Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932104AbbFSSTW (ORCPT ); Fri, 19 Jun 2015 14:19:22 -0400 Received: from g2t2352.austin.hp.com ([15.217.128.51]:59995 "EHLO g2t2352.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755151AbbFSSSy (ORCPT ); Fri, 19 Jun 2015 14:18:54 -0400 From: Toshi Kani To: rjw@rjwysocki.net, dan.j.williams@intel.com Cc: linux-acpi@vger.kernel.org, linux-nvdimm@ml01.01.org, linux-kernel@vger.kernel.org, Toshi Kani Subject: [PATCH v3 1/3] acpi: Add acpi_map_pxm_to_online_node() Date: Fri, 19 Jun 2015 12:18:32 -0600 Message-Id: <1434737914-18466-2-git-send-email-toshi.kani@hp.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1434737914-18466-1-git-send-email-toshi.kani@hp.com> References: <1434737914-18466-1-git-send-email-toshi.kani@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4055 Lines: 130 The kernel initializes CPU & memory's NUMA topology from ACPI SRAT table. Some other ACPI tables, such as NFIT and DMAR, also contain proximity IDs for their device's NUMA topology. This information can be used to improve performance of these devices. This patch introduces acpi_map_pxm_to_online_node(), which is similar to acpi_map_pxm_to_node(), but always returns an on-line node. When the mapped node from a given proximity ID is off-line, it looks up the node distance table and returns the nearest on-line node. ACPI device drivers, which are called after the NUMA initialization has completed in the kernel, can call this interface to obtain their device NUMA topology from ACPI tables. Such drivers do not have to deal with off-line nodes. A node may be off-line when a device proximity ID is unique, SRAT memory entry does not exist, or NUMA is disabled, ex. "numa=off" on x86. This patch also moves the pxm range check from acpi_get_node() to acpi_map_pxm_to_node(). Signed-off-by: Toshi Kani --- drivers/acpi/numa.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++--- include/linux/acpi.h | 5 +++++ 2 files changed, 52 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c index 1333cbdc..0b6e3a0 100644 --- a/drivers/acpi/numa.c +++ b/drivers/acpi/numa.c @@ -29,6 +29,8 @@ #include #include #include +#include +#include #define PREFIX "ACPI: " @@ -70,7 +72,12 @@ static void __acpi_map_pxm_to_node(int pxm, int node) int acpi_map_pxm_to_node(int pxm) { - int node = pxm_to_node_map[pxm]; + int node; + + if (pxm < 0 || pxm >= MAX_PXM_DOMAINS) + return NUMA_NO_NODE; + + node = pxm_to_node_map[pxm]; if (node == NUMA_NO_NODE) { if (nodes_weight(nodes_found_map) >= MAX_NUMNODES) @@ -83,6 +90,45 @@ int acpi_map_pxm_to_node(int pxm) return node; } +/** + * acpi_map_pxm_to_online_node - Map proximity ID to on-line node + * @pxm: ACPI proximity ID + * + * This is similar to acpi_map_pxm_to_node(), but always returns an on-line + * node. When the mapped node from a given proximity ID is off-line, it + * looks up the node distance table and returns the nearest on-line node. + * + * ACPI device drivers, which are called after the NUMA initialization has + * completed in the kernel, can call this interface to obtain their device + * NUMA topology from ACPI tables. Such drivers do not have to deal with + * off-line nodes. A node may be off-line when a device proximity ID is + * unique, SRAT memory entry does not exist, or NUMA is disabled, ex. + * "numa=off" on x86. + */ +int acpi_map_pxm_to_online_node(int pxm) +{ + int node, n, dist, min_dist; + + node = acpi_map_pxm_to_node(pxm); + + if (node == NUMA_NO_NODE) + node = 0; + + if (!node_online(node)) { + min_dist = INT_MAX; + for_each_online_node(n) { + dist = node_distance(node, n); + if (dist < min_dist) { + min_dist = dist; + node = n; + } + } + } + + return node; +} +EXPORT_SYMBOL(acpi_map_pxm_to_online_node); + static void __init acpi_table_print_srat_entry(struct acpi_subtable_header *header) { @@ -328,8 +374,6 @@ int acpi_get_node(acpi_handle handle) int pxm; pxm = acpi_get_pxm(handle); - if (pxm < 0 || pxm >= MAX_PXM_DOMAINS) - return NUMA_NO_NODE; return acpi_map_pxm_to_node(pxm); } diff --git a/include/linux/acpi.h b/include/linux/acpi.h index e4da5e3..1b3bbb1 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -289,8 +289,13 @@ extern void acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d); extern void acpi_osi_setup(char *str); #ifdef CONFIG_ACPI_NUMA +int acpi_map_pxm_to_online_node(int pxm); int acpi_get_node(acpi_handle handle); #else +static inline int acpi_map_pxm_to_online_node(int pxm) +{ + return 0; +} static inline int acpi_get_node(acpi_handle handle) { return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/