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lib: sbi: Remove MCOUNTEREN and SCOUNTEREN hart features

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If a hart implements privileged spec v1.10 (or higher) then we can
safely assume that [m|s]counteren CSR are present and we don't need
MCOUNTEREN and SCOUNTEREN as hart features.

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 18:31:57 +05:30 • committed by Anup Patel
parent 5b8b377178
commit d4b563c881
4 changed files with 16 additions and 38 deletions
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18
include/sbi/sbi_hart.h
View file

@ -26,24 +26,20 @@ enum sbi_hart_priv_versions {
/** Possible feature flags of a hart */
enum sbi_hart_features {
/** Hart has S-mode counter enable */
SBI_HART_HAS_SCOUNTEREN = (1 << 0),
/** Hart has M-mode counter enable */
SBI_HART_HAS_MCOUNTEREN = (1 << 1),
/** Hart has counter inhibit CSR */
SBI_HART_HAS_MCOUNTINHIBIT = (1 << 2),
SBI_HART_HAS_MCOUNTINHIBIT = (1 << 0),
/** Hart has sscofpmf extension */
SBI_HART_HAS_SSCOFPMF = (1 << 3),
SBI_HART_HAS_SSCOFPMF = (1 << 1),
/** HART has timer csr implementation in hardware */
SBI_HART_HAS_TIME = (1 << 4),
SBI_HART_HAS_TIME = (1 << 2),
/** HART has AIA local interrupt CSRs */
SBI_HART_HAS_AIA = (1 << 5),
SBI_HART_HAS_AIA = (1 << 3),
/** HART has menvcfg CSR */
SBI_HART_HAS_MENVCFG = (1 << 6),
SBI_HART_HAS_MENVCFG = (1 << 4),
/** HART has mstateen CSR **/
SBI_HART_HAS_SMSTATEEN = (1 << 7),
SBI_HART_HAS_SMSTATEEN = (1 << 5),
/** HART has SSTC extension implemented in hardware */
SBI_HART_HAS_SSTC = (1 << 8),
SBI_HART_HAS_SSTC = (1 << 6),
/** Last index of Hart features*/
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_SSTC,

4
lib/sbi/sbi_emulate_csr.c
View file

@ -24,7 +24,7 @@ static bool hpm_allowed(int hpm_num, ulong prev_mode, bool virt)
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
if (prev_mode <= PRV_S) {
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTEREN)) {
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10) {
cen &= csr_read(CSR_MCOUNTEREN);
if (virt)
cen &= csr_read(CSR_HCOUNTEREN);
@ -33,7 +33,7 @@ static bool hpm_allowed(int hpm_num, ulong prev_mode, bool virt)
}
}
if (prev_mode == PRV_U) {
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_SCOUNTEREN))
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10)
cen &= csr_read(CSR_SCOUNTEREN);
else
cen = 0;

29
lib/sbi/sbi_hart.c
View file

@ -58,7 +58,7 @@ static void mstatus_init(struct sbi_scratch *scratch)
/* Disable user mode usage of all perf counters except default ones (CY, TM, IR) */
if (misa_extension('S') &&
sbi_hart_has_feature(scratch, SBI_HART_HAS_SCOUNTEREN))
sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10)
csr_write(CSR_SCOUNTEREN, 7);
/**
@ -66,7 +66,7 @@ static void mstatus_init(struct sbi_scratch *scratch)
* Supervisor mode usage for all counters are enabled by default
* But counters will not run until mcountinhibit is set.
*/
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTEREN))
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10)
csr_write(CSR_MCOUNTEREN, -1);
/* All programmable counters will start running at runtime after S-mode request */
@ -402,12 +402,6 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
return NULL;
switch (feature) {
case SBI_HART_HAS_SCOUNTEREN:
fstr = "scounteren";
break;
case SBI_HART_HAS_MCOUNTEREN:
fstr = "mcounteren";
break;
case SBI_HART_HAS_MCOUNTINHIBIT:
fstr = "mcountinhibit";
break;
@ -614,23 +608,10 @@ __mhpm_skip:
#undef __check_csr_2
#undef __check_csr
/* Detect if hart supports SCOUNTEREN feature */
val = csr_read_allowed(CSR_SCOUNTEREN, (unsigned long)&trap);
if (!trap.cause) {
hfeatures->priv_version = SBI_HART_PRIV_VER_1_10;
csr_write_allowed(CSR_SCOUNTEREN, (unsigned long)&trap, val);
if (!trap.cause)
hfeatures->features |= SBI_HART_HAS_SCOUNTEREN;
}
/* Detect if hart supports MCOUNTEREN feature */
/* Detect if hart supports Priv v1.10 */
val = csr_read_allowed(CSR_MCOUNTEREN, (unsigned long)&trap);
if (!trap.cause) {
if (!trap.cause)
hfeatures->priv_version = SBI_HART_PRIV_VER_1_10;
csr_write_allowed(CSR_MCOUNTEREN, (unsigned long)&trap, val);
if (!trap.cause)
hfeatures->features |= SBI_HART_HAS_MCOUNTEREN;
}
/* Detect if hart supports MCOUNTINHIBIT feature */
val = csr_read_allowed(CSR_MCOUNTINHIBIT, (unsigned long)&trap);
@ -651,7 +632,7 @@ __mhpm_skip:
/* Counter overflow/filtering is not useful without mcounter/inhibit */
if (hfeatures->features & SBI_HART_HAS_MCOUNTINHIBIT &&
hfeatures->features & SBI_HART_HAS_MCOUNTEREN) {
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)

3
lib/sbi/sbi_pmu.c
View file

@ -733,7 +733,8 @@ void sbi_pmu_exit(struct sbi_scratch *scratch)
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT))
csr_write(CSR_MCOUNTINHIBIT, 0xFFFFFFF8);
csr_write(CSR_MCOUNTEREN, -1);
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10)
csr_write(CSR_MCOUNTEREN, -1);
pmu_reset_event_map(hartid);
}