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RDMSR: fix cpu_msrinfo() function with AMD CPUs

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Xorg 2017-02-12 19:19:51 +01:00
parent 9b038c94c4
commit d5c892e002
1 changed files with 42 additions and 44 deletions
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86
libcpuid/rdmsr.c
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@ -612,24 +612,16 @@ static int get_amd_multipliers(struct msr_driver_t* handle, struct cpu_id_t *id,
struct internal_id_info_t *internal,
uint32_t pstate, uint64_t *multiplier)
{
int err;
int i, err;
int divisor = 1;
int magic_constant = 0x10;
static int clock = 0;
uint64_t CpuFid, CpuDid, CpuDidLSD;
double divisor;
if (pstate < MSR_PSTATE_0 || MSR_PSTATE_7 < pstate)
return 1;
switch (id->ext_family) {
case 0x11:
/* BKDG 11h, page 236
MSRC001_00[6B:64][8:6] is CpuDid
MSRC001_00[6B:64][5:0] is CpuFid
CPU COF is ((100 MHz * (CpuFid + 08h)) / (2^CpuDid)) */
err = cpu_rdmsr_range(handle, pstate, 8, 6, &CpuDid);
err += cpu_rdmsr_range(handle, pstate, 5, 0, &CpuFid);
*multiplier = (uint64_t) ((CpuFid + 0x8) / (1ull << CpuDid));
break;
case 0x12:
/* BKDG 12h, page 469
MSRC001_00[6B:64][8:4] is CpuFid
@ -637,29 +629,23 @@ static int get_amd_multipliers(struct msr_driver_t* handle, struct cpu_id_t *id,
CPU COF is (100MHz * (CpuFid + 10h) / (divisor specified by CpuDid)) */
err = cpu_rdmsr_range(handle, pstate, 8, 4, &CpuFid);
err += cpu_rdmsr_range(handle, pstate, 3, 0, &CpuDid);
if (CpuDid == 0x0)
divisor = 1;
else if (CpuDid == 0x1)
divisor = 1.5;
else if (CpuDid == 0x2)
divisor = 2;
else if (CpuDid == 0x3)
divisor = 3;
else if (CpuDid == 0x4)
divisor = 4;
else if (CpuDid == 0x5)
divisor = 6;
else if (CpuDid == 0x6)
divisor = 8;
else if (CpuDid == 0x7)
divisor = 12;
else if (CpuDid == 0x8)
divisor = 16;
else
divisor = 0;
if (divisor > 0)
*multiplier = (uint64_t) ((CpuFid + 0x10) / divisor);
const struct { uint64_t did; double divisor; } divisor_t[] = {
{ 0x0, 1 },
{ 0x1, 1.5 },
{ 0x2, 2 },
{ 0x3, 3 },
{ 0x4, 4 },
{ 0x5, 6 },
{ 0x6, 8 },
{ 0x7, 12 },
{ 0x8, 16 },
{ CpuDid, 0 },
};
i = 0;
while(divisor_t[i].did != CpuDid)
i++;
if (divisor_t[i].divisor > 0)
*multiplier = (uint64_t) ((CpuFid + 0x10) / divisor_t[i].divisor);
else
err++;
break;
@ -676,11 +662,19 @@ static int get_amd_multipliers(struct msr_driver_t* handle, struct cpu_id_t *id,
clock = cpu_clock_measure(100, 1) + 5; // Fake round
*multiplier = (uint64_t) ((clock / 100 + 0x10) / (CpuDid + CpuDidLSD * 0.25 + 1));
break;
case 0x11:
/* BKDG 11h, page 236
MSRC001_00[6B:64][8:6] is CpuDid
MSRC001_00[6B:64][5:0] is CpuFid
CPU COF is ((100 MHz * (CpuFid + 08h)) / (2^CpuDid)) */
magic_constant = 0x8;
case 0x10:
/* BKDG 10h, page 429
MSRC001_00[6B:64][8:6] is CpuDid
MSRC001_00[6B:64][5:0] is CpuFid
CPU COF is (100 MHz * (CpuFid + 10h) / (2^CpuDid)) */
CPU COF is (100 MHz * (CpuFid + 10h) / (2^CpuDid))
N.B.: The (stock) bus speed is 200MHz on AMD 10h & 11h families, we need to divid by 2 */
divisor = 2;
case 0x15:
/* BKDG 15h, page 570/580/635/692 (00h-0Fh/10h-1Fh/30h-3Fh/60h-6Fh)
MSRC001_00[6B:64][8:6] is CpuDid
@ -693,7 +687,7 @@ static int get_amd_multipliers(struct msr_driver_t* handle, struct cpu_id_t *id,
CoreCOF is (100 * (MSRC001_00[6B:64][CpuFid] + 10h) / (2^MSRC001_00[6B:64][CpuDid])) */
err = cpu_rdmsr_range(handle, pstate, 8, 6, &CpuDid);
err += cpu_rdmsr_range(handle, pstate, 5, 0, &CpuFid);
*multiplier = (uint64_t) ((CpuFid + 0x10) / (1ull << CpuDid));
*multiplier = (uint64_t) ((CpuFid + magic_constant) / (1ull << CpuDid)) / divisor;
break;
default:
err = 1;
@ -707,6 +701,7 @@ static double get_info_min_multiplier(struct msr_driver_t* handle, struct cpu_id
struct internal_id_info_t *internal)
{
int err;
uint32_t addr = MSR_PSTATE_7 + 1;
uint64_t reg;
if(id->vendor == VENDOR_INTEL) {
@ -725,11 +720,14 @@ static double get_info_min_multiplier(struct msr_driver_t* handle, struct cpu_id
if (!err) return (double) reg;
}
else if(id->vendor == VENDOR_AMD) {
/* Refer links above
MSRC001_0061[6:4] is PstateMaxVal
PstateMaxVal is the lowest-performance non-boosted P-state */
err = cpu_rdmsr_range(handle, MSR_PSTATE_L, 6, 4, &reg);
err += get_amd_multipliers(handle, id, internal, MSR_PSTATE_0 + (uint32_t) reg, &reg);
/* N.B.: Find the last P-state
MSRC001_00[6B:64][8:0] is { CpuDid, CpuFid }
If all bits are 0 in a given P-state, we can consider the P-state is unused */
do {
addr--;
cpu_rdmsr_range(handle, addr, 8, 0, &reg);
} while((reg == 0x0) && (addr > MSR_PSTATE_0));
err = get_amd_multipliers(handle, id, internal, addr, &reg);
if (!err) return (double) reg;
}
@ -885,9 +883,9 @@ static double get_info_bus_clock(struct msr_driver_t* handle, struct cpu_id_t *i
}
else if(id->vendor == VENDOR_AMD) {
/* Refer links above
MSRC001_0061[2:0] is CurPstateLimit
CurPstateLimit is the highest-performance non-boosted P-state */
err = cpu_rdmsr_range(handle, MSR_PSTATE_L, 2, 0, &reg);
MSRC001_0061[6:4] is PstateMaxVal
PstateMaxVal is the the lowest-performance non-boosted P-state */
err = cpu_rdmsr_range(handle, MSR_PSTATE_L, 6, 4, &reg);
err += get_amd_multipliers(handle, id, internal, MSR_PSTATE_0 + (uint32_t) reg, &reg);
if (!err) return (double) clock / reg;
}