linux-kernel - [PATCH v2 03/15] mshyperv: Introduce numa_node_to_proximity_domain

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Message-Id: <1692309711-5573-4-git-send-email-nunodasneves@linux.microsoft.com>
Date:   Thu, 17 Aug 2023 15:01:39 -0700
From:   Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To:     linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arch@...r.kernel.org
Cc:     patches@...ts.linux.dev, mikelley@...rosoft.com, kys@...rosoft.com,
        wei.liu@...nel.org, haiyangz@...rosoft.com, decui@...rosoft.com,
        apais@...ux.microsoft.com, Tianyu.Lan@...rosoft.com,
        ssengar@...ux.microsoft.com, mukeshrathor@...rosoft.com,
        stanislav.kinsburskiy@...il.com, jinankjain@...ux.microsoft.com,
        vkuznets@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        will@...nel.org, catalin.marinas@....com
Subject: [PATCH v2 03/15] mshyperv: Introduce numa_node_to_proximity_domain_info

Factor out logic for converting numa node to proximity domain info into
a helper function, and export it.

Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Reviewed-by: Wei Liu <wei.liu@...nel.org>
---
 arch/x86/hyperv/hv_proc.c      |  8 ++------
 drivers/acpi/numa/srat.c       |  1 +
 include/asm-generic/mshyperv.h | 18 ++++++++++++++++++
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/arch/x86/hyperv/hv_proc.c b/arch/x86/hyperv/hv_proc.c
index 68a0843d4750..5ba5ca1b2089 100644
--- a/arch/x86/hyperv/hv_proc.c
+++ b/arch/x86/hyperv/hv_proc.c
@@ -121,7 +121,6 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
 	u64 status;
 	unsigned long flags;
 	int ret = HV_STATUS_SUCCESS;
-	int pxm = node_to_pxm(node);
 
 	/*
 	 * When adding a logical processor, the hypervisor may return
@@ -137,11 +136,8 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
 
 		input->lp_index = lp_index;
 		input->apic_id = apic_id;
-		input->flags = 0;
-		input->proximity_domain_info.domain_id = pxm;
-		input->proximity_domain_info.flags.reserved = 0;
-		input->proximity_domain_info.flags.proximity_info_valid = 1;
-		input->proximity_domain_info.flags.proximity_preferred = 1;
+		input->proximity_domain_info =
+			numa_node_to_proximity_domain_info(node);
 		status = hv_do_hypercall(HVCALL_ADD_LOGICAL_PROCESSOR,
 					 input, output);
 		local_irq_restore(flags);
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
index 1f4fc5f8a819..0cf9f0574495 100644
--- a/drivers/acpi/numa/srat.c
+++ b/drivers/acpi/numa/srat.c
@@ -48,6 +48,7 @@ int node_to_pxm(int node)
 		return PXM_INVAL;
 	return node_to_pxm_map[node];
 }
+EXPORT_SYMBOL(node_to_pxm);
 
 static void __acpi_map_pxm_to_node(int pxm, int node)
 {
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 233c976344e5..447e7ebe67ee 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -21,6 +21,7 @@
 #include <linux/types.h>
 #include <linux/atomic.h>
 #include <linux/bitops.h>
+#include <acpi/acpi_numa.h>
 #include <linux/cpumask.h>
 #include <linux/nmi.h>
 #include <asm/ptrace.h>
@@ -28,6 +29,23 @@
 
 #define VTPM_BASE_ADDRESS 0xfed40000
 
+static inline union hv_proximity_domain_info
+numa_node_to_proximity_domain_info(int node)
+{
+	union hv_proximity_domain_info proximity_domain_info;
+
+	if (node != NUMA_NO_NODE) {
+		proximity_domain_info.domain_id = node_to_pxm(node);
+		proximity_domain_info.flags.reserved = 0;
+		proximity_domain_info.flags.proximity_info_valid = 1;
+		proximity_domain_info.flags.proximity_preferred = 1;
+	} else {
+		proximity_domain_info.as_uint64 = 0;
+	}
+
+	return proximity_domain_info;
+}
+
 struct ms_hyperv_info {
 	u32 features;
 	u32 priv_high;
-- 
2.25.1