On Tue, 6 Jun 2006 18:25:27 -0700 Bryce Harrington <bryce at osdl.org> wrote: > Could you point us at docs for using acpi for doing the hotplug mem add? > I'll post my emulation patches and README in reply to this mail. I know my illustration skill is not good enough to write long description. please ask if something is unclear. [0/3] illustration, how to use [1/3] acpi_sci_emulation patch [2/3] acpi_memoryhotplug_emulation patch [3/3] hide system ram patch Thanks, -Kame README == 1. How to make the kernel for ACPI emulation For acpi emulation, you have to write acpi's AML by yourself. see also http://acpi.sourceforge.net/ , there are misc useful information. 1-1 download tools you need acpi compiler tools download ACPI CA - Unix Build Environment (.TAR.GZ 819KB) from http://www.intel.com/technology/iapc/acpi/downloads.htm [kamezawa at casares src]$ tar xpzf acpica-unix-20060512.tar.gz [kamezawa at casares src]$ cd acpica-unix-20060512 [kamezawa at casares acpica-unix-20060512]$ cd compiler/ [kamezawa at casares compiler]$ make you get 'iasl' 1-2 get your machine's original acpi DSDT information [kamezawa at casares compiler]$ su Password: [root at casares compiler]# cat /proc/acpi/dsdt > dsdt.org 1-3 Because dsdt.org is binary, you have to decompile it. [kamezawa at casares compiler]$ iasl -d dsdt.org you get dsdt.dsl. this is human readble. 1-4 modify dsdt as you want modify dsdt.dsl by hand (how to modify will be described later.) 1-5 compile your dsdt [kamezawa at casares compiler]$ iasl -tc dsdt.dsl 'dsdt.hex' is generated. You have to include this dsdt.hex to linux kernel at compile. 1-6 apply patches to before compiling your kernel You can't do acpi-sci-emulation without patch. apply attached patches to your kernel. [1] acpi_sci_emulation.patch -- emulate notify [2] acpi_memhotplug_emu.patch -- emulate power switch of memory [3] hide-system-ram-resource.patch -- hide system ram information for avoiding conflicts 1-7 configure your custom kernel At first, say N (remove check) here: Device Drivers ---> Generic Driver Options ---> [ ] Select only drivers that don't need compile-time external firmware Then, you can include your custom firmware. Check this: Power management and ACPI ---> ACPI (Advanced Configuration and Power Interface) Support ---> [ ] Include Custom DSDT (NEW) Then, () Custom DSDT Table file to include (NEW) will appear. give the name of your custom 'dsdt.hex' file created in 1-5. And check this: [] ACPI SCI Event Emulation Support 1-8 make your kernel 2. How to edit DSDT for acpi memory hotplug. For details, please read acpi spec. This is test case for my environment. I know my hardware(tiger4)'s memory is organized as 0-2G 4-8G 10-12G. But, be careful to efi's real memory map. you can get it from /proc/iomem (of unmodified kernel) == [kamezawa at casares linux-2.6.17-rc5-mm2]$ cat /proc/iomem | grep System 00000000-00000fff : System RAM 00001000-00006fff : System RAM 00007000-00008fff : System RAM 00009000-00081fff : System RAM 00084000-00084fff : System RAM 00085000-0009ffff : System RAM 00100000-03ffffff : System RAM 04000000-04a83fff : System RAM 04a84000-0ff7ffff : System RAM 0ff80000-0fffffff : System RAM 10000000-7d8fffff : System RAM 7d900000-7f97ffff : System RAM 7f980000-7f9fffff : System RAM 7fe96000-7ff39fff : System RAM 7ff3a000-7ff41fff : System RAM 100000000-1ffffdfff : System RAM 280000000-2fedf3fff : System RAM 2fedf4000-2fedf9fff : System RAM 2fedfa000-2fedfafff : System RAM 2fedfb000-2fef59fff : System RAM 2fef5a000-2fefb1fff : System RAM 2fefb2000-2fefb9fff : System RAM 2fefba000-2feffffff : System RAM 2ff000000-2ff453fff : System RAM 2ff454000-2ff800fff : System RAM 2ff801000-2ff8c5fff : System RAM 2ff8c6000-2ff8c7fff : System RAM 2ff8c8000-2ff8c9fff : System RAM 2ff8ca000-2ff9fbfff : System RAM 2ff9fc000-2ff9fcfff : System RAM 2ff9fd000-2ff9fffff : System RAM 2ffa00000-2ffd85fff : System RAM 2ffd86000-2ffdfffff : System RAM 2ffe00000-2ffe13fff : System RAM 2ffe80000-2fffb9fff : System RAM == How many small regions there are! ;) it looks 4G-7G memory is contiguous. I'd like to add 3 of 1G memory modules at 4G-7G to original DSDT. 1. avoid confliction If your original DSDT has memory object, remove it. it will confilcts. 2. Write Memory object. Memory object is a device of Name(_HID,EISAID("PNP0C80") This is example of hot-pluggable DSDT memory object. put this under _SB object. please see acpi spec for detail. == Scope (\_SB) { <snip> Device(MEM1) { Name(_HID,EISAID("PNP0C80")) Name(_UID, 0) Name (L1st,0) Method(_PXM) { return (0x0) } Method(_STA,0,NotSerialized) { If ( LEqual(L1st,1) ) { Return (0x0f) } else { Return (0x00) } } Method(_PS0, 0, NotSerialized) { Store(1,L1st) } Method(_CRS) { Name(RT0,ResourceTemplate() { QWordMemory(ResourceProducer, PosDecode, MinNotFixed, MaxNotFixed, Cacheable, ReadWrite, 0, 0x100000000, 0x13fffffff, 0, 0x40000000, , , HP30) }) Return (RT0) } } == Above one is an object for memory 4G-5G, MEM1. 3. hot-add-test we want to add 4G- memory fot test. Then, we need to hide 4G- memory from the kernel. boot kernel with max_addr=2G Then, [kamezawa at casares ~]$ cat /proc/meminfo MemTotal: 1925040 kB MemFree: 1529264 kB Buffers: 31712 kB Cached: 181488 kB SwapCached: 0 kB Active: 162400 kB Inactive: 170032 kB Add MEM1 I added to my custom DSDT. == [root at casares kamezawa]# echo MEM1 1 > /proc/acpi/sci/notify [root at casares kamezawa]# ls /sys/devices/system/memory/ block_size_bytes memory0 memory1 memory4 memory4 is added. [root at casares kamezawa]# echo online > /sys/devices/system/memory/memory4/state [root at casares kamezawa]# cat /proc/meminfo MemTotal: 2973616 kB MemFree: 2561712 kB Buffers: 31632 kB Cached: 181568 kB SwapCached: 0 kB .... [root at casares kamezawa]# == Memory increased :)
