From patchwork Tue Feb 27 08:33:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kobayashi,Daisuke" X-Patchwork-Id: 13573350 Received: from esa6.hc1455-7.c3s2.iphmx.com (esa6.hc1455-7.c3s2.iphmx.com [68.232.139.139]) (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 B3A8C7A723; Tue, 27 Feb 2024 08:31:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.139.139 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709022720; cv=none; b=BF4Ci/FwzzJPotUrenVoiBBDCDqyeRS1cSaTpMtW+/wNyhzuevXgHUAY68VhImFnluo2gfZjueqY7QLuzFjSfeg2p+oUTDSCINJGzG8Y3Y4bf6UjV8r2AYHCF13Hh8uKqhKY3odHEGx7ridBMZWi7nRAtwGJqHj1c+S8htrzfJ8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709022720; c=relaxed/simple; bh=MdImde67V1+KeHYJRF9wIvQoZwXcoa6xLwBzOuoI9Cw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H40Tyd4Jkm7pU/eFEKfvI2BL/CXN09GMKqvy2sP+tqpi9zIXvjalBdmTjy4sRTNVPYWx/VMTiCnGCoVA56+qT3niJhwyyKI1NHGkwGx+S9CC25tD0LX6ONhUyU035CzbVZ/uJG/UkMW8Lc9HVzQ3lNFg5IgfDsz0VYIS6LdQV4I= 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=guTBRE1Z; arc=none smtp.client-ip=68.232.139.139 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="guTBRE1Z" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=fujitsu.com; i=@fujitsu.com; q=dns/txt; s=fj2; t=1709022716; x=1740558716; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=MdImde67V1+KeHYJRF9wIvQoZwXcoa6xLwBzOuoI9Cw=; b=guTBRE1ZdtQZukir9J9DBY3puCno7UcBr6wHn29IoczdlGZKLgwo+VXZ iQewiybMu/DAHJyvUaQIfSZ6NrXF860kkxXewskvFO+CCAZ3X2CX73+cR eWi1XiOKRggaA+81xojifGVlesWQOdBli4ShwkOq2tZQf7f4V57rRU0oA i+U35+Tx4knaZ7/SmFG6pSmmBbXZ/oMnE8y3yJDARu9KwOb6HEuUUINgv dPrqy0zuA0twBEU7MJDPcDPdXhIg13srPSvVRVBCtTpCm9MbjWRbETuLw 7qIHkxi1PCpYqVS8KuHGWQeyjDRCe1Fn70xdvs269KZ/M4CHeJIklAxgz A==; X-IronPort-AV: E=McAfee;i="6600,9927,10996"; a="152321666" X-IronPort-AV: E=Sophos;i="6.06,187,1705330800"; d="scan'208";a="152321666" Received: from unknown (HELO oym-r4.gw.nic.fujitsu.com) ([210.162.30.92]) by esa6.hc1455-7.c3s2.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2024 17:30:45 +0900 Received: from oym-m2.gw.nic.fujitsu.com (oym-nat-oym-m2.gw.nic.fujitsu.com [192.168.87.59]) by oym-r4.gw.nic.fujitsu.com (Postfix) with ESMTP id 9DF6D1590F3; Tue, 27 Feb 2024 17:30:44 +0900 (JST) Received: from m3002.s.css.fujitsu.com (msm3.b.css.fujitsu.com [10.128.233.104]) by oym-m2.gw.nic.fujitsu.com (Postfix) with ESMTP id C5E2E6E01A; Tue, 27 Feb 2024 17:30:43 +0900 (JST) Received: from cxl-test.. (unknown [10.118.236.45]) by m3002.s.css.fujitsu.com (Postfix) with ESMTP id 8BBFD20C19DC; Tue, 27 Feb 2024 17:30:43 +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, "Kobayashi,Daisuke" Subject: [RFC PATCH v2 1/3] Add sysfs attribute for CXL 1.1 device link status Date: Tue, 27 Feb 2024 17:33:11 +0900 Message-ID: <20240227083313.87699-2-kobayashi.da-06@fujitsu.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240227083313.87699-1-kobayashi.da-06@fujitsu.com> References: <20240227083313.87699-1-kobayashi.da-06@fujitsu.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 This patch implements a process to output the link status information of the CXL1.1 device to sysfs. The values of the registers related to the link status are outputted into three separate files. In CXL1.1, the link status of the device is included in the RCRB mapped to the memory mapped register area. This function accesses the address where the device's RCRB is mapped. Signed-off-by: "Kobayashi,Daisuke" --- drivers/cxl/pci.c | 201 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 201 insertions(+) diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 4fd1f207c84e..8302249819d0 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -780,6 +780,203 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge, return 0; } +static u32 cxl_rcrb_to_linkcap(struct device *dev, resource_size_t rcrb) +{ + void __iomem *addr; + u8 offset = 0; + u32 cap_hdr; + u32 linkcap = 0; + + if (WARN_ON_ONCE(rcrb == CXL_RESOURCE_NONE)) + return 0; + + if (!request_mem_region(rcrb, SZ_4K, dev_name(dev))) + return 0; + + addr = ioremap(rcrb, SZ_4K); + if (!addr) + goto out; + + offset = readw(addr + PCI_CAPABILITY_LIST); + offset = offset & 0x00ff; + cap_hdr = readl(addr + offset); + while ((cap_hdr & 0x000000ff) != PCI_CAP_ID_EXP) { + offset = (cap_hdr >> 8) & 0x000000ff; + if (!offset) + break; + cap_hdr = readl(addr + offset); + } + + if (offset) + dev_dbg(dev, "found PCIe capability (0x%x)\n", offset); + + linkcap = readl(addr + offset + PCI_EXP_LNKCAP); + iounmap(addr); +out: + release_mem_region(rcrb, SZ_4K); + + return linkcap; +} + +static ssize_t rcd_link_cap_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_port *port; + struct cxl_dport *dport; + struct device *parent = dev->parent; + struct pci_dev *parent_pdev = to_pci_dev(parent); + u32 linkcap; + + port = cxl_pci_find_port(parent_pdev, &dport); + if (!port) + return -EINVAL; + + linkcap = cxl_rcrb_to_linkcap(dev, dport->rcrb.base + SZ_4K); + return sysfs_emit(buf, "%x\n", linkcap); +} +static DEVICE_ATTR_RO(rcd_link_cap); + +static u16 cxl_rcrb_to_linkctr(struct device *dev, resource_size_t rcrb) +{ + void __iomem *addr; + u8 offset = 0; + u16 linkctrl = 0; + u32 cap_hdr; + + if (WARN_ON_ONCE(rcrb == CXL_RESOURCE_NONE)) + return 0; + + if (!request_mem_region(rcrb, SZ_4K, dev_name(dev))) + return 0; + + addr = ioremap(rcrb, SZ_4K); + if (!addr) + goto out; + + offset = readw(addr + PCI_CAPABILITY_LIST); + offset = offset & 0x00ff; + cap_hdr = readl(addr + offset); + while ((cap_hdr & 0x000000ff) != PCI_CAP_ID_EXP) { + offset = (cap_hdr >> 8) & 0x000000ff; + if (!offset) + break; + cap_hdr = readl(addr + offset); + } + + if (offset) + dev_dbg(dev, "found PCIe capability (0x%x)\n", offset); + linkctrl = readw(addr + offset + PCI_EXP_LNKCTL); + + iounmap(addr); +out: + release_mem_region(rcrb, SZ_4K); + + return linkctrl; +} + +static ssize_t rcd_link_ctrl_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_port *port; + struct cxl_dport *dport; + struct device *parent = dev->parent; + struct pci_dev *parent_pdev = to_pci_dev(parent); + u16 linkctrl; + + port = cxl_pci_find_port(parent_pdev, &dport); + if (!port) + return -EINVAL; + + + linkctrl = cxl_rcrb_to_linkctr(dev, dport->rcrb.base + SZ_4K); + + return sysfs_emit(buf, "%x\n", linkctrl); +} +static DEVICE_ATTR_RO(rcd_link_ctrl); + +static u16 cxl_rcrb_to_linkstatus(struct device *dev, resource_size_t rcrb) +{ + void __iomem *addr; + u8 offset = 0; + u16 linksta = 0; + u32 cap_hdr; + + if (WARN_ON_ONCE(rcrb == CXL_RESOURCE_NONE)) + return 0; + + if (!request_mem_region(rcrb, SZ_4K, dev_name(dev))) + return 0; + + addr = ioremap(rcrb, SZ_4K); + if (!addr) + goto out; + + offset = readw(addr + PCI_CAPABILITY_LIST); + offset = offset & 0x00ff; + cap_hdr = readl(addr + offset); + while ((cap_hdr & 0x000000ff) != PCI_CAP_ID_EXP) { + offset = (cap_hdr >> 8) & 0x000000ff; + if (!offset) + break; + cap_hdr = readl(addr + offset); + } + + if (offset) + dev_dbg(dev, "found PCIe capability (0x%x)\n", offset); + + linksta = readw(addr + offset + PCI_EXP_LNKSTA); + iounmap(addr); +out: + release_mem_region(rcrb, SZ_4K); + + return linksta; +} + +static ssize_t rcd_link_status_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_port *port; + struct cxl_dport *dport; + struct device *parent = dev->parent; + struct pci_dev *parent_pdev = to_pci_dev(parent); + u16 linkstatus; + + port = cxl_pci_find_port(parent_pdev, &dport); + if (!port) + return -EINVAL; + + + linkstatus = cxl_rcrb_to_linkstatus(dev, dport->rcrb.base + SZ_4K); + + return sysfs_emit(buf, "%x\n", linkstatus); +} +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) { @@ -806,6 +1003,9 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (IS_ERR(mds)) return PTR_ERR(mds); cxlds = &mds->cxlds; + device_create_file(&pdev->dev, &dev_attr_rcd_link_cap); + device_create_file(&pdev->dev, &dev_attr_rcd_link_ctrl); + device_create_file(&pdev->dev, &dev_attr_rcd_link_status); pci_set_drvdata(pdev, cxlds); cxlds->rcd = is_cxl_restricted(pdev); @@ -967,6 +1167,7 @@ static struct pci_driver cxl_pci_driver = { .err_handler = &cxl_error_handlers, .driver = { .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .dev_groups = cxl_rcd_groups, }, }; From patchwork Tue Feb 27 08:33:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kobayashi,Daisuke" X-Patchwork-Id: 13573348 Received: from esa2.hc1455-7.c3s2.iphmx.com (esa2.hc1455-7.c3s2.iphmx.com [207.54.90.48]) (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 24DEE6A351; Tue, 27 Feb 2024 08:30:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=207.54.90.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709022655; cv=none; b=ItePaQrYqyuGP5vsA3G7zCgY01bf6EnBUYY2K8r7RjMCTcftwQBMd8NeZRToPjtgYfvlB05byqaTsMt7ZnIQhO0exTKkaMzC6R4tGhqO8f5KbmeIz7duVEIc9XnyEYOWM3DjOwDrDjBwNiI5REtw4lt9dfI+zRp58nnS9myn2Cw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709022655; c=relaxed/simple; bh=bPSnlvhM/EbpGy25SiekuNdcEivAYfCgLjkCyRbM4L0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gc6wxDvks8oy/ag0Q13HXX709hl9bT9XayO8HlvVKsX5PEEtS6N+Xw4qPix5yfVlLGG8BNTFZQWAB8M+KIpEXW8tdeT6boBQrf+Rdl7rwjVdnAdUPNJ3p3QLxDzeKOgktiN7g0xFjJ381/LRJnrbw0o26ugTwQapxi4rP8WG2+U= 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=OWbolQ+t; arc=none smtp.client-ip=207.54.90.48 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="OWbolQ+t" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=fujitsu.com; i=@fujitsu.com; q=dns/txt; s=fj2; t=1709022654; x=1740558654; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bPSnlvhM/EbpGy25SiekuNdcEivAYfCgLjkCyRbM4L0=; b=OWbolQ+t7u+b26T4rACTD+0y6ISZMpvhNwCfcZq9+9hEEEPGOspB6Z/p dgPMSEWoF9XKVx7uDlwsNO1WDeEIQSPEzJkSW8YDCGBqIEMWuSASYSyKx TO0BRCfLRDWdiduehQhFinUTYyM+UmBuY6PJ/y6aBeKnGXQUiBjhQOXFE 3s41Yrwg7sjiV1aCBYYTx7TnQN50S7TDZ3DTmqKsq5fRf2GVYJMQOY4Hh u2wdr/v1RAymvWrukmH/FSmYUJkgPoTUUeCtjXCbiBAkbmi77E+V/6Ebj ePODYawuO+w/2I6xK9rdlhv4yxG3l2R2nsHs5/baOOqy9fEDO9vGJMC15 w==; X-IronPort-AV: E=McAfee;i="6600,9927,10996"; a="150557150" X-IronPort-AV: E=Sophos;i="6.06,187,1705330800"; d="scan'208";a="150557150" Received: from unknown (HELO yto-r3.gw.nic.fujitsu.com) ([218.44.52.219]) by esa2.hc1455-7.c3s2.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2024 17:30:49 +0900 Received: from yto-m3.gw.nic.fujitsu.com (yto-nat-yto-m3.gw.nic.fujitsu.com [192.168.83.66]) by yto-r3.gw.nic.fujitsu.com (Postfix) with ESMTP id D1267E8CDE; Tue, 27 Feb 2024 17:30:46 +0900 (JST) Received: from m3002.s.css.fujitsu.com (msm3.b.css.fujitsu.com [10.128.233.104]) by yto-m3.gw.nic.fujitsu.com (Postfix) with ESMTP id 180F0E6300; Tue, 27 Feb 2024 17:30:46 +0900 (JST) Received: from cxl-test.. (unknown [10.118.236.45]) by m3002.s.css.fujitsu.com (Postfix) with ESMTP id E76192020A50; Tue, 27 Feb 2024 17:30:45 +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, "Kobayashi,Daisuke" Subject: [RFC PATCH v2 2/3] Remove conditional branch that is not suitable for cxl1.1 devices Date: Tue, 27 Feb 2024 17:33:12 +0900 Message-ID: <20240227083313.87699-3-kobayashi.da-06@fujitsu.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240227083313.87699-1-kobayashi.da-06@fujitsu.com> References: <20240227083313.87699-1-kobayashi.da-06@fujitsu.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 This patch removes conditional branching that does not comply with the specifications. In the existing code, there is a conditional branch that compares "chbs->length" with "CXL_RCRB_SIZE". However, according to the specifications, "chbs->length" indicates the length of the CHBS structure in the cedt, not the size of the configuration space. Therefore, since this condition does not comply with the specifications(cxl3.0 specification 9.17.1), remove it. Signed-off-by: "Kobayashi,Daisuke" --- drivers/cxl/acpi.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index dcf2b39e1048..cf15c5130428 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -477,10 +477,6 @@ static int cxl_get_chbs_iter(union acpi_subtable_headers *header, void *arg, if (!chbs->base) return 0; - if (chbs->cxl_version == ACPI_CEDT_CHBS_VERSION_CXL11 && - chbs->length != CXL_RCRB_SIZE) - return 0; - ctx->base = chbs->base; return 0; From patchwork Tue Feb 27 08:33:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kobayashi,Daisuke" X-Patchwork-Id: 13573351 Received: from esa9.hc1455-7.c3s2.iphmx.com (esa9.hc1455-7.c3s2.iphmx.com [139.138.36.223]) (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 852DD7AE63; Tue, 27 Feb 2024 08:32:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=139.138.36.223 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709022724; cv=none; b=U/JXJ/RO4xKcNYq0PXogUYxtqhnXhqEk162ePMGVlJxgXybbzNLaMhAyzzGLSooeAAcIXNNVuIpLYh6Pj62SFFypjkjAJVtjFdR4RgDDUULj7XT4/TOSc3mLsmqtN7wb8KQssY8hFkhrIzmfqWWIFCWQlDR1QV7XCuZOmaJyKnk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709022724; c=relaxed/simple; bh=zPEJAftUnJywsTWFXG9H+ANBuz9ByKBrf21PEmeG1vk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=n4DeVrPbJ3QeTSADbjbzgXrHaQO1/lIencS+WaZrli7aReRNO7U1orj1NKGB+TKXuPowIYsL9CXAMCo8nHxIxzn/LpIXArfwAToaNqQDAKwvpeYvoivpcXAlMKBqL0GoUbyCQE89r6Go3aJgXEu/7+6hnoBRDGrOsM1w1m2wwYc= 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=jWPV1Hsg; arc=none smtp.client-ip=139.138.36.223 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="jWPV1Hsg" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=fujitsu.com; i=@fujitsu.com; q=dns/txt; s=fj2; t=1709022722; x=1740558722; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zPEJAftUnJywsTWFXG9H+ANBuz9ByKBrf21PEmeG1vk=; b=jWPV1Hsg5w3T72BfHFeQrgzpuPdnGAqvIr2iR5ekP6yNQLbI9ubmN5JC atZ1KzIG5xZ+mLxhOVfkqP90dIeO2sqUGDnbp5dp35TxYHoxBsl2PT32v 5CuBu1ywG/hLp9XO8Jdj0SiH/NI1Zo2u3PT1ZyFB5b5psFtuM2n9X+aHi 2UhfVwaKhBjxT/Sz/KCmcI/vi9SA1fD0Vc7vbdkyqFx6+RNh94s6RWEAG PNhMLLIHpl4y+KJN0hpi6cfE1rC08MHBLc63oeLSw5o4N0pcq5xGKqg7e C0q9uUytf2FTCX0zLkjzkGne+o40zIOv3TIhLJ8PNj9P4E+YpY3Ho5eUA Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10996"; a="139007771" X-IronPort-AV: E=Sophos;i="6.06,187,1705330800"; d="scan'208";a="139007771" Received: from unknown (HELO yto-r2.gw.nic.fujitsu.com) ([218.44.52.218]) by esa9.hc1455-7.c3s2.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2024 17:30:50 +0900 Received: from yto-m2.gw.nic.fujitsu.com (yto-nat-yto-m2.gw.nic.fujitsu.com [192.168.83.65]) by yto-r2.gw.nic.fujitsu.com (Postfix) with ESMTP id 4CB6A5DDE7; Tue, 27 Feb 2024 17:30:48 +0900 (JST) Received: from m3002.s.css.fujitsu.com (msm3.b.css.fujitsu.com [10.128.233.104]) by yto-m2.gw.nic.fujitsu.com (Postfix) with ESMTP id 8B199D65D9; Tue, 27 Feb 2024 17:30:47 +0900 (JST) Received: from cxl-test.. (unknown [10.118.236.45]) by m3002.s.css.fujitsu.com (Postfix) with ESMTP id 60E612020A50; Tue, 27 Feb 2024 17:30:47 +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, "Kobayashi,Daisuke" Subject: [RFC PATCH v2 3/3] lspci: Add function to display cxl1.1 device link status Date: Tue, 27 Feb 2024 17:33:13 +0900 Message-ID: <20240227083313.87699-4-kobayashi.da-06@fujitsu.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240227083313.87699-1-kobayashi.da-06@fujitsu.com> References: <20240227083313.87699-1-kobayashi.da-06@fujitsu.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 This patch adds a function to output the link status of the CXL1.1 device when it is connected. In CXL1.1, the link status of the device is included in the RCRB mapped to the memory mapped register area. The value of that register is outputted to sysfs, and based on that, displays the link status information. Signed-off-by: "Kobayashi,Daisuke" --- ls-caps.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) diff --git a/ls-caps.c b/ls-caps.c index 1b63262..5c60321 100644 --- a/ls-caps.c +++ b/ls-caps.c @@ -10,6 +10,8 @@ #include #include +#include +#include #include "lspci.h" @@ -1381,6 +1383,97 @@ static void cap_express_slot2(struct device *d UNUSED, int where UNUSED) /* No capabilities that require this field in PCIe rev2.0 spec. */ } +#define OBJNAMELEN 1024 +#define OBJBUFSIZE 64 +static int +get_rcd_sysfs_obj_file(struct pci_dev *d, char *object, char *result) +{ + char namebuf[OBJNAMELEN]; + int n = snprintf(namebuf, OBJNAMELEN, "%s/devices/%04x:%02x:%02x.%d/%s", + pci_get_param(d->access, "sysfs.path"), + d->domain, d->bus, d->dev, d->func, object); + if (n < 0 || n >= OBJNAMELEN){ + d->access->error("Failed to get filename"); + return -1; + } + int fd = open(namebuf, O_RDONLY); + if(fd < 0) + return -1; + n = read(fd, result, OBJBUFSIZE); + if (n < 0 || n >= OBJBUFSIZE){ + d->access->error("Failed to read the file"); + return -1; + } + return 0; +} + +static void cap_express_link_rcd(struct device *d){ + u32 t, aspm, cap_speed, cap_width, sta_speed, sta_width; + u16 w; + struct pci_dev *pdev = d->dev; + char buf[OBJBUFSIZE]; + + if(get_rcd_sysfs_obj_file(pdev, "rcd_link_cap", buf)) + return; + t = (u32)strtoul(buf, NULL, 16); + + aspm = (t & PCI_EXP_LNKCAP_ASPM) >> 10; + cap_speed = t & PCI_EXP_LNKCAP_SPEED; + cap_width = (t & PCI_EXP_LNKCAP_WIDTH) >> 4; + printf("\t\tLnkCap:\tPort #%d, Speed %s, Width x%d, ASPM %s", + t >> 24, + link_speed(cap_speed), cap_width, + aspm_support(aspm)); + if (aspm) + { + printf(", Exit Latency "); + if (aspm & 1) + printf("L0s %s", latency_l0s((t & PCI_EXP_LNKCAP_L0S) >> 12)); + if (aspm & 2) + printf("%sL1 %s", (aspm & 1) ? ", " : "", + latency_l1((t & PCI_EXP_LNKCAP_L1) >> 15)); + } + printf("\n"); + printf("\t\t\tClockPM%c Surprise%c LLActRep%c BwNot%c ASPMOptComp%c\n", + FLAG(t, PCI_EXP_LNKCAP_CLOCKPM), + FLAG(t, PCI_EXP_LNKCAP_SURPRISE), + FLAG(t, PCI_EXP_LNKCAP_DLLA), + FLAG(t, PCI_EXP_LNKCAP_LBNC), + FLAG(t, PCI_EXP_LNKCAP_AOC)); + + if(!get_rcd_sysfs_obj_file(pdev, "rcd_link_ctrl", buf)){ + w = (u16)strtoul(buf, NULL, 16); + printf("\t\tLnkCtl:\tASPM %s;", aspm_enabled(w & PCI_EXP_LNKCTL_ASPM)); + printf(" Disabled%c CommClk%c\n\t\t\tExtSynch%c ClockPM%c AutWidDis%c BWInt%c AutBWInt%c\n", + FLAG(w, PCI_EXP_LNKCTL_DISABLE), + FLAG(w, PCI_EXP_LNKCTL_CLOCK), + FLAG(w, PCI_EXP_LNKCTL_XSYNCH), + FLAG(w, PCI_EXP_LNKCTL_CLOCKPM), + FLAG(w, PCI_EXP_LNKCTL_HWAUTWD), + FLAG(w, PCI_EXP_LNKCTL_BWMIE), + FLAG(w, PCI_EXP_LNKCTL_AUTBWIE)); + } + + if(!get_rcd_sysfs_obj_file(pdev, "rcd_link_status", buf)){ + w = (u16)strtoul(buf, NULL, 16); + sta_speed = w & PCI_EXP_LNKSTA_SPEED; + sta_width = (w & PCI_EXP_LNKSTA_WIDTH) >> 4; + printf("\t\tLnkSta:\tSpeed %s%s, Width x%d%s\n", + link_speed(sta_speed), + link_compare(PCI_EXP_TYPE_ROOT_INT_EP, sta_speed, cap_speed), + sta_width, + link_compare(PCI_EXP_TYPE_ROOT_INT_EP, sta_width, cap_width)); + printf("\t\t\tTrErr%c Train%c SlotClk%c DLActive%c BWMgmt%c ABWMgmt%c\n", + FLAG(w, PCI_EXP_LNKSTA_TR_ERR), + FLAG(w, PCI_EXP_LNKSTA_TRAIN), + FLAG(w, PCI_EXP_LNKSTA_SL_CLK), + FLAG(w, PCI_EXP_LNKSTA_DL_ACT), + FLAG(w, PCI_EXP_LNKSTA_BWMGMT), + FLAG(w, PCI_EXP_LNKSTA_AUTBW)); + } + return; +} + static int cap_express(struct device *d, int where, int cap) { @@ -1445,6 +1538,9 @@ cap_express(struct device *d, int where, int cap) cap_express_dev(d, where, type); if (link) cap_express_link(d, where, type); + else if (type == PCI_EXP_TYPE_ROOT_INT_EP) + cap_express_link_rcd(d); + if (slot) cap_express_slot(d, where); if (type == PCI_EXP_TYPE_ROOT_PORT || type == PCI_EXP_TYPE_ROOT_EC)