Patch "powercap: intel_rapl_tpmi: Fix System Domain probing" has been added to the 6.6-stable tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This is a note to let you know that I've just added the patch titled

    powercap: intel_rapl_tpmi: Fix System Domain probing

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powercap-intel_rapl_tpmi-fix-system-domain-probing.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a81f201c4136e7372e4620e1d44cd565ea3f9aef
Author: Zhang Rui <rui.zhang@xxxxxxxxx>
Date:   Wed Jan 31 19:37:11 2024 +0800

    powercap: intel_rapl_tpmi: Fix System Domain probing
    
    [ Upstream commit 903eb9fb85e32810f376a2858aad77c9298f9488 ]
    
    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: 9eef7f9da928 ("powercap: intel_rapl: Introduce RAPL TPMI interface driver")
    Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
    Cc: 6.5+ <stable@xxxxxxxxxxxxxxx> # 6.5+
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/powercap/intel_rapl_tpmi.c b/drivers/powercap/intel_rapl_tpmi.c
index f1c734ac3c349..f6b7f085977ce 100644
--- a/drivers/powercap/intel_rapl_tpmi.c
+++ b/drivers/powercap/intel_rapl_tpmi.c
@@ -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:




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux