r--r--nvme-topology.c801
1 files changed, 0 insertions, 801 deletions
diff --git a/nvme-topology.c b/nvme-topology.c
deleted file mode 100644
index 0a22f6b..0000000
--- a/nvme-topology.c
+++ /dev/null
@@ -1,801 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-
-#include "nvme.h"
-#include "nvme-ioctl.h"
-
-#ifdef HAVE_SYSTEMD
-#include <systemd/sd-id128.h>
-#define NVME_HOSTNQN_ID SD_ID128_MAKE(c7,f4,61,81,12,be,49,32,8c,83,10,6f,9d,dd,d8,6b)
-#endif
-
-static const char *dev = "/dev/";
-static const char *subsys_dir = "/sys/class/nvme-subsystem/";
-static void free_ctrl(struct nvme_ctrl *c);
-
-char *get_nvme_subsnqn(char *path)
-{
- char sspath[320], *subsysnqn;
- int fd, ret;
-
- snprintf(sspath, sizeof(sspath), "%s/subsysnqn", path);
-
- fd = open(sspath, O_RDONLY);
- if (fd < 0) {
- fprintf(stderr, "Failed to open %s: %s\n",
- sspath, strerror(errno));
- return NULL;
- }
-
- subsysnqn = calloc(1, 256);
- if (!subsysnqn)
- goto close_fd;
-
- ret = read(fd, subsysnqn, 256);
- if (ret < 0) {
- fprintf(stderr, "Failed to read %s: %s\n", sspath,
- strerror(errno));
- free(subsysnqn);
- subsysnqn = NULL;
- } else if (subsysnqn[strlen(subsysnqn) - 1] == '\n') {
- subsysnqn[strlen(subsysnqn) - 1] = '\0';
- }
-
-close_fd:
- close(fd);
- return subsysnqn;
-}
-
-char *nvme_get_ctrl_attr(const char *path, const char *attr)
-{
- char *attrpath, *value;
- ssize_t ret;
- int fd, i;
-
- ret = asprintf(&attrpath, "%s/%s", path, attr);
- if (ret < 0)
- return NULL;
-
- value = calloc(1, 1024);
- if (!value)
- goto err_free_path;
-
- fd = open(attrpath, O_RDONLY);
- if (fd < 0)
- goto err_free_value;
-
- ret = read(fd, value, 1024);
- if (ret < 0) {
- fprintf(stderr, "read :%s :%s\n", attrpath, strerror(errno));
- goto err_close_fd;
- }
-
- if (value[strlen(value) - 1] == '\n')
- value[strlen(value) - 1] = '\0';
-
- for (i = 0; i < strlen(value); i++) {
- if (value[i] == ',' )
- value[i] = ' ';
- }
-
- close(fd);
- free(attrpath);
- return value;
-err_close_fd:
- close(fd);
-err_free_value:
- free(value);
-err_free_path:
- free(attrpath);
- return NULL;
-}
-
-static char *path_trim_last(char *path, char needle)
-{
- int i;
- i = strlen(path);
- if (i>0 && path[i-1] == needle) // remove trailing slash
- path[--i] = 0;
- for (; i>0; i--)
- if (path[i] == needle) {
- path[i] = 0;
- return path+i+1;
- }
- return NULL;
-}
-
-static void legacy_get_pci_bdf(char *node, char *bdf)
-{
- int ret;
- char path[264], nodetmp[264];
- struct stat st;
- char *p, *__path = path;
-
- bdf[0] = 0;
- strcpy(nodetmp, node);
- p = path_trim_last(nodetmp, '/');
- sprintf(path, "/sys/block/%s/device", p);
- ret = readlink(path, nodetmp, sizeof(nodetmp));
- if (ret <= 0)
- return;
- nodetmp[ret] = 0;
- /* The link value is either "device -> ../../../0000:86:00.0" or "device -> ../../nvme0" */
- (void) path_trim_last(path, '/');
- sprintf(path+strlen(path), "/%s/device", nodetmp);
- ret = stat(path, &st);
- if (ret < 0)
- return;
- if ((st.st_mode & S_IFLNK) == 0) {
- /* follow the second link to get the PCI address */
- ret = readlink(path, __path, sizeof(path));
- if (ret <= 0)
- return;
- path[ret] = 0;
- }
- else
- (void) path_trim_last(path, '/');
-
- p = path_trim_last(path, '/');
- if (p && strlen(p) == 12)
- strcpy(bdf, p);
-}
-
-static int scan_namespace(struct nvme_namespace *n)
-{
- int ret, fd;
- char *path;
-
- ret = asprintf(&path, "%s%s", n->ctrl->path, n->name);
- if (ret < 0)
- return ret;
-
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- ret = fd;
- goto free;
- }
- if (!n->nsid) {
- ret = nvme_get_nsid(fd);
- if (ret < 0)
- goto close_fd;
- n->nsid = ret;
- }
-
- ret = nvme_identify_ns(fd, n->nsid, 0, &n->ns);
-close_fd:
- close(fd);
-free:
- free(path);
- return ret;
-}
-
-static char *get_nvme_ctrl_path_ana_state(char *path, int nsid)
-{
- struct dirent **paths;
- char *ana_state;
- int i, n;
-
- ana_state = calloc(1, 16);
- if (!ana_state)
- return NULL;
-
- n = scandir(path, &paths, scan_ctrl_paths_filter, alphasort);
- if (n <= 0) {
- free(ana_state);
- return NULL;
- }
- for (i = 0; i < n; i++) {
- int id, cntlid, ns, fd;
- char *ctrl_path;
- ssize_t ret;
-
- if (sscanf(paths[i]->d_name, "nvme%dc%dn%d",
- &id, &cntlid, &ns) != 3) {
- if (sscanf(paths[i]->d_name, "nvme%dn%d",
- &id, &ns) != 2) {
- continue;
- }
- }
- if (ns != nsid)
- continue;
-
- ret = asprintf(&ctrl_path, "%s/%s/ana_state",
- path, paths[i]->d_name);
- if (ret < 0) {
- free(ana_state);
- ana_state = NULL;
- break;
- }
- fd = open(ctrl_path, O_RDONLY);
- if (fd < 0) {
- free(ctrl_path);
- free(ana_state);
- ana_state = NULL;
- break;
- }
- ret = read(fd, ana_state, 16);
- if (ret < 0) {
- fprintf(stderr, "Failed to read ANA state from %s\n",
- ctrl_path);
- free(ana_state);
- ana_state = NULL;
- } else if (ana_state[strlen(ana_state) - 1] == '\n')
- ana_state[strlen(ana_state) - 1] = '\0';
- close(fd);
- free(ctrl_path);
- break;
- }
- for (i = 0; i < n; i++)
- free(paths[i]);
- free(paths);
- return ana_state;
-}
-
-static bool ns_attached_to_ctrl(int nsid, struct nvme_ctrl *ctrl)
-{
- struct nvme_namespace *n;
- int i;
-
- for (i = 0; i < ctrl->nr_namespaces; i++) {
- n = &ctrl->namespaces[i];
- if (nsid == n->nsid)
- return true;
- }
- return false;
-}
-
-static int scan_ctrl(struct nvme_ctrl *c, char *p, __u32 ns_instance)
-{
- struct nvme_namespace *n;
- struct dirent **ns;
- char *path;
- int i, fd, ret;
-
- ret = asprintf(&path, "%s/%s", p, c->name);
- if (ret < 0)
- return ret;
-
- c->address = nvme_get_ctrl_attr(path, "address");
- c->transport = nvme_get_ctrl_attr(path, "transport");
- c->state = nvme_get_ctrl_attr(path, "state");
- c->hostnqn = nvme_get_ctrl_attr(path, "hostnqn");
- c->hostid = nvme_get_ctrl_attr(path, "hostid");
-
- if (ns_instance)
- c->ana_state = get_nvme_ctrl_path_ana_state(path, ns_instance);
-
- ret = scandir(path, &ns, scan_ctrl_namespace_filter, alphasort);
- if (ret == -1) {
- fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
- return errno;
- }
-
- c->nr_namespaces = ret;
- c->namespaces = calloc(c->nr_namespaces, sizeof(*n));
- if (c->namespaces) {
- for (i = 0; i < c->nr_namespaces; i++) {
- char *ns_path, nsid[16];
- int ns_fd;
-
- n = &c->namespaces[i];
- n->name = strdup(ns[i]->d_name);
- n->ctrl = c;
- ret = asprintf(&ns_path, "%s/%s/nsid", path, n->name);
- if (ret < 0)
- continue;
- ns_fd = open(ns_path, O_RDONLY);
- if (ns_fd < 0) {
- free(ns_path);
- continue;
- }
- ret = read(ns_fd, nsid, 16);
- if (ret < 0) {
- close(ns_fd);
- free(ns_path);
- continue;
- }
- n->nsid = (unsigned)strtol(nsid, NULL, 10);
- scan_namespace(n);
- close(ns_fd);
- free(ns_path);
- }
- } else {
- i = c->nr_namespaces;
- c->nr_namespaces = 0;
- }
-
- while (i--)
- free(ns[i]);
- free(ns);
- free(path);
-
- ret = asprintf(&path, "%s%s", c->path, c->name);
- if (ret < 0)
- return ret;
-
- fd = open(path, O_RDONLY);
- if (fd < 0)
- goto free;
-
- ret = nvme_identify_ctrl(fd, &c->id);
- if (ret < 0)
- goto close_fd;
-close_fd:
- close(fd);
-free:
- free(path);
- return 0;
-}
-
-static int scan_subsystem(struct nvme_subsystem *s, __u32 ns_instance, int nsid)
-{
- struct dirent **ctrls, **ns;
- struct nvme_namespace *n;
- struct nvme_ctrl *c;
- int i, j = 0, ret;
- char *path;
-
- ret = asprintf(&path, "%s%s", subsys_dir, s->name);
- if (ret < 0)
- return ret;
-
- s->subsysnqn = get_nvme_subsnqn(path);
- ret = scandir(path, &ctrls, scan_ctrls_filter, alphasort);
- if (ret == -1) {
- fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
- return errno;
- }
- s->nr_ctrls = ret;
- s->ctrls = calloc(s->nr_ctrls, sizeof(*c));
- for (i = 0; i < s->nr_ctrls; i++) {
- c = &s->ctrls[j];
- c->name = strdup(ctrls[i]->d_name);
- c->path = strdup(dev);
- c->subsys = s;
- scan_ctrl(c, path, ns_instance);
-
- if (!ns_instance || ns_attached_to_ctrl(nsid, c))
- j++;
- else
- free_ctrl(c);
- }
- s->nr_ctrls = j;
-
- while (i--)
- free(ctrls[i]);
- free(ctrls);
-
- ret = scandir(path, &ns, scan_namespace_filter, alphasort);
- if (ret == -1) {
- fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
- return errno;
- }
-
- s->nr_namespaces = ret;
- s->namespaces = calloc(s->nr_namespaces, sizeof(*n));
- if (s->namespaces) {
- for (i = 0; i < s->nr_namespaces; i++) {
- n = &s->namespaces[i];
- n->name = strdup(ns[i]->d_name);
- for (j = 0; j < s->nr_ctrls; j++) {
- n->ctrl = &s->ctrls[j];
- if (!strcmp(n->ctrl->state, "live") &&
- !scan_namespace(n))
- break;
- }
- }
- } else {
- i = s->nr_namespaces;
- s->nr_namespaces = 0;
- }
-
- while (i--)
- free(ns[i]);
- free(ns);
-
- free(path);
- return 0;
-}
-
-static int verify_legacy_ns(struct nvme_namespace *n)
-{
- struct nvme_ctrl *c = n->ctrl;
- struct nvme_id_ctrl id;
- char *path;
- int ret, fd;
-
- ret = asprintf(&path, "%s%s", n->ctrl->path, n->name);
- if (ret < 0)
- return ret;
-
- if (!n->ctrl->transport && !n->ctrl->address) {
- char tmp_address[64] = "";
- legacy_get_pci_bdf(path, tmp_address);
- if (tmp_address[0]) {
- if (asprintf(&n->ctrl->transport, "pcie") < 0)
- return -1;
- if (asprintf(&n->ctrl->address, "%s", tmp_address) < 0)
- return -1;
- }
- }
-
- fd = open(path, O_RDONLY);
- free (path);
-
- if (fd < 0)
- return fd;
-
- ret = nvme_identify_ctrl(fd, &id);
- close(fd);
-
- if (ret)
- return ret;
-
- if (memcmp(id.mn, c->id.mn, sizeof(id.mn)) ||
- memcmp(id.sn, c->id.sn, sizeof(id.sn)))
- return -ENODEV;
- return 0;
-}
-
-/*
- * For pre-subsystem enabled kernel. Topology information is limited, but we can
- * assume controller names are always a prefix to their namespaces, i.e. nvme0
- * is the controller to nvme0n1 for such older kernels. We will also assume
- * every controller is its own subsystem.
- */
-static int legacy_list(struct nvme_topology *t, char *dev_dir)
-{
- struct nvme_ctrl *c;
- struct nvme_subsystem *s;
- struct nvme_namespace *n;
- struct dirent **devices, **namespaces;
- int ret = 0, fd, i;
- char *path;
-
- t->nr_subsystems = scandir(dev_dir, &devices, scan_ctrls_filter, alphasort);
- if (t->nr_subsystems == -1) {
- fprintf(stderr, "Failed to open %s: %s\n", dev_dir, strerror(errno));
- return errno;
- }
-
- t->subsystems = calloc(t->nr_subsystems, sizeof(*s));
- for (i = 0; i < t->nr_subsystems; i++) {
- int j;
-
- s = &t->subsystems[i];
- s->nr_ctrls = 1;
- s->ctrls = calloc(s->nr_ctrls, sizeof(*c));
- s->name = strdup(devices[i]->d_name);
- s->subsysnqn = strdup(s->name);
- s->nr_namespaces = 0;
-
- c = s->ctrls;
- c->name = strdup(s->name);
- sscanf(c->name, "nvme%d", &current_index);
- c->path = strdup(dev_dir);
- c->nr_namespaces = scandir(c->path, &namespaces, scan_dev_filter,
- alphasort);
- c->namespaces = calloc(c->nr_namespaces, sizeof(*n));
- if (!c->namespaces) {
- while (c->nr_namespaces--)
- free(namespaces[c->nr_namespaces]);
- free(namespaces);
- continue;
- }
-
- ret = asprintf(&path, "%s%s", c->path, c->name);
- if (ret < 0)
- continue;
- ret = 0;
-
- fd = open(path, O_RDONLY);
- if (fd > 0) {
- nvme_identify_ctrl(fd, &c->id);
- close(fd);
- }
- free(path);
-
- for (j = 0; j < c->nr_namespaces; j++) {
- n = &c->namespaces[j];
- n->name = strdup(namespaces[j]->d_name);
- n->ctrl = c;
- scan_namespace(n);
- ret = verify_legacy_ns(n);
- if (ret)
- goto free;
- }
- while (j--)
- free(namespaces[j]);
- free(namespaces);
- }
-
-free:
- while (i--)
- free(devices[i]);
- free(devices);
- return ret;
-}
-
-static void free_ctrl(struct nvme_ctrl *c)
-{
- int i;
-
- for (i = 0; i < c->nr_namespaces; i++) {
- struct nvme_namespace *n = &c->namespaces[i];
- free(n->name);
- }
- free(c->name);
- free(c->path);
- free(c->transport);
- free(c->address);
- free(c->state);
- free(c->hostnqn);
- free(c->hostid);
- free(c->ana_state);
- free(c->namespaces);
-}
-
-static void free_subsystem(struct nvme_subsystem *s)
-{
- int i;
-
- for (i = 0; i < s->nr_ctrls; i++)
- free_ctrl(&s->ctrls[i]);
- for (i = 0; i < s->nr_namespaces; i++) {
- struct nvme_namespace *n = &s->namespaces[i];
- free(n->name);
- }
- free(s->name);
- free(s->subsysnqn);
- free(s->ctrls);
- free(s->namespaces);
-}
-
-static int scan_subsystem_dir(struct nvme_topology *t, char *dev_dir)
-{
- struct nvme_topology dev_dir_t = { };
- int ret, i, total_nr_subsystems;
-
- ret = legacy_list(&dev_dir_t, dev_dir);
- if (ret != 0)
- return ret;
-
- total_nr_subsystems = t->nr_subsystems + dev_dir_t.nr_subsystems;
- t->subsystems = realloc(t->subsystems,
- total_nr_subsystems * sizeof(struct nvme_subsystem));
- for (i = 0; i < dev_dir_t.nr_subsystems; i++){
- t->subsystems[i+t->nr_subsystems] = dev_dir_t.subsystems[i];
- }
- t->nr_subsystems = total_nr_subsystems;
-
- return 0;
-}
-
-int scan_subsystems(struct nvme_topology *t, const char *subsysnqn,
- __u32 ns_instance, int nsid, char *dev_dir)
-{
- struct nvme_subsystem *s;
- struct dirent **subsys;
- int ret = 0, i, j = 0;
-
- t->nr_subsystems = scandir(subsys_dir, &subsys, scan_subsys_filter,
- alphasort);
- if (t->nr_subsystems < 0) {
- ret = legacy_list(t, (char *)dev);
- if (ret != 0)
- return ret;
- } else {
-
- t->subsystems = calloc(t->nr_subsystems, sizeof(*s));
- for (i = 0; i < t->nr_subsystems; i++) {
- s = &t->subsystems[j];
- s->name = strdup(subsys[i]->d_name);
- scan_subsystem(s, ns_instance, nsid);
-
- if (!subsysnqn || !strcmp(s->subsysnqn, subsysnqn))
- j++;
- else
- free_subsystem(s);
- }
- t->nr_subsystems = j;
-
- while (i--)
- free(subsys[i]);
- free(subsys);
- }
-
- if (dev_dir != NULL && strcmp(dev_dir, "/dev/")) {
- ret = scan_subsystem_dir(t, dev_dir);
- }
-
- return ret;
-}
-
-void free_topology(struct nvme_topology *t)
-{
- int i;
-
- for (i = 0; i < t->nr_subsystems; i++)
- free_subsystem(&t->subsystems[i]);
- free(t->subsystems);
-}
-
-char *nvme_char_from_block(char *dev)
-{
- char *path = NULL;
- char buf[256] = {0};
- int ret, id, nsid;
-
- ret = sscanf(dev, "nvme%dn%d", &id, &nsid);
- switch (ret) {
- case 1:
- return strdup(dev);
- break;
- case 2:
- if (asprintf(&path, "/sys/block/%s/device", dev) < 0)
- path = NULL;
- break;
- default:
- fprintf(stderr, "%s is not an nvme device\n", dev);
- return NULL;
- }
-
- if (!path)
- return NULL;
-
- ret = readlink(path, buf, sizeof(buf));
- if (ret > 0) {
- char *r = strdup(basename(buf));
-
- free(path);
- if (sscanf(r, "nvme%d", &id) != 1) {
- fprintf(stderr, "%s is not a physical nvme controller\n", r);
- free(r);
- r = NULL;
- }
- return r;
- }
-
- free(path);
- ret = asprintf(&path, "nvme%d", id);
- if (ret < 0)
- return NULL;
- return path;
-}
-
-int nvme_logical_block_size_from_ns_char(const char *dev)
-{
- int ret;
- int id, nsid;
- char *path = NULL;
- char *s;
-
- ret = sscanf(dev, "ng%dn%d", &id, &nsid);
- if (ret != 2)
- return -EINVAL;
-
- if (asprintf(&path, "/sys/block/nvme%dn%d/queue", id, nsid) < 0)
- path = NULL;
-
- if (!path)
- return -EINVAL;
-
- s = nvme_get_ctrl_attr(path, "logical_block_size");
- if (!s)
- return -EINVAL;
-
- return atoi(s);
-}
-
-void *mmap_registers(const char *dev)
-{
- int fd;
- char *base, path[512];
- void *membase;
-
- base = nvme_char_from_block((char *)dev);
- if (!base)
- return NULL;
-
- sprintf(path, "/sys/class/nvme/%s/device/resource0", base);
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- sprintf(path, "/sys/class/misc/%s/device/resource0", base);
- fd = open(path, O_RDONLY);
- }
- if (fd < 0) {
- fprintf(stderr, "%s did not find a pci resource, open failed %s\n",
- base, strerror(errno));
- free(base);
- return NULL;
- }
-
- membase = mmap(NULL, getpagesize(), PROT_READ, MAP_SHARED, fd, 0);
- if (membase == MAP_FAILED) {
- fprintf(stderr, "%s failed to map. ", base);
- fprintf(stderr, "Did your kernel enable CONFIG_IO_STRICT_DEVMEM?\n");
- membase = NULL;
- }
-
- free(base);
- close(fd);
- return membase;
-}
-
-#define PATH_DMI_ENTRIES "/sys/firmware/dmi/entries"
-
-int uuid_from_dmi(char *system_uuid)
-{
- int f;
- DIR *d;
- struct dirent *de;
- char buf[512];
-
- system_uuid[0] = '\0';
- d = opendir(PATH_DMI_ENTRIES);
- if (!d)
- return -ENXIO;
- while ((de = readdir(d))) {
- char filename[PATH_MAX];
- int len, type;
-
- if (de->d_name[0] == '.')
- continue;
- sprintf(filename, "%s/%s/type", PATH_DMI_ENTRIES, de->d_name);
- f = open(filename, O_RDONLY);
- if (f < 0)
- continue;
- len = read(f, buf, 512);
- close(f);
- if (len < 0)
- continue;
- if (sscanf(buf, "%d", &type) != 1)
- continue;
- if (type != 1)
- continue;
- sprintf(filename, "%s/%s/raw", PATH_DMI_ENTRIES, de->d_name);
- f = open(filename, O_RDONLY);
- if (f < 0)
- continue;
- len = read(f, buf, 512);
- close(f);
- if (len < 0)
- continue;
- /* Sigh. https://en.wikipedia.org/wiki/Overengineering */
- /* DMTF SMBIOS 3.0 Section 7.2.1 System UUID */
- sprintf(system_uuid,
- "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
- "%02x%02x%02x%02x%02x%02x",
- (uint8_t)buf[8 + 3], (uint8_t)buf[8 + 2],
- (uint8_t)buf[8 + 1], (uint8_t)buf[8 + 0],
- (uint8_t)buf[8 + 5], (uint8_t)buf[8 + 4],
- (uint8_t)buf[8 + 7], (uint8_t)buf[8 + 6],
- (uint8_t)buf[8 + 8], (uint8_t)buf[8 + 9],
- (uint8_t)buf[8 + 10], (uint8_t)buf[8 + 11],
- (uint8_t)buf[8 + 12], (uint8_t)buf[8 + 13],
- (uint8_t)buf[8 + 14], (uint8_t)buf[8 + 15]);
- break;
- }
- closedir(d);
- return strlen(system_uuid) ? 0 : -ENXIO;
-}
-
-int uuid_from_systemd(char *systemd_uuid)
-{
-#ifdef HAVE_SYSTEMD
- sd_id128_t id;
-
- if (sd_id128_get_machine_app_specific(NVME_HOSTNQN_ID, &id) < 0)
- return -ENXIO;
-
- sprintf(systemd_uuid, SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
- return 0;
-#else
- return -ENOTSUP;
-#endif
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-05 23:21:15 +0000