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Subject[PATCH v3 7/7] Documentation: fpga: dfl: add descriptions for interrupt related interfaces.
This patch adds introductions of interrupt related interfaces for FME
error reporting, port error reporting and AFU user interrupts features.

Signed-off-by: Luwei Kang <>
Signed-off-by: Wu Hao <>
Signed-off-by: Xu Yilun <>
v2: Update Documents cause change of irq ioctl interfaces.
v3: No change
Documentation/fpga/dfl.rst | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
index 094fc8a..c7ed3e4 100644
--- a/Documentation/fpga/dfl.rst
+++ b/Documentation/fpga/dfl.rst
@@ -89,6 +89,8 @@ The following functions are exposed through ioctls:
- Program bitstream (DFL_FPGA_FME_PORT_PR)
- Assign port to PF (DFL_FPGA_FME_PORT_ASSIGN)
- Release port from PF (DFL_FPGA_FME_PORT_RELEASE)
+- Get number of irqs of FME global error (DFL_FPGA_FME_ERR_GET_IRQ_NUM)
+- Set interrupt trigger for FME error (DFL_FPGA_FME_ERR_SET_IRQ)

More functions are exposed through sysfs
@@ -144,6 +146,10 @@ The following functions are exposed through ioctls:
+- Get number of irqs of port error (DFL_FPGA_PORT_ERR_GET_IRQ_NUM)
+- Set interrupt trigger for port error (DFL_FPGA_PORT_ERR_SET_IRQ)
+- Get number of irqs of UINT (DFL_FPGA_PORT_UINT_GET_IRQ_NUM)
+- Set interrupt trigger for UINT (DFL_FPGA_PORT_UINT_SET_IRQ)

reset the FPGA Port and its AFU. Userspace can do Port
@@ -378,6 +384,17 @@ The device nodes used for ioctl() or mmap() can be referenced through::

+Interrupt support
+Some FME and AFU private features are able to generate interrupts. As mentioned
+above, users could call ioctl (DFL_FPGA_*_GET_IRQ_NUM) to know whether or how
+many interrupts are supported for this private feature. Drivers also implement
+an eventfd based interrupt handling mechanism for users to get notified when
+interrupt happens. Users could set eventfds to driver via
+ioctl (DFL_FPGA_*_SET_IRQ), and then poll/select on these eventfds waiting for
Add new FIUs support
It's possible that developers made some new function blocks (FIUs) under this
 \ /
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