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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
Download Patch File Download Diff File Expand all files Collapse all files

14
include/sbi/sbi_hart.h
View File

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

21
lib/sbi/sbi_hart.c
View File

@@ -70,7 +70,7 @@ static void mstatus_init(struct sbi_scratch *scratch)
csr_write(CSR_MCOUNTEREN, -1); csr_write(CSR_MCOUNTEREN, -1);
/* All programmable counters will start running at runtime after S-mode request */ /* 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); csr_write(CSR_MCOUNTINHIBIT, 0xFFFFFFF8);
/** /**
@@ -402,9 +402,6 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
return NULL; return NULL;
switch (feature) { switch (feature) {
case SBI_HART_HAS_MCOUNTINHIBIT:
fstr = "mcountinhibit";
break;
case SBI_HART_HAS_SSCOFPMF: case SBI_HART_HAS_SSCOFPMF:
fstr = "sscofpmf"; fstr = "sscofpmf";
break; break;
@@ -613,26 +610,22 @@ __mhpm_skip:
if (!trap.cause) if (!trap.cause)
hfeatures->priv_version = SBI_HART_PRIV_VER_1_10; 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); val = csr_read_allowed(CSR_MCOUNTINHIBIT, (unsigned long)&trap);
if (!trap.cause) { if (!trap.cause &&
csr_write_allowed(CSR_MCOUNTINHIBIT, (unsigned long)&trap, val); (hfeatures->priv_version >= SBI_HART_PRIV_VER_1_10))
if (!trap.cause) {
hfeatures->priv_version = SBI_HART_PRIV_VER_1_11; hfeatures->priv_version = SBI_HART_PRIV_VER_1_11;
hfeatures->features |= SBI_HART_HAS_MCOUNTINHIBIT;
}
}
/* Detect if hart has menvcfg CSR */ /* Detect if hart has menvcfg CSR */
csr_read_allowed(CSR_MENVCFG, (unsigned long)&trap); 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->priv_version = SBI_HART_PRIV_VER_1_12;
hfeatures->features |= SBI_HART_HAS_MENVCFG; hfeatures->features |= SBI_HART_HAS_MENVCFG;
} }
/* Counter overflow/filtering is not useful without mcounter/inhibit */ /* Counter overflow/filtering is not useful without mcounter/inhibit */
if (hfeatures->features & SBI_HART_HAS_MCOUNTINHIBIT && if (hfeatures->priv_version >= SBI_HART_PRIV_VER_1_12) {
hfeatures->priv_version >= SBI_HART_PRIV_VER_1_12) {
/* Detect if hart supports sscofpmf */ /* Detect if hart supports sscofpmf */
csr_read_allowed(CSR_SCOUNTOVF, (unsigned long)&trap); csr_read_allowed(CSR_SCOUNTOVF, (unsigned long)&trap);
if (!trap.cause) 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) if (cidx > num_hw_ctrs || cidx == 1)
return SBI_EINVAL; 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; 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(); struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
unsigned long mctr_inhbt; 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; return 0;
mctr_inhbt = csr_read(CSR_MCOUNTINHIBIT); 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)) !sbi_hart_has_feature(scratch, SBI_HART_HAS_SSCOFPMF))
return fixed_ctr; 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); mctr_inhbt = csr_read(CSR_MCOUNTINHIBIT);
for (i = 0; i < num_hw_events; i++) { for (i = 0; i < num_hw_events; i++) {
temp = &hw_event_map[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) if (active_events[hartid][cbase] != SBI_PMU_EVENT_IDX_INVALID)
continue; continue;
/* If mcountinhibit is supported, the bit must be enabled */ /* 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)) !__test_bit(cbase, &mctr_inhbt))
continue; continue;
/* We found a valid counter that is not started yet */ /* 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(); 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); csr_write(CSR_MCOUNTINHIBIT, 0xFFFFFFF8);
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10) if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10)