[PATCH v4 03/15] mshyperv: Introduce numa_node_to_proximity_domain_info

[Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx>]

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

Change hv_proximity_domain_info to a struct to simplify the code.

Signed-off-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Wei Liu <wei.liu@xxxxxxxxxx>
---
 arch/x86/hyperv/hv_proc.c         |  8 ++------
 drivers/acpi/numa/srat.c          |  1 +
 include/asm-generic/hyperv-tlfs.h | 14 +++++---------
 include/asm-generic/mshyperv.h    | 15 +++++++++++++++
 4 files changed, 23 insertions(+), 15 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/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index f63b3704d89e..a6dffb346bf2 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -512,13 +512,9 @@ struct hv_proximity_domain_flags {
 	u32 proximity_info_valid : 1;
 } __packed;
 
-/* Not a union in windows but useful for zeroing */
-union hv_proximity_domain_info {
-	struct {
-		u32 domain_id;
-		struct hv_proximity_domain_flags flags;
-	};
-	u64 as_uint64;
+struct hv_proximity_domain_info {
+	u32 domain_id;
+	struct hv_proximity_domain_flags flags;
 } __packed;
 
 struct hv_lp_startup_status {
@@ -535,7 +531,7 @@ struct hv_lp_startup_status {
 struct hv_add_logical_processor_in {
 	u32 lp_index;
 	u32 apic_id;
-	union hv_proximity_domain_info proximity_domain_info;
+	struct hv_proximity_domain_info proximity_domain_info;
 	u64 flags;
 } __packed;
 
@@ -560,7 +556,7 @@ struct hv_create_vp {
 	u8 padding[3];
 	u8 subnode_type;
 	u64 subnode_id;
-	union hv_proximity_domain_info proximity_domain_info;
+	struct hv_proximity_domain_info proximity_domain_info;
 	u64 flags;
 } __packed;
 
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 9f2c06c9d5d1..8cc7b0e316d7 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 +29,20 @@
 
 #define VTPM_BASE_ADDRESS 0xfed40000
 
+static inline struct hv_proximity_domain_info
+numa_node_to_proximity_domain_info(int node)
+{
+	struct 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.proximity_info_valid = 1;
+		proximity_domain_info.flags.proximity_preferred = 1;
+	}
+
+	return proximity_domain_info;
+}
+
 struct ms_hyperv_info {
 	u32 features;
 	u32 priv_high;
-- 
2.25.1