s390/crypto: fix all kernel-doc warnings in vfio_ap_ops.c

The 0day bot reported some kernel-doc warnings in this file so clean up
all of the kernel-doc and use proper kernel-doc formatting.
There are no more kernel-doc errors or warnings reported in this file.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: Halil Pasic <pasic@linux.ibm.com>
Cc: Jason Herne <jjherne@linux.ibm.com>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: linux-s390@vger.kernel.org
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/r/20210806050149.9614-1-rdunlap@infradead.org
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

1 files changed, 52 insertions, 64 deletions

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 122c85c22469..67f145589f58 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -35,7 +35,7 @@ static int match_apqn(struct device *dev, const void *data)
 }
 
 /**
- * vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
+ * vfio_ap_get_queue - retrieve a queue with a specific APQN from a list
  * @matrix_mdev: the associated mediated matrix
  * @apqn: The queue APQN
  *
@@ -43,7 +43,7 @@ static int match_apqn(struct device *dev, const void *data)
  * devices of the vfio_ap_drv.
  * Verify that the APID and the APQI are set in the matrix.
  *
- * Returns the pointer to the associated vfio_ap_queue
+ * Return: the pointer to the associated vfio_ap_queue
  */
 static struct vfio_ap_queue *vfio_ap_get_queue(
 					struct ap_matrix_mdev *matrix_mdev,
@@ -64,7 +64,7 @@ static struct vfio_ap_queue *vfio_ap_get_queue(
 }
 
 /**
- * vfio_ap_wait_for_irqclear
+ * vfio_ap_wait_for_irqclear - clears the IR bit or gives up after 5 tries
  * @apqn: The AP Queue number
  *
  * Checks the IRQ bit for the status of this APQN using ap_tapq.
@@ -72,7 +72,6 @@ static struct vfio_ap_queue *vfio_ap_get_queue(
  * Returns if ap_tapq function failed with invalid, deconfigured or
  * checkstopped AP.
  * Otherwise retries up to 5 times after waiting 20ms.
- *
  */
 static void vfio_ap_wait_for_irqclear(int apqn)
 {
@@ -105,13 +104,12 @@ static void vfio_ap_wait_for_irqclear(int apqn)
 }
 
 /**
- * vfio_ap_free_aqic_resources
+ * vfio_ap_free_aqic_resources - free vfio_ap_queue resources
  * @q: The vfio_ap_queue
  *
  * Unregisters the ISC in the GIB when the saved ISC not invalid.
- * Unpin the guest's page holding the NIB when it exist.
- * Reset the saved_pfn and saved_isc to invalid values.
- *
+ * Unpins the guest's page holding the NIB when it exists.
+ * Resets the saved_pfn and saved_isc to invalid values.
  */
 static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
 {
@@ -130,7 +128,7 @@ static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
 }
 
 /**
- * vfio_ap_irq_disable
+ * vfio_ap_irq_disable - disables and clears an ap_queue interrupt
  * @q: The vfio_ap_queue
  *
  * Uses ap_aqic to disable the interruption and in case of success, reset
@@ -144,6 +142,8 @@ static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
  *
  * Returns if ap_aqic function failed with invalid, deconfigured or
  * checkstopped AP.
+ *
+ * Return: &struct ap_queue_status
  */
 static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
 {
@@ -183,9 +183,8 @@ end_free:
 }
 
 /**
- * vfio_ap_setirq: Enable Interruption for a APQN
+ * vfio_ap_irq_enable - Enable Interruption for a APQN
  *
- * @dev: the device associated with the ap_queue
  * @q:	 the vfio_ap_queue holding AQIC parameters
  *
  * Pin the NIB saved in *q
@@ -197,6 +196,8 @@ end_free:
  *
  * Otherwise return the ap_queue_status returned by the ap_aqic(),
  * all retry handling will be done by the guest.
+ *
+ * Return: &struct ap_queue_status
  */
 static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
 						 int isc,
@@ -253,7 +254,7 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
 }
 
 /**
- * handle_pqap: PQAP instruction callback
+ * handle_pqap - PQAP instruction callback
  *
  * @vcpu: The vcpu on which we received the PQAP instruction
  *
@@ -270,8 +271,8 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
  * We take the matrix_dev lock to ensure serialization on queues and
  * mediated device access.
  *
- * Return 0 if we could handle the request inside KVM.
- * otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
+ * Return: 0 if we could handle the request inside KVM.
+ * Otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
  */
 static int handle_pqap(struct kvm_vcpu *vcpu)
 {
@@ -426,7 +427,7 @@ struct vfio_ap_queue_reserved {
 };
 
 /**
- * vfio_ap_has_queue
+ * vfio_ap_has_queue - determines if the AP queue containing the target in @data
  *
  * @dev: an AP queue device
  * @data: a struct vfio_ap_queue_reserved reference
@@ -443,7 +444,7 @@ struct vfio_ap_queue_reserved {
  * - If @data contains only an apqi value, @data will be flagged as
  *   reserved if the APQI field in the AP queue device matches
  *
- * Returns 0 to indicate the input to function succeeded. Returns -EINVAL if
+ * Return: 0 to indicate the input to function succeeded. Returns -EINVAL if
  * @data does not contain either an apid or apqi.
  */
 static int vfio_ap_has_queue(struct device *dev, void *data)
@@ -473,9 +474,9 @@ static int vfio_ap_has_queue(struct device *dev, void *data)
 }
 
 /**
- * vfio_ap_verify_queue_reserved
+ * vfio_ap_verify_queue_reserved - verifies that the AP queue containing
+ * @apid or @aqpi is reserved
  *
- * @matrix_dev: a mediated matrix device
  * @apid: an AP adapter ID
  * @apqi: an AP queue index
  *
@@ -492,7 +493,7 @@ static int vfio_ap_has_queue(struct device *dev, void *data)
  * - If only @apqi is not NULL, then there must be an AP queue device bound
  *   to the vfio_ap driver with an APQN containing @apqi
  *
- * Returns 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
+ * Return: 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
  */
 static int vfio_ap_verify_queue_reserved(unsigned long *apid,
 					 unsigned long *apqi)
@@ -536,15 +537,15 @@ vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev,
 }
 
 /**
- * vfio_ap_mdev_verify_no_sharing
+ * vfio_ap_mdev_verify_no_sharing - verifies that the AP matrix is not configured
+ *
+ * @matrix_mdev: the mediated matrix device
  *
  * Verifies that the APQNs derived from the cross product of the AP adapter IDs
  * and AP queue indexes comprising the AP matrix are not configured for another
  * mediated device. AP queue sharing is not allowed.
  *
- * @matrix_mdev: the mediated matrix device
- *
- * Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE.
+ * Return: 0 if the APQNs are not shared; otherwise returns -EADDRINUSE.
  */
 static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
 {
@@ -578,7 +579,8 @@ static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
 }
 
 /**
- * assign_adapter_store
+ * assign_adapter_store - parses the APID from @buf and sets the
+ * corresponding bit in the mediated matrix device's APM
  *
  * @dev:	the matrix device
  * @attr:	the mediated matrix device's assign_adapter attribute
@@ -586,10 +588,7 @@ static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
  *		be assigned
  * @count:	the number of bytes in @buf
  *
- * Parses the APID from @buf and sets the corresponding bit in the mediated
- * matrix device's APM.
- *
- * Returns the number of bytes processed if the APID is valid; otherwise,
+ * Return: the number of bytes processed if the APID is valid; otherwise,
  * returns one of the following errors:
  *
  *	1. -EINVAL
@@ -666,17 +665,15 @@ done:
 static DEVICE_ATTR_WO(assign_adapter);
 
 /**
- * unassign_adapter_store
+ * unassign_adapter_store - parses the APID from @buf and clears the
+ * corresponding bit in the mediated matrix device's APM
  *
  * @dev:	the matrix device
  * @attr:	the mediated matrix device's unassign_adapter attribute
  * @buf:	a buffer containing the adapter number (APID) to be unassigned
  * @count:	the number of bytes in @buf
  *
- * Parses the APID from @buf and clears the corresponding bit in the mediated
- * matrix device's APM.
- *
- * Returns the number of bytes processed if the APID is valid; otherwise,
+ * Return: the number of bytes processed if the APID is valid; otherwise,
  * returns one of the following errors:
  *	-EINVAL if the APID is not a number
  *	-ENODEV if the APID it exceeds the maximum value configured for the
@@ -740,7 +737,9 @@ vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
 }
 
 /**
- * assign_domain_store
+ * assign_domain_store - parses the APQI from @buf and sets the
+ * corresponding bit in the mediated matrix device's AQM
+ *
  *
  * @dev:	the matrix device
  * @attr:	the mediated matrix device's assign_domain attribute
@@ -748,10 +747,7 @@ vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
  *		be assigned
  * @count:	the number of bytes in @buf
  *
- * Parses the APQI from @buf and sets the corresponding bit in the mediated
- * matrix device's AQM.
- *
- * Returns the number of bytes processed if the APQI is valid; otherwise returns
+ * Return: the number of bytes processed if the APQI is valid; otherwise returns
  * one of the following errors:
  *
  *	1. -EINVAL
@@ -824,7 +820,8 @@ static DEVICE_ATTR_WO(assign_domain);
 
 
 /**
- * unassign_domain_store
+ * unassign_domain_store - parses the APQI from @buf and clears the
+ * corresponding bit in the mediated matrix device's AQM
  *
  * @dev:	the matrix device
  * @attr:	the mediated matrix device's unassign_domain attribute
@@ -832,10 +829,7 @@ static DEVICE_ATTR_WO(assign_domain);
  *		be unassigned
  * @count:	the number of bytes in @buf
  *
- * Parses the APQI from @buf and clears the corresponding bit in the
- * mediated matrix device's AQM.
- *
- * Returns the number of bytes processed if the APQI is valid; otherwise,
+ * Return: the number of bytes processed if the APQI is valid; otherwise,
  * returns one of the following errors:
  *	-EINVAL if the APQI is not a number
  *	-ENODEV if the APQI exceeds the maximum value configured for the system
@@ -879,17 +873,16 @@ done:
 static DEVICE_ATTR_WO(unassign_domain);
 
 /**
- * assign_control_domain_store
+ * assign_control_domain_store - parses the domain ID from @buf and sets
+ * the corresponding bit in the mediated matrix device's ADM
+ *
  *
  * @dev:	the matrix device
  * @attr:	the mediated matrix device's assign_control_domain attribute
  * @buf:	a buffer containing the domain ID to be assigned
  * @count:	the number of bytes in @buf
  *
- * Parses the domain ID from @buf and sets the corresponding bit in the mediated
- * matrix device's ADM.
- *
- * Returns the number of bytes processed if the domain ID is valid; otherwise,
+ * Return: the number of bytes processed if the domain ID is valid; otherwise,
  * returns one of the following errors:
  *	-EINVAL if the ID is not a number
  *	-ENODEV if the ID exceeds the maximum value configured for the system
@@ -937,17 +930,15 @@ done:
 static DEVICE_ATTR_WO(assign_control_domain);
 
 /**
- * unassign_control_domain_store
+ * unassign_control_domain_store - parses the domain ID from @buf and
+ * clears the corresponding bit in the mediated matrix device's ADM
  *
  * @dev:	the matrix device
  * @attr:	the mediated matrix device's unassign_control_domain attribute
  * @buf:	a buffer containing the domain ID to be unassigned
  * @count:	the number of bytes in @buf
  *
- * Parses the domain ID from @buf and clears the corresponding bit in the
- * mediated matrix device's ADM.
- *
- * Returns the number of bytes processed if the domain ID is valid; otherwise,
+ * Return: the number of bytes processed if the domain ID is valid; otherwise,
  * returns one of the following errors:
  *	-EINVAL if the ID is not a number
  *	-ENODEV if the ID exceeds the maximum value configured for the system
@@ -1085,14 +1076,12 @@ static const struct attribute_group *vfio_ap_mdev_attr_groups[] = {
 };
 
 /**
- * vfio_ap_mdev_set_kvm
+ * vfio_ap_mdev_set_kvm - sets all data for @matrix_mdev that are needed
+ * to manage AP resources for the guest whose state is represented by @kvm
  *
  * @matrix_mdev: a mediated matrix device
  * @kvm: reference to KVM instance
  *
- * Sets all data for @matrix_mdev that are needed to manage AP resources
- * for the guest whose state is represented by @kvm.
- *
  * Note: The matrix_dev->lock must be taken prior to calling
  * this function; however, the lock will be temporarily released while the
  * guest's AP configuration is set to avoid a potential lockdep splat.
@@ -1100,7 +1089,7 @@ static const struct attribute_group *vfio_ap_mdev_attr_groups[] = {
  * certain circumstances, will result in a circular lock dependency if this is
  * done under the @matrix_mdev->lock.
  *
- * Return 0 if no other mediated matrix device has a reference to @kvm;
+ * Return: 0 if no other mediated matrix device has a reference to @kvm;
  * otherwise, returns an -EPERM.
  */
 static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
@@ -1131,8 +1120,8 @@ static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
 	return 0;
 }
 
-/*
- * vfio_ap_mdev_iommu_notifier: IOMMU notifier callback
+/**
+ * vfio_ap_mdev_iommu_notifier - IOMMU notifier callback
  *
  * @nb: The notifier block
  * @action: Action to be taken
@@ -1141,6 +1130,7 @@ static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
  * For an UNMAP request, unpin the guest IOVA (the NIB guest address we
  * pinned before). Other requests are ignored.
  *
+ * Return: for an UNMAP request, NOFITY_OK; otherwise NOTIFY_DONE.
  */
 static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
 				       unsigned long action, void *data)
@@ -1161,19 +1151,17 @@ static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
 }
 
 /**
- * vfio_ap_mdev_unset_kvm
+ * vfio_ap_mdev_unset_kvm - performs clean-up of resources no longer needed
+ * by @matrix_mdev.
  *
  * @matrix_mdev: a matrix mediated device
  *
- * Performs clean-up of resources no longer needed by @matrix_mdev.
- *
  * Note: The matrix_dev->lock must be taken prior to calling
  * this function; however, the lock will be temporarily released while the
  * guest's AP configuration is cleared to avoid a potential lockdep splat.
  * The kvm->lock is taken to clear the guest's AP configuration which, under
  * certain circumstances, will result in a circular lock dependency if this is
  * done under the @matrix_mdev->lock.
- *
  */
 static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
 {