Commit d43f20ba authored by Xu Yilun's avatar Xu Yilun Committed by Moritz Fischer
Browse files

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



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: default avatarLuwei Kang <luwei.kang@intel.com>
Signed-off-by: default avatarWu Hao <hao.wu@intel.com>
Signed-off-by: default avatarXu Yilun <yilun.xu@intel.com>
Reviewed-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Acked-by: default avatarWu Hao <hao.wu@intel.com>
Signed-off-by: default avatarMoritz Fischer <mdf@kernel.org>
parent fe6a3d65

drivers/fpga/dfl-fme-error.c

+18 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
 *   Mitchel, Henry <henry.mitchel@intel.com>

 */



#include <linux/fpga-dfl.h>

#include <linux/uaccess.h>



#include "dfl.h"
@@ -348,6 +349,22 @@ static void fme_global_err_uinit(struct platform_device *pdev, 
	fme_err_mask(&pdev->dev, true);

}



static long

fme_global_error_ioctl(struct platform_device *pdev,

		       struct dfl_feature *feature,

		       unsigned int cmd, unsigned long arg)

{

	switch (cmd) {

	case DFL_FPGA_FME_ERR_GET_IRQ_NUM:

		return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);

	case DFL_FPGA_FME_ERR_SET_IRQ:

		return dfl_feature_ioctl_set_irq(pdev, feature, arg);

	default:

		dev_dbg(&pdev->dev, "%x cmd not handled", cmd);

		return -ENODEV;

	}

}



const struct dfl_feature_id fme_global_err_id_table[] = {

	{.id = FME_FEATURE_ID_GLOBAL_ERR,},

	{0,}
@@ -356,4 +373,5 @@ const struct dfl_feature_id fme_global_err_id_table[] = { 
const struct dfl_feature_ops fme_global_err_ops = {

	.init = fme_global_err_init,

	.uinit = fme_global_err_uinit,

	.ioctl = fme_global_error_ioctl,

};

drivers/fpga/dfl-fme-main.c

+6 −0
Original line number Diff line number Diff line
@@ -620,11 +620,17 @@ static int fme_release(struct inode *inode, struct file *filp) 
{

	struct dfl_feature_platform_data *pdata = filp->private_data;

	struct platform_device *pdev = pdata->dev;

	struct dfl_feature *feature;



	dev_dbg(&pdev->dev, "Device File Release\n");



	mutex_lock(&pdata->lock);

	dfl_feature_dev_use_end(pdata);



	if (!dfl_feature_dev_use_count(pdata))

		dfl_fpga_dev_for_each_feature(pdata, feature)

			dfl_fpga_set_irq_triggers(feature, 0,

						  feature->nr_irqs, NULL);

	mutex_unlock(&pdata->lock);



	return 0;

include/uapi/linux/fpga-dfl.h

+23 −0
Original line number Diff line number Diff line
@@ -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 */

CRA Git | Maintained and supported by SUSTech CRA and CCSE