mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-13 22:14:20 +08:00
virtio-pci: introduce modern device module
Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20210104065503.199631-17-jasowang@redhat.com Including a bugfix: virtio: don't prompt CONFIG_VIRTIO_PCI_MODERN Cc: Arnd Bergmann <arnd@arndb.de> Cc: Anders Roxell <anders.roxell@linaro.org> Cc: Guenter Roeck <linux@roeck-us.net> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Fixes: 86b87c9d858b6 ("virtio-pci: introduce modern device module") Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20210223061905.422659-2-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
parent
8000a6b602
commit
fd502729fb
@ -12,6 +12,14 @@ config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
|
||||
This option is selected if the architecture may need to enforce
|
||||
VIRTIO_F_ACCESS_PLATFORM
|
||||
|
||||
config VIRTIO_PCI_LIB
|
||||
tristate
|
||||
help
|
||||
Modern PCI device implementation. This module implements the
|
||||
basic probe and control for devices which are based on modern
|
||||
PCI device with possible vendor specific extensions. Any
|
||||
module that selects this module must depend on PCI.
|
||||
|
||||
menuconfig VIRTIO_MENU
|
||||
bool "Virtio drivers"
|
||||
default y
|
||||
@ -21,6 +29,7 @@ if VIRTIO_MENU
|
||||
config VIRTIO_PCI
|
||||
tristate "PCI driver for virtio devices"
|
||||
depends on PCI
|
||||
select VIRTIO_PCI_LIB
|
||||
select VIRTIO
|
||||
help
|
||||
This driver provides support for virtio based paravirtual device
|
||||
|
@ -1,5 +1,6 @@
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o
|
||||
obj-$(CONFIG_VIRTIO_PCI_LIB) += virtio_pci_modern_dev.o
|
||||
obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
|
||||
obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
|
||||
virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o
|
||||
|
@ -25,6 +25,7 @@
|
||||
#include <linux/virtio_config.h>
|
||||
#include <linux/virtio_ring.h>
|
||||
#include <linux/virtio_pci.h>
|
||||
#include <linux/virtio_pci_modern.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/spinlock.h>
|
||||
|
||||
@ -39,32 +40,6 @@ struct virtio_pci_vq_info {
|
||||
unsigned msix_vector;
|
||||
};
|
||||
|
||||
struct virtio_pci_modern_device {
|
||||
struct pci_dev *pci_dev;
|
||||
|
||||
struct virtio_pci_common_cfg __iomem *common;
|
||||
/* Device-specific data (non-legacy mode) */
|
||||
void __iomem *device;
|
||||
/* Base of vq notifications (non-legacy mode). */
|
||||
void __iomem *notify_base;
|
||||
/* Where to read and clear interrupt */
|
||||
u8 __iomem *isr;
|
||||
|
||||
/* So we can sanity-check accesses. */
|
||||
size_t notify_len;
|
||||
size_t device_len;
|
||||
|
||||
/* Capability for when we need to map notifications per-vq. */
|
||||
int notify_map_cap;
|
||||
|
||||
/* Multiply queue_notify_off by this value. (non-legacy mode). */
|
||||
u32 notify_offset_multiplier;
|
||||
|
||||
int modern_bars;
|
||||
|
||||
struct virtio_device_id id;
|
||||
};
|
||||
|
||||
/* Our device structure */
|
||||
struct virtio_pci_device {
|
||||
struct virtio_device vdev;
|
||||
|
@ -19,158 +19,6 @@
|
||||
#define VIRTIO_RING_NO_LEGACY
|
||||
#include "virtio_pci_common.h"
|
||||
|
||||
/*
|
||||
* Type-safe wrappers for io accesses.
|
||||
* Use these to enforce at compile time the following spec requirement:
|
||||
*
|
||||
* The driver MUST access each field using the “natural” access
|
||||
* method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
|
||||
* for 16-bit fields and 8-bit accesses for 8-bit fields.
|
||||
*/
|
||||
static inline u8 vp_ioread8(const u8 __iomem *addr)
|
||||
{
|
||||
return ioread8(addr);
|
||||
}
|
||||
static inline u16 vp_ioread16 (const __le16 __iomem *addr)
|
||||
{
|
||||
return ioread16(addr);
|
||||
}
|
||||
|
||||
static inline u32 vp_ioread32(const __le32 __iomem *addr)
|
||||
{
|
||||
return ioread32(addr);
|
||||
}
|
||||
|
||||
static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
|
||||
{
|
||||
iowrite8(value, addr);
|
||||
}
|
||||
|
||||
static inline void vp_iowrite16(u16 value, __le16 __iomem *addr)
|
||||
{
|
||||
iowrite16(value, addr);
|
||||
}
|
||||
|
||||
static inline void vp_iowrite32(u32 value, __le32 __iomem *addr)
|
||||
{
|
||||
iowrite32(value, addr);
|
||||
}
|
||||
|
||||
static void vp_iowrite64_twopart(u64 val,
|
||||
__le32 __iomem *lo, __le32 __iomem *hi)
|
||||
{
|
||||
vp_iowrite32((u32)val, lo);
|
||||
vp_iowrite32(val >> 32, hi);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
}
|
||||
|
||||
/*
|
||||
* vp_modern_get_features - get features from device
|
||||
* @mdev: the modern virtio-pci device
|
||||
*
|
||||
* Returns the features read from the device
|
||||
*/
|
||||
static 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;
|
||||
}
|
||||
|
||||
/* virtio config->get_features() implementation */
|
||||
static u64 vp_get_features(struct virtio_device *vdev)
|
||||
{
|
||||
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
||||
@ -188,149 +36,6 @@ static void vp_transport_features(struct virtio_device *vdev, u64 features)
|
||||
__virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
|
||||
}
|
||||
|
||||
/*
|
||||
* vp_modern_set_features - set features to device
|
||||
* @mdev: the modern virtio-pci device
|
||||
* @features: the features set to device
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static 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);
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static 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);
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* vp_modern_get_num_queues - get the number of virtqueues
|
||||
* @mdev: the modern virtio-pci device
|
||||
*
|
||||
* Returns the number of virtqueues
|
||||
*/
|
||||
static u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
|
||||
{
|
||||
return vp_ioread16(&mdev->common->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
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
/* virtio config->finalize_features() implementation */
|
||||
static int vp_finalize_features(struct virtio_device *vdev)
|
||||
{
|
||||
@ -429,19 +134,6 @@ static void vp_set(struct virtio_device *vdev, unsigned offset,
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* vp_modern_generation - get the device genreation
|
||||
* @mdev: the modern virtio-pci device
|
||||
*
|
||||
* Returns the genreation read from device
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
static u32 vp_generation(struct virtio_device *vdev)
|
||||
{
|
||||
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
||||
@ -449,19 +141,6 @@ static u32 vp_generation(struct virtio_device *vdev)
|
||||
return vp_modern_generation(&vp_dev->mdev);
|
||||
}
|
||||
|
||||
/*
|
||||
* vp_modern_get_status - get the device status
|
||||
* @mdev: the modern virtio-pci device
|
||||
*
|
||||
* Returns the status read from device
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
/* config->{get,set}_status() implementations */
|
||||
static u8 vp_get_status(struct virtio_device *vdev)
|
||||
{
|
||||
@ -470,19 +149,6 @@ static u8 vp_get_status(struct virtio_device *vdev)
|
||||
return vp_modern_get_status(&vp_dev->mdev);
|
||||
}
|
||||
|
||||
/*
|
||||
* vp_modern_set_status - set status to device
|
||||
* @mdev: the modern virtio-pci device
|
||||
* @status: the status set to device
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
static void vp_set_status(struct virtio_device *vdev, u8 status)
|
||||
{
|
||||
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
||||
@ -510,25 +176,6 @@ static void vp_reset(struct virtio_device *vdev)
|
||||
vp_synchronize_vectors(vdev);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
|
||||
{
|
||||
return vp_modern_config_vector(&vp_dev->mdev, vector);
|
||||
@ -789,253 +436,6 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
|
||||
.get_shm_region = vp_get_shm_region,
|
||||
};
|
||||
|
||||
/**
|
||||
* 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
|
||||
*/
|
||||
static 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;
|
||||
}
|
||||
|
||||
/* the PCI probing function */
|
||||
int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
|
||||
{
|
||||
@ -1063,23 +463,6 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* vp_modern_probe: remove and cleanup the modern virtio pci device
|
||||
* @mdev: the modern virtio-pci device
|
||||
*/
|
||||
static 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);
|
||||
}
|
||||
|
||||
void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev)
|
||||
{
|
||||
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
|
||||
|
599
drivers/virtio/virtio_pci_modern_dev.c
Normal file
599
drivers/virtio/virtio_pci_modern_dev.c
Normal file
@ -0,0 +1,599 @@
|
||||
// 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");
|
111
include/linux/virtio_pci_modern.h
Normal file
111
include/linux/virtio_pci_modern.h
Normal file
@ -0,0 +1,111 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
#ifndef _LINUX_VIRTIO_PCI_MODERN_H
|
||||
#define _LINUX_VIRTIO_PCI_MODERN_H
|
||||
|
||||
#include <linux/pci.h>
|
||||
#include <linux/virtio_pci.h>
|
||||
|
||||
struct virtio_pci_modern_device {
|
||||
struct pci_dev *pci_dev;
|
||||
|
||||
struct virtio_pci_common_cfg __iomem *common;
|
||||
/* Device-specific data (non-legacy mode) */
|
||||
void __iomem *device;
|
||||
/* Base of vq notifications (non-legacy mode). */
|
||||
void __iomem *notify_base;
|
||||
/* Where to read and clear interrupt */
|
||||
u8 __iomem *isr;
|
||||
|
||||
/* So we can sanity-check accesses. */
|
||||
size_t notify_len;
|
||||
size_t device_len;
|
||||
|
||||
/* Capability for when we need to map notifications per-vq. */
|
||||
int notify_map_cap;
|
||||
|
||||
/* Multiply queue_notify_off by this value. (non-legacy mode). */
|
||||
u32 notify_offset_multiplier;
|
||||
|
||||
int modern_bars;
|
||||
|
||||
struct virtio_device_id id;
|
||||
};
|
||||
|
||||
/*
|
||||
* Type-safe wrappers for io accesses.
|
||||
* Use these to enforce at compile time the following spec requirement:
|
||||
*
|
||||
* The driver MUST access each field using the “natural” access
|
||||
* method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
|
||||
* for 16-bit fields and 8-bit accesses for 8-bit fields.
|
||||
*/
|
||||
static inline u8 vp_ioread8(const u8 __iomem *addr)
|
||||
{
|
||||
return ioread8(addr);
|
||||
}
|
||||
static inline u16 vp_ioread16 (const __le16 __iomem *addr)
|
||||
{
|
||||
return ioread16(addr);
|
||||
}
|
||||
|
||||
static inline u32 vp_ioread32(const __le32 __iomem *addr)
|
||||
{
|
||||
return ioread32(addr);
|
||||
}
|
||||
|
||||
static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
|
||||
{
|
||||
iowrite8(value, addr);
|
||||
}
|
||||
|
||||
static inline void vp_iowrite16(u16 value, __le16 __iomem *addr)
|
||||
{
|
||||
iowrite16(value, addr);
|
||||
}
|
||||
|
||||
static inline void vp_iowrite32(u32 value, __le32 __iomem *addr)
|
||||
{
|
||||
iowrite32(value, addr);
|
||||
}
|
||||
|
||||
static inline void vp_iowrite64_twopart(u64 val,
|
||||
__le32 __iomem *lo,
|
||||
__le32 __iomem *hi)
|
||||
{
|
||||
vp_iowrite32((u32)val, lo);
|
||||
vp_iowrite32(val >> 32, hi);
|
||||
}
|
||||
|
||||
u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev);
|
||||
void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
|
||||
u64 features);
|
||||
u32 vp_modern_generation(struct virtio_pci_modern_device *mdev);
|
||||
u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev);
|
||||
void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
|
||||
u8 status);
|
||||
u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
|
||||
u16 idx, u16 vector);
|
||||
u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
|
||||
u16 vector);
|
||||
void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
|
||||
u16 index, u64 desc_addr, u64 driver_addr,
|
||||
u64 device_addr);
|
||||
void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
|
||||
u16 idx, bool enable);
|
||||
bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
|
||||
u16 idx);
|
||||
void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
|
||||
u16 idx, u16 size);
|
||||
u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
|
||||
u16 idx);
|
||||
u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev);
|
||||
u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
|
||||
u16 idx);
|
||||
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);
|
||||
int vp_modern_probe(struct virtio_pci_modern_device *mdev);
|
||||
void vp_modern_remove(struct virtio_pci_modern_device *mdev);
|
||||
#endif
|
Loading…
Reference in New Issue
Block a user