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Date:   Wed, 20 Jun 2018 16:41:46 -0700
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Subject: [PATCH v5 4/5] PCI/AER: Add sysfs attributes for rootport cumulative stats
From:   Rajat Jain <rajatja@google.com>
To:     Bjorn Helgaas <bhelgaas@google.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Frederick Lawler <fred@fredlawl.com>,
        Oza Pawandeep <poza@codeaurora.org>,
        Keith Busch <keith.busch@intel.com>,
        Alexandru Gagniuc <mr.nuke.me@gmail.com>,
        Thomas Tai <thomas.tai@oracle.com>,
        "Steven Rostedt (VMware)" <rostedt@goodmis.org>,
        linux-pci@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, Jes Sorensen <jsorensen@fb.com>,
        Kyle McMartin <jkkm@fb.com>, rajatxjain@gmail.com,
        helgaas@kernel.org
Cc:     Rajat Jain <rajatja@google.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Add sysfs attributes for rootport statistics (that are cumulative
of all the ERR_* messages seen on this PCI hierarchy).

Signed-off-by: Rajat Jain <rajatja@google.com>
---
v5: Same as v4
v4: Make pci_rootport_aer_stats_incr() static, 1 hunk of previous patch was included by mistake, fix that.
v3: Merge everything in aer.c

 drivers/pci/pcie/aer.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index c989bb5bb6f1..d9def7fabd81 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -586,6 +586,9 @@ static DEVICE_ATTR_RO(field)
 aer_stats_aggregate_attr(dev_total_cor_errs);
 aer_stats_aggregate_attr(dev_total_fatal_errs);
 aer_stats_aggregate_attr(dev_total_nonfatal_errs);
+aer_stats_aggregate_attr(rootport_total_cor_errs);
+aer_stats_aggregate_attr(rootport_total_fatal_errs);
+aer_stats_aggregate_attr(rootport_total_nonfatal_errs);
 
 #define aer_stats_breakdown_attr(field, stats_array, strings_array)	\
 	static ssize_t							\
@@ -619,6 +622,9 @@ static struct attribute *aer_stats_attrs[] __ro_after_init = {
 	&dev_attr_dev_total_nonfatal_errs.attr,
 	&dev_attr_dev_breakdown_correctable.attr,
 	&dev_attr_dev_breakdown_uncorrectable.attr,
+	&dev_attr_rootport_total_cor_errs.attr,
+	&dev_attr_rootport_total_fatal_errs.attr,
+	&dev_attr_rootport_total_nonfatal_errs.attr,
 	NULL
 };
 
@@ -631,6 +637,12 @@ static umode_t aer_stats_attrs_are_visible(struct kobject *kobj,
 	if (!pdev->aer_stats)
 		return 0;
 
+	if ((a == &dev_attr_rootport_total_cor_errs.attr ||
+	     a == &dev_attr_rootport_total_fatal_errs.attr ||
+	     a == &dev_attr_rootport_total_nonfatal_errs.attr) &&
+	    pci_pcie_type(pdev) != PCI_EXP_TYPE_ROOT_PORT)
+		return 0;
+
 	return a->mode;
 }
 
@@ -674,6 +686,25 @@ static void pci_dev_aer_stats_incr(struct pci_dev *pdev,
 			counter[i]++;
 }
 
+static void pci_rootport_aer_stats_incr(struct pci_dev *pdev,
+				 struct aer_err_source *e_src)
+{
+	struct aer_stats *aer_stats = pdev->aer_stats;
+
+	if (!aer_stats)
+		return;
+
+	if (e_src->status & PCI_ERR_ROOT_COR_RCV)
+		aer_stats->rootport_total_cor_errs++;
+
+	if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
+		if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
+			aer_stats->rootport_total_fatal_errs++;
+		else
+			aer_stats->rootport_total_nonfatal_errs++;
+	}
+}
+
 static void __print_tlp_header(struct pci_dev *dev,
 			       struct aer_header_log_regs *t)
 {
@@ -1124,6 +1155,8 @@ static void aer_isr_one_error(struct aer_rpc *rpc,
 	struct pci_dev *pdev = rpc->rpd;
 	struct aer_err_info *e_info = &rpc->e_info;
 
+	pci_rootport_aer_stats_incr(pdev, e_src);
+
 	/*
 	 * There is a possibility that both correctable error and
 	 * uncorrectable error being logged. Report correctable error first.
-- 
2.18.0.rc1.244.gcf134e6275-goog