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-rw-r--r--Documentation/ia64/aliasing-test.c26
-rw-r--r--Documentation/ia64/aliasing.txt12
2 files changed, 31 insertions, 7 deletions
diff --git a/Documentation/ia64/aliasing-test.c b/Documentation/ia64/aliasing-test.c
index d485256ee1ce..773a814d4093 100644
--- a/Documentation/ia64/aliasing-test.c
+++ b/Documentation/ia64/aliasing-test.c
@@ -19,6 +19,7 @@
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
+#include <linux/pci.h>
int sum;
@@ -34,13 +35,19 @@ int map_mem(char *path, off_t offset, size_t length, int touch)
return -1;
}
+ if (fnmatch("/proc/bus/pci/*", path, 0) == 0) {
+ rc = ioctl(fd, PCIIOC_MMAP_IS_MEM);
+ if (rc == -1)
+ perror("PCIIOC_MMAP_IS_MEM ioctl");
+ }
+
addr = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
if (addr == MAP_FAILED)
return 1;
if (touch) {
c = (int *) addr;
- while (c < (int *) (offset + length))
+ while (c < (int *) (addr + length))
sum += *c++;
}
@@ -54,7 +61,7 @@ int map_mem(char *path, off_t offset, size_t length, int touch)
return 0;
}
-int scan_sysfs(char *path, char *file, off_t offset, size_t length, int touch)
+int scan_tree(char *path, char *file, off_t offset, size_t length, int touch)
{
struct dirent **namelist;
char *name, *path2;
@@ -93,7 +100,7 @@ int scan_sysfs(char *path, char *file, off_t offset, size_t length, int touch)
} else {
r = lstat(path2, &buf);
if (r == 0 && S_ISDIR(buf.st_mode)) {
- rc = scan_sysfs(path2, file, offset, length, touch);
+ rc = scan_tree(path2, file, offset, length, touch);
if (rc < 0)
return rc;
}
@@ -238,10 +245,15 @@ int main()
else
fprintf(stderr, "FAIL: /dev/mem 0x0-0x100000 not accessible\n");
- scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0, 0xA0000, 1);
- scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0xA0000, 0x20000, 0);
- scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0xC0000, 0x40000, 1);
- scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0, 1024*1024, 0);
+ scan_tree("/sys/class/pci_bus", "legacy_mem", 0, 0xA0000, 1);
+ scan_tree("/sys/class/pci_bus", "legacy_mem", 0xA0000, 0x20000, 0);
+ scan_tree("/sys/class/pci_bus", "legacy_mem", 0xC0000, 0x40000, 1);
+ scan_tree("/sys/class/pci_bus", "legacy_mem", 0, 1024*1024, 0);
scan_rom("/sys/devices", "rom");
+
+ scan_tree("/proc/bus/pci", "??.?", 0, 0xA0000, 1);
+ scan_tree("/proc/bus/pci", "??.?", 0xA0000, 0x20000, 0);
+ scan_tree("/proc/bus/pci", "??.?", 0xC0000, 0x40000, 1);
+ scan_tree("/proc/bus/pci", "??.?", 0, 1024*1024, 0);
}
diff --git a/Documentation/ia64/aliasing.txt b/Documentation/ia64/aliasing.txt
index 9a431a7d0f5d..aa3e953f0f7b 100644
--- a/Documentation/ia64/aliasing.txt
+++ b/Documentation/ia64/aliasing.txt
@@ -112,6 +112,18 @@ POTENTIAL ATTRIBUTE ALIASING CASES
The /dev/mem mmap constraints apply.
+ mmap of /proc/bus/pci/.../??.?
+
+ This is an MMIO mmap of PCI functions, which additionally may or
+ may not be requested as using the WC attribute.
+
+ If WC is requested, and the region in kern_memmap is either WC
+ or UC, and the EFI memory map designates the region as WC, then
+ the WC mapping is allowed.
+
+ Otherwise, the user mapping must use the same attribute as the
+ kernel mapping.
+
read/write of /dev/mem
This uses copy_from_user(), which implicitly uses a kernel

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