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fpga: dfl: fme: add interrupt support for global error reporting

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Error reporting interrupt is very useful to notify users that some
errors are detected by the hardware. Once users are notified, they
could query hardware logged error states, no need to continuously
poll on these states.

This patch adds interrupt support for fme global error reporting sub
feature. It 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_FME_ERR_GET_IRQ_NUM
   get the number of irqs, which is used to determine whether/how many
   interrupts fme error reporting feature supports.

 * DFL_FPGA_FME_ERR_SET_IRQ
   set/unset given eventfds as fme error reporting interrupt triggers.

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>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
This commit is contained in:
Xu Yilun 2020-06-16 12:08:46 +08:00 • committed by Moritz Fischer
parent fe6a3d6521
commit d43f20bae5
3 changed files with 47 additions and 0 deletions
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23
include/uapi/linux/fpga-dfl.h
View file

@ -230,4 +230,27 @@ struct dfl_fpga_fme_port_pr {
*/
#define DFL_FPGA_FME_PORT_ASSIGN _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 2, int)
/**
* DFL_FPGA_FME_ERR_GET_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_FME_BASE + 3,
* __u32 num_irqs)
*
* Get the number of irqs supported by the fpga fme error reporting private
* feature. Currently hardware supports up to 1 irq.
* Return: 0 on success, -errno on failure.
*/
#define DFL_FPGA_FME_ERR_GET_IRQ_NUM _IOR(DFL_FPGA_MAGIC, \
DFL_FME_BASE + 3, __u32)
/**
* DFL_FPGA_FME_ERR_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 4,
* struct dfl_fpga_irq_set)
*
* Set fpga fme error reporting 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_FME_ERR_SET_IRQ _IOW(DFL_FPGA_MAGIC, \
DFL_FME_BASE + 4, \
struct dfl_fpga_irq_set)
#endif /* _UAPI_LINUX_FPGA_DFL_H */