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lib: sbi: Remove MCOUNTINHIBT hart feature

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If a hart implements privileged spec v1.11 (or higher) then we can
safely assume that mcountinhibit CSR is present and we don't need
MCOUNTINHIBT as a hart feature.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel 2022-04-28 18:59:14 +05:30 committed by Anup Patel
parent d4b563c881
commit dbc3d8f0ef
3 changed files with 19 additions and 28 deletions
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14
include/sbi/sbi_hart.h
View File

@ -26,20 +26,18 @@ enum sbi_hart_priv_versions {
/** Possible feature flags of a hart */
enum sbi_hart_features {
/** Hart has counter inhibit CSR */
SBI_HART_HAS_MCOUNTINHIBIT = (1 << 0),
/** Hart has sscofpmf extension */
SBI_HART_HAS_SSCOFPMF = (1 << 1),
SBI_HART_HAS_SSCOFPMF = (1 << 0),
/** HART has timer csr implementation in hardware */
SBI_HART_HAS_TIME = (1 << 2),
SBI_HART_HAS_TIME = (1 << 1),
/** HART has AIA local interrupt CSRs */
SBI_HART_HAS_AIA = (1 << 3),
SBI_HART_HAS_AIA = (1 << 2),
/** HART has menvcfg CSR */
SBI_HART_HAS_MENVCFG = (1 << 4),
SBI_HART_HAS_MENVCFG = (1 << 3),
/** HART has mstateen CSR **/
SBI_HART_HAS_SMSTATEEN = (1 << 5),
SBI_HART_HAS_SMSTATEEN = (1 << 4),
/** HART has SSTC extension implemented in hardware */
SBI_HART_HAS_SSTC = (1 << 6),
SBI_HART_HAS_SSTC = (1 << 5),
/** Last index of Hart features*/
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_SSTC,

23
lib/sbi/sbi_hart.c
View File

@ -70,7 +70,7 @@ static void mstatus_init(struct sbi_scratch *scratch)
csr_write(CSR_MCOUNTEREN, -1);
/* All programmable counters will start running at runtime after S-mode request */
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT))
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_11)
csr_write(CSR_MCOUNTINHIBIT, 0xFFFFFFF8);
/**
@ -402,9 +402,6 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
return NULL;
switch (feature) {
case SBI_HART_HAS_MCOUNTINHIBIT:
fstr = "mcountinhibit";
break;
case SBI_HART_HAS_SSCOFPMF:
fstr = "sscofpmf";
break;
@ -613,26 +610,22 @@ __mhpm_skip:
if (!trap.cause)
hfeatures->priv_version = SBI_HART_PRIV_VER_1_10;
/* Detect if hart supports MCOUNTINHIBIT feature */
/* Detect if hart supports Priv v1.11 */
val = csr_read_allowed(CSR_MCOUNTINHIBIT, (unsigned long)&trap);
if (!trap.cause) {
csr_write_allowed(CSR_MCOUNTINHIBIT, (unsigned long)&trap, val);
if (!trap.cause) {
hfeatures->priv_version = SBI_HART_PRIV_VER_1_11;
hfeatures->features |= SBI_HART_HAS_MCOUNTINHIBIT;
}
}
if (!trap.cause &&
(hfeatures->priv_version >= SBI_HART_PRIV_VER_1_10))
hfeatures->priv_version = SBI_HART_PRIV_VER_1_11;
/* Detect if hart has menvcfg CSR */
csr_read_allowed(CSR_MENVCFG, (unsigned long)&trap);
if (!trap.cause) {
if (!trap.cause &&
(hfeatures->priv_version >= SBI_HART_PRIV_VER_1_11)) {
hfeatures->priv_version = SBI_HART_PRIV_VER_1_12;
hfeatures->features |= SBI_HART_HAS_MENVCFG;
}
/* Counter overflow/filtering is not useful without mcounter/inhibit */
if (hfeatures->features & SBI_HART_HAS_MCOUNTINHIBIT &&
hfeatures->priv_version >= SBI_HART_PRIV_VER_1_12) {
if (hfeatures->priv_version >= SBI_HART_PRIV_VER_1_12) {
/* Detect if hart supports sscofpmf */
csr_read_allowed(CSR_SCOUNTOVF, (unsigned long)&trap);
if (!trap.cause)

10
lib/sbi/sbi_pmu.c
View File

@ -300,7 +300,7 @@ static int pmu_ctr_start_hw(uint32_t cidx, uint64_t ival, bool ival_update)
if (cidx > num_hw_ctrs || cidx == 1)
return SBI_EINVAL;
if (!sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT))
if (sbi_hart_priv_version(scratch) < SBI_HART_PRIV_VER_1_11)
goto skip_inhibit_update;
/*
@ -372,7 +372,7 @@ static int pmu_ctr_stop_hw(uint32_t cidx)
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
unsigned long mctr_inhbt;
if (!sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT))
if (sbi_hart_priv_version(scratch) < SBI_HART_PRIV_VER_1_11)
return 0;
mctr_inhbt = csr_read(CSR_MCOUNTINHIBIT);
@ -528,7 +528,7 @@ static int pmu_ctr_find_hw(unsigned long cbase, unsigned long cmask, unsigned lo
!sbi_hart_has_feature(scratch, SBI_HART_HAS_SSCOFPMF))
return fixed_ctr;
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT))
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_11)
mctr_inhbt = csr_read(CSR_MCOUNTINHIBIT);
for (i = 0; i < num_hw_events; i++) {
temp = &hw_event_map[i];
@ -555,7 +555,7 @@ static int pmu_ctr_find_hw(unsigned long cbase, unsigned long cmask, unsigned lo
if (active_events[hartid][cbase] != SBI_PMU_EVENT_IDX_INVALID)
continue;
/* If mcountinhibit is supported, the bit must be enabled */
if ((sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT)) &&
if ((sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_11) &&
!__test_bit(cbase, &mctr_inhbt))
continue;
/* We found a valid counter that is not started yet */
@ -730,7 +730,7 @@ void sbi_pmu_exit(struct sbi_scratch *scratch)
{
u32 hartid = current_hartid();
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT))
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_11)
csr_write(CSR_MCOUNTINHIBIT, 0xFFFFFFF8);
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10)