linux-kernel - Re: [PATCH 2/2] panthor: use drm_gpuva_unlink

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Message-ID: <20250905145257.33339817@fedora>
Date: Fri, 5 Sep 2025 14:52:57 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Danilo Krummrich <dakr@...nel.org>, Matthew Brost
 <matthew.brost@...el.com>, "Thomas Hellström"
 <thomas.hellstrom@...ux.intel.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Steven Price <steven.price@....com>,
 Daniel Almeida <daniel.almeida@...labora.com>, Liviu Dudau
 <liviu.dudau@....com>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 2/2] panthor: use drm_gpuva_unlink_defer()

On Fri, 05 Sep 2025 12:11:29 +0000
Alice Ryhl <aliceryhl@...gle.com> wrote:

>  static void panthor_vm_cleanup_op_ctx(struct panthor_vm_op_ctx *op_ctx,
>  				      struct panthor_vm *vm)
>  {
> -	struct panthor_vma *vma, *tmp_vma;
> -
>  	u32 remaining_pt_count = op_ctx->rsvd_page_tables.count -
>  				 op_ctx->rsvd_page_tables.ptr;
>  
> @@ -1134,16 +1091,12 @@ static void panthor_vm_cleanup_op_ctx(struct panthor_vm_op_ctx *op_ctx,
>  	kfree(op_ctx->rsvd_page_tables.pages);
>  
>  	if (op_ctx->map.vm_bo)
> -		panthor_vm_bo_put(op_ctx->map.vm_bo);
> +		drm_gpuvm_bo_put_deferred(op_ctx->map.vm_bo);
>  
>  	for (u32 i = 0; i < ARRAY_SIZE(op_ctx->preallocated_vmas); i++)
>  		kfree(op_ctx->preallocated_vmas[i]);
>  
> -	list_for_each_entry_safe(vma, tmp_vma, &op_ctx->returned_vmas, node) {
> -		list_del(&vma->node);
> -		panthor_vm_bo_put(vma->base.vm_bo);
> -		kfree(vma);

Maybe I'm missing something, but I don't see the VMAs being freed in
this new version.

> -	}
> +	drm_gpuvm_bo_deferred_cleanup(&vm->base);
>  }