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PCI/sysfs: Convert "index", "acpi_index", "label" to static attributes 

The "label", "index", and "acpi_index" sysfs attributes show firmware label
information about the device.  If the ACPI Device Name _DSM is implemented
for the device, we have:

  label        Device name (optional, may be null)
  acpi_index   Instance number (unique under \_SB scope)

When there is no ACPI _DSM and SMBIOS provides an Onboard Devices structure
for the device, we have:

  label        Reference Designation, e.g., a silkscreen label
  index        Device Type Instance

Previously these attributes were dynamically created either by
pci_bus_add_device() or the pci_sysfs_init() initcall, but since they don'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 "label", "index", and "acpi_index" to static attributes.

Presence of the ACPI _DSM (device_has_acpi_name()) determines whether the
ACPI information (label, acpi_index) or the SMBIOS information (label,
index) is visible.

[bhelgaas: commit log, split to separate patch, add "pci_dev_" prefix]
Suggested-by: Oliver O'Halloran <oohall@gmail.com>
Link: https://lore.kernel.org/r/20210416205856.3234481-6-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 2021-04-27 10:49:16 -05:00 committed by Bjorn Helgaas
parent 4dd7dfa166
commit 506140f9c0
3 changed files with 16 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/pci/pci-label.c
View File

@ -101,6 +101,9 @@ static umode_t smbios_attr_is_visible(struct kobject *kobj, struct attribute *a,
dev = kobj_to_dev(kobj);
pdev = to_pci_dev(dev);
if (device_has_acpi_name(dev))
return 0;
if (!find_smbios_instance_string(pdev, NULL, SMBIOS_ATTR_NONE))
return 0;
@ -136,29 +139,10 @@ static struct attribute *smbios_attrs[] = {
NULL,
};
static const struct attribute_group smbios_attr_group = {
const struct attribute_group pci_dev_smbios_attr_group = {
.attrs = smbios_attrs,
.is_visible = smbios_attr_is_visible,
};
static int pci_create_smbiosname_file(struct pci_dev *pdev)
{
return sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group);
}
static void pci_remove_smbiosname_file(struct pci_dev *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
}
#else
static inline int pci_create_smbiosname_file(struct pci_dev *pdev)
{
return -1;
}
static inline void pci_remove_smbiosname_file(struct pci_dev *pdev)
{
}
#endif
#ifdef CONFIG_ACPI
@ -253,45 +237,8 @@ static struct attribute *acpi_attrs[] = {
NULL,
};
static const struct attribute_group acpi_attr_group = {
const struct attribute_group pci_dev_acpi_attr_group = {
.attrs = acpi_attrs,
.is_visible = acpi_attr_is_visible,
};
static int pci_create_acpi_index_label_files(struct pci_dev *pdev)
{
return sysfs_create_group(&pdev->dev.kobj, &acpi_attr_group);
}
static int pci_remove_acpi_index_label_files(struct pci_dev *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, &acpi_attr_group);
return 0;
}
#else
static inline int pci_create_acpi_index_label_files(struct pci_dev *pdev)
{
return -1;
}
static inline int pci_remove_acpi_index_label_files(struct pci_dev *pdev)
{
return -1;
}
#endif
void pci_create_firmware_label_files(struct pci_dev *pdev)
{
if (device_has_acpi_name(&pdev->dev))
pci_create_acpi_index_label_files(pdev);
else
pci_create_smbiosname_file(pdev);
}
void pci_remove_firmware_label_files(struct pci_dev *pdev)
{
if (device_has_acpi_name(&pdev->dev))
pci_remove_acpi_index_label_files(pdev);
else
pci_remove_smbiosname_file(pdev);
}

17
drivers/pci/pci-sysfs.c
View File

@ -1380,18 +1380,10 @@ static const struct attribute_group pci_dev_reset_attr_group = {
int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
{
int retval;
if (!sysfs_initialized)
return -EACCES;
retval = pci_create_resource_files(pdev);
if (retval)
return retval;
pci_create_firmware_label_files(pdev);
return 0;
return pci_create_resource_files(pdev);
}
/**
@ -1406,7 +1398,6 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
return;
pci_remove_resource_files(pdev);
pci_remove_firmware_label_files(pdev);
}
static int __init pci_sysfs_init(void)
@ -1501,6 +1492,12 @@ const struct attribute_group *pci_dev_groups[] = {
&pci_dev_rom_attr_group,
&pci_dev_reset_attr_group,
&pci_dev_vpd_attr_group,
#ifdef CONFIG_DMI
&pci_dev_smbios_attr_group,
#endif
#ifdef CONFIG_ACPI
&pci_dev_acpi_attr_group,
#endif
NULL,
};

13
drivers/pci/pci.h
View File

@ -21,16 +21,10 @@ bool pcie_cap_has_rtctl(const struct pci_dev *dev);
int pci_create_sysfs_dev_files(struct pci_dev *pdev);
void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
#if !defined(CONFIG_DMI) && !defined(CONFIG_ACPI)
static inline void pci_create_firmware_label_files(struct pci_dev *pdev)
{ return; }
static inline void pci_remove_firmware_label_files(struct pci_dev *pdev)
{ return; }
#else
void pci_create_firmware_label_files(struct pci_dev *pdev);
void pci_remove_firmware_label_files(struct pci_dev *pdev);
#endif
void pci_cleanup_rom(struct pci_dev *dev);
#ifdef CONFIG_DMI
extern const struct attribute_group pci_dev_smbios_attr_group;
#endif
enum pci_mmap_api {
PCI_MMAP_SYSFS, /* mmap on /sys/bus/pci/devices/<BDF>/resource<N> */
@ -695,6 +689,7 @@ static inline int pci_aer_raw_clear_status(struct pci_dev *dev) { return -EINVAL
#ifdef CONFIG_ACPI
int pci_acpi_program_hp_params(struct pci_dev *dev);
extern const struct attribute_group pci_dev_acpi_attr_group;
#else
static inline int pci_acpi_program_hp_params(struct pci_dev *dev)
{