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virtio-pci library: report resource address

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Sometimes it might be useful to report the capability physical
address. One example is to report the physical address of the doorbell
in order to be mapped by userspace.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210415073147.19331-7-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang
2021-04-15 03:31:46 -04:00
committed by Michael S. Tsirkin
parent fd466b3694
commit 9e311bcad7
4 changed files with 23 additions and 10 deletions
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24
drivers/virtio/virtio_pci_modern_dev.c
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@@ -13,13 +13,14 @@
* @start: start from the capability
* @size: map size
* @len: the length that is actually mapped
* @pa: physical address of the capability
*
* Returns the io address of for the part of the capability
*/
static void __iomem *
vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off,
size_t minlen, u32 align, u32 start, u32 size,
size_t *len)
size_t *len, resource_size_t *pa)
{
struct pci_dev *dev = mdev->pci_dev;
u8 bar;
@@ -87,6 +88,9 @@ vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off,
dev_err(&dev->dev,
"virtio_pci: unable to map virtio %u@%u on bar %i\n",
length, offset, bar);
else if (pa)
*pa = pci_resource_start(dev, bar) + offset;
return p;
}
@@ -273,12 +277,12 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev)
mdev->common = vp_modern_map_capability(mdev, common,
sizeof(struct virtio_pci_common_cfg), 4,
0, sizeof(struct virtio_pci_common_cfg),
NULL);
NULL, NULL);
if (!mdev->common)
goto err_map_common;
mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1,
0, 1,
NULL);
NULL, NULL);
if (!mdev->isr)
goto err_map_isr;
@@ -306,7 +310,8 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev)
mdev->notify_base = vp_modern_map_capability(mdev, notify,
2, 2,
0, notify_length,
&mdev->notify_len);
&mdev->notify_len,
&mdev->notify_pa);
if (!mdev->notify_base)
goto err_map_notify;
} else {
@@ -319,7 +324,8 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev)
if (device) {
mdev->device = vp_modern_map_capability(mdev, device, 0, 4,
0, PAGE_SIZE,
&mdev->device_len);
&mdev->device_len,
NULL);
if (!mdev->device)
goto err_map_device;
}
@@ -595,11 +601,12 @@ static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
* specific virtqueue
* @mdev: the modern virtio-pci device
* @index: the queue index
* @pa: the pointer to the physical address of the nofity area
*
* Returns the address of the notification area
*/
void *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
u16 index)
u16 index, resource_size_t *pa)
{
u16 off = vp_modern_get_queue_notify_off(mdev, index);
@@ -614,13 +621,16 @@ void *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
index, mdev->notify_len);
return NULL;
}
if (pa)
*pa = mdev->notify_pa +
off * mdev->notify_offset_multiplier;
return (void __force *)mdev->notify_base +
off * mdev->notify_offset_multiplier;
} else {
return (void __force *)vp_modern_map_capability(mdev,
mdev->notify_map_cap, 2, 2,
off * mdev->notify_offset_multiplier, 2,
NULL);
NULL, pa);
}
}
EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);