Hi, According to the ACPI spec, ACPI NVS memory region is required to be saved/restored by OS during hibernation. Section 15.3.2 ACPI Spec 3.0b, "OSPM will call the _PTS control method some time before entering a sleeping state, to allow the platform’s AML code to update this memory image before entering the sleeping state. After the system awakes from an S4 state, OSPM will restore this memory area and call the _WAK control method to enable the BIOS to reclaim its memory image." This patch set add the mechanism to save/restore ACPI NVS memory during hibernation. Patch 01: call platform_begin before swsusp_shrink_memory. So that we can allocate enough pages for ACPI NVS memory before shrink the memory. Patch 02: introduce the mechanism to save/restore ACPI NVS memory. Patch 03/04: mark the ACPI NVS memory region on both x86_64 and x86_32 platform. As patch 01 changes the generic code, I don't know if there are any side effects introduced by this patch, and I'm not able to test on other platforms. But with Rafael's suggestion, patch 01 can be optionally dropped because we can use the the I/O and spare pages reserved, which is 5MB at present and the NVS memory is usually tens of pages during my test. Any comments are welcome. :) thanks, rui -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
