Commit 6b78cb54 authored by Tejun Heo's avatar Tejun Heo
Browse files

x86-64, NUMA: Unify emulated apicid -> node mapping transformation 



NUMA emulation changes node mappings and thus apicid -> node mapping
needs to be updated accordingly.  srat_64 and amdtopology_64 did this
separately; however, all the necessary information is the mapping from
emulated nodes to physical nodes which is available in
emu_nid_to_phys[].

Implement common __apicid_to_node[] transformation in numa_emulation()
and drop duplicate implementations.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shaohui Zheng <shaohui.zheng@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@linux.intel.com>
parent 1cca5340

arch/x86/mm/amdtopology_64.c

+0 −9
Original line number Diff line number Diff line
@@ -196,10 +196,6 @@ int __init amd_numa_init(void) 
}



#ifdef CONFIG_NUMA_EMU

static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {

	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE

};



/*

 * For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be

 * setup to represent the physical topology but reflect the emulated
@@ -224,20 +220,15 @@ void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes) 
	for (i = 0; i < nr_nodes; i++) {

		int index;

		int nid;

		int j;



		nid = find_node_by_addr(nodes[i].start);

		if (nid == NUMA_NO_NODE)

			continue;



		index = nodeids[nid] << bits;

		if (fake_apicid_to_node[index + apicid_base] == NUMA_NO_NODE)

			for (j = apicid_base; j < cores + apicid_base; j++)

				fake_apicid_to_node[index + j] = i;

#ifdef CONFIG_ACPI_NUMA

		__acpi_map_pxm_to_node(nid, i);

#endif

	}

	memcpy(__apicid_to_node, fake_apicid_to_node, sizeof(__apicid_to_node));

}

#endif /* CONFIG_NUMA_EMU */

arch/x86/mm/numa_64.c

+15 −1
Original line number Diff line number Diff line
@@ -858,7 +858,7 @@ static bool __init numa_emulation(int acpi, int amd) 
	static struct numa_meminfo ei __initdata;

	static struct numa_meminfo pi __initdata;

	const u64 max_addr = max_pfn << PAGE_SHIFT;

	int i, ret;

	int i, j, ret;



	memset(&ei, 0, sizeof(ei));

	pi = numa_meminfo;
@@ -894,6 +894,20 @@ static bool __init numa_emulation(int acpi, int amd) 
	/* commit */

	numa_meminfo = ei;



	/*

	 * Transform __apicid_to_node table to use emulated nids by

	 * reverse-mapping phys_nid.  The maps should always exist but fall

	 * back to zero just in case.

	 */

	for (i = 0; i < ARRAY_SIZE(__apicid_to_node); i++) {

		if (__apicid_to_node[i] == NUMA_NO_NODE)

			continue;

		for (j = 0; j < ARRAY_SIZE(emu_nid_to_phys); j++)

			if (__apicid_to_node[i] == emu_nid_to_phys[j])

				break;

		__apicid_to_node[i] = j < ARRAY_SIZE(emu_nid_to_phys) ? j : 0;

	}



	/* make sure all emulated nodes are mapped to a physical node */

	for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++)

		if (emu_nid_to_phys[i] == NUMA_NO_NODE)

arch/x86/mm/srat_64.c

+1 −23
Original line number Diff line number Diff line
@@ -265,9 +265,6 @@ int __init x86_acpi_numa_init(void) 
static int fake_node_to_pxm_map[MAX_NUMNODES] __initdata = {

	[0 ... MAX_NUMNODES-1] = PXM_INVAL

};

static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {

	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE

};



/*

 * In NUMA emulation, we need to setup proximity domain (_PXM) to node ID
@@ -279,7 +276,7 @@ static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = { 
 */

void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)

{

	int i, j;

	int i;



	for (i = 0; i < num_nodes; i++) {

		int nid, pxm;
@@ -291,29 +288,10 @@ void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes) 
		if (pxm == PXM_INVAL)

			continue;

		fake_node_to_pxm_map[i] = pxm;

		/*

		 * For each apicid_to_node mapping that exists for this real

		 * node, it must now point to the fake node ID.

		 */

		for (j = 0; j < MAX_LOCAL_APIC; j++)

			if (__apicid_to_node[j] == nid &&

			    fake_apicid_to_node[j] == NUMA_NO_NODE)

				fake_apicid_to_node[j] = i;

	}



	/*

	 * If there are apicid-to-node mappings for physical nodes that do not

	 * have a corresponding emulated node, it should default to a guaranteed

	 * value.

	 */

	for (i = 0; i < MAX_LOCAL_APIC; i++)

		if (__apicid_to_node[i] != NUMA_NO_NODE &&

		    fake_apicid_to_node[i] == NUMA_NO_NODE)

			fake_apicid_to_node[i] = 0;



	for (i = 0; i < num_nodes; i++)

		__acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);

	memcpy(__apicid_to_node, fake_apicid_to_node, sizeof(__apicid_to_node));



	for (i = 0; i < num_nodes; i++)

		if (fake_nodes[i].start != fake_nodes[i].end)

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