From 2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 19 Jan 2011 22:27:14 +0100 Subject: [PATCH] ACPI: Introduce acpi_os_ioremap() Commit ca9b600be38c ("ACPI / PM: Make suspend_nvs_save() use acpi_os_map_memory()") attempted to prevent the code in osl.c and nvs.c from using different ioremap() variants by making the latter use acpi_os_map_memory() for mapping the NVS pages. However, that also requires acpi_os_unmap_memory() to be used for unmapping them, which causes synchronize_rcu() to be executed many times in a row unnecessarily and introduces substantial delays during resume on some systems. Instead of using acpi_os_map_memory() for mapping the NVS pages in nvs.c introduce acpi_os_ioremap() calling ioremap_cache() and make the code in both osl.c and nvs.c use it. Reported-by: Jeff Chua Signed-off-by: Rafael J. Wysocki Signed-off-by: Linus Torvalds --- drivers/acpi/nvs.c | 7 ++++--- drivers/acpi/osl.c | 12 +++++++----- include/linux/acpi.h | 3 --- include/linux/acpi_io.h | 16 ++++++++++++++++ 4 files changed, 27 insertions(+), 11 deletions(-) create mode 100644 include/linux/acpi_io.h diff --git a/drivers/acpi/nvs.c b/drivers/acpi/nvs.c index 54b6ab8040a6..fa5a1df42b79 100644 --- a/drivers/acpi/nvs.c +++ b/drivers/acpi/nvs.c @@ -12,6 +12,7 @@ #include #include #include +#include #include /* @@ -80,7 +81,7 @@ void suspend_nvs_free(void) free_page((unsigned long)entry->data); entry->data = NULL; if (entry->kaddr) { - acpi_os_unmap_memory(entry->kaddr, entry->size); + iounmap(entry->kaddr); entry->kaddr = NULL; } } @@ -114,8 +115,8 @@ int suspend_nvs_save(void) list_for_each_entry(entry, &nvs_list, node) if (entry->data) { - entry->kaddr = acpi_os_map_memory(entry->phys_start, - entry->size); + entry->kaddr = acpi_os_ioremap(entry->phys_start, + entry->size); if (!entry->kaddr) { suspend_nvs_free(); return -ENOMEM; diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index e2dd6de5d50c..b0931818cf98 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -302,9 +303,10 @@ 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; + unsigned long flags; void __iomem *virt; - phys_addr_t pg_off; + acpi_physical_address pg_off; + acpi_size pg_sz; if (phys > ULONG_MAX) { printk(KERN_ERR PREFIX "Cannot map memory that high\n"); @@ -320,7 +322,7 @@ acpi_os_map_memory(acpi_physical_address phys, acpi_size size) pg_off = round_down(phys, PAGE_SIZE); pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; - virt = ioremap_cache(pg_off, pg_sz); + virt = acpi_os_ioremap(pg_off, pg_sz); if (!virt) { kfree(map); return NULL; @@ -642,7 +644,7 @@ acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) virt_addr = acpi_map_vaddr_lookup(phys_addr, size); rcu_read_unlock(); if (!virt_addr) { - virt_addr = ioremap_cache(phys_addr, size); + virt_addr = acpi_os_ioremap(phys_addr, size); unmap = 1; } if (!value) @@ -678,7 +680,7 @@ acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) virt_addr = acpi_map_vaddr_lookup(phys_addr, size); rcu_read_unlock(); if (!virt_addr) { - virt_addr = ioremap_cache(phys_addr, size); + virt_addr = acpi_os_ioremap(phys_addr, size); unmap = 1; } diff --git a/include/linux/acpi.h b/include/linux/acpi.h index eb176bb1b15b..a2e910e01293 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -306,9 +306,6 @@ extern acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req); extern void acpi_early_init(void); -int acpi_os_map_generic_address(struct acpi_generic_address *addr); -void acpi_os_unmap_generic_address(struct acpi_generic_address *addr); - #else /* !CONFIG_ACPI */ #define acpi_disabled 1 diff --git a/include/linux/acpi_io.h b/include/linux/acpi_io.h new file mode 100644 index 000000000000..7180013a4a3a --- /dev/null +++ b/include/linux/acpi_io.h @@ -0,0 +1,16 @@ +#ifndef _ACPI_IO_H_ +#define _ACPI_IO_H_ + +#include +#include + +static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, + acpi_size size) +{ + return ioremap_cache(phys, size); +} + +int acpi_os_map_generic_address(struct acpi_generic_address *addr); +void acpi_os_unmap_generic_address(struct acpi_generic_address *addr); + +#endif -- 2.34.1