[ndctl PATCH v2 1/6] libndctl: Refactor out add_dimm() to handle NFIT specific init

[Vaibhav Jain <vaibhav@linux.ibm.com>]

Presently add_dimm() only probes dimms that support NFIT/ACPI. Hence
this patch refactors this functionality into two functions namely
add_dimm() and add_nfit_dimm(). Function add_dimm() performs
allocation and common 'struct ndctl_dimm' initialization and depending
on whether the dimm-bus supports NIFT, calls add_nfit_dimm(). Once
the probe is completed based on the value of 'ndctl_dimm.cmd_family'
appropriate dimm-ops are assigned to the dimm.

In case dimm-bus is of unknown type or doesn't support NFIT the
initialization still continues, with no dimm-ops assigned to the
'struct ndctl_dimm' there-by limiting the functionality available.

This patch shouldn't introduce any behavioral change.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
Changelog:

v1..v2:
* None
---
 ndctl/lib/libndctl.c | 193 +++++++++++++++++++++++++------------------
 1 file changed, 112 insertions(+), 81 deletions(-)

diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
index ee737cbbfe3e..d76dbf7e17de 100644
--- a/ndctl/lib/libndctl.c
+++ b/ndctl/lib/libndctl.c
@@ -1441,82 +1441,15 @@ static int ndctl_bind(struct ndctl_ctx *ctx, struct kmod_module *module,
 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 void *add_dimm(void *parent, int id, const char *dimm_base)
+static int add_nfit_dimm(struct ndctl_dimm *dimm, const char *dimm_base)
 {
-	int formats, i;
-	struct ndctl_dimm *dimm;
+	int i, rc = -1;
 	char buf[SYSFS_ATTR_SIZE];
-	struct ndctl_bus *bus = parent;
-	struct ndctl_ctx *ctx = bus->ctx;
+	struct ndctl_ctx *ctx = dimm->bus->ctx;
 	char *path = calloc(1, strlen(dimm_base) + 100);
 
 	if (!path)
-		return NULL;
-
-	sprintf(path, "%s/nfit/formats", dimm_base);
-	if (sysfs_read_attr(ctx, path, buf) < 0)
-		formats = 1;
-	else
-		formats = clamp(strtoul(buf, NULL, 0), 1UL, 2UL);
-
-	dimm = calloc(1, sizeof(*dimm) + sizeof(int) * formats);
-	if (!dimm)
-		goto err_dimm;
-	dimm->bus = bus;
-	dimm->id = id;
-
-	sprintf(path, "%s/dev", dimm_base);
-	if (sysfs_read_attr(ctx, path, buf) < 0)
-		goto err_read;
-	if (sscanf(buf, "%d:%d", &dimm->major, &dimm->minor) != 2)
-		goto err_read;
-
-	sprintf(path, "%s/commands", dimm_base);
-	if (sysfs_read_attr(ctx, path, buf) < 0)
-		goto err_read;
-	dimm->cmd_mask = parse_commands(buf, 1);
-
-	dimm->dimm_buf = calloc(1, strlen(dimm_base) + 50);
-	if (!dimm->dimm_buf)
-		goto err_read;
-	dimm->buf_len = strlen(dimm_base) + 50;
-
-	dimm->dimm_path = strdup(dimm_base);
-	if (!dimm->dimm_path)
-		goto err_read;
-
-	sprintf(path, "%s/modalias", dimm_base);
-	if (sysfs_read_attr(ctx, path, buf) < 0)
-		goto err_read;
-	dimm->module = to_module(ctx, buf);
-
-	dimm->handle = -1;
-	dimm->phys_id = -1;
-	dimm->serial = -1;
-	dimm->vendor_id = -1;
-	dimm->device_id = -1;
-	dimm->revision_id = -1;
-	dimm->health_eventfd = -1;
-	dimm->dirty_shutdown = -ENOENT;
-	dimm->subsystem_vendor_id = -1;
-	dimm->subsystem_device_id = -1;
-	dimm->subsystem_revision_id = -1;
-	dimm->manufacturing_date = -1;
-	dimm->manufacturing_location = -1;
-	dimm->cmd_family = -1;
-	dimm->nfit_dsm_mask = ULONG_MAX;
-	for (i = 0; i < formats; i++)
-		dimm->format[i] = -1;
-
-	sprintf(path, "%s/flags", dimm_base);
-	if (sysfs_read_attr(ctx, path, buf) < 0) {
-		dimm->locked = -1;
-		dimm->aliased = -1;
-	} else
-		parse_dimm_flags(dimm, buf);
-
-	if (!ndctl_bus_has_nfit(bus))
-		goto out;
+		return -1;
 
 	/*
 	 * 'unique_id' may not be available on older kernels, so don't
@@ -1582,24 +1515,15 @@ static void *add_dimm(void *parent, int id, const char *dimm_base)
 	sprintf(path, "%s/nfit/family", dimm_base);
 	if (sysfs_read_attr(ctx, path, buf) == 0)
 		dimm->cmd_family = strtoul(buf, NULL, 0);
-	if (dimm->cmd_family == NVDIMM_FAMILY_INTEL)
-		dimm->ops = intel_dimm_ops;
-	if (dimm->cmd_family == NVDIMM_FAMILY_HPE1)
-		dimm->ops = hpe1_dimm_ops;
-	if (dimm->cmd_family == NVDIMM_FAMILY_MSFT)
-		dimm->ops = msft_dimm_ops;
-	if (dimm->cmd_family == NVDIMM_FAMILY_HYPERV)
-		dimm->ops = hyperv_dimm_ops;
 
 	sprintf(path, "%s/nfit/dsm_mask", dimm_base);
 	if (sysfs_read_attr(ctx, path, buf) == 0)
 		dimm->nfit_dsm_mask = strtoul(buf, NULL, 0);
 
-	dimm->formats = formats;
 	sprintf(path, "%s/nfit/format", dimm_base);
 	if (sysfs_read_attr(ctx, path, buf) == 0)
 		dimm->format[0] = strtoul(buf, NULL, 0);
-	for (i = 1; i < formats; i++) {
+	for (i = 1; i < dimm->formats; i++) {
 		sprintf(path, "%s/nfit/format%d", dimm_base, i);
 		if (sysfs_read_attr(ctx, path, buf) == 0)
 			dimm->format[i] = strtoul(buf, NULL, 0);
@@ -1610,7 +1534,114 @@ static void *add_dimm(void *parent, int id, const char *dimm_base)
 		parse_nfit_mem_flags(dimm, buf);
 
 	dimm->health_eventfd = open(path, O_RDONLY|O_CLOEXEC);
+	rc = 0;
+ err_read:
+
+	free(path);
+	return rc;
+}
+
+static void *add_dimm(void *parent, int id, const char *dimm_base)
+{
+	int formats, i, rc = -ENODEV;
+	struct ndctl_dimm *dimm = NULL;
+	char buf[SYSFS_ATTR_SIZE];
+	struct ndctl_bus *bus = parent;
+	struct ndctl_ctx *ctx = bus->ctx;
+	char *path = calloc(1, strlen(dimm_base) + 100);
+
+	if (!path)
+		return NULL;
+
+	sprintf(path, "%s/nfit/formats", dimm_base);
+	if (sysfs_read_attr(ctx, path, buf) < 0)
+		formats = 1;
+	else
+		formats = clamp(strtoul(buf, NULL, 0), 1UL, 2UL);
+
+	dimm = calloc(1, sizeof(*dimm) + sizeof(int) * formats);
+	if (!dimm)
+		goto err_dimm;
+	dimm->bus = bus;
+	dimm->id = id;
+
+	sprintf(path, "%s/dev", dimm_base);
+	if (sysfs_read_attr(ctx, path, buf) < 0)
+		goto err_read;
+	if (sscanf(buf, "%d:%d", &dimm->major, &dimm->minor) != 2)
+		goto err_read;
+
+	sprintf(path, "%s/commands", dimm_base);
+	if (sysfs_read_attr(ctx, path, buf) < 0)
+		goto err_read;
+	dimm->cmd_mask = parse_commands(buf, 1);
+
+	dimm->dimm_buf = calloc(1, strlen(dimm_base) + 50);
+	if (!dimm->dimm_buf)
+		goto err_read;
+	dimm->buf_len = strlen(dimm_base) + 50;
+
+	dimm->dimm_path = strdup(dimm_base);
+	if (!dimm->dimm_path)
+		goto err_read;
+
+	sprintf(path, "%s/modalias", dimm_base);
+	if (sysfs_read_attr(ctx, path, buf) < 0)
+		goto err_read;
+	dimm->module = to_module(ctx, buf);
+
+	dimm->handle = -1;
+	dimm->phys_id = -1;
+	dimm->serial = -1;
+	dimm->vendor_id = -1;
+	dimm->device_id = -1;
+	dimm->revision_id = -1;
+	dimm->health_eventfd = -1;
+	dimm->dirty_shutdown = -ENOENT;
+	dimm->subsystem_vendor_id = -1;
+	dimm->subsystem_device_id = -1;
+	dimm->subsystem_revision_id = -1;
+	dimm->manufacturing_date = -1;
+	dimm->manufacturing_location = -1;
+	dimm->cmd_family = -1;
+	dimm->nfit_dsm_mask = ULONG_MAX;
+	for (i = 0; i < formats; i++)
+		dimm->format[i] = -1;
+
+	sprintf(path, "%s/flags", dimm_base);
+	if (sysfs_read_attr(ctx, path, buf) < 0) {
+		dimm->locked = -1;
+		dimm->aliased = -1;
+	} else
+		parse_dimm_flags(dimm, buf);
+
+	/* Check if the given dimm supports nfit */
+	if (ndctl_bus_has_nfit(bus)) {
+		dimm->formats = formats;
+		rc = add_nfit_dimm(dimm, dimm_base);
+	}
+
+	if (rc == -ENODEV) {
+		/* Unprobed dimm with no family */
+		rc = 0;
+		goto out;
+	}
+
+	/* Assign dimm-ops based on command family */
+	if (dimm->cmd_family == NVDIMM_FAMILY_INTEL)
+		dimm->ops = intel_dimm_ops;
+	if (dimm->cmd_family == NVDIMM_FAMILY_HPE1)
+		dimm->ops = hpe1_dimm_ops;
+	if (dimm->cmd_family == NVDIMM_FAMILY_MSFT)
+		dimm->ops = msft_dimm_ops;
+	if (dimm->cmd_family == NVDIMM_FAMILY_HYPERV)
+		dimm->ops = hyperv_dimm_ops;
  out:
+	if (rc) {
+		err(ctx, "Unable to probe dimm:%d. Err:%d\n", id, rc);
+		goto err_read;
+	}
+
 	list_add(&bus->dimms, &dimm->list);
 	free(path);
 
-- 
2.25.3
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