lkml.org 
[lkml]   [2015]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC 1/3] VFIO: platform: add reset support
Date
This patch adds support for vfio platform reset. The modality only is
exposed when a specialized VFIO driver populates the reset callback.
For the generic vfio platform/amba driver, the modality is not supported
since the driver is by essence a metadriver and does not know how to
reset the underlying device.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
drivers/vfio/platform/vfio_platform_common.c | 12 ++++++++++--
drivers/vfio/platform/vfio_platform_private.h | 1 +
2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 4113d46..b989ce5 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -100,6 +100,8 @@ static void vfio_platform_release(void *device_data)
mutex_lock(&driver_lock);

if (!(--vdev->refcnt)) {
+ if (vdev->reset)
+ vdev->reset(vdev);
vfio_platform_regions_cleanup(vdev);
vfio_platform_irq_cleanup(vdev);
}
@@ -159,6 +161,8 @@ static long vfio_platform_ioctl(void *device_data,
if (info.argsz < minsz)
return -EINVAL;

+ if (vdev->reset)
+ vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
info.flags = vdev->flags;
info.num_regions = vdev->num_regions;
info.num_irqs = vdev->num_irqs;
@@ -252,8 +256,12 @@ static long vfio_platform_ioctl(void *device_data,

return ret;

- } else if (cmd == VFIO_DEVICE_RESET)
- return -EINVAL;
+ } else if (cmd == VFIO_DEVICE_RESET) {
+ if (vdev->reset)
+ return vdev->reset(vdev);
+ else
+ return -ENOTTY;
+ }

return -ENOTTY;
}
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 253caa3..0a20028 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -68,6 +68,7 @@ struct vfio_platform_device {
struct resource*
(*get_resource)(struct vfio_platform_device *vdev, int i);
int (*get_irq)(struct vfio_platform_device *vdev, int i);
+ int (*reset)(struct vfio_platform_device *vdev);
};

extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
--
1.9.1


\
 
 \ /
  Last update: 2015-04-17 16:01    [W:0.073 / U:14.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site