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authorLv Zheng <lv.zheng@intel.com>2014-05-20 11:39:41 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-05-27 20:13:08 +0400
commita238317ce8185519ed083e81e84260907fbbcf7f (patch)
treef5b228ac40941946db2e7427b1085a90c78c85b5 /drivers/acpi/apei
parent92985ef1db428cc6129a1d375a68c277aa05820b (diff)
downloadlinux-a238317ce8185519ed083e81e84260907fbbcf7f.tar.xz
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 'drivers/acpi/apei')
-rw-r--r--drivers/acpi/apei/einj.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 1be6f5564485..a095d4f858da 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -202,7 +202,7 @@ static void check_vendor_extension(u64 paddr,
if (!offset)
return;
- v = acpi_os_map_memory(paddr + offset, sizeof(*v));
+ v = acpi_os_map_iomem(paddr + offset, sizeof(*v));
if (!v)
return;
sbdf = v->pcie_sbdf;
@@ -210,7 +210,7 @@ static void check_vendor_extension(u64 paddr,
sbdf >> 24, (sbdf >> 16) & 0xff,
(sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
v->vendor_id, v->device_id, v->rev_id);
- acpi_os_unmap_memory(v, sizeof(*v));
+ acpi_os_unmap_iomem(v, sizeof(*v));
}
static void *einj_get_parameter_address(void)
@@ -236,7 +236,7 @@ static void *einj_get_parameter_address(void)
if (pa_v5) {
struct set_error_type_with_address *v5param;
- v5param = acpi_os_map_memory(pa_v5, sizeof(*v5param));
+ v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param));
if (v5param) {
acpi5 = 1;
check_vendor_extension(pa_v5, v5param);
@@ -246,11 +246,11 @@ static void *einj_get_parameter_address(void)
if (param_extension && pa_v4) {
struct einj_parameter *v4param;
- v4param = acpi_os_map_memory(pa_v4, sizeof(*v4param));
+ v4param = acpi_os_map_iomem(pa_v4, sizeof(*v4param));
if (!v4param)
return NULL;
if (v4param->reserved1 || v4param->reserved2) {
- acpi_os_unmap_memory(v4param, sizeof(*v4param));
+ acpi_os_unmap_iomem(v4param, sizeof(*v4param));
return NULL;
}
return v4param;
@@ -794,7 +794,7 @@ err_unmap:
sizeof(struct set_error_type_with_address) :
sizeof(struct einj_parameter);
- acpi_os_unmap_memory(einj_param, size);
+ acpi_os_unmap_iomem(einj_param, size);
}
apei_exec_post_unmap_gars(&ctx);
err_release:
@@ -816,7 +816,7 @@ static void __exit einj_exit(void)
sizeof(struct set_error_type_with_address) :
sizeof(struct einj_parameter);
- acpi_os_unmap_memory(einj_param, size);
+ acpi_os_unmap_iomem(einj_param, size);
}
einj_exec_ctx_init(&ctx);
apei_exec_post_unmap_gars(&ctx);