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path: root/drivers/acpi/acpi_memhotplug.c
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Diffstat (limited to 'drivers/acpi/acpi_memhotplug.c')
-rw-r--r--drivers/acpi/acpi_memhotplug.c193
1 files changed, 86 insertions, 107 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 24c807f96636..eb30e5ab4cab 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -31,6 +31,7 @@
#include <linux/types.h>
#include <linux/memory_hotplug.h>
#include <linux/slab.h>
+#include <linux/acpi.h>
#include <acpi/acpi_drivers.h>
#define ACPI_MEMORY_DEVICE_CLASS "memory"
@@ -78,6 +79,7 @@ struct acpi_memory_info {
unsigned short caching; /* memory cache attribute */
unsigned short write_protect; /* memory read/write attribute */
unsigned int enabled:1;
+ unsigned int failed:1;
};
struct acpi_memory_device {
@@ -86,8 +88,6 @@ struct acpi_memory_device {
struct list_head res_list;
};
-static int acpi_hotmem_initialized;
-
static acpi_status
acpi_memory_get_resource(struct acpi_resource *resource, void *context)
{
@@ -125,12 +125,20 @@ acpi_memory_get_resource(struct acpi_resource *resource, void *context)
return AE_OK;
}
+static void
+acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
+{
+ struct acpi_memory_info *info, *n;
+
+ list_for_each_entry_safe(info, n, &mem_device->res_list, list)
+ kfree(info);
+ INIT_LIST_HEAD(&mem_device->res_list);
+}
+
static int
acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
{
acpi_status status;
- struct acpi_memory_info *info, *n;
-
if (!list_empty(&mem_device->res_list))
return 0;
@@ -138,9 +146,7 @@ acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
acpi_memory_get_resource, mem_device);
if (ACPI_FAILURE(status)) {
- list_for_each_entry_safe(info, n, &mem_device->res_list, list)
- kfree(info);
- INIT_LIST_HEAD(&mem_device->res_list);
+ acpi_memory_free_device_resources(mem_device);
return -EINVAL;
}
@@ -170,7 +176,7 @@ acpi_memory_get_device(acpi_handle handle,
/* Get the parent device */
result = acpi_bus_get_device(phandle, &pdevice);
if (result) {
- printk(KERN_WARNING PREFIX "Cannot get acpi bus device");
+ acpi_handle_warn(phandle, "Cannot get acpi bus device\n");
return -EINVAL;
}
@@ -180,14 +186,14 @@ acpi_memory_get_device(acpi_handle handle,
*/
result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
if (result) {
- printk(KERN_WARNING PREFIX "Cannot add acpi bus");
+ acpi_handle_warn(handle, "Cannot add acpi bus\n");
return -EINVAL;
}
end:
*mem_device = acpi_driver_data(device);
if (!(*mem_device)) {
- printk(KERN_ERR "\n driver data not found");
+ dev_err(&device->dev, "driver data not found\n");
return -ENODEV;
}
@@ -224,7 +230,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
/* Get the range from the _CRS */
result = acpi_memory_get_device_resources(mem_device);
if (result) {
- printk(KERN_ERR PREFIX "get_device_resources failed\n");
+ dev_err(&mem_device->device->dev,
+ "get_device_resources failed\n");
mem_device->state = MEMORY_INVALID_STATE;
return result;
}
@@ -251,13 +258,27 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
node = memory_add_physaddr_to_nid(info->start_addr);
result = add_memory(node, info->start_addr, info->length);
- if (result)
+
+ /*
+ * If the memory block has been used by the kernel, add_memory()
+ * returns -EEXIST. If add_memory() returns the other error, it
+ * means that this memory block is not used by the kernel.
+ */
+ if (result && result != -EEXIST) {
+ info->failed = 1;
continue;
- info->enabled = 1;
+ }
+
+ if (!result)
+ info->enabled = 1;
+ /*
+ * Add num_enable even if add_memory() returns -EEXIST, so the
+ * device is bound to this driver.
+ */
num_enabled++;
}
if (!num_enabled) {
- printk(KERN_ERR PREFIX "add_memory failed\n");
+ dev_err(&mem_device->device->dev, "add_memory failed\n");
mem_device->state = MEMORY_INVALID_STATE;
return -EINVAL;
}
@@ -272,68 +293,31 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
return 0;
}
-static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
+static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
{
- acpi_status status;
- struct acpi_object_list arg_list;
- union acpi_object arg;
- unsigned long long current_status;
-
-
- /* Issue the _EJ0 command */
- arg_list.count = 1;
- arg_list.pointer = &arg;
- arg.type = ACPI_TYPE_INTEGER;
- arg.integer.value = 1;
- status = acpi_evaluate_object(mem_device->device->handle,
- "_EJ0", &arg_list, NULL);
- /* Return on _EJ0 failure */
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed"));
- return -ENODEV;
- }
-
- /* Evalute _STA to check if the device is disabled */
- status = acpi_evaluate_integer(mem_device->device->handle, "_STA",
- NULL, &current_status);
- if (ACPI_FAILURE(status))
- return -ENODEV;
-
- /* Check for device status. Device should be disabled */
- if (current_status & ACPI_STA_DEVICE_ENABLED)
- return -EINVAL;
+ int result = 0;
+ struct acpi_memory_info *info, *n;
- return 0;
-}
+ list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
+ if (info->failed)
+ /* The kernel does not use this memory block */
+ continue;
-static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
-{
- int result;
- struct acpi_memory_info *info, *n;
+ if (!info->enabled)
+ /*
+ * The kernel uses this memory block, but it may be not
+ * managed by us.
+ */
+ return -EBUSY;
+ result = remove_memory(info->start_addr, info->length);
+ if (result)
+ return result;
- /*
- * Ask the VM to offline this memory range.
- * Note: Assume that this function returns zero on success
- */
- list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
- if (info->enabled) {
- result = remove_memory(info->start_addr, info->length);
- if (result)
- return result;
- }
+ list_del(&info->list);
kfree(info);
}
- /* Power-off and eject the device */
- result = acpi_memory_powerdown_device(mem_device);
- if (result) {
- /* Set the status of the device to invalid */
- mem_device->state = MEMORY_INVALID_STATE;
- return result;
- }
-
- mem_device->state = MEMORY_POWER_OFF_STATE;
return result;
}
@@ -341,6 +325,7 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_memory_device *mem_device;
struct acpi_device *device;
+ struct acpi_eject_event *ej_event = NULL;
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
switch (event) {
@@ -353,7 +338,7 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"\nReceived DEVICE CHECK notification for device\n"));
if (acpi_memory_get_device(handle, &mem_device)) {
- printk(KERN_ERR PREFIX "Cannot find driver data\n");
+ acpi_handle_err(handle, "Cannot find driver data\n");
break;
}
@@ -361,7 +346,7 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
break;
if (acpi_memory_enable_device(mem_device)) {
- printk(KERN_ERR PREFIX "Cannot enable memory device\n");
+ acpi_handle_err(handle,"Cannot enable memory device\n");
break;
}
@@ -373,40 +358,28 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
"\nReceived EJECT REQUEST notification for device\n"));
if (acpi_bus_get_device(handle, &device)) {
- printk(KERN_ERR PREFIX "Device doesn't exist\n");
+ acpi_handle_err(handle, "Device doesn't exist\n");
break;
}
mem_device = acpi_driver_data(device);
if (!mem_device) {
- printk(KERN_ERR PREFIX "Driver Data is NULL\n");
+ acpi_handle_err(handle, "Driver Data is NULL\n");
break;
}
- /*
- * Currently disabling memory device from kernel mode
- * TBD: Can also be disabled from user mode scripts
- * TBD: Can also be disabled by Callback registration
- * with generic sysfs driver
- */
- if (acpi_memory_disable_device(mem_device)) {
- printk(KERN_ERR PREFIX "Disable memory device\n");
- /*
- * If _EJ0 was called but failed, _OST is not
- * necessary.
- */
- if (mem_device->state == MEMORY_INVALID_STATE)
- return;
-
+ ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
+ if (!ej_event) {
+ pr_err(PREFIX "No memory, dropping EJECT\n");
break;
}
- /*
- * TBD: Invoke acpi_bus_remove to cleanup data structures
- */
+ ej_event->handle = handle;
+ ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
+ acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
+ (void *)ej_event);
- /* _EJ0 succeeded; _OST is not necessary */
+ /* eject is performed asynchronously */
return;
-
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
@@ -420,6 +393,15 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
return;
}
+static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
+{
+ if (!mem_device)
+ return;
+
+ acpi_memory_free_device_resources(mem_device);
+ kfree(mem_device);
+}
+
static int acpi_memory_device_add(struct acpi_device *device)
{
int result;
@@ -449,23 +431,16 @@ static int acpi_memory_device_add(struct acpi_device *device)
/* Set the device state */
mem_device->state = MEMORY_POWER_ON_STATE;
- printk(KERN_DEBUG "%s \n", acpi_device_name(device));
-
- /*
- * Early boot code has recognized memory area by EFI/E820.
- * If DSDT shows these memory devices on boot, hotplug is not necessary
- * for them. So, it just returns until completion of this driver's
- * start up.
- */
- if (!acpi_hotmem_initialized)
- return 0;
+ pr_debug("%s\n", acpi_device_name(device));
if (!acpi_memory_check_device(mem_device)) {
/* call add_memory func */
result = acpi_memory_enable_device(mem_device);
- if (result)
- printk(KERN_ERR PREFIX
+ if (result) {
+ dev_err(&device->dev,
"Error in acpi_memory_enable_device\n");
+ acpi_memory_device_free(mem_device);
+ }
}
return result;
}
@@ -473,13 +448,18 @@ static int acpi_memory_device_add(struct acpi_device *device)
static int acpi_memory_device_remove(struct acpi_device *device, int type)
{
struct acpi_memory_device *mem_device = NULL;
-
+ int result;
if (!device || !acpi_driver_data(device))
return -EINVAL;
mem_device = acpi_driver_data(device);
- kfree(mem_device);
+
+ result = acpi_memory_remove_memory(mem_device);
+ if (result)
+ return result;
+
+ acpi_memory_device_free(mem_device);
return 0;
}
@@ -568,7 +548,6 @@ static int __init acpi_memory_device_init(void)
return -ENODEV;
}
- acpi_hotmem_initialized = 1;
return 0;
}