From patchwork Sat Oct 16 05:15:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Widawsky X-Patchwork-Id: 12563221 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 04C56C4332F for ; Sat, 16 Oct 2021 05:15:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E0E7B61181 for ; Sat, 16 Oct 2021 05:15:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243698AbhJPFRy (ORCPT ); Sat, 16 Oct 2021 01:17:54 -0400 Received: from mga11.intel.com ([192.55.52.93]:1750 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243690AbhJPFRv (ORCPT ); Sat, 16 Oct 2021 01:17:51 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10138"; a="225489616" X-IronPort-AV: E=Sophos;i="5.85,377,1624345200"; d="scan'208";a="225489616" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Oct 2021 22:15:44 -0700 X-IronPort-AV: E=Sophos;i="5.85,377,1624345200"; d="scan'208";a="442743316" Received: from asimon-mobl1.amr.corp.intel.com (HELO bad-guy.kumite) ([10.252.133.4]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Oct 2021 22:15:43 -0700 From: Ben Widawsky To: linux-cxl@vger.kernel.org, Chet Douglas Cc: Ben Widawsky , Alison Schofield , Dan Williams , Ira Weiny , Jonathan Cameron , Vishal Verma Subject: [RFC PATCH 20/27] cxl/region: Address space allocation Date: Fri, 15 Oct 2021 22:15:24 -0700 Message-Id: <20211016051531.622613-21-ben.widawsky@intel.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211016051531.622613-1-ben.widawsky@intel.com> References: <20211016051531.622613-1-ben.widawsky@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org When a region is not assigned a host physical address, one is picked by the driver. As the address will determine which CFMWS contains the region, it's usually a better idea to let the driver make this determination. Signed-off-by: Ben Widawsky --- drivers/cxl/region.c | 35 +++++++++++++++++++++++++++++++++-- drivers/cxl/trace.h | 3 +++ 2 files changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/cxl/region.c b/drivers/cxl/region.c index 610c32107860..cd9d696fdd4a 100644 --- a/drivers/cxl/region.c +++ b/drivers/cxl/region.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2021 Intel Corporation. All rights reserved. */ #include +#include #include #include #include @@ -55,6 +56,17 @@ static struct cxl_port *get_root_decoder(const struct cxl_memdev *endpoint) return NULL; } +static void release_cxl_region(void *r) +{ + struct cxl_region *region = (struct cxl_region *)r; + struct cxl_decoder *cxld = cxld_from_region(region); + struct resource *parent_res = &cxld->res; + const struct resource *res = region->res; + + gen_pool_free(cxld->address_space, res->start, resource_size(res)); + __release_region(parent_res, res->start, resource_size(res)); +} + /** * sanitize_region() - Check is region is reasonably configured * @region: The region to check @@ -104,8 +116,27 @@ static int sanitize_region(const struct cxl_region *region) */ static int allocate_address_space(struct cxl_region *region) { - /* TODO */ - return 0; + struct cxl_decoder *cxld = cxld_from_region(region); + unsigned long start; + + start = gen_pool_alloc(cxld->address_space, region->size); + if (!start) { + trace_allocation_failed(region, + "Couldn't allocate address space"); + return -ENOMEM; + } + region->res = + __request_region(&cxld->res, start, region->size, + dev_name(®ion->dev), IORESOURCE_EXCLUSIVE); + + if (IS_ERR(region->res)) { + trace_allocation_failed(region, "Couldn't obtain region"); + gen_pool_free(cxld->address_space, start, region->size); + return PTR_ERR(region->res); + } + + return devm_add_action_or_reset(®ion->dev, release_cxl_region, + region); } /** diff --git a/drivers/cxl/trace.h b/drivers/cxl/trace.h index 8f7f471e15b8..a53f00ba5d0e 100644 --- a/drivers/cxl/trace.h +++ b/drivers/cxl/trace.h @@ -35,6 +35,9 @@ DEFINE_EVENT(cxl_region_template, region_activated, DEFINE_EVENT(cxl_region_template, sanitize_failed, TP_PROTO(const struct cxl_region *region, char *status), TP_ARGS(region, status)); +DEFINE_EVENT(cxl_region_template, allocation_failed, + TP_PROTO(const struct cxl_region *region, char *status), + TP_ARGS(region, status)); #endif /* if !defined (__CXL_TRACE_H__) || defined(TRACE_HEADER_MULTI_READ) */