In preparation for a reconfigure-device command, add an interface to retrieve the 'mode' of a dax device. This will allow the reconfigure-device command (and via daxctl_dev_to_json(), also daxctl-list) to print the mode in device listings via a 'daxctl-list' command or immediately after a mode change.
Add a 'state' attribute to the json listings for devices, since a device could end up in a state where it is not bound to any driver, and hence, 'disabled'. The state attribute is only displayed for disabled devices. Cc: Dave Hansen <[email protected]> Cc: Dan Williams <[email protected]> Signed-off-by: Vishal Verma <[email protected]> --- daxctl/lib/libdaxctl.c | 37 +++++++++++++++++++++++++++++++++++++ daxctl/lib/libdaxctl.sym | 1 + daxctl/libdaxctl.h | 1 + util/json.c | 17 +++++++++++++++++ 4 files changed, 56 insertions(+) diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c index b22df50..9ff6235 100644 --- a/daxctl/lib/libdaxctl.c +++ b/daxctl/lib/libdaxctl.c @@ -12,6 +12,8 @@ */ #include <stdio.h> #include <errno.h> +#include <limits.h> +#include <libgen.h> #include <stdlib.h> #include <dirent.h> #include <unistd.h> @@ -880,6 +882,41 @@ DAXCTL_EXPORT int daxctl_dev_disable(struct daxctl_dev *dev) return 0; } +DAXCTL_EXPORT enum daxctl_dev_mode daxctl_dev_get_mode(struct daxctl_dev *dev) +{ + const char *devname = daxctl_dev_get_devname(dev); + struct daxctl_ctx *ctx = daxctl_dev_get_ctx(dev); + int rc = DAXCTL_DEV_MODE_UNKNOWN; + char path[200]; + const int len = sizeof(path); + char *mod_path, *mod_base; + + if (!daxctl_dev_is_enabled(dev)) + return rc; + + if (snprintf(path, len, "%s/driver/module", dev->dev_path) >= len) { + err(ctx, "%s: buffer too small!\n", devname); + return -ENXIO; + } + + mod_path = realpath(path, NULL); + if (!mod_path) { + rc = -errno; + err(ctx, "%s: unable to determine module: %s\n", devname, + strerror(errno)); + return rc; + } + + mod_base = basename(mod_path); + if (strcmp(mod_base, dax_modules[DAXCTL_DEV_MODE_RAM]) == 0) + rc = DAXCTL_DEV_MODE_RAM; + else if (strcmp(mod_base, dax_modules[DAXCTL_DEV_MODE_DEVDAX]) == 0) + rc = DAXCTL_DEV_MODE_DEVDAX; + + free(mod_path); + return rc; +} + DAXCTL_EXPORT struct daxctl_ctx *daxctl_dev_get_ctx(struct daxctl_dev *dev) { return dev->region->ctx; diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym index 53eb700..9ce5096 100644 --- a/daxctl/lib/libdaxctl.sym +++ b/daxctl/lib/libdaxctl.sym @@ -67,4 +67,5 @@ global: daxctl_memory_set_online; daxctl_memory_set_offline; daxctl_memory_is_online; + daxctl_dev_get_mode; } LIBDAXCTL_5; diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h index a5a2bab..6d1c17d 100644 --- a/daxctl/libdaxctl.h +++ b/daxctl/libdaxctl.h @@ -74,6 +74,7 @@ int daxctl_dev_disable(struct daxctl_dev *dev); int daxctl_dev_enable_devdax(struct daxctl_dev *dev); int daxctl_dev_enable_ram(struct daxctl_dev *dev); int daxctl_dev_get_target_node(struct daxctl_dev *dev); +enum daxctl_dev_mode daxctl_dev_get_mode(struct daxctl_dev *dev); struct daxctl_memory; struct daxctl_memory *daxctl_dev_get_memory(struct daxctl_dev *dev); diff --git a/util/json.c b/util/json.c index f521337..1673f1d 100644 --- a/util/json.c +++ b/util/json.c @@ -271,6 +271,7 @@ struct json_object *util_daxctl_dev_to_json(struct daxctl_dev *dev, { const char *devname = daxctl_dev_get_devname(dev); struct json_object *jdev, *jobj; + enum daxctl_dev_mode mode; int node; jdev = json_object_new_object(); @@ -292,6 +293,22 @@ struct json_object *util_daxctl_dev_to_json(struct daxctl_dev *dev, json_object_object_add(jdev, "target_node", jobj); } + mode = daxctl_dev_get_mode(dev); + if (mode >= 0) { + if (mode == DAXCTL_DEV_MODE_RAM) + jobj = json_object_new_string("system-ram"); + else + jobj = json_object_new_string("devdax"); + if (jobj) + json_object_object_add(jdev, "mode", jobj); + } + + if (!daxctl_dev_is_enabled(dev)) { + jobj = json_object_new_string("disabled"); + if (jobj) + json_object_object_add(jdev, "state", jobj); + } + return jdev; } -- 2.20.1 _______________________________________________ Linux-nvdimm mailing list [email protected] https://lists.01.org/mailman/listinfo/linux-nvdimm
