[PATCH 2/6] virtio: add context flag to find vqs

Michael S. Tsirkin
2017-03-29T20:48:51Z

Allows maintaining extra context per vq. For ease of use, passing in
NULL is legal and disables the feature for all vqs.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
drivers/misc/mic/vop/vop_main.c | 9 ++++++---
drivers/s390/virtio/kvm_virtio.c | 6 ++++--
drivers/s390/virtio/virtio_ccw.c | 7 ++++---
drivers/virtio/virtio_mmio.c | 8 +++++---
drivers/virtio/virtio_pci_common.c | 18 +++++++++++-------
drivers/virtio/virtio_pci_common.h | 4 +++-
drivers/virtio/virtio_pci_legacy.c | 4 +++-
drivers/virtio/virtio_pci_modern.c | 12 ++++++++----
drivers/virtio/virtio_ring.c | 7 +++++--
include/linux/virtio_config.h | 18 +++++++++++++++---
include/linux/virtio_ring.h | 3 +++
11 files changed, 67 insertions(+), 29 deletions(-)

diff --git a/drivers/misc/mic/vop/vop_main.c b/drivers/misc/mic/vop/vop_main.c
index c2e29d7..a341938 100644
--- a/drivers/misc/mic/vop/vop_main.c
+++ b/drivers/misc/mic/vop/vop_main.c
@@ -278,7 +278,7 @@ static void vop_del_vqs(struct virtio_device *dev)
static struct virtqueue *vop_find_vq(struct virtio_device *dev,
unsigned index,
void (*callback)(struct virtqueue *vq),
- const char *name)
+ const char *name, bool ctx)
{
struct _vop_vdev *vdev = to_vopvdev(dev);
struct vop_device *vpdev = vdev->vpdev;
@@ -314,6 +314,7 @@ static struct virtqueue *vop_find_vq(struct virtio_device *dev,
le16_to_cpu(config.num), MIC_VIRTIO_RING_ALIGN,
dev,
false,
+ ctx,
(void __force *)va, vop_notify, callback, name);
if (!vq) {
err = -ENOMEM;
@@ -374,7 +375,8 @@ static struct virtqueue *vop_find_vq(struct virtio_device *dev,
static int vop_find_vqs(struct virtio_device *dev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
- const char * const names[], struct irq_affinity *desc)
+ const char * const names[], const bool *ctx,
+ struct irq_affinity *desc)
{
struct _vop_vdev *vdev = to_vopvdev(dev);
struct vop_device *vpdev = vdev->vpdev;
@@ -388,7 +390,8 @@ static int vop_find_vqs(struct virtio_device *dev, unsigned nvqs,
for (i = 0; i < nvqs; ++i) {
dev_dbg(_vop_dev(vdev), "%s: %d: %s\n",
__func__, i, names[i]);
- vqs[i] = vop_find_vq(dev, i, callbacks[i], names[i]);
+ vqs[i] = vop_find_vq(dev, i, callbacks[i], names[i],
+ ctx ? ctx[i] : false);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto error;
diff --git a/drivers/s390/virtio/kvm_virtio.c b/drivers/s390/virtio/kvm_virtio.c
index 2ce0b3e..81b33aa 100644
--- a/drivers/s390/virtio/kvm_virtio.c
+++ b/drivers/s390/virtio/kvm_virtio.c
@@ -189,7 +189,7 @@ static bool kvm_notify(struct virtqueue *vq)
static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
unsigned index,
void (*callback)(struct virtqueue *vq),
- const char *name)
+ const char *name, bool ctx)
{
struct kvm_device *kdev = to_kvmdev(vdev);
struct kvm_vqconfig *config;
@@ -256,6 +256,7 @@ static int kvm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[],
+ const bool *ctx,
struct irq_affinity *desc)
{
struct kvm_device *kdev = to_kvmdev(vdev);
@@ -266,7 +267,8 @@ static int kvm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
return -ENOENT;

for (i = 0; i < nvqs; ++i) {
- vqs[i] = kvm_find_vq(vdev, i, callbacks[i], names[i]);
+ vqs[i] = kvm_find_vq(vdev, i, callbacks[i], names[i],
+ ctx ? ctx[i] : false);
if (IS_ERR(vqs[i]))
goto error;
}
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 0ed209f..2a76ea7 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -484,7 +484,7 @@ static void virtio_ccw_del_vqs(struct virtio_device *vdev)

static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
int i, vq_callback_t *callback,
- const char *name,
+ const char *name, bool ctx,
struct ccw1 *ccw)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
@@ -522,7 +522,7 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
}

vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
- true, info->queue, virtio_ccw_kvm_notify,
+ true, ctx, info->queue, virtio_ccw_kvm_notify,
callback, name);
if (!vq) {
/* For now, we fail if we can't get the requested size. */
@@ -629,6 +629,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[],
+ const bool *ctx,
struct irq_affinity *desc)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
@@ -642,7 +643,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,

for (i = 0; i < nvqs; ++i) {
vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
- ccw);
+ ctx ? ctx[i] : false, ccw);
if (IS_ERR(vqs[i])) {
ret = PTR_ERR(vqs[i]);
vqs[i] = NULL;
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 78343b8..74dc717 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -351,7 +351,7 @@ static void vm_del_vqs(struct virtio_device *vdev)

static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
void (*callback)(struct virtqueue *vq),
- const char *name)
+ const char *name, bool ctx)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
struct virtio_mmio_vq_info *info;
@@ -388,7 +388,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,

/* Create the vring */
vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
- true, true, vm_notify, callback, name);
+ true, true, ctx, vm_notify, callback, name);
if (!vq) {
err = -ENOMEM;
goto error_new_virtqueue;
@@ -447,6 +447,7 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[],
+ const bool *ctx,
struct irq_affinity *desc)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
@@ -459,7 +460,8 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
return err;

for (i = 0; i < nvqs; ++i) {
- vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]);
+ vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i],
+ ctx ? ctx[i] : false);
if (IS_ERR(vqs[i])) {
vm_del_vqs(vdev);
return PTR_ERR(vqs[i]);
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 5905349..18e74c8 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -143,7 +143,8 @@ void vp_del_vqs(struct virtio_device *vdev)

static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
- const char * const names[], struct irq_affinity *desc)
+ const char * const names[], const bool *ctx,
+ struct irq_affinity *desc)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
const char *name = dev_name(&vp_dev->vdev.dev);
@@ -225,7 +226,8 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
msix_vec = VIRTIO_MSI_NO_VECTOR;

vqs[i] = vp_dev->setup_vq(vp_dev, i, callbacks[i], names[i],
- msix_vec);
+ ctx ? ctx[i] : false,
+ msix_vec);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto out_remove_vqs;
@@ -282,7 +284,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,

static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
- const char * const names[])
+ const char * const names[], const bool *ctx)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i, err;
@@ -298,7 +300,8 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
continue;
}
vqs[i] = vp_dev->setup_vq(vp_dev, i, callbacks[i], names[i],
- VIRTIO_MSI_NO_VECTOR);
+ ctx ? ctx[i] : false,
+ VIRTIO_MSI_NO_VECTOR);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto out_remove_vqs;
@@ -316,14 +319,15 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
/* the config->find_vqs() implementation */
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
- const char * const names[], struct irq_affinity *desc)
+ const char * const names[], const bool *ctx,
+ struct irq_affinity *desc)
{
int err;

- err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, desc);
+ err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, ctx, desc);
if (!err)
return 0;
- return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names);
+ return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx);
}

const char *vp_bus_name(struct virtio_device *vdev)
diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
index ac8c9d7..8149dd3 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -77,6 +77,7 @@ struct virtio_pci_device {
unsigned idx,
void (*callback)(struct virtqueue *vq),
const char *name,
+ bool ctx,
u16 msix_vec);
void (*del_vq)(struct virtqueue *vq);

@@ -98,7 +99,8 @@ void vp_del_vqs(struct virtio_device *vdev);
/* the config->find_vqs() implementation */
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
- const char * const names[], struct irq_affinity *desc);
+ const char * const names[], const bool *ctx,
+ struct irq_affinity *desc);
const char *vp_bus_name(struct virtio_device *vdev);

/* Setup the affinity for a virtqueue:
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index f7362c5..a976452 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -115,6 +115,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
+ bool ctx,
u16 msix_vec)
{
struct virtqueue *vq;
@@ -132,7 +133,8 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
/* create the vring */
vq = vring_create_virtqueue(index, num,
VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
- true, false, vp_notify, callback, name);
+ true, false, ctx,
+ vp_notify, callback, name);
if (!vq)
return ERR_PTR(-ENOMEM);

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 7bc3004..709f7e2 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -296,6 +296,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
+ bool ctx,
u16 msix_vec)
{
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
@@ -325,7 +326,8 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
/* create the vring */
vq = vring_create_virtqueue(index, num,
SMP_CACHE_BYTES, &vp_dev->vdev,
- true, true, vp_notify, callback, name);
+ true, true, ctx,
+ vp_notify, callback, name);
if (!vq)
return ERR_PTR(-ENOMEM);

@@ -384,12 +386,14 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}

static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
- struct virtqueue *vqs[], vq_callback_t *callbacks[],
- const char * const names[], struct irq_affinity *desc)
+ struct virtqueue *vqs[],
+ vq_callback_t *callbacks[],
+ const char * const names[], const bool *ctx,
+ struct irq_affinity *desc)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtqueue *vq;
- int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, desc);
+ int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc);

if (rc)
return rc;
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 409aeaa..b23b5fa 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -916,6 +916,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
struct vring vring,
struct virtio_device *vdev,
bool weak_barriers,
+ bool context,
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name)
@@ -1019,6 +1020,7 @@ struct virtqueue *vring_create_virtqueue(
struct virtio_device *vdev,
bool weak_barriers,
bool may_reduce_num,
+ bool context,
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name)
@@ -1058,7 +1060,7 @@ struct virtqueue *vring_create_virtqueue(
queue_size_in_bytes = vring_size(num, vring_align);
vring_init(&vring, num, queue, vring_align);

- vq = __vring_new_virtqueue(index, vring, vdev, weak_barriers,
+ vq = __vring_new_virtqueue(index, vring, vdev, weak_barriers, context,
notify, callback, name);
if (!vq) {
vring_free_queue(vdev, queue_size_in_bytes, queue,
@@ -1079,6 +1081,7 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
unsigned int vring_align,
struct virtio_device *vdev,
bool weak_barriers,
+ bool context,
void *pages,
bool (*notify)(struct virtqueue *vq),
void (*callback)(struct virtqueue *vq),
@@ -1086,7 +1089,7 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
{
struct vring vring;
vring_init(&vring, num, pages, vring_align);
- return __vring_new_virtqueue(index, vring, vdev, weak_barriers,
+ return __vring_new_virtqueue(index, vring, vdev, weak_barriers, context,
notify, callback, name);
}
EXPORT_SYMBOL_GPL(vring_new_virtqueue);
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 47f3d80..0133d8a 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -72,7 +72,8 @@ struct virtio_config_ops {
void (*reset)(struct virtio_device *vdev);
int (*find_vqs)(struct virtio_device *, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
- const char * const names[], struct irq_affinity *desc);
+ const char * const names[], const bool *ctx,
+ struct irq_affinity *desc);
void (*del_vqs)(struct virtio_device *);
u64 (*get_features)(struct virtio_device *vdev);
int (*finalize_features)(struct virtio_device *vdev);
@@ -173,7 +174,8 @@ struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
vq_callback_t *callbacks[] = { c };
const char *names[] = { n };
struct virtqueue *vq;
- int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL);
+ int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL,
+ NULL);
if (err < 0)
return ERR_PTR(err);
return vq;
@@ -185,7 +187,17 @@ int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
const char * const names[],
struct irq_affinity *desc)
{
- return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, desc);
+ return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL, desc);
+}
+
+static inline
+int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
+ struct virtqueue *vqs[], vq_callback_t *callbacks[],
+ const char * const names[], const bool *ctx,
+ struct irq_affinity *desc)
+{
+ return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, ctx,
+ desc);
}

/**
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index e8d3693..270cfa8 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -71,6 +71,7 @@ struct virtqueue *vring_create_virtqueue(unsigned int index,
struct virtio_device *vdev,
bool weak_barriers,
bool may_reduce_num,
+ bool ctx,
bool (*notify)(struct virtqueue *vq),
void (*callback)(struct virtqueue *vq),
const char *name);
@@ -80,6 +81,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
struct vring vring,
struct virtio_device *vdev,
bool weak_barriers,
+ bool ctx,
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name);
@@ -93,6 +95,7 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
unsigned int vring_align,
struct virtio_device *vdev,
bool weak_barriers,
+ bool ctx,
void *pages,
bool (*notify)(struct virtqueue *vq),
void (*callback)(struct virtqueue *vq),
--
MST