From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
The memory device can be removed by 2 ways:
1. send eject request by SCI
2. echo 1 >/sys/bus/pci/devices/PNP0C80:XX/eject
In the 1st case, acpi_memory_disable_device() will be called.
In the 2nd case, acpi_memory_device_remove() will be called.
acpi_memory_device_remove() will also be called when we unbind the
memory device from the driver acpi_memhotplug.
acpi_memory_disable_device() has already implemented a code which
offlines memory and releases acpi_memory_info struct . But
acpi_memory_device_remove() has not implemented it yet.
So the patch implements acpi_memory_remove_memory() for offlining
memory and releasing acpi_memory_info struct. And it is used by both
acpi_memory_device_remove() and acpi_memory_disable_device().
Additionally, if the type is ACPI_BUS_REMOVAL_EJECT in
acpi_memory_device_remove() , it means that the user wants to eject
the memory device. In this case, acpi_memory_device_remove() calls
acpi_memory_remove_memory().
CC: David Rientjes <rientjes@xxxxxxxxxx>
CC: Jiang Liu <liuj97@xxxxxxxxx>
CC: Len Brown <len.brown@xxxxxxxxx>
CC: Christoph Lameter <cl@xxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
CC: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
---
drivers/acpi/acpi_memhotplug.c | 44 +++++++++++++++++++++++++++++++----------
1 file changed, 34 insertions(+), 10 deletions(-)
Index: linux-3.6/drivers/acpi/acpi_memhotplug.c
===================================================================
--- linux-3.6.orig/drivers/acpi/acpi_memhotplug.c 2012-10-03 18:55:33.386378909 +0900
+++ linux-3.6/drivers/acpi/acpi_memhotplug.c 2012-10-03 18:55:58.624380688 +0900
@@ -306,24 +306,37 @@ static int acpi_memory_powerdown_device(
return 0;
}
-static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
+static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
{
int result;
struct acpi_memory_info *info, *n;
+ list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
+ if (!info->enabled)
+ return -EBUSY;
+
+ result = remove_memory(info->start_addr, info->length);
+ if (result)
+ return result;
+
+ list_del(&info->list);
+ kfree(info);
+ }
+
+ return 0;
+}
+
+static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
+{
+ int 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;
- }
- kfree(info);
- }
+ result = acpi_memory_remove_memory(mem_device);
+ if (result)
+ return result;
/* Power-off and eject the device */
result = acpi_memory_powerdown_device(mem_device);
@@ -473,12 +486,23 @@ static int acpi_memory_device_add(struct
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);
+
+ if (type == ACPI_BUS_REMOVAL_EJECT) {
+ /*
+ * offline and remove memory only when the memory device is
+ * ejected.
+ */
+ result = acpi_memory_remove_memory(mem_device);
+ if (result)
+ return result;
+ }
+
kfree(mem_device);
return 0;
--
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