NULL,
};
-struct vfio_ap_queue_reserved {
- unsigned long *apid;
- unsigned long *apqi;
- bool reserved;
-};
+#define MDEV_SHARING_ERR "Userspace may not re-assign queue %02lx.%04lx " \
+ "already assigned to %s"
-/**
- * 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
- *
- * Flags whether the AP queue device (@dev) has a queue ID containing the APQN,
- * apid or apqi specified in @data:
- *
- * - If @data contains both an apid and apqi value, then @data will be flagged
- * as reserved if the APID and APQI fields for the AP queue device matches
- *
- * - If @data contains only an apid value, @data will be flagged as
- * reserved if the APID field in the AP queue device matches
- *
- * - If @data contains only an apqi value, @data will be flagged as
- * reserved if the APQI field in the AP queue device matches
- *
- * 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)
+static void vfio_ap_mdev_log_sharing_err(struct ap_matrix_mdev *matrix_mdev,
+ unsigned long *apm,
+ unsigned long *aqm)
{
- struct vfio_ap_queue_reserved *qres = data;
- struct ap_queue *ap_queue = to_ap_queue(dev);
- ap_qid_t qid;
- unsigned long id;
-
- if (qres->apid && qres->apqi) {
- qid = AP_MKQID(*qres->apid, *qres->apqi);
- if (qid == ap_queue->qid)
- qres->reserved = true;
- } else if (qres->apid && !qres->apqi) {
- id = AP_QID_CARD(ap_queue->qid);
- if (id == *qres->apid)
- qres->reserved = true;
- } else if (!qres->apid && qres->apqi) {
- id = AP_QID_QUEUE(ap_queue->qid);
- if (id == *qres->apqi)
- qres->reserved = true;
- } else {
- return -EINVAL;
- }
-
- return 0;
-}
-
-/**
- * vfio_ap_verify_queue_reserved - verifies that the AP queue containing
- * @apid or @aqpi is reserved
- *
- * @apid: an AP adapter ID
- * @apqi: an AP queue index
- *
- * Verifies that the AP queue with @apid/@apqi is reserved by the VFIO AP device
- * driver according to the following rules:
- *
- * - If both @apid and @apqi are not NULL, then there must be an AP queue
- * device bound to the vfio_ap driver with the APQN identified by @apid and
- * @apqi
- *
- * - If only @apid is not NULL, then there must be an AP queue device bound
- * to the vfio_ap driver with an APQN containing @apid
- *
- * - 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
- *
- * Return: 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
- */
-static int vfio_ap_verify_queue_reserved(unsigned long *apid,
- unsigned long *apqi)
-{
- int ret;
- struct vfio_ap_queue_reserved qres;
-
- qres.apid = apid;
- qres.apqi = apqi;
- qres.reserved = false;
-
- ret = driver_for_each_device(&matrix_dev->vfio_ap_drv->driver, NULL,
- &qres, vfio_ap_has_queue);
- if (ret)
- return ret;
-
- if (qres.reserved)
- return 0;
-
- return -EADDRNOTAVAIL;
-}
-
-static int
-vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev,
- unsigned long apid)
-{
- int ret;
- unsigned long apqi;
- unsigned long nbits = matrix_mdev->matrix.aqm_max + 1;
-
- if (find_first_bit_inv(matrix_mdev->matrix.aqm, nbits) >= nbits)
- return vfio_ap_verify_queue_reserved(&apid, NULL);
-
- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, nbits) {
- ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
- if (ret)
- return ret;
- }
+ unsigned long apid, apqi;
+ const struct device *dev = mdev_dev(matrix_mdev->mdev);
+ const char *mdev_name = dev_name(dev);
- return 0;
+ for_each_set_bit_inv(apid, apm, AP_DEVICES)
+ for_each_set_bit_inv(apqi, aqm, AP_DOMAINS)
+ dev_warn(dev, MDEV_SHARING_ERR, apid, apqi, mdev_name);
}
/**
- * vfio_ap_mdev_verify_no_sharing - verifies that the AP matrix is not configured
+ * vfio_ap_mdev_verify_no_sharing - verify APQNs are not shared by matrix mdevs
*
- * @matrix_mdev: the mediated matrix device
+ * @mdev_apm: mask indicating the APIDs of the APQNs to be verified
+ * @mdev_aqm: mask indicating the APQIs of the APQNs to be verified
*
- * 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
+ * Verifies that each APQN derived from the Cartesian product of a bitmap of
+ * AP adapter IDs and AP queue indexes is not configured for any matrix
* mediated device. AP queue sharing is not allowed.
*
- * Return: 0 if the APQNs are not shared; otherwise returns -EADDRINUSE.
+ * Return: 0 if the APQNs are not shared; otherwise return -EADDRINUSE.
*/
-static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
+static int vfio_ap_mdev_verify_no_sharing(unsigned long *mdev_apm,
+ unsigned long *mdev_aqm)
{
- struct ap_matrix_mdev *lstdev;
+ struct ap_matrix_mdev *matrix_mdev;
DECLARE_BITMAP(apm, AP_DEVICES);
DECLARE_BITMAP(aqm, AP_DOMAINS);
- list_for_each_entry(lstdev, &matrix_dev->mdev_list, node) {
- if (matrix_mdev == lstdev)
+ list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) {
+ /*
+ * If the input apm and aqm are fields of the matrix_mdev
+ * object, then move on to the next matrix_mdev.
+ */
+ if (mdev_apm == matrix_mdev->matrix.apm &&
+ mdev_aqm == matrix_mdev->matrix.aqm)
continue;
memset(apm, 0, sizeof(apm));
* We work on full longs, as we can only exclude the leftover
* bits in non-inverse order. The leftover is all zeros.
*/
- if (!bitmap_and(apm, matrix_mdev->matrix.apm,
- lstdev->matrix.apm, AP_DEVICES))
+ if (!bitmap_and(apm, mdev_apm, matrix_mdev->matrix.apm,
+ AP_DEVICES))
continue;
- if (!bitmap_and(aqm, matrix_mdev->matrix.aqm,
- lstdev->matrix.aqm, AP_DOMAINS))
+ if (!bitmap_and(aqm, mdev_aqm, matrix_mdev->matrix.aqm,
+ AP_DOMAINS))
continue;
+ vfio_ap_mdev_log_sharing_err(matrix_mdev, apm, aqm);
+
return -EADDRINUSE;
}
return 0;
}
+static int vfio_ap_mdev_validate_masks(struct ap_matrix_mdev *matrix_mdev)
+{
+ if (ap_apqn_in_matrix_owned_by_def_drv(matrix_mdev->matrix.apm,
+ matrix_mdev->matrix.aqm))
+ return -EADDRNOTAVAIL;
+
+ return vfio_ap_mdev_verify_no_sharing(matrix_mdev->matrix.apm,
+ matrix_mdev->matrix.aqm);
+}
+
static void vfio_ap_mdev_link_adapter(struct ap_matrix_mdev *matrix_mdev,
unsigned long apid)
{
goto done;
}
- /*
- * Set the bit in the AP mask (APM) corresponding to the AP adapter
- * number (APID). The bits in the mask, from most significant to least
- * significant bit, correspond to APIDs 0-255.
- */
- ret = vfio_ap_mdev_verify_queues_reserved_for_apid(matrix_mdev, apid);
- if (ret)
- goto done;
-
set_bit_inv(apid, matrix_mdev->matrix.apm);
- ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
- if (ret)
- goto share_err;
+ ret = vfio_ap_mdev_validate_masks(matrix_mdev);
+ if (ret) {
+ clear_bit_inv(apid, matrix_mdev->matrix.apm);
+ goto done;
+ }
vfio_ap_mdev_link_adapter(matrix_mdev, apid);
memset(apm_delta, 0, sizeof(apm_delta));
vfio_ap_mdev_filter_matrix(apm_delta,
matrix_mdev->matrix.aqm, matrix_mdev);
ret = count;
- goto done;
-
-share_err:
- clear_bit_inv(apid, matrix_mdev->matrix.apm);
done:
mutex_unlock(&matrix_dev->lock);
}
static DEVICE_ATTR_WO(unassign_adapter);
-static int
-vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
- unsigned long apqi)
-{
- int ret;
- unsigned long apid;
- unsigned long nbits = matrix_mdev->matrix.apm_max + 1;
-
- if (find_first_bit_inv(matrix_mdev->matrix.apm, nbits) >= nbits)
- return vfio_ap_verify_queue_reserved(NULL, &apqi);
-
- for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, nbits) {
- ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
static void vfio_ap_mdev_link_domain(struct ap_matrix_mdev *matrix_mdev,
unsigned long apqi)
{
goto done;
}
- ret = vfio_ap_mdev_verify_queues_reserved_for_apqi(matrix_mdev, apqi);
- if (ret)
- goto done;
-
set_bit_inv(apqi, matrix_mdev->matrix.aqm);
- ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
- if (ret)
- goto share_err;
+ ret = vfio_ap_mdev_validate_masks(matrix_mdev);
+ if (ret) {
+ clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
+ goto done;
+ }
vfio_ap_mdev_link_domain(matrix_mdev, apqi);
memset(aqm_delta, 0, sizeof(aqm_delta));
vfio_ap_mdev_filter_matrix(matrix_mdev->matrix.apm, aqm_delta,
matrix_mdev);
ret = count;
- goto done;
-
-share_err:
- clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
done:
mutex_unlock(&matrix_dev->lock);
projects / kernel.git / commitdiff