[RFC Patch v1 02/13] ACPI, extlog: replace open-coded _DSM specific code with helper functions

From: Jiang Liu
Date: Wed Dec 18 2013 - 01:57:38 EST


Use helper functions to simplify _DSM related code in acpi_extlog driver.
Also mark initialization data and functions with __init and __initdata
to reduce memory footprint.

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
drivers/acpi/acpi_extlog.c | 61 +++++++++-----------------------------------
1 file changed, 12 insertions(+), 49 deletions(-)

diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index a6869e1..928c4db 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -20,11 +20,9 @@
#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */

#define EXTLOG_DSM_REV 0x0
-#define EXTLOG_FN_QUERY 0x0
#define EXTLOG_FN_ADDR 0x1

#define FLAG_OS_OPTIN BIT(0)
-#define EXTLOG_QUERY_L1_EXIST BIT(1)
#define ELOG_ENTRY_VALID (1ULL<<63)
#define ELOG_ENTRY_LEN 0x1000

@@ -43,7 +41,7 @@ struct extlog_l1_head {
u8 rev1[12];
};

-static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
+static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295";

/* L1 table related physical address */
static u64 elog_base;
@@ -153,62 +151,27 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
return NOTIFY_DONE;
}

-static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
+static bool __init extlog_get_l1addr(void)
{
- struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
- struct acpi_object_list input;
- union acpi_object params[4], *obj;
u8 uuid[16];
- int i;
+ acpi_handle handle;
+ union acpi_object *obj;

acpi_str_to_uuid(extlog_dsm_uuid, uuid);
- input.count = 4;
- input.pointer = params;
- params[0].type = ACPI_TYPE_BUFFER;
- params[0].buffer.length = 16;
- params[0].buffer.pointer = uuid;
- params[1].type = ACPI_TYPE_INTEGER;
- params[1].integer.value = rev;
- params[2].type = ACPI_TYPE_INTEGER;
- params[2].integer.value = func;
- params[3].type = ACPI_TYPE_PACKAGE;
- params[3].package.count = 0;
- params[3].package.elements = NULL;
-
- if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
- return -1;
-
- *ret = 0;
- obj = (union acpi_object *)buf.pointer;
- if (obj->type == ACPI_TYPE_INTEGER) {
- *ret = obj->integer.value;
- } else if (obj->type == ACPI_TYPE_BUFFER) {
- if (obj->buffer.length <= 8) {
- for (i = 0; i < obj->buffer.length; i++)
- *ret |= (obj->buffer.pointer[i] << (i * 8));
- }
- }
- kfree(buf.pointer);
-
- return 0;
-}
-
-static bool extlog_get_l1addr(void)
-{
- acpi_handle handle;
- u64 ret;

if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
return false;
-
- if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) ||
- !(ret & EXTLOG_QUERY_L1_EXIST))
+ if (!acpi_check_dsm(handle, uuid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR))
return false;
-
- if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
+ obj = acpi_evaluate_dsm_typed(handle, uuid, EXTLOG_DSM_REV,
+ EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER);
+ if (!obj) {
return false;
+ } else {
+ l1_dirbase = obj->integer.value;
+ ACPI_FREE(obj);
+ }

- l1_dirbase = ret;
/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
if (l1_dirbase & ((1 << 12) - 1)) {
pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
--
1.7.10.4

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