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>

diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c
index 146a77fb762d5b3083d68fc1774ba01ae5f127a1..853bc7fc673f9fbf9d8655cf78309ec31efce9b5 100644 (file)
--- 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 = {

diff --git a/drivers/acpi/acpica/tbdata.c b/drivers/acpi/acpica/tbdata.c
index 27c5c27d481810ded9d5baf08e63d9005bf2798d..c9d6fa6d7cc6f4470589cfc0a54a3d811de04565 100644 (file)
--- a/drivers/acpi/acpica/tbdata.c
+++ b/drivers/acpi/acpica/tbdata.c
@@ -867,6 +867,8 @@ acpi_tb_install_and_load_table(acpi_physical_address address,
        return_ACPI_STATUS(status);
 }
 
+ACPI_EXPORT_SYMBOL(acpi_tb_install_and_load_table)
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_tb_unload_table
@@ -914,3 +916,5 @@ acpi_status acpi_tb_unload_table(u32 table_index)
        acpi_tb_set_table_loaded_flag(table_index, FALSE);
        return_ACPI_STATUS(status);
 }
+
+ACPI_EXPORT_SYMBOL(acpi_tb_unload_table)