linux-kernel - [PATCH v5 3/5] PCI/AER: Add sysfs attributes to provide breakdown of AERs

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Message-Id: <20180620234147.48438-3-rajatja@google.com>
Date:   Wed, 20 Jun 2018 16:41:45 -0700
From:   Rajat Jain <rajatja@...gle.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Frederick Lawler <fred@...dlawl.com>,
        Oza Pawandeep <poza@...eaurora.org>,
        Keith Busch <keith.busch@...el.com>,
        Alexandru Gagniuc <mr.nuke.me@...il.com>,
        Thomas Tai <thomas.tai@...cle.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        linux-pci@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jes Sorensen <jsorensen@...com>,
        Kyle McMartin <jkkm@...com>, rajatxjain@...il.com,
        helgaas@...nel.org
Cc:     Rajat Jain <rajatja@...gle.com>
Subject: [PATCH v5 3/5] PCI/AER: Add sysfs attributes to provide breakdown of AERs

Add sysfs attributes to provide breakdown of the AERs seen,
into different type of correctable or uncorrectable errors:

dev_breakdown_correctable
dev_breakdown_uncorrectable

Signed-off-by: Rajat Jain <rajatja@...gle.com>
---
v5: Fix the signature
v4: use "%llu" in place of "%llx"
v3: Merge everything in aer.c

 drivers/pci/pcie/aer.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index ce0d675d7bd3..c989bb5bb6f1 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -587,10 +587,38 @@ aer_stats_aggregate_attr(dev_total_cor_errs);
 aer_stats_aggregate_attr(dev_total_fatal_errs);
 aer_stats_aggregate_attr(dev_total_nonfatal_errs);
 
+#define aer_stats_breakdown_attr(field, stats_array, strings_array)	\
+	static ssize_t							\
+	field##_show(struct device *dev, struct device_attribute *attr,	\
+		     char *buf)						\
+{									\
+	unsigned int i;							\
+	char *str = buf;						\
+	struct pci_dev *pdev = to_pci_dev(dev);				\
+	u64 *stats = pdev->aer_stats->stats_array;			\
+	for (i = 0; i < ARRAY_SIZE(strings_array); i++) {		\
+		if (strings_array[i])					\
+			str += sprintf(str, "%s = 0x%llu\n",		\
+				       strings_array[i], stats[i]);	\
+		else if (stats[i])					\
+			str += sprintf(str, #stats_array "bit[%d] = 0x%llu\n",\
+				       i, stats[i]);			\
+	}								\
+	return str-buf;							\
+}									\
+static DEVICE_ATTR_RO(field)
+
+aer_stats_breakdown_attr(dev_breakdown_correctable, dev_cor_errs,
+			 aer_correctable_error_string);
+aer_stats_breakdown_attr(dev_breakdown_uncorrectable, dev_uncor_errs,
+			 aer_uncorrectable_error_string);
+
 static struct attribute *aer_stats_attrs[] __ro_after_init = {
 	&dev_attr_dev_total_cor_errs.attr,
 	&dev_attr_dev_total_fatal_errs.attr,
 	&dev_attr_dev_total_nonfatal_errs.attr,
+	&dev_attr_dev_breakdown_correctable.attr,
+	&dev_attr_dev_breakdown_uncorrectable.attr,
 	NULL
 };
 
-- 
2.18.0.rc1.244.gcf134e6275-goog