New interfaces exported for uc and wc accesses. Apps has to change to use
these new interfaces.
Signed-off-by: Venkatesh Pallipadi <[EMAIL PROTECTED]>
Signed-off-by: Suresh Siddha <[EMAIL PROTECTED]>
Index: linux-2.6.git/drivers/pci/pci-sysfs.c
===================================================================
--- linux-2.6.git.orig/drivers/pci/pci-sysfs.c 2008-01-08 10:53:10.000000000
-0800
+++ linux-2.6.git/drivers/pci/pci-sysfs.c 2008-01-08 12:51:22.000000000
-0800
@@ -426,7 +426,7 @@
*/
static int
pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
- struct vm_area_struct *vma)
+ struct vm_area_struct *vma, int write_combine)
{
struct pci_dev *pdev = to_pci_dev(container_of(kobj,
struct device, kobj));
@@ -449,7 +449,21 @@
vma->vm_pgoff += start >> PAGE_SHIFT;
mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
- return pci_mmap_page_range(pdev, vma, mmap_type, 0);
+ 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);
}
/**
@@ -472,9 +486,46 @@
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
@@ -488,31 +539,18 @@
/* Expose the PCI resources from this device as files */
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
- struct bin_attribute *res_attr;
-
/* skip empty resources */
if (!pci_resource_len(pdev, i))
continue;
- /* allocate attribute structure, piggyback attribute name */
- res_attr = kzalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
- if (res_attr) {
- char *res_attr_name = (char *)(res_attr + 1);
+ 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);
- pdev->res_attr[i] = res_attr;
- sprintf(res_attr_name, "resource%d", i);
- res_attr->attr.name = res_attr_name;
- res_attr->attr.mode = S_IRUSR | S_IWUSR;
- res_attr->size = pci_resource_len(pdev, i);
- res_attr->mmap = pci_mmap_resource;
- res_attr->private = &pdev->resource[i];
- retval = sysfs_create_bin_file(&pdev->dev.kobj,
res_attr);
- if (retval) {
- pci_remove_resource_files(pdev);
- return retval;
- }
- } else {
- return -ENOMEM;
+ if (retval) {
+ pci_remove_resource_files(pdev);
+ return retval;
}
}
return 0;
Index: linux-2.6.git/include/linux/pci.h
===================================================================
--- linux-2.6.git.orig/include/linux/pci.h 2008-01-08 10:53:10.000000000
-0800
+++ linux-2.6.git/include/linux/pci.h 2008-01-08 12:51:22.000000000 -0800
@@ -201,6 +201,7 @@
struct bin_attribute *rom_attr; /* attribute descriptor for sysfs ROM
entry */
int rom_attr_enabled; /* has display of the rom attribute
been enabled? */
struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file
for resources */
+ struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file
for WC mapping of resources */
#ifdef CONFIG_PCI_MSI
struct list_head msi_list;
#endif
--
--
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