linux_dsm_epyc7002/drivers/gpu/drm/i915/gvt/kvmgt.c
Chuanxiao Dong 08673c3e27 drm/i915/gvt: Revert "drm/i915/gvt: Fix possible recursive locking issue"
This reverts commit 62d02fd1f8.

The rwsem recursive trace should not be fixed from kvmgt side by using
a workqueue and it is an issue should be fixed in VFIO. So this one
should be reverted.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2017-07-11 13:46:58 +08:00

1533 lines
35 KiB
C

/*
* KVMGT - the implementation of Intel mediated pass-through framework for KVM
*
* Copyright(c) 2014-2016 Intel Corporation. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Kevin Tian <kevin.tian@intel.com>
* Jike Song <jike.song@intel.com>
* Xiaoguang Chen <xiaoguang.chen@intel.com>
*/
#include <linux/init.h>
#include <linux/device.h>
#include <linux/mm.h>
#include <linux/mmu_context.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/eventfd.h>
#include <linux/uuid.h>
#include <linux/kvm_host.h>
#include <linux/vfio.h>
#include <linux/mdev.h>
#include "i915_drv.h"
#include "gvt.h"
static const struct intel_gvt_ops *intel_gvt_ops;
/* helper macros copied from vfio-pci */
#define VFIO_PCI_OFFSET_SHIFT 40
#define VFIO_PCI_OFFSET_TO_INDEX(off) (off >> VFIO_PCI_OFFSET_SHIFT)
#define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
#define VFIO_PCI_OFFSET_MASK (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
struct vfio_region {
u32 type;
u32 subtype;
size_t size;
u32 flags;
};
struct kvmgt_pgfn {
gfn_t gfn;
struct hlist_node hnode;
};
struct kvmgt_guest_info {
struct kvm *kvm;
struct intel_vgpu *vgpu;
struct kvm_page_track_notifier_node track_node;
#define NR_BKT (1 << 18)
struct hlist_head ptable[NR_BKT];
#undef NR_BKT
};
struct gvt_dma {
struct rb_node node;
gfn_t gfn;
unsigned long iova;
};
static inline bool handle_valid(unsigned long handle)
{
return !!(handle & ~0xff);
}
static int kvmgt_guest_init(struct mdev_device *mdev);
static void intel_vgpu_release_work(struct work_struct *work);
static bool kvmgt_guest_exit(struct kvmgt_guest_info *info);
static int gvt_dma_map_iova(struct intel_vgpu *vgpu, kvm_pfn_t pfn,
unsigned long *iova)
{
struct page *page;
struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
dma_addr_t daddr;
if (unlikely(!pfn_valid(pfn)))
return -EFAULT;
page = pfn_to_page(pfn);
daddr = dma_map_page(dev, page, 0, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, daddr))
return -ENOMEM;
*iova = (unsigned long)(daddr >> PAGE_SHIFT);
return 0;
}
static void gvt_dma_unmap_iova(struct intel_vgpu *vgpu, unsigned long iova)
{
struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
dma_addr_t daddr;
daddr = (dma_addr_t)(iova << PAGE_SHIFT);
dma_unmap_page(dev, daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
}
static struct gvt_dma *__gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)
{
struct rb_node *node = vgpu->vdev.cache.rb_node;
struct gvt_dma *ret = NULL;
while (node) {
struct gvt_dma *itr = rb_entry(node, struct gvt_dma, node);
if (gfn < itr->gfn)
node = node->rb_left;
else if (gfn > itr->gfn)
node = node->rb_right;
else {
ret = itr;
goto out;
}
}
out:
return ret;
}
static unsigned long gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)
{
struct gvt_dma *entry;
unsigned long iova;
mutex_lock(&vgpu->vdev.cache_lock);
entry = __gvt_cache_find(vgpu, gfn);
iova = (entry == NULL) ? INTEL_GVT_INVALID_ADDR : entry->iova;
mutex_unlock(&vgpu->vdev.cache_lock);
return iova;
}
static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
unsigned long iova)
{
struct gvt_dma *new, *itr;
struct rb_node **link = &vgpu->vdev.cache.rb_node, *parent = NULL;
new = kzalloc(sizeof(struct gvt_dma), GFP_KERNEL);
if (!new)
return;
new->gfn = gfn;
new->iova = iova;
mutex_lock(&vgpu->vdev.cache_lock);
while (*link) {
parent = *link;
itr = rb_entry(parent, struct gvt_dma, node);
if (gfn == itr->gfn)
goto out;
else if (gfn < itr->gfn)
link = &parent->rb_left;
else
link = &parent->rb_right;
}
rb_link_node(&new->node, parent, link);
rb_insert_color(&new->node, &vgpu->vdev.cache);
mutex_unlock(&vgpu->vdev.cache_lock);
return;
out:
mutex_unlock(&vgpu->vdev.cache_lock);
kfree(new);
}
static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
struct gvt_dma *entry)
{
rb_erase(&entry->node, &vgpu->vdev.cache);
kfree(entry);
}
static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn)
{
struct device *dev = mdev_dev(vgpu->vdev.mdev);
struct gvt_dma *this;
unsigned long g1;
int rc;
mutex_lock(&vgpu->vdev.cache_lock);
this = __gvt_cache_find(vgpu, gfn);
if (!this) {
mutex_unlock(&vgpu->vdev.cache_lock);
return;
}
g1 = gfn;
gvt_dma_unmap_iova(vgpu, this->iova);
rc = vfio_unpin_pages(dev, &g1, 1);
WARN_ON(rc != 1);
__gvt_cache_remove_entry(vgpu, this);
mutex_unlock(&vgpu->vdev.cache_lock);
}
static void gvt_cache_init(struct intel_vgpu *vgpu)
{
vgpu->vdev.cache = RB_ROOT;
mutex_init(&vgpu->vdev.cache_lock);
}
static void gvt_cache_destroy(struct intel_vgpu *vgpu)
{
struct gvt_dma *dma;
struct rb_node *node = NULL;
struct device *dev = mdev_dev(vgpu->vdev.mdev);
unsigned long gfn;
for (;;) {
mutex_lock(&vgpu->vdev.cache_lock);
node = rb_first(&vgpu->vdev.cache);
if (!node) {
mutex_unlock(&vgpu->vdev.cache_lock);
break;
}
dma = rb_entry(node, struct gvt_dma, node);
gvt_dma_unmap_iova(vgpu, dma->iova);
gfn = dma->gfn;
__gvt_cache_remove_entry(vgpu, dma);
mutex_unlock(&vgpu->vdev.cache_lock);
vfio_unpin_pages(dev, &gfn, 1);
}
}
static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
const char *name)
{
int i;
struct intel_vgpu_type *t;
const char *driver_name = dev_driver_string(
&gvt->dev_priv->drm.pdev->dev);
for (i = 0; i < gvt->num_types; i++) {
t = &gvt->types[i];
if (!strncmp(t->name, name + strlen(driver_name) + 1,
sizeof(t->name)))
return t;
}
return NULL;
}
static ssize_t available_instances_show(struct kobject *kobj,
struct device *dev, char *buf)
{
struct intel_vgpu_type *type;
unsigned int num = 0;
void *gvt = kdev_to_i915(dev)->gvt;
type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
if (!type)
num = 0;
else
num = type->avail_instance;
return sprintf(buf, "%u\n", num);
}
static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
char *buf)
{
return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
}
static ssize_t description_show(struct kobject *kobj, struct device *dev,
char *buf)
{
struct intel_vgpu_type *type;
void *gvt = kdev_to_i915(dev)->gvt;
type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
if (!type)
return 0;
return sprintf(buf, "low_gm_size: %dMB\nhigh_gm_size: %dMB\n"
"fence: %d\nresolution: %s\n"
"weight: %d\n",
BYTES_TO_MB(type->low_gm_size),
BYTES_TO_MB(type->high_gm_size),
type->fence, vgpu_edid_str(type->resolution),
type->weight);
}
static MDEV_TYPE_ATTR_RO(available_instances);
static MDEV_TYPE_ATTR_RO(device_api);
static MDEV_TYPE_ATTR_RO(description);
static struct attribute *type_attrs[] = {
&mdev_type_attr_available_instances.attr,
&mdev_type_attr_device_api.attr,
&mdev_type_attr_description.attr,
NULL,
};
static struct attribute_group *intel_vgpu_type_groups[] = {
[0 ... NR_MAX_INTEL_VGPU_TYPES - 1] = NULL,
};
static bool intel_gvt_init_vgpu_type_groups(struct intel_gvt *gvt)
{
int i, j;
struct intel_vgpu_type *type;
struct attribute_group *group;
for (i = 0; i < gvt->num_types; i++) {
type = &gvt->types[i];
group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
if (WARN_ON(!group))
goto unwind;
group->name = type->name;
group->attrs = type_attrs;
intel_vgpu_type_groups[i] = group;
}
return true;
unwind:
for (j = 0; j < i; j++) {
group = intel_vgpu_type_groups[j];
kfree(group);
}
return false;
}
static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
{
int i;
struct attribute_group *group;
for (i = 0; i < gvt->num_types; i++) {
group = intel_vgpu_type_groups[i];
kfree(group);
}
}
static void kvmgt_protect_table_init(struct kvmgt_guest_info *info)
{
hash_init(info->ptable);
}
static void kvmgt_protect_table_destroy(struct kvmgt_guest_info *info)
{
struct kvmgt_pgfn *p;
struct hlist_node *tmp;
int i;
hash_for_each_safe(info->ptable, i, tmp, p, hnode) {
hash_del(&p->hnode);
kfree(p);
}
}
static struct kvmgt_pgfn *
__kvmgt_protect_table_find(struct kvmgt_guest_info *info, gfn_t gfn)
{
struct kvmgt_pgfn *p, *res = NULL;
hash_for_each_possible(info->ptable, p, hnode, gfn) {
if (gfn == p->gfn) {
res = p;
break;
}
}
return res;
}
static bool kvmgt_gfn_is_write_protected(struct kvmgt_guest_info *info,
gfn_t gfn)
{
struct kvmgt_pgfn *p;
p = __kvmgt_protect_table_find(info, gfn);
return !!p;
}
static void kvmgt_protect_table_add(struct kvmgt_guest_info *info, gfn_t gfn)
{
struct kvmgt_pgfn *p;
if (kvmgt_gfn_is_write_protected(info, gfn))
return;
p = kzalloc(sizeof(struct kvmgt_pgfn), GFP_ATOMIC);
if (WARN(!p, "gfn: 0x%llx\n", gfn))
return;
p->gfn = gfn;
hash_add(info->ptable, &p->hnode, gfn);
}
static void kvmgt_protect_table_del(struct kvmgt_guest_info *info,
gfn_t gfn)
{
struct kvmgt_pgfn *p;
p = __kvmgt_protect_table_find(info, gfn);
if (p) {
hash_del(&p->hnode);
kfree(p);
}
}
static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
{
struct intel_vgpu *vgpu = NULL;
struct intel_vgpu_type *type;
struct device *pdev;
void *gvt;
int ret;
pdev = mdev_parent_dev(mdev);
gvt = kdev_to_i915(pdev)->gvt;
type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
if (!type) {
gvt_vgpu_err("failed to find type %s to create\n",
kobject_name(kobj));
ret = -EINVAL;
goto out;
}
vgpu = intel_gvt_ops->vgpu_create(gvt, type);
if (IS_ERR_OR_NULL(vgpu)) {
ret = vgpu == NULL ? -EFAULT : PTR_ERR(vgpu);
gvt_vgpu_err("failed to create intel vgpu: %d\n", ret);
goto out;
}
INIT_WORK(&vgpu->vdev.release_work, intel_vgpu_release_work);
vgpu->vdev.mdev = mdev;
mdev_set_drvdata(mdev, vgpu);
gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
dev_name(mdev_dev(mdev)));
ret = 0;
out:
return ret;
}
static int intel_vgpu_remove(struct mdev_device *mdev)
{
struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
if (handle_valid(vgpu->handle))
return -EBUSY;
intel_gvt_ops->vgpu_destroy(vgpu);
return 0;
}
static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct intel_vgpu *vgpu = container_of(nb,
struct intel_vgpu,
vdev.iommu_notifier);
if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
struct vfio_iommu_type1_dma_unmap *unmap = data;
unsigned long gfn, end_gfn;
gfn = unmap->iova >> PAGE_SHIFT;
end_gfn = gfn + unmap->size / PAGE_SIZE;
while (gfn < end_gfn)
gvt_cache_remove(vgpu, gfn++);
}
return NOTIFY_OK;
}
static int intel_vgpu_group_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct intel_vgpu *vgpu = container_of(nb,
struct intel_vgpu,
vdev.group_notifier);
/* the only action we care about */
if (action == VFIO_GROUP_NOTIFY_SET_KVM) {
vgpu->vdev.kvm = data;
if (!data)
schedule_work(&vgpu->vdev.release_work);
}
return NOTIFY_OK;
}
static int intel_vgpu_open(struct mdev_device *mdev)
{
struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
unsigned long events;
int ret;
vgpu->vdev.iommu_notifier.notifier_call = intel_vgpu_iommu_notifier;
vgpu->vdev.group_notifier.notifier_call = intel_vgpu_group_notifier;
events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, &events,
&vgpu->vdev.iommu_notifier);
if (ret != 0) {
gvt_vgpu_err("vfio_register_notifier for iommu failed: %d\n",
ret);
goto out;
}
events = VFIO_GROUP_NOTIFY_SET_KVM;
ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
&vgpu->vdev.group_notifier);
if (ret != 0) {
gvt_vgpu_err("vfio_register_notifier for group failed: %d\n",
ret);
goto undo_iommu;
}
ret = kvmgt_guest_init(mdev);
if (ret)
goto undo_group;
intel_gvt_ops->vgpu_activate(vgpu);
atomic_set(&vgpu->vdev.released, 0);
return ret;
undo_group:
vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
&vgpu->vdev.group_notifier);
undo_iommu:
vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
&vgpu->vdev.iommu_notifier);
out:
return ret;
}
static void __intel_vgpu_release(struct intel_vgpu *vgpu)
{
struct kvmgt_guest_info *info;
int ret;
if (!handle_valid(vgpu->handle))
return;
if (atomic_cmpxchg(&vgpu->vdev.released, 0, 1))
return;
intel_gvt_ops->vgpu_deactivate(vgpu);
ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
&vgpu->vdev.iommu_notifier);
WARN(ret, "vfio_unregister_notifier for iommu failed: %d\n", ret);
ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_GROUP_NOTIFY,
&vgpu->vdev.group_notifier);
WARN(ret, "vfio_unregister_notifier for group failed: %d\n", ret);
info = (struct kvmgt_guest_info *)vgpu->handle;
kvmgt_guest_exit(info);
vgpu->vdev.kvm = NULL;
vgpu->handle = 0;
}
static void intel_vgpu_release(struct mdev_device *mdev)
{
struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
__intel_vgpu_release(vgpu);
}
static void intel_vgpu_release_work(struct work_struct *work)
{
struct intel_vgpu *vgpu = container_of(work, struct intel_vgpu,
vdev.release_work);
__intel_vgpu_release(vgpu);
}
static uint64_t intel_vgpu_get_bar0_addr(struct intel_vgpu *vgpu)
{
u32 start_lo, start_hi;
u32 mem_type;
int pos = PCI_BASE_ADDRESS_0;
start_lo = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + pos)) &
PCI_BASE_ADDRESS_MEM_MASK;
mem_type = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + pos)) &
PCI_BASE_ADDRESS_MEM_TYPE_MASK;
switch (mem_type) {
case PCI_BASE_ADDRESS_MEM_TYPE_64:
start_hi = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space
+ pos + 4));
break;
case PCI_BASE_ADDRESS_MEM_TYPE_32:
case PCI_BASE_ADDRESS_MEM_TYPE_1M:
/* 1M mem BAR treated as 32-bit BAR */
default:
/* mem unknown type treated as 32-bit BAR */
start_hi = 0;
break;
}
return ((u64)start_hi << 32) | start_lo;
}
static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
size_t count, loff_t *ppos, bool is_write)
{
struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
uint64_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
int ret = -EINVAL;
if (index >= VFIO_PCI_NUM_REGIONS) {
gvt_vgpu_err("invalid index: %u\n", index);
return -EINVAL;
}
switch (index) {
case VFIO_PCI_CONFIG_REGION_INDEX:
if (is_write)
ret = intel_gvt_ops->emulate_cfg_write(vgpu, pos,
buf, count);
else
ret = intel_gvt_ops->emulate_cfg_read(vgpu, pos,
buf, count);
break;
case VFIO_PCI_BAR0_REGION_INDEX:
case VFIO_PCI_BAR1_REGION_INDEX:
if (is_write) {
uint64_t bar0_start = intel_vgpu_get_bar0_addr(vgpu);
ret = intel_gvt_ops->emulate_mmio_write(vgpu,
bar0_start + pos, buf, count);
} else {
uint64_t bar0_start = intel_vgpu_get_bar0_addr(vgpu);
ret = intel_gvt_ops->emulate_mmio_read(vgpu,
bar0_start + pos, buf, count);
}
break;
case VFIO_PCI_BAR2_REGION_INDEX:
case VFIO_PCI_BAR3_REGION_INDEX:
case VFIO_PCI_BAR4_REGION_INDEX:
case VFIO_PCI_BAR5_REGION_INDEX:
case VFIO_PCI_VGA_REGION_INDEX:
case VFIO_PCI_ROM_REGION_INDEX:
default:
gvt_vgpu_err("unsupported region: %u\n", index);
}
return ret == 0 ? count : ret;
}
static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
size_t count, loff_t *ppos)
{
unsigned int done = 0;
int ret;
while (count) {
size_t filled;
if (count >= 4 && !(*ppos % 4)) {
u32 val;
ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
ppos, false);
if (ret <= 0)
goto read_err;
if (copy_to_user(buf, &val, sizeof(val)))
goto read_err;
filled = 4;
} else if (count >= 2 && !(*ppos % 2)) {
u16 val;
ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
ppos, false);
if (ret <= 0)
goto read_err;
if (copy_to_user(buf, &val, sizeof(val)))
goto read_err;
filled = 2;
} else {
u8 val;
ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
false);
if (ret <= 0)
goto read_err;
if (copy_to_user(buf, &val, sizeof(val)))
goto read_err;
filled = 1;
}
count -= filled;
done += filled;
*ppos += filled;
buf += filled;
}
return done;
read_err:
return -EFAULT;
}
static ssize_t intel_vgpu_write(struct mdev_device *mdev,
const char __user *buf,
size_t count, loff_t *ppos)
{
unsigned int done = 0;
int ret;
while (count) {
size_t filled;
if (count >= 4 && !(*ppos % 4)) {
u32 val;
if (copy_from_user(&val, buf, sizeof(val)))
goto write_err;
ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
ppos, true);
if (ret <= 0)
goto write_err;
filled = 4;
} else if (count >= 2 && !(*ppos % 2)) {
u16 val;
if (copy_from_user(&val, buf, sizeof(val)))
goto write_err;
ret = intel_vgpu_rw(mdev, (char *)&val,
sizeof(val), ppos, true);
if (ret <= 0)
goto write_err;
filled = 2;
} else {
u8 val;
if (copy_from_user(&val, buf, sizeof(val)))
goto write_err;
ret = intel_vgpu_rw(mdev, &val, sizeof(val),
ppos, true);
if (ret <= 0)
goto write_err;
filled = 1;
}
count -= filled;
done += filled;
*ppos += filled;
buf += filled;
}
return done;
write_err:
return -EFAULT;
}
static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
{
unsigned int index;
u64 virtaddr;
unsigned long req_size, pgoff = 0;
pgprot_t pg_prot;
struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
if (index >= VFIO_PCI_ROM_REGION_INDEX)
return -EINVAL;
if (vma->vm_end < vma->vm_start)
return -EINVAL;
if ((vma->vm_flags & VM_SHARED) == 0)
return -EINVAL;
if (index != VFIO_PCI_BAR2_REGION_INDEX)
return -EINVAL;
pg_prot = vma->vm_page_prot;
virtaddr = vma->vm_start;
req_size = vma->vm_end - vma->vm_start;
pgoff = vgpu_aperture_pa_base(vgpu) >> PAGE_SHIFT;
return remap_pfn_range(vma, virtaddr, pgoff, req_size, pg_prot);
}
static int intel_vgpu_get_irq_count(struct intel_vgpu *vgpu, int type)
{
if (type == VFIO_PCI_INTX_IRQ_INDEX || type == VFIO_PCI_MSI_IRQ_INDEX)
return 1;
return 0;
}
static int intel_vgpu_set_intx_mask(struct intel_vgpu *vgpu,
unsigned int index, unsigned int start,
unsigned int count, uint32_t flags,
void *data)
{
return 0;
}
static int intel_vgpu_set_intx_unmask(struct intel_vgpu *vgpu,
unsigned int index, unsigned int start,
unsigned int count, uint32_t flags, void *data)
{
return 0;
}
static int intel_vgpu_set_intx_trigger(struct intel_vgpu *vgpu,
unsigned int index, unsigned int start, unsigned int count,
uint32_t flags, void *data)
{
return 0;
}
static int intel_vgpu_set_msi_trigger(struct intel_vgpu *vgpu,
unsigned int index, unsigned int start, unsigned int count,
uint32_t flags, void *data)
{
struct eventfd_ctx *trigger;
if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
int fd = *(int *)data;
trigger = eventfd_ctx_fdget(fd);
if (IS_ERR(trigger)) {
gvt_vgpu_err("eventfd_ctx_fdget failed\n");
return PTR_ERR(trigger);
}
vgpu->vdev.msi_trigger = trigger;
}
return 0;
}
static int intel_vgpu_set_irqs(struct intel_vgpu *vgpu, uint32_t flags,
unsigned int index, unsigned int start, unsigned int count,
void *data)
{
int (*func)(struct intel_vgpu *vgpu, unsigned int index,
unsigned int start, unsigned int count, uint32_t flags,
void *data) = NULL;
switch (index) {
case VFIO_PCI_INTX_IRQ_INDEX:
switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
case VFIO_IRQ_SET_ACTION_MASK:
func = intel_vgpu_set_intx_mask;
break;
case VFIO_IRQ_SET_ACTION_UNMASK:
func = intel_vgpu_set_intx_unmask;
break;
case VFIO_IRQ_SET_ACTION_TRIGGER:
func = intel_vgpu_set_intx_trigger;
break;
}
break;
case VFIO_PCI_MSI_IRQ_INDEX:
switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
case VFIO_IRQ_SET_ACTION_MASK:
case VFIO_IRQ_SET_ACTION_UNMASK:
/* XXX Need masking support exported */
break;
case VFIO_IRQ_SET_ACTION_TRIGGER:
func = intel_vgpu_set_msi_trigger;
break;
}
break;
}
if (!func)
return -ENOTTY;
return func(vgpu, index, start, count, flags, data);
}
static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
unsigned long arg)
{
struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
unsigned long minsz;
gvt_dbg_core("vgpu%d ioctl, cmd: %d\n", vgpu->id, cmd);
if (cmd == VFIO_DEVICE_GET_INFO) {
struct vfio_device_info info;
minsz = offsetofend(struct vfio_device_info, num_irqs);
if (copy_from_user(&info, (void __user *)arg, minsz))
return -EFAULT;
if (info.argsz < minsz)
return -EINVAL;
info.flags = VFIO_DEVICE_FLAGS_PCI;
info.flags |= VFIO_DEVICE_FLAGS_RESET;
info.num_regions = VFIO_PCI_NUM_REGIONS;
info.num_irqs = VFIO_PCI_NUM_IRQS;
return copy_to_user((void __user *)arg, &info, minsz) ?
-EFAULT : 0;
} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
struct vfio_region_info info;
struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
int i, ret;
struct vfio_region_info_cap_sparse_mmap *sparse = NULL;
size_t size;
int nr_areas = 1;
int cap_type_id;
minsz = offsetofend(struct vfio_region_info, offset);
if (copy_from_user(&info, (void __user *)arg, minsz))
return -EFAULT;
if (info.argsz < minsz)
return -EINVAL;
switch (info.index) {
case VFIO_PCI_CONFIG_REGION_INDEX:
info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
info.size = INTEL_GVT_MAX_CFG_SPACE_SZ;
info.flags = VFIO_REGION_INFO_FLAG_READ |
VFIO_REGION_INFO_FLAG_WRITE;
break;
case VFIO_PCI_BAR0_REGION_INDEX:
info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
info.size = vgpu->cfg_space.bar[info.index].size;
if (!info.size) {
info.flags = 0;
break;
}
info.flags = VFIO_REGION_INFO_FLAG_READ |
VFIO_REGION_INFO_FLAG_WRITE;
break;
case VFIO_PCI_BAR1_REGION_INDEX:
info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
info.size = 0;
info.flags = 0;
break;
case VFIO_PCI_BAR2_REGION_INDEX:
info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
info.flags = VFIO_REGION_INFO_FLAG_CAPS |
VFIO_REGION_INFO_FLAG_MMAP |
VFIO_REGION_INFO_FLAG_READ |
VFIO_REGION_INFO_FLAG_WRITE;
info.size = gvt_aperture_sz(vgpu->gvt);
size = sizeof(*sparse) +
(nr_areas * sizeof(*sparse->areas));
sparse = kzalloc(size, GFP_KERNEL);
if (!sparse)
return -ENOMEM;
sparse->nr_areas = nr_areas;
cap_type_id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
sparse->areas[0].offset =
PAGE_ALIGN(vgpu_aperture_offset(vgpu));
sparse->areas[0].size = vgpu_aperture_sz(vgpu);
break;
case VFIO_PCI_BAR3_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
info.size = 0;
info.flags = 0;
gvt_dbg_core("get region info bar:%d\n", info.index);
break;
case VFIO_PCI_ROM_REGION_INDEX:
case VFIO_PCI_VGA_REGION_INDEX:
gvt_dbg_core("get region info index:%d\n", info.index);
break;
default:
{
struct vfio_region_info_cap_type cap_type;
if (info.index >= VFIO_PCI_NUM_REGIONS +
vgpu->vdev.num_regions)
return -EINVAL;
i = info.index - VFIO_PCI_NUM_REGIONS;
info.offset =
VFIO_PCI_INDEX_TO_OFFSET(info.index);
info.size = vgpu->vdev.region[i].size;
info.flags = vgpu->vdev.region[i].flags;
cap_type.type = vgpu->vdev.region[i].type;
cap_type.subtype = vgpu->vdev.region[i].subtype;
ret = vfio_info_add_capability(&caps,
VFIO_REGION_INFO_CAP_TYPE,
&cap_type);
if (ret)
return ret;
}
}
if ((info.flags & VFIO_REGION_INFO_FLAG_CAPS) && sparse) {
switch (cap_type_id) {
case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
ret = vfio_info_add_capability(&caps,
VFIO_REGION_INFO_CAP_SPARSE_MMAP,
sparse);
kfree(sparse);
if (ret)
return ret;
break;
default:
return -EINVAL;
}
}
if (caps.size) {
if (info.argsz < sizeof(info) + caps.size) {
info.argsz = sizeof(info) + caps.size;
info.cap_offset = 0;
} else {
vfio_info_cap_shift(&caps, sizeof(info));
if (copy_to_user((void __user *)arg +
sizeof(info), caps.buf,
caps.size)) {
kfree(caps.buf);
return -EFAULT;
}
info.cap_offset = sizeof(info);
}
kfree(caps.buf);
}
return copy_to_user((void __user *)arg, &info, minsz) ?
-EFAULT : 0;
} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
struct vfio_irq_info info;
minsz = offsetofend(struct vfio_irq_info, count);
if (copy_from_user(&info, (void __user *)arg, minsz))
return -EFAULT;
if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
return -EINVAL;
switch (info.index) {
case VFIO_PCI_INTX_IRQ_INDEX:
case VFIO_PCI_MSI_IRQ_INDEX:
break;
default:
return -EINVAL;
}
info.flags = VFIO_IRQ_INFO_EVENTFD;
info.count = intel_vgpu_get_irq_count(vgpu, info.index);
if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
info.flags |= (VFIO_IRQ_INFO_MASKABLE |
VFIO_IRQ_INFO_AUTOMASKED);
else
info.flags |= VFIO_IRQ_INFO_NORESIZE;
return copy_to_user((void __user *)arg, &info, minsz) ?
-EFAULT : 0;
} else if (cmd == VFIO_DEVICE_SET_IRQS) {
struct vfio_irq_set hdr;
u8 *data = NULL;
int ret = 0;
size_t data_size = 0;
minsz = offsetofend(struct vfio_irq_set, count);
if (copy_from_user(&hdr, (void __user *)arg, minsz))
return -EFAULT;
if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
int max = intel_vgpu_get_irq_count(vgpu, hdr.index);
ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
VFIO_PCI_NUM_IRQS, &data_size);
if (ret) {
gvt_vgpu_err("intel:vfio_set_irqs_validate_and_prepare failed\n");
return -EINVAL;
}
if (data_size) {
data = memdup_user((void __user *)(arg + minsz),
data_size);
if (IS_ERR(data))
return PTR_ERR(data);
}
}
ret = intel_vgpu_set_irqs(vgpu, hdr.flags, hdr.index,
hdr.start, hdr.count, data);
kfree(data);
return ret;
} else if (cmd == VFIO_DEVICE_RESET) {
intel_gvt_ops->vgpu_reset(vgpu);
return 0;
}
return 0;
}
static ssize_t
vgpu_id_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mdev_device *mdev = mdev_from_dev(dev);
if (mdev) {
struct intel_vgpu *vgpu = (struct intel_vgpu *)
mdev_get_drvdata(mdev);
return sprintf(buf, "%d\n", vgpu->id);
}
return sprintf(buf, "\n");
}
static DEVICE_ATTR_RO(vgpu_id);
static struct attribute *intel_vgpu_attrs[] = {
&dev_attr_vgpu_id.attr,
NULL
};
static const struct attribute_group intel_vgpu_group = {
.name = "intel_vgpu",
.attrs = intel_vgpu_attrs,
};
static const struct attribute_group *intel_vgpu_groups[] = {
&intel_vgpu_group,
NULL,
};
static const struct mdev_parent_ops intel_vgpu_ops = {
.supported_type_groups = intel_vgpu_type_groups,
.mdev_attr_groups = intel_vgpu_groups,
.create = intel_vgpu_create,
.remove = intel_vgpu_remove,
.open = intel_vgpu_open,
.release = intel_vgpu_release,
.read = intel_vgpu_read,
.write = intel_vgpu_write,
.mmap = intel_vgpu_mmap,
.ioctl = intel_vgpu_ioctl,
};
static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
{
if (!intel_gvt_init_vgpu_type_groups(gvt))
return -EFAULT;
intel_gvt_ops = ops;
return mdev_register_device(dev, &intel_vgpu_ops);
}
static void kvmgt_host_exit(struct device *dev, void *gvt)
{
intel_gvt_cleanup_vgpu_type_groups(gvt);
mdev_unregister_device(dev);
}
static int kvmgt_write_protect_add(unsigned long handle, u64 gfn)
{
struct kvmgt_guest_info *info;
struct kvm *kvm;
struct kvm_memory_slot *slot;
int idx;
if (!handle_valid(handle))
return -ESRCH;
info = (struct kvmgt_guest_info *)handle;
kvm = info->kvm;
idx = srcu_read_lock(&kvm->srcu);
slot = gfn_to_memslot(kvm, gfn);
if (!slot) {
srcu_read_unlock(&kvm->srcu, idx);
return -EINVAL;
}
spin_lock(&kvm->mmu_lock);
if (kvmgt_gfn_is_write_protected(info, gfn))
goto out;
kvm_slot_page_track_add_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
kvmgt_protect_table_add(info, gfn);
out:
spin_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);
return 0;
}
static int kvmgt_write_protect_remove(unsigned long handle, u64 gfn)
{
struct kvmgt_guest_info *info;
struct kvm *kvm;
struct kvm_memory_slot *slot;
int idx;
if (!handle_valid(handle))
return 0;
info = (struct kvmgt_guest_info *)handle;
kvm = info->kvm;
idx = srcu_read_lock(&kvm->srcu);
slot = gfn_to_memslot(kvm, gfn);
if (!slot) {
srcu_read_unlock(&kvm->srcu, idx);
return -EINVAL;
}
spin_lock(&kvm->mmu_lock);
if (!kvmgt_gfn_is_write_protected(info, gfn))
goto out;
kvm_slot_page_track_remove_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
kvmgt_protect_table_del(info, gfn);
out:
spin_unlock(&kvm->mmu_lock);
srcu_read_unlock(&kvm->srcu, idx);
return 0;
}
static void kvmgt_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa,
const u8 *val, int len,
struct kvm_page_track_notifier_node *node)
{
struct kvmgt_guest_info *info = container_of(node,
struct kvmgt_guest_info, track_node);
if (kvmgt_gfn_is_write_protected(info, gpa_to_gfn(gpa)))
intel_gvt_ops->emulate_mmio_write(info->vgpu, gpa,
(void *)val, len);
}
static void kvmgt_page_track_flush_slot(struct kvm *kvm,
struct kvm_memory_slot *slot,
struct kvm_page_track_notifier_node *node)
{
int i;
gfn_t gfn;
struct kvmgt_guest_info *info = container_of(node,
struct kvmgt_guest_info, track_node);
spin_lock(&kvm->mmu_lock);
for (i = 0; i < slot->npages; i++) {
gfn = slot->base_gfn + i;
if (kvmgt_gfn_is_write_protected(info, gfn)) {
kvm_slot_page_track_remove_page(kvm, slot, gfn,
KVM_PAGE_TRACK_WRITE);
kvmgt_protect_table_del(info, gfn);
}
}
spin_unlock(&kvm->mmu_lock);
}
static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
{
struct intel_vgpu *itr;
struct kvmgt_guest_info *info;
int id;
bool ret = false;
mutex_lock(&vgpu->gvt->lock);
for_each_active_vgpu(vgpu->gvt, itr, id) {
if (!handle_valid(itr->handle))
continue;
info = (struct kvmgt_guest_info *)itr->handle;
if (kvm && kvm == info->kvm) {
ret = true;
goto out;
}
}
out:
mutex_unlock(&vgpu->gvt->lock);
return ret;
}
static int kvmgt_guest_init(struct mdev_device *mdev)
{
struct kvmgt_guest_info *info;
struct intel_vgpu *vgpu;
struct kvm *kvm;
vgpu = mdev_get_drvdata(mdev);
if (handle_valid(vgpu->handle))
return -EEXIST;
kvm = vgpu->vdev.kvm;
if (!kvm || kvm->mm != current->mm) {
gvt_vgpu_err("KVM is required to use Intel vGPU\n");
return -ESRCH;
}
if (__kvmgt_vgpu_exist(vgpu, kvm))
return -EEXIST;
info = vzalloc(sizeof(struct kvmgt_guest_info));
if (!info)
return -ENOMEM;
vgpu->handle = (unsigned long)info;
info->vgpu = vgpu;
info->kvm = kvm;
kvm_get_kvm(info->kvm);
kvmgt_protect_table_init(info);
gvt_cache_init(vgpu);
info->track_node.track_write = kvmgt_page_track_write;
info->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
kvm_page_track_register_notifier(kvm, &info->track_node);
return 0;
}
static bool kvmgt_guest_exit(struct kvmgt_guest_info *info)
{
kvm_page_track_unregister_notifier(info->kvm, &info->track_node);
kvm_put_kvm(info->kvm);
kvmgt_protect_table_destroy(info);
gvt_cache_destroy(info->vgpu);
vfree(info);
return true;
}
static int kvmgt_attach_vgpu(void *vgpu, unsigned long *handle)
{
/* nothing to do here */
return 0;
}
static void kvmgt_detach_vgpu(unsigned long handle)
{
/* nothing to do here */
}
static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data)
{
struct kvmgt_guest_info *info;
struct intel_vgpu *vgpu;
if (!handle_valid(handle))
return -ESRCH;
info = (struct kvmgt_guest_info *)handle;
vgpu = info->vgpu;
if (eventfd_signal(vgpu->vdev.msi_trigger, 1) == 1)
return 0;
return -EFAULT;
}
static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
{
unsigned long iova, pfn;
struct kvmgt_guest_info *info;
struct device *dev;
struct intel_vgpu *vgpu;
int rc;
if (!handle_valid(handle))
return INTEL_GVT_INVALID_ADDR;
info = (struct kvmgt_guest_info *)handle;
vgpu = info->vgpu;
iova = gvt_cache_find(info->vgpu, gfn);
if (iova != INTEL_GVT_INVALID_ADDR)
return iova;
pfn = INTEL_GVT_INVALID_ADDR;
dev = mdev_dev(info->vgpu->vdev.mdev);
rc = vfio_pin_pages(dev, &gfn, 1, IOMMU_READ | IOMMU_WRITE, &pfn);
if (rc != 1) {
gvt_vgpu_err("vfio_pin_pages failed for gfn 0x%lx: %d\n",
gfn, rc);
return INTEL_GVT_INVALID_ADDR;
}
/* transfer to host iova for GFX to use DMA */
rc = gvt_dma_map_iova(info->vgpu, pfn, &iova);
if (rc) {
gvt_vgpu_err("gvt_dma_map_iova failed for gfn: 0x%lx\n", gfn);
vfio_unpin_pages(dev, &gfn, 1);
return INTEL_GVT_INVALID_ADDR;
}
gvt_cache_add(info->vgpu, gfn, iova);
return iova;
}
static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,
void *buf, unsigned long len, bool write)
{
struct kvmgt_guest_info *info;
struct kvm *kvm;
int idx, ret;
bool kthread = current->mm == NULL;
if (!handle_valid(handle))
return -ESRCH;
info = (struct kvmgt_guest_info *)handle;
kvm = info->kvm;
if (kthread)
use_mm(kvm->mm);
idx = srcu_read_lock(&kvm->srcu);
ret = write ? kvm_write_guest(kvm, gpa, buf, len) :
kvm_read_guest(kvm, gpa, buf, len);
srcu_read_unlock(&kvm->srcu, idx);
if (kthread)
unuse_mm(kvm->mm);
return ret;
}
static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa,
void *buf, unsigned long len)
{
return kvmgt_rw_gpa(handle, gpa, buf, len, false);
}
static int kvmgt_write_gpa(unsigned long handle, unsigned long gpa,
void *buf, unsigned long len)
{
return kvmgt_rw_gpa(handle, gpa, buf, len, true);
}
static unsigned long kvmgt_virt_to_pfn(void *addr)
{
return PFN_DOWN(__pa(addr));
}
struct intel_gvt_mpt kvmgt_mpt = {
.host_init = kvmgt_host_init,
.host_exit = kvmgt_host_exit,
.attach_vgpu = kvmgt_attach_vgpu,
.detach_vgpu = kvmgt_detach_vgpu,
.inject_msi = kvmgt_inject_msi,
.from_virt_to_mfn = kvmgt_virt_to_pfn,
.set_wp_page = kvmgt_write_protect_add,
.unset_wp_page = kvmgt_write_protect_remove,
.read_gpa = kvmgt_read_gpa,
.write_gpa = kvmgt_write_gpa,
.gfn_to_mfn = kvmgt_gfn_to_pfn,
};
EXPORT_SYMBOL_GPL(kvmgt_mpt);
static int __init kvmgt_init(void)
{
return 0;
}
static void __exit kvmgt_exit(void)
{
}
module_init(kvmgt_init);
module_exit(kvmgt_exit);
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Intel Corporation");