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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-05-08 00:29:49 +0200 |
---|---|---|
committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-05-12 14:14:38 +0200 |
commit | e2ff39400d81233374e780b133496a2296643d7d (patch) | |
tree | 6f96f82ebc9474652a32e7fff8f8d9eb7184eb56 | |
parent | ac212b6980d8d5eda705864fc5a8ecddc6d6eacc (diff) | |
download | op-kernel-dev-e2ff39400d81233374e780b133496a2296643d7d.zip op-kernel-dev-e2ff39400d81233374e780b133496a2296643d7d.tar.gz |
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>
-rw-r--r-- | drivers/acpi/acpi_memhotplug.c | 53 | ||||
-rw-r--r-- | include/linux/memory_hotplug.h | 2 | ||||
-rw-r--r-- | mm/memory_hotplug.c | 4 |
3 files changed, 55 insertions, 4 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index 5e6301e..5590db1 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"); diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 3e622c6..2975b7b 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -245,6 +245,8 @@ static inline int is_mem_section_removable(unsigned long pfn, static inline void try_offline_node(int nid) {} #endif /* CONFIG_MEMORY_HOTREMOVE */ +extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, + void *arg, int (*func)(struct memory_block *, void *)); extern int mem_online_node(int nid); extern int add_memory(int nid, u64 start, u64 size); extern int arch_add_memory(int nid, u64 start, u64 size); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a221fac..5ea1287 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1618,6 +1618,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages) { return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); } +#endif /* CONFIG_MEMORY_HOTREMOVE */ /** * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) @@ -1631,7 +1632,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages) * * Returns the return value of func. */ -static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, +int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, void *arg, int (*func)(struct memory_block *, void *)) { struct memory_block *mem = NULL; @@ -1668,6 +1669,7 @@ static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, return 0; } +#ifdef CONFIG_MEMORY_HOTREMOVE /** * offline_memory_block_cb - callback function for offlining memory block * @mem: the memory block to be offlined |