summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpi_configfs.c
diff options
context:
space:
mode:
authorJan Kiszka <jan.kiszka@siemens.com>2017-06-09 20:36:31 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-06-22 02:43:12 +0200
commit772bf1e2878ecfca0d1f332071c83e021dd9cf01 (patch)
tree432cea90575ff9277a72960e7eea4bc988e6c138 /drivers/acpi/acpi_configfs.c
parent41f1830f5a7af77cf5c86359aba3cbd706687e52 (diff)
ACPI: configfs: Unload SSDT on configfs entry removal
Call directly into acpica to load a table to obtain its index on return. We choose the direct call of acpica internal functions to avoid having to modify its API which is used outside of Linux as well. Use that index to unload the table again when the corresponding directory in configfs gets removed. This allows to change SSDTs without rebooting the system. It also allows to destroy devices again that a dynamically loaded SSDT created. This is widely similar to the DT overlay behavior. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpi_configfs.c')
-rw-r--r--drivers/acpi/acpi_configfs.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c
index 146a77fb762d..853bc7fc673f 100644
--- a/drivers/acpi/acpi_configfs.c
+++ b/drivers/acpi/acpi_configfs.c
@@ -15,11 +15,15 @@
#include <linux/configfs.h>
#include <linux/acpi.h>
+#include "acpica/accommon.h"
+#include "acpica/actables.h"
+
static struct config_group *acpi_table_group;
struct acpi_table {
struct config_item cfg;
struct acpi_table_header *header;
+ u32 index;
};
static ssize_t acpi_table_aml_write(struct config_item *cfg,
@@ -52,7 +56,11 @@ static ssize_t acpi_table_aml_write(struct config_item *cfg,
if (!table->header)
return -ENOMEM;
- ret = acpi_load_table(table->header);
+ ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
+ ret = acpi_tb_install_and_load_table(
+ ACPI_PTR_TO_PHYSADDR(table->header),
+ ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, FALSE,
+ &table->index);
if (ret) {
kfree(table->header);
table->header = NULL;
@@ -215,8 +223,18 @@ static struct config_item *acpi_table_make_item(struct config_group *group,
return &table->cfg;
}
+static void acpi_table_drop_item(struct config_group *group,
+ struct config_item *cfg)
+{
+ struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
+
+ ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
+ acpi_tb_unload_table(table->index);
+}
+
struct configfs_group_operations acpi_table_group_ops = {
.make_item = acpi_table_make_item,
+ .drop_item = acpi_table_drop_item,
};
static struct config_item_type acpi_tables_type = {