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lib: sbi: Fix hw a/d updating defaults

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The Svade dt-binding description states that Svadu should only
be enabled at boot time when only Svadu is present in the DT.
Ensure that's the case. Also, when only Svadu is supported,
disable FWFT.PTE_AD_HW_UPDATING, as we need both to support
toggling.

Signed-off-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Reviewed-by: Radim Krčmář <radim.krcmar@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260401220845.190680-1-andrew.jones@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones
2026-04-01 17:08:45 -05:00
committed by Anup Patel
parent 8536a351fd
commit 5f13f9e13f
2 changed files with 19 additions and 9 deletions
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lib/sbi/sbi_hart.c
+10 -8
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@@ -137,6 +137,9 @@ static void mstatus_init(struct sbi_scratch *scratch)
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_12) {
menvcfg_val = csr_read64(CSR_MENVCFG);
/* Disable HW A/D updating by default */
menvcfg_val &= ~ENVCFG_ADUE;
/* Disable double trap by default */
menvcfg_val &= ~ENVCFG_DTE;
@@ -158,18 +161,17 @@ static void mstatus_init(struct sbi_scratch *scratch)
#endif
__set_menvcfg_ext(SBI_HART_EXT_SSTC, ENVCFG_STCE)
__set_menvcfg_ext(SBI_HART_EXT_SMCDELEG, ENVCFG_CDE);
__set_menvcfg_ext(SBI_HART_EXT_SVADU, ENVCFG_ADUE);
#undef __set_menvcfg_ext
/*
* When both Svade and Svadu are present in DT, the default scheme for managing
* the PTE A/D bits should use Svade. Check Svadu before Svade extension to ensure
* that the ADUE bit is cleared when the Svade support are specified.
* Assume only Svadu is supported when it is the only extension
* present in the ISA string. Svade is assumed when neither are
* present. When both are present we must default to Svade (see
* the zero reset value of FWFT.PTE_AD_HW_UPDATING).
*/
if (!sbi_hart_has_extension(scratch, SBI_HART_EXT_SVADE))
__set_menvcfg_ext(SBI_HART_EXT_SVADU, ENVCFG_ADUE);
if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SVADE))
menvcfg_val &= ~ENVCFG_ADUE;
#undef __set_menvcfg_ext
csr_write64(CSR_MENVCFG, menvcfg_val);