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path: root/drivers/vfio/platform/vfio_platform_common.c
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Diffstat (limited to 'drivers/vfio/platform/vfio_platform_common.c')
-rw-r--r--drivers/vfio/platform/vfio_platform_common.c60
1 files changed, 57 insertions, 3 deletions
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index abcff7a1aa66..e43efb5e92bf 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -25,6 +25,44 @@
static DEFINE_MUTEX(driver_lock);
+static const struct vfio_platform_reset_combo reset_lookup_table[] = {
+ {
+ .compat = "calxeda,hb-xgmac",
+ .reset_function_name = "vfio_platform_calxedaxgmac_reset",
+ .module_name = "vfio-platform-calxedaxgmac",
+ },
+};
+
+static void vfio_platform_get_reset(struct vfio_platform_device *vdev,
+ struct device *dev)
+{
+ const char *compat;
+ int (*reset)(struct vfio_platform_device *);
+ int ret, i;
+
+ ret = device_property_read_string(dev, "compatible", &compat);
+ if (ret)
+ return;
+
+ for (i = 0 ; i < ARRAY_SIZE(reset_lookup_table); i++) {
+ if (!strcmp(reset_lookup_table[i].compat, compat)) {
+ request_module(reset_lookup_table[i].module_name);
+ reset = __symbol_get(
+ reset_lookup_table[i].reset_function_name);
+ if (reset) {
+ vdev->reset = reset;
+ return;
+ }
+ }
+ }
+}
+
+static void vfio_platform_put_reset(struct vfio_platform_device *vdev)
+{
+ if (vdev->reset)
+ symbol_put_addr(vdev->reset);
+}
+
static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
{
int cnt = 0, i;
@@ -100,6 +138,8 @@ 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);
}
@@ -127,6 +167,9 @@ static int vfio_platform_open(void *device_data)
ret = vfio_platform_irq_init(vdev);
if (ret)
goto err_irq;
+
+ if (vdev->reset)
+ vdev->reset(vdev);
}
vdev->refcnt++;
@@ -159,6 +202,8 @@ 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 +297,12 @@ 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 -EINVAL;
+ }
return -ENOTTY;
}
@@ -502,6 +551,8 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev,
return ret;
}
+ vfio_platform_get_reset(vdev, dev);
+
mutex_init(&vdev->igate);
return 0;
@@ -513,8 +564,11 @@ struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
struct vfio_platform_device *vdev;
vdev = vfio_del_group_dev(dev);
- if (vdev)
+
+ if (vdev) {
+ vfio_platform_put_reset(vdev);
iommu_group_put(dev->iommu_group);
+ }
return vdev;
}