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PCI/sysfs: Convert "config" to static attribute

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The "config" sysfs attribute allows access to either the legacy (PCI and
PCI-X Mode 1) or the extended (PCI-X Mode 2 and PCIe) device configuration
space.  Previously it was dynamically created either when a device was
added (for hot-added devices) or via a late_initcall (for devices present
at boot):

  pci_bus_add_devices
    pci_bus_add_device
      pci_create_sysfs_dev_files
        if (!sysfs_initialized)
	  return
	sysfs_create_bin_file           # for hot-added devices

  pci_sysfs_init                        # late_initcall
    sysfs_initialized = 1
    for_each_pci_dev(pdev)
      pci_create_sysfs_dev_files(pdev)  # for devices present at boot

And dynamically removed when the PCI device is stopped and removed:

  pci_stop_bus_device
    pci_stop_dev
      pci_remove_sysfs_dev_files
        sysfs_remove_bin_file

This attribute does not need to be created or removed dynamically, so we
can use a static attribute so the device model takes care of addition and
removal automatically.

Convert "config" to a static attribute and use the .is_bin_visible()
callback to set the correct object size (either 256 bytes or 4 KiB) at
runtime.

The pci_sysfs_init() scheme 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/CAOSf1CHss03DBSDO4PmTtMp0tCEu5kScn704ZEwLKGXQzBfqaA@mail.gmail.com
Link: https://lore.kernel.org/r/20210416205856.3234481-2-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 20:58:37 +00:00 committed by Bjorn Helgaas
parent a38fd87484
commit e1d3f3268b
1 changed files with 25 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
drivers/pci/pci-sysfs.c
View File

@ -808,6 +808,29 @@ static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
return count;
}
static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
static struct bin_attribute *pci_dev_config_attrs[] = {
&bin_attr_config,
NULL,
};
static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
struct bin_attribute *a, int n)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
a->size = PCI_CFG_SPACE_SIZE;
if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
a->size = PCI_CFG_SPACE_EXP_SIZE;
return a->attr.mode;
}
static const struct attribute_group pci_dev_config_attr_group = {
.bin_attrs = pci_dev_config_attrs,
.is_bin_visible = pci_dev_config_attr_is_visible,
};
#ifdef HAVE_PCI_LEGACY
/**
@ -1284,26 +1307,6 @@ static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
return count;
}
static const struct bin_attribute pci_config_attr = {
.attr = {
.name = "config",
.mode = 0644,
},
.size = PCI_CFG_SPACE_SIZE,
.read = pci_read_config,
.write = pci_write_config,
};
static const struct bin_attribute pcie_config_attr = {
.attr = {
.name = "config",
.mode = 0644,
},
.size = PCI_CFG_SPACE_EXP_SIZE,
.read = pci_read_config,
.write = pci_write_config,
};
static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@ -1355,16 +1358,9 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
if (!sysfs_initialized)
return -EACCES;
if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
else
retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
if (retval)
goto err;
retval = pci_create_resource_files(pdev);
if (retval)
goto err_config_file;
goto err;
/* If the device has a ROM, try to expose it in sysfs. */
rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
@ -1405,11 +1401,6 @@ err_rom_file:
}
err_resource_files:
pci_remove_resource_files(pdev);
err_config_file:
if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
else
sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
err:
return retval;
}
@ -1435,12 +1426,6 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
return;
pci_remove_capabilities_sysfs(pdev);
if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
else
sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
pci_remove_resource_files(pdev);
if (pdev->rom_attr) {
@ -1540,6 +1525,7 @@ static const struct attribute_group pci_dev_group = {
const struct attribute_group *pci_dev_groups[] = {
&pci_dev_group,
&pci_dev_config_attr_group,
NULL,
};