From patchwork Mon Jan 24 00:29:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12721223 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) (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 4620B2C80 for ; Mon, 24 Jan 2022 00:29:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1642984175; x=1674520175; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Na3Srh7RAlzCpu8KaRMYXfw0Dnvg6QJ1LrH+KrSohok=; b=aaVMl6dOM+z/u07keN015qBwVy6AtzJ4hj1yf4PDPyT7cXmswXXeB8bL 3yrF323+nUvYlSg1kXNF3Wg7z+0fjKT9tg1IYWB7d2+8m9cB9RwpQgaHV IlP5AFcvfI1UYi+J3LzXgm4O5QdpXPhQMCskbLW5xYud/1+mL0I5s+Q3r TbG60Y+9dt35WgC+xHltyUUT//4sgAGJiL4cYqO8xm2zfo/GOXwHLRk7K mFK+SA66tHgLpc+QK4tT4Hdzazx3WVNmU5izo/395vCE4xSzREF3vv2Uf /z1pTY1D7f2qvh86N6vHzZCknIJxSruE1uITSYNZJHscYXzvjGT+WvMQ4 Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10236"; a="332288793" X-IronPort-AV: E=Sophos;i="5.88,311,1635231600"; d="scan'208";a="332288793" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jan 2022 16:29:32 -0800 X-IronPort-AV: E=Sophos;i="5.88,311,1635231600"; d="scan'208";a="768516986" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jan 2022 16:29:32 -0800 Subject: [PATCH v3 10/40] cxl/core: Convert decoder range to resource From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Jonathan Cameron , Ben Widawsky , linux-pci@vger.kernel.org, nvdimm@lists.linux.dev Date: Sun, 23 Jan 2022 16:29:31 -0800 Message-ID: <164298417191.3018233.5201055578165414714.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <164298411792.3018233.7493009997525360044.stgit@dwillia2-desk3.amr.corp.intel.com> References: <164298411792.3018233.7493009997525360044.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Ben Widawsky CXL decoders manage address ranges in a hierarchical fashion whereby a leaf is a unique subregion of its parent decoder (midlevel or root). It therefore makes sense to use the resource API for handling this. Reviewed-by: Dan Williams Reviewed-by: Jonathan Cameron (v1) Signed-off-by: Ben Widawsky Signed-off-by: Dan Williams --- drivers/cxl/acpi.c | 22 ++++++++-------------- drivers/cxl/core/port.c | 23 +++++++++++++++++++++-- drivers/cxl/cxl.h | 8 ++++++-- 3 files changed, 35 insertions(+), 18 deletions(-) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index c656a49a11a9..da70f1836db6 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -108,10 +108,8 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions); cxld->target_type = CXL_DECODER_EXPANDER; - cxld->range = (struct range){ - .start = cfmws->base_hpa, - .end = cfmws->base_hpa + cfmws->window_size - 1, - }; + cxld->platform_res = (struct resource)DEFINE_RES_MEM(cfmws->base_hpa, + cfmws->window_size); cxld->interleave_ways = CFMWS_INTERLEAVE_WAYS(cfmws); cxld->interleave_granularity = CFMWS_INTERLEAVE_GRANULARITY(cfmws); @@ -121,14 +119,13 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, else rc = cxl_decoder_autoremove(dev, cxld); if (rc) { - dev_err(dev, "Failed to add decoder for %#llx-%#llx\n", - cfmws->base_hpa, - cfmws->base_hpa + cfmws->window_size - 1); + dev_err(dev, "Failed to add decoder for %pr\n", + &cxld->platform_res); return 0; } - 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); + dev_dbg(dev, "add: %s node: %d range %pr\n", dev_name(&cxld->dev), + phys_to_target_node(cxld->platform_res.start), + &cxld->platform_res); return 0; } @@ -270,10 +267,7 @@ static int add_host_bridge_uport(struct device *match, void *arg) cxld->interleave_ways = 1; cxld->interleave_granularity = PAGE_SIZE; cxld->target_type = CXL_DECODER_EXPANDER; - cxld->range = (struct range) { - .start = 0, - .end = -1, - }; + cxld->platform_res = (struct resource)DEFINE_RES_MEM(0, 0); device_lock(&port->dev); dport = list_first_entry(&port->dports, typeof(*dport), list); diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index c5e74c6f04e8..63c76cb2a2ec 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -46,8 +46,14 @@ static ssize_t start_show(struct device *dev, struct device_attribute *attr, char *buf) { struct cxl_decoder *cxld = to_cxl_decoder(dev); + u64 start; - return sysfs_emit(buf, "%#llx\n", cxld->range.start); + if (is_root_decoder(dev)) + start = cxld->platform_res.start; + else + start = cxld->decoder_range.start; + + return sysfs_emit(buf, "%#llx\n", start); } static DEVICE_ATTR_ADMIN_RO(start); @@ -55,8 +61,14 @@ static ssize_t size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct cxl_decoder *cxld = to_cxl_decoder(dev); + u64 size; + + if (is_root_decoder(dev)) + size = resource_size(&cxld->platform_res); + else + size = range_len(&cxld->decoder_range); - return sysfs_emit(buf, "%#llx\n", range_len(&cxld->range)); + return sysfs_emit(buf, "%#llx\n", size); } static DEVICE_ATTR_RO(size); @@ -546,6 +558,13 @@ int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map) if (rc) return rc; + /* + * Platform decoder resources should show up with a reasonable name. All + * other resources are just sub ranges within the main decoder resource. + */ + if (is_root_decoder(dev)) + cxld->platform_res.name = dev_name(dev); + return device_add(dev); } EXPORT_SYMBOL_NS_GPL(cxl_decoder_add, CXL); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 38779409a419..bfd95acea66c 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -179,7 +179,8 @@ enum cxl_decoder_type { * struct cxl_decoder - CXL address range decode configuration * @dev: this decoder's device * @id: kernel device name id - * @range: address range considered by this decoder + * @platform_res: address space resources considered by root decoder + * @decoder_range: address space resources considered by midlevel decoder * @interleave_ways: number of cxl_dports in this decode * @interleave_granularity: data stride per dport * @target_type: accelerator vs expander (type2 vs type3) selector @@ -190,7 +191,10 @@ enum cxl_decoder_type { struct cxl_decoder { struct device dev; int id; - struct range range; + union { + struct resource platform_res; + struct range decoder_range; + }; int interleave_ways; int interleave_granularity; enum cxl_decoder_type target_type;