linux-kernel - Re: [PATCH drm-next v4 14/14] drm/nouveau: debugfs: implement DRM GPU VA debugfs

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Message-ID: <20230614012057.jhyzdliloui5k7yx@revolver>
Date:   Tue, 13 Jun 2023 21:20:57 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Danilo Krummrich <dakr@...hat.com>
Cc:     airlied@...il.com, daniel@...ll.ch, tzimmermann@...e.de,
        mripard@...nel.org, corbet@....net, christian.koenig@....com,
        bskeggs@...hat.com, matthew.brost@...el.com,
        boris.brezillon@...labora.com, alexdeucher@...il.com,
        ogabbay@...nel.org, bagasdotme@...il.com, willy@...radead.org,
        jason@...kstrand.net, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH drm-next v4 14/14] drm/nouveau: debugfs: implement DRM
 GPU VA debugfs

* Danilo Krummrich <dakr@...hat.com> [230606 18:32]:
> Provide the driver indirection iterating over all DRM GPU VA spaces to
> enable the common 'gpuvas' debugfs file for dumping DRM GPU VA spaces.
> 
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
> ---
>  drivers/gpu/drm/nouveau/nouveau_debugfs.c | 39 +++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> index 99d022a91afc..053f703f2f68 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> @@ -203,6 +203,44 @@ nouveau_debugfs_pstate_open(struct inode *inode, struct file *file)
>  	return single_open(file, nouveau_debugfs_pstate_get, inode->i_private);
>  }
>  
> +static void
> +nouveau_debugfs_gpuva_regions(struct seq_file *m, struct nouveau_uvmm *uvmm)
> +{
> +	MA_STATE(mas, &uvmm->region_mt, 0, 0);
> +	struct nouveau_uvma_region *reg;
> +
> +	seq_puts  (m, " VA regions  | start              | range              | end                \n");
> +	seq_puts  (m, "----------------------------------------------------------------------------\n");

rcu_read_lock();

> +	mas_for_each(&mas, reg, ULONG_MAX)
> +		seq_printf(m, "             | 0x%016llx | 0x%016llx | 0x%016llx\n",
> +			   reg->va.addr, reg->va.range, reg->va.addr + reg->va.range);

rcu_read_unlock();

> +}
> +
> +static int
> +nouveau_debugfs_gpuva(struct seq_file *m, void *data)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *) m->private;
> +	struct nouveau_drm *drm = nouveau_drm(node->minor->dev);
> +	struct nouveau_cli *cli;
> +
> +	mutex_lock(&drm->clients_lock);
> +	list_for_each_entry(cli, &drm->clients, head) {
> +		struct nouveau_uvmm *uvmm = nouveau_cli_uvmm(cli);
> +
> +		if (!uvmm)
> +			continue;
> +
> +		nouveau_uvmm_lock(uvmm);
> +		drm_debugfs_gpuva_info(m, &uvmm->umgr);
> +		seq_puts(m, "\n");
> +		nouveau_debugfs_gpuva_regions(m, uvmm);
> +		nouveau_uvmm_unlock(uvmm);
> +	}
> +	mutex_unlock(&drm->clients_lock);
> +
> +	return 0;
> +}
> +
>  static const struct file_operations nouveau_pstate_fops = {
>  	.owner = THIS_MODULE,
>  	.open = nouveau_debugfs_pstate_open,
> @@ -214,6 +252,7 @@ static const struct file_operations nouveau_pstate_fops = {
>  static struct drm_info_list nouveau_debugfs_list[] = {
>  	{ "vbios.rom",  nouveau_debugfs_vbios_image, 0, NULL },
>  	{ "strap_peek", nouveau_debugfs_strap_peek, 0, NULL },
> +	DRM_DEBUGFS_GPUVA_INFO(nouveau_debugfs_gpuva, NULL),
>  };
>  #define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)
>  
> -- 
> 2.40.1
>