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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-05-08 00:29:49 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-05-12 14:14:38 +0200
commite2ff39400d81233374e780b133496a2296643d7d (patch)
tree6f96f82ebc9474652a32e7fff8f8d9eb7184eb56 /drivers/acpi/acpi_memhotplug.c
parentac212b6980d8d5eda705864fc5a8ecddc6d6eacc (diff)
ACPI / memhotplug: Bind removable memory blocks to ACPI device nodes
During ACPI memory hotplug configuration bind memory blocks residing in modules removable through the standard ACPI mechanism to struct acpi_device objects associated with ACPI namespace objects representing those modules. Accordingly, unbind those memory blocks from the struct acpi_device objects when the memory modules in question are being removed. When "offline" operation for devices representing memory blocks is introduced, this will allow the ACPI core's device hot-remove code to use it to carry out remove_memory() for those memory blocks and check the results of that before it actually removes the modules holding them from the system. Since walk_memory_range() is used for accessing all memory blocks corresponding to a given ACPI namespace object, it is exported from memory_hotplug.c so that the code in acpi_memhotplug.c can use it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com> Reviewed-by: Toshi Kani <toshi.kani@hp.com>
Diffstat (limited to 'drivers/acpi/acpi_memhotplug.c')
-rw-r--r--drivers/acpi/acpi_memhotplug.c53
1 files changed, 50 insertions, 3 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 5e6301e94920..5590db12028e 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -28,6 +28,7 @@
*/
#include <linux/acpi.h>
+#include <linux/memory.h>
#include <linux/memory_hotplug.h>
#include "internal.h"
@@ -166,13 +167,50 @@ static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
return 0;
}
+static unsigned long acpi_meminfo_start_pfn(struct acpi_memory_info *info)
+{
+ return PFN_DOWN(info->start_addr);
+}
+
+static unsigned long acpi_meminfo_end_pfn(struct acpi_memory_info *info)
+{
+ return PFN_UP(info->start_addr + info->length-1);
+}
+
+static int acpi_bind_memblk(struct memory_block *mem, void *arg)
+{
+ return acpi_bind_one(&mem->dev, (acpi_handle)arg);
+}
+
+static int acpi_bind_memory_blocks(struct acpi_memory_info *info,
+ acpi_handle handle)
+{
+ return walk_memory_range(acpi_meminfo_start_pfn(info),
+ acpi_meminfo_end_pfn(info), (void *)handle,
+ acpi_bind_memblk);
+}
+
+static int acpi_unbind_memblk(struct memory_block *mem, void *arg)
+{
+ acpi_unbind_one(&mem->dev);
+ return 0;
+}
+
+static void acpi_unbind_memory_blocks(struct acpi_memory_info *info,
+ acpi_handle handle)
+{
+ walk_memory_range(acpi_meminfo_start_pfn(info),
+ acpi_meminfo_end_pfn(info), NULL, acpi_unbind_memblk);
+}
+
static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
{
+ acpi_handle handle = mem_device->device->handle;
int result, num_enabled = 0;
struct acpi_memory_info *info;
int node;
- node = acpi_get_node(mem_device->device->handle);
+ node = acpi_get_node(handle);
/*
* Tell the VM there is more memory here...
* Note: Assume that this function returns zero on success
@@ -203,6 +241,12 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
if (result && result != -EEXIST)
continue;
+ result = acpi_bind_memory_blocks(info, handle);
+ if (result) {
+ acpi_unbind_memory_blocks(info, handle);
+ return -ENODEV;
+ }
+
info->enabled = 1;
/*
@@ -229,10 +273,11 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
{
+ acpi_handle handle = mem_device->device->handle;
int result = 0, nid;
struct acpi_memory_info *info, *n;
- nid = acpi_get_node(mem_device->device->handle);
+ nid = acpi_get_node(handle);
list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
if (!info->enabled)
@@ -240,6 +285,8 @@ static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
if (nid < 0)
nid = memory_add_physaddr_to_nid(info->start_addr);
+
+ acpi_unbind_memory_blocks(info, handle);
result = remove_memory(nid, info->start_addr, info->length);
if (result)
return result;
@@ -300,7 +347,7 @@ static int acpi_memory_device_add(struct acpi_device *device,
if (result) {
dev_err(&device->dev, "acpi_memory_enable_device() error\n");
acpi_memory_device_free(mem_device);
- return -ENODEV;
+ return result;
}
dev_dbg(&device->dev, "Memory device configured by ACPI\n");