vfio: platform: add dev_info on device reset

It might be helpful for the end-user to check the device reset
function was found by the vfio platform reset framework.

Lets store a pointer to the struct device in vfio_platform_device
and trace when the reset function is called or not found.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

2 files changed, 13 insertions, 2 deletions

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index ac0229622c1f..a1c50d630792 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -144,8 +144,12 @@ static void vfio_platform_release(void *device_data)
         mutex_lock(&driver_lock);
 
         if (!(--vdev->refcnt)) {
-                if (vdev->reset)
+                if (vdev->reset) {
+                        dev_info(vdev->device, "reset\n");
                         vdev->reset(vdev);
+                } else {
+                        dev_warn(vdev->device, "no reset function found!\n");
+                }
                 vfio_platform_regions_cleanup(vdev);
                 vfio_platform_irq_cleanup(vdev);
         }
@@ -174,8 +178,12 @@ static int vfio_platform_open(void *device_data)
                 if (ret)
                         goto err_irq;
 
-                if (vdev->reset)
+                if (vdev->reset) {
+                        dev_info(vdev->device, "reset\n");
                         vdev->reset(vdev);
+                } else {
+                        dev_warn(vdev->device, "no reset function found!\n");
+                }
         }
 
         vdev->refcnt++;
@@ -551,6 +559,8 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev,
                 return -EINVAL;
         }
 
+        vdev->device = dev;
+
         group = iommu_group_get(dev);
         if (!group) {
                 pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index d1b0668fe394..42816dd280cb 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -59,6 +59,7 @@ struct vfio_platform_device {
         struct module                   *parent_module;
         const char                      *compat;
         struct module                   *reset_module;
+        struct device                   *device;
 
         /*
          * These fields should be filled by the bus specific binder