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powercap: intel_rapl_tpmi: Fix System Domain probing

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Only domain root packages can enumerate System (Psys) domain.
Whether a package is domain root or not is described in the Bit 0 of the
Domain Info register.

Add support for Domain Info register and fix the System domain probing
accordingly.

Fixes: 9eef7f9da9 ("powercap: intel_rapl: Introduce RAPL TPMI interface driver")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Cc: 6.5+ <stable@vger.kernel.org> # 6.5+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zhang Rui 2024-01-31 19:37:11 +08:00 committed by Rafael J. Wysocki
parent faa9130ce7
commit 903eb9fb85
1 changed files with 14 additions and 0 deletions
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14
drivers/powercap/intel_rapl_tpmi.c
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@ -131,6 +131,12 @@ static void trp_release(struct tpmi_rapl_package *trp)
mutex_unlock(&tpmi_rapl_lock);
}
/*
* Bit 0 of TPMI_RAPL_REG_DOMAIN_INFO indicates if the current package is a domain
* root or not. Only domain root packages can enumerate System (Psys) Domain.
*/
#define TPMI_RAPL_DOMAIN_ROOT BIT(0)
static int parse_one_domain(struct tpmi_rapl_package *trp, u32 offset)
{
u8 tpmi_domain_version;
@ -140,6 +146,7 @@ static int parse_one_domain(struct tpmi_rapl_package *trp, u32 offset)
enum rapl_domain_reg_id reg_id;
int tpmi_domain_size, tpmi_domain_flags;
u64 tpmi_domain_header = readq(trp->base + offset);
u64 tpmi_domain_info;
/* Domain Parent bits are ignored for now */
tpmi_domain_version = tpmi_domain_header & 0xff;
@ -170,6 +177,13 @@ static int parse_one_domain(struct tpmi_rapl_package *trp, u32 offset)
domain_type = RAPL_DOMAIN_PACKAGE;
break;
case TPMI_RAPL_DOMAIN_SYSTEM:
if (!(tpmi_domain_flags & BIT(TPMI_RAPL_REG_DOMAIN_INFO))) {
pr_warn(FW_BUG "System domain must support Domain Info register\n");
return -ENODEV;
}
tpmi_domain_info = readq(trp->base + offset + TPMI_RAPL_REG_DOMAIN_INFO);
if (!(tpmi_domain_info & TPMI_RAPL_DOMAIN_ROOT))
return 0;
domain_type = RAPL_DOMAIN_PLATFORM;
break;
case TPMI_RAPL_DOMAIN_MEMORY: