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From: Srinivas Pandruvada <>
	Srinivas Pandruvada <>
Subject: [PATCH] platform/x86: ISST: Fix optimization with use of numa
Date: Tue, 27 Jul 2021 09:44:54 -0700	[thread overview]
Message-ID: <> (raw)

When numa is used to map CPU to PCI device, the optimized path to read
from cached data is not working and still calls _isst_if_get_pci_dev().

The reason is that when caching the mapping, numa information is not
available as it is read later. So move the assignment of
isst_cpu_info[cpu].numa_node before calling _isst_if_get_pci_dev().

Fixes: 96891f347865 ("ISST: Fix optimization with use of numa")
Signed-off-by: Srinivas Pandruvada <>
This patch can wait for next merge window as these systems are not

 drivers/platform/x86/intel_speed_select_if/isst_if_common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel_speed_select_if/isst_if_common.c b/drivers/platform/x86/intel_speed_select_if/isst_if_common.c
index 6f0cc679c8e5..8a4d52a9028d 100644
--- a/drivers/platform/x86/intel_speed_select_if/isst_if_common.c
+++ b/drivers/platform/x86/intel_speed_select_if/isst_if_common.c
@@ -379,6 +379,8 @@ static int isst_if_cpu_online(unsigned int cpu)
 	u64 data;
 	int ret;
+	isst_cpu_info[cpu].numa_node = cpu_to_node(cpu);
 	ret = rdmsrl_safe(MSR_CPU_BUS_NUMBER, &data);
 	if (ret) {
 		/* This is not a fatal error on MSR mailbox only I/F */
@@ -397,7 +399,6 @@ static int isst_if_cpu_online(unsigned int cpu)
 		return ret;
 	isst_cpu_info[cpu].punit_cpu_id = data;
-	isst_cpu_info[cpu].numa_node = cpu_to_node(cpu);

                 reply	other threads:[~2021-07-27 16:45 UTC|newest]

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