Re: [PATCH v2 08/15] drm/i915/gvt: Use the new device life cycle helpers

Zhenyu Wang
2022-09-07T03:43:23Z

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On 2022.09.01 22:37:40 +0800, Kevin Tian wrote:
> Move vfio_device to the start of intel_vgpu as required by the new
> helpers.
>
> Change intel_gvt_create_vgpu() to use intel_vgpu as the first param
> as other vgpu helpers do.
>
> Signed-off-by: Kevin Tian <kevin.tian@intel.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> ---

Looks good to me.

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

> drivers/gpu/drm/i915/gvt/gvt.h | 5 ++-
> drivers/gpu/drm/i915/gvt/kvmgt.c | 52 ++++++++++++++++++++++----------
> drivers/gpu/drm/i915/gvt/vgpu.c | 33 ++++++++------------
> 3 files changed, 50 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
> index 705689e64011..89fab7896fc6 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.h
> +++ b/drivers/gpu/drm/i915/gvt/gvt.h
> @@ -172,6 +172,7 @@ struct intel_vgpu_submission {
> #define KVMGT_DEBUGFS_FILENAME "kvmgt_nr_cache_entries"
>
> struct intel_vgpu {
> + struct vfio_device vfio_device;
> struct intel_gvt *gvt;
> struct mutex vgpu_lock;
> int id;
> @@ -211,7 +212,6 @@ struct intel_vgpu {
>
> u32 scan_nonprivbb;
>
> - struct vfio_device vfio_device;
> struct vfio_region *region;
> int num_regions;
> struct eventfd_ctx *intx_trigger;
> @@ -494,8 +494,7 @@ void intel_gvt_clean_vgpu_types(struct intel_gvt *gvt);
>
> struct intel_vgpu *intel_gvt_create_idle_vgpu(struct intel_gvt *gvt);
> void intel_gvt_destroy_idle_vgpu(struct intel_vgpu *vgpu);
> -struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
> - struct intel_vgpu_type *type);
> +int intel_gvt_create_vgpu(struct intel_vgpu *vgpu, struct intel_vgpu_type *type);
> void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu);
> void intel_gvt_release_vgpu(struct intel_vgpu *vgpu);
> void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index e3cd58946477..41bba40feef8 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -1546,7 +1546,33 @@ static const struct attribute_group *intel_vgpu_groups[] = {
> NULL,
> };
>
> +static int intel_vgpu_init_dev(struct vfio_device *vfio_dev)
> +{
> + struct mdev_device *mdev = to_mdev_device(vfio_dev->dev);
> + struct device *pdev = mdev_parent_dev(mdev);
> + struct intel_gvt *gvt = kdev_to_i915(pdev)->gvt;
> + struct intel_vgpu_type *type;
> + struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
> +
> + type = &gvt->types[mdev_get_type_group_id(mdev)];
> + if (!type)
> + return -EINVAL;
> +
> + vgpu->gvt = gvt;
> + return intel_gvt_create_vgpu(vgpu, type);
> +}
> +
> +static void intel_vgpu_release_dev(struct vfio_device *vfio_dev)
> +{
> + struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
> +
> + intel_gvt_destroy_vgpu(vgpu);
> + vfio_free_device(vfio_dev);
> +}
> +
> static const struct vfio_device_ops intel_vgpu_dev_ops = {
> + .init = intel_vgpu_init_dev,
> + .release = intel_vgpu_release_dev,
> .open_device = intel_vgpu_open_device,
> .close_device = intel_vgpu_close_device,
> .read = intel_vgpu_read,
> @@ -1558,35 +1584,28 @@ static const struct vfio_device_ops intel_vgpu_dev_ops = {
>
> static int intel_vgpu_probe(struct mdev_device *mdev)
> {
> - struct device *pdev = mdev_parent_dev(mdev);
> - struct intel_gvt *gvt = kdev_to_i915(pdev)->gvt;
> - struct intel_vgpu_type *type;
> struct intel_vgpu *vgpu;
> int ret;
>
> - type = &gvt->types[mdev_get_type_group_id(mdev)];
> - if (!type)
> - return -EINVAL;
> -
> - vgpu = intel_gvt_create_vgpu(gvt, type);
> + vgpu = vfio_alloc_device(intel_vgpu, vfio_device, &mdev->dev,
> + &intel_vgpu_dev_ops);
> if (IS_ERR(vgpu)) {
> gvt_err("failed to create intel vgpu: %ld\n", PTR_ERR(vgpu));
> return PTR_ERR(vgpu);
> }
>
> - vfio_init_group_dev(&vgpu->vfio_device, &mdev->dev,
> - &intel_vgpu_dev_ops);
> -
> dev_set_drvdata(&mdev->dev, vgpu);
> ret = vfio_register_emulated_iommu_dev(&vgpu->vfio_device);
> - if (ret) {
> - intel_gvt_destroy_vgpu(vgpu);
> - return ret;
> - }
> + if (ret)
> + goto out_put_vdev;
>
> gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
> dev_name(mdev_dev(mdev)));
> return 0;
> +
> +out_put_vdev:
> + vfio_put_device(&vgpu->vfio_device);
> + return ret;
> }
>
> static void intel_vgpu_remove(struct mdev_device *mdev)
> @@ -1595,7 +1614,8 @@ static void intel_vgpu_remove(struct mdev_device *mdev)
>
> if (WARN_ON_ONCE(vgpu->attached))
> return;
> - intel_gvt_destroy_vgpu(vgpu);
> +
> + vfio_put_device(&vgpu->vfio_device);
> }
>
> static struct mdev_driver intel_vgpu_mdev_driver = {
> diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
> index 46da19b3225d..5c533fbc2c8d 100644
> --- a/drivers/gpu/drm/i915/gvt/vgpu.c
> +++ b/drivers/gpu/drm/i915/gvt/vgpu.c
> @@ -302,8 +302,6 @@ void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu)
> mutex_lock(&gvt->lock);
> intel_gvt_update_vgpu_types(gvt);
> mutex_unlock(&gvt->lock);
> -
> - vfree(vgpu);
> }
>
> #define IDLE_VGPU_IDR 0
> @@ -363,28 +361,23 @@ void intel_gvt_destroy_idle_vgpu(struct intel_vgpu *vgpu)
> vfree(vgpu);
> }
>
> -static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
> - struct intel_vgpu_creation_params *param)
> +static int __intel_gvt_create_vgpu(struct intel_vgpu *vgpu,
> + struct intel_vgpu_creation_params *param)
> {
> + struct intel_gvt *gvt = vgpu->gvt;
> struct drm_i915_private *dev_priv = gvt->gt->i915;
> - struct intel_vgpu *vgpu;
> int ret;
>
> gvt_dbg_core("low %llu MB high %llu MB fence %llu\n",
> param->low_gm_sz, param->high_gm_sz,
> param->fence_sz);
>
> - vgpu = vzalloc(sizeof(*vgpu));
> - if (!vgpu)
> - return ERR_PTR(-ENOMEM);
> -
> ret = idr_alloc(&gvt->vgpu_idr, vgpu, IDLE_VGPU_IDR + 1, GVT_MAX_VGPU,
> GFP_KERNEL);
> if (ret < 0)
> - goto out_free_vgpu;
> + return ret;
>
> vgpu->id = ret;
> - vgpu->gvt = gvt;
> vgpu->sched_ctl.weight = param->weight;
> mutex_init(&vgpu->vgpu_lock);
> mutex_init(&vgpu->dmabuf_lock);
> @@ -437,7 +430,7 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
> if (ret)
> goto out_clean_sched_policy;
>
> - return vgpu;
> + return 0;
>
> out_clean_sched_policy:
> intel_vgpu_clean_sched_policy(vgpu);
> @@ -455,9 +448,7 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
> intel_vgpu_clean_mmio(vgpu);
> out_clean_idr:
> idr_remove(&gvt->vgpu_idr, vgpu->id);
> -out_free_vgpu:
> - vfree(vgpu);
> - return ERR_PTR(ret);
> + return ret;
> }
>
> /**
> @@ -470,11 +461,11 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
> * Returns:
> * pointer to intel_vgpu, error pointer if failed.
> */
> -struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
> - struct intel_vgpu_type *type)
> +int intel_gvt_create_vgpu(struct intel_vgpu *vgpu, struct intel_vgpu_type *type)
> {
> + struct intel_gvt *gvt = vgpu->gvt;
> struct intel_vgpu_creation_params param;
> - struct intel_vgpu *vgpu;
> + int ret;
>
> param.primary = 1;
> param.low_gm_sz = type->low_gm_size;
> @@ -488,15 +479,15 @@ struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
> param.high_gm_sz = BYTES_TO_MB(param.high_gm_sz);
>
> mutex_lock(&gvt->lock);
> - vgpu = __intel_gvt_create_vgpu(gvt, &param);
> - if (!IS_ERR(vgpu)) {
> + ret = __intel_gvt_create_vgpu(vgpu, &param);
> + if (!ret) {
> /* calculate left instance change for types */
> intel_gvt_update_vgpu_types(gvt);
> intel_gvt_update_reg_whitelist(vgpu);
> }
> mutex_unlock(&gvt->lock);
>
> - return vgpu;
> + return ret;
> }
>
> /**
> --
> 2.21.3
>

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