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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
#include <linux/vfio.h>
#include <linux/vfio_pci_core.h>
#include "lm.h"
#include "dirty.h"
#include "vfio_dev.h"
struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio)
{
return pds_vfio->vfio_coredev.pdev;
}
struct device *pds_vfio_to_dev(struct pds_vfio_pci_device *pds_vfio)
{
return &pds_vfio_to_pci_dev(pds_vfio)->dev;
}
struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)
{
struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev);
return container_of(core_device, struct pds_vfio_pci_device,
vfio_coredev);
}
void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio)
{
again:
mutex_lock(&pds_vfio->reset_mutex);
if (pds_vfio->deferred_reset) {
pds_vfio->deferred_reset = false;
if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) {
pds_vfio_put_restore_file(pds_vfio);
pds_vfio_put_save_file(pds_vfio);
pds_vfio_dirty_disable(pds_vfio, false);
}
pds_vfio->state = pds_vfio->deferred_reset_state;
pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING;
mutex_unlock(&pds_vfio->reset_mutex);
goto again;
}
mutex_unlock(&pds_vfio->state_mutex);
mutex_unlock(&pds_vfio->reset_mutex);
}
void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio)
{
mutex_lock(&pds_vfio->reset_mutex);
pds_vfio->deferred_reset = true;
pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING;
if (!mutex_trylock(&pds_vfio->state_mutex)) {
mutex_unlock(&pds_vfio->reset_mutex);
return;
}
mutex_unlock(&pds_vfio->reset_mutex);
pds_vfio_state_mutex_unlock(pds_vfio);
}
static struct file *
pds_vfio_set_device_state(struct vfio_device *vdev,
enum vfio_device_mig_state new_state)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
struct file *res = NULL;
mutex_lock(&pds_vfio->state_mutex);
/*
* only way to transition out of VFIO_DEVICE_STATE_ERROR is via
* VFIO_DEVICE_RESET, so prevent the state machine from running since
* vfio_mig_get_next_state() will throw a WARN_ON() when transitioning
* from VFIO_DEVICE_STATE_ERROR to any other state
*/
while (pds_vfio->state != VFIO_DEVICE_STATE_ERROR &&
new_state != pds_vfio->state) {
enum vfio_device_mig_state next_state;
int err = vfio_mig_get_next_state(vdev, pds_vfio->state,
new_state, &next_state);
if (err) {
res = ERR_PTR(err);
break;
}
res = pds_vfio_step_device_state_locked(pds_vfio, next_state);
if (IS_ERR(res))
break;
pds_vfio->state = next_state;
if (WARN_ON(res && new_state != pds_vfio->state)) {
res = ERR_PTR(-EINVAL);
break;
}
}
pds_vfio_state_mutex_unlock(pds_vfio);
/* still waiting on a deferred_reset */
if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR)
res = ERR_PTR(-EIO);
return res;
}
static int pds_vfio_get_device_state(struct vfio_device *vdev,
enum vfio_device_mig_state *current_state)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
mutex_lock(&pds_vfio->state_mutex);
*current_state = pds_vfio->state;
pds_vfio_state_mutex_unlock(pds_vfio);
return 0;
}
static int pds_vfio_get_device_state_size(struct vfio_device *vdev,
unsigned long *stop_copy_length)
{
*stop_copy_length = PDS_LM_DEVICE_STATE_LENGTH;
return 0;
}
static const struct vfio_migration_ops pds_vfio_lm_ops = {
.migration_set_state = pds_vfio_set_device_state,
.migration_get_state = pds_vfio_get_device_state,
.migration_get_data_size = pds_vfio_get_device_state_size
};
static const struct vfio_log_ops pds_vfio_log_ops = {
.log_start = pds_vfio_dma_logging_start,
.log_stop = pds_vfio_dma_logging_stop,
.log_read_and_clear = pds_vfio_dma_logging_report,
};
static int pds_vfio_init_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
struct pci_dev *pdev = to_pci_dev(vdev->dev);
int err, vf_id, pci_id;
vf_id = pci_iov_vf_id(pdev);
if (vf_id < 0)
return vf_id;
err = vfio_pci_core_init_dev(vdev);
if (err)
return err;
pds_vfio->vf_id = vf_id;
mutex_init(&pds_vfio->state_mutex);
mutex_init(&pds_vfio->reset_mutex);
vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P;
vdev->mig_ops = &pds_vfio_lm_ops;
vdev->log_ops = &pds_vfio_log_ops;
pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn);
dev_dbg(&pdev->dev,
"%s: PF %#04x VF %#04x vf_id %d domain %d pds_vfio %p\n",
__func__, pci_dev_id(pci_physfn(pdev)), pci_id, vf_id,
pci_domain_nr(pdev->bus), pds_vfio);
return 0;
}
static void pds_vfio_release_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
mutex_destroy(&pds_vfio->state_mutex);
mutex_destroy(&pds_vfio->reset_mutex);
vfio_pci_core_release_dev(vdev);
}
static int pds_vfio_open_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
int err;
err = vfio_pci_core_enable(&pds_vfio->vfio_coredev);
if (err)
return err;
pds_vfio->state = VFIO_DEVICE_STATE_RUNNING;
pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING;
vfio_pci_core_finish_enable(&pds_vfio->vfio_coredev);
return 0;
}
static void pds_vfio_close_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
mutex_lock(&pds_vfio->state_mutex);
pds_vfio_put_restore_file(pds_vfio);
pds_vfio_put_save_file(pds_vfio);
pds_vfio_dirty_disable(pds_vfio, true);
mutex_unlock(&pds_vfio->state_mutex);
vfio_pci_core_close_device(vdev);
}
static const struct vfio_device_ops pds_vfio_ops = {
.name = "pds-vfio",
.init = pds_vfio_init_device,
.release = pds_vfio_release_device,
.open_device = pds_vfio_open_device,
.close_device = pds_vfio_close_device,
.ioctl = vfio_pci_core_ioctl,
.device_feature = vfio_pci_core_ioctl_feature,
.read = vfio_pci_core_read,
.write = vfio_pci_core_write,
.mmap = vfio_pci_core_mmap,
.request = vfio_pci_core_request,
.match = vfio_pci_core_match,
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
};
const struct vfio_device_ops *pds_vfio_ops_info(void)
{
return &pds_vfio_ops;
}
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