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authorLv Zheng <lv.zheng@intel.com>2014-05-20 15:39:41 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-05-27 18:13:08 +0200
commita238317ce8185519ed083e81e84260907fbbcf7f (patch)
treef5b228ac40941946db2e7427b1085a90c78c85b5 /include/acpi
parent92985ef1db428cc6129a1d375a68c277aa05820b (diff)
downloadop-kernel-dev-a238317ce8185519ed083e81e84260907fbbcf7f.zip
op-kernel-dev-a238317ce8185519ed083e81e84260907fbbcf7f.tar.gz
ACPI: Clean up acpi_os_map/unmap_memory() to eliminate __iomem.
ACPICA doesn't include protections around address space checking, Linux build tests always complain increased sparse warnings around ACPICA internal acpi_os_map/unmap_memory() invocations. This patch tries to fix this issue permanently. There are 2 choices left for us to solve this issue: 1. Add __iomem address space awareness into ACPICA. 2. Remove sparse checker of __iomem from ACPICA source code. This patch chooses solution 2, because: 1. Most of the acpi_os_map/unmap_memory() invocations are used for ACPICA. table mappings, which in fact are not IO addresses. 2. The only IO addresses usage is for "system memory space" mapping code in: drivers/acpi/acpica/exregion.c drivers/acpi/acpica/evrgnini.c drivers/acpi/acpica/exregion.c The mapped address is accessed in the handler of "system memory space" - acpi_ex_system_memory_space_handler(). This function in fact can be changed to invoke acpi_os_read/write_memory() so that __iomem can always be type-casted in the OSL layer. According to the above investigation, we drew the following conclusion: It is not a good idea to introduce __iomem address space awareness into ACPICA mostly in order to protect non-IO addresses. We can simply remove __iomem for acpi_os_map/unmap_memory() to remove __iomem checker for ACPICA code. Then we need to enforce external usages to invoke other APIs that are aware of __iomem address space. The external usages are: drivers/acpi/apei/einj.c drivers/acpi/acpi_extlog.c drivers/char/tpm/tpm_acpi.c drivers/acpi/nvs.c This patch thus performs cleanups in this way: 1. Add acpi_os_map/unmap_iomem() to be invoked by non-ACPICA code. 2. Remove __iomem from acpi_os_map/unmap_memory(). Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/acpi_io.h3
-rw-r--r--include/acpi/platform/aclinux.h6
-rw-r--r--include/acpi/platform/aclinuxex.h4
3 files changed, 3 insertions, 10 deletions
diff --git a/include/acpi/acpi_io.h b/include/acpi/acpi_io.h
index 2be8580..444671e 100644
--- a/include/acpi/acpi_io.h
+++ b/include/acpi/acpi_io.h
@@ -9,6 +9,9 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
return ioremap_cache(phys, size);
}
+void __iomem *__init_refok
+acpi_os_map_iomem(acpi_physical_address phys, acpi_size size);
+void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size);
void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size);
int acpi_os_map_generic_address(struct acpi_generic_address *addr);
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index e700129..cd1f052 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -128,8 +128,6 @@
#define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_acquire_object
#define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_thread_id
#define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_lock
-#define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_map_memory
-#define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_unmap_memory
/*
* OSL interfaces used by debugger/disassembler
@@ -163,10 +161,6 @@
#define __init
#endif
-#ifndef __iomem
-#define __iomem
-#endif
-
/* Host-dependent types and defines for user-space ACPICA */
#define ACPI_FLUSH_CPU_CACHE()
diff --git a/include/acpi/platform/aclinuxex.h b/include/acpi/platform/aclinuxex.h
index cce0723..191e741 100644
--- a/include/acpi/platform/aclinuxex.h
+++ b/include/acpi/platform/aclinuxex.h
@@ -102,10 +102,6 @@ static inline acpi_thread_id acpi_os_get_thread_id(void)
lock ? AE_OK : AE_NO_MEMORY; \
})
-void __iomem *acpi_os_map_memory(acpi_physical_address where, acpi_size length);
-
-void acpi_os_unmap_memory(void __iomem * logical_address, acpi_size size);
-
/*
* OSL interfaces added by Linux
*/
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