linux-kernel - [PATCH 7/7] Documentation: fpga: dfl: add descriptions for interrupt related interfaces.

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Message-Id: <1583749790-10837-8-git-send-email-yilun.xu@intel.com>
Date:   Mon,  9 Mar 2020 18:29:50 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Xu Yilun <yilun.xu@...el.com>, Luwei Kang <luwei.kang@...el.com>,
        Wu Hao <hao.wu@...el.com>
Subject: [PATCH 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 <luwei.kang@...el.com>
Signed-off-by: Wu Hao <hao.wu@...el.com>
Signed-off-by: Xu Yilun <yilun.xu@...el.com>
---
 Documentation/fpga/dfl.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
index 094fc8a..3c4e150 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 FME global error info (DFL_FPGA_FME_ERR_GET_INFO)
+- Set interrupt trigger for FME error (DFL_FPGA_FME_ERR_SET_IRQ)
 
 More functions are exposed through sysfs
 (/sys/class/fpga_region/regionX/dfl-fme.n/):
@@ -144,6 +146,10 @@ The following functions are exposed through ioctls:
 - Map DMA buffer (DFL_FPGA_PORT_DMA_MAP)
 - Unmap DMA buffer (DFL_FPGA_PORT_DMA_UNMAP)
 - Reset AFU (DFL_FPGA_PORT_RESET)
+- Get port error info (DFL_FPGA_PORT_ERR_GET_INFO)
+- Set interrupt trigger for port error(DFL_FPGA_PORT_ERR_SET_IRQ)
+- Get User AFU interrupt(UINT) info (DFL_FPGA_PORT_UINT_GET_INFO)
+- Set interrupt trigger for UINT (DFL_FPGA_PORT_UINT_SET_IRQ)
 
 DFL_FPGA_PORT_RESET:
   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::
 	/sys/class/fpga_region/<regionX>/<dfl-port.n>/dev
 
 
+Interrupt support
+=================
+Some FME and AFU private features are able to generate interrupts. As mentioned
+above, users could call ioctl (DFL_FPGA_*_GET_INFO), query the nr_irqs field 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
+notification.
+
+
 Add new FIUs support
 ====================
 It's possible that developers made some new function blocks (FIUs) under this
-- 
2.7.4