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Message-ID: <20250813054831.25865-5-jasowang@redhat.com>
Date: Wed, 13 Aug 2025 13:48:26 +0800
From: Jason Wang <jasowang@...hat.com>
To: mst@...hat.com,
jasowang@...hat.com,
xuanzhuo@...ux.alibaba.com,
eperezma@...hat.com,
virtualization@...ts.linux.dev,
linux-kernel@...r.kernel.org
Cc: hch@...radead.org
Subject: [PATCH V5 4/9] virtio: introduce vring_mapping_token
Following patch will introduce the mapping operations for virtio
device. In order to achieve this, besides the dma device, virtio core
needs to support a transport or device specific mapping token as well.
So this patch introduces a union container of a dma device and opaque
mapping token. The idea is the allow the transport layer to pass
device specific mapping token which will be used as a parameter for
the virtio mapping operations. For the transport or device that is
using DMA, dma device is still being used.
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
drivers/virtio/virtio_ring.c | 110 ++++++++++++++++++-----------------
drivers/virtio/virtio_vdpa.c | 6 +-
include/linux/virtio.h | 7 +++
include/linux/virtio_ring.h | 7 ++-
4 files changed, 72 insertions(+), 58 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 482a268af851..fb1d407d5f1b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -210,8 +210,7 @@ struct vring_virtqueue {
/* DMA, allocation, and size information */
bool we_own_ring;
- /* Device used for doing DMA */
- struct device *dma_dev;
+ union vring_mapping_token mapping_token;
#ifdef DEBUG
/* They're supposed to lock for us. */
@@ -307,10 +306,10 @@ EXPORT_SYMBOL_GPL(virtio_max_dma_size);
static void *vring_alloc_queue(struct virtio_device *vdev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
if (vring_use_map_api(vdev)) {
- return dma_alloc_coherent(dma_dev, size,
+ return dma_alloc_coherent(mapping_token->dma_dev, size,
dma_handle, flag);
} else {
void *queue = alloc_pages_exact(PAGE_ALIGN(size), flag);
@@ -341,22 +340,22 @@ static void *vring_alloc_queue(struct virtio_device *vdev, size_t size,
static void vring_free_queue(struct virtio_device *vdev, size_t size,
void *queue, dma_addr_t dma_handle,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
if (vring_use_map_api(vdev))
- dma_free_coherent(dma_dev, size, queue, dma_handle);
+ dma_free_coherent(mapping_token->dma_dev, size, queue, dma_handle);
else
free_pages_exact(queue, PAGE_ALIGN(size));
}
/*
- * The DMA ops on various arches are rather gnarly right now, and
- * making all of the arch DMA ops work on the vring device itself
+ * The map ops on various arches are rather gnarly right now, and
+ * making all of the arch map ops work on the vring device itself
* is a mess.
*/
static struct device *vring_dma_dev(const struct vring_virtqueue *vq)
{
- return vq->dma_dev;
+ return vq->mapping_token.dma_dev;
}
/* Map one sg entry. */
@@ -1056,12 +1055,13 @@ static int vring_alloc_state_extra_split(struct vring_virtqueue_split *vring_spl
}
static void vring_free_split(struct vring_virtqueue_split *vring_split,
- struct virtio_device *vdev, struct device *dma_dev)
+ struct virtio_device *vdev,
+ union vring_mapping_token *mapping_token)
{
vring_free_queue(vdev, vring_split->queue_size_in_bytes,
vring_split->vring.desc,
vring_split->queue_dma_addr,
- dma_dev);
+ mapping_token);
kfree(vring_split->desc_state);
kfree(vring_split->desc_extra);
@@ -1072,7 +1072,7 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
u32 num,
unsigned int vring_align,
bool may_reduce_num,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
void *queue = NULL;
dma_addr_t dma_addr;
@@ -1088,7 +1088,7 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
queue = vring_alloc_queue(vdev, vring_size(num, vring_align),
&dma_addr,
GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
- dma_dev);
+ mapping_token);
if (queue)
break;
if (!may_reduce_num)
@@ -1102,7 +1102,7 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
/* Try to get a single page. You are my only hope! */
queue = vring_alloc_queue(vdev, vring_size(num, vring_align),
&dma_addr, GFP_KERNEL | __GFP_ZERO,
- dma_dev);
+ mapping_token);
}
if (!queue)
return -ENOMEM;
@@ -1126,7 +1126,7 @@ static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
struct vring_virtqueue *vq;
int err;
@@ -1149,7 +1149,7 @@ static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
#else
vq->broken = false;
#endif
- vq->dma_dev = dma_dev;
+ vq->mapping_token = *mapping_token;
vq->use_map_api = vring_use_map_api(vdev);
vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
@@ -1187,21 +1187,21 @@ static struct virtqueue *vring_create_virtqueue_split(
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
struct vring_virtqueue_split vring_split = {};
struct virtqueue *vq;
int err;
err = vring_alloc_queue_split(&vring_split, vdev, num, vring_align,
- may_reduce_num, dma_dev);
+ may_reduce_num, mapping_token);
if (err)
return NULL;
vq = __vring_new_virtqueue_split(index, &vring_split, vdev, weak_barriers,
- context, notify, callback, name, dma_dev);
+ context, notify, callback, name, mapping_token);
if (!vq) {
- vring_free_split(&vring_split, vdev, dma_dev);
+ vring_free_split(&vring_split, vdev, mapping_token);
return NULL;
}
@@ -1220,7 +1220,7 @@ static int virtqueue_resize_split(struct virtqueue *_vq, u32 num)
err = vring_alloc_queue_split(&vring_split, vdev, num,
vq->split.vring_align,
vq->split.may_reduce_num,
- vring_dma_dev(vq));
+ &vq->mapping_token);
if (err)
goto err;
@@ -1238,7 +1238,7 @@ static int virtqueue_resize_split(struct virtqueue *_vq, u32 num)
return 0;
err_state_extra:
- vring_free_split(&vring_split, vdev, vring_dma_dev(vq));
+ vring_free_split(&vring_split, vdev, &vq->mapping_token);
err:
virtqueue_reinit_split(vq);
return -ENOMEM;
@@ -1947,25 +1947,25 @@ static struct vring_desc_extra *vring_alloc_desc_extra(unsigned int num)
static void vring_free_packed(struct vring_virtqueue_packed *vring_packed,
struct virtio_device *vdev,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
if (vring_packed->vring.desc)
vring_free_queue(vdev, vring_packed->ring_size_in_bytes,
vring_packed->vring.desc,
vring_packed->ring_dma_addr,
- dma_dev);
+ mapping_token);
if (vring_packed->vring.driver)
vring_free_queue(vdev, vring_packed->event_size_in_bytes,
vring_packed->vring.driver,
vring_packed->driver_event_dma_addr,
- dma_dev);
+ mapping_token);
if (vring_packed->vring.device)
vring_free_queue(vdev, vring_packed->event_size_in_bytes,
vring_packed->vring.device,
vring_packed->device_event_dma_addr,
- dma_dev);
+ mapping_token);
kfree(vring_packed->desc_state);
kfree(vring_packed->desc_extra);
@@ -1973,7 +1973,7 @@ static void vring_free_packed(struct vring_virtqueue_packed *vring_packed,
static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
struct virtio_device *vdev,
- u32 num, struct device *dma_dev)
+ u32 num, union vring_mapping_token *mapping_token)
{
struct vring_packed_desc *ring;
struct vring_packed_desc_event *driver, *device;
@@ -1985,7 +1985,7 @@ static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
ring = vring_alloc_queue(vdev, ring_size_in_bytes,
&ring_dma_addr,
GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
- dma_dev);
+ mapping_token);
if (!ring)
goto err;
@@ -1998,7 +1998,7 @@ static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
driver = vring_alloc_queue(vdev, event_size_in_bytes,
&driver_event_dma_addr,
GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
- dma_dev);
+ mapping_token);
if (!driver)
goto err;
@@ -2009,7 +2009,7 @@ static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
device = vring_alloc_queue(vdev, event_size_in_bytes,
&device_event_dma_addr,
GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
- dma_dev);
+ mapping_token);
if (!device)
goto err;
@@ -2021,7 +2021,7 @@ static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
return 0;
err:
- vring_free_packed(vring_packed, vdev, dma_dev);
+ vring_free_packed(vring_packed, vdev, mapping_token);
return -ENOMEM;
}
@@ -2097,7 +2097,7 @@ static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
struct vring_virtqueue *vq;
int err;
@@ -2120,7 +2120,7 @@ static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
vq->broken = false;
#endif
vq->packed_ring = true;
- vq->dma_dev = dma_dev;
+ vq->mapping_token = *mapping_token;
vq->use_map_api = vring_use_map_api(vdev);
vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
@@ -2158,18 +2158,18 @@ static struct virtqueue *vring_create_virtqueue_packed(
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
struct vring_virtqueue_packed vring_packed = {};
struct virtqueue *vq;
- if (vring_alloc_queue_packed(&vring_packed, vdev, num, dma_dev))
+ if (vring_alloc_queue_packed(&vring_packed, vdev, num, mapping_token))
return NULL;
vq = __vring_new_virtqueue_packed(index, &vring_packed, vdev, weak_barriers,
- context, notify, callback, name, dma_dev);
+ context, notify, callback, name, mapping_token);
if (!vq) {
- vring_free_packed(&vring_packed, vdev, dma_dev);
+ vring_free_packed(&vring_packed, vdev, mapping_token);
return NULL;
}
@@ -2185,7 +2185,8 @@ static int virtqueue_resize_packed(struct virtqueue *_vq, u32 num)
struct virtio_device *vdev = _vq->vdev;
int err;
- if (vring_alloc_queue_packed(&vring_packed, vdev, num, vring_dma_dev(vq)))
+ if (vring_alloc_queue_packed(&vring_packed, vdev,
+ num, &vq->mapping_token))
goto err_ring;
err = vring_alloc_state_extra_packed(&vring_packed);
@@ -2202,7 +2203,7 @@ static int virtqueue_resize_packed(struct virtqueue *_vq, u32 num)
return 0;
err_state_extra:
- vring_free_packed(&vring_packed, vdev, vring_dma_dev(vq));
+ vring_free_packed(&vring_packed, vdev, &vq->mapping_token);
err_ring:
virtqueue_reinit_packed(vq);
return -ENOMEM;
@@ -2423,6 +2424,7 @@ int virtqueue_add_inbuf_premapped(struct virtqueue *vq,
}
EXPORT_SYMBOL_GPL(virtqueue_add_inbuf_premapped);
+
/**
* virtqueue_dma_dev - get the dma dev
* @_vq: the struct virtqueue we're talking about.
@@ -2434,7 +2436,7 @@ struct device *virtqueue_dma_dev(struct virtqueue *_vq)
struct vring_virtqueue *vq = to_vvq(_vq);
if (vq->use_map_api)
- return vring_dma_dev(vq);
+ return vq->mapping_token.dma_dev;
else
return NULL;
}
@@ -2719,19 +2721,20 @@ struct virtqueue *vring_create_virtqueue(
void (*callback)(struct virtqueue *),
const char *name)
{
+ union vring_mapping_token mapping_token = {.dma_dev = vdev->dev.parent};
if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
return vring_create_virtqueue_packed(index, num, vring_align,
vdev, weak_barriers, may_reduce_num,
- context, notify, callback, name, vdev->dev.parent);
+ context, notify, callback, name, &mapping_token);
return vring_create_virtqueue_split(index, num, vring_align,
vdev, weak_barriers, may_reduce_num,
- context, notify, callback, name, vdev->dev.parent);
+ context, notify, callback, name, &mapping_token);
}
EXPORT_SYMBOL_GPL(vring_create_virtqueue);
-struct virtqueue *vring_create_virtqueue_dma(
+struct virtqueue *vring_create_virtqueue_map(
unsigned int index,
unsigned int num,
unsigned int vring_align,
@@ -2742,19 +2745,19 @@ struct virtqueue *vring_create_virtqueue_dma(
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
const char *name,
- struct device *dma_dev)
+ union vring_mapping_token *mapping_token)
{
if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
return vring_create_virtqueue_packed(index, num, vring_align,
vdev, weak_barriers, may_reduce_num,
- context, notify, callback, name, dma_dev);
+ context, notify, callback, name, mapping_token);
return vring_create_virtqueue_split(index, num, vring_align,
vdev, weak_barriers, may_reduce_num,
- context, notify, callback, name, dma_dev);
+ context, notify, callback, name, mapping_token);
}
-EXPORT_SYMBOL_GPL(vring_create_virtqueue_dma);
+EXPORT_SYMBOL_GPL(vring_create_virtqueue_map);
/**
* virtqueue_resize - resize the vring of vq
@@ -2865,6 +2868,7 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
const char *name)
{
struct vring_virtqueue_split vring_split = {};
+ union vring_mapping_token mapping_token = {.dma_dev = vdev->dev.parent};
if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
struct vring_virtqueue_packed vring_packed = {};
@@ -2874,13 +2878,13 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
return __vring_new_virtqueue_packed(index, &vring_packed,
vdev, weak_barriers,
context, notify, callback,
- name, vdev->dev.parent);
+ name, &mapping_token);
}
vring_init(&vring_split.vring, num, pages, vring_align);
return __vring_new_virtqueue_split(index, &vring_split, vdev, weak_barriers,
context, notify, callback, name,
- vdev->dev.parent);
+ &mapping_token);
}
EXPORT_SYMBOL_GPL(vring_new_virtqueue);
@@ -2894,19 +2898,19 @@ static void vring_free(struct virtqueue *_vq)
vq->packed.ring_size_in_bytes,
vq->packed.vring.desc,
vq->packed.ring_dma_addr,
- vring_dma_dev(vq));
+ &vq->mapping_token);
vring_free_queue(vq->vq.vdev,
vq->packed.event_size_in_bytes,
vq->packed.vring.driver,
vq->packed.driver_event_dma_addr,
- vring_dma_dev(vq));
+ &vq->mapping_token);
vring_free_queue(vq->vq.vdev,
vq->packed.event_size_in_bytes,
vq->packed.vring.device,
vq->packed.device_event_dma_addr,
- vring_dma_dev(vq));
+ &vq->mapping_token);
kfree(vq->packed.desc_state);
kfree(vq->packed.desc_extra);
@@ -2915,7 +2919,7 @@ static void vring_free(struct virtqueue *_vq)
vq->split.queue_size_in_bytes,
vq->split.vring.desc,
vq->split.queue_dma_addr,
- vring_dma_dev(vq));
+ &vq->mapping_token);
}
}
if (!vq->packed_ring) {
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index e25610e3393a..acea98ab08ee 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -139,6 +139,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
struct vdpa_callback cb;
struct virtqueue *vq;
u64 desc_addr, driver_addr, device_addr;
+ union vring_mapping_token mapping_token = {0};
/* Assume split virtqueue, switch to packed if necessary */
struct vdpa_vq_state state = {0};
u32 align, max_num, min_num = 1;
@@ -185,9 +186,10 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
dma_dev = ops->get_vq_dma_dev(vdpa, index);
else
dma_dev = vdpa_get_dma_dev(vdpa);
- vq = vring_create_virtqueue_dma(index, max_num, align, vdev,
+ mapping_token.dma_dev = dma_dev;
+ vq = vring_create_virtqueue_map(index, max_num, align, vdev,
true, may_reduce_num, ctx,
- notify, callback, name, dma_dev);
+ notify, callback, name, &mapping_token);
if (!vq) {
err = -ENOMEM;
goto error_new_virtqueue;
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index addbc209275a..37029df94aaf 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -40,6 +40,13 @@ struct virtqueue {
void *priv;
};
+union vring_mapping_token {
+ /* Device that performs DMA */
+ struct device *dma_dev;
+ /* Transport specific token used for doing map */
+ void *opaque;
+};
+
int virtqueue_add_outbuf(struct virtqueue *vq,
struct scatterlist sg[], unsigned int num,
void *data,
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index 9b33df741b63..fd997178da2a 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -3,6 +3,7 @@
#define _LINUX_VIRTIO_RING_H
#include <asm/barrier.h>
+#include <linux/virtio.h>
#include <linux/irqreturn.h>
#include <uapi/linux/virtio_ring.h>
@@ -79,9 +80,9 @@ struct virtqueue *vring_create_virtqueue(unsigned int index,
/*
* Creates a virtqueue and allocates the descriptor ring with per
- * virtqueue DMA device.
+ * virtqueue mapping operations.
*/
-struct virtqueue *vring_create_virtqueue_dma(unsigned int index,
+struct virtqueue *vring_create_virtqueue_map(unsigned int index,
unsigned int num,
unsigned int vring_align,
struct virtio_device *vdev,
@@ -91,7 +92,7 @@ struct virtqueue *vring_create_virtqueue_dma(unsigned int index,
bool (*notify)(struct virtqueue *vq),
void (*callback)(struct virtqueue *vq),
const char *name,
- struct device *dma_dev);
+ union vring_mapping_token *mapping_token);
/*
* Creates a virtqueue with a standard layout but a caller-allocated
--
2.31.1
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