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PCI/sysfs: Convert "rom" to static attribute

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The "rom" sysfs attribute allows access to the PCI Option ROM.  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 "rom" to a static attribute and use the .is_bin_visible() callback
to set the correct object size based on the ROM size.

Remove "rom_attr" from the struct pci_dev since it is no longer needed.

This attribute was added in the pre-git era by https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/drivers/pci/pci-sysfs.c?id=f6d553444da2

[bhelgaas: commit log]
Suggested-by: Oliver O'Halloran <oohall@gmail.com>
Link: https://lore.kernel.org/r/20210416205856.3234481-3-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 20:58:38 +00:00 committed by Bjorn Helgaas
parent e1d3f3268b
commit 527139d738
2 changed files with 29 additions and 39 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

67
drivers/pci/pci-sysfs.c
View file

@ -1306,6 +1306,33 @@ static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
return count;
}
static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
static struct bin_attribute *pci_dev_rom_attrs[] = {
&bin_attr_rom,
NULL,
};
static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
struct bin_attribute *a, int n)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
size_t rom_size;
/* If the device has a ROM, try to expose it in sysfs. */
rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
if (!rom_size)
return 0;
a->size = rom_size;
return a->attr.mode;
}
static const struct attribute_group pci_dev_rom_attr_group = {
.bin_attrs = pci_dev_rom_attrs,
.is_bin_visible = pci_dev_rom_attr_is_visible,
};
static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
@ -1352,8 +1379,6 @@ static int pci_create_capabilities_sysfs(struct pci_dev *dev)
int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
{
int retval;
int rom_size;
struct bin_attribute *attr;
if (!sysfs_initialized)
return -EACCES;
@ -1362,43 +1387,15 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
if (retval)
goto err;
/* If the device has a ROM, try to expose it in sysfs. */
rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
if (rom_size) {
attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
if (!attr) {
retval = -ENOMEM;
goto err_resource_files;
}
sysfs_bin_attr_init(attr);
attr->size = rom_size;
attr->attr.name = "rom";
attr->attr.mode = 0600;
attr->read = pci_read_rom;
attr->write = pci_write_rom;
retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
if (retval) {
kfree(attr);
goto err_resource_files;
}
pdev->rom_attr = attr;
}
/* add sysfs entries for various capabilities */
retval = pci_create_capabilities_sysfs(pdev);
if (retval)
goto err_rom_file;
goto err_resource_files;
pci_create_firmware_label_files(pdev);
return 0;
err_rom_file:
if (pdev->rom_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
kfree(pdev->rom_attr);
pdev->rom_attr = NULL;
}
err_resource_files:
pci_remove_resource_files(pdev);
err:
@ -1427,13 +1424,6 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
pci_remove_capabilities_sysfs(pdev);
pci_remove_resource_files(pdev);
if (pdev->rom_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
kfree(pdev->rom_attr);
pdev->rom_attr = NULL;
}
pci_remove_firmware_label_files(pdev);
}
@ -1526,6 +1516,7 @@ static const struct attribute_group pci_dev_group = {
const struct attribute_group *pci_dev_groups[] = {
&pci_dev_group,
&pci_dev_config_attr_group,
&pci_dev_rom_attr_group,
NULL,
};

1
include/linux/pci.h
View file

@ -458,7 +458,6 @@ struct pci_dev {
u32 saved_config_space[16]; /* Config space saved at suspend time */
struct hlist_head saved_cap_space;
struct bin_attribute *rom_attr; /* Attribute descriptor for sysfs ROM entry */
int rom_attr_enabled; /* Display of ROM attribute enabled? */
struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */