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Subject[PATCH v5 07/10] vfio/fsl-mc: Add irq infrastructure for fsl-mc devices
Date
This patch adds the skeleton for interrupt support
for fsl-mc devices. The interrupts are not yet functional,
the functionality will be added by subsequent patches.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
---
drivers/vfio/fsl-mc/Makefile | 2 +-
drivers/vfio/fsl-mc/vfio_fsl_mc.c | 52 ++++++++++++++++++++++-
drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c | 34 +++++++++++++++
drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 6 +++
4 files changed, 91 insertions(+), 3 deletions(-)
create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c

diff --git a/drivers/vfio/fsl-mc/Makefile b/drivers/vfio/fsl-mc/Makefile
index 0c6e5d2ddaae..cad6dbf0b735 100644
--- a/drivers/vfio/fsl-mc/Makefile
+++ b/drivers/vfio/fsl-mc/Makefile
@@ -1,4 +1,4 @@
# SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)

-vfio-fsl-mc-y := vfio_fsl_mc.o
+vfio-fsl-mc-y := vfio_fsl_mc.o vfio_fsl_mc_intr.o
obj-$(CONFIG_VFIO_FSL_MC) += vfio-fsl-mc.o
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 548fb4d80f3f..2919e2d0041b 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -217,11 +217,55 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
}
case VFIO_DEVICE_GET_IRQ_INFO:
{
- return -ENOTTY;
+ struct vfio_irq_info info;
+
+ minsz = offsetofend(struct vfio_irq_info, count);
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= mc_dev->obj_desc.irq_count)
+ return -EINVAL;
+
+ info.flags = VFIO_IRQ_INFO_EVENTFD;
+ info.count = 1;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
}
case VFIO_DEVICE_SET_IRQS:
{
- return -ENOTTY;
+ struct vfio_irq_set hdr;
+ u8 *data = NULL;
+ int ret = 0;
+ size_t data_size = 0;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ ret = vfio_set_irqs_validate_and_prepare(&hdr, mc_dev->obj_desc.irq_count,
+ mc_dev->obj_desc.irq_count, &data_size);
+ if (ret)
+ return ret;
+
+ if (data_size) {
+ data = memdup_user((void __user *)(arg + minsz),
+ data_size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ mutex_lock(&vdev->igate);
+ ret = vfio_fsl_mc_set_irqs_ioctl(vdev, hdr.flags,
+ hdr.index, hdr.start,
+ hdr.count, data);
+ mutex_unlock(&vdev->igate);
+ kfree(data);
+
+ return ret;
}
case VFIO_DEVICE_RESET:
{
@@ -422,6 +466,8 @@ static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
if (ret)
goto out_reflck;

+ mutex_init(&vdev->igate);
+
return 0;

out_reflck:
@@ -442,6 +488,8 @@ static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
if (!vdev)
return -EINVAL;

+ mutex_destroy(&vdev->igate);
+
vfio_fsl_mc_reflck_put(vdev->reflck);

if (is_fsl_mc_bus_dprc(mc_dev)) {
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
new file mode 100644
index 000000000000..5232f208e361
--- /dev/null
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2019 NXP
+ */
+
+#include <linux/vfio.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/eventfd.h>
+#include <linux/msi.h>
+
+#include "linux/fsl/mc.h"
+#include "vfio_fsl_mc_private.h"
+
+static int vfio_fsl_mc_set_irq_trigger(struct vfio_fsl_mc_device *vdev,
+ unsigned int index, unsigned int start,
+ unsigned int count, u32 flags,
+ void *data)
+{
+ return -EINVAL;
+}
+
+int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev,
+ u32 flags, unsigned int index,
+ unsigned int start, unsigned int count,
+ void *data)
+{
+ if (flags & VFIO_IRQ_SET_ACTION_TRIGGER)
+ return vfio_fsl_mc_set_irq_trigger(vdev, index, start,
+ count, flags, data);
+ else
+ return -EINVAL;
+}
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
index d47ef6215429..2c3f625a3240 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
@@ -33,6 +33,12 @@ struct vfio_fsl_mc_device {
int refcnt;
struct vfio_fsl_mc_region *regions;
struct vfio_fsl_mc_reflck *reflck;
+ struct mutex igate;
};

+extern int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev,
+ u32 flags, unsigned int index,
+ unsigned int start, unsigned int count,
+ void *data);
+
#endif /* VFIO_FSL_MC_PRIVATE_H */
--
2.17.1
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