diff options
| -rw-r--r-- | Documentation/ia64/aliasing-test.c | 247 | ||||
| -rw-r--r-- | Documentation/ia64/aliasing.txt | 71 | ||||
| -rw-r--r-- | arch/ia64/kernel/efi.c | 46 | ||||
| -rw-r--r-- | arch/ia64/mm/ioremap.c | 78 | ||||
| -rw-r--r-- | arch/ia64/pci/pci.c | 2 | ||||
| -rw-r--r-- | include/asm-ia64/io.h | 6 |
6 files changed, 392 insertions, 58 deletions
diff --git a/Documentation/ia64/aliasing-test.c b/Documentation/ia64/aliasing-test.c new file mode 100644 index 0000000..3153167 --- /dev/null +++ b/Documentation/ia64/aliasing-test.c @@ -0,0 +1,247 @@ +/* + * Exercise /dev/mem mmap cases that have been troublesome in the past + * + * (c) Copyright 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 + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <stdlib.h> +#include <stdio.h> +#include <sys/types.h> +#include <dirent.h> +#include <fcntl.h> +#include <fnmatch.h> +#include <string.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <unistd.h> + +int sum; + +int map_mem(char *path, off_t offset, size_t length, int touch) +{ + int fd, rc; + void *addr; + int *c; + + fd = open(path, O_RDWR); + if (fd == -1) { + perror(path); + return -1; + } + + 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)) + sum += *c++; + } + + rc = munmap(addr, length); + if (rc == -1) { + perror("munmap"); + return -1; + } + + close(fd); + return 0; +} + +int scan_sysfs(char *path, char *file, off_t offset, size_t length, int touch) +{ + struct dirent **namelist; + char *name, *path2; + int i, n, r, rc, result = 0; + struct stat buf; + + n = scandir(path, &namelist, 0, alphasort); + if (n < 0) { + perror("scandir"); + return -1; + } + + for (i = 0; i < n; i++) { + name = namelist[i]->d_name; + + if (fnmatch(".", name, 0) == 0) + goto skip; + if (fnmatch("..", name, 0) == 0) + goto skip; + + path2 = malloc(strlen(path) + strlen(name) + 3); + strcpy(path2, path); + strcat(path2, "/"); + strcat(path2, name); + + if (fnmatch(file, name, 0) == 0) { + rc = map_mem(path2, offset, length, touch); + if (rc == 0) + fprintf(stderr, "PASS: %s 0x%lx-0x%lx is %s\n", path2, offset, offset + length, touch ? "readable" : "mappable"); + else if (rc > 0) + fprintf(stderr, "PASS: %s 0x%lx-0x%lx not mappable\n", path2, offset, offset + length); + else { + fprintf(stderr, "FAIL: %s 0x%lx-0x%lx not accessible\n", path2, offset, offset + length); + return rc; + } + } else { + r = lstat(path2, &buf); + if (r == 0 && S_ISDIR(buf.st_mode)) { + rc = scan_sysfs(path2, file, offset, length, touch); + if (rc < 0) + return rc; + } + } + + result |= rc; + free(path2); + +skip: + free(namelist[i]); + } + free(namelist); + return rc; +} + +char buf[1024]; + +int read_rom(char *path) +{ + int fd, rc; + size_t size = 0; + + fd = open(path, O_RDWR); + if (fd == -1) { + perror(path); + return -1; + } + + rc = write(fd, "1", 2); + if (rc <= 0) { + perror("write"); + return -1; + } + + do { + rc = read(fd, buf, sizeof(buf)); + if (rc > 0) + size += rc; + } while (rc > 0); + + close(fd); + return size; +} + +int scan_rom(char *path, char *file) +{ + struct dirent **namelist; + char *name, *path2; + int i, n, r, rc, result = 0; + struct stat buf; + + n = scandir(path, &namelist, 0, alphasort); + if (n < 0) { + perror("scandir"); + return -1; + } + + for (i = 0; i < n; i++) { + name = namelist[i]->d_name; + + if (fnmatch(".", name, 0) == 0) + goto skip; + if (fnmatch("..", name, 0) == 0) + goto skip; + + path2 = malloc(strlen(path) + strlen(name) + 3); + strcpy(path2, path); + strcat(path2, "/"); + strcat(path2, name); + + if (fnmatch(file, name, 0) == 0) { + rc = read_rom(path2); + + /* + * It's OK if the ROM is unreadable. Maybe there + * is no ROM, or some other error ocurred. The + * important thing is that no MCA happened. + */ + if (rc > 0) + fprintf(stderr, "PASS: %s read %ld bytes\n", path2, rc); + else { + fprintf(stderr, "PASS: %s not readable\n", path2); + return rc; + } + } else { + r = lstat(path2, &buf); + if (r == 0 && S_ISDIR(buf.st_mode)) { + rc = scan_rom(path2, file); + if (rc < 0) + return rc; + } + } + + result |= rc; + free(path2); + +skip: + free(namelist[i]); + } + free(namelist); + return rc; +} + +main() +{ + int rc; + + if (map_mem("/dev/mem", 0, 0xA0000, 1) == 0) + fprintf(stderr, "PASS: /dev/mem 0x0-0xa0000 is readable\n"); + else + fprintf(stderr, "FAIL: /dev/mem 0x0-0xa0000 not accessible\n"); + + /* + * It's not safe to blindly read the VGA frame buffer. If you know + * how to poke the card the right way, it should respond, but it's + * not safe in general. Many machines, e.g., Intel chipsets, cover + * up a non-responding card by just returning -1, but others will + * report the failure as a machine check. + */ + if (map_mem("/dev/mem", 0xA0000, 0x20000, 0) == 0) + fprintf(stderr, "PASS: /dev/mem 0xa0000-0xc0000 is mappable\n"); + else + fprintf(stderr, "FAIL: /dev/mem 0xa0000-0xc0000 not accessible\n"); + + if (map_mem("/dev/mem", 0xC0000, 0x40000, 1) == 0) + fprintf(stderr, "PASS: /dev/mem 0xc0000-0x100000 is readable\n"); + else + fprintf(stderr, "FAIL: /dev/mem 0xc0000-0x100000 not accessible\n"); + + /* + * Often you can map all the individual pieces above (0-0xA0000, + * 0xA0000-0xC0000, and 0xC0000-0x100000), but can't map the whole + * thing at once. This is because the individual pieces use different + * attributes, and there's no single attribute supported over the + * whole region. + */ + rc = map_mem("/dev/mem", 0, 1024*1024, 0); + if (rc == 0) + fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 is mappable\n"); + else if (rc > 0) + fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 not mappable\n"); + 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_rom("/sys/devices", "rom"); +} diff --git a/Documentation/ia64/aliasing.txt b/Documentation/ia64/aliasing.txt index 38f9a52..9a431a7 100644 --- a/Documentation/ia64/aliasing.txt +++ b/Documentation/ia64/aliasing.txt @@ -112,16 +112,6 @@ POTENTIAL ATTRIBUTE ALIASING CASES The /dev/mem mmap constraints apply. - However, since this is for mapping legacy MMIO space, WB access - does not make sense. This matters on machines without legacy - VGA support: these machines may have WB memory for the entire - first megabyte (or even the entire first granule). - - On these machines, we could mmap legacy_mem as WB, which would - be safe in terms of attribute aliasing, but X has no way of - knowing that it is accessing regular memory, not a frame buffer, - so the kernel should fail the mmap rather than doing it with WB. - read/write of /dev/mem This uses copy_from_user(), which implicitly uses a kernel @@ -138,14 +128,20 @@ POTENTIAL ATTRIBUTE ALIASING CASES ioremap() - This returns a kernel identity mapping for use inside the - kernel. + This returns a mapping for use inside the kernel. If the region is in kern_memmap, we should use the attribute - specified there. Otherwise, if the EFI memory map reports that - the entire granule supports WB, we should use that (granules - that are partially reserved or occupied by firmware do not appear - in kern_memmap). Otherwise, we should use a UC mapping. + specified there. + + If the EFI memory map reports that the entire granule supports + WB, we should use that (granules that are partially reserved + or occupied by firmware do not appear in kern_memmap). + + If the granule contains non-WB memory, but we can cover the + region safely with kernel page table mappings, we can use + ioremap_page_range() as most other architectures do. + + Failing all of the above, we have to fall back to a UC mapping. PAST PROBLEM CASES @@ -158,7 +154,7 @@ PAST PROBLEM CASES succeed. It may create either WB or UC user mappings, depending on whether the region is in kern_memmap or the EFI memory map. - mmap of 0x0-0xA0000 /dev/mem by "hwinfo" on HP sx1000 with VGA enabled + mmap of 0x0-0x9FFFF /dev/mem by "hwinfo" on HP sx1000 with VGA enabled See https://bugzilla.novell.com/show_bug.cgi?id=140858. @@ -171,28 +167,25 @@ PAST PROBLEM CASES so it is safe to use WB mappings. The kernel VGA driver may ioremap the VGA frame buffer at 0xA0000, - which will use a granule-sized UC mapping covering 0-0xFFFFF. This - granule covers some WB-only memory, but since UC is non-speculative, - the processor will never generate an uncacheable reference to the - WB-only areas unless the driver explicitly touches them. + which uses a granule-sized UC mapping. This granule will cover some + WB-only memory, but since UC is non-speculative, the processor will + never generate an uncacheable reference to the WB-only areas unless + the driver explicitly touches them. mmap of 0x0-0xFFFFF legacy_mem by "X" - If the EFI memory map reports this entire range as WB, there - is no VGA MMIO hole, and the mmap should fail or be done with - a WB mapping. + If the EFI memory map reports that the entire range supports the + same attributes, we can allow the mmap (and we will prefer WB if + supported, as is the case with HP sx[12]000 machines with VGA + disabled). - There's no easy way for X to determine whether the 0xA0000-0xBFFFF - region is a frame buffer or just memory, so I think it's best to - just fail this mmap request rather than using a WB mapping. As - far as I know, there's no need to map legacy_mem with WB - mappings. + If EFI reports the range as partly WB and partly UC (as on sx[12]000 + machines with VGA enabled), we must fail the mmap because there's no + safe attribute to use. - Otherwise, a UC mapping of the entire region is probably safe. - The VGA hole means the region will not be in kern_memmap. The - HP sx1000 chipset doesn't support UC access to the memory surrounding - the VGA hole, but X doesn't need that area anyway and should not - reference it. + If EFI reports some of the range but not all (as on Intel firmware + that doesn't report the VGA frame buffer at all), we should fail the + mmap and force the user to map just the specific region of interest. mmap of 0xA0000-0xBFFFF legacy_mem by "X" on HP sx1000 with VGA disabled @@ -202,6 +195,16 @@ PAST PROBLEM CASES This is a special case of the previous case, and the mmap should fail for the same reason as above. + read of /sys/devices/.../rom + + For VGA devices, this may cause an ioremap() of 0xC0000. This + used to be done with a UC mapping, because the VGA frame buffer + at 0xA0000 prevents use of a WB granule. The UC mapping causes + an MCA on HP sx[12]000 chipsets. + + We should use WB page table mappings to avoid covering the VGA + frame buffer. + NOTES [1] SDM rev 2.2, vol 2, sec 4.4.1. diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c index f45f91d..78d29b7 100644 --- a/arch/ia64/kernel/efi.c +++ b/arch/ia64/kernel/efi.c @@ -660,6 +660,29 @@ efi_memory_descriptor (unsigned long phys_addr) return NULL; } +static int +efi_memmap_intersects (unsigned long phys_addr, unsigned long size) +{ + void *efi_map_start, *efi_map_end, *p; + efi_memory_desc_t *md; + u64 efi_desc_size; + unsigned long end; + + efi_map_start = __va(ia64_boot_param->efi_memmap); + efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; + efi_desc_size = ia64_boot_param->efi_memdesc_size; + + end = phys_addr + size; + + for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { + 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) int valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size) { + unsigned long phys_addr = pfn << PAGE_SHIFT; + u64 attr; + + attr = efi_mem_attribute(phys_addr, size); + /* - * 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; } diff --git a/arch/ia64/mm/ioremap.c b/arch/ia64/mm/ioremap.c index 4280c07..2a14062 100644 --- a/arch/ia64/mm/ioremap.c +++ b/arch/ia64/mm/ioremap.c @@ -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); diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index 0e83f3b..9f63589 100644 --- a/arch/ia64/pci/pci.c +++ b/arch/ia64/pci/pci.c @@ -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)) diff --git a/include/asm-ia64/io.h b/include/asm-ia64/io.h index 6311e16..eb17a86 100644 --- a/include/asm-ia64/io.h +++ b/include/asm-ia64/io.h @@ -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 |
