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Subject[PATCH v3 25/27] powerpc/powernv/pmem: Expose the serial number in sysfs
Date
From: Alastair D'Silva <alastair@d-silva.org>

This information will be used by ndctl in userspace to help users identify
the device.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
arch/powerpc/platforms/powernv/pmem/Makefile | 2 +-
arch/powerpc/platforms/powernv/pmem/ocxl.c | 5 +++
.../platforms/powernv/pmem/ocxl_internal.h | 6 +++
.../platforms/powernv/pmem/ocxl_sysfs.c | 37 +++++++++++++++++++
4 files changed, 49 insertions(+), 1 deletion(-)
create mode 100644 arch/powerpc/platforms/powernv/pmem/ocxl_sysfs.c

diff --git a/arch/powerpc/platforms/powernv/pmem/Makefile b/arch/powerpc/platforms/powernv/pmem/Makefile
index 4ceda25907d4..d02870806f30 100644
--- a/arch/powerpc/platforms/powernv/pmem/Makefile
+++ b/arch/powerpc/platforms/powernv/pmem/Makefile
@@ -4,4 +4,4 @@ ccflags-$(CONFIG_PPC_WERROR) += -Werror

obj-$(CONFIG_OCXL_PMEM) += ocxlpmem.o

-ocxlpmem-y := ocxl.o ocxl_internal.o
+ocxlpmem-y := ocxl.o ocxl_internal.o ocxl_sysfs.o
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c
index 5cd1b6d78dd6..ec73713d05ad 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
@@ -1878,6 +1878,11 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto err;
}

+ if (ocxlpmem_sysfs_add(ocxlpmem)) {
+ dev_err(&pdev->dev, "Could not create sysfs entries\n");
+ goto err;
+ }
+
elapsed = 0;
timeout = ocxlpmem->readiness_timeout + ocxlpmem->memory_available_timeout;
while (!is_usable(ocxlpmem, false)) {
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
index 0eb7a35d24ae..12304ceace61 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
@@ -246,3 +246,9 @@ int ns_response_handled(const struct ocxlpmem *ocxlpmem);
*/
void warn_status(const struct ocxlpmem *ocxlpmem, const char *message,
u8 status);
+
+/**
+ * ocxlpmem_sysfs_add() - Create sysfs entries for an OpenCAPI persistent memory device
+ * @ocxlpmem: the device metadata
+ */
+int ocxlpmem_sysfs_add(struct ocxlpmem *ocxlpmem);
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_sysfs.c b/arch/powerpc/platforms/powernv/pmem/ocxl_sysfs.c
new file mode 100644
index 000000000000..7829e4bc887d
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl_sysfs.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2018 IBM Corp.
+
+#include <linux/sysfs.h>
+#include <linux/capability.h>
+#include <linux/limits.h>
+#include <linux/firmware.h>
+#include "ocxl_internal.h"
+
+static ssize_t serial_show(struct device *device, struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxlpmem *ocxlpmem = container_of(device, struct ocxlpmem, dev);
+ const struct ocxl_fn_config *fn_config = ocxl_function_config(ocxlpmem->ocxl_fn);
+
+ return scnprintf(buf, PAGE_SIZE, "%llu\n", fn_config->serial);
+}
+
+static struct device_attribute attrs[] = {
+ __ATTR_RO(serial),
+};
+
+int ocxlpmem_sysfs_add(struct ocxlpmem *ocxlpmem)
+{
+ int i, rc;
+
+ for (i = 0; i < ARRAY_SIZE(attrs); i++) {
+ rc = device_create_file(&ocxlpmem->dev, &attrs[i]);
+ if (rc) {
+ for (; --i >= 0;)
+ device_remove_file(&ocxlpmem->dev, &attrs[i]);
+
+ return rc;
+ }
+ }
+ return 0;
+}
--
2.24.1
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