mirror of https://gitee.com/openkylin/linux.git
600 lines
18 KiB
C
600 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
#include <linux/virtio_pci_modern.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
|
|
/*
|
|
* vp_modern_map_capability - map a part of virtio pci capability
|
|
* @mdev: the modern virtio-pci device
|
|
* @off: offset of the capability
|
|
* @minlen: minimal length of the capability
|
|
* @align: align requirement
|
|
* @start: start from the capability
|
|
* @size: map size
|
|
* @len: the length that is actually mapped
|
|
*
|
|
* Returns the io address of for the part of the capability
|
|
*/
|
|
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)
|
|
{
|
|
struct pci_dev *dev = mdev->pci_dev;
|
|
u8 bar;
|
|
u32 offset, length;
|
|
void __iomem *p;
|
|
|
|
pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap,
|
|
bar),
|
|
&bar);
|
|
pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset),
|
|
&offset);
|
|
pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length),
|
|
&length);
|
|
|
|
if (length <= start) {
|
|
dev_err(&dev->dev,
|
|
"virtio_pci: bad capability len %u (>%u expected)\n",
|
|
length, start);
|
|
return NULL;
|
|
}
|
|
|
|
if (length - start < minlen) {
|
|
dev_err(&dev->dev,
|
|
"virtio_pci: bad capability len %u (>=%zu expected)\n",
|
|
length, minlen);
|
|
return NULL;
|
|
}
|
|
|
|
length -= start;
|
|
|
|
if (start + offset < offset) {
|
|
dev_err(&dev->dev,
|
|
"virtio_pci: map wrap-around %u+%u\n",
|
|
start, offset);
|
|
return NULL;
|
|
}
|
|
|
|
offset += start;
|
|
|
|
if (offset & (align - 1)) {
|
|
dev_err(&dev->dev,
|
|
"virtio_pci: offset %u not aligned to %u\n",
|
|
offset, align);
|
|
return NULL;
|
|
}
|
|
|
|
if (length > size)
|
|
length = size;
|
|
|
|
if (len)
|
|
*len = length;
|
|
|
|
if (minlen + offset < minlen ||
|
|
minlen + offset > pci_resource_len(dev, bar)) {
|
|
dev_err(&dev->dev,
|
|
"virtio_pci: map virtio %zu@%u "
|
|
"out of range on bar %i length %lu\n",
|
|
minlen, offset,
|
|
bar, (unsigned long)pci_resource_len(dev, bar));
|
|
return NULL;
|
|
}
|
|
|
|
p = pci_iomap_range(dev, bar, offset, length);
|
|
if (!p)
|
|
dev_err(&dev->dev,
|
|
"virtio_pci: unable to map virtio %u@%u on bar %i\n",
|
|
length, offset, bar);
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_map_capability);
|
|
|
|
/**
|
|
* virtio_pci_find_capability - walk capabilities to find device info.
|
|
* @dev: the pci device
|
|
* @cfg_type: the VIRTIO_PCI_CAP_* value we seek
|
|
* @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO.
|
|
* @bars: the bitmask of BARs
|
|
*
|
|
* Returns offset of the capability, or 0.
|
|
*/
|
|
static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
|
|
u32 ioresource_types, int *bars)
|
|
{
|
|
int pos;
|
|
|
|
for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
|
|
pos > 0;
|
|
pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
|
|
u8 type, bar;
|
|
pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
|
|
cfg_type),
|
|
&type);
|
|
pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
|
|
bar),
|
|
&bar);
|
|
|
|
/* Ignore structures with reserved BAR values */
|
|
if (bar > 0x5)
|
|
continue;
|
|
|
|
if (type == cfg_type) {
|
|
if (pci_resource_len(dev, bar) &&
|
|
pci_resource_flags(dev, bar) & ioresource_types) {
|
|
*bars |= (1 << bar);
|
|
return pos;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* This is part of the ABI. Don't screw with it. */
|
|
static inline void check_offsets(void)
|
|
{
|
|
/* Note: disk space was harmed in compilation of this function. */
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR !=
|
|
offsetof(struct virtio_pci_cap, cap_vndr));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT !=
|
|
offsetof(struct virtio_pci_cap, cap_next));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN !=
|
|
offsetof(struct virtio_pci_cap, cap_len));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE !=
|
|
offsetof(struct virtio_pci_cap, cfg_type));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR !=
|
|
offsetof(struct virtio_pci_cap, bar));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET !=
|
|
offsetof(struct virtio_pci_cap, offset));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH !=
|
|
offsetof(struct virtio_pci_cap, length));
|
|
BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT !=
|
|
offsetof(struct virtio_pci_notify_cap,
|
|
notify_off_multiplier));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT !=
|
|
offsetof(struct virtio_pci_common_cfg,
|
|
device_feature_select));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF !=
|
|
offsetof(struct virtio_pci_common_cfg, device_feature));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT !=
|
|
offsetof(struct virtio_pci_common_cfg,
|
|
guest_feature_select));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF !=
|
|
offsetof(struct virtio_pci_common_cfg, guest_feature));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX !=
|
|
offsetof(struct virtio_pci_common_cfg, msix_config));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ !=
|
|
offsetof(struct virtio_pci_common_cfg, num_queues));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS !=
|
|
offsetof(struct virtio_pci_common_cfg, device_status));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION !=
|
|
offsetof(struct virtio_pci_common_cfg, config_generation));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_select));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_size));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_msix_vector));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_enable));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_notify_off));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_desc_lo));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_desc_hi));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_avail_lo));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_avail_hi));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_used_lo));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_used_hi));
|
|
}
|
|
|
|
/*
|
|
* vp_modern_probe: probe the modern virtio pci device, note that the
|
|
* caller is required to enable PCI device before calling this function.
|
|
* @mdev: the modern virtio-pci device
|
|
*
|
|
* Return 0 on succeed otherwise fail
|
|
*/
|
|
int vp_modern_probe(struct virtio_pci_modern_device *mdev)
|
|
{
|
|
struct pci_dev *pci_dev = mdev->pci_dev;
|
|
int err, common, isr, notify, device;
|
|
u32 notify_length;
|
|
u32 notify_offset;
|
|
|
|
check_offsets();
|
|
|
|
mdev->pci_dev = pci_dev;
|
|
|
|
/* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
|
|
if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
|
|
return -ENODEV;
|
|
|
|
if (pci_dev->device < 0x1040) {
|
|
/* Transitional devices: use the PCI subsystem device id as
|
|
* virtio device id, same as legacy driver always did.
|
|
*/
|
|
mdev->id.device = pci_dev->subsystem_device;
|
|
} else {
|
|
/* Modern devices: simply use PCI device id, but start from 0x1040. */
|
|
mdev->id.device = pci_dev->device - 0x1040;
|
|
}
|
|
mdev->id.vendor = pci_dev->subsystem_vendor;
|
|
|
|
/* check for a common config: if not, use legacy mode (bar 0). */
|
|
common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
|
|
IORESOURCE_IO | IORESOURCE_MEM,
|
|
&mdev->modern_bars);
|
|
if (!common) {
|
|
dev_info(&pci_dev->dev,
|
|
"virtio_pci: leaving for legacy driver\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* If common is there, these should be too... */
|
|
isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
|
|
IORESOURCE_IO | IORESOURCE_MEM,
|
|
&mdev->modern_bars);
|
|
notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
|
|
IORESOURCE_IO | IORESOURCE_MEM,
|
|
&mdev->modern_bars);
|
|
if (!isr || !notify) {
|
|
dev_err(&pci_dev->dev,
|
|
"virtio_pci: missing capabilities %i/%i/%i\n",
|
|
common, isr, notify);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64));
|
|
if (err)
|
|
err = dma_set_mask_and_coherent(&pci_dev->dev,
|
|
DMA_BIT_MASK(32));
|
|
if (err)
|
|
dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
|
|
|
|
/* Device capability is only mandatory for devices that have
|
|
* device-specific configuration.
|
|
*/
|
|
device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
|
|
IORESOURCE_IO | IORESOURCE_MEM,
|
|
&mdev->modern_bars);
|
|
|
|
err = pci_request_selected_regions(pci_dev, mdev->modern_bars,
|
|
"virtio-pci-modern");
|
|
if (err)
|
|
return err;
|
|
|
|
err = -EINVAL;
|
|
mdev->common = vp_modern_map_capability(mdev, common,
|
|
sizeof(struct virtio_pci_common_cfg), 4,
|
|
0, sizeof(struct virtio_pci_common_cfg),
|
|
NULL);
|
|
if (!mdev->common)
|
|
goto err_map_common;
|
|
mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1,
|
|
0, 1,
|
|
NULL);
|
|
if (!mdev->isr)
|
|
goto err_map_isr;
|
|
|
|
/* Read notify_off_multiplier from config space. */
|
|
pci_read_config_dword(pci_dev,
|
|
notify + offsetof(struct virtio_pci_notify_cap,
|
|
notify_off_multiplier),
|
|
&mdev->notify_offset_multiplier);
|
|
/* Read notify length and offset from config space. */
|
|
pci_read_config_dword(pci_dev,
|
|
notify + offsetof(struct virtio_pci_notify_cap,
|
|
cap.length),
|
|
¬ify_length);
|
|
|
|
pci_read_config_dword(pci_dev,
|
|
notify + offsetof(struct virtio_pci_notify_cap,
|
|
cap.offset),
|
|
¬ify_offset);
|
|
|
|
/* We don't know how many VQs we'll map, ahead of the time.
|
|
* If notify length is small, map it all now.
|
|
* Otherwise, map each VQ individually later.
|
|
*/
|
|
if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) {
|
|
mdev->notify_base = vp_modern_map_capability(mdev, notify,
|
|
2, 2,
|
|
0, notify_length,
|
|
&mdev->notify_len);
|
|
if (!mdev->notify_base)
|
|
goto err_map_notify;
|
|
} else {
|
|
mdev->notify_map_cap = notify;
|
|
}
|
|
|
|
/* Again, we don't know how much we should map, but PAGE_SIZE
|
|
* is more than enough for all existing devices.
|
|
*/
|
|
if (device) {
|
|
mdev->device = vp_modern_map_capability(mdev, device, 0, 4,
|
|
0, PAGE_SIZE,
|
|
&mdev->device_len);
|
|
if (!mdev->device)
|
|
goto err_map_device;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_map_device:
|
|
if (mdev->notify_base)
|
|
pci_iounmap(pci_dev, mdev->notify_base);
|
|
err_map_notify:
|
|
pci_iounmap(pci_dev, mdev->isr);
|
|
err_map_isr:
|
|
pci_iounmap(pci_dev, mdev->common);
|
|
err_map_common:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_probe);
|
|
|
|
/*
|
|
* vp_modern_probe: remove and cleanup the modern virtio pci device
|
|
* @mdev: the modern virtio-pci device
|
|
*/
|
|
void vp_modern_remove(struct virtio_pci_modern_device *mdev)
|
|
{
|
|
struct pci_dev *pci_dev = mdev->pci_dev;
|
|
|
|
if (mdev->device)
|
|
pci_iounmap(pci_dev, mdev->device);
|
|
if (mdev->notify_base)
|
|
pci_iounmap(pci_dev, mdev->notify_base);
|
|
pci_iounmap(pci_dev, mdev->isr);
|
|
pci_iounmap(pci_dev, mdev->common);
|
|
pci_release_selected_regions(pci_dev, mdev->modern_bars);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_remove);
|
|
|
|
/*
|
|
* vp_modern_get_features - get features from device
|
|
* @mdev: the modern virtio-pci device
|
|
*
|
|
* Returns the features read from the device
|
|
*/
|
|
u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
u64 features;
|
|
|
|
vp_iowrite32(0, &cfg->device_feature_select);
|
|
features = vp_ioread32(&cfg->device_feature);
|
|
vp_iowrite32(1, &cfg->device_feature_select);
|
|
features |= ((u64)vp_ioread32(&cfg->device_feature) << 32);
|
|
|
|
return features;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_get_features);
|
|
|
|
/*
|
|
* vp_modern_set_features - set features to device
|
|
* @mdev: the modern virtio-pci device
|
|
* @features: the features set to device
|
|
*/
|
|
void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
|
|
u64 features)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
vp_iowrite32(0, &cfg->guest_feature_select);
|
|
vp_iowrite32((u32)features, &cfg->guest_feature);
|
|
vp_iowrite32(1, &cfg->guest_feature_select);
|
|
vp_iowrite32(features >> 32, &cfg->guest_feature);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_set_features);
|
|
|
|
/*
|
|
* vp_modern_generation - get the device genreation
|
|
* @mdev: the modern virtio-pci device
|
|
*
|
|
* Returns the genreation read from device
|
|
*/
|
|
u32 vp_modern_generation(struct virtio_pci_modern_device *mdev)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
return vp_ioread8(&cfg->config_generation);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_generation);
|
|
|
|
/*
|
|
* vp_modern_get_status - get the device status
|
|
* @mdev: the modern virtio-pci device
|
|
*
|
|
* Returns the status read from device
|
|
*/
|
|
u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
return vp_ioread8(&cfg->device_status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_get_status);
|
|
|
|
/*
|
|
* vp_modern_set_status - set status to device
|
|
* @mdev: the modern virtio-pci device
|
|
* @status: the status set to device
|
|
*/
|
|
void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
|
|
u8 status)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
vp_iowrite8(status, &cfg->device_status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_set_status);
|
|
|
|
/*
|
|
* vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
|
|
* @mdev: the modern virtio-pci device
|
|
* @index: queue index
|
|
* @vector: the config vector
|
|
*
|
|
* Returns the config vector read from the device
|
|
*/
|
|
u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
|
|
u16 index, u16 vector)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
vp_iowrite16(index, &cfg->queue_select);
|
|
vp_iowrite16(vector, &cfg->queue_msix_vector);
|
|
/* Flush the write out to device */
|
|
return vp_ioread16(&cfg->queue_msix_vector);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_queue_vector);
|
|
|
|
/*
|
|
* vp_modern_config_vector - set the vector for config interrupt
|
|
* @mdev: the modern virtio-pci device
|
|
* @vector: the config vector
|
|
*
|
|
* Returns the config vector read from the device
|
|
*/
|
|
u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
|
|
u16 vector)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
/* Setup the vector used for configuration events */
|
|
vp_iowrite16(vector, &cfg->msix_config);
|
|
/* Verify we had enough resources to assign the vector */
|
|
/* Will also flush the write out to device */
|
|
return vp_ioread16(&cfg->msix_config);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_config_vector);
|
|
|
|
/*
|
|
* vp_modern_queue_address - set the virtqueue address
|
|
* @mdev: the modern virtio-pci device
|
|
* @index: the queue index
|
|
* @desc_addr: address of the descriptor area
|
|
* @driver_addr: address of the driver area
|
|
* @device_addr: address of the device area
|
|
*/
|
|
void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
|
|
u16 index, u64 desc_addr, u64 driver_addr,
|
|
u64 device_addr)
|
|
{
|
|
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
|
|
|
|
vp_iowrite16(index, &cfg->queue_select);
|
|
|
|
vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo,
|
|
&cfg->queue_desc_hi);
|
|
vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo,
|
|
&cfg->queue_avail_hi);
|
|
vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo,
|
|
&cfg->queue_used_hi);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_queue_address);
|
|
|
|
/*
|
|
* vp_modern_set_queue_enable - enable a virtqueue
|
|
* @mdev: the modern virtio-pci device
|
|
* @index: the queue index
|
|
* @enable: whether the virtqueue is enable or not
|
|
*/
|
|
void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
|
|
u16 index, bool enable)
|
|
{
|
|
vp_iowrite16(index, &mdev->common->queue_select);
|
|
vp_iowrite16(enable, &mdev->common->queue_enable);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable);
|
|
|
|
/*
|
|
* vp_modern_get_queue_enable - enable a virtqueue
|
|
* @mdev: the modern virtio-pci device
|
|
* @index: the queue index
|
|
*
|
|
* Returns whether a virtqueue is enabled or not
|
|
*/
|
|
bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
|
|
u16 index)
|
|
{
|
|
vp_iowrite16(index, &mdev->common->queue_select);
|
|
|
|
return vp_ioread16(&mdev->common->queue_enable);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable);
|
|
|
|
/*
|
|
* vp_modern_set_queue_size - set size for a virtqueue
|
|
* @mdev: the modern virtio-pci device
|
|
* @index: the queue index
|
|
* @size: the size of the virtqueue
|
|
*/
|
|
void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
|
|
u16 index, u16 size)
|
|
{
|
|
vp_iowrite16(index, &mdev->common->queue_select);
|
|
vp_iowrite16(size, &mdev->common->queue_size);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_set_queue_size);
|
|
|
|
/*
|
|
* vp_modern_get_queue_size - get size for a virtqueue
|
|
* @mdev: the modern virtio-pci device
|
|
* @index: the queue index
|
|
*
|
|
* Returns the size of the virtqueue
|
|
*/
|
|
u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
|
|
u16 index)
|
|
{
|
|
vp_iowrite16(index, &mdev->common->queue_select);
|
|
|
|
return vp_ioread16(&mdev->common->queue_size);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_get_queue_size);
|
|
|
|
/*
|
|
* vp_modern_get_num_queues - get the number of virtqueues
|
|
* @mdev: the modern virtio-pci device
|
|
*
|
|
* Returns the number of virtqueues
|
|
*/
|
|
u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
|
|
{
|
|
return vp_ioread16(&mdev->common->num_queues);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_get_num_queues);
|
|
|
|
/*
|
|
* vp_modern_get_queue_notify_off - get notification offset for a virtqueue
|
|
* @mdev: the modern virtio-pci device
|
|
* @index: the queue index
|
|
*
|
|
* Returns the notification offset for a virtqueue
|
|
*/
|
|
u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
|
|
u16 index)
|
|
{
|
|
vp_iowrite16(index, &mdev->common->queue_select);
|
|
|
|
return vp_ioread16(&mdev->common->queue_notify_off);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vp_modern_get_queue_notify_off);
|
|
|
|
MODULE_VERSION("0.1");
|
|
MODULE_DESCRIPTION("Modern Virtio PCI Device");
|
|
MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|