[PATCH 7/9] vfio/fsl-mc: Add irq infrastructure for fsl-mc devices

[Diana Craciun]

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@xxxxxxx>
Signed-off-by: Diana Craciun <diana.craciun@xxxxxxxxxxx>
---
 drivers/vfio/fsl-mc/Makefile              |  6 +-
 drivers/vfio/fsl-mc/vfio_fsl_mc.c         | 71 ++++++++++++++++++++++-
 drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c    | 63 ++++++++++++++++++++
 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h |  5 ++
 4 files changed, 141 insertions(+), 4 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 6f2b80645d5b..cad6dbf0b735 100644
--- a/drivers/vfio/fsl-mc/Makefile
+++ b/drivers/vfio/fsl-mc/Makefile
@@ -1,2 +1,4 @@
-vfio-fsl_mc-y := vfio_fsl_mc.o
-obj-$(CONFIG_VFIO_FSL_MC) += vfio_fsl_mc.o
+# SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+
+vfio-fsl-mc-y := vfio_fsl_mc.o vfio_fsl_mc_intr.o
+obj-$(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 ea5e81e7791c..4d7baee2e474 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -210,11 +210,75 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
 	}
 	case VFIO_DEVICE_GET_IRQ_INFO:
 	{
-		return -EINVAL;
+		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 -EINVAL;
+		struct vfio_irq_set hdr;
+		u8 *data = NULL;
+		int ret = 0;
+
+		minsz = offsetofend(struct vfio_irq_set, count);
+
+		if (copy_from_user(&hdr, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (hdr.argsz < minsz)
+			return -EINVAL;
+
+		if (hdr.index >= mc_dev->obj_desc.irq_count)
+			return -EINVAL;
+
+		if (hdr.start != 0 || hdr.count > 1)
+			return -EINVAL;
+
+		if (hdr.count == 0 &&
+		    (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE) ||
+		    !(hdr.flags & VFIO_IRQ_SET_ACTION_TRIGGER)))
+			return -EINVAL;
+
+		if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
+				  VFIO_IRQ_SET_ACTION_TYPE_MASK))
+			return -EINVAL;
+
+		if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
+			size_t size;
+
+			if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
+				size = sizeof(uint8_t);
+			else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
+				size = sizeof(int32_t);
+			else
+				return -EINVAL;
+
+			if (hdr.argsz - minsz < hdr.count * size)
+				return -EINVAL;
+
+			data = memdup_user((void __user *)(arg + minsz),
+					   hdr.count * size);
+			if (IS_ERR(data))
+				return PTR_ERR(data);
+		}
+
+		ret = vfio_fsl_mc_set_irqs_ioctl(vdev, hdr.flags,
+						 hdr.index, hdr.start,
+						 hdr.count, data);
+		return ret;
 	}
 	case VFIO_DEVICE_RESET:
 	{
@@ -303,6 +367,9 @@ static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev)
 	struct fsl_mc_device *mc_dev = vdev->mc_dev;
 	int ret = 0;
 
+	/* innherit the msi domain from parent */
+	dev_set_msi_domain(&mc_dev->dev, dev_get_msi_domain(mc_dev->dev.parent));
+
 	/* Non-dprc devices share mc_io from parent */
 	if (!is_fsl_mc_bus_dprc(mc_dev)) {
 		struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
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..058aa97aa54a
--- /dev/null
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
@@ -0,0 +1,63 @@
+// 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_irq_mask(struct vfio_fsl_mc_device *vdev,
+				unsigned int index, unsigned int start,
+				unsigned int count, u32 flags,
+				void *data)
+{
+	return -EINVAL;
+}
+
+static int vfio_fsl_mc_irq_unmask(struct vfio_fsl_mc_device *vdev,
+				unsigned int index, unsigned int start,
+				unsigned int count, u32 flags,
+				void *data)
+{
+	return -EINVAL;
+}
+
+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)
+{
+	int ret = -ENOTTY;
+
+	switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+	case VFIO_IRQ_SET_ACTION_MASK:
+		ret = vfio_fsl_mc_irq_mask(vdev, index, start, count,
+					   flags, data);
+		break;
+	case VFIO_IRQ_SET_ACTION_UNMASK:
+		ret = vfio_fsl_mc_irq_unmask(vdev, index, start, count,
+					     flags, data);
+		break;
+	case VFIO_IRQ_SET_ACTION_TRIGGER:
+		ret = vfio_fsl_mc_set_irq_trigger(vdev, index, start,
+						  count, flags, data);
+		break;
+	}
+
+	return ret;
+}
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
index d072cccd93e0..0c7506e43880 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
@@ -37,4 +37,9 @@ struct vfio_fsl_mc_device {
 	struct vfio_fsl_mc_reflck   *reflck;
 };
 
+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_PCI_PRIVATE_H */
-- 
2.17.1