[PATCH v5 6/7] fpga: dfl: afu: add AFU interrupt support

[Xu Yilun]

AFU (Accelerated Function Unit) is dynamic region of the DFL based FPGA,
and always defined by users. Some DFL based FPGA cards allow users to
implement their own interrupts in AFU. In order to support this,
hardware implements a new UINT (AFU Interrupt) private feature with
related capability register which describes the number of supported
AFU interrupts as well as the local index of the interrupts for
software enumeration, and from software side, driver follows the common
DFL interrupt notification and handling mechanism, and it implements
two ioctls below for user to query number of irqs supported and set/unset
interrupt triggers.

 Ioctls:
 * DFL_FPGA_PORT_UINT_GET_IRQ_NUM
   get the number of irqs, which is used to determine how many interrupts
   UINT feature supports.

 * DFL_FPGA_PORT_UINT_SET_IRQ
   set/unset eventfds as AFU interrupt triggers.

Signed-off-by: Luwei Kang <luwei.kang@xxxxxxxxx>
Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx>
Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxx>
Acked-by: Wu Hao <hao.wu@xxxxxxxxx>
----
v2: use DFL_FPGA_PORT_UINT_GET_IRQ_NUM instead of
    DFL_FPGA_PORT_UINT_GET_INFO
    Delete flags field for DFL_FPGA_PORT_UINT_SET_IRQ
v3: put_user() instead of copy_to_user()
    improves comments
v4: use common functions to handle irq ioctls
v5: Minor fixes for Hao's comments
---
 drivers/fpga/dfl-afu-main.c   | 28 ++++++++++++++++++++++++++++
 include/uapi/linux/fpga-dfl.h | 23 +++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index b1ed7b4..753cda4 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -530,6 +530,30 @@ static const struct dfl_feature_ops port_stp_ops = {
 	.init = port_stp_init,
 };
 
+static long
+port_uint_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
+		unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case DFL_FPGA_PORT_UINT_GET_IRQ_NUM:
+		return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);
+	case DFL_FPGA_PORT_UINT_SET_IRQ:
+		return dfl_feature_ioctl_set_irq(pdev, feature, arg);
+	default:
+		dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
+		return -ENODEV;
+	}
+}
+
+static const struct dfl_feature_id port_uint_id_table[] = {
+	{.id = PORT_FEATURE_ID_UINT,},
+	{0,}
+};
+
+static const struct dfl_feature_ops port_uint_ops = {
+	.ioctl = port_uint_ioctl,
+};
+
 static struct dfl_feature_driver port_feature_drvs[] = {
 	{
 		.id_table = port_hdr_id_table,
@@ -548,6 +572,10 @@ static struct dfl_feature_driver port_feature_drvs[] = {
 		.ops = &port_stp_ops,
 	},
 	{
+		.id_table = port_uint_id_table,
+		.ops = &port_uint_ops,
+	},
+	{
 		.ops = NULL,
 	}
 };
diff --git a/include/uapi/linux/fpga-dfl.h b/include/uapi/linux/fpga-dfl.h
index b6495ea..1621b07 100644
--- a/include/uapi/linux/fpga-dfl.h
+++ b/include/uapi/linux/fpga-dfl.h
@@ -187,6 +187,29 @@ struct dfl_fpga_irq_set {
 					     DFL_PORT_BASE + 6,	\
 					     struct dfl_fpga_irq_set)
 
+/**
+ * DFL_FPGA_PORT_UINT_GET_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 7,
+ *								__u32 num_irqs)
+ *
+ * Get the number of irqs supported by the fpga AFU interrupt private
+ * feature.
+ * Return: 0 on success, -errno on failure.
+ */
+#define DFL_FPGA_PORT_UINT_GET_IRQ_NUM	_IOR(DFL_FPGA_MAGIC,	\
+					     DFL_PORT_BASE + 7, __u32)
+
+/**
+ * DFL_FPGA_PORT_UINT_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_PORT_BASE + 8,
+ *						struct dfl_fpga_irq_set)
+ *
+ * Set fpga AFU interrupt trigger if evtfds[n] is valid.
+ * Unset related interrupt trigger if evtfds[n] is a negative value.
+ * Return: 0 on success, -errno on failure.
+ */
+#define DFL_FPGA_PORT_UINT_SET_IRQ	_IOW(DFL_FPGA_MAGIC,	\
+					     DFL_PORT_BASE + 8,	\
+					     struct dfl_fpga_irq_set)
+
 /* IOCTLs for FME file descriptor */
 
 /**
-- 
2.7.4