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pci-sysfs.c

/*
 * arch/alpha/kernel/pci-sysfs.c
 *
 * Copyright (C) 2009 Ivan Kokshaysky
 *
 * Alpha PCI resource files.
 *
 * Loosely based on generic HAVE_PCI_MMAP implementation in
 * drivers/pci/pci-sysfs.c
 */

#include <linux/sched.h>
#include <linux/pci.h>

static int hose_mmap_page_range(struct pci_controller *hose,
                        struct vm_area_struct *vma,
                        enum pci_mmap_state mmap_type, int sparse)
{
      unsigned long base;

      if (mmap_type == pci_mmap_mem)
            base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
      else
            base = sparse ? hose->sparse_io_base : hose->dense_io_base;

      vma->vm_pgoff += base >> PAGE_SHIFT;
      vma->vm_flags |= (VM_IO | VM_RESERVED);

      return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
                          vma->vm_end - vma->vm_start,
                          vma->vm_page_prot);
}

static int __pci_mmap_fits(struct pci_dev *pdev, int num,
                     struct vm_area_struct *vma, int sparse)
{
      unsigned long nr, start, size;
      int shift = sparse ? 5 : 0;

      nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
      start = vma->vm_pgoff;
      size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;

      if (start < size && size - start >= nr)
            return 1;
      WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
            "(size 0x%08lx)\n",
            current->comm, sparse ? " sparse" : "", start, start + nr,
            pci_name(pdev), num, 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
 * @sparse: address space type
 *
 * Use the bus 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 sparse)
{
      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;
      struct pci_bus_region bar;
      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, sparse))
            return -EINVAL;

      if (iomem_is_exclusive(res->start))
            return -EINVAL;

      pcibios_resource_to_bus(pdev, &bar, res);
      vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
      mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;

      return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
}

static int pci_mmap_resource_sparse(struct kobject *kobj,
                            struct bin_attribute *attr,
                            struct vm_area_struct *vma)
{
      return pci_mmap_resource(kobj, attr, vma, 1);
}

static int pci_mmap_resource_dense(struct kobject *kobj,
                           struct bin_attribute *attr,
                           struct vm_area_struct *vma)
{
      return pci_mmap_resource(kobj, attr, vma, 0);
}

/**
 * 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.
 */
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 sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
{
      struct pci_bus_region bar;
      struct pci_controller *hose = pdev->sysdata;
      long dense_offset;
      unsigned long sparse_size;

      pcibios_resource_to_bus(pdev, &bar, &pdev->resource[num]);

      /* All core logic chips have 4G sparse address space, except
         CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
         definitions in asm/core_xxx.h files). This corresponds
         to 128M or 512M of the bus space. */
      dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
      sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;

      return bar.end < sparse_size;
}

static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name,
                         char *suffix, struct bin_attribute *res_attr,
                         unsigned long sparse)
{
      size_t size = pci_resource_len(pdev, num);

      sprintf(name, "resource%d%s", num, suffix);
      res_attr->mmap = sparse ? pci_mmap_resource_sparse :
                          pci_mmap_resource_dense;
      res_attr->attr.name = name;
      res_attr->attr.mode = S_IRUSR | S_IWUSR;
      res_attr->size = sparse ? size << 5 : size;
      res_attr->private = &pdev->resource[num];
      return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
}

static int pci_create_attr(struct pci_dev *pdev, int num)
{
      /* allocate attribute structure, piggyback attribute name */
      int retval, nlen1, nlen2 = 0, res_count = 1;
      unsigned long sparse_base, dense_base;
      struct bin_attribute *attr;
      struct pci_controller *hose = pdev->sysdata;
      char *suffix, *attr_name;

      suffix = "";      /* Assume bwx machine, normal resourceN files. */
      nlen1 = 10;

      if (pdev->resource[num].flags & IORESOURCE_MEM) {
            sparse_base = hose->sparse_mem_base;
            dense_base = hose->dense_mem_base;
            if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
                  sparse_base = 0;
                  suffix = "_dense";
                  nlen1 = 16; /* resourceN_dense */
            }
      } else {
            sparse_base = hose->sparse_io_base;
            dense_base = hose->dense_io_base;
      }

      if (sparse_base) {
            suffix = "_sparse";
            nlen1 = 17;
            if (dense_base) {
                  nlen2 = 16; /* resourceN_dense */
                  res_count = 2;
            }
      }

      attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
      if (!attr)
            return -ENOMEM;

      /* Create bwx, sparse or single dense file */
      attr_name = (char *)(attr + res_count);
      pdev->res_attr[num] = attr;
      retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
                             sparse_base);
      if (retval || res_count == 1)
            return retval;

      /* Create dense file */
      attr_name += nlen1;
      attr++;
      pdev->res_attr_wc[num] = attr;
      return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
}

/**
 * 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.
 */
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);
            if (retval) {
                  pci_remove_resource_files(pdev);
                  return retval;
            }
      }
      return 0;
}

/* Legacy I/O bus mapping stuff. */

static int __legacy_mmap_fits(struct pci_controller *hose,
                        struct vm_area_struct *vma,
                        unsigned long res_size, int sparse)
{
      unsigned long nr, start, size;

      nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
      start = vma->vm_pgoff;
      size = ((res_size - 1) >> PAGE_SHIFT) + 1;

      if (start < size && size - start >= nr)
            return 1;
      WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
            "(size 0x%08lx)\n",
            current->comm, sparse ? " sparse" : "", start, start + nr,
            hose->index, size);
      return 0;
}

static inline int has_sparse(struct pci_controller *hose,
                       enum pci_mmap_state mmap_type)
{
      unsigned long base;

      base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
                                   hose->sparse_io_base;

      return base != 0;
}

int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
                         enum pci_mmap_state mmap_type)
{
      struct pci_controller *hose = bus->sysdata;
      int sparse = has_sparse(hose, mmap_type);
      unsigned long res_size;

      res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
                                     bus->legacy_io->size;
      if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
            return -EINVAL;

      return hose_mmap_page_range(hose, vma, mmap_type, sparse);
}

/**
 * pci_adjust_legacy_attr - adjustment of legacy file attributes
 * @b: bus to create files under
 * @mmap_type: I/O port or memory
 *
 * Adjust file name and size for sparse mappings.
 */
void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
{
      struct pci_controller *hose = bus->sysdata;

      if (!has_sparse(hose, mmap_type))
            return;

      if (mmap_type == pci_mmap_mem) {
            bus->legacy_mem->attr.name = "legacy_mem_sparse";
            bus->legacy_mem->size <<= 5;
      } else {
            bus->legacy_io->attr.name = "legacy_io_sparse";
            bus->legacy_io->size <<= 5;
      }
      return;
}

/* Legacy I/O bus read/write functions */
int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
{
      struct pci_controller *hose = bus->sysdata;

      port += hose->io_space->start;

      switch(size) {
      case 1:
            *((u8 *)val) = inb(port);
            return 1;
      case 2:
            if (port & 1)
                  return -EINVAL;
            *((u16 *)val) = inw(port);
            return 2;
      case 4:
            if (port & 3)
                  return -EINVAL;
            *((u32 *)val) = inl(port);
            return 4;
      }
      return -EINVAL;
}

int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
{
      struct pci_controller *hose = bus->sysdata;

      port += hose->io_space->start;

      switch(size) {
      case 1:
            outb(port, val);
            return 1;
      case 2:
            if (port & 1)
                  return -EINVAL;
            outw(port, val);
            return 2;
      case 4:
            if (port & 3)
                  return -EINVAL;
            outl(port, val);
            return 4;
      }
      return -EINVAL;
}

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