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Subject[PATCH v5 2/7] s390: ap: new vfio_ap_queue structure
Date
The AP interruptions are assigned on a queue basis and
the GISA structure is handled on a VM basis, so that
we need to add a structure we can retrieve from both side
holding the information we need to handle PQAP/AQIC interception
and setup the GISA.

Since we can not add more information to the ap_device
we add a new structure vfio_ap_queue, to hold per queue
information useful to handle interruptions and set it as
driver's data of the standard ap_queue device.

Usually, the device and the mediated device are linked together
but in the vfio_ap driver design we have a bunch of "sub" devices
(the ap_queue devices) belonging to the mediated device.

Linking these structure to the mediated device it is assigned to,
with the help of the vfio_ap_queue structure will help us to
retrieve the AP devices associated with the mediated devices
during the mediated device operations.

------------ -------------
| AP queue |--> | AP_vfio_q |<----
------------ ------^------ | ---------------
| <--->| matrix_mdev |
------------ ------v------ | ---------------
| AP queue |--> | AP_vfio_q |-----
------------ -------------

The vfio_ap_queue device will hold the following entries:
- apqn: AP queue number (defined here)
- isc : Interrupt subclass (defined later)
- nib : notification information byte (defined later)
- list: a list_head entry allowing to link this structure to a
matrix mediated device it is assigned to.

The vfio_ap_queue structure is allocated when the vfio_ap_driver
is probed and added as driver data to the ap_queue device.
It is free on remove.

The structure is linked to the matrix_dev host device at the
probe of the device building some kind of free list for the
matrix mediated devices.

When the vfio_queue is associated to a matrix mediated device,
during assign_adapter or assign_domain,
the vfio_ap_queue device is linked to this matrix mediated device
and unlinked when dissociated.

Queuing the devices on a list of free devices and testing the
matrix_mdev pointer to the associated matrix allow us to know
if the queue is associated to the matrix device and associated
or not to a mediated device.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_drv.c | 31 ++-
drivers/s390/crypto/vfio_ap_ops.c | 390 +++++++++++++++++-----------------
drivers/s390/crypto/vfio_ap_private.h | 7 +
3 files changed, 234 insertions(+), 194 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
index e9824c3..df6f21a 100644
--- a/drivers/s390/crypto/vfio_ap_drv.c
+++ b/drivers/s390/crypto/vfio_ap_drv.c
@@ -40,14 +40,42 @@ static struct ap_device_id ap_queue_ids[] = {

MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);

+/**
+ * vfio_ap_queue_dev_probe:
+ *
+ * Allocate a vfio_ap_queue structure and associate it
+ * with the device as driver_data.
+ */
static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
{
+ struct vfio_ap_queue *q;
+
+ q = kzalloc(sizeof(*q), GFP_KERNEL);
+ if (!q)
+ return -ENOMEM;
+ dev_set_drvdata(&apdev->device, q);
+ q->apqn = to_ap_queue(&apdev->device)->qid;
+ INIT_LIST_HEAD(&q->list);
+ mutex_lock(&matrix_dev->lock);
+ list_add(&q->list, &matrix_dev->free_list);
+ mutex_unlock(&matrix_dev->lock);
return 0;
}

+/**
+ * vfio_ap_queue_dev_remove:
+ *
+ * Free the associated vfio_ap_queue structure
+ */
static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
{
- /* Nothing to do yet */
+ struct vfio_ap_queue *q;
+
+ q = dev_get_drvdata(&apdev->device);
+ mutex_lock(&matrix_dev->lock);
+ list_del(&q->list);
+ mutex_unlock(&matrix_dev->lock);
+ kfree(q);
}

static void vfio_ap_matrix_dev_release(struct device *dev)
@@ -107,6 +135,7 @@ static int vfio_ap_matrix_dev_create(void)
matrix_dev->device.bus = &matrix_bus;
matrix_dev->device.release = vfio_ap_matrix_dev_release;
matrix_dev->vfio_ap_drv = &vfio_ap_drv;
+ INIT_LIST_HEAD(&matrix_dev->free_list);

ret = device_register(&matrix_dev->device);
if (ret)
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 900b9cf..485595c 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -24,6 +24,48 @@
#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
#define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"

+/**
+ * vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
+ * @apqn: The queue APQN
+ *
+ * Retrieve a queue with a specific APQN from the list of the
+ * devices associated with a list.
+ *
+ * Returns the pointer to the associated vfio_ap_queue
+ */
+struct vfio_ap_queue *vfio_ap_get_queue(int apqn, struct list_head *l)
+{
+ struct vfio_ap_queue *q;
+
+ list_for_each_entry(q, l, list)
+ if (q->apqn == apqn)
+ return q;
+ return NULL;
+}
+
+static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q)
+{
+ struct ap_queue_status status;
+ int retry = 1;
+
+ do {
+ status = ap_zapq(q->apqn);
+ switch (status.response_code) {
+ case AP_RESPONSE_NORMAL:
+ return 0;
+ case AP_RESPONSE_RESET_IN_PROGRESS:
+ case AP_RESPONSE_BUSY:
+ msleep(20);
+ break;
+ default:
+ /* things are really broken, give up */
+ return -EIO;
+ }
+ } while (retry--);
+
+ return -EBUSY;
+}
+
static void vfio_ap_matrix_init(struct ap_config_info *info,
struct ap_matrix *matrix)
{
@@ -45,6 +87,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
return -ENOMEM;
}

+ INIT_LIST_HEAD(&matrix_mdev->qlist);
vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
mdev_set_drvdata(mdev, matrix_mdev);
mutex_lock(&matrix_dev->lock);
@@ -113,162 +156,178 @@ static struct attribute_group *vfio_ap_mdev_type_groups[] = {
NULL,
};

-struct vfio_ap_queue_reserved {
- unsigned long *apid;
- unsigned long *apqi;
- bool reserved;
-};
+static void vfio_ap_free_queue(int apqn, struct ap_matrix_mdev *matrix_mdev)
+{
+ struct vfio_ap_queue *q;
+
+ q = vfio_ap_get_queue(apqn, &matrix_mdev->qlist);
+ if (!q)
+ return;
+ q->matrix_mdev = NULL;
+ vfio_ap_mdev_reset_queue(q);
+ list_move(&q->list, &matrix_dev->free_list);
+}

/**
- * vfio_ap_has_queue
- *
- * @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
+ * vfio_ap_put_all_domains:
*
- * - If @data contains only an apid value, @data will be flagged as
- * reserved if the APID field in the AP queue device matches
+ * @matrix_mdev: the matrix mediated device for which we want to associate
+ * all available queues with a given apqi.
+ * @apid: The apid which associated with all defined APQI of the
+ * mediated device will define a AP queue.
*
- * - 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
- * @data does not contain either an apid or apqi.
+ * We remove the queue from the list of queues associated with the
+ * mediated device and put them back to the free list of the matrix
+ * device and clear the matrix_mdev pointer.
*/
-static int vfio_ap_has_queue(struct device *dev, void *data)
+static void vfio_ap_put_all_domains(struct ap_matrix_mdev *matrix_mdev,
+ int apid)
{
- struct vfio_ap_queue_reserved *qres = data;
- struct ap_queue *ap_queue = to_ap_queue(dev);
- ap_qid_t qid;
- unsigned long id;
+ int apqi, apqn;

- 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;
+ for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, AP_DOMAINS) {
+ apqn = AP_MKQID(apid, apqi);
+ vfio_ap_free_queue(apqn, matrix_mdev);
}
-
- return 0;
}

/**
- * vfio_ap_verify_queue_reserved
- *
- * @matrix_dev: a mediated matrix device
- * @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
+ * vfio_ap_put_all_cards:
*
- * - 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
+ * @matrix_mdev: the matrix mediated device for which we want to associate
+ * all available queues with a given apqi.
+ * @apqi: The apqi which associated with all defined APID of the
+ * mediated device will define a AP queue.
*
- * - 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.
+ * We remove the queue from the list of queues associated with the
+ * mediated device and put them back to the free list of the matrix
+ * device and clear the matrix_mdev pointer.
*/
-static int vfio_ap_verify_queue_reserved(unsigned long *apid,
- unsigned long *apqi)
+static void vfio_ap_put_all_cards(struct ap_matrix_mdev *matrix_mdev, int apqi)
{
- int ret;
- struct vfio_ap_queue_reserved qres;
+ int apid, apqn;
+
+ for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) {
+ apqn = AP_MKQID(apid, apqi);
+ vfio_ap_free_queue(apqn, matrix_mdev);
+ }
+}

- qres.apid = apid;
- qres.apqi = apqi;
- qres.reserved = false;
+static void move_and_set(struct list_head *src, struct list_head *dst,
+ struct ap_matrix_mdev *matrix_mdev)
+{
+ struct vfio_ap_queue *q, *qtmp;

- ret = driver_for_each_device(&matrix_dev->vfio_ap_drv->driver, NULL,
- &qres, vfio_ap_has_queue);
- if (ret)
- return ret;
+ list_for_each_entry_safe(q, qtmp, src, list) {
+ list_move(&q->list, dst);
+ q->matrix_mdev = matrix_mdev;
+ }
+}

- if (qres.reserved)
- return 0;
+static int vfio_ap_queue_match(struct device *dev, void *data)
+{
+ struct ap_queue *ap;

- return -EADDRNOTAVAIL;
+ ap = to_ap_queue(dev);
+ return ap->qid == *(int *)data;
}

-static int
-vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev,
- unsigned long apid)
+static struct vfio_ap_queue *vfio_ap_find_queue(int apqn)
{
- int ret;
- unsigned long apqi;
- unsigned long nbits = matrix_mdev->matrix.aqm_max + 1;
+ struct device *dev;

- if (find_first_bit_inv(matrix_mdev->matrix.aqm, nbits) >= nbits)
- return vfio_ap_verify_queue_reserved(&apid, NULL);
+ dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
+ &apqn, vfio_ap_queue_match);
+ return dev ? dev_get_drvdata(dev) : NULL;
+}

- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, nbits) {
- ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
- if (ret)
- return ret;
+/**
+ * vfio_ap_get_all_domains:
+ *
+ * @matrix_mdev: the matrix mediated device for which we want to associate
+ * all available queues with a given apqi.
+ * @apqi: The apqi which associated with all defined APID of the
+ * mediated device will define a AP queue.
+ *
+ * We define a local list to put all queues we find on the matrix driver
+ * device list when associating the apqi with all already defined apid for
+ * this matrix mediated device.
+ *
+ * If we can get all the devices we roll them to the mediated device list
+ * If we get errors we unroll them to the free list.
+ */
+static int vfio_ap_get_all_domains(struct ap_matrix_mdev *matrix_mdev, int apid)
+{
+ int apqi, apqn;
+ int ret = 0;
+ struct vfio_ap_queue *q;
+ struct list_head q_list;
+
+ INIT_LIST_HEAD(&q_list);
+
+ for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, AP_DOMAINS) {
+ apqn = AP_MKQID(apid, apqi);
+ q = vfio_ap_find_queue(apqn);
+ if (!q) {
+ ret = -EADDRNOTAVAIL;
+ goto rewind;
+ }
+ if (q->matrix_mdev) {
+ ret = -EADDRINUSE;
+ goto rewind;
+ }
+ list_move(&q->list, &q_list);
}
-
+ move_and_set(&q_list, &matrix_mdev->qlist, matrix_mdev);
return 0;
+rewind:
+ move_and_set(&q_list, &matrix_dev->free_list, NULL);
+ return ret;
}
-
/**
- * vfio_ap_mdev_verify_no_sharing
+ * vfio_ap_get_all_cards:
*
- * 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 matrix mediated device for which we want to associate
+ * all available queues with a given apqi.
+ * @apqi: The apqi which associated with all defined APID of the
+ * mediated device will define a AP queue.
*
- * @matrix_mdev: the mediated matrix device
+ * We define a local list to put all queues we find on the matrix device
+ * free list when associating the apqi with all already defined apid for
+ * this matrix mediated device.
*
- * Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE.
+ * If we can get all the devices we roll them to the mediated device list
+ * If we get errors we unroll them to the free list.
*/
-static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
+static int vfio_ap_get_all_cards(struct ap_matrix_mdev *matrix_mdev, int apqi)
{
- struct ap_matrix_mdev *lstdev;
- DECLARE_BITMAP(apm, AP_DEVICES);
- DECLARE_BITMAP(aqm, AP_DOMAINS);
-
- list_for_each_entry(lstdev, &matrix_dev->mdev_list, node) {
- if (matrix_mdev == lstdev)
- continue;
-
- memset(apm, 0, sizeof(apm));
- memset(aqm, 0, sizeof(aqm));
-
- /*
- * 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))
- continue;
-
- if (!bitmap_and(aqm, matrix_mdev->matrix.aqm,
- lstdev->matrix.aqm, AP_DOMAINS))
- continue;
-
- return -EADDRINUSE;
+ int apid, apqn;
+ int ret = 0;
+ struct vfio_ap_queue *q;
+ struct list_head q_list;
+ struct ap_matrix_mdev *tmp = NULL;
+
+ INIT_LIST_HEAD(&q_list);
+
+ for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, AP_DEVICES) {
+ apqn = AP_MKQID(apid, apqi);
+ q = vfio_ap_find_queue(apqn);
+ if (!q) {
+ ret = -EADDRNOTAVAIL;
+ goto rewind;
+ }
+ if (q->matrix_mdev) {
+ ret = -EADDRINUSE;
+ goto rewind;
+ }
+ list_move(&q->list, &q_list);
}
-
+ tmp = matrix_mdev;
+ move_and_set(&q_list, &matrix_mdev->qlist, matrix_mdev);
return 0;
+rewind:
+ move_and_set(&q_list, &matrix_dev->free_list, NULL);
+ return ret;
}

/**
@@ -330,21 +389,15 @@ static ssize_t assign_adapter_store(struct device *dev,
*/
mutex_lock(&matrix_dev->lock);

- ret = vfio_ap_mdev_verify_queues_reserved_for_apid(matrix_mdev, apid);
+ ret = vfio_ap_get_all_domains(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 = count;
goto done;

-share_err:
- clear_bit_inv(apid, matrix_mdev->matrix.apm);
done:
mutex_unlock(&matrix_dev->lock);

@@ -391,32 +444,13 @@ static ssize_t unassign_adapter_store(struct device *dev,

mutex_lock(&matrix_dev->lock);
clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm);
+ vfio_ap_put_all_domains(matrix_mdev, apid);
mutex_unlock(&matrix_dev->lock);

return count;
}
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;
-}
-
/**
* assign_domain_store
*
@@ -471,21 +505,15 @@ static ssize_t assign_domain_store(struct device *dev,

mutex_lock(&matrix_dev->lock);

- ret = vfio_ap_mdev_verify_queues_reserved_for_apqi(matrix_mdev, apqi);
+ ret = vfio_ap_get_all_cards(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 = count;
goto done;

-share_err:
- clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
done:
mutex_unlock(&matrix_dev->lock);

@@ -533,6 +561,7 @@ static ssize_t unassign_domain_store(struct device *dev,

mutex_lock(&matrix_dev->lock);
clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm);
+ vfio_ap_put_all_cards(matrix_mdev, apqi);
mutex_unlock(&matrix_dev->lock);

return count;
@@ -790,49 +819,22 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
return NOTIFY_OK;
}

-static int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
- unsigned int retry)
-{
- struct ap_queue_status status;
-
- do {
- status = ap_zapq(AP_MKQID(apid, apqi));
- switch (status.response_code) {
- case AP_RESPONSE_NORMAL:
- return 0;
- case AP_RESPONSE_RESET_IN_PROGRESS:
- case AP_RESPONSE_BUSY:
- msleep(20);
- break;
- default:
- /* things are really broken, give up */
- return -EIO;
- }
- } while (retry--);
-
- return -EBUSY;
-}
-
static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
{
int ret;
int rc = 0;
- unsigned long apid, apqi;
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
+ struct vfio_ap_queue *q;

- for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
- matrix_mdev->matrix.apm_max + 1) {
- for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
- matrix_mdev->matrix.aqm_max + 1) {
- ret = vfio_ap_mdev_reset_queue(apid, apqi, 1);
- /*
- * Regardless whether a queue turns out to be busy, or
- * is not operational, we need to continue resetting
- * the remaining queues.
- */
- if (ret)
- rc = ret;
- }
+ list_for_each_entry(q, &matrix_mdev->qlist, list) {
+ ret = vfio_ap_mdev_reset_queue(q);
+ /*
+ * Regardless whether a queue turns out to be busy, or
+ * is not operational, we need to continue resetting
+ * the remaining queues but notice the last error code.
+ */
+ if (ret)
+ rc = ret;
}

return rc;
@@ -868,10 +870,10 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
if (matrix_mdev->kvm)
kvm_arch_crypto_clear_masks(matrix_mdev->kvm);

+ matrix_mdev->kvm = NULL;
vfio_ap_mdev_reset_queues(mdev);
vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
&matrix_mdev->group_notifier);
- matrix_mdev->kvm = NULL;
module_put(THIS_MODULE);
}

@@ -905,7 +907,9 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
ret = vfio_ap_mdev_get_device_info(arg);
break;
case VFIO_DEVICE_RESET:
+ mutex_lock(&matrix_dev->lock);
ret = vfio_ap_mdev_reset_queues(mdev);
+ mutex_unlock(&matrix_dev->lock);
break;
default:
ret = -EOPNOTSUPP;
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index a910be1..3e6940c 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -40,6 +40,7 @@ struct ap_matrix_dev {
atomic_t available_instances;
struct ap_config_info info;
struct list_head mdev_list;
+ struct list_head free_list;
struct mutex lock;
struct ap_driver *vfio_ap_drv;
};
@@ -83,9 +84,15 @@ struct ap_matrix_mdev {
struct notifier_block group_notifier;
struct kvm *kvm;
struct kvm_s390_module_hook pqap_hook;
+ struct list_head qlist;
};

extern int vfio_ap_mdev_register(void);
extern void vfio_ap_mdev_unregister(void);

+struct vfio_ap_queue {
+ struct list_head list;
+ struct ap_matrix_mdev *matrix_mdev;
+ int apqn;
+};
#endif /* _VFIO_AP_PRIVATE_H_ */
--
2.7.4
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