From patchwork Fri Jan 28 00:26:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Widawsky X-Patchwork-Id: 12727586 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E5E963FD5; Fri, 28 Jan 2022 00:27:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1643329646; x=1674865646; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=JRLB7CUs7371NAYrkD3KPcwzK+rjDWnGSvurqfC0vT4=; b=VEaI+scpWLeso+qQzl1gxDNncptXDctbUD2bfAKHrnJzTJza6eMjT5Jq pRR4rrskNNbQL6pANtg82Egcsxy0401LCCZnG5usps+gpHjgwlE1PIjdU LkfqNSbSrEiNftFnDBbzNrazY0uboGGI8s2YQTD1ZF5qeaaWKsMoVUulK m7boVO3c9bclTC6pMDF4N5UFFwBKaSfiYRT6fYCrEx5AEN2QUEhsG49z7 M6qpkHw3wED33vUnJQqtW2nNqPYjHXsA2KxzSkzRIw2S7JjlCCjmLPdVm hDHlxCt4HvddQ95n7biNbA8my7z+hXAggBcn2Irt4MbQDiGDGhtnWLMF6 Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10239"; a="226982073" X-IronPort-AV: E=Sophos;i="5.88,322,1635231600"; d="scan'208";a="226982073" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2022 16:27:26 -0800 X-IronPort-AV: E=Sophos;i="5.88,322,1635231600"; d="scan'208";a="674909627" Received: from vrao2-mobl1.gar.corp.intel.com (HELO localhost.localdomain) ([10.252.129.6]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2022 16:27:25 -0800 From: Ben Widawsky To: linux-cxl@vger.kernel.org Cc: patches@lists.linux.dev, Ben Widawsky , Alison Schofield , Dan Williams , Ira Weiny , Jonathan Cameron , Vishal Verma , Bjorn Helgaas , nvdimm@lists.linux.dev, linux-pci@vger.kernel.org Subject: [PATCH v3 06/14] cxl/region: Address space allocation Date: Thu, 27 Jan 2022 16:26:59 -0800 Message-Id: <20220128002707.391076-7-ben.widawsky@intel.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20220128002707.391076-1-ben.widawsky@intel.com> References: <20220128002707.391076-1-ben.widawsky@intel.com> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/drivers/cxl/region.c b/drivers/cxl/region.c index cc41939a2f0a..5588873dd250 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 @@ -64,6 +65,20 @@ static struct cxl_port *get_root_decoder(const struct cxl_memdev *endpoint) return NULL; } +static void release_cxl_region(void *r) +{ + struct cxl_region *cxlr = (struct cxl_region *)r; + struct cxl_decoder *rootd = rootd_from_region(cxlr); + struct resource *res = &rootd->platform_res; + resource_size_t start, size; + + start = cxlr->res->start; + size = resource_size(cxlr->res); + + __release_region(res, start, size); + gen_pool_free(rootd->address_space, start, size); +} + /** * sanitize_region() - Check is region is reasonably configured * @cxlr: The region to check @@ -129,8 +144,29 @@ static int sanitize_region(const struct cxl_region *cxlr) */ static int allocate_address_space(struct cxl_region *cxlr) { - /* TODO */ - return 0; + struct cxl_decoder *rootd = rootd_from_region(cxlr); + unsigned long start; + + start = gen_pool_alloc(rootd->address_space, cxlr->config.size); + if (!start) { + dev_dbg(&cxlr->dev, "Couldn't allocate %lluM of address space", + cxlr->config.size >> 20); + return -ENOMEM; + } + + cxlr->res = + __request_region(&rootd->platform_res, start, cxlr->config.size, + dev_name(&cxlr->dev), IORESOURCE_MEM); + if (!cxlr->res) { + dev_dbg(&cxlr->dev, "Couldn't obtain region from %s (%pR)\n", + dev_name(&rootd->dev), &rootd->platform_res); + gen_pool_free(rootd->address_space, start, cxlr->config.size); + return -ENOMEM; + } + + dev_dbg(&cxlr->dev, "resource %pR", cxlr->res); + + return devm_add_action_or_reset(&cxlr->dev, release_cxl_region, cxlr); } /**