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dm: acpi: support CPPC V2 capability in _OSC of DSDT for ACRN guest. #8694

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Aug 15, 2024
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dm: acpi: support CPPC V2 capability in _OSC of DSDT for ACRN guest. #8694

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1 change: 1 addition & 0 deletions devicemodel/hw/platform/acpi/acpi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -883,6 +883,7 @@ basl_fwrite_dsdt(FILE *fp, struct vmctx *ctx)

acpi_dev_write_dsdt(ctx);

osc_write_ospm_dsdt(ctx, basl_ncpu);
pm_write_dsdt(ctx, basl_ncpu);

dsdt_line("}");
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59 changes: 59 additions & 0 deletions devicemodel/hw/platform/acpi/acpi_pm.c
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Expand Up @@ -430,3 +430,62 @@ void pm_write_dsdt(struct vmctx *ctx, int ncpu)
dsdt_line(" }");
}
}

/* _OSC: Operating System Capabilities
* Currently only support CPPC v2 capability.
* CPPC v2 capability: revision 2 of the _CPC object.
* If all vcpus don't support _CPC object, no need to add _OSC in DSDT.
*/
void osc_write_ospm_dsdt(struct vmctx *ctx, int ncpu)
{
int ret;
bool support_cpc = false;
uint8_t px_cnt;

/* check px_cnt on vBSP */
ret = get_vcpu_px_cnt(ctx, 0, &px_cnt);
if (ret == 0 && px_cnt == 0) {
/* px_cnt = 0 Indicates vcpu supports continuous pstate.
*/
support_cpc = true;
}
if (support_cpc) {
/* Scope (_SB._OSC) */
dsdt_line("");
dsdt_line(" Scope (_SB)");
dsdt_line(" {");
dsdt_line(" Method (_OSC, 4, NotSerialized) // _OSC: Operating System Capabilities");
dsdt_line(" {");
dsdt_line(" CreateDWordField (Arg3, 0x00, STS0)");
dsdt_line(" CreateDWordField (Arg3, 0x04, CAP0)");
dsdt_line(" If ((Arg0 == ToUUID (\"0811b06e-4a27-44f9-8d60-3cbbc22e7b48\") /* Platform-wide OSPM Capabilities */))");
dsdt_line(" {");
dsdt_line(" If ((Arg1 == One))");
dsdt_line(" {");
dsdt_line(" If ((CAP0 & 0x40))");
dsdt_line(" {");
dsdt_line(" CAP0 &= 0x00000040");
dsdt_line(" }");
dsdt_line(" Else");
dsdt_line(" {");
dsdt_line(" STS0 &= 0xFFFFFF00");
dsdt_line(" STS0 |= 0x02");
dsdt_line(" }");
dsdt_line(" }");
dsdt_line(" Else");
dsdt_line(" {");
dsdt_line(" STS0 &= 0xFFFFFF00");
dsdt_line(" STS0 |= 0x0A");
dsdt_line(" }");
dsdt_line(" }");
dsdt_line(" Else");
dsdt_line(" {");
dsdt_line(" STS0 &= 0xFFFFFF00");
dsdt_line(" STS0 |= 0x06");
dsdt_line(" }");
dsdt_line(" Return (Arg3)");
dsdt_line(" }");
dsdt_line(" }");
dsdt_line("");
}
}
2 changes: 2 additions & 0 deletions devicemodel/include/acpi.h
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Expand Up @@ -127,4 +127,6 @@ int acrn_parse_iasl(char *arg);
int get_iasl_compiler(void);
int check_iasl_version(void);

void osc_write_ospm_dsdt(struct vmctx *ctx, int ncpu);

#endif /* _ACPI_H_ */