diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 19 | ||||
| -rw-r--r-- | lib/Makefile | 4 | ||||
| -rw-r--r-- | lib/atomic64.c | 11 | ||||
| -rw-r--r-- | lib/bitmap.c | 12 | ||||
| -rw-r--r-- | lib/checksum.c | 10 | ||||
| -rw-r--r-- | lib/decompress_bunzip2.c | 24 | ||||
| -rw-r--r-- | lib/decompress_inflate.c | 10 | ||||
| -rw-r--r-- | lib/decompress_unlzma.c | 23 | ||||
| -rw-r--r-- | lib/dma-debug.c | 203 | ||||
| -rw-r--r-- | lib/dynamic_debug.c | 2 | ||||
| -rw-r--r-- | lib/flex_array.c | 268 | ||||
| -rw-r--r-- | lib/gcd.c | 18 | ||||
| -rw-r--r-- | lib/lmb.c | 2 | ||||
| -rw-r--r-- | lib/scatterlist.c | 16 |
14 files changed, 512 insertions, 110 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 6b0c2d8a212..12327b2bb78 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -340,8 +340,6 @@ config DEBUG_KMEMLEAK bool "Kernel memory leak detector" depends on DEBUG_KERNEL && EXPERIMENTAL && (X86 || ARM) && \ !MEMORY_HOTPLUG - select DEBUG_SLAB if SLAB - select SLUB_DEBUG if SLUB select DEBUG_FS if SYSFS select STACKTRACE if STACKTRACE_SUPPORT select KALLSYMS @@ -355,9 +353,24 @@ config DEBUG_KMEMLEAK allocations. See Documentation/kmemleak.txt for more details. + Enabling DEBUG_SLAB or SLUB_DEBUG may increase the chances + of finding leaks due to the slab objects poisoning. + In order to access the kmemleak file, debugfs needs to be mounted (usually at /sys/kernel/debug). +config DEBUG_KMEMLEAK_EARLY_LOG_SIZE + int "Maximum kmemleak early log entries" + depends on DEBUG_KMEMLEAK + range 200 2000 + default 400 + help + Kmemleak must track all the memory allocations to avoid + reporting false positives. Since memory may be allocated or + freed before kmemleak is initialised, an early log buffer is + used to store these actions. If kmemleak reports "early log + buffer exceeded", please increase this value. + config DEBUG_KMEMLEAK_TEST tristate "Simple test for the kernel memory leak detector" depends on DEBUG_KMEMLEAK @@ -472,7 +485,7 @@ config LOCKDEP bool depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT select STACKTRACE - select FRAME_POINTER if !X86 && !MIPS && !PPC && !ARM_UNWIND && !S390 + select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 select KALLSYMS select KALLSYMS_ALL diff --git a/lib/Makefile b/lib/Makefile index 8e9bcf9d326..2e78277eff9 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -12,7 +12,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ idr.o int_sqrt.o extable.o prio_tree.o \ sha1.o irq_regs.o reciprocal_div.o argv_split.o \ proportions.o prio_heap.o ratelimit.o show_mem.o \ - is_single_threaded.o plist.o decompress.o + is_single_threaded.o plist.o decompress.o flex_array.o lib-$(CONFIG_MMU) += ioremap.o lib-$(CONFIG_SMP) += cpumask.o @@ -21,7 +21,7 @@ lib-y += kobject.o kref.o klist.o obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \ bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \ - string_helpers.o + string_helpers.o gcd.o ifeq ($(CONFIG_DEBUG_KOBJECT),y) CFLAGS_kobject.o += -DDEBUG diff --git a/lib/atomic64.c b/lib/atomic64.c index c5e72556241..8bee16ec752 100644 --- a/lib/atomic64.c +++ b/lib/atomic64.c @@ -13,6 +13,7 @@ #include <linux/cache.h> #include <linux/spinlock.h> #include <linux/init.h> +#include <linux/module.h> #include <asm/atomic.h> /* @@ -52,6 +53,7 @@ long long atomic64_read(const atomic64_t *v) spin_unlock_irqrestore(lock, flags); return val; } +EXPORT_SYMBOL(atomic64_read); void atomic64_set(atomic64_t *v, long long i) { @@ -62,6 +64,7 @@ void atomic64_set(atomic64_t *v, long long i) v->counter = i; spin_unlock_irqrestore(lock, flags); } +EXPORT_SYMBOL(atomic64_set); void atomic64_add(long long a, atomic64_t *v) { @@ -72,6 +75,7 @@ void atomic64_add(long long a, atomic64_t *v) v->counter += a; spin_unlock_irqrestore(lock, flags); } +EXPORT_SYMBOL(atomic64_add); long long atomic64_add_return(long long a, atomic64_t *v) { @@ -84,6 +88,7 @@ long long atomic64_add_return(long long a, atomic64_t *v) spin_unlock_irqrestore(lock, flags); return val; } +EXPORT_SYMBOL(atomic64_add_return); void atomic64_sub(long long a, atomic64_t *v) { @@ -94,6 +99,7 @@ void atomic64_sub(long long a, atomic64_t *v) v->counter -= a; spin_unlock_irqrestore(lock, flags); } +EXPORT_SYMBOL(atomic64_sub); long long atomic64_sub_return(long long a, atomic64_t *v) { @@ -106,6 +112,7 @@ long long atomic64_sub_return(long long a, atomic64_t *v) spin_unlock_irqrestore(lock, flags); return val; } +EXPORT_SYMBOL(atomic64_sub_return); long long atomic64_dec_if_positive(atomic64_t *v) { @@ -120,6 +127,7 @@ long long atomic64_dec_if_positive(atomic64_t *v) spin_unlock_irqrestore(lock, flags); return val; } +EXPORT_SYMBOL(atomic64_dec_if_positive); long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n) { @@ -134,6 +142,7 @@ long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n) spin_unlock_irqrestore(lock, flags); return val; } +EXPORT_SYMBOL(atomic64_cmpxchg); long long atomic64_xchg(atomic64_t *v, long long new) { @@ -147,6 +156,7 @@ long long atomic64_xchg(atomic64_t *v, long long new) spin_unlock_irqrestore(lock, flags); return val; } +EXPORT_SYMBOL(atomic64_xchg); int atomic64_add_unless(atomic64_t *v, long long a, long long u) { @@ -162,6 +172,7 @@ int atomic64_add_unless(atomic64_t *v, long long a, long long u) spin_unlock_irqrestore(lock, flags); return ret; } +EXPORT_SYMBOL(atomic64_add_unless); static int init_atomic64_lock(void) { diff --git a/lib/bitmap.c b/lib/bitmap.c index 35a1f7ff414..702565821c9 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -179,14 +179,16 @@ void __bitmap_shift_left(unsigned long *dst, } EXPORT_SYMBOL(__bitmap_shift_left); -void __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, +int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, int bits) { int k; int nr = BITS_TO_LONGS(bits); + unsigned long result = 0; for (k = 0; k < nr; k++) - dst[k] = bitmap1[k] & bitmap2[k]; + result |= (dst[k] = bitmap1[k] & bitmap2[k]); + return result != 0; } EXPORT_SYMBOL(__bitmap_and); @@ -212,14 +214,16 @@ void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1, } EXPORT_SYMBOL(__bitmap_xor); -void __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, +int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, int bits) { int k; int nr = BITS_TO_LONGS(bits); + unsigned long result = 0; for (k = 0; k < nr; k++) - dst[k] = bitmap1[k] & ~bitmap2[k]; + result |= (dst[k] = bitmap1[k] & ~bitmap2[k]); + return result != 0; } EXPORT_SYMBOL(__bitmap_andnot); diff --git a/lib/checksum.c b/lib/checksum.c index 12e5a1c91cd..b2e2fd46846 100644 --- a/lib/checksum.c +++ b/lib/checksum.c @@ -55,7 +55,11 @@ static unsigned int do_csum(const unsigned char *buff, int len) goto out; odd = 1 & (unsigned long) buff; if (odd) { +#ifdef __LITTLE_ENDIAN result = *buff; +#else + result += (*buff << 8); +#endif len--; buff++; } @@ -71,7 +75,7 @@ static unsigned int do_csum(const unsigned char *buff, int len) if (count) { unsigned long carry = 0; do { - unsigned long w = *(unsigned long *) buff; + unsigned long w = *(unsigned int *) buff; count--; buff += 4; result += carry; @@ -87,7 +91,11 @@ static unsigned int do_csum(const unsigned char *buff, int len) } } if (len & 1) +#ifdef __LITTLE_ENDIAN + result += *buff; +#else result += (*buff << 8); +#endif result = from32to16(result); if (odd) result = ((result >> 8) & 0xff) | ((result & 0xff) << 8); diff --git a/lib/decompress_bunzip2.c b/lib/decompress_bunzip2.c index 708e2a86d87..600f473a561 100644 --- a/lib/decompress_bunzip2.c +++ b/lib/decompress_bunzip2.c @@ -45,12 +45,14 @@ */ -#ifndef STATIC +#ifdef STATIC +#define PREBOOT +#else #include <linux/decompress/bunzip2.h> -#endif /* !STATIC */ +#include <linux/slab.h> +#endif /* STATIC */ #include <linux/decompress/mm.h> -#include <linux/slab.h> #ifndef INT_MAX #define INT_MAX 0x7fffffff @@ -681,9 +683,7 @@ STATIC int INIT bunzip2(unsigned char *buf, int len, set_error_fn(error_fn); if (flush) outbuf = malloc(BZIP2_IOBUF_SIZE); - else - len -= 4; /* Uncompressed size hack active in pre-boot - environment */ + if (!outbuf) { error("Could not allocate output bufer"); return -1; @@ -733,4 +733,14 @@ exit_0: return i; } -#define decompress bunzip2 +#ifdef PREBOOT +STATIC int INIT decompress(unsigned char *buf, int len, + int(*fill)(void*, unsigned int), + int(*flush)(void*, unsigned int), + unsigned char *outbuf, + int *pos, + void(*error_fn)(char *x)) +{ + return bunzip2(buf, len - 4, fill, flush, outbuf, pos, error_fn); +} +#endif diff --git a/lib/decompress_inflate.c b/lib/decompress_inflate.c index e36b296fc9f..68dfce59c1b 100644 --- a/lib/decompress_inflate.c +++ b/lib/decompress_inflate.c @@ -19,13 +19,13 @@ #include "zlib_inflate/inflate.h" #include "zlib_inflate/infutil.h" +#include <linux/slab.h> #endif /* STATIC */ #include <linux/decompress/mm.h> -#include <linux/slab.h> -#define INBUF_LEN (16*1024) +#define GZIP_IOBUF_SIZE (16*1024) /* Included from initramfs et al code */ STATIC int INIT gunzip(unsigned char *buf, int len, @@ -55,7 +55,7 @@ STATIC int INIT gunzip(unsigned char *buf, int len, if (buf) zbuf = buf; else { - zbuf = malloc(INBUF_LEN); + zbuf = malloc(GZIP_IOBUF_SIZE); len = 0; } if (!zbuf) { @@ -77,7 +77,7 @@ STATIC int INIT gunzip(unsigned char *buf, int len, } if (len == 0) - len = fill(zbuf, INBUF_LEN); + len = fill(zbuf, GZIP_IOBUF_SIZE); /* verify the gzip header */ if (len < 10 || @@ -113,7 +113,7 @@ STATIC int INIT gunzip(unsigned char *buf, int len, while (rc == Z_OK) { if (strm->avail_in == 0) { /* TODO: handle case where both pos and fill are set */ - len = fill(zbuf, INBUF_LEN); + len = fill(zbuf, GZIP_IOBUF_SIZE); if (len < 0) { rc = -1; error("read error"); diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c index 32123a1340e..0b954e04bd3 100644 --- a/lib/decompress_unlzma.c +++ b/lib/decompress_unlzma.c @@ -29,12 +29,14 @@ *Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ -#ifndef STATIC +#ifdef STATIC +#define PREBOOT +#else #include <linux/decompress/unlzma.h> +#include <linux/slab.h> #endif /* STATIC */ #include <linux/decompress/mm.h> -#include <linux/slab.h> #define MIN(a, b) (((a) < (b)) ? (a) : (b)) @@ -543,9 +545,7 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len, int ret = -1; set_error_fn(error_fn); - if (!flush) - in_len -= 4; /* Uncompressed size hack active in pre-boot - environment */ + if (buf) inbuf = buf; else @@ -645,4 +645,15 @@ exit_0: return ret; } -#define decompress unlzma +#ifdef PREBOOT +STATIC int INIT decompress(unsigned char *buf, int in_len, + int(*fill)(void*, unsigned int), + int(*flush)(void*, unsigned int), + unsigned char *output, + int *posp, + void(*error_fn)(char *x) + ) +{ + return unlzma(buf, in_len - 4, fill, flush, output, posp, error_fn); +} +#endif diff --git a/lib/dma-debug.c b/lib/dma-debug.c index ad65fc0317d..58a9f9fc609 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -156,9 +156,13 @@ static bool driver_filter(struct device *dev) return true; /* driver filter on and initialized */ - if (current_driver && dev->driver == current_driver) + if (current_driver && dev && dev->driver == current_driver) return true; + /* driver filter on, but we can't filter on a NULL device... */ + if (!dev) + return false; + if (current_driver || !current_driver_name[0]) return false; @@ -183,17 +187,17 @@ static bool driver_filter(struct device *dev) return ret; } -#define err_printk(dev, entry, format, arg...) do { \ - error_count += 1; \ - if (driver_filter(dev) && \ - (show_all_errors || show_num_errors > 0)) { \ - WARN(1, "%s %s: " format, \ - dev_driver_string(dev), \ - dev_name(dev) , ## arg); \ - dump_entry_trace(entry); \ - } \ - if (!show_all_errors && show_num_errors > 0) \ - show_num_errors -= 1; \ +#define err_printk(dev, entry, format, arg...) do { \ + error_count += 1; \ + if (driver_filter(dev) && \ + (show_all_errors || show_num_errors > 0)) { \ + WARN(1, "%s %s: " format, \ + dev ? dev_driver_string(dev) : "NULL", \ + dev ? dev_name(dev) : "NULL", ## arg); \ + dump_entry_trace(entry); \ + } \ + if (!show_all_errors && show_num_errors > 0) \ + show_num_errors -= 1; \ } while (0); /* @@ -262,11 +266,12 @@ static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket, */ matches += 1; match_lvl = 0; - entry->size == ref->size ? ++match_lvl : match_lvl; - entry->type == ref->type ? ++match_lvl : match_lvl; - entry->direction == ref->direction ? ++match_lvl : match_lvl; + entry->size == ref->size ? ++match_lvl : 0; + entry->type == ref->type ? ++match_lvl : 0; + entry->direction == ref->direction ? ++match_lvl : 0; + entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0; - if (match_lvl == 3) { + if (match_lvl == 4) { /* perfect-fit - return the result */ return entry; } else if (match_lvl > last_lvl) { @@ -715,7 +720,7 @@ void dma_debug_init(u32 num_entries) for (i = 0; i < HASH_SIZE; ++i) { INIT_LIST_HEAD(&dma_entry_hash[i].list); - dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; + spin_lock_init(&dma_entry_hash[i].lock); } if (dma_debug_fs_init() != 0) { @@ -855,90 +860,85 @@ static void check_for_stack(struct device *dev, void *addr) "stack [addr=%p]\n", addr); } -static inline bool overlap(void *addr, u64 size, void *start, void *end) +static inline bool overlap(void *addr, unsigned long len, void *start, void *end) { - void *addr2 = (char *)addr + size; + unsigned long a1 = (unsigned long)addr; + unsigned long b1 = a1 + len; + unsigned long a2 = (unsigned long)start; + unsigned long b2 = (unsigned long)end; - return ((addr >= start && addr < end) || - (addr2 >= start && addr2 < end) || - ((addr < start) && (addr2 >= end))); + return !(b1 <= a2 || a1 >= b2); } -static void check_for_illegal_area(struct device *dev, void *addr, u64 size) +static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len) { - if (overlap(addr, size, _text, _etext) || - overlap(addr, size, __start_rodata, __end_rodata)) - err_printk(dev, NULL, "DMA-API: device driver maps " - "memory from kernel text or rodata " - "[addr=%p] [size=%llu]\n", addr, size); + if (overlap(addr, len, _text, _etext) || + overlap(addr, len, __start_rodata, __end_rodata)) + err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len); } -static void check_sync(struct device *dev, dma_addr_t addr, - u64 size, u64 offset, int direction, bool to_cpu) +static void check_sync(struct device *dev, + struct dma_debug_entry *ref, + bool to_cpu) { - struct dma_debug_entry ref = { - .dev = dev, - .dev_addr = addr, - .size = size, - .direction = direction, - }; struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; - bucket = get_hash_bucket(&ref, &flags); + bucket = get_hash_bucket(ref, &flags); - entry = hash_bucket_find(bucket, &ref); + entry = hash_bucket_find(bucket, ref); if (!entry) { err_printk(dev, NULL, "DMA-API: device driver tries " "to sync DMA memory it has not allocated " "[device address=0x%016llx] [size=%llu bytes]\n", - (unsigned long long)addr, size); + (unsigned long long)ref->dev_addr, ref->size); goto out; } - if ((offset + size) > entry->size) { + if (ref->size > entry->size) { err_printk(dev, entry, "DMA-API: device driver syncs" " DMA memory outside allocated range " "[device address=0x%016llx] " - "[allocation size=%llu bytes] [sync offset=%llu] " - "[sync size=%llu]\n", entry->dev_addr, entry->size, - offset, size); + "[allocation size=%llu bytes] " + "[sync offset+size=%llu]\n", + entry->dev_addr, entry->size, + ref->size); } - if (direction != entry->direction) { + if (ref->direction != entry->direction) { err_printk(dev, entry, "DMA-API: device driver syncs " "DMA memory with different direction " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s]\n", - (unsigned long long)addr, entry->size, + (unsigned long long)ref->dev_addr, entry->size, dir2name[entry->direction], - dir2name[direction]); + dir2name[ref->direction]); } if (entry->direction == DMA_BIDIRECTIONAL) goto out; if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && - !(direction == DMA_TO_DEVICE)) + !(ref->direction == DMA_TO_DEVICE)) err_printk(dev, entry, "DMA-API: device driver syncs " "device read-only DMA memory for cpu " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s]\n", - (unsigned long long)addr, entry->size, + (unsigned long long)ref->dev_addr, entry->size, dir2name[entry->direction], - dir2name[direction]); + dir2name[ref->direction]); if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && - !(direction == DMA_FROM_DEVICE)) + !(ref->direction == DMA_FROM_DEVICE)) err_printk(dev, entry, "DMA-API: device driver syncs " "device write-only DMA memory to device " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s]\n", - (unsigned long long)addr, entry->size, + (unsigned long long)ref->dev_addr, entry->size, dir2name[entry->direction], - dir2name[direction]); + dir2name[ref->direction]); out: put_hash_bucket(bucket, &flags); @@ -972,7 +972,8 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, entry->type = dma_debug_single; if (!PageHighMem(page)) { - void *addr = ((char *)page_address(page)) + offset; + void *addr = page_address(page) + offset; + check_for_stack(dev, addr); check_for_illegal_area(dev, addr, size); } @@ -1036,19 +1037,16 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, } EXPORT_SYMBOL(debug_dma_map_sg); -static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s) +static int get_nr_mapped_entries(struct device *dev, + struct dma_debug_entry *ref) { - struct dma_debug_entry *entry, ref; + struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; int mapped_ents; - ref.dev = dev; - ref.dev_addr = sg_dma_address(s); - ref.size = sg_dma_len(s), - - bucket = get_hash_bucket(&ref, &flags); - entry = hash_bucket_find(bucket, &ref); + bucket = get_hash_bucket(ref, &flags); + entry = hash_bucket_find(bucket, ref); mapped_ents = 0; if (entry) @@ -1076,16 +1074,14 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, .dev_addr = sg_dma_address(s), .size = sg_dma_len(s), .direction = dir, - .sg_call_ents = 0, + .sg_call_ents = nelems, }; if (mapped_ents && i >= mapped_ents) break; - if (!i) { - ref.sg_call_ents = nelems; - mapped_ents = get_nr_mapped_entries(dev, s); - } + if (!i) + mapped_ents = get_nr_mapped_entries(dev, &ref); check_unmap(&ref); } @@ -1140,10 +1136,19 @@ EXPORT_SYMBOL(debug_dma_free_coherent); void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, int direction) { + struct dma_debug_entry ref; + if (unlikely(global_disable)) return; - check_sync(dev, dma_handle, size, 0, direction, true); + ref.type = dma_debug_single; + ref.dev = dev; + ref.dev_addr = dma_handle; + ref.size = size; + ref.direction = direction; + ref.sg_call_ents = 0; + + check_sync(dev, &ref, true); } EXPORT_SYMBOL(debug_dma_sync_single_for_cpu); @@ -1151,10 +1156,19 @@ void debug_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, int direction) { + struct dma_debug_entry ref; + if (unlikely(global_disable)) return; - check_sync(dev, dma_handle, size, 0, direction, false); + ref.type = dma_debug_single; + ref.dev = dev; + ref.dev_addr = dma_handle; + ref.size = size; + ref.direction = direction; + ref.sg_call_ents = 0; + + check_sync(dev, &ref, false); } EXPORT_SYMBOL(debug_dma_sync_single_for_device); @@ -1163,10 +1177,19 @@ void debug_dma_sync_single_range_for_cpu(struct device *dev, unsigned long offset, size_t size, int direction) { + struct dma_debug_entry ref; + if (unlikely(global_disable)) return; - check_sync(dev, dma_handle, size, offset, direction, true); + ref.type = dma_debug_single; + ref.dev = dev; + ref.dev_addr = dma_handle; + ref.size = offset + size; + ref.direction = direction; + ref.sg_call_ents = 0; + + check_sync(dev, &ref, true); } EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu); @@ -1175,10 +1198,19 @@ void debug_dma_sync_single_range_for_device(struct device *dev, unsigned long offset, size_t size, int direction) { + struct dma_debug_entry ref; + if (unlikely(global_disable)) return; - check_sync(dev, dma_handle, size, offset, direction, false); + ref.type = dma_debug_single; + ref.dev = dev; + ref.dev_addr = dma_handle; + ref.size = offset + size; + ref.direction = direction; + ref.sg_call_ents = 0; + + check_sync(dev, &ref, false); } EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); @@ -1192,14 +1224,24 @@ void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, return; for_each_sg(sg, s, nelems, i) { + + struct dma_debug_entry ref = { + .type = dma_debug_sg, + .dev = dev, + .paddr = sg_phys(s), + .dev_addr = sg_dma_address(s), + .size = sg_dma_len(s), + .direction = direction, + .sg_call_ents = nelems, + }; + if (!i) - mapped_ents = get_nr_mapped_entries(dev, s); + mapped_ents = get_nr_mapped_entries(dev, &ref); if (i >= mapped_ents) break; - check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0, - direction, true); + check_sync(dev, &ref, true); } } EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu); @@ -1214,14 +1256,23 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, return; for_each_sg(sg, s, nelems, i) { + + struct dma_debug_entry ref = { + .type = dma_debug_sg, + .dev = dev, + .paddr = sg_phys(s), + .dev_addr = sg_dma_address(s), + .size = sg_dma_len(s), + .direction = direction, + .sg_call_ents = nelems, + }; if (!i) - mapped_ents = get_nr_mapped_entries(dev, s); + mapped_ents = get_nr_mapped_entries(dev, &ref); if (i >= mapped_ents) break; - check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0, - direction, false); + check_sync(dev, &ref, false); } } EXPORT_SYMBOL(debug_dma_sync_sg_for_device); diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 833139ce1e2..e22c148e4b7 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -164,7 +164,7 @@ static void ddebug_change(const struct ddebug_query *query, if (!newflags) dt->num_enabled--; - else if (!dp-flags) + else if (!dp->flags) dt->num_enabled++; dp->flags = newflags; if (newflags) { diff --git a/lib/flex_array.c b/lib/flex_array.c new file mode 100644 index 00000000000..7baed2fc3bc --- /dev/null +++ b/lib/flex_array.c @@ -0,0 +1,268 @@ +/* + * Flexible array managed in PAGE_SIZE parts + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright IBM Corporation, 2009 + * + * Author: Dave Hansen <dave@linux.vnet.ibm.com> + */ + +#include <linux/flex_array.h> +#include <linux/slab.h> +#include <linux/stddef.h> + +struct flex_array_part { + char elements[FLEX_ARRAY_PART_SIZE]; +}; + +static inline int __elements_per_part(int element_size) +{ + return FLEX_ARRAY_PART_SIZE / element_size; +} + +static inline int bytes_left_in_base(void) +{ + int element_offset = offsetof(struct flex_array, parts); + int bytes_left = FLEX_ARRAY_BASE_SIZE - element_offset; + return bytes_left; +} + +static inline int nr_base_part_ptrs(void) +{ + return bytes_left_in_base() / sizeof(struct flex_array_part *); +} + +/* + * If a user requests an allocation which is small + * enough, we may simply use the space in the + * flex_array->parts[] array to store the user + * data. + */ +static inline int elements_fit_in_base(struct flex_array *fa) +{ + int data_size = fa->element_size * fa->total_nr_elements; + if (data_size <= bytes_left_in_base()) + return 1; + return 0; +} + +/** + * flex_array_alloc - allocate a new flexible array + * @element_size: the size of individual elements in the array + * @total: total number of elements that this should hold + * + * Note: all locking must be provided by the caller. + * + * @total is used to size internal structures. If the user ever + * accesses any array indexes >=@total, it will produce errors. + * + * The maximum number of elements is defined as: the number of + * elements that can be stored in a page times the number of + * page pointers that we can fit in the base structure or (using + * integer math): + * + * (PAGE_SIZE/element_size) * (PAGE_SIZE-8)/sizeof(void *) + * + * Here's a table showing example capacities. Note that the maximum + * index that the get/put() functions is just nr_objects-1. This + * basically means that you get 4MB of storage on 32-bit and 2MB on + * 64-bit. + * + * + * Element size | Objects | Objects | + * PAGE_SIZE=4k | 32-bit | 64-bit | + * ---------------------------------| + * 1 bytes | 4186112 | 2093056 | + * 2 bytes | 2093056 | 1046528 | + * 3 bytes | 1395030 | 697515 | + * 4 bytes | 1046528 | 523264 | + * 32 bytes | 130816 | 65408 | + * 33 bytes | 126728 | 63364 | + * 2048 bytes | 2044 | 1022 | + * 2049 bytes | 1022 | 511 | + * void * | 1046528 | 261632 | + * + * Since 64-bit pointers are twice the size, we lose half the + * capacity in the base structure. Also note that no effort is made + * to efficiently pack objects across page boundaries. + */ +struct flex_array *flex_array_alloc(int element_size, unsigned int total, + gfp_t flags) +{ + struct flex_array *ret; + int max_size = nr_base_part_ptrs() * __elements_per_part(element_size); + + /* max_size will end up 0 if element_size > PAGE_SIZE */ + if (total > max_size) + return NULL; + ret = kzalloc(sizeof(struct flex_array), flags); + if (!ret) + return NULL; + ret->element_size = element_size; + ret->total_nr_elements = total; + return ret; +} + +static int fa_element_to_part_nr(struct flex_array *fa, + unsigned int element_nr) +{ + return element_nr / __elements_per_part(fa->element_size); +} + +/** + * flex_array_free_parts - just free the second-level pages + * + * This is to be used in cases where the base 'struct flex_array' + * has been statically allocated and should not be free. + */ +void flex_array_free_parts(struct flex_array *fa) +{ + int part_nr; + int max_part = nr_base_part_ptrs(); + + if (elements_fit_in_base(fa)) + return; + for (part_nr = 0; part_nr < max_part; part_nr++) + kfree(fa->parts[part_nr]); +} + +void flex_array_free(struct flex_array *fa) +{ + flex_array_free_parts(fa); + kfree(fa); +} + +static unsigned int index_inside_part(struct flex_array *fa, + unsigned int element_nr) +{ + unsigned int part_offset; + + part_offset = element_nr % __elements_per_part(fa->element_size); + return part_offset * fa->element_size; +} + +static struct flex_array_part * +__fa_get_part(struct flex_array *fa, int part_nr, gfp_t flags) +{ + struct flex_array_part *part = fa->parts[part_nr]; + if (!part) { + /* + * This leaves the part pages uninitialized + * and with potentially random data, just + * as if the user had kmalloc()'d the whole. + * __GFP_ZERO can be used to zero it. + */ + part = kmalloc(FLEX_ARRAY_PART_SIZE, flags); + if (!part) + return NULL; + fa->parts[part_nr] = part; + } + return part; +} + +/** + * flex_array_put - copy data into the array at @element_nr + * @src: address of data to copy into the array + * @element_nr: index of the position in which to insert + * the new element. + * + * Note that this *copies* the contents of @src into + * the array. If you are trying to store an array of + * pointers, make sure to pass in &ptr instead of ptr. + * + * Locking must be provided by the caller. + */ +int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src, + gfp_t flags) +{ + int part_nr = fa_element_to_part_nr(fa, element_nr); + struct flex_array_part *part; + void *dst; + + if (element_nr >= fa->total_nr_elements) + return -ENOSPC; + if (elements_fit_in_base(fa)) + part = (struct flex_array_part *)&fa->parts[0]; + else { + part = __fa_get_part(fa, part_nr, flags); + if (!part) + return -ENOMEM; + } + dst = &part->elements[index_inside_part(fa, element_nr)]; + memcpy(dst, src, fa->element_size); + return 0; +} + +/** + * flex_array_prealloc - guarantee that array space exists + * @start: index of first array element for which space is allocated + * @end: index of last (inclusive) element for which space is allocated + * + * This will guarantee that no future calls to flex_array_put() + * will allocate memory. It can be used if you are expecting to + * be holding a lock or in some atomic context while writing + * data into the array. + * + * Locking must be provided by the caller. + */ +int flex_array_prealloc(struct flex_array *fa, unsigned int start, + unsigned int end, gfp_t flags) +{ + int start_part; + int end_part; + int part_nr; + struct flex_array_part *part; + + if (start >= fa->total_nr_elements || end >= fa->total_nr_elements) + return -ENOSPC; + if (elements_fit_in_base(fa)) + return 0; + start_part = fa_element_to_part_nr(fa, start); + end_part = fa_element_to_part_nr(fa, end); + for (part_nr = start_part; part_nr <= end_part; part_nr++) { + part = __fa_get_part(fa, part_nr, flags); + if (!part) + return -ENOMEM; + } + return 0; +} + +/** + * flex_array_get - pull data back out of the array + * @element_nr: index of the element to fetch from the array + * + * Returns a pointer to the data at index @element_nr. Note + * that this is a copy of the data that was passed in. If you + * are using this to store pointers, you'll get back &ptr. + * + * Locking must be provided by the caller. + */ +void *flex_array_get(struct flex_array *fa, unsigned int element_nr) +{ + int part_nr = fa_element_to_part_nr(fa, element_nr); + struct flex_array_part *part; + + if (element_nr >= fa->total_nr_elements) + return NULL; + if (elements_fit_in_base(fa)) + part = (struct flex_array_part *)&fa->parts[0]; + else { + part = fa->parts[part_nr]; + if (!part) + return NULL; + } + return &part->elements[index_inside_part(fa, element_nr)]; +} diff --git a/lib/gcd.c b/lib/gcd.c new file mode 100644 index 00000000000..f879033d982 --- /dev/null +++ b/lib/gcd.c @@ -0,0 +1,18 @@ +#include <linux/kernel.h> +#include <linux/gcd.h> +#include <linux/module.h> + +/* Greatest common divisor */ +unsigned long gcd(unsigned long a, unsigned long b) +{ + unsigned long r; + + if (a < b) + swap(a, b); + while ((r = a % b) != 0) { + a = b; + b = r; + } + return b; +} +EXPORT_SYMBOL_GPL(gcd); diff --git a/lib/lmb.c b/lib/lmb.c index e4a6482d8b2..0343c05609f 100644 --- a/lib/lmb.c +++ b/lib/lmb.c @@ -429,7 +429,7 @@ u64 __init lmb_phys_mem_size(void) return lmb.memory.size; } -u64 __init lmb_end_of_DRAM(void) +u64 lmb_end_of_DRAM(void) { int idx = lmb.memory.cnt - 1; diff --git a/lib/scatterlist.c b/lib/scatterlist.c index a295e404e90..0d475d8167b 100644 --- a/lib/scatterlist.c +++ b/lib/scatterlist.c @@ -314,6 +314,7 @@ void sg_miter_start(struct sg_mapping_iter *miter, struct scatterlist *sgl, miter->__sg = sgl; miter->__nents = nents; miter->__offset = 0; + WARN_ON(!(flags & (SG_MITER_TO_SG | SG_MITER_FROM_SG))); miter->__flags = flags; } EXPORT_SYMBOL(sg_miter_start); @@ -394,6 +395,9 @@ void sg_miter_stop(struct sg_mapping_iter *miter) if (miter->addr) { miter->__offset += miter->consumed; + if (miter->__flags & SG_MITER_TO_SG) + flush_kernel_dcache_page(miter->page); + if (miter->__flags & SG_MITER_ATOMIC) { WARN_ON(!irqs_disabled()); kunmap_atomic(miter->addr, KM_BIO_SRC_IRQ); @@ -426,8 +430,14 @@ static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, unsigned int offset = 0; struct sg_mapping_iter miter; unsigned long flags; + unsigned int sg_flags = SG_MITER_ATOMIC; + + if (to_buffer) + sg_flags |= SG_MITER_FROM_SG; + else + sg_flags |= SG_MITER_TO_SG; - sg_miter_start(&miter, sgl, nents, SG_MITER_ATOMIC); + sg_miter_start(&miter, sgl, nents, sg_flags); local_irq_save(flags); @@ -438,10 +448,8 @@ static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, if (to_buffer) memcpy(buf + offset, miter.addr, len); - else { + else memcpy(miter.addr, buf + offset, len); - flush_kernel_dcache_page(miter.page); - } offset += len; } |