linux-kernel - [PATCH v4 24/25] nvdimm/ocxl: Expose the serial number & firmware version in sysfs

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Date:   Fri, 27 Mar 2020 18:12:01 +1100
From:   "Alastair D'Silva" <alastair@...ilva.org>
To:     alastair@...ilva.org
Cc:     "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kurz <groug@...d.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: [PATCH v4 24/25] nvdimm/ocxl: Expose the serial number & firmware version in sysfs

This patch exposes the serial number & firmware version in sysfs,
which will be used by ndctl in userspace to help users identify
the device.

Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
---
 drivers/nvdimm/ocxl/main.c | 42 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/drivers/nvdimm/ocxl/main.c b/drivers/nvdimm/ocxl/main.c
index 92b4389e8cbb..1f422f0d51ef 100644
--- a/drivers/nvdimm/ocxl/main.c
+++ b/drivers/nvdimm/ocxl/main.c
@@ -235,6 +235,43 @@ static int reserve_metadata(struct ocxlpmem *ocxlpmem,
 	return 0;
 }
 
+static ssize_t serial_show(struct device *device, struct device_attribute *attr,
+			   char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(device);
+	struct ocxlpmem *ocxlpmem = nvdimm_provider_data(nvdimm);
+	const struct ocxl_fn_config *fn_config = ocxl_function_config(ocxlpmem->ocxl_fn);
+
+	return scnprintf(buf, PAGE_SIZE, "%llu\n", fn_config->serial);
+}
+static DEVICE_ATTR_RO(serial);
+
+static ssize_t fw_version_show(struct device *device,
+			       struct device_attribute *attr, char *buf)
+{
+	struct nvdimm *nvdimm = to_nvdimm(device);
+	struct ocxlpmem *ocxlpmem = nvdimm_provider_data(nvdimm);
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", ocxlpmem->fw_version);
+}
+static DEVICE_ATTR_RO(fw_version);
+
+static struct attribute *ocxl_pmem_attrs[] = {
+	&dev_attr_serial.attr,
+	&dev_attr_fw_version.attr,
+	NULL,
+};
+
+static const struct attribute_group ocxl_pmem_attribute_group = {
+	.name = "ocxlpmem",
+	.attrs = ocxl_pmem_attrs,
+};
+
+static const struct attribute_group *ocxl_pmem_dimm_attribute_groups[] = {
+	&ocxl_pmem_attribute_group,
+	NULL,
+};
+
 /**
  * register_lpc_mem() - Discover persistent memory on a device and register it with the NVDIMM subsystem
  * @ocxlpmem: the device metadata
@@ -291,8 +328,9 @@ static int register_lpc_mem(struct ocxlpmem *ocxlpmem)
 
 	snprintf(serial, sizeof(serial), "%llx", fn_config->serial);
 	nd_mapping_desc.nvdimm = nvdimm_create(ocxlpmem->nvdimm_bus, ocxlpmem,
-					       NULL, nvdimm_flags,
-					       nvdimm_cmd_mask, 0, NULL);
+					       ocxl_pmem_dimm_attribute_groups,
+					       nvdimm_flags, nvdimm_cmd_mask, 0,
+					       NULL);
 	if (!nd_mapping_desc.nvdimm)
 		return -ENOMEM;
 
-- 
2.24.1