From 09d86150141955ba1b3d7cbef23785f4996e4d6f Mon Sep 17 00:00:00 2001 From: Xu Yilun Date: Tue, 16 Jun 2020 12:08:47 +0800 Subject: [PATCH] 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 Signed-off-by: Wu Hao Signed-off-by: Xu Yilun Reviewed-by: Marcelo Tosatti Acked-by: Wu Hao Signed-off-by: Moritz Fischer --- 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 357cd5d9b267..7c84feea7354 100644 --- 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 b6495ea412ec..1621b077bf21 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 */ /**