diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/osl.c | 280 |
1 files changed, 232 insertions, 48 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index d3bed219c442..0c2e445410ab 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -95,6 +95,21 @@ struct acpi_res_list { static LIST_HEAD(resource_list_head); static DEFINE_SPINLOCK(acpi_res_lock); +/* + * This list of permanent mappings is for memory that may be accessed from + * interrupt context, where we can't do the ioremap(). + */ +struct acpi_ioremap { + struct list_head list; + void __iomem *virt; + acpi_physical_address phys; + acpi_size size; + struct kref ref; +}; + +static LIST_HEAD(acpi_ioremaps); +static DEFINE_SPINLOCK(acpi_ioremap_lock); + #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ static char osi_setup_string[OSI_STRING_LENGTH_MAX]; @@ -201,38 +216,6 @@ static int __init acpi_reserve_resources(void) } device_initcall(acpi_reserve_resources); -acpi_status __init acpi_os_initialize(void) -{ - return AE_OK; -} - -acpi_status acpi_os_initialize1(void) -{ - kacpid_wq = create_workqueue("kacpid"); - kacpi_notify_wq = create_workqueue("kacpi_notify"); - kacpi_hotplug_wq = create_workqueue("kacpi_hotplug"); - BUG_ON(!kacpid_wq); - BUG_ON(!kacpi_notify_wq); - BUG_ON(!kacpi_hotplug_wq); - acpi_install_interface_handler(acpi_osi_handler); - acpi_osi_setup_late(); - return AE_OK; -} - -acpi_status acpi_os_terminate(void) -{ - if (acpi_irq_handler) { - acpi_os_remove_interrupt_handler(acpi_irq_irq, - acpi_irq_handler); - } - - destroy_workqueue(kacpid_wq); - destroy_workqueue(kacpi_notify_wq); - destroy_workqueue(kacpi_hotplug_wq); - - return AE_OK; -} - void acpi_os_printf(const char *fmt, ...) { va_list args; @@ -278,29 +261,135 @@ acpi_physical_address __init acpi_os_get_root_pointer(void) } } +/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ +static struct acpi_ioremap * +acpi_map_lookup(acpi_physical_address phys, acpi_size size) +{ + struct acpi_ioremap *map; + + list_for_each_entry_rcu(map, &acpi_ioremaps, list) + if (map->phys <= phys && + phys + size <= map->phys + map->size) + return map; + + return NULL; +} + +/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ +static void __iomem * +acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) +{ + struct acpi_ioremap *map; + + map = acpi_map_lookup(phys, size); + if (map) + return map->virt + (phys - map->phys); + + return NULL; +} + +/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ +static struct acpi_ioremap * +acpi_map_lookup_virt(void __iomem *virt, acpi_size size) +{ + struct acpi_ioremap *map; + + list_for_each_entry_rcu(map, &acpi_ioremaps, list) + if (map->virt <= virt && + virt + size <= map->virt + map->size) + return map; + + return NULL; +} + void __iomem *__init_refok acpi_os_map_memory(acpi_physical_address phys, acpi_size size) { + struct acpi_ioremap *map, *tmp_map; + unsigned long flags, pg_sz; + void __iomem *virt; + phys_addr_t pg_off; + if (phys > ULONG_MAX) { printk(KERN_ERR PREFIX "Cannot map memory that high\n"); return NULL; } - if (acpi_gbl_permanent_mmap) - /* - * ioremap checks to ensure this is in reserved space - */ - return ioremap((unsigned long)phys, size); - else + + if (!acpi_gbl_permanent_mmap) return __acpi_map_table((unsigned long)phys, size); + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return NULL; + + pg_off = round_down(phys, PAGE_SIZE); + pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; + virt = ioremap(pg_off, pg_sz); + if (!virt) { + kfree(map); + return NULL; + } + + INIT_LIST_HEAD(&map->list); + map->virt = virt; + map->phys = pg_off; + map->size = pg_sz; + kref_init(&map->ref); + + spin_lock_irqsave(&acpi_ioremap_lock, flags); + /* Check if page has already been mapped. */ + tmp_map = acpi_map_lookup(phys, size); + if (tmp_map) { + kref_get(&tmp_map->ref); + spin_unlock_irqrestore(&acpi_ioremap_lock, flags); + iounmap(map->virt); + kfree(map); + return tmp_map->virt + (phys - tmp_map->phys); + } + list_add_tail_rcu(&map->list, &acpi_ioremaps); + spin_unlock_irqrestore(&acpi_ioremap_lock, flags); + + return map->virt + (phys - map->phys); } EXPORT_SYMBOL_GPL(acpi_os_map_memory); +static void acpi_kref_del_iomap(struct kref *ref) +{ + struct acpi_ioremap *map; + + map = container_of(ref, struct acpi_ioremap, ref); + list_del_rcu(&map->list); +} + void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) { - if (acpi_gbl_permanent_mmap) - iounmap(virt); - else + struct acpi_ioremap *map; + unsigned long flags; + int del; + + if (!acpi_gbl_permanent_mmap) { __acpi_unmap_table(virt, size); + return; + } + + spin_lock_irqsave(&acpi_ioremap_lock, flags); + map = acpi_map_lookup_virt(virt, size); + if (!map) { + spin_unlock_irqrestore(&acpi_ioremap_lock, flags); + printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt); + dump_stack(); + return; + } + + del = kref_put(&map->ref, acpi_kref_del_iomap); + spin_unlock_irqrestore(&acpi_ioremap_lock, flags); + + if (!del) + return; + + synchronize_rcu(); + iounmap(map->virt); + kfree(map); } EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); @@ -310,6 +399,44 @@ void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) __acpi_unmap_table(virt, size); } +int acpi_os_map_generic_address(struct acpi_generic_address *addr) +{ + void __iomem *virt; + + if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) + return 0; + + if (!addr->address || !addr->bit_width) + return -EINVAL; + + virt = acpi_os_map_memory(addr->address, addr->bit_width / 8); + if (!virt) + return -EIO; + + return 0; +} +EXPORT_SYMBOL_GPL(acpi_os_map_generic_address); + +void acpi_os_unmap_generic_address(struct acpi_generic_address *addr) +{ + void __iomem *virt; + unsigned long flags; + acpi_size size = addr->bit_width / 8; + + if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) + return; + + if (!addr->address || !addr->bit_width) + return; + + spin_lock_irqsave(&acpi_ioremap_lock, flags); + virt = acpi_map_vaddr_lookup(addr->address, size); + spin_unlock_irqrestore(&acpi_ioremap_lock, flags); + + acpi_os_unmap_memory(virt, size); +} +EXPORT_SYMBOL_GPL(acpi_os_unmap_generic_address); + #ifdef ACPI_FUTURE_USAGE acpi_status acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) @@ -513,8 +640,15 @@ acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) { u32 dummy; void __iomem *virt_addr; - - virt_addr = ioremap(phys_addr, width); + int size = width / 8, unmap = 0; + + rcu_read_lock(); + virt_addr = acpi_map_vaddr_lookup(phys_addr, size); + rcu_read_unlock(); + if (!virt_addr) { + virt_addr = ioremap(phys_addr, size); + unmap = 1; + } if (!value) value = &dummy; @@ -532,7 +666,8 @@ acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) BUG(); } - iounmap(virt_addr); + if (unmap) + iounmap(virt_addr); return AE_OK; } @@ -541,8 +676,15 @@ acpi_status acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) { void __iomem *virt_addr; - - virt_addr = ioremap(phys_addr, width); + int size = width / 8, unmap = 0; + + rcu_read_lock(); + virt_addr = acpi_map_vaddr_lookup(phys_addr, size); + rcu_read_unlock(); + if (!virt_addr) { + virt_addr = ioremap(phys_addr, size); + unmap = 1; + } switch (width) { case 8: @@ -558,7 +700,8 @@ acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) BUG(); } - iounmap(virt_addr); + if (unmap) + iounmap(virt_addr); return AE_OK; } @@ -1400,5 +1543,46 @@ acpi_os_validate_address ( } return AE_OK; } - #endif + +acpi_status __init acpi_os_initialize(void) +{ + acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); + acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); + acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); + acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); + + return AE_OK; +} + +acpi_status acpi_os_initialize1(void) +{ + kacpid_wq = create_workqueue("kacpid"); + kacpi_notify_wq = create_workqueue("kacpi_notify"); + kacpi_hotplug_wq = create_workqueue("kacpi_hotplug"); + BUG_ON(!kacpid_wq); + BUG_ON(!kacpi_notify_wq); + BUG_ON(!kacpi_hotplug_wq); + acpi_install_interface_handler(acpi_osi_handler); + acpi_osi_setup_late(); + return AE_OK; +} + +acpi_status acpi_os_terminate(void) +{ + if (acpi_irq_handler) { + acpi_os_remove_interrupt_handler(acpi_irq_irq, + acpi_irq_handler); + } + + acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); + acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); + acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); + acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); + + destroy_workqueue(kacpid_wq); + destroy_workqueue(kacpi_notify_wq); + destroy_workqueue(kacpi_hotplug_wq); + + return AE_OK; +} |