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PCI/sysfs: Convert "vpd" to static attribute

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The "vpd" sysfs attribute allows access to Vital Product Data (VPD).
Previously it was dynamically created either by pci_bus_add_device() or the
pci_sysfs_init() initcall, but since it doesn't need to be created or
removed dynamically, we can use a static attribute so the device model
takes care of addition and removal automatically.

Convert "vpd" to a static attribute and use the .is_bin_visible() callback
to check whether the device supports VPD.

Remove pcie_vpd_create_sysfs_dev_files(),
pcie_vpd_remove_sysfs_dev_files(), pci_create_capabilities_sysfs(), and
pci_create_capabilities_sysfs(), which are no longer needed.

[bhelgaas: This is substantially the same as the earlier patch from Heiner
Kallweit <hkallweit1@gmail.com>.  I included Krzysztof's change here so all
the "convert to static attribute" changes are together.]

[bhelgaas: rename to vpd_read()/vpd_write() and pci_dev_vpd_attr_group]
Suggested-by: Oliver O'Halloran <oohall@gmail.com>
Based-on: https://lore.kernel.org/r/7703024f-8882-9eec-a122-599871728a89@gmail.com
Based-on-patch-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/20210416205856.3234481-5-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Krzysztof Wilczyński 2021-04-16 20:58:40 +00:00 committed by Bjorn Helgaas
parent 07b4523e9e
commit d93f839905
3 changed files with 18 additions and 46 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
drivers/pci/pci-sysfs.c
View file

@ -1378,12 +1378,6 @@ static const struct attribute_group pci_dev_reset_attr_group = {
.is_visible = pci_dev_reset_attr_is_visible,
};
static void pci_create_capabilities_sysfs(struct pci_dev *dev)
{
pcie_vpd_create_sysfs_dev_files(dev);
}
int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
{
int retval;
@ -1395,18 +1389,11 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
if (retval)
return retval;
/* add sysfs entries for various capabilities */
pci_create_capabilities_sysfs(pdev);
pci_create_firmware_label_files(pdev);
return 0;
}
static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
{
pcie_vpd_remove_sysfs_dev_files(dev);
}
/**
* pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
* @pdev: device whose entries we should free
@ -1418,7 +1405,6 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
if (!sysfs_initialized)
return;
pci_remove_capabilities_sysfs(pdev);
pci_remove_resource_files(pdev);
pci_remove_firmware_label_files(pdev);
}
@ -1514,6 +1500,7 @@ const struct attribute_group *pci_dev_groups[] = {
&pci_dev_config_attr_group,
&pci_dev_rom_attr_group,
&pci_dev_reset_attr_group,
&pci_dev_vpd_attr_group,
NULL,
};

3
drivers/pci/pci.h
View file

@ -143,8 +143,7 @@ static inline bool pcie_downstream_port(const struct pci_dev *dev)
int pci_vpd_init(struct pci_dev *dev);
void pci_vpd_release(struct pci_dev *dev);
void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev);
void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev);
extern const struct attribute_group pci_dev_vpd_attr_group;
/* PCI Virtual Channel */
int pci_save_vc_state(struct pci_dev *dev);

46
drivers/pci/vpd.c
View file

@ -21,7 +21,6 @@ struct pci_vpd_ops {
struct pci_vpd {
const struct pci_vpd_ops *ops;
struct bin_attribute *attr; /* Descriptor for sysfs VPD entry */
struct mutex lock;
unsigned int len;
u16 flag;
@ -428,41 +427,28 @@ static ssize_t vpd_write(struct file *filp, struct kobject *kobj,
return pci_write_vpd(dev, off, count, buf);
}
static BIN_ATTR(vpd, 0600, vpd_read, vpd_write, 0);
void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev)
static struct bin_attribute *vpd_attrs[] = {
&bin_attr_vpd,
NULL,
};
static umode_t vpd_attr_is_visible(struct kobject *kobj,
struct bin_attribute *a, int n)
{
int retval;
struct bin_attribute *attr;
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
if (!dev->vpd)
return;
if (!pdev->vpd)
return 0;
attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
if (!attr)
return;
sysfs_bin_attr_init(attr);
attr->size = 0;
attr->attr.name = "vpd";
attr->attr.mode = S_IRUSR | S_IWUSR;
attr->read = vpd_read;
attr->write = vpd_write;
retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
if (retval) {
kfree(attr);
return;
}
dev->vpd->attr = attr;
return a->attr.mode;
}
void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev)
{
if (dev->vpd && dev->vpd->attr) {
sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
kfree(dev->vpd->attr);
}
}
const struct attribute_group pci_dev_vpd_attr_group = {
.bin_attrs = vpd_attrs,
.is_bin_visible = vpd_attr_is_visible,
};
int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
{