diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ia64/aliasing-test.c | 26 | ||||
| -rw-r--r-- | Documentation/ia64/aliasing.txt | 12 |
2 files changed, 31 insertions, 7 deletions
diff --git a/Documentation/ia64/aliasing-test.c b/Documentation/ia64/aliasing-test.c index d485256..773a814 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 9a431a7..aa3e953 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 |
