[PATCH v9 10/19] vfio/platform: return IRQ info
From: Antonios Motakis
Date: Mon Oct 27 2014 - 14:09:52 EST
Return information for the interrupts exposed by the device.
This patch extends VFIO_DEVICE_GET_INFO with the number of IRQs
and enables VFIO_DEVICE_GET_IRQ_INFO.
Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/vfio/platform/Makefile | 2 +-
drivers/vfio/platform/vfio_platform_common.c | 31 ++++++++++++--
drivers/vfio/platform/vfio_platform_irq.c | 59 +++++++++++++++++++++++++++
drivers/vfio/platform/vfio_platform_private.h | 10 +++++
4 files changed, 97 insertions(+), 5 deletions(-)
create mode 100644 drivers/vfio/platform/vfio_platform_irq.c
diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
index 1957170..81de144 100644
--- a/drivers/vfio/platform/Makefile
+++ b/drivers/vfio/platform/Makefile
@@ -1,5 +1,5 @@
-vfio-platform-y := vfio_platform.o vfio_platform_common.o
+vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o
obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index aeaaec9..5f2c205 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -105,6 +105,7 @@ static void vfio_platform_release(void *device_data)
if (!(--vdev->refcnt)) {
vfio_platform_regions_cleanup(vdev);
+ vfio_platform_irq_cleanup(vdev);
}
mutex_unlock(&driver_lock);
@@ -126,6 +127,10 @@ static int vfio_platform_open(void *device_data)
ret = vfio_platform_regions_init(vdev);
if (ret)
goto err_reg;
+
+ ret = vfio_platform_irq_init(vdev);
+ if (ret)
+ goto err_irq;
}
vdev->refcnt++;
@@ -133,6 +138,8 @@ static int vfio_platform_open(void *device_data)
mutex_unlock(&driver_lock);
return 0;
+err_irq:
+ vfio_platform_regions_cleanup(vdev);
err_reg:
mutex_unlock(&driver_lock);
module_put(THIS_MODULE);
@@ -158,7 +165,7 @@ static long vfio_platform_ioctl(void *device_data,
info.flags = vdev->flags;
info.num_regions = vdev->num_regions;
- info.num_irqs = 0;
+ info.num_irqs = vdev->num_irqs;
return copy_to_user((void __user *)arg, &info, minsz);
@@ -183,10 +190,26 @@ static long vfio_platform_ioctl(void *device_data,
return copy_to_user((void __user *)arg, &info, minsz);
- } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO)
- return -EINVAL;
+ } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
+ 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 >= vdev->num_irqs)
+ return -EINVAL;
+
+ info.flags = vdev->irqs[info.index].flags;
+ info.count = vdev->irqs[info.index].count;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
- else if (cmd == VFIO_DEVICE_SET_IRQS)
+ } else if (cmd == VFIO_DEVICE_SET_IRQS)
return -EINVAL;
else if (cmd == VFIO_DEVICE_RESET)
diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
new file mode 100644
index 0000000..d99c71c
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -0,0 +1,59 @@
+/*
+ * VFIO platform devices interrupt handling
+ *
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/eventfd.h>
+#include <linux/interrupt.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+
+#include "vfio_platform_private.h"
+
+int vfio_platform_irq_init(struct vfio_platform_device *vdev)
+{
+ int cnt = 0, i;
+
+ while (vdev->get_irq(vdev, cnt) > 0)
+ cnt++;
+
+ vdev->irqs = kcalloc(cnt, sizeof(struct vfio_platform_irq), GFP_KERNEL);
+ if (!vdev->irqs)
+ return -ENOMEM;
+
+ for (i = 0; i < cnt; i++) {
+ vdev->irqs[i].flags = 0;
+ vdev->irqs[i].count = 1;
+ }
+
+ vdev->num_irqs = cnt;
+
+ return 0;
+}
+
+void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev)
+{
+ vdev->num_irqs = 0;
+ kfree(vdev->irqs);
+}
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 1f251b2..3a29a72 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -24,6 +24,11 @@
#define VFIO_PLATFORM_INDEX_TO_OFFSET(index) \
((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT)
+struct vfio_platform_irq {
+ u32 flags;
+ u32 count;
+};
+
struct vfio_platform_region {
u64 addr;
resource_size_t size;
@@ -37,6 +42,8 @@ struct vfio_platform_region {
struct vfio_platform_device {
struct vfio_platform_region *regions;
u32 num_regions;
+ struct vfio_platform_irq *irqs;
+ u32 num_irqs;
int refcnt;
/*
@@ -56,4 +63,7 @@ extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
extern struct vfio_platform_device *vfio_platform_remove_common
(struct device *dev);
+extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
+extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
+
#endif /* VFIO_PLATFORM_PRIVATE_H */
--
2.1.1
--
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