From patchwork Wed Apr 24 05:01:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Daisuke Kobayashi (Fujitsu)" X-Patchwork-Id: 13641183 Received: from esa10.hc1455-7.c3s2.iphmx.com (esa10.hc1455-7.c3s2.iphmx.com [139.138.36.225]) (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 EF894328DB; Wed, 24 Apr 2024 04:59:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=139.138.36.225 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713934792; cv=none; b=AOhFdZlmoGUe0HK6Ev16PAXBUxnLfCk9EINvs4IhYr2tTavxyucEjsDFgJwX0TJk4H9o3g5ITbTDjCDphoUTgy6/IIYCttilKh2Uf9DzuggcnzAtX45jlnCUYzaeaJFOtAioemfuBbkPUiBlLyd3aFzkte+Ij2PgDlbP/tsXVIA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713934792; c=relaxed/simple; bh=osBiAtgiI/y48b+hgDmQmco3S8kOJXH2PbWG46vZP8U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DSmcdNdBZ3HzDt4E31zwOEkO2xzhaDJadRZ+PLPbNKi8Rq/eUO8sCoPQEenl13HCfnaVq3TUwC0LBbyIOmqyCNaFIqD2jNHZ3zjz1YO47OLFkEosh5LVF3qiaOzlP1PVGWUXlBDXJhkF63lGek10bbYbDjYd3b1UYygeOIXaQpY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=fujitsu.com; spf=pass smtp.mailfrom=fujitsu.com; dkim=pass (2048-bit key) header.d=fujitsu.com header.i=@fujitsu.com header.b=E6oXAzqe; arc=none smtp.client-ip=139.138.36.225 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=fujitsu.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=fujitsu.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=fujitsu.com header.i=@fujitsu.com header.b="E6oXAzqe" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=fujitsu.com; i=@fujitsu.com; q=dns/txt; s=fj2; t=1713934790; x=1745470790; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=osBiAtgiI/y48b+hgDmQmco3S8kOJXH2PbWG46vZP8U=; b=E6oXAzqeoKDFtQRbubq9fqbQI58XFYEZIIi4iT0Ap1ndSr3HusufxzTd mxCkJN+XS8fCSUlrmQYeySGHEk9mxKFY0Lno+w1sDI7sw2TLZJGhKvpiy n51fMpLMJ54XURn27icNwNafKlEwRbsDEoU9VdW/Qdf8acZjqa3qu6jEB zzQV7NYJx71zP42Ti2IMPlQtztkl5LRWZWC9gDabVa99eunecDWnJPAKo +FkgE4Oqxmdunxhs5h7yuucXVUSKJWbod5z+99d9/17Egno9ei+Yctkb4 gAHgV7HSPk27X/FZdZ+rWs5aFj2+vXQS0PRksiYyzcvaVAHvIhBGdnpfw w==; X-IronPort-AV: E=McAfee;i="6600,9927,11053"; a="144122128" X-IronPort-AV: E=Sophos;i="6.07,225,1708354800"; d="scan'208";a="144122128" Received: from unknown (HELO yto-r2.gw.nic.fujitsu.com) ([218.44.52.218]) by esa10.hc1455-7.c3s2.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Apr 2024 13:58:37 +0900 Received: from yto-m4.gw.nic.fujitsu.com (yto-nat-yto-m4.gw.nic.fujitsu.com [192.168.83.67]) by yto-r2.gw.nic.fujitsu.com (Postfix) with ESMTP id 56847C6905; Wed, 24 Apr 2024 13:58:35 +0900 (JST) Received: from m3004.s.css.fujitsu.com (m3004.s.css.fujitsu.com [10.128.233.124]) by yto-m4.gw.nic.fujitsu.com (Postfix) with ESMTP id 9D800D3F35; Wed, 24 Apr 2024 13:58:34 +0900 (JST) Received: from cxl-test.. (unknown [10.118.236.45]) by m3004.s.css.fujitsu.com (Postfix) with ESMTP id 7137020059A9; Wed, 24 Apr 2024 13:58:34 +0900 (JST) From: "Kobayashi,Daisuke" To: kobayashi.da-06@jp.fujitsu.com, linux-cxl@vger.kernel.org Cc: y-goto@fujitsu.com, linux-pci@vger.kernel.org, mj@ucw.cz, dan.j.williams@intel.com, dave.jiang@intel.com, "Kobayashi,Daisuke" Subject: [PATCH v6 1/2] cxl/core/regs: Add rcd_regs initialization at __rcrb_to_component() Date: Wed, 24 Apr 2024 14:01:01 +0900 Message-ID: <20240424050102.26788-2-kobayashi.da-06@fujitsu.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240424050102.26788-1-kobayashi.da-06@fujitsu.com> References: <20240424050102.26788-1-kobayashi.da-06@fujitsu.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 Add rcd_regs and its initialization at __rcrb_to_component() to cache the cxl1.1 device link status information. Reduce access to the memory map area where the RCRB is located by caching the cxl1.1 device link status information. Signed-off-by: "Kobayashi,Daisuke" Reviewed-by: Jonathan Cameron --- drivers/cxl/core/core.h | 4 +++- drivers/cxl/core/regs.c | 16 ++++++++++++++++ drivers/cxl/cxl.h | 3 +++ 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h index 3b64fb1b9ed0..66f62b5bb9f7 100644 --- a/drivers/cxl/core/core.h +++ b/drivers/cxl/core/core.h @@ -74,7 +74,9 @@ resource_size_t __rcrb_to_component(struct device *dev, struct cxl_rcrb_info *ri, enum cxl_rcrb which); u16 cxl_rcrb_to_aer(struct device *dev, resource_size_t rcrb); - +#define PCI_RCRB_CAP_LIST_MASK GENMASK(7, 0) +#define PCI_RCRB_CAP_HDR_ID_MASK GENMASK(7, 0) +#define PCI_RCRB_CAP_HDR_NEXT_MASK GENMASK(15, 8) extern struct rw_semaphore cxl_dpa_rwsem; extern struct rw_semaphore cxl_region_rwsem; diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c index 372786f80955..1ad58c464488 100644 --- a/drivers/cxl/core/regs.c +++ b/drivers/cxl/core/regs.c @@ -514,6 +514,8 @@ resource_size_t __rcrb_to_component(struct device *dev, struct cxl_rcrb_info *ri u32 bar0, bar1; u16 cmd; u32 id; + u16 offset; + u32 cap_hdr; if (which == CXL_RCRB_UPSTREAM) rcrb += SZ_4K; @@ -537,6 +539,20 @@ resource_size_t __rcrb_to_component(struct device *dev, struct cxl_rcrb_info *ri cmd = readw(addr + PCI_COMMAND); bar0 = readl(addr + PCI_BASE_ADDRESS_0); bar1 = readl(addr + PCI_BASE_ADDRESS_1); + offset = FIELD_GET(PCI_RCRB_CAP_LIST_MASK, readw(addr + PCI_CAPABILITY_LIST)); + cap_hdr = readl(addr + offset); + while ((FIELD_GET(PCI_RCRB_CAP_HDR_ID_MASK, cap_hdr)) != PCI_CAP_ID_EXP) { + offset = FIELD_GET(PCI_RCRB_CAP_HDR_NEXT_MASK, cap_hdr); + if (offset == 0 || offset > SZ_4K) + break; + cap_hdr = readl(addr + offset); + } + if (offset) { + ri->rcd_lnkcap = readl(addr + offset + PCI_EXP_LNKCAP); + ri->rcd_lnkctrl = readl(addr + offset + PCI_EXP_LNKCTL); + ri->rcd_lnkstatus = readl(addr + offset + PCI_EXP_LNKSTA); + } + iounmap(addr); release_mem_region(rcrb, SZ_4K); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 003feebab79b..808818ccc255 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -646,6 +646,9 @@ cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev) struct cxl_rcrb_info { resource_size_t base; + u16 rcd_lnkstatus; + u16 rcd_lnkctrl; + u32 rcd_lnkcap; u16 aer_cap; }; From patchwork Wed Apr 24 05:01:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Daisuke Kobayashi (Fujitsu)" X-Patchwork-Id: 13641182 Received: from esa4.hc1455-7.c3s2.iphmx.com (esa4.hc1455-7.c3s2.iphmx.com [68.232.139.117]) (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 CF304328DB; Wed, 24 Apr 2024 04:58:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.139.117 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713934730; cv=none; b=D4aWc6zWgf3AIJPGdHyCDBo59pMl5HEVzNjSRiI8mapZMss0invRLecVDsphyybEEyocDpmxoSCd4NZSnN+t3jsnppFRLSIvBCb+tWfGwPqeTS2G2JEtUe6fbWPH5uV+kK0VyFlEnMBDff5PYNy2v9DnwfOkBSXzR9K1fVC8EbI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; 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(unknown [10.118.236.45]) by m3004.s.css.fujitsu.com (Postfix) with ESMTP id AF44220059A9; Wed, 24 Apr 2024 13:58:35 +0900 (JST) From: "Kobayashi,Daisuke" To: kobayashi.da-06@jp.fujitsu.com, linux-cxl@vger.kernel.org Cc: y-goto@fujitsu.com, linux-pci@vger.kernel.org, mj@ucw.cz, dan.j.williams@intel.com, dave.jiang@intel.com, "Kobayashi,Daisuke" Subject: [PATCH v6 2/2] cxl/pci: Add sysfs attribute for CXL 1.1 device link status Date: Wed, 24 Apr 2024 14:01:02 +0900 Message-ID: <20240424050102.26788-3-kobayashi.da-06@fujitsu.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240424050102.26788-1-kobayashi.da-06@fujitsu.com> References: <20240424050102.26788-1-kobayashi.da-06@fujitsu.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 Add sysfs attribute for CXL 1.1 device link status to the cxl pci device. In CXL1.1, the link status of the device is included in the RCRB mapped to the memory mapped register area. Critically, that arrangement makes the link status and control registers invisible to existing PCI user tooling. Export those registers via sysfs with the expectation that PCI user tooling will alternatively look for these sysfs files when attempting to access to these CXL 1.1 endpoints registers. Signed-off-by: "Kobayashi,Daisuke" Reviewed-by: Jonathan Cameron --- drivers/cxl/pci.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 2ff361e756d6..c10797adde2c 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -786,6 +786,106 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge, return 0; } +static ssize_t rcd_link_cap_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_dev_state *cxlds = dev_get_drvdata(dev); + struct cxl_memdev *cxlmd = cxlds->cxlmd; + struct device *endpoint_parent; + struct cxl_dport *dport; + struct cxl_port *port; + + port = cxl_mem_find_port(cxlmd, &dport); + if (!port) + return -EINVAL; + + endpoint_parent = port->uport_dev; + if (!endpoint_parent) + return -ENXIO; + + guard(device)(endpoint_parent); + if (!endpoint_parent->driver) + return -ENXIO; + + return sysfs_emit(buf, "%x\n", dport->rcrb.rcd_lnkcap); +} +static DEVICE_ATTR_RO(rcd_link_cap); + +static ssize_t rcd_link_ctrl_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_dev_state *cxlds = dev_get_drvdata(dev); + struct cxl_memdev *cxlmd = cxlds->cxlmd; + struct device *endpoint_parent; + struct cxl_dport *dport; + struct cxl_port *port; + + port = cxl_mem_find_port(cxlmd, &dport); + if (!port) + return -EINVAL; + + endpoint_parent = port->uport_dev; + if (!endpoint_parent) + return -ENXIO; + + guard(device)(endpoint_parent); + if (!endpoint_parent->driver) + return -ENXIO; + + return sysfs_emit(buf, "%x\n", dport->rcrb.rcd_lnkctrl); +} +static DEVICE_ATTR_RO(rcd_link_ctrl); + +static ssize_t rcd_link_status_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_dev_state *cxlds = dev_get_drvdata(dev); + struct cxl_memdev *cxlmd = cxlds->cxlmd; + struct device *endpoint_parent; + struct cxl_dport *dport; + struct cxl_port *port; + + port = cxl_mem_find_port(cxlmd, &dport); + if (!port) + return -EINVAL; + + endpoint_parent = port->uport_dev; + if (!endpoint_parent) + return -ENXIO; + + guard(device)(endpoint_parent); + if (!endpoint_parent->driver) + return -ENXIO; + + return sysfs_emit(buf, "%x\n", dport->rcrb.rcd_lnkstatus); +} +static DEVICE_ATTR_RO(rcd_link_status); + +static struct attribute *cxl_rcd_attrs[] = { + &dev_attr_rcd_link_cap.attr, + &dev_attr_rcd_link_ctrl.attr, + &dev_attr_rcd_link_status.attr, + NULL +}; + +static umode_t cxl_rcd_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct pci_dev *pdev = to_pci_dev(dev); + + if (is_cxl_restricted(pdev)) + return a->mode; + + return 0; +} + +static struct attribute_group cxl_rcd_group = { + .attrs = cxl_rcd_attrs, + .is_visible = cxl_rcd_visible, +}; +__ATTRIBUTE_GROUPS(cxl_rcd); + static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct pci_host_bridge *host_bridge = pci_find_host_bridge(pdev->bus); @@ -969,6 +1069,7 @@ static struct pci_driver cxl_pci_driver = { .id_table = cxl_mem_pci_tbl, .probe = cxl_pci_probe, .err_handler = &cxl_error_handlers, + .dev_groups = cxl_rcd_groups, .driver = { .probe_type = PROBE_PREFER_ASYNCHRONOUS, },