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Subject[RFC PATCH 09/14] ACPI: Add acpi_run_dsm()
Date
Will need to use that get dmar entries for hotplug

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/acpi/bus.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/acpi.h | 10 ++++++
2 files changed, 87 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index e0960c7..9025dbb 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -520,6 +520,83 @@ out_kfree:
}
EXPORT_SYMBOL(acpi_run_osc);

+static void acpi_print_dsm_error(acpi_handle handle,
+ struct acpi_dsm_context *context, char *error)
+{
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
+
+ if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
+ printk(KERN_DEBUG "%s for idx %x\n", error, context->func_idx);
+ else {
+ printk(KERN_DEBUG "%s:%s for idx %x\n",
+ (char *)buffer.pointer, error, context->func_idx);
+ kfree(buffer.pointer);
+ }
+}
+
+acpi_status acpi_run_dsm(acpi_handle handle, struct acpi_dsm_context *context)
+{
+ acpi_status status;
+ struct acpi_object_list input;
+ union acpi_object in_params[4];
+ union acpi_object *out_obj;
+ u8 uuid[16];
+ struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
+
+ if (!context)
+ return AE_ERROR;
+ if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
+ return AE_ERROR;
+ context->ret.length = ACPI_ALLOCATE_BUFFER;
+ context->ret.pointer = NULL;
+
+ /* Setting up input parameters */
+ input.count = 4;
+ input.pointer = in_params;
+ in_params[0].type = ACPI_TYPE_BUFFER;
+ in_params[0].buffer.length = 16;
+ in_params[0].buffer.pointer = uuid;
+ in_params[1].type = ACPI_TYPE_INTEGER;
+ in_params[1].integer.value = context->rev;
+ in_params[2].type = ACPI_TYPE_INTEGER;
+ in_params[2].integer.value = context->func_idx;
+ in_params[3].type = ACPI_TYPE_PACKAGE;
+ in_params[3].package.count = context->func_argc;
+ in_params[3].package.elements = context->func_argv;
+
+ status = acpi_evaluate_object(handle, "_DSM", &input, &output);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ if (!output.length)
+ return AE_NULL_OBJECT;
+
+ out_obj = output.pointer;
+ if (out_obj->type != ACPI_TYPE_BUFFER) {
+ acpi_print_dsm_error(handle, context,
+ "_DSM evaluation returned wrong type");
+ status = AE_TYPE;
+ goto out_kfree;
+ }
+
+ context->ret.length = out_obj->buffer.length;
+ context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
+ if (!context->ret.pointer) {
+ status = AE_NO_MEMORY;
+ goto out_kfree;
+ }
+ memcpy(context->ret.pointer, out_obj->buffer.pointer,
+ context->ret.length);
+ status = AE_OK;
+
+out_kfree:
+ kfree(output.pointer);
+ if (status != AE_OK)
+ context->ret.pointer = NULL;
+ return status;
+}
+EXPORT_SYMBOL(acpi_run_dsm);
+
bool osc_sb_apei_support_acked;
static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_support(void)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index d78baa7..14ad7d7 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -273,6 +273,16 @@ struct acpi_osc_context {

acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);

+struct acpi_dsm_context {
+ char *uuid_str; /* uuid string */
+ int rev;
+ int func_idx; /* function index */
+ int func_argc;
+ union acpi_object *func_argv;
+ struct acpi_buffer ret; /* free by caller if success */
+};
+acpi_status acpi_run_dsm(acpi_handle handle, struct acpi_dsm_context *context);
+
/* platform-wide _OSC bits */
#define OSC_SB_PAD_SUPPORT 1
#define OSC_SB_PPC_OST_SUPPORT 2
--
1.7.7


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