1 files changed, 195 insertions, 65 deletions

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 9c718583a237..110022d78689 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -16,6 +16,7 @@
 
 
 #include <linux/kernel.h>
+#include <linux/sched.h>
 #include <linux/pci.h>
 #include <linux/stat.h>
 #include <linux/topology.h>
@@ -422,7 +423,7 @@ pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
  * callback routine (pci_legacy_read).
  */
-ssize_t
+static ssize_t
 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
                    char *buf, loff_t off, size_t count)
 {
@@ -447,7 +448,7 @@ pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
  * callback routine (pci_legacy_write).
  */
-ssize_t
+static ssize_t
 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
                     char *buf, loff_t off, size_t count)
 {
@@ -467,11 +468,11 @@ pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
  * @attr: struct bin_attribute for this file
  * @vma: struct vm_area_struct passed to mmap
  *
- * Uses an arch specific callback, pci_mmap_legacy_page_range, 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.
  */
-int
+static int
 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
                     struct vm_area_struct *vma)
 {
@@ -479,11 +480,109 @@ pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
                                                       struct device,
                                                       kobj));
 
-        return pci_mmap_legacy_page_range(bus, vma);
+        return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
+}
+
+/**
+ * pci_mmap_legacy_io - map legacy PCI IO into user memory space
+ * @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 kobject *kobj, struct bin_attribute *attr,
+                   struct vm_area_struct *vma)
+{
+        struct pci_bus *bus = to_pci_bus(container_of(kobj,
+                                                      struct device,
+                                                      kobj));
+
+        return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
+}
+
+/**
+ * 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 propogate 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;
+
+        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
+
+static 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) >> PAGE_SHIFT;
+        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
@@ -510,6 +609,9 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
         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.
@@ -696,7 +798,7 @@ static struct bin_attribute pci_config_attr = {
                 .name = "config",
                 .mode = S_IRUGO | S_IWUSR,
         },
-        .size = 256,
+        .size = PCI_CFG_SPACE_SIZE,
         .read = pci_read_config,
         .write = pci_write_config,
 };
@@ -706,7 +808,7 @@ static struct bin_attribute pcie_config_attr = {
                 .name = "config",
                 .mode = S_IRUGO | S_IWUSR,
         },
-        .size = 4096,
+        .size = PCI_CFG_SPACE_EXP_SIZE,
         .read = pci_read_config,
         .write = pci_write_config,
 };
@@ -716,86 +818,103 @@ 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 = pci_read_vpd;
+                attr->write = pci_write_vpd;
+                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)
 {
-        struct bin_attribute *attr = NULL;
         int retval;
+        int rom_size = 0;
+        struct bin_attribute *attr;
 
         if (!sysfs_initialized)
                 return -EACCES;
 
-        if (pdev->cfg_size < 4096)
+        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;
 
-        /* If the device has VPD, try to expose it in sysfs. */
-        if (pdev->vpd) {
-                attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
-                if (attr) {
-                        pdev->vpd->attr = attr;
-                        attr->size = pdev->vpd->len;
-                        attr->attr.name = "vpd";
-                        attr->attr.mode = S_IRUSR | S_IWUSR;
-                        attr->read = pci_read_vpd;
-                        attr->write = pci_write_vpd;
-                        retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
-                        if (retval)
-                                goto err_vpd;
-                } else {
-                        retval = -ENOMEM;
-                        goto err_config_file;
-                }
-        }
-
         retval = pci_create_resource_files(pdev);
         if (retval)
-                goto err_vpd_file;
+                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 (pci_resource_len(pdev, PCI_ROM_RESOURCE) ||
-            (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
+        if (rom_size) {
                 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
-                if (attr) {
-                        pdev->rom_attr = attr;
-                        attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
-                        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)
-                                goto err_rom;
-                } else {
+                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 */
-        if (pcibios_add_platform_entries(pdev))
+        retval = pcibios_add_platform_entries(pdev);
+        if (retval)
                 goto err_rom_file;
 
-        pcie_aspm_create_sysfs_dev_files(pdev);
+        /* add sysfs entries for various capabilities */
+        retval = pci_create_capabilities_sysfs(pdev);
+        if (retval)
+                goto err_rom_file;
 
         return 0;
 
 err_rom_file:
-        if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
+        if (rom_size) {
                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
-err_rom:
-        kfree(pdev->rom_attr);
+                kfree(pdev->rom_attr);
+                pdev->rom_attr = NULL;
+        }
 err_resource_files:
         pci_remove_resource_files(pdev);
-err_vpd_file:
-        if (pdev->vpd) {
-                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
-err_vpd:
-                kfree(pdev->vpd->attr);
-        }
 err_config_file:
-        if (pdev->cfg_size < 4096)
+        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);
@@ -803,6 +922,16 @@ 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
@@ -811,27 +940,28 @@ err:
  */
 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 {
+        int rom_size = 0;
+
         if (!sysfs_initialized)
                 return;
 
-        pcie_aspm_remove_sysfs_dev_files(pdev);
+        pci_remove_capabilities_sysfs(pdev);
 
-        if (pdev->vpd) {
-                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
-                kfree(pdev->vpd->attr);
-        }
-        if (pdev->cfg_size < 4096)
+        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)) {
-                if (pdev->rom_attr) {
-                        sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
-                        kfree(pdev->rom_attr);
-                }
+        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);
         }
 }