Patchwork Export SMBIOS provided firmware instance and label to sysfs

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Submitter Narendra K
Date July 10, 2010, 5:14 p.m.
Message ID <20100710171445.GA24568@auslistsprd01.us.dell.com>
Download mbox | patch
Permalink /patch/58491/
State Not Applicable
Delegated to: David Miller
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Comments

Narendra K - July 10, 2010, 5:14 p.m.
Hello,

This post is in continuation of the discussions in the thread
http://marc.info/?l=linux-pci&m=127852633816819&w=3.

The patch has the following changes -

1.The patch would be compiled only if CONFIG_DMI is set
2.The .test method has been changed to use .is_visible which is part of
already existing infrastructure.

Please find the patch with the above changes here -

From: Narendra K <narendra_k@dell.com>
Subject: [PATCH] Export SMBIOS provided firmware instance and label to sysfs

This patch exports SMBIOS provided firmware instance and label
of onboard pci devices to sysfs

Signed-off-by: Jordan Hargrave <jordan_hargrave@dell.com>
Signed-off-by: Narendra K <narendra_k@dell.com>
---
 drivers/firmware/dmi_scan.c |   26 ++++++++
 drivers/pci/Makefile        |    3 +
 drivers/pci/pci-label.c     |  142 +++++++++++++++++++++++++++++++++++++++++++
 drivers/pci/pci-sysfs.c     |    5 ++
 drivers/pci/pci.h           |    9 +++
 include/linux/dmi.h         |    9 +++
 6 files changed, 194 insertions(+), 0 deletions(-)
 create mode 100644 drivers/pci/pci-label.c
Greg KH - July 10, 2010, 5:49 p.m.
On Sat, Jul 10, 2010 at 12:14:45PM -0500, Narendra K wrote:
> +static char smbios_attr[4096];

Interesting size, too bad you don't reference it again:

> +			if (attribute == SMBIOS_ATTR_INSTANCE_SHOW)
> +				return scnprintf(smbios_attr, PAGE_SIZE,
> +						"%d\n", donboard->instance);
> +			else if (attribute == SMBIOS_ATTR_LABEL_SHOW)
> +				return scnprintf(smbios_attr, PAGE_SIZE,
> +						"%s\n", dmi->name);

PAGE_SIZE here?

Which is it (note, some arches PAGE_SIZE is not 4k...)

> +			return strlen(dmi->name);
> +		}
> +	}
> +	return 0;
> +}
> +
> +static ssize_t
> +smbiosname_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> +	ssize_t result;
> +	result = smbios_instance_string_exist(&dev->kobj, &attr->attr,
> +					      SMBIOS_ATTR_LABEL_SHOW);
> +	strncpy(buf, smbios_attr, result);
> +	return result;
> +}
> +
> +static ssize_t
> +smbiosinstance_show(struct device *dev,
> +		    struct device_attribute *attr, char *buf)
> +{
> +	ssize_t result;
> +	result = smbios_instance_string_exist(&dev->kobj, &attr->attr,
> +					      SMBIOS_ATTR_INSTANCE_SHOW);
> +	strncpy(buf, smbios_attr, result);
> +	return result;
> +}
> +
> +static struct device_attribute smbios_attr_label = {
> +	.attr = {.name = "label", .mode = 0444, .owner = THIS_MODULE},
> +	.show = smbiosname_show,
> +};
> +
> +static struct device_attribute smbios_attr_instance = {
> +	.attr = {.name = "index", .mode = 0444, .owner = THIS_MODULE},
> +	.show = smbiosinstance_show,
> +};
> +
> +static struct attribute *smbios_attributes[] = {
> +	&smbios_attr_label.attr,
> +	&smbios_attr_instance.attr,
> +	NULL,
> +};
> +
> +static struct attribute_group smbios_attr_group = {
> +	.attrs = smbios_attributes,
> +	.is_visible = smbios_instance_string_exist,
> +};
> +
> +static int
> +pci_create_smbiosname_file(struct pci_dev *pdev)
> +{
> +	if (smbios_attr_group.is_visible &&

You set .is_visable above, how could it not be set?

> +		smbios_attr_group.is_visible(&pdev->dev.kobj, NULL, 0)) {
> +		if (!sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group))
> +			return 0;

No, sysfs_create_group will call .is_visable, right?  You shouldn't need
to call it yourself or check it, at all.

> +static int
> +pci_remove_smbiosname_file(struct pci_dev *pdev)
> +{
> +	if (smbios_attr_group.is_visible &&
> +		smbios_attr_group.is_visible(&pdev->dev.kobj, NULL, 0)) {
> +		sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
> +		return 0;

Same here, you shouldn't have to check .is_visable.

> +	}
> +	return -1;

Why -1?  Please use a real error value.

thanks,

greg k-h
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Greg KH - July 10, 2010, 5:52 p.m.
On Sat, Jul 10, 2010 at 12:14:45PM -0500, Narendra K wrote:
> +static char smbios_attr[4096];
> +
> +enum smbios_attr_enum {
> +	SMBIOS_ATTR_LABEL_SHOW = 1,
> +	SMBIOS_ATTR_INSTANCE_SHOW,
> +};
> +
> +static mode_t
> +smbios_instance_string_exist(struct kobject *kobj, struct attribute *attr,
> +			     int attribute)
> +{
> +	struct device *dev;
> +	struct pci_dev *pdev;
> +	const struct dmi_device *dmi;
> +	struct dmi_dev_onboard *donboard;
> +	int bus;
> +	int devfn;
> +
> +	dev = container_of(kobj, struct device, kobj);
> +	pdev = to_pci_dev(dev);
> +
> +	bus = pdev->bus->number;
> +	devfn = pdev->devfn;
> +
> +	dmi = NULL;
> +	while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD,
> +				      NULL, dmi)) != NULL) {
> +		donboard = dmi->device_data;
> +		if (donboard && donboard->bus == bus &&
> +					donboard->devfn == devfn) {
> +			if (attribute == SMBIOS_ATTR_INSTANCE_SHOW)
> +				return scnprintf(smbios_attr, PAGE_SIZE,
> +						"%d\n", donboard->instance);
> +			else if (attribute == SMBIOS_ATTR_LABEL_SHOW)
> +				return scnprintf(smbios_attr, PAGE_SIZE,
> +						"%s\n", dmi->name);

Wait, depending on the attribute you are looking at, you are placing the
data in a single buffer?  What happens if userspace opens and reads both
files at once?

Please don't use this function for your show attributes, just properly
copy the correct string into the userspace buffer.  This logic just
complicates things a lot more, right?

thanks,

greg k-h
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Patch

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index d464672..6894ce4 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -277,6 +277,29 @@  static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
 	list_add_tail(&dev->list, &dmi_devices);
 }
 
+static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
+					int devfn, const char *name)
+{
+	struct dmi_dev_onboard *onboard_dev;
+
+	onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
+	if (!onboard_dev) {
+		printk(KERN_ERR "dmi_save_dev_onboard: out of memory.\n");
+		return;
+	}
+	onboard_dev->instance = instance;
+	onboard_dev->segment = segment;
+	onboard_dev->bus = bus;
+	onboard_dev->devfn = devfn;
+
+	strcpy((char *)&onboard_dev[1], name);
+	onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
+	onboard_dev->dev.name = (char *)&onboard_dev[1];
+	onboard_dev->dev.device_data = onboard_dev;
+
+	list_add(&onboard_dev->dev.list, &dmi_devices);
+}
+
 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
 {
 	const u8 *d = (u8*) dm + 5;
@@ -285,6 +308,8 @@  static void __init dmi_save_extended_devices(const struct dmi_header *dm)
 	if ((*d & 0x80) == 0)
 		return;
 
+	dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
+			     dmi_string_nosave(dm, *(d-1)));
 	dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
 }
 
@@ -333,6 +358,7 @@  static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
 		break;
 	case 41:	/* Onboard Devices Extended Information */
 		dmi_save_extended_devices(dm);
+		break;
 	}
 }
 
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 0b51857..dc1aa09 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -55,6 +55,9 @@  obj-$(CONFIG_MICROBLAZE) += setup-bus.o
 #
 obj-$(CONFIG_ACPI)    += pci-acpi.o
 
+# SMBIOS provided firmware instance and labels
+obj-$(CONFIG_DMI)    += pci-label.o
+
 # Cardbus & CompactPCI use setup-bus
 obj-$(CONFIG_HOTPLUG) += setup-bus.o
 
diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
new file mode 100644
index 0000000..d0eb964
--- /dev/null
+++ b/drivers/pci/pci-label.c
@@ -0,0 +1,142 @@ 
+/*
+ * Purpose: Export the firmware instance/index and label associated with
+ * a pci device to sysfs
+ * Copyright (C) 2010 Dell Inc.
+ * by Narendra K <Narendra_K@dell.com>,
+ * Jordan Hargrave <Jordan_Hargrave@dell.com>
+ *
+ * SMBIOS defines type 41 for onboard pci devices. This code retrieves
+ * the instance number and string from the type 41 record and exports
+ * it to sysfs.
+ *
+ * Please see http://linux.dell.com/wiki/index.php/Oss/libnetdevname for more
+ * information.
+ */
+
+#include <linux/dmi.h>
+#include <linux/sysfs.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include "pci.h"
+
+static char smbios_attr[4096];
+
+enum smbios_attr_enum {
+	SMBIOS_ATTR_LABEL_SHOW = 1,
+	SMBIOS_ATTR_INSTANCE_SHOW,
+};
+
+static mode_t
+smbios_instance_string_exist(struct kobject *kobj, struct attribute *attr,
+			     int attribute)
+{
+	struct device *dev;
+	struct pci_dev *pdev;
+	const struct dmi_device *dmi;
+	struct dmi_dev_onboard *donboard;
+	int bus;
+	int devfn;
+
+	dev = container_of(kobj, struct device, kobj);
+	pdev = to_pci_dev(dev);
+
+	bus = pdev->bus->number;
+	devfn = pdev->devfn;
+
+	dmi = NULL;
+	while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD,
+				      NULL, dmi)) != NULL) {
+		donboard = dmi->device_data;
+		if (donboard && donboard->bus == bus &&
+					donboard->devfn == devfn) {
+			if (attribute == SMBIOS_ATTR_INSTANCE_SHOW)
+				return scnprintf(smbios_attr, PAGE_SIZE,
+						"%d\n", donboard->instance);
+			else if (attribute == SMBIOS_ATTR_LABEL_SHOW)
+				return scnprintf(smbios_attr, PAGE_SIZE,
+						"%s\n", dmi->name);
+			return strlen(dmi->name);
+		}
+	}
+	return 0;
+}
+
+static ssize_t
+smbiosname_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	ssize_t result;
+	result = smbios_instance_string_exist(&dev->kobj, &attr->attr,
+					      SMBIOS_ATTR_LABEL_SHOW);
+	strncpy(buf, smbios_attr, result);
+	return result;
+}
+
+static ssize_t
+smbiosinstance_show(struct device *dev,
+		    struct device_attribute *attr, char *buf)
+{
+	ssize_t result;
+	result = smbios_instance_string_exist(&dev->kobj, &attr->attr,
+					      SMBIOS_ATTR_INSTANCE_SHOW);
+	strncpy(buf, smbios_attr, result);
+	return result;
+}
+
+static struct device_attribute smbios_attr_label = {
+	.attr = {.name = "label", .mode = 0444, .owner = THIS_MODULE},
+	.show = smbiosname_show,
+};
+
+static struct device_attribute smbios_attr_instance = {
+	.attr = {.name = "index", .mode = 0444, .owner = THIS_MODULE},
+	.show = smbiosinstance_show,
+};
+
+static struct attribute *smbios_attributes[] = {
+	&smbios_attr_label.attr,
+	&smbios_attr_instance.attr,
+	NULL,
+};
+
+static struct attribute_group smbios_attr_group = {
+	.attrs = smbios_attributes,
+	.is_visible = smbios_instance_string_exist,
+};
+
+static int
+pci_create_smbiosname_file(struct pci_dev *pdev)
+{
+	if (smbios_attr_group.is_visible &&
+		smbios_attr_group.is_visible(&pdev->dev.kobj, NULL, 0)) {
+		if (!sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group))
+			return 0;
+	}
+	return -1;
+}
+
+static int
+pci_remove_smbiosname_file(struct pci_dev *pdev)
+{
+	if (smbios_attr_group.is_visible &&
+		smbios_attr_group.is_visible(&pdev->dev.kobj, NULL, 0)) {
+		sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
+		return 0;
+	}
+	return -1;
+}
+
+int pci_create_firmware_label_files(struct pci_dev *pdev)
+{
+	if (!pci_create_smbiosname_file(pdev))
+		return 0;
+	return -ENODEV;
+}
+
+int pci_remove_firmware_label_files(struct pci_dev *pdev)
+{
+	if (!pci_remove_smbiosname_file(pdev))
+		return 0;
+	return -ENODEV;
+}
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index afd2fbf..01fd799 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1132,6 +1132,8 @@  int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 
 	pci_create_slot_links(pdev);
 
+	pci_create_firmware_label_files(pdev);
+
 	return 0;
 
 err_vga_file:
@@ -1201,6 +1203,9 @@  void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 		sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 		kfree(pdev->rom_attr);
 	}
+
+	pci_remove_firmware_label_files(pdev);
+
 }
 
 static int __init pci_sysfs_init(void)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index f8077b3..089f402 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -11,6 +11,15 @@ 
 extern int pci_uevent(struct device *dev, struct kobj_uevent_env *env);
 extern int pci_create_sysfs_dev_files(struct pci_dev *pdev);
 extern void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
+#ifndef CONFIG_DMI
+static inline int pci_create_firmware_label_files(struct pci_dev *pdev)
+{ return 0; }
+static inline int pci_remove_firmware_label_files(struct pci_dev *pdev)
+{ return 0; }
+#else
+extern int pci_create_firmware_label_files(struct pci_dev *pdev);
+extern int pci_remove_firmware_label_files(struct pci_dev *pdev);
+#endif
 extern void pci_cleanup_rom(struct pci_dev *dev);
 #ifdef HAVE_PCI_MMAP
 extern int pci_mmap_fits(struct pci_dev *pdev, int resno,
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index a8a3e1a..90e087f 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -20,6 +20,7 @@  enum dmi_device_type {
 	DMI_DEV_TYPE_SAS,
 	DMI_DEV_TYPE_IPMI = -1,
 	DMI_DEV_TYPE_OEM_STRING = -2,
+	DMI_DEV_TYPE_DEV_ONBOARD = -3,
 };
 
 struct dmi_header {
@@ -37,6 +38,14 @@  struct dmi_device {
 
 #ifdef CONFIG_DMI
 
+struct dmi_dev_onboard {
+	struct dmi_device dev;
+	int instance;
+	int segment;
+	int bus;
+	int devfn;
+};
+
 extern int dmi_check_system(const struct dmi_system_id *list);
 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list);
 extern const char * dmi_get_system_info(int field);