[PATCH v4 07/12] fpga: dfl: afu: add error reporting support.

[Wu Hao]

Error reporting is one important private feature, it reports error
detected on port and accelerated function unit (AFU). It introduces
several sysfs interfaces to allow userspace to check and clear
errors detected by hardware.

Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxx>
Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx>
Acked-by: Alan Tull <atull@xxxxxxxxxx>
Signed-off-by: Moritz Fischer <mdf@xxxxxxxxxx>
---
v2: switch to device_add/remove_group for sysfs.
v3: update kernel version and date in sysfs doc
v4: remove dev_dbg in init/uinit callback function.
---
 Documentation/ABI/testing/sysfs-platform-dfl-port |  39 ++++
 drivers/fpga/Makefile                             |   1 +
 drivers/fpga/dfl-afu-error.c                      | 221 ++++++++++++++++++++++
 drivers/fpga/dfl-afu-main.c                       |   4 +
 drivers/fpga/dfl-afu.h                            |   4 +
 5 files changed, 269 insertions(+)
 create mode 100644 drivers/fpga/dfl-afu-error.c

diff --git a/Documentation/ABI/testing/sysfs-platform-dfl-port b/Documentation/ABI/testing/sysfs-platform-dfl-port
index 5663441..3b6580b 100644
--- a/Documentation/ABI/testing/sysfs-platform-dfl-port
+++ b/Documentation/ABI/testing/sysfs-platform-dfl-port
@@ -81,3 +81,42 @@ KernelVersion:	5.4
 Contact:	Wu Hao <hao.wu@xxxxxxxxx>
 Description:	Read-only. Read this file to get the status of issued command
 		to userclck_freqcntrcmd.
+
+What:		/sys/bus/platform/devices/dfl-port.0/errors/revision
+Date:		August 2019
+KernelVersion:	5.4
+Contact:	Wu Hao <hao.wu@xxxxxxxxx>
+Description:	Read-only. Read this file to get the revision of this error
+		reporting private feature.
+
+What:		/sys/bus/platform/devices/dfl-port.0/errors/errors
+Date:		August 2019
+KernelVersion:	5.4
+Contact:	Wu Hao <hao.wu@xxxxxxxxx>
+Description:	Read-only. Read this file to get errors detected on port and
+		Accelerated Function Unit (AFU).
+
+What:		/sys/bus/platform/devices/dfl-port.0/errors/first_error
+Date:		August 2019
+KernelVersion:	5.4
+Contact:	Wu Hao <hao.wu@xxxxxxxxx>
+Description:	Read-only. Read this file to get the first error detected by
+		hardware.
+
+What:		/sys/bus/platform/devices/dfl-port.0/errors/first_malformed_req
+Date:		August 2019
+KernelVersion:	5.4
+Contact:	Wu Hao <hao.wu@xxxxxxxxx>
+Description:	Read-only. Read this file to get the first malformed request
+		captured by hardware.
+
+What:		/sys/bus/platform/devices/dfl-port.0/errors/clear
+Date:		August 2019
+KernelVersion:	5.4
+Contact:	Wu Hao <hao.wu@xxxxxxxxx>
+Description:	Write-only. Write error code to this file to clear errors.
+		Write fails with -EINVAL if input parsing fails or input error
+		code doesn't match.
+		Write fails with -EBUSY or -ETIMEDOUT if error can't be cleared
+		as hardware is in low power state (-EBUSY) or not responding
+		(-ETIMEDOUT).
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index 312b937..7255891 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_FPGA_DFL_AFU)		+= dfl-afu.o
 
 dfl-fme-objs := dfl-fme-main.o dfl-fme-pr.o
 dfl-afu-objs := dfl-afu-main.o dfl-afu-region.o dfl-afu-dma-region.o
+dfl-afu-objs += dfl-afu-error.o
 
 # Drivers for FPGAs which implement DFL
 obj-$(CONFIG_FPGA_DFL_PCI)		+= dfl-pci.o
diff --git a/drivers/fpga/dfl-afu-error.c b/drivers/fpga/dfl-afu-error.c
new file mode 100644
index 0000000..c5e0efa
--- /dev/null
+++ b/drivers/fpga/dfl-afu-error.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for FPGA Accelerated Function Unit (AFU) Error Reporting
+ *
+ * Copyright 2019 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Wu Hao <hao.wu@xxxxxxxxxxxxxxx>
+ *   Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
+ *   Joseph Grecco <joe.grecco@xxxxxxxxx>
+ *   Enno Luebbers <enno.luebbers@xxxxxxxxx>
+ *   Tim Whisonant <tim.whisonant@xxxxxxxxx>
+ *   Ananda Ravuri <ananda.ravuri@xxxxxxxxx>
+ *   Mitchel Henry <henry.mitchel@xxxxxxxxx>
+ */
+
+#include <linux/uaccess.h>
+
+#include "dfl-afu.h"
+
+#define PORT_ERROR_MASK		0x8
+#define PORT_ERROR		0x10
+#define PORT_FIRST_ERROR	0x18
+#define PORT_MALFORMED_REQ0	0x20
+#define PORT_MALFORMED_REQ1	0x28
+
+#define ERROR_MASK		GENMASK_ULL(63, 0)
+
+/* mask or unmask port errors by the error mask register. */
+static void __port_err_mask(struct device *dev, bool mask)
+{
+	void __iomem *base;
+
+	base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
+
+	writeq(mask ? ERROR_MASK : 0, base + PORT_ERROR_MASK);
+}
+
+/* clear port errors. */
+static int __port_err_clear(struct device *dev, u64 err)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	void __iomem *base_err, *base_hdr;
+	int ret;
+	u64 v;
+
+	base_err = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
+	base_hdr = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
+
+	/*
+	 * clear Port Errors
+	 *
+	 * - Check for AP6 State
+	 * - Halt Port by keeping Port in reset
+	 * - Set PORT Error mask to all 1 to mask errors
+	 * - Clear all errors
+	 * - Set Port mask to all 0 to enable errors
+	 * - All errors start capturing new errors
+	 * - Enable Port by pulling the port out of reset
+	 */
+
+	/* if device is still in AP6 power state, can not clear any error. */
+	v = readq(base_hdr + PORT_HDR_STS);
+	if (FIELD_GET(PORT_STS_PWR_STATE, v) == PORT_STS_PWR_STATE_AP6) {
+		dev_err(dev, "Could not clear errors, device in AP6 state.\n");
+		return -EBUSY;
+	}
+
+	/* Halt Port by keeping Port in reset */
+	ret = __port_disable(pdev);
+	if (ret)
+		return ret;
+
+	/* Mask all errors */
+	__port_err_mask(dev, true);
+
+	/* Clear errors if err input matches with current port errors.*/
+	v = readq(base_err + PORT_ERROR);
+
+	if (v == err) {
+		writeq(v, base_err + PORT_ERROR);
+
+		v = readq(base_err + PORT_FIRST_ERROR);
+		writeq(v, base_err + PORT_FIRST_ERROR);
+	} else {
+		ret = -EINVAL;
+	}
+
+	/* Clear mask */
+	__port_err_mask(dev, false);
+
+	/* Enable the Port by clear the reset */
+	__port_enable(pdev);
+
+	return ret;
+}
+
+static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	void __iomem *base;
+
+	base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
+
+	return sprintf(buf, "%u\n", dfl_feature_revision(base));
+}
+static DEVICE_ATTR_RO(revision);
+
+static ssize_t errors_show(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
+	void __iomem *base;
+	u64 error;
+
+	base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
+
+	mutex_lock(&pdata->lock);
+	error = readq(base + PORT_ERROR);
+	mutex_unlock(&pdata->lock);
+
+	return sprintf(buf, "0x%llx\n", (unsigned long long)error);
+}
+static DEVICE_ATTR_RO(errors);
+
+static ssize_t first_error_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
+	void __iomem *base;
+	u64 error;
+
+	base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
+
+	mutex_lock(&pdata->lock);
+	error = readq(base + PORT_FIRST_ERROR);
+	mutex_unlock(&pdata->lock);
+
+	return sprintf(buf, "0x%llx\n", (unsigned long long)error);
+}
+static DEVICE_ATTR_RO(first_error);
+
+static ssize_t first_malformed_req_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
+	void __iomem *base;
+	u64 req0, req1;
+
+	base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
+
+	mutex_lock(&pdata->lock);
+	req0 = readq(base + PORT_MALFORMED_REQ0);
+	req1 = readq(base + PORT_MALFORMED_REQ1);
+	mutex_unlock(&pdata->lock);
+
+	return sprintf(buf, "0x%016llx%016llx\n",
+		       (unsigned long long)req1, (unsigned long long)req0);
+}
+static DEVICE_ATTR_RO(first_malformed_req);
+
+static ssize_t clear_store(struct device *dev, struct device_attribute *attr,
+			   const char *buff, size_t count)
+{
+	struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
+	u64 value;
+	int ret;
+
+	if (kstrtou64(buff, 0, &value))
+		return -EINVAL;
+
+	mutex_lock(&pdata->lock);
+	ret = __port_err_clear(dev, value);
+	mutex_unlock(&pdata->lock);
+
+	return ret ? ret : count;
+}
+static DEVICE_ATTR_WO(clear);
+
+static struct attribute *port_err_attrs[] = {
+	&dev_attr_revision.attr,
+	&dev_attr_errors.attr,
+	&dev_attr_first_error.attr,
+	&dev_attr_first_malformed_req.attr,
+	&dev_attr_clear.attr,
+	NULL,
+};
+
+static struct attribute_group port_err_attr_group = {
+	.attrs = port_err_attrs,
+	.name = "errors",
+};
+
+static int port_err_init(struct platform_device *pdev,
+			 struct dfl_feature *feature)
+{
+	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	__port_err_mask(&pdev->dev, false);
+	mutex_unlock(&pdata->lock);
+
+	return device_add_group(&pdev->dev, &port_err_attr_group);
+}
+
+static void port_err_uinit(struct platform_device *pdev,
+			   struct dfl_feature *feature)
+{
+	device_remove_group(&pdev->dev, &port_err_attr_group);
+}
+
+const struct dfl_feature_id port_err_id_table[] = {
+	{.id = PORT_FEATURE_ID_ERROR,},
+	{0,}
+};
+
+const struct dfl_feature_ops port_err_ops = {
+	.init = port_err_init,
+	.uinit = port_err_uinit,
+};
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index e312179..b14df11 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -524,6 +524,10 @@ static void port_afu_uinit(struct platform_device *pdev,
 		.ops = &port_afu_ops,
 	},
 	{
+		.id_table = port_err_id_table,
+		.ops = &port_err_ops,
+	},
+	{
 		.ops = NULL,
 	}
 };
diff --git a/drivers/fpga/dfl-afu.h b/drivers/fpga/dfl-afu.h
index 35e60c5..c3182a2 100644
--- a/drivers/fpga/dfl-afu.h
+++ b/drivers/fpga/dfl-afu.h
@@ -100,4 +100,8 @@ int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
 struct dfl_afu_dma_region *
 afu_dma_region_find(struct dfl_feature_platform_data *pdata,
 		    u64 iova, u64 size);
+
+extern const struct dfl_feature_ops port_err_ops;
+extern const struct dfl_feature_id port_err_id_table[];
+
 #endif /* __DFL_AFU_H */
-- 
1.8.3.1