From: KAMEZAWA Hiroyuki Current acpi memory hotplug just looks into the first entry of resources in _CRS. But, _CRS can contain plural resources. So, if _CRS contains plural resoureces, acpi memory hot add cannot add all memory. With this patch, acpi memory hotplug can deal with Memory Device, whose _CRS contains plural resources. Tested on ia64 memory hotplug test envrionment (not emulation, uses alpha version firmware which supports dynamic reconfiguration of NUMA.) Note: Microsoft's Windows Server 2003 requires big (>4G)resoureces to be divided into small (<4G) resources. looks crazy, but not invalid. (See http://www.microsoft.com/whdc/system/pnppwr/hotadd/hotaddmem.mspx) For this reason, a firmware vendor who supports Windows writes plural resources in a _CRS even if they are contiguous. Signed-off-by: Kenji Kaneshige Signed-off-by: KAMEZAWA Hiroyuki Cc: "Brown, Len" Signed-off-by: Andrew Morton --- drivers/acpi/acpi_memhotplug.c | 108 ++++++++++++++++++++++--------- 1 file changed, 77 insertions(+), 31 deletions(-) diff -puN drivers/acpi/acpi_memhotplug.c~acpi-memory-hotplug-cannot-manage-_crs-with-plural-resoureces drivers/acpi/acpi_memhotplug.c --- devel/drivers/acpi/acpi_memhotplug.c~acpi-memory-hotplug-cannot-manage-_crs-with-plural-resoureces 2006-06-01 20:17:05.000000000 -0700 +++ devel-akpm/drivers/acpi/acpi_memhotplug.c 2006-06-01 20:17:05.000000000 -0700 @@ -68,42 +68,73 @@ static struct acpi_driver acpi_memory_de }, }; +struct acpi_memory_info { + struct list_head list; + u64 start_addr; /* Memory Range start physical addr */ + u64 length; /* Memory Range length */ + unsigned short caching; /* memory cache attribute */ + unsigned short write_protect; /* memory read/write attribute */ + unsigned int enabled:1; +}; + struct acpi_memory_device { acpi_handle handle; unsigned int state; /* State of the memory device */ - unsigned short caching; /* memory cache attribute */ - unsigned short write_protect; /* memory read/write attribute */ - u64 start_addr; /* Memory Range start physical addr */ - u64 length; /* Memory Range length */ + struct list_head res_list; }; +static acpi_status +acpi_memory_get_resource(struct acpi_resource *resource, void *context) +{ + struct acpi_memory_device *mem_device = context; + struct acpi_resource_address64 address64; + struct acpi_memory_info *info, *new; + acpi_status status; + + status = acpi_resource_to_address64(resource, &address64); + if (ACPI_FAILURE(status) || + (address64.resource_type != ACPI_MEMORY_RANGE)) + return AE_OK; + + list_for_each_entry(info, &mem_device->res_list, list) { + /* Can we combine the resource range information? */ + if ((info->caching == address64.info.mem.caching) && + (info->write_protect == address64.info.mem.write_protect) && + (info->start_addr + info->length == address64.minimum)) { + info->length += address64.address_length; + return AE_OK; + } + } + + new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); + if (!new) + return AE_ERROR; + + INIT_LIST_HEAD(&new->list); + new->caching = address64.info.mem.caching; + new->write_protect = address64.info.mem.write_protect; + new->start_addr = address64.minimum; + new->length = address64.address_length; + list_add_tail(&new->list, &mem_device->res_list); + + return AE_OK; +} + static int acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) { acpi_status status; - struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - struct acpi_resource *resource = NULL; - struct acpi_resource_address64 address64; + struct acpi_memory_info *info, *n; /* Get the range from the _CRS */ - status = acpi_get_current_resources(mem_device->handle, &buffer); - if (ACPI_FAILURE(status)) + status = acpi_walk_resources(mem_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); return -EINVAL; - - resource = (struct acpi_resource *)buffer.pointer; - status = acpi_resource_to_address64(resource, &address64); - if (ACPI_SUCCESS(status)) { - if (address64.resource_type == ACPI_MEMORY_RANGE) { - /* Populate the structure */ - mem_device->caching = address64.info.mem.caching; - mem_device->write_protect = - address64.info.mem.write_protect; - mem_device->start_addr = address64.minimum; - mem_device->length = address64.address_length; - } } - kfree(buffer.pointer); return 0; } @@ -174,7 +205,8 @@ static int acpi_memory_check_device(stru static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) { - int result; + int result, num_enabled = 0; + struct acpi_memory_info *info; /* Get the range from the _CRS */ result = acpi_memory_get_device_resources(mem_device); @@ -187,12 +219,21 @@ static int acpi_memory_enable_device(str /* * Tell the VM there is more memory here... * Note: Assume that this function returns zero on success + * We don't have memory-hot-add rollback function,now. + * (i.e. memory-hot-remove function) */ - result = add_memory(mem_device->start_addr, mem_device->length); - if (result) { + list_for_each_entry(info, &mem_device->res_list, list) { + result = add_memory(info->start_addr, info->length); + if (result) + continue; + info->enabled = 1; + num_enabled++; + } + + if (!num_enabled) { ACPI_ERROR((AE_INFO, "add_memory failed")); mem_device->state = MEMORY_INVALID_STATE; - return result; + return -EINVAL; } return result; @@ -234,16 +275,20 @@ static int acpi_memory_powerdown_device( static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) { int result; - u64 start = mem_device->start_addr; - u64 len = mem_device->length; + struct acpi_memory_info *info, *n; /* * Ask the VM to offline this memory range. * Note: Assume that this function returns zero on success */ - result = remove_memory(start, len); - if (result) - return result; + 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); + } /* Power-off and eject the device */ result = acpi_memory_powerdown_device(mem_device); @@ -330,6 +375,7 @@ static int acpi_memory_device_add(struct return -ENOMEM; memset(mem_device, 0, sizeof(struct acpi_memory_device)); + INIT_LIST_HEAD(&mem_device->res_list); mem_device->handle = device->handle; sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); _