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Message-ID: <ZAlxge8ENvruScGf@debian-scheme>
Date: Thu, 9 Mar 2023 13:41:21 +0800
From: Zhenyu Wang <zhenyuw@...ux.intel.com>
To: Cai Huoqing <cai.huoqing@...ux.dev>
Cc: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
dri-devel@...ts.freedesktop.org,
intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
linux-kernel@...r.kernel.org,
Jani Nikula <jani.nikula@...ux.intel.com>,
Zhenyu Wang <zhenyuw@...ux.intel.com>,
Daniel Vetter <daniel@...ll.ch>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
David Airlie <airlied@...il.com>,
Zhi Wang <zhi.a.wang@...el.com>
Subject: Re: [PATCH v2] drm/i915/gvt: Make use of idr_find and
idr_for_each_entry in dmabuf
On 2023.03.03 22:07:18 +0800, Cai Huoqing wrote:
> This patch uses the already existing IDR mechanism to simplify
> and improve the dmabuf code.
>
> Using 'vgpu.object_idr' directly instead of 'dmabuf_obj_list_head'
> or 'dmabuf.list', because the dmabuf_obj can be found by 'idr_find'
> or 'idr_for_each_entry'.
>
> Signed-off-by: Cai Huoqing <cai.huoqing@...ux.dev>
> ---
> v1->v2:
> 1.Use idr_find to get the target one and free it instead of free all dma objs.
> 2.Revert the original code 'ret' related
> 3.Add '&& !idr_is_empty()' like the original code '&& !list_empty()'
Looks good to me. I'll send it for some regression test before upstream.
Reviewed-by: Zhenyu Wang <zhenyuw@...ux.intel.com>
Thanks!
>
> v1 link:
> https://lore.kernel.org/lkml/20230302115318.79487-1-cai.huoqing@linux.dev/
>
> drivers/gpu/drm/i915/gvt/dmabuf.c | 58 +++++++------------------------
> drivers/gpu/drm/i915/gvt/dmabuf.h | 1 -
> drivers/gpu/drm/i915/gvt/gvt.h | 1 -
> drivers/gpu/drm/i915/gvt/vgpu.c | 1 -
> 4 files changed, 12 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.c b/drivers/gpu/drm/i915/gvt/dmabuf.c
> index 6834f9fe40cf..cf619b1ed3ad 100644
> --- a/drivers/gpu/drm/i915/gvt/dmabuf.c
> +++ b/drivers/gpu/drm/i915/gvt/dmabuf.c
> @@ -133,21 +133,15 @@ static void dmabuf_gem_object_free(struct kref *kref)
> struct intel_vgpu_dmabuf_obj *obj =
> container_of(kref, struct intel_vgpu_dmabuf_obj, kref);
> struct intel_vgpu *vgpu = obj->vgpu;
> - struct list_head *pos;
> struct intel_vgpu_dmabuf_obj *dmabuf_obj;
>
> if (vgpu && test_bit(INTEL_VGPU_STATUS_ACTIVE, vgpu->status) &&
> - !list_empty(&vgpu->dmabuf_obj_list_head)) {
> - list_for_each(pos, &vgpu->dmabuf_obj_list_head) {
> - dmabuf_obj = list_entry(pos, struct intel_vgpu_dmabuf_obj, list);
> - if (dmabuf_obj == obj) {
> - list_del(pos);
> - idr_remove(&vgpu->object_idr,
> - dmabuf_obj->dmabuf_id);
> - kfree(dmabuf_obj->info);
> - kfree(dmabuf_obj);
> - break;
> - }
> + !idr_is_empty(&vgpu->object_idr)) {
> + dmabuf_obj = idr_find(&vgpu->object_idr, obj->dmabuf_id);
> + if (dmabuf_obj) {
> + idr_remove(&vgpu->object_idr, obj->dmabuf_id);
> + kfree(dmabuf_obj->info);
> + kfree(dmabuf_obj);
> }
> } else {
> /* Free the orphan dmabuf_objs here */
> @@ -340,13 +334,12 @@ static struct intel_vgpu_dmabuf_obj *
> pick_dmabuf_by_info(struct intel_vgpu *vgpu,
> struct intel_vgpu_fb_info *latest_info)
> {
> - struct list_head *pos;
> struct intel_vgpu_fb_info *fb_info;
> struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL;
> struct intel_vgpu_dmabuf_obj *ret = NULL;
> + int id;
>
> - list_for_each(pos, &vgpu->dmabuf_obj_list_head) {
> - dmabuf_obj = list_entry(pos, struct intel_vgpu_dmabuf_obj, list);
> + idr_for_each_entry(&vgpu->object_idr, dmabuf_obj, id) {
> if (!dmabuf_obj->info)
> continue;
>
> @@ -366,24 +359,6 @@ pick_dmabuf_by_info(struct intel_vgpu *vgpu,
> return ret;
> }
>
> -static struct intel_vgpu_dmabuf_obj *
> -pick_dmabuf_by_num(struct intel_vgpu *vgpu, u32 id)
> -{
> - struct list_head *pos;
> - struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL;
> - struct intel_vgpu_dmabuf_obj *ret = NULL;
> -
> - list_for_each(pos, &vgpu->dmabuf_obj_list_head) {
> - dmabuf_obj = list_entry(pos, struct intel_vgpu_dmabuf_obj, list);
> - if (dmabuf_obj->dmabuf_id == id) {
> - ret = dmabuf_obj;
> - break;
> - }
> - }
> -
> - return ret;
> -}
> -
> static void update_fb_info(struct vfio_device_gfx_plane_info *gvt_dmabuf,
> struct intel_vgpu_fb_info *fb_info)
> {
> @@ -477,11 +452,6 @@ int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args)
>
> update_fb_info(gfx_plane_info, &fb_info);
>
> - INIT_LIST_HEAD(&dmabuf_obj->list);
> - mutex_lock(&vgpu->dmabuf_lock);
> - list_add_tail(&dmabuf_obj->list, &vgpu->dmabuf_obj_list_head);
> - mutex_unlock(&vgpu->dmabuf_lock);
> -
> gvt_dbg_dpy("vgpu%d: %s new dmabuf_obj ref %d, id %d\n", vgpu->id,
> __func__, kref_read(&dmabuf_obj->kref), ret);
>
> @@ -508,7 +478,7 @@ int intel_vgpu_get_dmabuf(struct intel_vgpu *vgpu, unsigned int dmabuf_id)
>
> mutex_lock(&vgpu->dmabuf_lock);
>
> - dmabuf_obj = pick_dmabuf_by_num(vgpu, dmabuf_id);
> + dmabuf_obj = idr_find(&vgpu->object_idr, dmabuf_id);
> if (dmabuf_obj == NULL) {
> gvt_vgpu_err("invalid dmabuf id:%d\n", dmabuf_id);
> ret = -EINVAL;
> @@ -570,23 +540,19 @@ int intel_vgpu_get_dmabuf(struct intel_vgpu *vgpu, unsigned int dmabuf_id)
>
> void intel_vgpu_dmabuf_cleanup(struct intel_vgpu *vgpu)
> {
> - struct list_head *pos, *n;
> struct intel_vgpu_dmabuf_obj *dmabuf_obj;
> + int id;
>
> mutex_lock(&vgpu->dmabuf_lock);
> - list_for_each_safe(pos, n, &vgpu->dmabuf_obj_list_head) {
> - dmabuf_obj = list_entry(pos, struct intel_vgpu_dmabuf_obj, list);
> + idr_for_each_entry(&vgpu->object_idr, dmabuf_obj, id) {
> dmabuf_obj->vgpu = NULL;
>
> - idr_remove(&vgpu->object_idr, dmabuf_obj->dmabuf_id);
> - list_del(pos);
> -
> + idr_remove(&vgpu->object_idr, id);
> /* dmabuf_obj might be freed in dmabuf_obj_put */
> if (dmabuf_obj->initref) {
> dmabuf_obj->initref = false;
> dmabuf_obj_put(dmabuf_obj);
> }
> -
> }
> mutex_unlock(&vgpu->dmabuf_lock);
> }
> diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.h b/drivers/gpu/drm/i915/gvt/dmabuf.h
> index 3dcdb6570eda..93c0e00bdab9 100644
> --- a/drivers/gpu/drm/i915/gvt/dmabuf.h
> +++ b/drivers/gpu/drm/i915/gvt/dmabuf.h
> @@ -57,7 +57,6 @@ struct intel_vgpu_dmabuf_obj {
> __u32 dmabuf_id;
> struct kref kref;
> bool initref;
> - struct list_head list;
> };
>
> int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args);
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
> index 2d65800d8e93..1100c789f207 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.h
> +++ b/drivers/gpu/drm/i915/gvt/gvt.h
> @@ -211,7 +211,6 @@ struct intel_vgpu {
>
> struct dentry *debugfs;
>
> - struct list_head dmabuf_obj_list_head;
> struct mutex dmabuf_lock;
> struct idr object_idr;
> struct intel_vgpu_vblank_timer vblank_timer;
> diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
> index 08ad1bd651f1..0a511cfef067 100644
> --- a/drivers/gpu/drm/i915/gvt/vgpu.c
> +++ b/drivers/gpu/drm/i915/gvt/vgpu.c
> @@ -329,7 +329,6 @@ int intel_gvt_create_vgpu(struct intel_vgpu *vgpu,
> vgpu->sched_ctl.weight = conf->weight;
> mutex_init(&vgpu->vgpu_lock);
> mutex_init(&vgpu->dmabuf_lock);
> - INIT_LIST_HEAD(&vgpu->dmabuf_obj_list_head);
> INIT_RADIX_TREE(&vgpu->page_track_tree, GFP_KERNEL);
> idr_init_base(&vgpu->object_idr, 1);
> intel_vgpu_init_cfg_space(vgpu, 1);
> --
> 2.34.1
>
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