From patchwork Thu Feb 3 04:02:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12733832 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54535C433EF for ; Thu, 3 Feb 2022 04:02:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238296AbiBCECH (ORCPT ); Wed, 2 Feb 2022 23:02:07 -0500 Received: from mga04.intel.com ([192.55.52.120]:35443 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234348AbiBCECH (ORCPT ); Wed, 2 Feb 2022 23:02:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1643860927; x=1675396927; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=DuOHKHshGKKrTuFr3+TUPuFe/umk+40ivph/qTKR9rg=; b=YLYvj9LIK/OFmyrTXvh12Lt4Q9F3pNAeyt3I5s2NDNd9+VDoUk7j6Uc1 OxXiLDD4Db4+Ryy87dZWweeG2R7rT0fUEmYJAvERNhppoSa3hlGj5dfcL Qiw7vYARgDLBtPyTpe+yLOd+AqVYr0olqylxr1F6IOsIA0AS9lSigTONi 1PWPR9CecxSdfiTTxlXkO4UvJh0IyUxBV6by3F1g5QgICEeXO/M1bSC2r P/vGxmfLomGSst6lipaFnznG1B6nC+Giqz/KwQju/uXxIoPa5XflRvo3b EJCQLzGTGqG1ihLC/lgIYzlHWel1jfueu12Zfkyn3dL0xsypwosCLY7mF A==; X-IronPort-AV: E=McAfee;i="6200,9189,10246"; a="246905017" X-IronPort-AV: E=Sophos;i="5.88,338,1635231600"; d="scan'208";a="246905017" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Feb 2022 20:02:07 -0800 X-IronPort-AV: E=Sophos;i="5.88,338,1635231600"; d="scan'208";a="771666614" 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; 02 Feb 2022 20:02:06 -0800 Subject: [PATCH v4 35/40] cxl/core/port: Add endpoint decoders From: Dan Williams To: linux-cxl@vger.kernel.org Cc: Ben Widawsky , Jonathan Cameron , linux-pci@vger.kernel.org, nvdimm@lists.linux.dev Date: Wed, 02 Feb 2022 20:02:06 -0800 Message-ID: <164386092069.765089.14895687988217608642.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <164298430609.3018233.3860765171749496117.stgit@dwillia2-desk3.amr.corp.intel.com> References: <164298430609.3018233.3860765171749496117.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org From: Ben Widawsky Recall that a CXL Port is any object that publishes a CXL HDM Decoder Capability structure. That is Host Bridge and Switches that have been enabled so far. Now, add decoder support to the 'endpoint' CXL Ports registered by the cxl_mem driver. They mostly share the same enumeration as Bridges and Switches, but witout a target list. The target of endpoint decode is device-internal DPA space, not another downstream port. Signed-off-by: Ben Widawsky Reviewed-by: Jonathan Cameron [djbw: clarify changelog, hookup enumeration in the port driver] Signed-off-by: Dan Williams --- Changes since v3: - Resolve conflicts from changes to preceding patches in the series. drivers/cxl/core/hdm.c | 8 +++++- drivers/cxl/core/port.c | 63 ++++++++++++++++++++++++++++++++++++++++++----- drivers/cxl/cxl.h | 1 + drivers/cxl/port.c | 17 +++++++------ 4 files changed, 73 insertions(+), 16 deletions(-) diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index 80280db316c0..05b0b292e72d 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -186,6 +186,9 @@ static void init_hdm_decoder(struct cxl_decoder *cxld, int *target_map, else cxld->target_type = CXL_DECODER_ACCELERATOR; + if (is_cxl_endpoint(to_cxl_port(cxld->dev.parent))) + return; + target_list.value = ioread64_hi_lo(hdm + CXL_HDM_DECODER0_TL_LOW(which)); for (i = 0; i < cxld->interleave_ways; i++) @@ -225,7 +228,10 @@ int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm) int rc, target_count = cxlhdm->target_count; struct cxl_decoder *cxld; - cxld = cxl_switch_decoder_alloc(port, target_count); + if (is_cxl_endpoint(port)) + cxld = cxl_endpoint_decoder_alloc(port); + else + cxld = cxl_switch_decoder_alloc(port, target_count); if (IS_ERR(cxld)) { dev_warn(&port->dev, "Failed to allocate the decoder\n"); diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 359d4303de9a..bc18d339738b 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -228,6 +228,22 @@ static const struct attribute_group *cxl_decoder_switch_attribute_groups[] = { NULL, }; +static struct attribute *cxl_decoder_endpoint_attrs[] = { + &dev_attr_target_type.attr, + NULL, +}; + +static struct attribute_group cxl_decoder_endpoint_attribute_group = { + .attrs = cxl_decoder_endpoint_attrs, +}; + +static const struct attribute_group *cxl_decoder_endpoint_attribute_groups[] = { + &cxl_decoder_base_attribute_group, + &cxl_decoder_endpoint_attribute_group, + &cxl_base_attribute_group, + NULL, +}; + static void cxl_decoder_release(struct device *dev) { struct cxl_decoder *cxld = to_cxl_decoder(dev); @@ -237,6 +253,12 @@ static void cxl_decoder_release(struct device *dev) kfree(cxld); } +static const struct device_type cxl_decoder_endpoint_type = { + .name = "cxl_decoder_endpoint", + .release = cxl_decoder_release, + .groups = cxl_decoder_endpoint_attribute_groups, +}; + static const struct device_type cxl_decoder_switch_type = { .name = "cxl_decoder_switch", .release = cxl_decoder_release, @@ -249,6 +271,11 @@ static const struct device_type cxl_decoder_root_type = { .groups = cxl_decoder_root_attribute_groups, }; +static bool is_endpoint_decoder(struct device *dev) +{ + return dev->type == &cxl_decoder_endpoint_type; +} + bool is_root_decoder(struct device *dev) { return dev->type == &cxl_decoder_root_type; @@ -1129,7 +1156,9 @@ static int decoder_populate_targets(struct cxl_decoder *cxld, * cxl_decoder_alloc - Allocate a new CXL decoder * @port: owning port of this decoder * @nr_targets: downstream targets accessible by this decoder. All upstream - * ports and root ports must have at least 1 target. + * ports and root ports must have at least 1 target. Endpoint + * devices will have 0 targets. Callers wishing to register an + * endpoint device should specify 0. * * A port should contain one or more decoders. Each of those decoders enable * some address space for CXL.mem utilization. A decoder is expected to be @@ -1145,7 +1174,7 @@ static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, struct device *dev; int rc = 0; - if (nr_targets > CXL_DECODER_MAX_INTERLEAVE || nr_targets == 0) + if (nr_targets > CXL_DECODER_MAX_INTERLEAVE) return ERR_PTR(-EINVAL); cxld = kzalloc(struct_size(cxld, target, nr_targets), GFP_KERNEL); @@ -1166,6 +1195,8 @@ static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, dev->bus = &cxl_bus_type; if (is_cxl_root(port)) cxld->dev.type = &cxl_decoder_root_type; + else if (is_cxl_endpoint(port)) + cxld->dev.type = &cxl_decoder_endpoint_type; else cxld->dev.type = &cxl_decoder_switch_type; @@ -1215,13 +1246,28 @@ EXPORT_SYMBOL_NS_GPL(cxl_root_decoder_alloc, CXL); struct cxl_decoder *cxl_switch_decoder_alloc(struct cxl_port *port, unsigned int nr_targets) { - if (is_cxl_root(port)) + if (is_cxl_root(port) || is_cxl_endpoint(port)) return ERR_PTR(-EINVAL); return cxl_decoder_alloc(port, nr_targets); } EXPORT_SYMBOL_NS_GPL(cxl_switch_decoder_alloc, CXL); +/** + * cxl_endpoint_decoder_alloc - Allocate an endpoint decoder + * @port: owning port of this decoder + * + * Return: A new cxl decoder to be registered by cxl_decoder_add() + */ +struct cxl_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port) +{ + if (!is_cxl_endpoint(port)) + return ERR_PTR(-EINVAL); + + return cxl_decoder_alloc(port, 0); +} +EXPORT_SYMBOL_NS_GPL(cxl_endpoint_decoder_alloc, CXL); + /** * cxl_decoder_add_locked - Add a decoder with targets * @cxld: The cxl decoder allocated by cxl_decoder_alloc() @@ -1256,12 +1302,15 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map) if (cxld->interleave_ways < 1) return -EINVAL; + dev = &cxld->dev; + port = to_cxl_port(cxld->dev.parent); - rc = decoder_populate_targets(cxld, port, target_map); - if (rc) - return rc; + if (!is_endpoint_decoder(dev)) { + rc = decoder_populate_targets(cxld, port, target_map); + if (rc) + return rc; + } - dev = &cxld->dev; rc = dev_set_name(dev, "decoder%d.%d", port->id, cxld->id); if (rc) return rc; diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index f5e5b4ac8228..990b6670222e 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -346,6 +346,7 @@ struct cxl_decoder *cxl_root_decoder_alloc(struct cxl_port *port, struct cxl_decoder *cxl_switch_decoder_alloc(struct cxl_port *port, unsigned int nr_targets); int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map); +struct cxl_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port); int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map); int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld); int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint); diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c index 4d4e23b9adff..d420da5fc39c 100644 --- a/drivers/cxl/port.c +++ b/drivers/cxl/port.c @@ -40,16 +40,17 @@ static int cxl_port_probe(struct device *dev) struct cxl_memdev *cxlmd = to_cxl_memdev(port->uport); get_device(&cxlmd->dev); - return devm_add_action_or_reset(dev, schedule_detach, cxlmd); + rc = devm_add_action_or_reset(dev, schedule_detach, cxlmd); + if (rc) + return rc; + } else { + rc = devm_cxl_port_enumerate_dports(port); + if (rc < 0) + return rc; + if (rc == 1) + return devm_cxl_add_passthrough_decoder(port); } - rc = devm_cxl_port_enumerate_dports(port); - if (rc < 0) - return rc; - - if (rc == 1) - return devm_cxl_add_passthrough_decoder(port); - cxlhdm = devm_cxl_setup_hdm(port); if (IS_ERR(cxlhdm)) return PTR_ERR(cxlhdm);