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ndctl/0102-util-sysfs-Uplevel-mod...

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From ecd7e6e7aabfa2592f3f739a725d135eb43d6314 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Sun, 23 Jan 2022 16:53:13 -0800
Subject: [PATCH 102/217] util/sysfs: Uplevel modalias lookup helper to util/
The to_module() helper looks up modules relative to a modalias. Uplevel
this to share with libcxl.
Link: https://lore.kernel.org/r/164298559346.3021641.11059026790676662837.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
ndctl/lib/libndctl.c | 33 +++++----------------------------
util/sysfs.c | 27 +++++++++++++++++++++++++++
util/sysfs.h | 8 ++++++++
3 files changed, 40 insertions(+), 28 deletions(-)
diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
index 47a234c..1374ad9 100644
--- a/ndctl/lib/libndctl.c
+++ b/ndctl/lib/libndctl.c
@@ -1668,7 +1668,6 @@ static enum ndctl_fwa_result fwa_result_to_result(const char *result)
static int ndctl_bind(struct ndctl_ctx *ctx, struct kmod_module *module,
const char *devname);
static int ndctl_unbind(struct ndctl_ctx *ctx, const char *devpath);
-static struct kmod_module *to_module(struct ndctl_ctx *ctx, const char *alias);
static int populate_dimm_attributes(struct ndctl_dimm *dimm,
const char *dimm_base,
@@ -1878,7 +1877,7 @@ static void *add_dimm(void *parent, int id, const char *dimm_base)
sprintf(path, "%s/modalias", dimm_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
goto err_read;
- dimm->module = to_module(ctx, buf);
+ dimm->module = util_modalias_to_module(ctx, buf);
dimm->handle = -1;
dimm->phys_id = -1;
@@ -2597,7 +2596,7 @@ static void *add_region(void *parent, int id, const char *region_base)
sprintf(path, "%s/modalias", region_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
goto err_read;
- region->module = to_module(ctx, buf);
+ region->module = util_modalias_to_module(ctx, buf);
sprintf(path, "%s/numa_node", region_base);
if ((rc = sysfs_read_attr(ctx, path, buf)) == 0)
@@ -3885,28 +3884,6 @@ NDCTL_EXPORT struct ndctl_ctx *ndctl_mapping_get_ctx(
return ndctl_mapping_get_bus(mapping)->ctx;
}
-static struct kmod_module *to_module(struct ndctl_ctx *ctx, const char *alias)
-{
- struct kmod_list *list = NULL;
- struct kmod_module *mod;
- int rc;
-
- if (!ctx->kmod_ctx)
- return NULL;
-
- rc = kmod_module_new_from_lookup(ctx->kmod_ctx, alias, &list);
- if (rc < 0 || !list) {
- dbg(ctx, "failed to find module for alias: %s %d list: %s\n",
- alias, rc, list ? "populated" : "empty");
- return NULL;
- }
- mod = kmod_module_get_module(list);
- dbg(ctx, "alias: %s module: %s\n", alias, kmod_module_get_name(mod));
- kmod_module_unref_list(list);
-
- return mod;
-}
-
static char *get_block_device(struct ndctl_ctx *ctx, const char *block_path)
{
char *bdev_name = NULL;
@@ -4069,7 +4046,7 @@ static void *add_namespace(void *parent, int id, const char *ndns_base)
sprintf(path, "%s/modalias", ndns_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
goto err_read;
- ndns->module = to_module(ctx, buf);
+ ndns->module = util_modalias_to_module(ctx, buf);
ndctl_namespace_foreach(region, ndns_dup)
if (ndns_dup->id == ndns->id) {
@@ -5182,7 +5159,7 @@ static void *add_btt(void *parent, int id, const char *btt_base)
sprintf(path, "%s/modalias", btt_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
goto err_read;
- btt->module = to_module(ctx, buf);
+ btt->module = util_modalias_to_module(ctx, buf);
sprintf(path, "%s/uuid", btt_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
@@ -5533,7 +5510,7 @@ static void *__add_pfn(struct ndctl_pfn *pfn, const char *pfn_base)
sprintf(path, "%s/modalias", pfn_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
goto err_read;
- pfn->module = to_module(ctx, buf);
+ pfn->module = util_modalias_to_module(ctx, buf);
sprintf(path, "%s/uuid", pfn_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
diff --git a/util/sysfs.c b/util/sysfs.c
index cfbab7d..23330cb 100644
--- a/util/sysfs.c
+++ b/util/sysfs.c
@@ -10,6 +10,7 @@
#include <ctype.h>
#include <fcntl.h>
#include <dirent.h>
+#include <libkmod.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
@@ -118,3 +119,29 @@ int __sysfs_device_parse(struct log_ctx *ctx, const char *base_path,
return add_errors;
}
+
+struct kmod_module *__util_modalias_to_module(struct kmod_ctx *kmod_ctx,
+ const char *alias,
+ struct log_ctx *log)
+{
+ struct kmod_list *list = NULL;
+ struct kmod_module *mod;
+ int rc;
+
+ if (!kmod_ctx)
+ return NULL;
+
+ rc = kmod_module_new_from_lookup(kmod_ctx, alias, &list);
+ if (rc < 0 || !list) {
+ log_dbg(log,
+ "failed to find module for alias: %s %d list: %s\n",
+ alias, rc, list ? "populated" : "empty");
+ return NULL;
+ }
+ mod = kmod_module_get_module(list);
+ log_dbg(log, "alias: %s module: %s\n", alias,
+ kmod_module_get_name(mod));
+ kmod_module_unref_list(list);
+
+ return mod;
+}
diff --git a/util/sysfs.h b/util/sysfs.h
index 6485a73..bdee4f5 100644
--- a/util/sysfs.h
+++ b/util/sysfs.h
@@ -27,4 +27,12 @@ static inline const char *devpath_to_devname(const char *devpath)
{
return strrchr(devpath, '/') + 1;
}
+
+struct kmod_ctx;
+struct kmod_module;
+struct kmod_module *__util_modalias_to_module(struct kmod_ctx *kmod_ctx,
+ const char *alias,
+ struct log_ctx *log);
+#define util_modalias_to_module(ctx, buf) \
+ __util_modalias_to_module((ctx)->kmod_ctx, buf, &(ctx)->ctx)
#endif /* __UTIL_SYSFS_H__ */
--
2.27.0
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