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From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
To: <linux-mm@kvack.org>, <linux-acpi@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
Cc: Keith Busch <keith.busch@intel.com>, <jglisse@redhat.com>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>, <linuxarm@huawei.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH 3/4] x86: Support Generic Initiator only proximity domains
Date: Wed, 21 Aug 2019 22:52:41 +0800
Message-ID: <20190821145242.2330-4-Jonathan.Cameron@huawei.com> (raw)
In-Reply-To: <20190821145242.2330-1-Jonathan.Cameron@huawei.com>

Done in a somewhat different fashion to arm64.
Here the infrastructure for memoryless domains was already
in place.  That infrastruture applies just as well to
domains that also don't have a CPU, hence it works for
Generic Initiator Domains.

In common with memoryless domains we only register GI domains
if the proximity node is not online. If a domain is already
a memory containing domain, or a memoryless domain there is
nothing to do just because it also contains a Generic Initiator.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 arch/x86/include/asm/numa.h |  2 ++
 arch/x86/kernel/setup.c     |  1 +
 arch/x86/mm/numa.c          | 14 ++++++++++++++
 3 files changed, 17 insertions(+)

diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index bbfde3d2662f..f631467272a3 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -62,12 +62,14 @@ extern void numa_clear_node(int cpu);
 extern void __init init_cpu_to_node(void);
 extern void numa_add_cpu(int cpu);
 extern void numa_remove_cpu(int cpu);
+extern void init_gi_nodes(void);
 #else	/* CONFIG_NUMA */
 static inline void numa_set_node(int cpu, int node)	{ }
 static inline void numa_clear_node(int cpu)		{ }
 static inline void init_cpu_to_node(void)		{ }
 static inline void numa_add_cpu(int cpu)		{ }
 static inline void numa_remove_cpu(int cpu)		{ }
+static inline void init_gi_nodes(void)			{ }
 #endif	/* CONFIG_NUMA */
 
 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index bbe35bf879f5..8c368279624d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1265,6 +1265,7 @@ void __init setup_arch(char **cmdline_p)
 	prefill_possible_map();
 
 	init_cpu_to_node();
+	init_gi_nodes();
 
 	io_apic_init_mappings();
 
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index e6dad600614c..2f561344d590 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -733,6 +733,20 @@ static void __init init_memory_less_node(int nid)
 	 */
 }
 
+/*
+ * Generic Initiator Nodes may have neither CPU nor Memory.
+ * At this stage if either of the others were present we would
+ * already be online.
+ */
+void __init init_gi_nodes(void)
+{
+	int nid;
+
+	for_each_node_state(nid, N_GENERIC_INITIATOR)
+		if (!node_online(nid))
+			init_memory_less_node(nid);
+}
+
 /*
  * Setup early cpu_to_node.
  *
-- 
2.20.1


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-21 14:52 [PATCH 0/4 V4] ACPI: Support generic initiator " Jonathan Cameron
2019-08-21 14:52 ` [PATCH 1/4] ACPI: Support Generic Initiator only domains Jonathan Cameron
2019-09-02 21:26   ` Rafael J. Wysocki
2019-09-05  9:16     ` Jonathan Cameron
2019-08-21 14:52 ` [PATCH 2/4] arm64: " Jonathan Cameron
2019-08-21 14:52 ` Jonathan Cameron [this message]
2019-08-21 14:52 ` [PATCH 4/4] ACPI: Let ACPI know we support Generic Initiator Affinity Structures Jonathan Cameron

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