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vfio/mlx5: Use its own PCI reset_done error handler

Browse source 
Register its own handler for pci_error_handlers.reset_done and update
state accordingly.

Link: https://lore.kernel.org/all/20220224142024.147653-16-yishaih@nvidia.com
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
This commit is contained in:
Yishai Hadas 2022-02-24 16:20:24 +02:00 committed by Leon Romanovsky
parent 915076f70e
commit 88faa5e8ea
1 changed files with 55 additions and 2 deletions
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57
drivers/vfio/pci/mlx5/main.c
View file

@ -29,9 +29,12 @@ struct mlx5vf_pci_core_device {
struct vfio_pci_core_device core_device;
u16 vhca_id;
u8 migrate_cap:1;
u8 deferred_reset:1;
/* protect migration state */
struct mutex state_mutex;
enum vfio_device_mig_state mig_state;
/* protect the reset_done flow */
spinlock_t reset_lock;
struct mlx5_vf_migration_file *resuming_migf;
struct mlx5_vf_migration_file *saving_migf;
};
@ -437,6 +440,25 @@ mlx5vf_pci_step_device_state_locked(struct mlx5vf_pci_core_device *mvdev,
return ERR_PTR(-EINVAL);
}
/*
* This function is called in all state_mutex unlock cases to
* handle a 'deferred_reset' if exists.
*/
static void mlx5vf_state_mutex_unlock(struct mlx5vf_pci_core_device *mvdev)
{
again:
spin_lock(&mvdev->reset_lock);
if (mvdev->deferred_reset) {
mvdev->deferred_reset = false;
spin_unlock(&mvdev->reset_lock);
mvdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
mlx5vf_disable_fds(mvdev);
goto again;
}
mutex_unlock(&mvdev->state_mutex);
spin_unlock(&mvdev->reset_lock);
}
static struct file *
mlx5vf_pci_set_device_state(struct vfio_device *vdev,
enum vfio_device_mig_state new_state)
@ -465,7 +487,7 @@ mlx5vf_pci_set_device_state(struct vfio_device *vdev,
break;
}
}
mutex_unlock(&mvdev->state_mutex);
mlx5vf_state_mutex_unlock(mvdev);
return res;
}
@ -477,10 +499,34 @@ static int mlx5vf_pci_get_device_state(struct vfio_device *vdev,
mutex_lock(&mvdev->state_mutex);
*curr_state = mvdev->mig_state;
mutex_unlock(&mvdev->state_mutex);
mlx5vf_state_mutex_unlock(mvdev);
return 0;
}
static void mlx5vf_pci_aer_reset_done(struct pci_dev *pdev)
{
struct mlx5vf_pci_core_device *mvdev = dev_get_drvdata(&pdev->dev);
if (!mvdev->migrate_cap)
return;
/*
* As the higher VFIO layers are holding locks across reset and using
* those same locks with the mm_lock we need to prevent ABBA deadlock
* with the state_mutex and mm_lock.
* In case the state_mutex was taken already we defer the cleanup work
* to the unlock flow of the other running context.
*/
spin_lock(&mvdev->reset_lock);
mvdev->deferred_reset = true;
if (!mutex_trylock(&mvdev->state_mutex)) {
spin_unlock(&mvdev->reset_lock);
return;
}
spin_unlock(&mvdev->reset_lock);
mlx5vf_state_mutex_unlock(mvdev);
}
static int mlx5vf_pci_open_device(struct vfio_device *core_vdev)
{
struct mlx5vf_pci_core_device *mvdev = container_of(
@ -562,6 +608,7 @@ static int mlx5vf_pci_probe(struct pci_dev *pdev,
VFIO_MIGRATION_STOP_COPY |
VFIO_MIGRATION_P2P;
mutex_init(&mvdev->state_mutex);
spin_lock_init(&mvdev->reset_lock);
}
mlx5_vf_put_core_dev(mdev);
}
@ -596,11 +643,17 @@ static const struct pci_device_id mlx5vf_pci_table[] = {
MODULE_DEVICE_TABLE(pci, mlx5vf_pci_table);
static const struct pci_error_handlers mlx5vf_err_handlers = {
.reset_done = mlx5vf_pci_aer_reset_done,
.error_detected = vfio_pci_core_aer_err_detected,
};
static struct pci_driver mlx5vf_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = mlx5vf_pci_table,
.probe = mlx5vf_pci_probe,
.remove = mlx5vf_pci_remove,
.err_handler = &mlx5vf_err_handlers,
};
static void __exit mlx5vf_pci_cleanup(void)