diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 62 | ||||
| -rw-r--r-- | lib/atomic64_test.c | 2 | ||||
| -rw-r--r-- | lib/devres.c | 2 | ||||
| -rw-r--r-- | lib/random32.c | 2 | ||||
| -rw-r--r-- | lib/swiotlb.c | 137 | ||||
| -rw-r--r-- | lib/vsprintf.c | 9 |
6 files changed, 136 insertions, 78 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index e722e9d..ff87ddc 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -152,28 +152,33 @@ config DEBUG_SHIRQ Drivers ought to be able to handle interrupts coming in at those points; some don't and need to be caught. -config DETECT_SOFTLOCKUP - bool "Detect Soft Lockups" +config LOCKUP_DETECTOR + bool "Detect Hard and Soft Lockups" depends on DEBUG_KERNEL && !S390 - default y help - Say Y here to enable the kernel to detect "soft lockups", - which are bugs that cause the kernel to loop in kernel + Say Y here to enable the kernel to act as a watchdog to detect + hard and soft lockups. + + Softlockups are bugs that cause the kernel to loop in kernel mode for more than 60 seconds, without giving other tasks a - chance to run. + chance to run. The current stack trace is displayed upon + detection and the system will stay locked up. - When a soft-lockup is detected, the kernel will print the - current stack trace (which you should report), but the - system will stay locked up. This feature has negligible - overhead. + Hardlockups are bugs that cause the CPU to loop in kernel mode + for more than 60 seconds, without letting other interrupts have a + chance to run. The current stack trace is displayed upon detection + and the system will stay locked up. - (Note that "hard lockups" are separate type of bugs that - can be detected via the NMI-watchdog, on platforms that - support it.) + The overhead should be minimal. A periodic hrtimer runs to + generate interrupts and kick the watchdog task every 10-12 seconds. + An NMI is generated every 60 seconds or so to check for hardlockups. + +config HARDLOCKUP_DETECTOR + def_bool LOCKUP_DETECTOR && PERF_EVENTS && HAVE_PERF_EVENTS_NMI config BOOTPARAM_SOFTLOCKUP_PANIC bool "Panic (Reboot) On Soft Lockups" - depends on DETECT_SOFTLOCKUP + depends on LOCKUP_DETECTOR help Say Y here to enable the kernel to panic on "soft lockups", which are bugs that cause the kernel to loop in kernel @@ -190,7 +195,7 @@ config BOOTPARAM_SOFTLOCKUP_PANIC config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE int - depends on DETECT_SOFTLOCKUP + depends on LOCKUP_DETECTOR range 0 1 default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC default 1 if BOOTPARAM_SOFTLOCKUP_PANIC @@ -307,6 +312,12 @@ config DEBUG_OBJECTS_WORK work queue routines to track the life time of work objects and validate the work operations. +config DEBUG_OBJECTS_RCU_HEAD + bool "Debug RCU callbacks objects" + depends on DEBUG_OBJECTS && PREEMPT + help + Enable this to turn on debugging of RCU list heads (call_rcu() usage). + config DEBUG_OBJECTS_ENABLE_DEFAULT int "debug_objects bootup default value (0-1)" range 0 1 @@ -528,7 +539,7 @@ config LOCKDEP bool depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT select STACKTRACE - select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 + select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE select KALLSYMS select KALLSYMS_ALL @@ -628,6 +639,19 @@ config DEBUG_INFO If unsure, say N. +config DEBUG_INFO_REDUCED + bool "Reduce debugging information" + depends on DEBUG_INFO + help + If you say Y here gcc is instructed to generate less debugging + information for structure types. This means that tools that + need full debugging information (like kgdb or systemtap) won't + be happy. But if you merely need debugging information to + resolve line numbers there is no loss. Advantage is that + build directory object sizes shrink dramatically over a full + DEBUG_INFO build and compile times are reduced too. + Only works with newer gcc versions. + config DEBUG_VM bool "Debug VM" depends on DEBUG_KERNEL @@ -937,7 +961,7 @@ config FAIL_MAKE_REQUEST Provide fault-injection capability for disk IO. config FAIL_IO_TIMEOUT - bool "Faul-injection capability for faking disk interrupts" + bool "Fault-injection capability for faking disk interrupts" depends on FAULT_INJECTION && BLOCK help Provide fault-injection capability on end IO handling. This @@ -958,13 +982,13 @@ config FAULT_INJECTION_STACKTRACE_FILTER depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT depends on !X86_64 select STACKTRACE - select FRAME_POINTER if !PPC && !S390 + select FRAME_POINTER if !PPC && !S390 && !MICROBLAZE help Provide stacktrace filter for fault-injection capabilities config LATENCYTOP bool "Latency measuring infrastructure" - select FRAME_POINTER if !MIPS && !PPC && !S390 + select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE select KALLSYMS select KALLSYMS_ALL select STACKTRACE diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c index 250ed11..44524cc 100644 --- a/lib/atomic64_test.c +++ b/lib/atomic64_test.c @@ -114,7 +114,7 @@ static __init int test_atomic64(void) BUG_ON(v.counter != r); #if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \ - defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) + defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM) INIT(onestwos); BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1)); r -= one; diff --git a/lib/devres.c b/lib/devres.c index 4936860..6efddf5 100644 --- a/lib/devres.c +++ b/lib/devres.c @@ -328,7 +328,7 @@ EXPORT_SYMBOL(pcim_iomap_regions_request_all); * @pdev: PCI device to map IO resources for * @mask: Mask of BARs to unmap and release * - * Unamp and release regions specified by @mask. + * Unmap and release regions specified by @mask. */ void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask) { diff --git a/lib/random32.c b/lib/random32.c index 870dc3f..fc3545a 100644 --- a/lib/random32.c +++ b/lib/random32.c @@ -127,7 +127,7 @@ core_initcall(random32_init); /* * Generate better values after random number generator - * is fully initalized. + * is fully initialized. */ static int __init random32_reseed(void) { diff --git a/lib/swiotlb.c b/lib/swiotlb.c index a009055..34e3082 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -50,19 +50,11 @@ */ #define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT) -/* - * Enumeration for sync targets - */ -enum dma_sync_target { - SYNC_FOR_CPU = 0, - SYNC_FOR_DEVICE = 1, -}; - int swiotlb_force; /* - * Used to do a quick range check in unmap_single and - * sync_single_*, to see if the memory was in fact allocated by this + * Used to do a quick range check in swiotlb_tbl_unmap_single and + * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this * API. */ static char *io_tlb_start, *io_tlb_end; @@ -140,28 +132,14 @@ void swiotlb_print_info(void) (unsigned long long)pend); } -/* - * Statically reserve bounce buffer space and initialize bounce buffer data - * structures for the software IO TLB used to implement the DMA API. - */ -void __init -swiotlb_init_with_default_size(size_t default_size, int verbose) +void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) { unsigned long i, bytes; - if (!io_tlb_nslabs) { - io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); - io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); - } - - bytes = io_tlb_nslabs << IO_TLB_SHIFT; + bytes = nslabs << IO_TLB_SHIFT; - /* - * Get IO TLB memory from the low pages - */ - io_tlb_start = alloc_bootmem_low_pages(bytes); - if (!io_tlb_start) - panic("Cannot allocate SWIOTLB buffer"); + io_tlb_nslabs = nslabs; + io_tlb_start = tlb; io_tlb_end = io_tlb_start + bytes; /* @@ -185,6 +163,32 @@ swiotlb_init_with_default_size(size_t default_size, int verbose) swiotlb_print_info(); } +/* + * Statically reserve bounce buffer space and initialize bounce buffer data + * structures for the software IO TLB used to implement the DMA API. + */ +void __init +swiotlb_init_with_default_size(size_t default_size, int verbose) +{ + unsigned long bytes; + + if (!io_tlb_nslabs) { + io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); + io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); + } + + bytes = io_tlb_nslabs << IO_TLB_SHIFT; + + /* + * Get IO TLB memory from the low pages + */ + io_tlb_start = alloc_bootmem_low_pages(bytes); + if (!io_tlb_start) + panic("Cannot allocate SWIOTLB buffer"); + + swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose); +} + void __init swiotlb_init(int verbose) { @@ -323,8 +327,8 @@ static int is_swiotlb_buffer(phys_addr_t paddr) /* * Bounce: copy the swiotlb buffer back to the original dma location */ -static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, - enum dma_data_direction dir) +void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, + enum dma_data_direction dir) { unsigned long pfn = PFN_DOWN(phys); @@ -360,26 +364,25 @@ static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, memcpy(phys_to_virt(phys), dma_addr, size); } } +EXPORT_SYMBOL_GPL(swiotlb_bounce); -/* - * Allocates bounce buffer and returns its kernel virtual address. - */ -static void * -map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir) +void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr, + phys_addr_t phys, size_t size, + enum dma_data_direction dir) { unsigned long flags; char *dma_addr; unsigned int nslots, stride, index, wrap; int i; - unsigned long start_dma_addr; unsigned long mask; unsigned long offset_slots; unsigned long max_slots; mask = dma_get_seg_boundary(hwdev); - start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask; - offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; + tbl_dma_addr &= mask; + + offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; /* * Carefully handle integer overflow which can occur when mask == ~0UL. @@ -466,12 +469,27 @@ found: return dma_addr; } +EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single); + +/* + * Allocates bounce buffer and returns its kernel virtual address. + */ + +static void * +map_single(struct device *hwdev, phys_addr_t phys, size_t size, + enum dma_data_direction dir) +{ + dma_addr_t start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start); + + return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, dir); +} /* * dma_addr is the kernel virtual address of the bounce buffer to unmap. */ -static void -do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) +void +swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size, + enum dma_data_direction dir) { unsigned long flags; int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; @@ -509,10 +527,12 @@ do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) } spin_unlock_irqrestore(&io_tlb_lock, flags); } +EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single); -static void -sync_single(struct device *hwdev, char *dma_addr, size_t size, - int dir, int target) +void +swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size, + enum dma_data_direction dir, + enum dma_sync_target target) { int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; phys_addr_t phys = io_tlb_orig_addr[index]; @@ -536,6 +556,7 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size, BUG(); } } +EXPORT_SYMBOL_GPL(swiotlb_tbl_sync_single); void * swiotlb_alloc_coherent(struct device *hwdev, size_t size, @@ -559,8 +580,8 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size, } if (!ret) { /* - * We are either out of memory or the device can't DMA - * to GFP_DMA memory; fall back on map_single(), which + * We are either out of memory or the device can't DMA to + * GFP_DMA memory; fall back on map_single(), which * will grab memory from the lowest available address range. */ ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE); @@ -578,7 +599,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size, (unsigned long long)dev_addr); /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ - do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE); + swiotlb_tbl_unmap_single(hwdev, ret, size, DMA_TO_DEVICE); return NULL; } *dma_handle = dev_addr; @@ -596,13 +617,14 @@ swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, if (!is_swiotlb_buffer(paddr)) free_pages((unsigned long)vaddr, get_order(size)); else - /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ - do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE); + /* DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single */ + swiotlb_tbl_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE); } EXPORT_SYMBOL(swiotlb_free_coherent); static void -swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) +swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir, + int do_panic) { /* * Ran out of IOMMU space for this operation. This is very bad. @@ -680,14 +702,14 @@ EXPORT_SYMBOL_GPL(swiotlb_map_page); * whatever the device wrote there. */ static void unmap_single(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir) + size_t size, enum dma_data_direction dir) { phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); BUG_ON(dir == DMA_NONE); if (is_swiotlb_buffer(paddr)) { - do_unmap_single(hwdev, phys_to_virt(paddr), size, dir); + swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir); return; } @@ -723,14 +745,16 @@ EXPORT_SYMBOL_GPL(swiotlb_unmap_page); */ static void swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir, int target) + size_t size, enum dma_data_direction dir, + enum dma_sync_target target) { phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); BUG_ON(dir == DMA_NONE); if (is_swiotlb_buffer(paddr)) { - sync_single(hwdev, phys_to_virt(paddr), size, dir, target); + swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir, + target); return; } @@ -809,7 +833,7 @@ EXPORT_SYMBOL(swiotlb_map_sg_attrs); int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, - int dir) + enum dma_data_direction dir) { return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL); } @@ -836,7 +860,7 @@ EXPORT_SYMBOL(swiotlb_unmap_sg_attrs); void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, - int dir) + enum dma_data_direction dir) { return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL); } @@ -851,7 +875,8 @@ EXPORT_SYMBOL(swiotlb_unmap_sg); */ static void swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl, - int nelems, int dir, int target) + int nelems, enum dma_data_direction dir, + enum dma_sync_target target) { struct scatterlist *sg; int i; diff --git a/lib/vsprintf.c b/lib/vsprintf.c index b8a2f54..4ee19d0 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -980,6 +980,11 @@ char *uuid_string(char *buf, char *end, const u8 *addr, * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] * little endian output byte order is: * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] + * - 'V' For a struct va_format which contains a format string * and va_list *, + * call vsnprintf(->format, *->va_list). + * Implements a "recursive vsnprintf". + * Do not use this feature without some mechanism to verify the + * correctness of the format string and va_list arguments. * * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 * function pointers are really function descriptors, which contain a @@ -1025,6 +1030,10 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, break; case 'U': return uuid_string(buf, end, ptr, spec, fmt); + case 'V': + return buf + vsnprintf(buf, end - buf, + ((struct va_format *)ptr)->fmt, + *(((struct va_format *)ptr)->va)); } spec.flags |= SMALL; if (spec.field_width == -1) { |
