From patchwork Tue Oct 19 05:09:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alison Schofield X-Patchwork-Id: 12568581 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 922ECC433FE for ; Tue, 19 Oct 2021 05:01:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 743B96128B for ; Tue, 19 Oct 2021 05:01:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232959AbhJSFDc (ORCPT ); Tue, 19 Oct 2021 01:03:32 -0400 Received: from mga12.intel.com ([192.55.52.136]:47127 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229649AbhJSFDb (ORCPT ); Tue, 19 Oct 2021 01:03:31 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10141"; a="208525130" X-IronPort-AV: E=Sophos;i="5.85,383,1624345200"; d="scan'208";a="208525130" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2021 22:01:17 -0700 X-IronPort-AV: E=Sophos;i="5.85,383,1624345200"; d="scan'208";a="550592399" Received: from alison-desk.jf.intel.com (HELO localhost) ([10.54.74.41]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2021 22:01:16 -0700 From: alison.schofield@intel.com To: "Rafael J. Wysocki" , Len Brown , Vishal Verma , Ira Weiny , Ben Widawsky , Dan Williams Cc: Alison Schofield , linux-cxl@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [PATCH v3] ACPI: NUMA: Add a node and memblk for each CFMWS not in SRAT Date: Mon, 18 Oct 2021 22:09:08 -0700 Message-Id: <20211019050908.449231-1-alison.schofield@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org From: Alison Schofield During NUMA init, CXL memory defined in the SRAT Memory Affinity subtable may be assigned to a NUMA node. Since there is no requirement that the SRAT be comprehensive for CXL memory another mechanism is needed to assign NUMA nodes to CXL memory not identified in the SRAT. Use the CXL Fixed Memory Window Structure (CFMWS) of the ACPI CXL Early Discovery Table (CEDT) to find all CXL memory ranges. Create a NUMA node for each CFMWS that is not already assigned to a NUMA node. Add a memblk attaching its host physical address range to the node. Note that these ranges may not actually map any memory at boot time. They may describe persistent capacity or may be present to enable hot-plug. Consumers can use phys_to_target_node() to discover the NUMA node. Signed-off-by: Alison Schofield --- Changes in v3: - Initial variable pxm (Ben) Changes in v2: - Use MAX_NUMNODES as max value when searching node_to_pxm_map() (0-day) - Add braces around single statement for loop (coding style) - Rename acpi_parse_cfmws() to acpi_cxl_cfmws_init to be more like other functions in this file doing similar work. - Comments: remove superflous and state importance of the init order, CFMWS after SRAT, (Ira, Dan) - Add prototype for numa_add_memblk() (0-day) drivers/acpi/numa/srat.c | 70 ++++++++++++++++++++++++++++++++++++++++ drivers/cxl/acpi.c | 8 +++-- include/linux/acpi.h | 1 + 3 files changed, 76 insertions(+), 3 deletions(-) base-commit: 64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc prerequisite-patch-id: f09c67c6b3801f511521fd29c1cc01f5c5b1e9de diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index b8795fc49097..daaaef58f1e6 100644 --- a/drivers/acpi/numa/srat.c +++ b/drivers/acpi/numa/srat.c @@ -300,6 +300,67 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) } #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ +static int __init acpi_cxl_cfmws_init(struct acpi_table_header *acpi_cedt) +{ + struct acpi_cedt_cfmws *cfmws; + acpi_size len, cur = 0; + int i, node, pxm = 0; + void *cedt_subtable; + u64 start, end; + + /* Find the max PXM defined in the SRAT */ + for (i = 0; i < MAX_NUMNODES - 1; i++) { + if (node_to_pxm_map[i] > pxm) + pxm = node_to_pxm_map[i]; + } + /* Start assigning fake PXM values after the SRAT max PXM */ + pxm++; + + len = acpi_cedt->length - sizeof(*acpi_cedt); + cedt_subtable = acpi_cedt + 1; + + while (cur < len) { + struct acpi_cedt_header *c = cedt_subtable + cur; + + if (c->type != ACPI_CEDT_TYPE_CFMWS) + goto next; + + cfmws = cedt_subtable + cur; + if (cfmws->header.length < sizeof(*cfmws)) { + pr_warn_once("CFMWS entry skipped:invalid length:%u\n", + cfmws->header.length); + goto next; + } + + start = cfmws->base_hpa; + end = cfmws->base_hpa + cfmws->window_size; + + /* + * Skip if the SRAT already described + * the NUMA details for this HPA. + */ + node = phys_to_target_node(start); + if (node != NUMA_NO_NODE) + goto next; + + node = acpi_map_pxm_to_node(pxm); + if (node == NUMA_NO_NODE) { + pr_err("ACPI NUMA: Too many proximity domains.\n"); + return -EINVAL; + } + + if (numa_add_memblk(node, start, end) < 0) { + /* CXL driver must handle the NUMA_NO_NODE case */ + pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n", + node, start, end); + } + pxm++; +next: + cur += c->length; + } + return 0; +} + static int __init acpi_parse_slit(struct acpi_table_header *table) { struct acpi_table_slit *slit = (struct acpi_table_slit *)table; @@ -478,6 +539,15 @@ int __init acpi_numa_init(void) /* SLIT: System Locality Information Table */ acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); + /* + * CEDT: CXL Fixed Memory Window Structures (CFMWS) + * must be parsed after the SRAT. It creates NUMA + * Nodes for CXL memory ranges not already defined + * in the SRAT and it assigns PXMs after the max PXM + * defined in the SRAT. + */ + acpi_table_parse(ACPI_SIG_CEDT, acpi_cxl_cfmws_init); + if (cnt < 0) return cnt; else if (!parsed_numa_memblks) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 10120e4e0b9f..ccf73f0a59a7 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -122,9 +122,11 @@ static void cxl_add_cfmws_decoders(struct device *dev, cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1); } else { - dev_dbg(dev, "add: %s range %#llx-%#llx\n", - dev_name(&cxld->dev), cfmws->base_hpa, - cfmws->base_hpa + cfmws->window_size - 1); + dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n", + dev_name(&cxld->dev), + phys_to_target_node(cxld->range.start), + cfmws->base_hpa, + cfmws->base_hpa + cfmws->window_size - 1); } cur += c->length; } diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 974d497a897d..f837fd715440 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -426,6 +426,7 @@ extern bool acpi_osi_is_win8(void); #ifdef CONFIG_ACPI_NUMA int acpi_map_pxm_to_node(int pxm); int acpi_get_node(acpi_handle handle); +int __init numa_add_memblk(int nodeid, u64 start, u64 end); /** * pxm_to_online_node - Map proximity ID to online node