diff options
| author | Xu Yilun <yilun.xu@intel.com> | 2020-06-16 07:08:44 +0300 |
|---|---|---|
| committer | Moritz Fischer <mdf@kernel.org> | 2020-06-28 22:43:16 +0300 |
| commit | 322b598be4d9b9090cda560c4caab78704615ab4 (patch) | |
| tree | 283e567dd6d5f36250dee984614ab15897d78655 /drivers/fpga/dfl.h | |
| parent | bfef946dbe1bbe6cae97bba27594e8d5b0e01ffa (diff) | |
| download | linux-322b598be4d9b9090cda560c4caab78704615ab4.tar.xz | |
fpga: dfl: introduce interrupt trigger setting API
FPGA user applications may be interested in interrupts generated by
DFL features. For example, users can implement their own FPGA
logics with interrupts enabled in AFU (Accelerated Function Unit,
dynamic region of DFL based FPGA). So user applications need to be
notified to handle these interrupts.
In order to allow userspace applications to monitor interrupts,
driver requires userspace to provide eventfds as interrupt
notification channels. Applications then poll/select on the eventfds
to get notified.
This patch introduces a generic helper functions to do eventfds binding
with given interrupts.
Sub feature drivers are expected to use XXX_GET_IRQ_NUM to query irq
info, and XXX_SET_IRQ to set eventfds for interrupts. This patch also
introduces helper functions for these 2 ioctls.
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Diffstat (limited to 'drivers/fpga/dfl.h')
| -rw-r--r-- | drivers/fpga/dfl.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h index e1f3ab86560e..a32dfba2a88b 100644 --- a/drivers/fpga/dfl.h +++ b/drivers/fpga/dfl.h @@ -17,6 +17,7 @@ #include <linux/bitfield.h> #include <linux/cdev.h> #include <linux/delay.h> +#include <linux/eventfd.h> #include <linux/fs.h> #include <linux/interrupt.h> #include <linux/iopoll.h> @@ -214,14 +215,19 @@ struct dfl_feature_driver { * struct dfl_feature_irq_ctx - dfl private feature interrupt context * * @irq: Linux IRQ number of this interrupt. + * @trigger: eventfd context to signal when interrupt happens. + * @name: irq name needed when requesting irq. */ struct dfl_feature_irq_ctx { int irq; + struct eventfd_ctx *trigger; + char *name; }; /** * struct dfl_feature - sub feature of the feature devices * + * @dev: ptr to pdev of the feature device which has the sub feature. * @id: sub feature id. * @resource_index: each sub feature has one mmio resource for its registers. * this index is used to find its mmio resource from the @@ -233,6 +239,7 @@ struct dfl_feature_irq_ctx { * @priv: priv data of this feature. */ struct dfl_feature { + struct platform_device *dev; u64 id; int resource_index; void __iomem *ioaddr; @@ -503,4 +510,13 @@ int dfl_fpga_cdev_release_port(struct dfl_fpga_cdev *cdev, int port_id); int dfl_fpga_cdev_assign_port(struct dfl_fpga_cdev *cdev, int port_id); void dfl_fpga_cdev_config_ports_pf(struct dfl_fpga_cdev *cdev); int dfl_fpga_cdev_config_ports_vf(struct dfl_fpga_cdev *cdev, int num_vf); +int dfl_fpga_set_irq_triggers(struct dfl_feature *feature, unsigned int start, + unsigned int count, int32_t *fds); +long dfl_feature_ioctl_get_num_irqs(struct platform_device *pdev, + struct dfl_feature *feature, + unsigned long arg); +long dfl_feature_ioctl_set_irq(struct platform_device *pdev, + struct dfl_feature *feature, + unsigned long arg); + #endif /* __FPGA_DFL_H */ |