[SeaBIOS] Alt SeaBIOS SSDT cpu hotplug
Liu, Jinsong
jinsong.liu at intel.com
Fri Jul 9 18:41:18 CEST 2010
Kevin O'Connor wrote:
> On Thu, Jul 08, 2010 at 09:19:13PM +0800, Liu, Jinsong wrote:
>> Avi Kivity wrote:
>>> Very nice. I thought about doing this but abandoned it as
>>> unmaintainable. Using external functions and the ID variable,
>>> however, reduces the mess to tolerable proportions, and gains us a
>>> lot of flexibility. We can now have any combinations of sockets and
>>> installed cpus.
>>
>> Agree, only 1 concern
>> will it bring debugable/ scalable issue by hardcode aml code?
>
> I've updated the patch (see below). This version documents how one
> can build a new version of the Processor() ssdt snippet.
>
> I've tested this under linux - there were a few bugs in the previous
> patch. I also had to replace the dynamically created CPUS array with
> a dynamically created NTFY method - which is a bit more complicated.
>
> -Kevin
>
>
Yeah, thanks Kevin.
After you done patch and draft test, our QA may do nightly test.
Thanks,
Jinsong
> diff --git a/src/acpi-dsdt.dsl b/src/acpi-dsdt.dsl
> index cc31112..24674fc 100644
> --- a/src/acpi-dsdt.dsl
> +++ b/src/acpi-dsdt.dsl
> @@ -648,6 +648,78 @@ DefinitionBlock (
> Zero /* reserved */
> })
>
> + /* CPU hotplug */
> + Scope(\_SB) {
> + /* Objects filled in by run-time generated SSDT */
> + External(NTFY, MethodObj)
> + External(CPON, PkgObj)
> +
> + /* Methods called by run-time generated SSDT Processor
> objects */ + Method (CPMA, 1, NotSerialized) {
> + // _MAT method - create an madt apic buffer
> + // Local0 = CPON flag for this cpu
> + Store(DerefOf(Index(CPON, Arg0)), Local0)
> + // Local1 = Buffer (in madt apic form) to return
> + Store(Buffer(8) {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0},
> Local1) + // Update the processor id, lapic id, and
> enable/disable status + Store(Arg0, Index(Local1, 2))
> + Store(Arg0, Index(Local1, 3))
> + Store(Local0, Index(Local1, 4))
> + Return (Local1)
> + }
> + Method (CPST, 1, NotSerialized) {
> + // _STA method - return ON status of cpu
> + // Local0 = CPON flag for this cpu
> + Store(DerefOf(Index(CPON, Arg0)), Local0)
> + If (Local0) { Return(0xF) } Else { Return(0x0) }
> + }
> + Method (CPEJ, 2, NotSerialized) {
> + // _EJ0 method - eject callback
> + Sleep (0xC8)
> + }
> +
> + /* CPU hotplug notify method */
> + OperationRegion(PRST, SystemIO, 0xaf00, 32)
> + Field (PRST, ByteAcc, NoLock, Preserve)
> + {
> + PRS, 256
> + }
> + Method(PRSC, 0) {
> + // Local5 = active cpu bitmap
> + Store (PRS, Local5)
> + // Local2 = last read byte from bitmap
> + Store (Zero, Local2)
> + // Local0 = cpuid iterator
> + Store (Zero, Local0)
> + While (LLess(Local0, SizeOf(CPON))) {
> + // Local1 = CPON flag for this cpu
> + Store(DerefOf(Index(CPON, Local0)), Local1)
> + If (And(Local0, 0x07)) {
> + // Shift down previously read bitmap byte
> + ShiftRight(Local2, 1, Local2)
> + } Else {
> + // Read next byte from cpu bitmap
> + Store(DerefOf(Index(Local5, ShiftRight(Local0,
> 3))), Local2) + }
> + // Local3 = active state for this cpu
> + Store(And(Local2, 1), Local3)
> +
> + If (LNotEqual(Local1, Local3)) {
> + // State change - update CPON with new state
> + Store(Local3, Index(CPON, Local0))
> + // Do CPU notify
> + If (LEqual(Local3, 1)) {
> + NTFY(Local0, 1)
> + } Else {
> + NTFY(Local0, 3)
> + }
> + }
> + Increment(Local0)
> + }
> + Return(One)
> + }
> + }
> +
> Scope (\_GPE)
> {
> Name(_HID, "ACPI0006")
> @@ -701,7 +773,8 @@ DefinitionBlock (
>
> }
> Method(_L02) {
> - Return(0x01)
> + // CPU hotplug event
> + Return(\_SB.PRSC())
> }
> Method(_L03) {
> Return(0x01)
> diff --git a/src/acpi.c b/src/acpi.c
> index 0559443..082ef73 100644
> --- a/src/acpi.c
> +++ b/src/acpi.c
> @@ -406,16 +406,56 @@ build_madt(void)
> return madt;
> }
>
> +// Encode a hex value
> +static inline char getHex(u32 val) {
> + val &= 0x0f;
> + return (val <= 9) ? ('0' + val) : ('A' + val - 10);
> +}
> +
> +// Encode a length in an SSDT.
> +static u8 *
> +encodeLen(u8 *ssdt_ptr, int length, int bytes)
> +{
> + if (bytes <= 1) {
> + *ssdt_ptr = length & 0x3f;
> + return ssdt_ptr+1;
> + }
> + ssdt_ptr[0] = (((bytes-1) & 0x3) << 6) | (length & 0x0f);
> + ssdt_ptr[1] = ((length >> 4) & 0xff);
> + ssdt_ptr[2] = ((length >> 12) & 0xff);
> + ssdt_ptr[3] = ((length >> 20) & 0xff);
> + return ssdt_ptr + bytes;
> +}
> +
> +// AML Processor() object. See src/ssdt-proc.dsl for info.
> +static unsigned char ssdt_proc[] = {
> + 0x5b,0x83,0x43,0x05,0x43,0x50,0x41,0x41,
> + 0xaa,0x10,0xb0,0x00,0x00,0x06,0x08,0x49,
> + 0x44,0x5f,0x5f,0x0a,0xaa,0x08,0x5f,0x48,
> + 0x49,0x44,0x0d,0x41,0x43,0x50,0x49,0x30,
> + 0x30,0x30,0x37,0x00,0x14,0x0f,0x5f,0x4d,
> + 0x41,0x54,0x00,0xa4,0x43,0x50,0x4d,0x41,
> + 0x49,0x44,0x5f,0x5f,0x14,0x0f,0x5f,0x53,
> + 0x54,0x41,0x00,0xa4,0x43,0x50,0x53,0x54,
> + 0x49,0x44,0x5f,0x5f,0x14,0x10,0x5f,0x45,
> + 0x4a,0x30,0x01,0xa4,0x43,0x50,0x45,0x4a,
> + 0x49,0x44,0x5f,0x5f,0x68
> +};
> +#define SD_OFFSET_CPUHEX 6
> +#define SD_OFFSET_CPUID1 8
> +#define SD_OFFSET_CPUID2 20
> +
> #define SSDT_SIGNATURE 0x54445353 // SSDT
> static void*
> build_ssdt(void)
> {
> int acpi_cpus = MaxCountCPUs > 0xff ? 0xff : MaxCountCPUs;
> - // calculate the length of processor block and scope block
> - // excluding PkgLength
> - int cpu_length = 13 * acpi_cpus + 4;
> -
> - int length = sizeof(struct acpi_table_header) + 3 + cpu_length;
> + // length = ssdt header + ScopeOp + procs + CPUS package + CPON
> package + int length = (sizeof(struct acpi_table_header)
> + + (1+3+4)
> + + (acpi_cpus * sizeof(ssdt_proc))
> + + (1+2+5+(12*acpi_cpus))
> + + (1+4+1+2+1+(1*acpi_cpus)));
> u8 *ssdt = malloc_high(length);
> if (! ssdt) {
> warn_noalloc();
> @@ -423,47 +463,66 @@ build_ssdt(void)
> }
>
> u8 *ssdt_ptr = ssdt;
> - ssdt_ptr[9] = 0; // checksum;
> ssdt_ptr += sizeof(struct acpi_table_header);
>
> // build processor scope header
> *(ssdt_ptr++) = 0x10; // ScopeOp
> - if (cpu_length <= 0x3e) {
> - /* Handle 1-4 CPUs with one byte encoding */
> - *(ssdt_ptr++) = cpu_length + 1;
> - } else {
> - /* Handle 5-314 CPUs with two byte encoding */
> - *(ssdt_ptr++) = 0x40 | ((cpu_length + 2) & 0xf);
> - *(ssdt_ptr++) = (cpu_length + 2) >> 4;
> - }
> + ssdt_ptr = encodeLen(ssdt_ptr, length-1, 3);
> *(ssdt_ptr++) = '_'; // Name
> - *(ssdt_ptr++) = 'P';
> - *(ssdt_ptr++) = 'R';
> + *(ssdt_ptr++) = 'S';
> + *(ssdt_ptr++) = 'B';
> *(ssdt_ptr++) = '_';
>
> - // build object for each processor
> + // build Processor object for each processor
> int i;
> for (i=0; i<acpi_cpus; i++) {
> - *(ssdt_ptr++) = 0x5B; // ProcessorOp
> - *(ssdt_ptr++) = 0x83;
> - *(ssdt_ptr++) = 0x0B; // Length
> - *(ssdt_ptr++) = 'C'; // Name (CPUxx)
> - *(ssdt_ptr++) = 'P';
> - if ((i & 0xf0) != 0)
> - *(ssdt_ptr++) = (i >> 4) < 0xa ? (i >> 4) + '0' : (i >>
> 4) + 'A' - 0xa;
> - else
> - *(ssdt_ptr++) = 'U';
> - *(ssdt_ptr++) = (i & 0xf) < 0xa ? (i & 0xf) + '0' : (i &
> 0xf) + 'A' - 0xa; + memcpy(ssdt_ptr, ssdt_proc,
> sizeof(ssdt_proc)); + ssdt_ptr[SD_OFFSET_CPUHEX] = getHex(i >>
> 4); + ssdt_ptr[SD_OFFSET_CPUHEX+1] = getHex(i);
> + ssdt_ptr[SD_OFFSET_CPUID1] = i;
> + ssdt_ptr[SD_OFFSET_CPUID2] = i;
> + ssdt_ptr += sizeof(ssdt_proc);
> + }
> +
> + // build "Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00,
> Arg1)} ...}" + *(ssdt_ptr++) = 0x14; // MethodOp
> + ssdt_ptr = encodeLen(ssdt_ptr, 2+5+(12*acpi_cpus), 2);
> + *(ssdt_ptr++) = 'N';
> + *(ssdt_ptr++) = 'T';
> + *(ssdt_ptr++) = 'F';
> + *(ssdt_ptr++) = 'Y';
> + *(ssdt_ptr++) = 0x02;
> + for (i=0; i<acpi_cpus; i++) {
> + *(ssdt_ptr++) = 0xA0; // IfOp
> + ssdt_ptr = encodeLen(ssdt_ptr, 11, 1);
> + *(ssdt_ptr++) = 0x93; // LEqualOp
> + *(ssdt_ptr++) = 0x68; // Arg0Op
> + *(ssdt_ptr++) = 0x0A; // BytePrefix
> *(ssdt_ptr++) = i;
> - *(ssdt_ptr++) = 0x10; // Processor block address
> - *(ssdt_ptr++) = 0xb0;
> - *(ssdt_ptr++) = 0;
> - *(ssdt_ptr++) = 0;
> - *(ssdt_ptr++) = 6; // Processor block length
> + *(ssdt_ptr++) = 0x86; // NotifyOp
> + *(ssdt_ptr++) = 'C';
> + *(ssdt_ptr++) = 'P';
> + *(ssdt_ptr++) = getHex(i >> 4);
> + *(ssdt_ptr++) = getHex(i);
> + *(ssdt_ptr++) = 0x69; // Arg1Op
> }
>
> + // build "Name(CPON, Package() { One, One, ..., Zero, Zero, ...
> })" + *(ssdt_ptr++) = 0x08; // NameOp
> + *(ssdt_ptr++) = 'C';
> + *(ssdt_ptr++) = 'P';
> + *(ssdt_ptr++) = 'O';
> + *(ssdt_ptr++) = 'N';
> + *(ssdt_ptr++) = 0x12; // PackageOp
> + ssdt_ptr = encodeLen(ssdt_ptr, 2+1+(1*acpi_cpus), 2);
> + *(ssdt_ptr++) = acpi_cpus;
> + for (i=0; i<acpi_cpus; i++)
> + *(ssdt_ptr++) = (i < CountCPUs) ? 0x01 : 0x00;
> +
> build_header((void*)ssdt, SSDT_SIGNATURE, ssdt_ptr - ssdt, 1);
>
> + hexdump(ssdt, ssdt_ptr - ssdt);
> +
> return ssdt;
> }
>
> diff --git a/src/ssdt-proc.dsl b/src/ssdt-proc.dsl
> new file mode 100644
> index 0000000..c10d125
> --- /dev/null
> +++ b/src/ssdt-proc.dsl
> @@ -0,0 +1,50 @@
> +/* This file is the basis for the ssdt_proc[] variable in src/acpi.c.
> + * It defines the contents of the per-cpu Processor() object. At
> + * runtime, a dynamically generated SSDT will contain one copy of
> this + * AML snippet for every possible cpu in the system. The
> objects will + * be placed in the \_SB_ namespace.
> + *
> + * To generate a new ssdt_proc[], run the commands:
> + * cpp -P src/ssdt-proc.dsl > out/ssdt-proc.dsl.i
> + * iasl -ta -p out/ssdt-proc out/ssdt-proc.dsl.i
> + * tail -c +37 < out/ssdt-proc.aml | hexdump -e '" " 8/1
> "0x%02x," "\n"' + * and then cut-and-paste the output into the
> src/acpi.c ssdt_proc[] + * array.
> + *
> + * In addition to the aml code generated from this file, the
> + * src/acpi.c file creates a NTFY method with an entry for each cpu:
> + * Method(NTFY, 2) {
> + * If (LEqual(Arg0, 0x00)) { Notify(CP00, Arg1) }
> + * If (LEqual(Arg0, 0x01)) { Notify(CP01, Arg1) }
> + * ...
> + * }
> + * and a CPON array with the list of active and inactive cpus:
> + * Name(CPON, Package() { One, One, ..., Zero, Zero, ... })
> + */
> +DefinitionBlock ("ssdt-proc.aml", "SSDT", 0x01, "BXPC", "BXSSDT",
> 0x1) +/* V------------------ DO NOT EDIT ------------------V */
> +{
> + Processor (CPAA, 0xAA, 0x0000b010, 0x06) {
> + Name (ID, 0xAA)
> +/* ^------------------ DO NOT EDIT ------------------^
> + *
> + * The src/acpi.c code requires the above layout so that it can
> update + * CPAA and 0xAA with the appropriate CPU id (see
> SD_OFFSET_CPUHEX, + * CPUID1, CPUID2). Don't change the above
> without also updating the + * C code.
> + */
> + Name (_HID, "ACPI0007")
> + External(CPMA, MethodObj)
> + External(CPST, MethodObj)
> + External(CPEJ, MethodObj)
> + Method(_MAT, 0) {
> + Return(CPMA(ID))
> + }
> + Method (_STA, 0) {
> + Return(CPST(ID))
> + }
> + Method (_EJ0, 1, NotSerialized) {
> + Return(CPEJ(ID, Arg0))
> + }
> + }
> +}
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