mirror of https://gitee.com/openkylin/linux.git
977 lines
25 KiB
C
977 lines
25 KiB
C
/*
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* drivers/pci/pci-sysfs.c
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*
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* (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
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* (C) Copyright 2002-2004 IBM Corp.
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* (C) Copyright 2003 Matthew Wilcox
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* (C) Copyright 2003 Hewlett-Packard
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* (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
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* (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
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*
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* File attributes for PCI devices
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*
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* Modeled after usb's driverfs.c
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*
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/stat.h>
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#include <linux/topology.h>
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#include <linux/mm.h>
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#include <linux/capability.h>
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#include <linux/pci-aspm.h>
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#include "pci.h"
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static int sysfs_initialized; /* = 0 */
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/* show configuration fields */
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#define pci_config_attr(field, format_string) \
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static ssize_t \
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field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct pci_dev *pdev; \
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\
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pdev = to_pci_dev (dev); \
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return sprintf (buf, format_string, pdev->field); \
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}
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pci_config_attr(vendor, "0x%04x\n");
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pci_config_attr(device, "0x%04x\n");
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pci_config_attr(subsystem_vendor, "0x%04x\n");
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pci_config_attr(subsystem_device, "0x%04x\n");
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pci_config_attr(class, "0x%06x\n");
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pci_config_attr(irq, "%u\n");
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static ssize_t broken_parity_status_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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return sprintf (buf, "%u\n", pdev->broken_parity_status);
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}
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static ssize_t broken_parity_status_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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unsigned long val;
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if (strict_strtoul(buf, 0, &val) < 0)
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return -EINVAL;
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pdev->broken_parity_status = !!val;
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return count;
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}
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static ssize_t local_cpus_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const struct cpumask *mask;
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int len;
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mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
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len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
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buf[len++] = '\n';
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buf[len] = '\0';
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return len;
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}
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static ssize_t local_cpulist_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const struct cpumask *mask;
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int len;
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mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
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len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
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buf[len++] = '\n';
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buf[len] = '\0';
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return len;
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}
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/* show resources */
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static ssize_t
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resource_show(struct device * dev, struct device_attribute *attr, char * buf)
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{
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struct pci_dev * pci_dev = to_pci_dev(dev);
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char * str = buf;
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int i;
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int max;
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resource_size_t start, end;
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if (pci_dev->subordinate)
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max = DEVICE_COUNT_RESOURCE;
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else
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max = PCI_BRIDGE_RESOURCES;
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for (i = 0; i < max; i++) {
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struct resource *res = &pci_dev->resource[i];
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pci_resource_to_user(pci_dev, i, res, &start, &end);
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str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
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(unsigned long long)start,
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(unsigned long long)end,
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(unsigned long long)res->flags);
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}
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return (str - buf);
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}
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
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pci_dev->vendor, pci_dev->device,
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pci_dev->subsystem_vendor, pci_dev->subsystem_device,
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(u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
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(u8)(pci_dev->class));
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}
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static ssize_t is_enabled_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t count)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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unsigned long val;
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ssize_t result = strict_strtoul(buf, 0, &val);
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if (result < 0)
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return result;
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/* this can crash the machine when done on the "wrong" device */
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!val) {
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if (atomic_read(&pdev->enable_cnt) != 0)
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pci_disable_device(pdev);
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else
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result = -EIO;
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} else
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result = pci_enable_device(pdev);
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return result < 0 ? result : count;
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}
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static ssize_t is_enabled_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev;
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pdev = to_pci_dev (dev);
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return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
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}
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#ifdef CONFIG_NUMA
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static ssize_t
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numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf (buf, "%d\n", dev->numa_node);
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}
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#endif
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static ssize_t
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msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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if (!pdev->subordinate)
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return 0;
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return sprintf (buf, "%u\n",
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!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
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}
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static ssize_t
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msi_bus_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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unsigned long val;
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if (strict_strtoul(buf, 0, &val) < 0)
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return -EINVAL;
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/* bad things may happen if the no_msi flag is changed
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* while some drivers are loaded */
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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/* Maybe pci devices without subordinate busses shouldn't even have this
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* attribute in the first place? */
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if (!pdev->subordinate)
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return count;
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/* Is the flag going to change, or keep the value it already had? */
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if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
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!!val) {
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pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
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dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
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" bad things could happen\n", val ? "" : " not");
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}
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return count;
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}
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struct device_attribute pci_dev_attrs[] = {
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__ATTR_RO(resource),
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__ATTR_RO(vendor),
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__ATTR_RO(device),
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__ATTR_RO(subsystem_vendor),
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__ATTR_RO(subsystem_device),
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__ATTR_RO(class),
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__ATTR_RO(irq),
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__ATTR_RO(local_cpus),
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__ATTR_RO(local_cpulist),
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__ATTR_RO(modalias),
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#ifdef CONFIG_NUMA
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__ATTR_RO(numa_node),
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#endif
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__ATTR(enable, 0600, is_enabled_show, is_enabled_store),
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__ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
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broken_parity_status_show,broken_parity_status_store),
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__ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
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__ATTR_NULL,
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};
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static ssize_t
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pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
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unsigned int size = 64;
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loff_t init_off = off;
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u8 *data = (u8*) buf;
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/* Several chips lock up trying to read undefined config space */
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if (capable(CAP_SYS_ADMIN)) {
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size = dev->cfg_size;
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} else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
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size = 128;
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}
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if (off > size)
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return 0;
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if (off + count > size) {
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size -= off;
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count = size;
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} else {
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size = count;
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}
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if ((off & 1) && size) {
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u8 val;
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pci_user_read_config_byte(dev, off, &val);
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data[off - init_off] = val;
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off++;
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size--;
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}
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if ((off & 3) && size > 2) {
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u16 val;
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pci_user_read_config_word(dev, off, &val);
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data[off - init_off] = val & 0xff;
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data[off - init_off + 1] = (val >> 8) & 0xff;
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off += 2;
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size -= 2;
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}
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while (size > 3) {
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u32 val;
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pci_user_read_config_dword(dev, off, &val);
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data[off - init_off] = val & 0xff;
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data[off - init_off + 1] = (val >> 8) & 0xff;
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data[off - init_off + 2] = (val >> 16) & 0xff;
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data[off - init_off + 3] = (val >> 24) & 0xff;
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off += 4;
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size -= 4;
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}
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if (size >= 2) {
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u16 val;
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pci_user_read_config_word(dev, off, &val);
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data[off - init_off] = val & 0xff;
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data[off - init_off + 1] = (val >> 8) & 0xff;
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off += 2;
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size -= 2;
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}
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if (size > 0) {
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u8 val;
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pci_user_read_config_byte(dev, off, &val);
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data[off - init_off] = val;
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off++;
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--size;
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}
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return count;
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}
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static ssize_t
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pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
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unsigned int size = count;
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loff_t init_off = off;
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u8 *data = (u8*) buf;
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if (off > dev->cfg_size)
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return 0;
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if (off + count > dev->cfg_size) {
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size = dev->cfg_size - off;
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count = size;
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}
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if ((off & 1) && size) {
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pci_user_write_config_byte(dev, off, data[off - init_off]);
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off++;
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size--;
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}
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if ((off & 3) && size > 2) {
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u16 val = data[off - init_off];
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val |= (u16) data[off - init_off + 1] << 8;
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pci_user_write_config_word(dev, off, val);
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off += 2;
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size -= 2;
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}
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while (size > 3) {
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u32 val = data[off - init_off];
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val |= (u32) data[off - init_off + 1] << 8;
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val |= (u32) data[off - init_off + 2] << 16;
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val |= (u32) data[off - init_off + 3] << 24;
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pci_user_write_config_dword(dev, off, val);
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off += 4;
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size -= 4;
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}
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if (size >= 2) {
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u16 val = data[off - init_off];
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val |= (u16) data[off - init_off + 1] << 8;
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pci_user_write_config_word(dev, off, val);
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off += 2;
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size -= 2;
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}
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if (size) {
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pci_user_write_config_byte(dev, off, data[off - init_off]);
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off++;
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--size;
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}
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return count;
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}
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static ssize_t
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read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct pci_dev *dev =
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to_pci_dev(container_of(kobj, struct device, kobj));
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if (off > bin_attr->size)
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count = 0;
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else if (count > bin_attr->size - off)
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count = bin_attr->size - off;
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return pci_read_vpd(dev, off, count, buf);
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}
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static ssize_t
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write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct pci_dev *dev =
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to_pci_dev(container_of(kobj, struct device, kobj));
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if (off > bin_attr->size)
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count = 0;
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else if (count > bin_attr->size - off)
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count = bin_attr->size - off;
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return pci_write_vpd(dev, off, count, buf);
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}
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#ifdef HAVE_PCI_LEGACY
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/**
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* pci_read_legacy_io - read byte(s) from legacy I/O port space
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* @kobj: kobject corresponding to file to read from
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* @buf: buffer to store results
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* @off: offset into legacy I/O port space
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* @count: number of bytes to read
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*
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* Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
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* callback routine (pci_legacy_read).
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*/
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static ssize_t
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pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct pci_bus *bus = to_pci_bus(container_of(kobj,
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struct device,
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kobj));
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/* Only support 1, 2 or 4 byte accesses */
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if (count != 1 && count != 2 && count != 4)
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return -EINVAL;
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return pci_legacy_read(bus, off, (u32 *)buf, count);
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}
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/**
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* pci_write_legacy_io - write byte(s) to legacy I/O port space
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* @kobj: kobject corresponding to file to read from
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* @buf: buffer containing value to be written
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* @off: offset into legacy I/O port space
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* @count: number of bytes to write
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*
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* Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
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* callback routine (pci_legacy_write).
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*/
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static ssize_t
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pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct pci_bus *bus = to_pci_bus(container_of(kobj,
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struct device,
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kobj));
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/* Only support 1, 2 or 4 byte accesses */
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if (count != 1 && count != 2 && count != 4)
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return -EINVAL;
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return pci_legacy_write(bus, off, *(u32 *)buf, count);
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}
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/**
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* pci_mmap_legacy_mem - map legacy PCI memory into user memory space
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* @kobj: kobject corresponding to device to be mapped
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* @attr: struct bin_attribute for this file
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* @vma: struct vm_area_struct passed to mmap
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*
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* Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
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* legacy memory space (first meg of bus space) into application virtual
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* memory space.
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*/
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static int
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pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
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struct vm_area_struct *vma)
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{
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struct pci_bus *bus = to_pci_bus(container_of(kobj,
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struct device,
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kobj));
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return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
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}
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/**
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* pci_mmap_legacy_io - map legacy PCI IO into user memory space
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* @kobj: kobject corresponding to device to be mapped
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* @attr: struct bin_attribute for this file
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* @vma: struct vm_area_struct passed to mmap
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*
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* Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
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* legacy IO space (first meg of bus space) into application virtual
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* memory space. Returns -ENOSYS if the operation isn't supported
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*/
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static int
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pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
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struct vm_area_struct *vma)
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{
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struct pci_bus *bus = to_pci_bus(container_of(kobj,
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struct device,
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kobj));
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return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
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}
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/**
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* pci_create_legacy_files - create legacy I/O port and memory files
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* @b: bus to create files under
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*
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* Some platforms allow access to legacy I/O port and ISA memory space on
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* a per-bus basis. This routine creates the files and ties them into
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* their associated read, write and mmap files from pci-sysfs.c
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*
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* On error unwind, but don't propogate the error to the caller
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* as it is ok to set up the PCI bus without these files.
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*/
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void pci_create_legacy_files(struct pci_bus *b)
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|
{
|
|
int error;
|
|
|
|
b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
|
|
GFP_ATOMIC);
|
|
if (!b->legacy_io)
|
|
goto kzalloc_err;
|
|
|
|
b->legacy_io->attr.name = "legacy_io";
|
|
b->legacy_io->size = 0xffff;
|
|
b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
|
|
b->legacy_io->read = pci_read_legacy_io;
|
|
b->legacy_io->write = pci_write_legacy_io;
|
|
b->legacy_io->mmap = pci_mmap_legacy_io;
|
|
error = device_create_bin_file(&b->dev, b->legacy_io);
|
|
if (error)
|
|
goto legacy_io_err;
|
|
|
|
/* Allocated above after the legacy_io struct */
|
|
b->legacy_mem = b->legacy_io + 1;
|
|
b->legacy_mem->attr.name = "legacy_mem";
|
|
b->legacy_mem->size = 1024*1024;
|
|
b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
|
|
b->legacy_mem->mmap = pci_mmap_legacy_mem;
|
|
error = device_create_bin_file(&b->dev, b->legacy_mem);
|
|
if (error)
|
|
goto legacy_mem_err;
|
|
|
|
return;
|
|
|
|
legacy_mem_err:
|
|
device_remove_bin_file(&b->dev, b->legacy_io);
|
|
legacy_io_err:
|
|
kfree(b->legacy_io);
|
|
b->legacy_io = NULL;
|
|
kzalloc_err:
|
|
printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
|
|
"and ISA memory resources to sysfs\n");
|
|
return;
|
|
}
|
|
|
|
void pci_remove_legacy_files(struct pci_bus *b)
|
|
{
|
|
if (b->legacy_io) {
|
|
device_remove_bin_file(&b->dev, b->legacy_io);
|
|
device_remove_bin_file(&b->dev, b->legacy_mem);
|
|
kfree(b->legacy_io); /* both are allocated here */
|
|
}
|
|
}
|
|
#endif /* HAVE_PCI_LEGACY */
|
|
|
|
#ifdef HAVE_PCI_MMAP
|
|
|
|
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
|
|
{
|
|
unsigned long nr, start, size;
|
|
|
|
nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
|
|
start = vma->vm_pgoff;
|
|
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
|
|
if (start < size && size - start >= nr)
|
|
return 1;
|
|
WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
|
|
current->comm, start, start+nr, pci_name(pdev), resno, size);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_mmap_resource - map a PCI resource into user memory space
|
|
* @kobj: kobject for mapping
|
|
* @attr: struct bin_attribute for the file being mapped
|
|
* @vma: struct vm_area_struct passed into the mmap
|
|
* @write_combine: 1 for write_combine mapping
|
|
*
|
|
* Use the regular PCI mapping routines to map a PCI resource into userspace.
|
|
*/
|
|
static int
|
|
pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
|
|
struct vm_area_struct *vma, int write_combine)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(container_of(kobj,
|
|
struct device, kobj));
|
|
struct resource *res = (struct resource *)attr->private;
|
|
enum pci_mmap_state mmap_type;
|
|
resource_size_t start, end;
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_ROM_RESOURCE; i++)
|
|
if (res == &pdev->resource[i])
|
|
break;
|
|
if (i >= PCI_ROM_RESOURCE)
|
|
return -ENODEV;
|
|
|
|
if (!pci_mmap_fits(pdev, i, vma))
|
|
return -EINVAL;
|
|
|
|
/* pci_mmap_page_range() expects the same kind of entry as coming
|
|
* from /proc/bus/pci/ which is a "user visible" value. If this is
|
|
* different from the resource itself, arch will do necessary fixup.
|
|
*/
|
|
pci_resource_to_user(pdev, i, res, &start, &end);
|
|
vma->vm_pgoff += start >> PAGE_SHIFT;
|
|
mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
|
|
|
|
if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
|
|
return -EINVAL;
|
|
|
|
return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
|
|
}
|
|
|
|
static int
|
|
pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return pci_mmap_resource(kobj, attr, vma, 0);
|
|
}
|
|
|
|
static int
|
|
pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return pci_mmap_resource(kobj, attr, vma, 1);
|
|
}
|
|
|
|
/**
|
|
* pci_remove_resource_files - cleanup resource files
|
|
* @dev: dev to cleanup
|
|
*
|
|
* If we created resource files for @dev, remove them from sysfs and
|
|
* free their resources.
|
|
*/
|
|
static void
|
|
pci_remove_resource_files(struct pci_dev *pdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
|
|
struct bin_attribute *res_attr;
|
|
|
|
res_attr = pdev->res_attr[i];
|
|
if (res_attr) {
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
|
|
kfree(res_attr);
|
|
}
|
|
|
|
res_attr = pdev->res_attr_wc[i];
|
|
if (res_attr) {
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
|
|
kfree(res_attr);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
|
|
{
|
|
/* allocate attribute structure, piggyback attribute name */
|
|
int name_len = write_combine ? 13 : 10;
|
|
struct bin_attribute *res_attr;
|
|
int retval;
|
|
|
|
res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
|
|
if (res_attr) {
|
|
char *res_attr_name = (char *)(res_attr + 1);
|
|
|
|
if (write_combine) {
|
|
pdev->res_attr_wc[num] = res_attr;
|
|
sprintf(res_attr_name, "resource%d_wc", num);
|
|
res_attr->mmap = pci_mmap_resource_wc;
|
|
} else {
|
|
pdev->res_attr[num] = res_attr;
|
|
sprintf(res_attr_name, "resource%d", num);
|
|
res_attr->mmap = pci_mmap_resource_uc;
|
|
}
|
|
res_attr->attr.name = res_attr_name;
|
|
res_attr->attr.mode = S_IRUSR | S_IWUSR;
|
|
res_attr->size = pci_resource_len(pdev, num);
|
|
res_attr->private = &pdev->resource[num];
|
|
retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
|
|
} else
|
|
retval = -ENOMEM;
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* pci_create_resource_files - create resource files in sysfs for @dev
|
|
* @dev: dev in question
|
|
*
|
|
* Walk the resources in @dev creating files for each resource available.
|
|
*/
|
|
static int pci_create_resource_files(struct pci_dev *pdev)
|
|
{
|
|
int i;
|
|
int retval;
|
|
|
|
/* Expose the PCI resources from this device as files */
|
|
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
|
|
|
|
/* skip empty resources */
|
|
if (!pci_resource_len(pdev, i))
|
|
continue;
|
|
|
|
retval = pci_create_attr(pdev, i, 0);
|
|
/* for prefetchable resources, create a WC mappable file */
|
|
if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
|
|
retval = pci_create_attr(pdev, i, 1);
|
|
|
|
if (retval) {
|
|
pci_remove_resource_files(pdev);
|
|
return retval;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#else /* !HAVE_PCI_MMAP */
|
|
static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
|
|
static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
|
|
#endif /* HAVE_PCI_MMAP */
|
|
|
|
/**
|
|
* pci_write_rom - used to enable access to the PCI ROM display
|
|
* @kobj: kernel object handle
|
|
* @buf: user input
|
|
* @off: file offset
|
|
* @count: number of byte in input
|
|
*
|
|
* writing anything except 0 enables it
|
|
*/
|
|
static ssize_t
|
|
pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
|
|
|
|
if ((off == 0) && (*buf == '0') && (count == 2))
|
|
pdev->rom_attr_enabled = 0;
|
|
else
|
|
pdev->rom_attr_enabled = 1;
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* pci_read_rom - read a PCI ROM
|
|
* @kobj: kernel object handle
|
|
* @buf: where to put the data we read from the ROM
|
|
* @off: file offset
|
|
* @count: number of bytes to read
|
|
*
|
|
* Put @count bytes starting at @off into @buf from the ROM in the PCI
|
|
* device corresponding to @kobj.
|
|
*/
|
|
static ssize_t
|
|
pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
|
|
void __iomem *rom;
|
|
size_t size;
|
|
|
|
if (!pdev->rom_attr_enabled)
|
|
return -EINVAL;
|
|
|
|
rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
|
|
if (!rom || !size)
|
|
return -EIO;
|
|
|
|
if (off >= size)
|
|
count = 0;
|
|
else {
|
|
if (off + count > size)
|
|
count = size - off;
|
|
|
|
memcpy_fromio(buf, rom + off, count);
|
|
}
|
|
pci_unmap_rom(pdev, rom);
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct bin_attribute pci_config_attr = {
|
|
.attr = {
|
|
.name = "config",
|
|
.mode = S_IRUGO | S_IWUSR,
|
|
},
|
|
.size = PCI_CFG_SPACE_SIZE,
|
|
.read = pci_read_config,
|
|
.write = pci_write_config,
|
|
};
|
|
|
|
static struct bin_attribute pcie_config_attr = {
|
|
.attr = {
|
|
.name = "config",
|
|
.mode = S_IRUGO | S_IWUSR,
|
|
},
|
|
.size = PCI_CFG_SPACE_EXP_SIZE,
|
|
.read = pci_read_config,
|
|
.write = pci_write_config,
|
|
};
|
|
|
|
int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int pci_create_capabilities_sysfs(struct pci_dev *dev)
|
|
{
|
|
int retval;
|
|
struct bin_attribute *attr;
|
|
|
|
/* If the device has VPD, try to expose it in sysfs. */
|
|
if (dev->vpd) {
|
|
attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
|
|
if (!attr)
|
|
return -ENOMEM;
|
|
|
|
attr->size = dev->vpd->len;
|
|
attr->attr.name = "vpd";
|
|
attr->attr.mode = S_IRUSR | S_IWUSR;
|
|
attr->read = read_vpd_attr;
|
|
attr->write = write_vpd_attr;
|
|
retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
|
|
if (retval) {
|
|
kfree(dev->vpd->attr);
|
|
return retval;
|
|
}
|
|
dev->vpd->attr = attr;
|
|
}
|
|
|
|
/* Active State Power Management */
|
|
pcie_aspm_create_sysfs_dev_files(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
|
|
{
|
|
int retval;
|
|
int rom_size = 0;
|
|
struct bin_attribute *attr;
|
|
|
|
if (!sysfs_initialized)
|
|
return -EACCES;
|
|
|
|
if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
|
|
retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
|
|
else
|
|
retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
|
|
if (retval)
|
|
goto err;
|
|
|
|
retval = pci_create_resource_files(pdev);
|
|
if (retval)
|
|
goto err_config_file;
|
|
|
|
if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
|
|
rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
|
|
else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
|
|
rom_size = 0x20000;
|
|
|
|
/* If the device has a ROM, try to expose it in sysfs. */
|
|
if (rom_size) {
|
|
attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
|
|
if (!attr) {
|
|
retval = -ENOMEM;
|
|
goto err_resource_files;
|
|
}
|
|
attr->size = rom_size;
|
|
attr->attr.name = "rom";
|
|
attr->attr.mode = S_IRUSR;
|
|
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 platform-specific attributes */
|
|
retval = pcibios_add_platform_entries(pdev);
|
|
if (retval)
|
|
goto err_rom_file;
|
|
|
|
/* add sysfs entries for various capabilities */
|
|
retval = pci_create_capabilities_sysfs(pdev);
|
|
if (retval)
|
|
goto err_rom_file;
|
|
|
|
return 0;
|
|
|
|
err_rom_file:
|
|
if (rom_size) {
|
|
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_config_file:
|
|
if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
|
|
else
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
|
|
err:
|
|
return retval;
|
|
}
|
|
|
|
static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
|
|
{
|
|
if (dev->vpd && dev->vpd->attr) {
|
|
sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
|
|
kfree(dev->vpd->attr);
|
|
}
|
|
|
|
pcie_aspm_remove_sysfs_dev_files(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
|
|
* @pdev: device whose entries we should free
|
|
*
|
|
* Cleanup when @pdev is removed from sysfs.
|
|
*/
|
|
void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
|
|
{
|
|
int rom_size = 0;
|
|
|
|
if (!sysfs_initialized)
|
|
return;
|
|
|
|
pci_remove_capabilities_sysfs(pdev);
|
|
|
|
if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
|
|
else
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
|
|
|
|
pci_remove_resource_files(pdev);
|
|
|
|
if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
|
|
rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
|
|
else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
|
|
rom_size = 0x20000;
|
|
|
|
if (rom_size && pdev->rom_attr) {
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
|
|
kfree(pdev->rom_attr);
|
|
}
|
|
}
|
|
|
|
static int __init pci_sysfs_init(void)
|
|
{
|
|
struct pci_dev *pdev = NULL;
|
|
int retval;
|
|
|
|
sysfs_initialized = 1;
|
|
for_each_pci_dev(pdev) {
|
|
retval = pci_create_sysfs_dev_files(pdev);
|
|
if (retval) {
|
|
pci_dev_put(pdev);
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(pci_sysfs_init);
|