drivers/pci/pci-sysfs.c



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/*
 * drivers/pci/pci-sysfs.c
 *
 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
 * (C) Copyright 2002-2004 IBM Corp.
 * (C) Copyright 2003 Matthew Wilcox
 * (C) Copyright 2003 Hewlett-Packard
 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
 *
 * File attributes for PCI devices
 *
 * Modeled after usb's driverfs.c 
 *
 */


#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/topology.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/capability.h>
#include <linux/security.h>
#include <linux/pci-aspm.h>
#include <linux/slab.h>
#include "pci.h"

static int sysfs_initialized;	/* = 0 */

/* show configuration fields */
#define pci_config_attr(field, format_string)				\
static ssize_t								\
field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
{									\
	struct pci_dev *pdev;						\
									\
	pdev = to_pci_dev (dev);					\
	return sprintf (buf, format_string, pdev->field);		\
}

pci_config_attr(vendor, "0x%04x\n");
pci_config_attr(device, "0x%04x\n");
pci_config_attr(subsystem_vendor, "0x%04x\n");
pci_config_attr(subsystem_device, "0x%04x\n");
pci_config_attr(class, "0x%06x\n");
pci_config_attr(irq, "%u\n");

static ssize_t broken_parity_status_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	return sprintf (buf, "%u\n", pdev->broken_parity_status);
}

static ssize_t broken_parity_status_store(struct device *dev,
					  struct device_attribute *attr,
					  const char *buf, size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	unsigned long val;

	if (strict_strtoul(buf, 0, &val) < 0)
		return -EINVAL;

	pdev->broken_parity_status = !!val;

	return count;
}

static ssize_t local_cpus_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{		
	const struct cpumask *mask;
	int len;

#ifdef CONFIG_NUMA
	mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
					  cpumask_of_node(dev_to_node(dev));
#else
	mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
#endif
	len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
	buf[len++] = '\n';
	buf[len] = '\0';
	return len;
}


static ssize_t local_cpulist_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	const struct cpumask *mask;
	int len;

#ifdef CONFIG_NUMA
	mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
					  cpumask_of_node(dev_to_node(dev));
#else
	mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
#endif
	len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
	buf[len++] = '\n';
	buf[len] = '\0';
	return len;
}

/*
 * PCI Bus Class Devices
 */
static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
					int type,
					struct device_attribute *attr,
					char *buf)
{
	int ret;
	const struct cpumask *cpumask;

	cpumask = cpumask_of_pcibus(to_pci_bus(dev));
	ret = type ?
		cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
		cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
	buf[ret++] = '\n';
	buf[ret] = '\0';
	return ret;
}

static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
}

static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
}

/* show resources */
static ssize_t
resource_show(struct device * dev, struct device_attribute *attr, char * buf)
{
	struct pci_dev * pci_dev = to_pci_dev(dev);
	char * str = buf;
	int i;
	int max;
	resource_size_t start, end;

	if (pci_dev->subordinate)
		max = DEVICE_COUNT_RESOURCE;
	else
		max = PCI_BRIDGE_RESOURCES;

	for (i = 0; i < max; i++) {
		struct resource *res =  &pci_dev->resource[i];
		pci_resource_to_user(pci_dev, i, res, &start, &end);
		str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
			       (unsigned long long)start,
			       (unsigned long long)end,
			       (unsigned long long)res->flags);
	}
	return (str - buf);
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);

	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
		       pci_dev->vendor, pci_dev->device,
		       pci_dev->subsystem_vendor, pci_dev->subsystem_device,
		       (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
		       (u8)(pci_dev->class));
}

static ssize_t is_enabled_store(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	unsigned long val;
	ssize_t result = strict_strtoul(buf, 0, &val);

	if (result < 0)
		return result;

	/* this can crash the machine when done on the "wrong" device */
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (!val) {
		if (pci_is_enabled(pdev))
			pci_disable_device(pdev);
		else
			result = -EIO;
	} else
		result = pci_enable_device(pdev);

	return result < 0 ? result : count;
}

static ssize_t is_enabled_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev;

	pdev = to_pci_dev (dev);
	return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
}

#ifdef CONFIG_NUMA
static ssize_t
numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return sprintf (buf, "%d\n", dev->numa_node);
}
#endif

static ssize_t
dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
}

static ssize_t
consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
				 char *buf)
{
	return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
}

static ssize_t
msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	if (!pdev->subordinate)
		return 0;

	return sprintf (buf, "%u\n",
			!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
}

static ssize_t
msi_bus_store(struct device *dev, struct device_attribute *attr,
	      const char *buf, size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	unsigned long val;

	if (strict_strtoul(buf, 0, &val) < 0)
		return -EINVAL;

	/* bad things may happen if the no_msi flag is changed
	 * while some drivers are loaded */
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	/* Maybe pci devices without subordinate busses shouldn't even have this
	 * attribute in the first place?  */
	if (!pdev->subordinate)
		return count;

	/* Is the flag going to change, or keep the value it already had? */
	if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
	    !!val) {
		pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;

		dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
			 " bad things could happen\n", val ? "" : " not");
	}

	return count;
}

#ifdef CONFIG_HOTPLUG
static DEFINE_MUTEX(pci_remove_rescan_mutex);
static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
				size_t count)
{
	unsigned long val;
	struct pci_bus *b = NULL;

	if (strict_strtoul(buf, 0, &val) < 0)
		return -EINVAL;

	if (val) {
		mutex_lock(&pci_remove_rescan_mutex);
		while ((b = pci_find_next_bus(b)) != NULL)
			pci_rescan_bus(b);
		mutex_unlock(&pci_remove_rescan_mutex);
	}
	return count;
}

struct bus_attribute pci_bus_attrs[] = {
	__ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
	__ATTR_NULL
};

static ssize_t
dev_rescan_store(struct device *dev, struct device_attribute *attr,
		 const char *buf, size_t count)
{
	unsigned long val;
	struct pci_dev *pdev = to_pci_dev(dev);

	if (strict_strtoul(buf, 0, &val) < 0)
		return -EINVAL;

	if (val) {
		mutex_lock(&pci_remove_rescan_mutex);
		pci_rescan_bus(pdev->bus);
		mutex_unlock(&pci_remove_rescan_mutex);
	}
	return count;
}

static void remove_callback(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	mutex_lock(&pci_remove_rescan_mutex);
	pci_remove_bus_device(pdev);
	mutex_unlock(&pci_remove_rescan_mutex);
}

static ssize_t
remove_store(struct device *dev, struct device_attribute *dummy,
	     const char *buf, size_t count)
{
	int ret = 0;
	unsigned long val;

	if (strict_strtoul(buf, 0, &val) < 0)
		return -EINVAL;

	/* An attribute cannot be unregistered by one of its own methods,
	 * so we have to use this roundabout approach.
	 */
	if (val)
		ret = device_schedule_callback(dev, remove_callback);
	if (ret)
		count = ret;
	return count;
}

static ssize_t
dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
		 const char *buf, size_t count)
{
	unsigned long val;
	struct pci_bus *bus = to_pci_bus(dev);

	if (strict_strtoul(buf, 0, &val) < 0)
		return -EINVAL;

	if (val) {
		mutex_lock(&pci_remove_rescan_mutex);
		pci_rescan_bus(bus);
		mutex_unlock(&pci_remove_rescan_mutex);
	}
	return count;
}

#endif

struct device_attribute pci_dev_attrs[] = {
	__ATTR_RO(resource),
	__ATTR_RO(vendor),
	__ATTR_RO(device),
	__ATTR_RO(subsystem_vendor),
	__ATTR_RO(subsystem_device),
	__ATTR_RO(class),
	__ATTR_RO(irq),
	__ATTR_RO(local_cpus),
	__ATTR_RO(local_cpulist),
	__ATTR_RO(modalias),
#ifdef CONFIG_NUMA
	__ATTR_RO(numa_node),
#endif
	__ATTR_RO(dma_mask_bits),
	__ATTR_RO(consistent_dma_mask_bits),
	__ATTR(enable, 0600, is_enabled_show, is_enabled_store),
	__ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
		broken_parity_status_show,broken_parity_status_store),
	__ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
#ifdef CONFIG_HOTPLUG
	__ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
	__ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
#endif
	__ATTR_NULL,
};

struct device_attribute pcibus_dev_attrs[] = {
#ifdef CONFIG_HOTPLUG
	__ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
#endif
	__ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
	__ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
	__ATTR_NULL,
};

static ssize_t
boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	return sprintf(buf, "%u\n",
		!!(pdev->resource[PCI_ROM_RESOURCE].flags &
		   IORESOURCE_ROM_SHADOW));
}
struct device_attribute vga_attr = __ATTR_RO(boot_vga);

static ssize_t
pci_read_config(struct file *filp, struct kobject *kobj,
		struct bin_attribute *bin_attr,