[IA64] prevent MCA when performing MMIO mmap to PCI config space

Example memory map (HP rx7640 with 'default' acpiconfig setting, VGA disabled):
   0x00000000 - 0x3FFFBFFF  supports only WB (cacheable) access

If a user attempts to perform an MMIO mmap (using the PCIIOC_MMAP_IS_MEM ioctl)
to PCI config space (like mmap'ing and accessing memory at 0xA0000),
we will MCA because the kernel will attempt to use a mapping with the UC
attribute.

So check the memory attribute in kern_mmap and the EFI memmap. If WC is
requested, and WC or UC access is supported for the region, allow it.
Otherwise, use the same attribute the kernel uses.

Updates documentation and test cases as well.

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 19 insertions, 7 deletions

diff --git a/Documentation/ia64/aliasing-test.c b/Documentation/ia64/aliasing-test.c
index d485256ee1c..773a814d409 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);
 }