diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/Makefile | 2 | ||||
| -rw-r--r-- | drivers/base/core.c | 34 | ||||
| -rw-r--r-- | drivers/base/firmware_class.c | 7 | ||||
| -rw-r--r-- | drivers/base/memory.c | 197 | ||||
| -rw-r--r-- | drivers/base/node.c | 12 | ||||
| -rw-r--r-- | drivers/base/power/Makefile | 3 | ||||
| -rw-r--r-- | drivers/base/power/main.c | 175 | ||||
| -rw-r--r-- | drivers/base/power/opp.c | 2 | ||||
| -rw-r--r-- | drivers/base/power/power.h | 21 | ||||
| -rw-r--r-- | drivers/base/power/runtime.c | 37 | ||||
| -rw-r--r-- | drivers/base/power/sysfs.c | 78 | ||||
| -rw-r--r-- | drivers/base/power/trace.c | 6 | ||||
| -rw-r--r-- | drivers/base/power/wakeup.c | 109 | ||||
| -rw-r--r-- | drivers/base/sys.c | 65 | ||||
| -rw-r--r-- | drivers/base/syscore.c | 117 |
15 files changed, 611 insertions, 254 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 5f51c3b..4c5701c 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -1,6 +1,6 @@ # Makefile for the Linux device tree -obj-y := core.o sys.o bus.o dd.o \ +obj-y := core.o sys.o bus.o dd.o syscore.o \ driver.o class.o platform.o \ cpu.o firmware.o init.o map.o devres.o \ attribute_container.o transport_class.o diff --git a/drivers/base/core.c b/drivers/base/core.c index 080e9ca..81b78ed 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1320,7 +1320,10 @@ struct root_device struct module *owner; }; -#define to_root_device(dev) container_of(dev, struct root_device, dev) +inline struct root_device *to_root_device(struct device *d) +{ + return container_of(d, struct root_device, dev); +} static void root_device_release(struct device *dev) { @@ -1551,7 +1554,34 @@ EXPORT_SYMBOL_GPL(device_destroy); * on the same device to ensure that new_name is valid and * won't conflict with other devices. * - * "Never use this function, bad things will happen" - gregkh + * Note: Don't call this function. Currently, the networking layer calls this + * function, but that will change. The following text from Kay Sievers offers + * some insight: + * + * Renaming devices is racy at many levels, symlinks and other stuff are not + * replaced atomically, and you get a "move" uevent, but it's not easy to + * connect the event to the old and new device. Device nodes are not renamed at + * all, there isn't even support for that in the kernel now. + * + * In the meantime, during renaming, your target name might be taken by another + * driver, creating conflicts. Or the old name is taken directly after you + * renamed it -- then you get events for the same DEVPATH, before you even see + * the "move" event. It's just a mess, and nothing new should ever rely on + * kernel device renaming. Besides that, it's not even implemented now for + * other things than (driver-core wise very simple) network devices. + * + * We are currently about to change network renaming in udev to completely + * disallow renaming of devices in the same namespace as the kernel uses, + * because we can't solve the problems properly, that arise with swapping names + * of multiple interfaces without races. Means, renaming of eth[0-9]* will only + * be allowed to some other name than eth[0-9]*, for the aforementioned + * reasons. + * + * Make up a "real" name in the driver before you register anything, or add + * some other attributes for userspace to find the device, or use udev to add + * symlinks -- but never rename kernel devices later, it's a complete mess. We + * don't even want to get into that and try to implement the missing pieces in + * the core. We really have other pieces to fix in the driver core mess. :) */ int device_rename(struct device *dev, const char *new_name) { diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 40af43e..8c798ef 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -593,8 +593,7 @@ int request_firmware(const struct firmware **firmware_p, const char *name, struct device *device) { - int uevent = 1; - return _request_firmware(firmware_p, name, device, uevent, false); + return _request_firmware(firmware_p, name, device, true, false); } /** @@ -618,7 +617,7 @@ struct firmware_work { struct device *device; void *context; void (*cont)(const struct firmware *fw, void *context); - int uevent; + bool uevent; }; static int request_firmware_work_func(void *arg) @@ -661,7 +660,7 @@ static int request_firmware_work_func(void *arg) **/ int request_firmware_nowait( - struct module *module, int uevent, + struct module *module, bool uevent, const char *name, struct device *device, gfp_t gfp, void *context, void (*cont)(const struct firmware *fw, void *context)) { diff --git a/drivers/base/memory.c b/drivers/base/memory.c index cafeaaf..3da6a43 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -30,6 +30,14 @@ static DEFINE_MUTEX(mem_sysfs_mutex); #define MEMORY_CLASS_NAME "memory" +#define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS) + +static int sections_per_block; + +static inline int base_memory_block_id(int section_nr) +{ + return section_nr / sections_per_block; +} static struct sysdev_class memory_sysdev_class = { .name = MEMORY_CLASS_NAME, @@ -84,39 +92,72 @@ EXPORT_SYMBOL(unregister_memory_isolate_notifier); * register_memory - Setup a sysfs device for a memory block */ static -int register_memory(struct memory_block *memory, struct mem_section *section) +int register_memory(struct memory_block *memory) { int error; memory->sysdev.cls = &memory_sysdev_class; - memory->sysdev.id = __section_nr(section); + memory->sysdev.id = memory->start_section_nr / sections_per_block; error = sysdev_register(&memory->sysdev); return error; } static void -unregister_memory(struct memory_block *memory, struct mem_section *section) +unregister_memory(struct memory_block *memory) { BUG_ON(memory->sysdev.cls != &memory_sysdev_class); - BUG_ON(memory->sysdev.id != __section_nr(section)); /* drop the ref. we got in remove_memory_block() */ kobject_put(&memory->sysdev.kobj); sysdev_unregister(&memory->sysdev); } +unsigned long __weak memory_block_size_bytes(void) +{ + return MIN_MEMORY_BLOCK_SIZE; +} + +static unsigned long get_memory_block_size(void) +{ + unsigned long block_sz; + + block_sz = memory_block_size_bytes(); + + /* Validate blk_sz is a power of 2 and not less than section size */ + if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { + WARN_ON(1); + block_sz = MIN_MEMORY_BLOCK_SIZE; + } + + return block_sz; +} + /* * use this as the physical section index that this memsection * uses. */ -static ssize_t show_mem_phys_index(struct sys_device *dev, +static ssize_t show_mem_start_phys_index(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) { struct memory_block *mem = container_of(dev, struct memory_block, sysdev); - return sprintf(buf, "%08lx\n", mem->phys_index); + unsigned long phys_index; + + phys_index = mem->start_section_nr / sections_per_block; + return sprintf(buf, "%08lx\n", phys_index); +} + +static ssize_t show_mem_end_phys_index(struct sys_device *dev, + struct sysdev_attribute *attr, char *buf) +{ + struct memory_block *mem = + container_of(dev, struct memory_block, sysdev); + unsigned long phys_index; + + phys_index = mem->end_section_nr / sections_per_block; + return sprintf(buf, "%08lx\n", phys_index); } /* @@ -125,13 +166,16 @@ static ssize_t show_mem_phys_index(struct sys_device *dev, static ssize_t show_mem_removable(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) { - unsigned long start_pfn; - int ret; + unsigned long i, pfn; + int ret = 1; struct memory_block *mem = container_of(dev, struct memory_block, sysdev); - start_pfn = section_nr_to_pfn(mem->phys_index); - ret = is_mem_section_removable(start_pfn, PAGES_PER_SECTION); + for (i = 0; i < sections_per_block; i++) { + pfn = section_nr_to_pfn(mem->start_section_nr + i); + ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); + } + return sprintf(buf, "%d\n", ret); } @@ -184,17 +228,14 @@ int memory_isolate_notify(unsigned long val, void *v) * OK to have direct references to sparsemem variables in here. */ static int -memory_block_action(struct memory_block *mem, unsigned long action) +memory_section_action(unsigned long phys_index, unsigned long action) { int i; - unsigned long psection; unsigned long start_pfn, start_paddr; struct page *first_page; int ret; - int old_state = mem->state; - psection = mem->phys_index; - first_page = pfn_to_page(psection << PFN_SECTION_SHIFT); + first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); /* * The probe routines leave the pages reserved, just @@ -207,8 +248,8 @@ memory_block_action(struct memory_block *mem, unsigned long action) continue; printk(KERN_WARNING "section number %ld page number %d " - "not reserved, was it already online? \n", - psection, i); + "not reserved, was it already online?\n", + phys_index, i); return -EBUSY; } } @@ -219,18 +260,13 @@ memory_block_action(struct memory_block *mem, unsigned long action) ret = online_pages(start_pfn, PAGES_PER_SECTION); break; case MEM_OFFLINE: - mem->state = MEM_GOING_OFFLINE; start_paddr = page_to_pfn(first_page) << PAGE_SHIFT; ret = remove_memory(start_paddr, PAGES_PER_SECTION << PAGE_SHIFT); - if (ret) { - mem->state = old_state; - break; - } break; default: - WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n", - __func__, mem, action, action); + WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " + "%ld\n", __func__, phys_index, action, action); ret = -EINVAL; } @@ -240,7 +276,8 @@ memory_block_action(struct memory_block *mem, unsigned long action) static int memory_block_change_state(struct memory_block *mem, unsigned long to_state, unsigned long from_state_req) { - int ret = 0; + int i, ret = 0; + mutex_lock(&mem->state_mutex); if (mem->state != from_state_req) { @@ -248,8 +285,23 @@ static int memory_block_change_state(struct memory_block *mem, goto out; } - ret = memory_block_action(mem, to_state); - if (!ret) + if (to_state == MEM_OFFLINE) + mem->state = MEM_GOING_OFFLINE; + + for (i = 0; i < sections_per_block; i++) { + ret = memory_section_action(mem->start_section_nr + i, + to_state); + if (ret) + break; + } + + if (ret) { + for (i = 0; i < sections_per_block; i++) + memory_section_action(mem->start_section_nr + i, + from_state_req); + + mem->state = from_state_req; + } else mem->state = to_state; out: @@ -262,20 +314,15 @@ store_mem_state(struct sys_device *dev, struct sysdev_attribute *attr, const char *buf, size_t count) { struct memory_block *mem; - unsigned int phys_section_nr; int ret = -EINVAL; mem = container_of(dev, struct memory_block, sysdev); - phys_section_nr = mem->phys_index; - - if (!present_section_nr(phys_section_nr)) - goto out; if (!strncmp(buf, "online", min((int)count, 6))) ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); else if(!strncmp(buf, "offline", min((int)count, 7))) ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); -out: + if (ret) return ret; return count; @@ -298,7 +345,8 @@ static ssize_t show_phys_device(struct sys_device *dev, return sprintf(buf, "%d\n", mem->phys_device); } -static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL); +static SYSDEV_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); +static SYSDEV_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state); static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL); static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL); @@ -315,7 +363,7 @@ static ssize_t print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr, char *buf) { - return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE); + return sprintf(buf, "%lx\n", get_memory_block_size()); } static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL); @@ -339,12 +387,19 @@ memory_probe_store(struct class *class, struct class_attribute *attr, { u64 phys_addr; int nid; - int ret; + int i, ret; phys_addr = simple_strtoull(buf, NULL, 0); - nid = memory_add_physaddr_to_nid(phys_addr); - ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT); + for (i = 0; i < sections_per_block; i++) { + nid = memory_add_physaddr_to_nid(phys_addr); + ret = add_memory(nid, phys_addr, + PAGES_PER_SECTION << PAGE_SHIFT); + if (ret) + break; + + phys_addr += MIN_MEMORY_BLOCK_SIZE; + } if (ret) count = ret; @@ -444,6 +499,7 @@ struct memory_block *find_memory_block_hinted(struct mem_section *section, struct sys_device *sysdev; struct memory_block *mem; char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1]; + int block_id = base_memory_block_id(__section_nr(section)); kobj = hint ? &hint->sysdev.kobj : NULL; @@ -451,7 +507,7 @@ struct memory_block *find_memory_block_hinted(struct mem_section *section, * This only works because we know that section == sysdev->id * slightly redundant with sysdev_register() */ - sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section)); + sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, block_id); kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj); if (!kobj) @@ -476,36 +532,62 @@ struct memory_block *find_memory_block(struct mem_section *section) return find_memory_block_hinted(section, NULL); } -static int add_memory_block(int nid, struct mem_section *section, - unsigned long state, enum mem_add_context context) +static int init_memory_block(struct memory_block **memory, + struct mem_section *section, unsigned long state) { - struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL); + struct memory_block *mem; unsigned long start_pfn; + int scn_nr; int ret = 0; + mem = kzalloc(sizeof(*mem), GFP_KERNEL); if (!mem) return -ENOMEM; - mutex_lock(&mem_sysfs_mutex); - - mem->phys_index = __section_nr(section); + scn_nr = __section_nr(section); + mem->start_section_nr = + base_memory_block_id(scn_nr) * sections_per_block; + mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; mem->state = state; mem->section_count++; mutex_init(&mem->state_mutex); - start_pfn = section_nr_to_pfn(mem->phys_index); + start_pfn = section_nr_to_pfn(mem->start_section_nr); mem->phys_device = arch_get_memory_phys_device(start_pfn); - ret = register_memory(mem, section); + ret = register_memory(mem); if (!ret) ret = mem_create_simple_file(mem, phys_index); if (!ret) + ret = mem_create_simple_file(mem, end_phys_index); + if (!ret) ret = mem_create_simple_file(mem, state); if (!ret) ret = mem_create_simple_file(mem, phys_device); if (!ret) ret = mem_create_simple_file(mem, removable); + + *memory = mem; + return ret; +} + +static int add_memory_section(int nid, struct mem_section *section, + unsigned long state, enum mem_add_context context) +{ + struct memory_block *mem; + int ret = 0; + + mutex_lock(&mem_sysfs_mutex); + + mem = find_memory_block(section); + if (mem) { + mem->section_count++; + kobject_put(&mem->sysdev.kobj); + } else + ret = init_memory_block(&mem, section, state); + if (!ret) { - if (context == HOTPLUG) + if (context == HOTPLUG && + mem->section_count == sections_per_block) ret = register_mem_sect_under_node(mem, nid); } @@ -520,16 +602,19 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section, mutex_lock(&mem_sysfs_mutex); mem = find_memory_block(section); + unregister_mem_sect_under_nodes(mem, __section_nr(section)); mem->section_count--; if (mem->section_count == 0) { - unregister_mem_sect_under_nodes(mem); mem_remove_simple_file(mem, phys_index); + mem_remove_simple_file(mem, end_phys_index); mem_remove_simple_file(mem, state); mem_remove_simple_file(mem, phys_device); mem_remove_simple_file(mem, removable); - unregister_memory(mem, section); - } + unregister_memory(mem); + kfree(mem); + } else + kobject_put(&mem->sysdev.kobj); mutex_unlock(&mem_sysfs_mutex); return 0; @@ -541,7 +626,7 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section, */ int register_new_memory(int nid, struct mem_section *section) { - return add_memory_block(nid, section, MEM_OFFLINE, HOTPLUG); + return add_memory_section(nid, section, MEM_OFFLINE, HOTPLUG); } int unregister_memory_section(struct mem_section *section) @@ -560,12 +645,16 @@ int __init memory_dev_init(void) unsigned int i; int ret; int err; + unsigned long block_sz; memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops; ret = sysdev_class_register(&memory_sysdev_class); if (ret) goto out; + block_sz = get_memory_block_size(); + sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; + /* * Create entries for memory sections that were found * during boot and have been initialized @@ -573,8 +662,8 @@ int __init memory_dev_init(void) for (i = 0; i < NR_MEM_SECTIONS; i++) { if (!present_section_nr(i)) continue; - err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, - BOOT); + err = add_memory_section(0, __nr_to_section(i), MEM_ONLINE, + BOOT); if (!ret) ret = err; } diff --git a/drivers/base/node.c b/drivers/base/node.c index 36b4305..b3b72d6 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -375,8 +375,10 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) return -EFAULT; if (!node_online(nid)) return 0; - sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); - sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; + + sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); + sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); + sect_end_pfn += PAGES_PER_SECTION - 1; for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { int page_nid; @@ -400,7 +402,8 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) } /* unregister memory section under all nodes that it spans */ -int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) +int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, + unsigned long phys_index) { NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); unsigned long pfn, sect_start_pfn, sect_end_pfn; @@ -412,7 +415,8 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) if (!unlinked_nodes) return -ENOMEM; nodes_clear(*unlinked_nodes); - sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); + + sect_start_pfn = section_nr_to_pfn(phys_index); sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { int nid; diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile index abe46ed..118c1b9 100644 --- a/drivers/base/power/Makefile +++ b/drivers/base/power/Makefile @@ -1,7 +1,6 @@ -obj-$(CONFIG_PM) += sysfs.o +obj-$(CONFIG_PM) += sysfs.o generic_ops.o obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o obj-$(CONFIG_PM_RUNTIME) += runtime.o -obj-$(CONFIG_PM_OPS) += generic_ops.o obj-$(CONFIG_PM_TRACE_RTC) += trace.o obj-$(CONFIG_PM_OPP) += opp.o diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 8340497..052dc53 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -423,26 +423,22 @@ static int device_resume_noirq(struct device *dev, pm_message_t state) TRACE_DEVICE(dev); TRACE_RESUME(0); - if (dev->bus && dev->bus->pm) { - pm_dev_dbg(dev, state, "EARLY "); - error = pm_noirq_op(dev, dev->bus->pm, state); - if (error) - goto End; + if (dev->pwr_domain) { + pm_dev_dbg(dev, state, "EARLY power domain "); + pm_noirq_op(dev, &dev->pwr_domain->ops, state); } if (dev->type && dev->type->pm) { pm_dev_dbg(dev, state, "EARLY type "); error = pm_noirq_op(dev, dev->type->pm, state); - if (error) - goto End; - } - - if (dev->class && dev->class->pm) { + } else if (dev->class && dev->class->pm) { pm_dev_dbg(dev, state, "EARLY class "); error = pm_noirq_op(dev, dev->class->pm, state); + } else if (dev->bus && dev->bus->pm) { + pm_dev_dbg(dev, state, "EARLY "); + error = pm_noirq_op(dev, dev->bus->pm, state); } -End: TRACE_RESUME(error); return error; } @@ -518,36 +514,39 @@ static int device_resume(struct device *dev, pm_message_t state, bool async) dev->power.in_suspend = false; - if (dev->bus) { - if (dev->bus->pm) { - pm_dev_dbg(dev, state, ""); - error = pm_op(dev, dev->bus->pm, state); - } else if (dev->bus->resume) { - pm_dev_dbg(dev, state, "legacy "); - error = legacy_resume(dev, dev->bus->resume); - } - if (error) - goto End; + if (dev->pwr_domain) { + pm_dev_dbg(dev, state, "power domain "); + pm_op(dev, &dev->pwr_domain->ops, state); } - if (dev->type) { - if (dev->type->pm) { - pm_dev_dbg(dev, state, "type "); - error = pm_op(dev, dev->type->pm, state); - } - if (error) - goto End; + if (dev->type && dev->type->pm) { + pm_dev_dbg(dev, state, "type "); + error = pm_op(dev, dev->type->pm, state); + goto End; } if (dev->class) { if (dev->class->pm) { pm_dev_dbg(dev, state, "class "); error = pm_op(dev, dev->class->pm, state); + goto End; } else if (dev->class->resume) { pm_dev_dbg(dev, state, "legacy class "); error = legacy_resume(dev, dev->class->resume); + goto End; } } + + if (dev->bus) { + if (dev->bus->pm) { + pm_dev_dbg(dev, state, ""); + error = pm_op(dev, dev->bus->pm, state); + } else if (dev->bus->resume) { + pm_dev_dbg(dev, state, "legacy "); + error = legacy_resume(dev, dev->bus->resume); + } + } + End: device_unlock(dev); complete_all(&dev->power.completion); @@ -629,19 +628,23 @@ static void device_complete(struct device *dev, pm_message_t state) { device_lock(dev); - if (dev->class && dev->class->pm && dev->class->pm->complete) { - pm_dev_dbg(dev, state, "completing class "); - dev->class->pm->complete(dev); + if (dev->pwr_domain && dev->pwr_domain->ops.complete) { + pm_dev_dbg(dev, state, "completing power domain "); + dev->pwr_domain->ops.complete(dev); } - if (dev->type && dev->type->pm && dev->type->pm->complete) { + if (dev->type && dev->type->pm) { pm_dev_dbg(dev, state, "completing type "); - dev->type->pm->complete(dev); - } - - if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { + if (dev->type->pm->complete) + dev->type->pm->complete(dev); + } else if (dev->class && dev->class->pm) { + pm_dev_dbg(dev, state, "completing class "); + if (dev->class->pm->complete) + dev->class->pm->complete(dev); + } else if (dev->bus && dev->bus->pm) { pm_dev_dbg(dev, state, "completing "); - dev->bus->pm->complete(dev); + if (dev->bus->pm->complete) + dev->bus->pm->complete(dev); } device_unlock(dev); @@ -669,7 +672,6 @@ static void dpm_complete(pm_message_t state) mutex_unlock(&dpm_list_mtx); device_complete(dev, state); - pm_runtime_put_sync(dev); mutex_lock(&dpm_list_mtx); put_device(dev); @@ -727,29 +729,31 @@ static pm_message_t resume_event(pm_message_t sleep_state) */ static int device_suspend_noirq(struct device *dev, pm_message_t state) { - int error = 0; - - if (dev->class && dev->class->pm) { - pm_dev_dbg(dev, state, "LATE class "); - error = pm_noirq_op(dev, dev->class->pm, state); - if (error) - goto End; - } + int error; if (dev->type && dev->type->pm) { pm_dev_dbg(dev, state, "LATE type "); error = pm_noirq_op(dev, dev->type->pm, state); if (error) - goto End; - } - - if (dev->bus && dev->bus->pm) { + return error; + } else if (dev->class && dev->class->pm) { + pm_dev_dbg(dev, state, "LATE class "); + error = pm_noirq_op(dev, dev->class->pm, state); + if (error) + return error; + } else if (dev->bus && dev->bus->pm) { pm_dev_dbg(dev, state, "LATE "); error = pm_noirq_op(dev, dev->bus->pm, state); + if (error) + return error; } -End: - return error; + if (dev->pwr_domain) { + pm_dev_dbg(dev, state, "LATE power domain "); + pm_noirq_op(dev, &dev->pwr_domain->ops, state); + } + + return 0; } /** @@ -836,25 +840,22 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async) goto End; } + if (dev->type && dev->type->pm) { + pm_dev_dbg(dev, state, "type "); + error = pm_op(dev, dev->type->pm, state); + goto Domain; + } + if (dev->class) { if (dev->class->pm) { pm_dev_dbg(dev, state, "class "); error = pm_op(dev, dev->class->pm, state); + goto Domain; } else if (dev->class->suspend) { pm_dev_dbg(dev, state, "legacy class "); error = legacy_suspend(dev, state, dev->class->suspend); + goto Domain; } - if (error) - goto End; - } - - if (dev->type) { - if (dev->type->pm) { - pm_dev_dbg(dev, state, "type "); - error = pm_op(dev, dev->type->pm, state); - } - if (error) - goto End; } if (dev->bus) { @@ -867,6 +868,12 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async) } } + Domain: + if (!error && dev->pwr_domain) { + pm_dev_dbg(dev, state, "power domain "); + pm_op(dev, &dev->pwr_domain->ops, state); + } + End: device_unlock(dev); complete_all(&dev->power.completion); @@ -957,27 +964,34 @@ static int device_prepare(struct device *dev, pm_message_t state) device_lock(dev); - if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { + if (dev->type && dev->type->pm) { + pm_dev_dbg(dev, state, "preparing type "); + if (dev->type->pm->prepare) + error = dev->type->pm->prepare(dev); + suspend_report_result(dev->type->pm->prepare, error); + if (error) + goto End; + } else if (dev->class && dev->class->pm) { + pm_dev_dbg(dev, state, "preparing class "); + if (dev->class->pm->prepare) + error = dev->class->pm->prepare(dev); + suspend_report_result(dev->class->pm->prepare, error); + if (error) + goto End; + } else if (dev->bus && dev->bus->pm) { pm_dev_dbg(dev, state, "preparing "); - error = dev->bus->pm->prepare(dev); + if (dev->bus->pm->prepare) + error = dev->bus->pm->prepare(dev); suspend_report_result(dev->bus->pm->prepare, error); if (error) goto End; } - if (dev->type && dev->type->pm && dev->type->pm->prepare) { - pm_dev_dbg(dev, state, "preparing type "); - error = dev->type->pm->prepare(dev); - suspend_report_result(dev->type->pm->prepare, error); - if (error) - goto End; + if (dev->pwr_domain && dev->pwr_domain->ops.prepare) { + pm_dev_dbg(dev, state, "preparing power domain "); + dev->pwr_domain->ops.prepare(dev); } - if (dev->class && dev->class->pm && dev->class->pm->prepare) { - pm_dev_dbg(dev, state, "preparing class "); - error = dev->class->pm->prepare(dev); - suspend_report_result(dev->class->pm->prepare, error); - } End: device_unlock(dev); @@ -1005,12 +1019,9 @@ static int dpm_prepare(pm_message_t state) if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) pm_wakeup_event(dev, 0); - if (pm_wakeup_pending()) { - pm_runtime_put_sync(dev); - error = -EBUSY; - } else { - error = device_prepare(dev, state); - } + pm_runtime_put_sync(dev); + error = pm_wakeup_pending() ? + -EBUSY : device_prepare(dev, state); mutex_lock(&dpm_list_mtx); if (error) { diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c index 2bb9b4c..56a6899 100644 --- a/drivers/base/power/opp.c +++ b/drivers/base/power/opp.c @@ -222,7 +222,7 @@ int opp_get_opp_count(struct device *dev) * opp_find_freq_exact() - search for an exact frequency * @dev: device for which we do this operation * @freq: frequency to search for - * @is_available: true/false - match for available opp + * @available: true/false - match for available opp * * Searches for exact match in the opp list and returns pointer to the matching * opp if found, else returns ERR_PTR in case of error and should be handled diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h index 698dde7..f2a25f1 100644 --- a/drivers/base/power/power.h +++ b/drivers/base/power/power.h @@ -58,19 +58,18 @@ static inline void device_pm_move_last(struct device *dev) {} * sysfs.c */ -extern int dpm_sysfs_add(struct device *); -extern void dpm_sysfs_remove(struct device *); -extern void rpm_sysfs_remove(struct device *); +extern int dpm_sysfs_add(struct device *dev); +extern void dpm_sysfs_remove(struct device *dev); +extern void rpm_sysfs_remove(struct device *dev); +extern int wakeup_sysfs_add(struct device *dev); +extern void wakeup_sysfs_remove(struct device *dev); #else /* CONFIG_PM */ -static inline int dpm_sysfs_add(struct device *dev) -{ - return 0; -} - -static inline void dpm_sysfs_remove(struct device *dev) -{ -} +static inline int dpm_sysfs_add(struct device *dev) { return 0; } +static inline void dpm_sysfs_remove(struct device *dev) {} +static inline void rpm_sysfs_remove(struct device *dev) {} +static inline int wakeup_sysfs_add(struct device *dev) { return 0; } +static inline void wakeup_sysfs_remove(struct device *dev) {} #endif diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 42615b4..54597c8 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -168,6 +168,7 @@ static int rpm_check_suspend_allowed(struct device *dev) static int rpm_idle(struct device *dev, int rpmflags) { int (*callback)(struct device *); + int (*domain_callback)(struct device *); int retval; retval = rpm_check_suspend_allowed(dev); @@ -213,19 +214,28 @@ static int rpm_idle(struct device *dev, int rpmflags) dev->power.idle_notification = true; - if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle) - callback = dev->bus->pm->runtime_idle; - else if (dev->type && dev->type->pm && dev->type->pm->runtime_idle) + if (dev->type && dev->type->pm) callback = dev->type->pm->runtime_idle; else if (dev->class && dev->class->pm) callback = dev->class->pm->runtime_idle; + else if (dev->bus && dev->bus->pm) + callback = dev->bus->pm->runtime_idle; else callback = NULL; - if (callback) { + if (dev->pwr_domain) + domain_callback = dev->pwr_domain->ops.runtime_idle; + else + domain_callback = NULL; + + if (callback || domain_callback) { spin_unlock_irq(&dev->power.lock); - callback(dev); + if (domain_callback) + retval = domain_callback(dev); + + if (!retval && callback) + callback(dev); spin_lock_irq(&dev->power.lock); } @@ -372,12 +382,12 @@ static int rpm_suspend(struct device *dev, int rpmflags) __update_runtime_status(dev, RPM_SUSPENDING); - if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) - callback = dev->bus->pm->runtime_suspend; - else if (dev->type && dev->type->pm && dev->type->pm->runtime_suspend) + if (dev->type && dev->type->pm) callback = dev->type->pm->runtime_suspend; else if (dev->class && dev->class->pm) callback = dev->class->pm->runtime_suspend; + else if (dev->bus && dev->bus->pm) + callback = dev->bus->pm->runtime_suspend; else callback = NULL; @@ -390,6 +400,8 @@ static int rpm_suspend(struct device *dev, int rpmflags) else pm_runtime_cancel_pending(dev); } else { + if (dev->pwr_domain) + rpm_callback(dev->pwr_domain->ops.runtime_suspend, dev); no_callback: __update_runtime_status(dev, RPM_SUSPENDED); pm_runtime_deactivate_timer(dev); @@ -569,12 +581,15 @@ static int rpm_resume(struct device *dev, int rpmflags) __update_runtime_status(dev, RPM_RESUMING); - if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume) - callback = dev->bus->pm->runtime_resume; - else if (dev->type && dev->type->pm && dev->type->pm->runtime_resume) + if (dev->pwr_domain) + rpm_callback(dev->pwr_domain->ops.runtime_resume, dev); + + if (dev->type && dev->type->pm) callback = dev->type->pm->runtime_resume; else if (dev->class && dev->class->pm) callback = dev->class->pm->runtime_resume; + else if (dev->bus && dev->bus->pm) + callback = dev->bus->pm->runtime_resume; else callback = NULL; diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c index 0b1e46b..fff49be 100644 --- a/drivers/base/power/sysfs.c +++ b/drivers/base/power/sysfs.c @@ -431,26 +431,18 @@ static ssize_t async_store(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(async, 0644, async_show, async_store); #endif /* CONFIG_PM_ADVANCED_DEBUG */ -static struct attribute * power_attrs[] = { - &dev_attr_wakeup.attr, -#ifdef CONFIG_PM_SLEEP - &dev_attr_wakeup_count.attr, - &dev_attr_wakeup_active_count.attr, - &dev_attr_wakeup_hit_count.attr, - &dev_attr_wakeup_active.attr, - &dev_attr_wakeup_total_time_ms.attr, - &dev_attr_wakeup_max_time_ms.attr, - &dev_attr_wakeup_last_time_ms.attr, -#endif +static struct attribute *power_attrs[] = { #ifdef CONFIG_PM_ADVANCED_DEBUG +#ifdef CONFIG_PM_SLEEP &dev_attr_async.attr, +#endif #ifdef CONFIG_PM_RUNTIME &dev_attr_runtime_status.attr, &dev_attr_runtime_usage.attr, &dev_attr_runtime_active_kids.attr, &dev_attr_runtime_enabled.attr, #endif -#endif +#endif /* CONFIG_PM_ADVANCED_DEBUG */ NULL, }; static struct attribute_group pm_attr_group = { @@ -458,9 +450,26 @@ static struct attribute_group pm_attr_group = { .attrs = power_attrs, }; -#ifdef CONFIG_PM_RUNTIME +static struct attribute *wakeup_attrs[] = { +#ifdef CONFIG_PM_SLEEP + &dev_attr_wakeup.attr, + &dev_attr_wakeup_count.attr, + &dev_attr_wakeup_active_count.attr, + &dev_attr_wakeup_hit_count.attr, + &dev_attr_wakeup_active.attr, + &dev_attr_wakeup_total_time_ms.attr, + &dev_attr_wakeup_max_time_ms.attr, + &dev_attr_wakeup_last_time_ms.attr, +#endif + NULL, +}; +static struct attribute_group pm_wakeup_attr_group = { + .name = power_group_name, + .attrs = wakeup_attrs, +}; static struct attribute *runtime_attrs[] = { +#ifdef CONFIG_PM_RUNTIME #ifndef CONFIG_PM_ADVANCED_DEBUG &dev_attr_runtime_status.attr, #endif @@ -468,6 +477,7 @@ static struct attribute *runtime_attrs[] = { &dev_attr_runtime_suspended_time.attr, &dev_attr_runtime_active_time.attr, &dev_attr_autosuspend_delay_ms.attr, +#endif /* CONFIG_PM_RUNTIME */ NULL, }; static struct attribute_group pm_runtime_attr_group = { @@ -480,35 +490,49 @@ int dpm_sysfs_add(struct device *dev) int rc; rc = sysfs_create_group(&dev->kobj, &pm_attr_group); - if (rc == 0 && !dev->power.no_callbacks) { + if (rc) + return rc; + + if (pm_runtime_callbacks_present(dev)) { rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group); if (rc) - sysfs_remove_group(&dev->kobj, &pm_attr_group); + goto err_out; + } + + if (device_can_wakeup(dev)) { + rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group); + if (rc) { + if (pm_runtime_callbacks_present(dev)) + sysfs_unmerge_group(&dev->kobj, + &pm_runtime_attr_group); + goto err_out; + } } + return 0; + + err_out: + sysfs_remove_group(&dev->kobj, &pm_attr_group); return rc; } -void rpm_sysfs_remove(struct device *dev) +int wakeup_sysfs_add(struct device *dev) { - sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group); + return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group); } -void dpm_sysfs_remove(struct device *dev) +void wakeup_sysfs_remove(struct device *dev) { - rpm_sysfs_remove(dev); - sysfs_remove_group(&dev->kobj, &pm_attr_group); + sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); } -#else /* CONFIG_PM_RUNTIME */ - -int dpm_sysfs_add(struct device * dev) +void rpm_sysfs_remove(struct device *dev) { - return sysfs_create_group(&dev->kobj, &pm_attr_group); + sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group); } -void dpm_sysfs_remove(struct device * dev) +void dpm_sysfs_remove(struct device *dev) { + rpm_sysfs_remove(dev); + sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); sysfs_remove_group(&dev->kobj, &pm_attr_group); } - -#endif diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c index 9f4258d..c80e138 100644 --- a/drivers/base/power/trace.c +++ b/drivers/base/power/trace.c @@ -112,7 +112,7 @@ static unsigned int read_magic_time(void) unsigned int val; get_rtc_time(&time); - printk("Time: %2d:%02d:%02d Date: %02d/%02d/%02d\n", + pr_info("Time: %2d:%02d:%02d Date: %02d/%02d/%02d\n", time.tm_hour, time.tm_min, time.tm_sec, time.tm_mon + 1, time.tm_mday, time.tm_year % 100); val = time.tm_year; /* 100 years */ @@ -179,7 +179,7 @@ static int show_file_hash(unsigned int value) unsigned int hash = hash_string(lineno, file, FILEHASH); if (hash != value) continue; - printk(" hash matches %s:%u\n", file, lineno); + pr_info(" hash matches %s:%u\n", file, lineno); match++; } return match; @@ -255,7 +255,7 @@ static int late_resume_init(void) val = val / FILEHASH; dev = val /* % DEVHASH */; - printk(" Magic number: %d:%d:%d\n", user, file, dev); + pr_info(" Magic number: %d:%d:%d\n", user, file, dev); show_file_hash(file); show_dev_hash(dev); return 0; diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 8ec406d..4573c83 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -24,12 +24,26 @@ */ bool events_check_enabled; -/* The counter of registered wakeup events. */ -static atomic_t event_count = ATOMIC_INIT(0); -/* A preserved old value of event_count. */ +/* + * Combined counters of registered wakeup events and wakeup events in progress. + * They need to be modified together atomically, so it's better to use one + * atomic variable to hold them both. + */ +static atomic_t combined_event_count = ATOMIC_INIT(0); + +#define IN_PROGRESS_BITS (sizeof(int) * 4) +#define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1) + +static void split_counters(unsigned int *cnt, unsigned int *inpr) +{ + unsigned int comb = atomic_read(&combined_event_count); + + *cnt = (comb >> IN_PROGRESS_BITS); + *inpr = comb & MAX_IN_PROGRESS; +} + +/* A preserved old value of the events counter. */ static unsigned int saved_count; -/* The counter of wakeup events being processed. */ -static atomic_t events_in_progress = ATOMIC_INIT(0); static DEFINE_SPINLOCK(events_lock); @@ -228,6 +242,35 @@ int device_wakeup_disable(struct device *dev) EXPORT_SYMBOL_GPL(device_wakeup_disable); /** + * device_set_wakeup_capable - Set/reset device wakeup capability flag. + * @dev: Device to handle. + * @capable: Whether or not @dev is capable of waking up the system from sleep. + * + * If @capable is set, set the @dev's power.can_wakeup flag and add its + * wakeup-related attributes to sysfs. Otherwise, unset the @dev's + * power.can_wakeup flag and remove its wakeup-related attributes from sysfs. + * + * This function may sleep and it can't be called from any context where + * sleeping is not allowed. + */ +void device_set_wakeup_capable(struct device *dev, bool capable) +{ + if (!!dev->power.can_wakeup == !!capable) + return; + + if (device_is_registered(dev)) { + if (capable) { + if (wakeup_sysfs_add(dev)) + return; + } else { + wakeup_sysfs_remove(dev); + } + } + dev->power.can_wakeup = capable; +} +EXPORT_SYMBOL_GPL(device_set_wakeup_capable); + +/** * device_init_wakeup - Device wakeup initialization. * @dev: Device to handle. * @enable: Whether or not to enable @dev as a wakeup device. @@ -307,7 +350,8 @@ static void wakeup_source_activate(struct wakeup_source *ws) ws->timer_expires = jiffies; ws->last_time = ktime_get(); - atomic_inc(&events_in_progress); + /* Increment the counter of events in progress. */ + atomic_inc(&combined_event_count); } /** @@ -394,14 +438,10 @@ static void wakeup_source_deactivate(struct wakeup_source *ws) del_timer(&ws->timer); /* - * event_count has to be incremented before events_in_progress is - * modified, so that the callers of pm_check_wakeup_events() and - * pm_save_wakeup_count() don't see the old value of event_count and - * events_in_progress equal to zero at the same time. + * Increment the counter of registered wakeup events and decrement the + * couter of wakeup events in progress simultaneously. */ - atomic_inc(&event_count); - smp_mb__before_atomic_dec(); - atomic_dec(&events_in_progress); + atomic_add(MAX_IN_PROGRESS, &combined_event_count); } /** @@ -556,8 +596,10 @@ bool pm_wakeup_pending(void) spin_lock_irqsave(&events_lock, flags); if (events_check_enabled) { - ret = ((unsigned int)atomic_read(&event_count) != saved_count) - || atomic_read(&events_in_progress); + unsigned int cnt, inpr; + + split_counters(&cnt, &inpr); + ret = (cnt != saved_count || inpr > 0); events_check_enabled = !ret; } spin_unlock_irqrestore(&events_lock, flags); @@ -573,25 +615,25 @@ bool pm_wakeup_pending(void) * Store the number of registered wakeup events at the address in @count. Block * if the current number of wakeup events being processed is nonzero. * - * Return false if the wait for the number of wakeup events being processed to + * Return 'false' if the wait for the number of wakeup events being processed to * drop down to zero has been interrupted by a signal (and the current number - * of wakeup events being processed is still nonzero). Otherwise return true. + * of wakeup events being processed is still nonzero). Otherwise return 'true'. */ bool pm_get_wakeup_count(unsigned int *count) { - bool ret; - - if (capable(CAP_SYS_ADMIN)) - events_check_enabled = false; + unsigned int cnt, inpr; - while (atomic_read(&events_in_progress) && !signal_pending(current)) { + for (;;) { + split_counters(&cnt, &inpr); + if (inpr == 0 || signal_pending(current)) + break; pm_wakeup_update_hit_counts(); schedule_timeout_interruptible(msecs_to_jiffies(TIMEOUT)); } - ret = !atomic_read(&events_in_progress); - *count = atomic_read(&event_count); - return ret; + split_counters(&cnt, &inpr); + *count = cnt; + return !inpr; } /** @@ -600,24 +642,25 @@ bool pm_get_wakeup_count(unsigned int *count) * * If @count is equal to the current number of registered wakeup events and the * current number of wakeup events being processed is zero, store @count as the - * old number of registered wakeup events to be used by pm_check_wakeup_events() - * and return true. Otherwise return false. + * old number of registered wakeup events for pm_check_wakeup_events(), enable + * wakeup events detection and return 'true'. Otherwise disable wakeup events + * detection and return 'false'. */ bool pm_save_wakeup_count(unsigned int count) { - bool ret = false; + unsigned int cnt, inpr; + events_check_enabled = false; spin_lock_irq(&events_lock); - if (count == (unsigned int)atomic_read(&event_count) - && !atomic_read(&events_in_progress)) { + split_counters(&cnt, &inpr); + if (cnt == count && inpr == 0) { saved_count = count; events_check_enabled = true; - ret = true; } spin_unlock_irq(&events_lock); - if (!ret) + if (!events_check_enabled) pm_wakeup_update_hit_counts(); - return ret; + return events_check_enabled; } static struct dentry *wakeup_sources_stats_dentry; diff --git a/drivers/base/sys.c b/drivers/base/sys.c index 1667aaf..f6fb547 100644 --- a/drivers/base/sys.c +++ b/drivers/base/sys.c @@ -166,6 +166,36 @@ EXPORT_SYMBOL_GPL(sysdev_class_unregister); static DEFINE_MUTEX(sysdev_drivers_lock); +/* + * @dev != NULL means that we're unwinding because some drv->add() + * failed for some reason. You need to grab sysdev_drivers_lock before + * calling this. + */ +static void __sysdev_driver_remove(struct sysdev_class *cls, + struct sysdev_driver *drv, + struct sys_device *from_dev) +{ + struct sys_device *dev = from_dev; + + list_del_init(&drv->entry); + if (!cls) + return; + + if (!drv->remove) + goto kset_put; + + if (dev) + list_for_each_entry_continue_reverse(dev, &cls->kset.list, + kobj.entry) + drv->remove(dev); + else + list_for_each_entry(dev, &cls->kset.list, kobj.entry) + drv->remove(dev); + +kset_put: + kset_put(&cls->kset); +} + /** * sysdev_driver_register - Register auxillary driver * @cls: Device class driver belongs to. @@ -175,14 +205,14 @@ static DEFINE_MUTEX(sysdev_drivers_lock); * called on each operation on devices of that class. The refcount * of @cls is incremented. */ - int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv) { + struct sys_device *dev = NULL; int err = 0; if (!cls) { - WARN(1, KERN_WARNING "sysdev: invalid class passed to " - "sysdev_driver_register!\n"); + WARN(1, KERN_WARNING "sysdev: invalid class passed to %s!\n", + __func__); return -EINVAL; } @@ -198,19 +228,27 @@ int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv) /* If devices of this class already exist, tell the driver */ if (drv->add) { - struct sys_device *dev; - list_for_each_entry(dev, &cls->kset.list, kobj.entry) - drv->add(dev); + list_for_each_entry(dev, &cls->kset.list, kobj.entry) { + err = drv->add(dev); + if (err) + goto unwind; + } } } else { err = -EINVAL; WARN(1, KERN_ERR "%s: invalid device class\n", __func__); } + + goto unlock; + +unwind: + __sysdev_driver_remove(cls, drv, dev); + +unlock: mutex_unlock(&sysdev_drivers_lock); return err; } - /** * sysdev_driver_unregister - Remove an auxillary driver. * @cls: Class driver belongs to. @@ -220,23 +258,12 @@ void sysdev_driver_unregister(struct sysdev_class *cls, struct sysdev_driver *drv) { mutex_lock(&sysdev_drivers_lock); - list_del_init(&drv->entry); - if (cls) { - if (drv->remove) { - struct sys_device *dev; - list_for_each_entry(dev, &cls->kset.list, kobj.entry) - drv->remove(dev); - } - kset_put(&cls->kset); - } + __sysdev_driver_remove(cls, drv, NULL); mutex_unlock(&sysdev_drivers_lock); } - EXPORT_SYMBOL_GPL(sysdev_driver_register); EXPORT_SYMBOL_GPL(sysdev_driver_unregister); - - /** * sysdev_register - add a system device to the tree * @sysdev: device in question diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c new file mode 100644 index 0000000..90af294 --- /dev/null +++ b/drivers/base/syscore.c @@ -0,0 +1,117 @@ +/* + * syscore.c - Execution of system core operations. + * + * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. + * + * This file is released under the GPLv2. + */ + +#include <linux/syscore_ops.h> +#include <linux/mutex.h> +#include <linux/module.h> + +static LIST_HEAD(syscore_ops_list); +static DEFINE_MUTEX(syscore_ops_lock); + +/** + * register_syscore_ops - Register a set of system core operations. + * @ops: System core operations to register. + */ +void register_syscore_ops(struct syscore_ops *ops) +{ + mutex_lock(&syscore_ops_lock); + list_add_tail(&ops->node, &syscore_ops_list); + mutex_unlock(&syscore_ops_lock); +} +EXPORT_SYMBOL_GPL(register_syscore_ops); + +/** + * unregister_syscore_ops - Unregister a set of system core operations. + * @ops: System core operations to unregister. + */ +void unregister_syscore_ops(struct syscore_ops *ops) +{ + mutex_lock(&syscore_ops_lock); + list_del(&ops->node); + mutex_unlock(&syscore_ops_lock); +} +EXPORT_SYMBOL_GPL(unregister_syscore_ops); + +#ifdef CONFIG_PM_SLEEP +/** + * syscore_suspend - Execute all the registered system core suspend callbacks. + * + * This function is executed with one CPU on-line and disabled interrupts. + */ +int syscore_suspend(void) +{ + struct syscore_ops *ops; + int ret = 0; + + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled before system core suspend.\n"); + + list_for_each_entry_reverse(ops, &syscore_ops_list, node) + if (ops->suspend) { + if (initcall_debug) + pr_info("PM: Calling %pF\n", ops->suspend); + ret = ops->suspend(); + if (ret) + goto err_out; + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled after %pF\n", ops->suspend); + } + + return 0; + + err_out: + pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend); + + list_for_each_entry_continue(ops, &syscore_ops_list, node) + if (ops->resume) + ops->resume(); + + return ret; +} + +/** + * syscore_resume - Execute all the registered system core resume callbacks. + * + * This function is executed with one CPU on-line and disabled interrupts. + */ +void syscore_resume(void) +{ + struct syscore_ops *ops; + + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled before system core resume.\n"); + + list_for_each_entry(ops, &syscore_ops_list, node) + if (ops->resume) { + if (initcall_debug) + pr_info("PM: Calling %pF\n", ops->resume); + ops->resume(); + WARN_ONCE(!irqs_disabled(), + "Interrupts enabled after %pF\n", ops->resume); + } +} +#endif /* CONFIG_PM_SLEEP */ + +/** + * syscore_shutdown - Execute all the registered system core shutdown callbacks. + */ +void syscore_shutdown(void) +{ + struct syscore_ops *ops; + + mutex_lock(&syscore_ops_lock); + + list_for_each_entry_reverse(ops, &syscore_ops_list, node) + if (ops->shutdown) { + if (initcall_debug) + pr_info("PM: Calling %pF\n", ops->shutdown); + ops->shutdown(); + } + + mutex_unlock(&syscore_ops_lock); +} |