linux-kernel - [PATCH 5.14 116/432] platform/x86: ISST: Fix optimization with use of numa

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Message-Id: <20210916155814.698293182@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 17:57:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 116/432] platform/x86: ISST: Fix optimization with use of numa

From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

[ Upstream commit d36d4a1d75d2a8bd14ec00d5cb0ce166f6886146 ]

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: aa2ddd242572 ("platform/x86: ISST: Use numa node id for cpu pci dev mapping")
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Link: https://lore.kernel.org/r/20210727165052.427238-1-srinivas.pandruvada@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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);
 
 	isst_restore_msr_local(cpu);
 
-- 
2.30.2