PMSFCR_EL1, Sampling Filter Control Register

The PMSFCR_EL1 characteristics are:

Purpose

Controls sample filtering. The filter is the logical AND of the FL, FT and FE bits. For example, if FE == 1 and FT == 1 only samples including the selected operation types and the selected events will be recorded

Configuration

This register is present only when FEAT_SPE is implemented. Otherwise, direct accesses to PMSFCR_EL1 are UNDEFINED.

Attributes

PMSFCR_EL1 is a 64-bit register.

Field descriptions

6362616059585756555453525150494847464544434241403938373635343332
313029282726252423222120191817161514131211109876543210
RES0
RES0STLDBRES0FnEFLFTFE

Bits [63:19]

Reserved, RES0.

ST, bit [18]

Store filter enable

STMeaning
0b0

Do not record store operations

0b1

Record all store operations, including vector stores and all atomic operations

This bit is ignored by the PE when PMSFCR_EL1.FT == 0.

The reset behaviour of this field is:

LD, bit [17]

Load filter enable

LDMeaning
0b0

Do not record load operations

0b1

Record all load operations, including vector loads and atomic operations that return data

This bit is ignored by the PE when PMSFCR_EL1.FT == 0.

The reset behaviour of this field is:

B, bit [16]

Branch filter enable

BMeaning
0b0

Do not record branch and exception return operations

0b1

Record all branch and exception return operations

This bit is ignored by the PE when PMSFCR_EL1.FT == 0.

The reset behaviour of this field is:

Bits [15:4]

Reserved, RES0.

FnE, bit [3]
When FEAT_SPEv1p2 is implemented:

Filter by event, inverted.

FnEMeaning
0b0

Inverted event filtering disabled.

0b1

Inverted event filtering enabled. Samples including the events selected by PMSNEVFR_EL1 will not be recorded.

If any of the following are true, it is CONSTRAINED UNPREDICTABLE whether no samples are recorded or the PE behaves as if PMSFCR_EL1.FnE == 0:

The reset behaviour of this field is:


Otherwise:

Reserved, RES0.

FL, bit [2]

Filter by latency

FLMeaning
0b0

Latency filtering disabled

0b1

Latency filtering enabled. Samples with a total latency less than PMSLATFR_EL1.MINLAT will not be recorded

If this field is set to 1 and PMSLATFR_EL1.MINLAT is set to zero, it is CONSTRAINED UNPREDICTABLE whether no samples are recorded or the PE behaves as if PMSFCR_EL1.FL is set to 0

The reset behaviour of this field is:

FT, bit [1]

Filter by operation type. The filter is the logical OR of the ST, LD and B bits. For example, if LD and ST are both set, both load and store operations are recorded

FTMeaning
0b0

Type filtering disabled

0b1

Type filtering enabled. Samples not one of the selected operation types will not be recorded

If this field is set to 1 and the PMSFCR_EL1.{ST, LD, B} bits are all set to zero, it is CONSTRAINED UNPREDICTABLE whether no samples are recorded or the PE behaves as if PMSFCR_EL1.FT is set to 0

The reset behaviour of this field is:

FE, bit [0]

Filter by event.

FEMeaning
0b0

Event filtering disabled.

0b1

Event filtering enabled. Samples not including the events selected by PMSEVFR_EL1 will not be recorded.

If any of the following are true, it is CONSTRAINED UNPREDICTABLE whether no samples are recorded or the PE behaves as if PMSFCR_EL1.FE == 0:

The reset behaviour of this field is:

Accessing PMSFCR_EL1

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, PMSFCR_EL1

op0op1CRnCRmop2
0b110b0000b10010b10010b100

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif EL2Enabled() && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.PMSFCR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.TPMS == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else return PMSFCR_EL1; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else return PMSFCR_EL1; elsif PSTATE.EL == EL3 then return PMSFCR_EL1;

MSR PMSFCR_EL1, <Xt>

op0op1CRnCRmop2
0b110b0000b10010b10010b100

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif EL2Enabled() && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.PMSFCR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.TPMS == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else PMSFCR_EL1 = X[t]; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else PMSFCR_EL1 = X[t]; elsif PSTATE.EL == EL3 then PMSFCR_EL1 = X[t];


30/06/2021 15:22; 2a17f7750cfd1ab239f20f6cf29877ba8041794f

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