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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Daniel Vetter](/assets/img/avatar_default.png)
Since 3234ac664a
("/dev/mem: Revoke mappings when a driver claims
the region") /dev/kmem zaps PTEs when the kernel requests exclusive
acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is
the default for all driver uses.
Except there are two more ways to access PCI BARs: sysfs and proc mmap
support. Let's plug that hole.
For revoke_devmem() to work we need to link our vma into the same
address_space, with consistent vma->vm_pgoff. ->pgoff is already
adjusted, because that's how (io_)remap_pfn_range works, but for the
mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is
to adjust this at at ->open time:
- for sysfs this is easy, now that binary attributes support this. We
just set bin_attr->mapping when mmap is supported
- for procfs it's a bit more tricky, since procfs PCI access has only
one file per device, and access to a specific resource first needs
to be set up with some ioctl calls. But mmap is only supported for
the same resources as sysfs exposes with mmap support, and otherwise
rejected, so we can set the mapping unconditionally at open time
without harm.
A special consideration is for arch_can_pci_mmap_io() - we need to
make sure that the ->f_mapping doesn't alias between ioport and iomem
space. There are only 2 ways in-tree to support mmap of ioports: generic
PCI mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single
architecture hand-rolling. Both approaches support ioport mmap through a
special PFN range and not through magic PTE attributes. Aliasing is
therefore not a problem.
The only difference in access checks left is that sysfs PCI mmap does
not check for CAP_RAWIO. I'm not really sure whether that should be
added or not.
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Kees Cook <keescook@chromium.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-mm@kvack.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-media@vger.kernel.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210204165831.2703772-3-daniel.vetter@ffwll.ch
1585 lines
39 KiB
C
1585 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#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/export.h>
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#include <linux/topology.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/capability.h>
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#include <linux/security.h>
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#include <linux/slab.h>
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#include <linux/vgaarb.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.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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static DEVICE_ATTR_RO(field)
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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(revision, "0x%02x\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 (kstrtoul(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 DEVICE_ATTR_RW(broken_parity_status);
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static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
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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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#ifdef CONFIG_NUMA
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mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
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cpumask_of_node(dev_to_node(dev));
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#else
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mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
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#endif
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return cpumap_print_to_pagebuf(list, buf, mask);
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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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return pci_dev_show_local_cpu(dev, false, attr, buf);
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}
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static DEVICE_ATTR_RO(local_cpus);
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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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return pci_dev_show_local_cpu(dev, true, attr, buf);
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}
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static DEVICE_ATTR_RO(local_cpulist);
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/*
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* PCI Bus Class Devices
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*/
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static ssize_t cpuaffinity_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 *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
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return cpumap_print_to_pagebuf(false, buf, cpumask);
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}
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static DEVICE_ATTR_RO(cpuaffinity);
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static ssize_t cpulistaffinity_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 *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
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return cpumap_print_to_pagebuf(true, buf, cpumask);
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}
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static DEVICE_ATTR_RO(cpulistaffinity);
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static ssize_t power_state_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 = to_pci_dev(dev);
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return sprintf(buf, "%s\n", pci_power_name(pdev->current_state));
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}
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static DEVICE_ATTR_RO(power_state);
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/* show resources */
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static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
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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 DEVICE_ATTR_RO(resource);
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static ssize_t max_link_speed_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 = to_pci_dev(dev);
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return sprintf(buf, "%s\n",
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pci_speed_string(pcie_get_speed_cap(pdev)));
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}
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static DEVICE_ATTR_RO(max_link_speed);
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static ssize_t max_link_width_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 = to_pci_dev(dev);
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return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
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}
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static DEVICE_ATTR_RO(max_link_width);
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static ssize_t current_link_speed_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 *pci_dev = to_pci_dev(dev);
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u16 linkstat;
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int err;
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enum pci_bus_speed speed;
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err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
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if (err)
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return -EINVAL;
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speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
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return sprintf(buf, "%s\n", pci_speed_string(speed));
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}
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static DEVICE_ATTR_RO(current_link_speed);
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static ssize_t current_link_width_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 *pci_dev = to_pci_dev(dev);
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u16 linkstat;
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int err;
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err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
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if (err)
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return -EINVAL;
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return sprintf(buf, "%u\n",
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(linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
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}
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static DEVICE_ATTR_RO(current_link_width);
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static ssize_t secondary_bus_number_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 *pci_dev = to_pci_dev(dev);
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u8 sec_bus;
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int err;
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err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
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if (err)
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return -EINVAL;
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return sprintf(buf, "%u\n", sec_bus);
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}
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static DEVICE_ATTR_RO(secondary_bus_number);
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static ssize_t subordinate_bus_number_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 *pci_dev = to_pci_dev(dev);
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u8 sub_bus;
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int err;
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err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
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if (err)
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return -EINVAL;
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return sprintf(buf, "%u\n", sub_bus);
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}
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static DEVICE_ATTR_RO(subordinate_bus_number);
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static ssize_t ari_enabled_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 *pci_dev = to_pci_dev(dev);
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return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
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}
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static DEVICE_ATTR_RO(ari_enabled);
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
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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 DEVICE_ATTR_RO(modalias);
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static ssize_t enable_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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ssize_t result = kstrtoul(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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device_lock(dev);
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if (dev->driver)
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result = -EBUSY;
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else if (val)
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result = pci_enable_device(pdev);
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else if (pci_is_enabled(pdev))
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pci_disable_device(pdev);
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else
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result = -EIO;
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device_unlock(dev);
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return result < 0 ? result : count;
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}
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static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
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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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static DEVICE_ATTR_RW(enable);
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#ifdef CONFIG_NUMA
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static ssize_t numa_node_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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int node, ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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ret = kstrtoint(buf, 0, &node);
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if (ret)
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return ret;
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if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
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return -EINVAL;
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if (node != NUMA_NO_NODE && !node_online(node))
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return -EINVAL;
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add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
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pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
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node);
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dev->numa_node = node;
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return count;
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}
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static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
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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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static DEVICE_ATTR_RW(numa_node);
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#endif
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static ssize_t dma_mask_bits_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 = to_pci_dev(dev);
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return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
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}
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static DEVICE_ATTR_RO(dma_mask_bits);
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static ssize_t consistent_dma_mask_bits_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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return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
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}
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static DEVICE_ATTR_RO(consistent_dma_mask_bits);
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static ssize_t msi_bus_show(struct device *dev, 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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struct pci_bus *subordinate = pdev->subordinate;
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return sprintf(buf, "%u\n", subordinate ?
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!(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
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: !pdev->no_msi);
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}
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static ssize_t 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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struct pci_bus *subordinate = pdev->subordinate;
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unsigned long val;
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if (kstrtoul(buf, 0, &val) < 0)
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return -EINVAL;
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|
|
if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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|
|
/*
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* "no_msi" and "bus_flags" only affect what happens when a driver
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* requests MSI or MSI-X. They don't affect any drivers that have
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* already requested MSI or MSI-X.
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*/
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if (!subordinate) {
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pdev->no_msi = !val;
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pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
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val ? "allowed" : "disallowed");
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return count;
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}
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|
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if (val)
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subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
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else
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subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
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dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
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val ? "allowed" : "disallowed");
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return count;
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}
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|
static DEVICE_ATTR_RW(msi_bus);
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|
|
|
static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
|
|
{
|
|
unsigned long val;
|
|
struct pci_bus *b = NULL;
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|
|
|
if (kstrtoul(buf, 0, &val) < 0)
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return -EINVAL;
|
|
|
|
if (val) {
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pci_lock_rescan_remove();
|
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while ((b = pci_find_next_bus(b)) != NULL)
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pci_rescan_bus(b);
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pci_unlock_rescan_remove();
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|
}
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|
return count;
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|
}
|
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static BUS_ATTR_WO(rescan);
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|
|
|
static struct attribute *pci_bus_attrs[] = {
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&bus_attr_rescan.attr,
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|
NULL,
|
|
};
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|
|
|
static const struct attribute_group pci_bus_group = {
|
|
.attrs = pci_bus_attrs,
|
|
};
|
|
|
|
const struct attribute_group *pci_bus_groups[] = {
|
|
&pci_bus_group,
|
|
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 (kstrtoul(buf, 0, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
if (val) {
|
|
pci_lock_rescan_remove();
|
|
pci_rescan_bus(pdev->bus);
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
return count;
|
|
}
|
|
static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
|
|
dev_rescan_store);
|
|
|
|
static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 0, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
if (val && device_remove_file_self(dev, attr))
|
|
pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
|
|
remove_store);
|
|
|
|
static ssize_t 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 (kstrtoul(buf, 0, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
if (val) {
|
|
pci_lock_rescan_remove();
|
|
if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
|
|
pci_rescan_bus_bridge_resize(bus->self);
|
|
else
|
|
pci_rescan_bus(bus);
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
return count;
|
|
}
|
|
static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
|
|
bus_rescan_store);
|
|
|
|
#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
|
|
static ssize_t d3cold_allowed_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 (kstrtoul(buf, 0, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
pdev->d3cold_allowed = !!val;
|
|
if (pdev->d3cold_allowed)
|
|
pci_d3cold_enable(pdev);
|
|
else
|
|
pci_d3cold_disable(pdev);
|
|
|
|
pm_runtime_resume(dev);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t d3cold_allowed_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
return sprintf(buf, "%u\n", pdev->d3cold_allowed);
|
|
}
|
|
static DEVICE_ATTR_RW(d3cold_allowed);
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static ssize_t devspec_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct device_node *np = pci_device_to_OF_node(pdev);
|
|
|
|
if (np == NULL)
|
|
return 0;
|
|
return sprintf(buf, "%pOF", np);
|
|
}
|
|
static DEVICE_ATTR_RO(devspec);
|
|
#endif
|
|
|
|
static ssize_t driver_override_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
char *driver_override, *old, *cp;
|
|
|
|
/* We need to keep extra room for a newline */
|
|
if (count >= (PAGE_SIZE - 1))
|
|
return -EINVAL;
|
|
|
|
driver_override = kstrndup(buf, count, GFP_KERNEL);
|
|
if (!driver_override)
|
|
return -ENOMEM;
|
|
|
|
cp = strchr(driver_override, '\n');
|
|
if (cp)
|
|
*cp = '\0';
|
|
|
|
device_lock(dev);
|
|
old = pdev->driver_override;
|
|
if (strlen(driver_override)) {
|
|
pdev->driver_override = driver_override;
|
|
} else {
|
|
kfree(driver_override);
|
|
pdev->driver_override = NULL;
|
|
}
|
|
device_unlock(dev);
|
|
|
|
kfree(old);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t driver_override_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
ssize_t len;
|
|
|
|
device_lock(dev);
|
|
len = scnprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
|
|
device_unlock(dev);
|
|
return len;
|
|
}
|
|
static DEVICE_ATTR_RW(driver_override);
|
|
|
|
static struct attribute *pci_dev_attrs[] = {
|
|
&dev_attr_power_state.attr,
|
|
&dev_attr_resource.attr,
|
|
&dev_attr_vendor.attr,
|
|
&dev_attr_device.attr,
|
|
&dev_attr_subsystem_vendor.attr,
|
|
&dev_attr_subsystem_device.attr,
|
|
&dev_attr_revision.attr,
|
|
&dev_attr_class.attr,
|
|
&dev_attr_irq.attr,
|
|
&dev_attr_local_cpus.attr,
|
|
&dev_attr_local_cpulist.attr,
|
|
&dev_attr_modalias.attr,
|
|
#ifdef CONFIG_NUMA
|
|
&dev_attr_numa_node.attr,
|
|
#endif
|
|
&dev_attr_dma_mask_bits.attr,
|
|
&dev_attr_consistent_dma_mask_bits.attr,
|
|
&dev_attr_enable.attr,
|
|
&dev_attr_broken_parity_status.attr,
|
|
&dev_attr_msi_bus.attr,
|
|
#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
|
|
&dev_attr_d3cold_allowed.attr,
|
|
#endif
|
|
#ifdef CONFIG_OF
|
|
&dev_attr_devspec.attr,
|
|
#endif
|
|
&dev_attr_driver_override.attr,
|
|
&dev_attr_ari_enabled.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute *pci_bridge_attrs[] = {
|
|
&dev_attr_subordinate_bus_number.attr,
|
|
&dev_attr_secondary_bus_number.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute *pcie_dev_attrs[] = {
|
|
&dev_attr_current_link_speed.attr,
|
|
&dev_attr_current_link_width.attr,
|
|
&dev_attr_max_link_width.attr,
|
|
&dev_attr_max_link_speed.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute *pcibus_attrs[] = {
|
|
&dev_attr_bus_rescan.attr,
|
|
&dev_attr_cpuaffinity.attr,
|
|
&dev_attr_cpulistaffinity.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group pcibus_group = {
|
|
.attrs = pcibus_attrs,
|
|
};
|
|
|
|
const struct attribute_group *pcibus_groups[] = {
|
|
&pcibus_group,
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct pci_dev *vga_dev = vga_default_device();
|
|
|
|
if (vga_dev)
|
|
return sprintf(buf, "%u\n", (pdev == vga_dev));
|
|
|
|
return sprintf(buf, "%u\n",
|
|
!!(pdev->resource[PCI_ROM_RESOURCE].flags &
|
|
IORESOURCE_ROM_SHADOW));
|
|
}
|
|
static DEVICE_ATTR_RO(boot_vga);
|
|
|
|
static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
|
|
unsigned int size = 64;
|
|
loff_t init_off = off;
|
|
u8 *data = (u8 *) buf;
|
|
|
|
/* Several chips lock up trying to read undefined config space */
|
|
if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
|
|
size = dev->cfg_size;
|
|
else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
|
|
size = 128;
|
|
|
|
if (off > size)
|
|
return 0;
|
|
if (off + count > size) {
|
|
size -= off;
|
|
count = size;
|
|
} else {
|
|
size = count;
|
|
}
|
|
|
|
pci_config_pm_runtime_get(dev);
|
|
|
|
if ((off & 1) && size) {
|
|
u8 val;
|
|
pci_user_read_config_byte(dev, off, &val);
|
|
data[off - init_off] = val;
|
|
off++;
|
|
size--;
|
|
}
|
|
|
|
if ((off & 3) && size > 2) {
|
|
u16 val;
|
|
pci_user_read_config_word(dev, off, &val);
|
|
data[off - init_off] = val & 0xff;
|
|
data[off - init_off + 1] = (val >> 8) & 0xff;
|
|
off += 2;
|
|
size -= 2;
|
|
}
|
|
|
|
while (size > 3) {
|
|
u32 val;
|
|
pci_user_read_config_dword(dev, off, &val);
|
|
data[off - init_off] = val & 0xff;
|
|
data[off - init_off + 1] = (val >> 8) & 0xff;
|
|
data[off - init_off + 2] = (val >> 16) & 0xff;
|
|
data[off - init_off + 3] = (val >> 24) & 0xff;
|
|
off += 4;
|
|
size -= 4;
|
|
cond_resched();
|
|
}
|
|
|
|
if (size >= 2) {
|
|
u16 val;
|
|
pci_user_read_config_word(dev, off, &val);
|
|
data[off - init_off] = val & 0xff;
|
|
data[off - init_off + 1] = (val >> 8) & 0xff;
|
|
off += 2;
|
|
size -= 2;
|
|
}
|
|
|
|
if (size > 0) {
|
|
u8 val;
|
|
pci_user_read_config_byte(dev, off, &val);
|
|
data[off - init_off] = val;
|
|
off++;
|
|
--size;
|
|
}
|
|
|
|
pci_config_pm_runtime_put(dev);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
|
|
unsigned int size = count;
|
|
loff_t init_off = off;
|
|
u8 *data = (u8 *) buf;
|
|
int ret;
|
|
|
|
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (off > dev->cfg_size)
|
|
return 0;
|
|
if (off + count > dev->cfg_size) {
|
|
size = dev->cfg_size - off;
|
|
count = size;
|
|
}
|
|
|
|
pci_config_pm_runtime_get(dev);
|
|
|
|
if ((off & 1) && size) {
|
|
pci_user_write_config_byte(dev, off, data[off - init_off]);
|
|
off++;
|
|
size--;
|
|
}
|
|
|
|
if ((off & 3) && size > 2) {
|
|
u16 val = data[off - init_off];
|
|
val |= (u16) data[off - init_off + 1] << 8;
|
|
pci_user_write_config_word(dev, off, val);
|
|
off += 2;
|
|
size -= 2;
|
|
}
|
|
|
|
while (size > 3) {
|
|
u32 val = data[off - init_off];
|
|
val |= (u32) data[off - init_off + 1] << 8;
|
|
val |= (u32) data[off - init_off + 2] << 16;
|
|
val |= (u32) data[off - init_off + 3] << 24;
|
|
pci_user_write_config_dword(dev, off, val);
|
|
off += 4;
|
|
size -= 4;
|
|
}
|
|
|
|
if (size >= 2) {
|
|
u16 val = data[off - init_off];
|
|
val |= (u16) data[off - init_off + 1] << 8;
|
|
pci_user_write_config_word(dev, off, val);
|
|
off += 2;
|
|
size -= 2;
|
|
}
|
|
|
|
if (size) {
|
|
pci_user_write_config_byte(dev, off, data[off - init_off]);
|
|
off++;
|
|
--size;
|
|
}
|
|
|
|
pci_config_pm_runtime_put(dev);
|
|
|
|
return count;
|
|
}
|
|
|
|
#ifdef HAVE_PCI_LEGACY
|
|
/**
|
|
* pci_read_legacy_io - read byte(s) from legacy I/O port space
|
|
* @filp: open sysfs file
|
|
* @kobj: kobject corresponding to file to read from
|
|
* @bin_attr: struct bin_attribute for this file
|
|
* @buf: buffer to store results
|
|
* @off: offset into legacy I/O port space
|
|
* @count: number of bytes to read
|
|
*
|
|
* Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
|
|
* callback routine (pci_legacy_read).
|
|
*/
|
|
static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
|
|
|
|
/* Only support 1, 2 or 4 byte accesses */
|
|
if (count != 1 && count != 2 && count != 4)
|
|
return -EINVAL;
|
|
|
|
return pci_legacy_read(bus, off, (u32 *)buf, count);
|
|
}
|
|
|
|
/**
|
|
* pci_write_legacy_io - write byte(s) to legacy I/O port space
|
|
* @filp: open sysfs file
|
|
* @kobj: kobject corresponding to file to read from
|
|
* @bin_attr: struct bin_attribute for this file
|
|
* @buf: buffer containing value to be written
|
|
* @off: offset into legacy I/O port space
|
|
* @count: number of bytes to write
|
|
*
|
|
* Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
|
|
* callback routine (pci_legacy_write).
|
|
*/
|
|
static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
|
|
|
|
/* Only support 1, 2 or 4 byte accesses */
|
|
if (count != 1 && count != 2 && count != 4)
|
|
return -EINVAL;
|
|
|
|
return pci_legacy_write(bus, off, *(u32 *)buf, count);
|
|
}
|
|
|
|
/**
|
|
* pci_mmap_legacy_mem - map legacy PCI memory into user memory space
|
|
* @filp: open sysfs file
|
|
* @kobj: kobject corresponding to device to be mapped
|
|
* @attr: struct bin_attribute for this file
|
|
* @vma: struct vm_area_struct passed to mmap
|
|
*
|
|
* Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
|
|
* legacy memory space (first meg of bus space) into application virtual
|
|
* memory space.
|
|
*/
|
|
static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
|
|
|
|
return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
|
|
}
|
|
|
|
/**
|
|
* pci_mmap_legacy_io - map legacy PCI IO into user memory space
|
|
* @filp: open sysfs file
|
|
* @kobj: kobject corresponding to device to be mapped
|
|
* @attr: struct bin_attribute for this file
|
|
* @vma: struct vm_area_struct passed to mmap
|
|
*
|
|
* Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
|
|
* legacy IO space (first meg of bus space) into application virtual
|
|
* memory space. Returns -ENOSYS if the operation isn't supported
|
|
*/
|
|
static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
|
|
|
|
return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
|
|
}
|
|
|
|
/**
|
|
* pci_adjust_legacy_attr - adjustment of legacy file attributes
|
|
* @b: bus to create files under
|
|
* @mmap_type: I/O port or memory
|
|
*
|
|
* Stub implementation. Can be overridden by arch if necessary.
|
|
*/
|
|
void __weak pci_adjust_legacy_attr(struct pci_bus *b,
|
|
enum pci_mmap_state mmap_type)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* pci_create_legacy_files - create legacy I/O port and memory files
|
|
* @b: bus to create files under
|
|
*
|
|
* Some platforms allow access to legacy I/O port and ISA memory space on
|
|
* a per-bus basis. This routine creates the files and ties them into
|
|
* their associated read, write and mmap files from pci-sysfs.c
|
|
*
|
|
* On error unwind, but don't propagate the error to the caller
|
|
* as it is ok to set up the PCI bus without these files.
|
|
*/
|
|
void pci_create_legacy_files(struct pci_bus *b)
|
|
{
|
|
int error;
|
|
|
|
if (!sysfs_initialized)
|
|
return;
|
|
|
|
b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
|
|
GFP_ATOMIC);
|
|
if (!b->legacy_io)
|
|
goto kzalloc_err;
|
|
|
|
sysfs_bin_attr_init(b->legacy_io);
|
|
b->legacy_io->attr.name = "legacy_io";
|
|
b->legacy_io->size = 0xffff;
|
|
b->legacy_io->attr.mode = 0600;
|
|
b->legacy_io->read = pci_read_legacy_io;
|
|
b->legacy_io->write = pci_write_legacy_io;
|
|
b->legacy_io->mmap = pci_mmap_legacy_io;
|
|
b->legacy_io->mapping = iomem_get_mapping();
|
|
pci_adjust_legacy_attr(b, pci_mmap_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;
|
|
sysfs_bin_attr_init(b->legacy_mem);
|
|
b->legacy_mem->attr.name = "legacy_mem";
|
|
b->legacy_mem->size = 1024*1024;
|
|
b->legacy_mem->attr.mode = 0600;
|
|
b->legacy_mem->mmap = pci_mmap_legacy_mem;
|
|
b->legacy_io->mapping = iomem_get_mapping();
|
|
pci_adjust_legacy_attr(b, pci_mmap_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:
|
|
dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
|
|
}
|
|
|
|
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 */
|
|
|
|
#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
|
|
|
|
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
|
|
enum pci_mmap_api mmap_api)
|
|
{
|
|
unsigned long nr, start, size;
|
|
resource_size_t pci_start = 0, pci_end;
|
|
|
|
if (pci_resource_len(pdev, resno) == 0)
|
|
return 0;
|
|
nr = vma_pages(vma);
|
|
start = vma->vm_pgoff;
|
|
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
|
|
if (mmap_api == PCI_MMAP_PROCFS) {
|
|
pci_resource_to_user(pdev, resno, &pdev->resource[resno],
|
|
&pci_start, &pci_end);
|
|
pci_start >>= PAGE_SHIFT;
|
|
}
|
|
if (start >= pci_start && start < pci_start + size &&
|
|
start + nr <= pci_start + size)
|
|
return 1;
|
|
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(kobj_to_dev(kobj));
|
|
int bar = (unsigned long)attr->private;
|
|
enum pci_mmap_state mmap_type;
|
|
struct resource *res = &pdev->resource[bar];
|
|
int ret;
|
|
|
|
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
|
|
return -EINVAL;
|
|
|
|
if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
|
|
return -EINVAL;
|
|
|
|
mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
|
|
|
|
return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
|
|
}
|
|
|
|
static int pci_mmap_resource_uc(struct file *filp, 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 file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return pci_mmap_resource(kobj, attr, vma, 1);
|
|
}
|
|
|
|
static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf,
|
|
loff_t off, size_t count, bool write)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
|
|
int bar = (unsigned long)attr->private;
|
|
unsigned long port = off;
|
|
|
|
port += pci_resource_start(pdev, bar);
|
|
|
|
if (port > pci_resource_end(pdev, bar))
|
|
return 0;
|
|
|
|
if (port + count - 1 > pci_resource_end(pdev, bar))
|
|
return -EINVAL;
|
|
|
|
switch (count) {
|
|
case 1:
|
|
if (write)
|
|
outb(*(u8 *)buf, port);
|
|
else
|
|
*(u8 *)buf = inb(port);
|
|
return 1;
|
|
case 2:
|
|
if (write)
|
|
outw(*(u16 *)buf, port);
|
|
else
|
|
*(u16 *)buf = inw(port);
|
|
return 2;
|
|
case 4:
|
|
if (write)
|
|
outl(*(u32 *)buf, port);
|
|
else
|
|
*(u32 *)buf = inl(port);
|
|
return 4;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
return pci_resource_io(filp, kobj, attr, buf, off, count, false);
|
|
}
|
|
|
|
static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
int ret;
|
|
|
|
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return pci_resource_io(filp, kobj, attr, buf, off, count, true);
|
|
}
|
|
|
|
/**
|
|
* pci_remove_resource_files - cleanup resource files
|
|
* @pdev: dev to cleanup
|
|
*
|
|
* If we created resource files for @pdev, 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_STD_NUM_BARS; 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;
|
|
char *res_attr_name;
|
|
int retval;
|
|
|
|
res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
|
|
if (!res_attr)
|
|
return -ENOMEM;
|
|
|
|
res_attr_name = (char *)(res_attr + 1);
|
|
|
|
sysfs_bin_attr_init(res_attr);
|
|
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);
|
|
if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
|
|
res_attr->read = pci_read_resource_io;
|
|
res_attr->write = pci_write_resource_io;
|
|
if (arch_can_pci_mmap_io())
|
|
res_attr->mmap = pci_mmap_resource_uc;
|
|
} else {
|
|
res_attr->mmap = pci_mmap_resource_uc;
|
|
}
|
|
}
|
|
if (res_attr->mmap)
|
|
res_attr->mapping = iomem_get_mapping();
|
|
res_attr->attr.name = res_attr_name;
|
|
res_attr->attr.mode = 0600;
|
|
res_attr->size = pci_resource_len(pdev, num);
|
|
res_attr->private = (void *)(unsigned long)num;
|
|
retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
|
|
if (retval)
|
|
kfree(res_attr);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* pci_create_resource_files - create resource files in sysfs for @dev
|
|
* @pdev: dev in question
|
|
*
|
|
* Walk the resources in @pdev 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_STD_NUM_BARS; 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 && arch_can_pci_mmap_wc() &&
|
|
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 /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
|
|
int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
|
|
void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
|
|
#endif
|
|
|
|
/**
|
|
* pci_write_rom - used to enable access to the PCI ROM display
|
|
* @filp: sysfs file
|
|
* @kobj: kernel object handle
|
|
* @bin_attr: struct bin_attribute for this file
|
|
* @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 file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(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
|
|
* @filp: sysfs file
|
|
* @kobj: kernel object handle
|
|
* @bin_attr: struct bin_attribute for this file
|
|
* @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 file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(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 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)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
unsigned long val;
|
|
ssize_t result = kstrtoul(buf, 0, &val);
|
|
|
|
if (result < 0)
|
|
return result;
|
|
|
|
if (val != 1)
|
|
return -EINVAL;
|
|
|
|
pm_runtime_get_sync(dev);
|
|
result = pci_reset_function(pdev);
|
|
pm_runtime_put(dev);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(reset, 0200, NULL, reset_store);
|
|
|
|
static int pci_create_capabilities_sysfs(struct pci_dev *dev)
|
|
{
|
|
int retval;
|
|
|
|
pcie_vpd_create_sysfs_dev_files(dev);
|
|
|
|
if (dev->reset_fn) {
|
|
retval = device_create_file(&dev->dev, &dev_attr_reset);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
return 0;
|
|
|
|
error:
|
|
pcie_vpd_remove_sysfs_dev_files(dev);
|
|
return retval;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
/* 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;
|
|
|
|
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_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;
|
|
}
|
|
|
|
static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
|
|
{
|
|
pcie_vpd_remove_sysfs_dev_files(dev);
|
|
if (dev->reset_fn) {
|
|
device_remove_file(&dev->dev, &dev_attr_reset);
|
|
dev->reset_fn = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
if (!sysfs_initialized)
|
|
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) {
|
|
sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
|
|
kfree(pdev->rom_attr);
|
|
pdev->rom_attr = NULL;
|
|
}
|
|
|
|
pci_remove_firmware_label_files(pdev);
|
|
}
|
|
|
|
static int __init pci_sysfs_init(void)
|
|
{
|
|
struct pci_dev *pdev = NULL;
|
|
struct pci_bus *pbus = 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;
|
|
}
|
|
}
|
|
|
|
while ((pbus = pci_find_next_bus(pbus)))
|
|
pci_create_legacy_files(pbus);
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(pci_sysfs_init);
|
|
|
|
static struct attribute *pci_dev_dev_attrs[] = {
|
|
&dev_attr_boot_vga.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
if (a == &dev_attr_boot_vga.attr)
|
|
if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
|
|
return 0;
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
static struct attribute *pci_dev_hp_attrs[] = {
|
|
&dev_attr_remove.attr,
|
|
&dev_attr_dev_rescan.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
if (pdev->is_virtfn)
|
|
return 0;
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
if (pci_is_bridge(pdev))
|
|
return a->mode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
if (pci_is_pcie(pdev))
|
|
return a->mode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct attribute_group pci_dev_group = {
|
|
.attrs = pci_dev_attrs,
|
|
};
|
|
|
|
const struct attribute_group *pci_dev_groups[] = {
|
|
&pci_dev_group,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group pci_dev_hp_attr_group = {
|
|
.attrs = pci_dev_hp_attrs,
|
|
.is_visible = pci_dev_hp_attrs_are_visible,
|
|
};
|
|
|
|
static const struct attribute_group pci_dev_attr_group = {
|
|
.attrs = pci_dev_dev_attrs,
|
|
.is_visible = pci_dev_attrs_are_visible,
|
|
};
|
|
|
|
static const struct attribute_group pci_bridge_attr_group = {
|
|
.attrs = pci_bridge_attrs,
|
|
.is_visible = pci_bridge_attrs_are_visible,
|
|
};
|
|
|
|
static const struct attribute_group pcie_dev_attr_group = {
|
|
.attrs = pcie_dev_attrs,
|
|
.is_visible = pcie_dev_attrs_are_visible,
|
|
};
|
|
|
|
static const struct attribute_group *pci_dev_attr_groups[] = {
|
|
&pci_dev_attr_group,
|
|
&pci_dev_hp_attr_group,
|
|
#ifdef CONFIG_PCI_IOV
|
|
&sriov_dev_attr_group,
|
|
#endif
|
|
&pci_bridge_attr_group,
|
|
&pcie_dev_attr_group,
|
|
#ifdef CONFIG_PCIEAER
|
|
&aer_stats_attr_group,
|
|
#endif
|
|
#ifdef CONFIG_PCIEASPM
|
|
&aspm_ctrl_attr_group,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
const struct device_type pci_dev_type = {
|
|
.groups = pci_dev_attr_groups,
|
|
};
|