Pull mem-attribute into release branch
This commit is contained in:
Tony Luck
commit
d29182534c
6 changed files with 392 additions and 58 deletions
247
Documentation/ia64/aliasing-test.c
Normal file
247
Documentation/ia64/aliasing-test.c
Normal file
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@ -0,0 +1,247 @@
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/*
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* Exercise /dev/mem mmap cases that have been troublesome in the past
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*
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* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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int sum;
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int map_mem(char *path, off_t offset, size_t length, int touch)
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{
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int fd, rc;
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void *addr;
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int *c;
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fd = open(path, O_RDWR);
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if (fd == -1) {
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perror(path);
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return -1;
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}
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addr = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
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if (addr == MAP_FAILED)
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return 1;
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if (touch) {
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c = (int *) addr;
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while (c < (int *) (offset + length))
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sum += *c++;
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}
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rc = munmap(addr, length);
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if (rc == -1) {
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perror("munmap");
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return -1;
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}
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close(fd);
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return 0;
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}
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int scan_sysfs(char *path, char *file, off_t offset, size_t length, int touch)
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{
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struct dirent **namelist;
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char *name, *path2;
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int i, n, r, rc, result = 0;
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struct stat buf;
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n = scandir(path, &namelist, 0, alphasort);
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if (n < 0) {
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perror("scandir");
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return -1;
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}
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for (i = 0; i < n; i++) {
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name = namelist[i]->d_name;
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if (fnmatch(".", name, 0) == 0)
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goto skip;
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if (fnmatch("..", name, 0) == 0)
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goto skip;
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path2 = malloc(strlen(path) + strlen(name) + 3);
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strcpy(path2, path);
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strcat(path2, "/");
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strcat(path2, name);
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if (fnmatch(file, name, 0) == 0) {
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rc = map_mem(path2, offset, length, touch);
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if (rc == 0)
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fprintf(stderr, "PASS: %s 0x%lx-0x%lx is %s\n", path2, offset, offset + length, touch ? "readable" : "mappable");
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else if (rc > 0)
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fprintf(stderr, "PASS: %s 0x%lx-0x%lx not mappable\n", path2, offset, offset + length);
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else {
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fprintf(stderr, "FAIL: %s 0x%lx-0x%lx not accessible\n", path2, offset, offset + length);
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return rc;
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}
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} else {
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r = lstat(path2, &buf);
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if (r == 0 && S_ISDIR(buf.st_mode)) {
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rc = scan_sysfs(path2, file, offset, length, touch);
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if (rc < 0)
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return rc;
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}
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}
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result |= rc;
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free(path2);
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skip:
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free(namelist[i]);
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}
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free(namelist);
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return rc;
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}
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char buf[1024];
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int read_rom(char *path)
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{
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int fd, rc;
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size_t size = 0;
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fd = open(path, O_RDWR);
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if (fd == -1) {
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perror(path);
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return -1;
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}
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rc = write(fd, "1", 2);
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if (rc <= 0) {
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perror("write");
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return -1;
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}
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do {
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rc = read(fd, buf, sizeof(buf));
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if (rc > 0)
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size += rc;
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} while (rc > 0);
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close(fd);
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return size;
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}
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int scan_rom(char *path, char *file)
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{
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struct dirent **namelist;
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char *name, *path2;
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int i, n, r, rc, result = 0;
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struct stat buf;
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n = scandir(path, &namelist, 0, alphasort);
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if (n < 0) {
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perror("scandir");
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return -1;
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}
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for (i = 0; i < n; i++) {
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name = namelist[i]->d_name;
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if (fnmatch(".", name, 0) == 0)
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goto skip;
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if (fnmatch("..", name, 0) == 0)
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goto skip;
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path2 = malloc(strlen(path) + strlen(name) + 3);
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strcpy(path2, path);
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strcat(path2, "/");
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strcat(path2, name);
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if (fnmatch(file, name, 0) == 0) {
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rc = read_rom(path2);
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/*
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* It's OK if the ROM is unreadable. Maybe there
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* is no ROM, or some other error ocurred. The
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* important thing is that no MCA happened.
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*/
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if (rc > 0)
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fprintf(stderr, "PASS: %s read %ld bytes\n", path2, rc);
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else {
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fprintf(stderr, "PASS: %s not readable\n", path2);
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return rc;
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}
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} else {
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r = lstat(path2, &buf);
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if (r == 0 && S_ISDIR(buf.st_mode)) {
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rc = scan_rom(path2, file);
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if (rc < 0)
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return rc;
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}
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}
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result |= rc;
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free(path2);
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skip:
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free(namelist[i]);
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}
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free(namelist);
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return rc;
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}
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main()
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{
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int rc;
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if (map_mem("/dev/mem", 0, 0xA0000, 1) == 0)
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fprintf(stderr, "PASS: /dev/mem 0x0-0xa0000 is readable\n");
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else
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fprintf(stderr, "FAIL: /dev/mem 0x0-0xa0000 not accessible\n");
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/*
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* It's not safe to blindly read the VGA frame buffer. If you know
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* how to poke the card the right way, it should respond, but it's
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* not safe in general. Many machines, e.g., Intel chipsets, cover
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* up a non-responding card by just returning -1, but others will
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* report the failure as a machine check.
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*/
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if (map_mem("/dev/mem", 0xA0000, 0x20000, 0) == 0)
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fprintf(stderr, "PASS: /dev/mem 0xa0000-0xc0000 is mappable\n");
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else
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fprintf(stderr, "FAIL: /dev/mem 0xa0000-0xc0000 not accessible\n");
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if (map_mem("/dev/mem", 0xC0000, 0x40000, 1) == 0)
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fprintf(stderr, "PASS: /dev/mem 0xc0000-0x100000 is readable\n");
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else
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fprintf(stderr, "FAIL: /dev/mem 0xc0000-0x100000 not accessible\n");
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/*
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* Often you can map all the individual pieces above (0-0xA0000,
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* 0xA0000-0xC0000, and 0xC0000-0x100000), but can't map the whole
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* thing at once. This is because the individual pieces use different
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* attributes, and there's no single attribute supported over the
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* whole region.
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*/
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rc = map_mem("/dev/mem", 0, 1024*1024, 0);
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if (rc == 0)
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fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 is mappable\n");
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else if (rc > 0)
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fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 not mappable\n");
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else
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fprintf(stderr, "FAIL: /dev/mem 0x0-0x100000 not accessible\n");
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scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0, 0xA0000, 1);
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scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0xA0000, 0x20000, 0);
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scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0xC0000, 0x40000, 1);
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scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0, 1024*1024, 0);
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scan_rom("/sys/devices", "rom");
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}
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@ -112,16 +112,6 @@ POTENTIAL ATTRIBUTE ALIASING CASES
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The /dev/mem mmap constraints apply.
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However, since this is for mapping legacy MMIO space, WB access
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does not make sense. This matters on machines without legacy
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VGA support: these machines may have WB memory for the entire
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first megabyte (or even the entire first granule).
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On these machines, we could mmap legacy_mem as WB, which would
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be safe in terms of attribute aliasing, but X has no way of
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knowing that it is accessing regular memory, not a frame buffer,
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so the kernel should fail the mmap rather than doing it with WB.
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read/write of /dev/mem
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This uses copy_from_user(), which implicitly uses a kernel
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@ -138,14 +128,20 @@ POTENTIAL ATTRIBUTE ALIASING CASES
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ioremap()
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This returns a kernel identity mapping for use inside the
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kernel.
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This returns a mapping for use inside the kernel.
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If the region is in kern_memmap, we should use the attribute
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specified there. Otherwise, if the EFI memory map reports that
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the entire granule supports WB, we should use that (granules
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that are partially reserved or occupied by firmware do not appear
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in kern_memmap). Otherwise, we should use a UC mapping.
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specified there.
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If the EFI memory map reports that the entire granule supports
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WB, we should use that (granules that are partially reserved
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or occupied by firmware do not appear in kern_memmap).
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If the granule contains non-WB memory, but we can cover the
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region safely with kernel page table mappings, we can use
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ioremap_page_range() as most other architectures do.
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Failing all of the above, we have to fall back to a UC mapping.
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PAST PROBLEM CASES
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@ -158,7 +154,7 @@ PAST PROBLEM CASES
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succeed. It may create either WB or UC user mappings, depending
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on whether the region is in kern_memmap or the EFI memory map.
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mmap of 0x0-0xA0000 /dev/mem by "hwinfo" on HP sx1000 with VGA enabled
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mmap of 0x0-0x9FFFF /dev/mem by "hwinfo" on HP sx1000 with VGA enabled
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See https://bugzilla.novell.com/show_bug.cgi?id=140858.
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@ -171,28 +167,25 @@ PAST PROBLEM CASES
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so it is safe to use WB mappings.
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The kernel VGA driver may ioremap the VGA frame buffer at 0xA0000,
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which will use a granule-sized UC mapping covering 0-0xFFFFF. This
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granule covers some WB-only memory, but since UC is non-speculative,
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the processor will never generate an uncacheable reference to the
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WB-only areas unless the driver explicitly touches them.
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which uses a granule-sized UC mapping. This granule will cover some
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WB-only memory, but since UC is non-speculative, the processor will
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never generate an uncacheable reference to the WB-only areas unless
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the driver explicitly touches them.
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mmap of 0x0-0xFFFFF legacy_mem by "X"
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|
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If the EFI memory map reports this entire range as WB, there
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is no VGA MMIO hole, and the mmap should fail or be done with
|
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a WB mapping.
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If the EFI memory map reports that the entire range supports the
|
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same attributes, we can allow the mmap (and we will prefer WB if
|
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supported, as is the case with HP sx[12]000 machines with VGA
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disabled).
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There's no easy way for X to determine whether the 0xA0000-0xBFFFF
|
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region is a frame buffer or just memory, so I think it's best to
|
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just fail this mmap request rather than using a WB mapping. As
|
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far as I know, there's no need to map legacy_mem with WB
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mappings.
|
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If EFI reports the range as partly WB and partly UC (as on sx[12]000
|
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machines with VGA enabled), we must fail the mmap because there's no
|
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safe attribute to use.
|
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|
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Otherwise, a UC mapping of the entire region is probably safe.
|
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The VGA hole means the region will not be in kern_memmap. The
|
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HP sx1000 chipset doesn't support UC access to the memory surrounding
|
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the VGA hole, but X doesn't need that area anyway and should not
|
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reference it.
|
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If EFI reports some of the range but not all (as on Intel firmware
|
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that doesn't report the VGA frame buffer at all), we should fail the
|
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mmap and force the user to map just the specific region of interest.
|
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|
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mmap of 0xA0000-0xBFFFF legacy_mem by "X" on HP sx1000 with VGA disabled
|
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|
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@ -202,6 +195,16 @@ PAST PROBLEM CASES
|
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This is a special case of the previous case, and the mmap should
|
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fail for the same reason as above.
|
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|
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read of /sys/devices/.../rom
|
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|
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For VGA devices, this may cause an ioremap() of 0xC0000. This
|
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used to be done with a UC mapping, because the VGA frame buffer
|
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at 0xA0000 prevents use of a WB granule. The UC mapping causes
|
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an MCA on HP sx[12]000 chipsets.
|
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|
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We should use WB page table mappings to avoid covering the VGA
|
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frame buffer.
|
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|
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NOTES
|
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|
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[1] SDM rev 2.2, vol 2, sec 4.4.1.
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|
|
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@ -660,6 +660,29 @@ efi_memory_descriptor (unsigned long phys_addr)
|
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return NULL;
|
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}
|
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|
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static int
|
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efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
|
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{
|
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void *efi_map_start, *efi_map_end, *p;
|
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efi_memory_desc_t *md;
|
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u64 efi_desc_size;
|
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unsigned long end;
|
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|
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efi_map_start = __va(ia64_boot_param->efi_memmap);
|
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efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
|
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efi_desc_size = ia64_boot_param->efi_memdesc_size;
|
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|
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end = phys_addr + size;
|
||||
|
||||
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
|
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md = p;
|
||||
|
||||
if (md->phys_addr < end && efi_md_end(md) > phys_addr)
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
u32
|
||||
efi_mem_type (unsigned long phys_addr)
|
||||
{
|
||||
|
|
@ -766,11 +789,28 @@ valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
|
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int
|
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valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
|
||||
{
|
||||
unsigned long phys_addr = pfn << PAGE_SHIFT;
|
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u64 attr;
|
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|
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attr = efi_mem_attribute(phys_addr, size);
|
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|
||||
/*
|
||||
* MMIO regions are often missing from the EFI memory map.
|
||||
* We must allow mmap of them for programs like X, so we
|
||||
* currently can't do any useful validation.
|
||||
* /dev/mem mmap uses normal user pages, so we don't need the entire
|
||||
* granule, but the entire region we're mapping must support the same
|
||||
* attribute.
|
||||
*/
|
||||
if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
|
||||
return 1;
|
||||
|
||||
/*
|
||||
* Intel firmware doesn't tell us about all the MMIO regions, so
|
||||
* in general we have to allow mmap requests. But if EFI *does*
|
||||
* tell us about anything inside this region, we should deny it.
|
||||
* The user can always map a smaller region to avoid the overlap.
|
||||
*/
|
||||
if (efi_memmap_intersects(phys_addr, size))
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
|
||||
* (c) Copyright 2006, 2007 Hewlett-Packard Development Company, L.P.
|
||||
* Bjorn Helgaas <bjorn.helgaas@hp.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
|
|
@ -10,51 +10,101 @@
|
|||
#include <linux/compiler.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/efi.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/meminit.h>
|
||||
|
||||
static inline void __iomem *
|
||||
__ioremap (unsigned long offset, unsigned long size)
|
||||
__ioremap (unsigned long phys_addr)
|
||||
{
|
||||
return (void __iomem *) (__IA64_UNCACHED_OFFSET | offset);
|
||||
return (void __iomem *) (__IA64_UNCACHED_OFFSET | phys_addr);
|
||||
}
|
||||
|
||||
void __iomem *
|
||||
ioremap (unsigned long offset, unsigned long size)
|
||||
ioremap (unsigned long phys_addr, unsigned long size)
|
||||
{
|
||||
void __iomem *addr;
|
||||
struct vm_struct *area;
|
||||
unsigned long offset;
|
||||
pgprot_t prot;
|
||||
u64 attr;
|
||||
unsigned long gran_base, gran_size;
|
||||
unsigned long page_base;
|
||||
|
||||
/*
|
||||
* For things in kern_memmap, we must use the same attribute
|
||||
* as the rest of the kernel. For more details, see
|
||||
* Documentation/ia64/aliasing.txt.
|
||||
*/
|
||||
attr = kern_mem_attribute(offset, size);
|
||||
attr = kern_mem_attribute(phys_addr, size);
|
||||
if (attr & EFI_MEMORY_WB)
|
||||
return (void __iomem *) phys_to_virt(offset);
|
||||
return (void __iomem *) phys_to_virt(phys_addr);
|
||||
else if (attr & EFI_MEMORY_UC)
|
||||
return __ioremap(offset, size);
|
||||
return __ioremap(phys_addr);
|
||||
|
||||
/*
|
||||
* Some chipsets don't support UC access to memory. If
|
||||
* WB is supported for the whole granule, we prefer that.
|
||||
*/
|
||||
gran_base = GRANULEROUNDDOWN(offset);
|
||||
gran_size = GRANULEROUNDUP(offset + size) - gran_base;
|
||||
gran_base = GRANULEROUNDDOWN(phys_addr);
|
||||
gran_size = GRANULEROUNDUP(phys_addr + size) - gran_base;
|
||||
if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB)
|
||||
return (void __iomem *) phys_to_virt(offset);
|
||||
return (void __iomem *) phys_to_virt(phys_addr);
|
||||
|
||||
return __ioremap(offset, size);
|
||||
/*
|
||||
* WB is not supported for the whole granule, so we can't use
|
||||
* the region 7 identity mapping. If we can safely cover the
|
||||
* area with kernel page table mappings, we can use those
|
||||
* instead.
|
||||
*/
|
||||
page_base = phys_addr & PAGE_MASK;
|
||||
size = PAGE_ALIGN(phys_addr + size) - page_base;
|
||||
if (efi_mem_attribute(page_base, size) & EFI_MEMORY_WB) {
|
||||
prot = PAGE_KERNEL;
|
||||
|
||||
/*
|
||||
* Mappings have to be page-aligned
|
||||
*/
|
||||
offset = phys_addr & ~PAGE_MASK;
|
||||
phys_addr &= PAGE_MASK;
|
||||
|
||||
/*
|
||||
* Ok, go for it..
|
||||
*/
|
||||
area = get_vm_area(size, VM_IOREMAP);
|
||||
if (!area)
|
||||
return NULL;
|
||||
|
||||
area->phys_addr = phys_addr;
|
||||
addr = (void __iomem *) area->addr;
|
||||
if (ioremap_page_range((unsigned long) addr,
|
||||
(unsigned long) addr + size, phys_addr, prot)) {
|
||||
vunmap((void __force *) addr);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return (void __iomem *) (offset + (char __iomem *)addr);
|
||||
}
|
||||
|
||||
return __ioremap(phys_addr);
|
||||
}
|
||||
EXPORT_SYMBOL(ioremap);
|
||||
|
||||
void __iomem *
|
||||
ioremap_nocache (unsigned long offset, unsigned long size)
|
||||
ioremap_nocache (unsigned long phys_addr, unsigned long size)
|
||||
{
|
||||
if (kern_mem_attribute(offset, size) & EFI_MEMORY_WB)
|
||||
if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
|
||||
return NULL;
|
||||
|
||||
return __ioremap(offset, size);
|
||||
return __ioremap(phys_addr);
|
||||
}
|
||||
EXPORT_SYMBOL(ioremap_nocache);
|
||||
|
||||
void
|
||||
iounmap (volatile void __iomem *addr)
|
||||
{
|
||||
if (REGION_NUMBER(addr) == RGN_GATE)
|
||||
vunmap((void *) ((unsigned long) addr & PAGE_MASK));
|
||||
}
|
||||
EXPORT_SYMBOL(iounmap);
|
||||
|
|
|
|||
|
|
@ -659,8 +659,6 @@ pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
|
|||
return -EINVAL;
|
||||
prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
|
||||
vma->vm_page_prot);
|
||||
if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot)))
|
||||
return -EINVAL;
|
||||
|
||||
addr = pci_get_legacy_mem(bus);
|
||||
if (IS_ERR(addr))
|
||||
|
|
|
|||
|
|
@ -421,11 +421,7 @@ __writeq (unsigned long val, volatile void __iomem *addr)
|
|||
|
||||
extern void __iomem * ioremap(unsigned long offset, unsigned long size);
|
||||
extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
|
||||
|
||||
static inline void
|
||||
iounmap (volatile void __iomem *addr)
|
||||
{
|
||||
}
|
||||
extern void iounmap (volatile void __iomem *addr);
|
||||
|
||||
/* Use normal IO mappings for DMI */
|
||||
#define dmi_ioremap ioremap
|
||||
|
|
|
|||
Loading…
Reference in a new issue