fpga: dfl: afu: add AFU interrupt support

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 <[email protected]>
Signed-off-by: Wu Hao <[email protected]>
Signed-off-by: Xu Yilun <[email protected]>
Reviewed-by: Marcelo Tosatti <[email protected]>
Acked-by: Wu Hao <[email protected]>
Signed-off-by: Moritz Fischer <[email protected]>

diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index 357cd5d9b26728ae8b13ead713a2380a8eb08408..7c84feea73549a7053720858c47bdbae223b424e 100644 (file)
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -529,6 +529,30 @@ 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,
@@ -546,6 +570,10 @@ static struct dfl_feature_driver port_feature_drvs[] = {
                .id_table = port_stp_id_table,
                .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 b6495ea412ec808537dd355606758ea7ae4c519c..1621b077bf212e49fcdace40b728ce5b55090399 100644 (file)
--- 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 */
 
 /**