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Subject: Re: [PATCH drm/hisilicon v2 1/4] drm/hisilicon: Assgin local variable
 to drm_device
To:     Thomas Zimmermann <tzimmermann@suse.de>,
        Tian Tao <tiantao6@hisilicon.com>, <airlied@linux.ie>,
        <daniel@ffwll.ch>, <kraxel@redhat.com>,
        <alexander.deucher@amd.com>, <tglx@linutronix.de>,
        <dri-devel@lists.freedesktop.org>, <xinliang.liu@linaro.org>,
        <maarten.lankhorst@linux.intel.com>, <mripard@kernel.org>
CC:     <linux-kernel@vger.kernel.org>
References: <1606823754-52451-1-git-send-email-tiantao6@hisilicon.com>
 <1606823754-52451-2-git-send-email-tiantao6@hisilicon.com>
 <fc644426-67db-7128-5f73-8630373ab0e8@suse.de>
From:   "tiantao (H)" <tiantao6@huawei.com>
Message-ID: <3f235e08-bb58-be41-8e92-ccd2dfd68b33@huawei.com>
Date:   Tue, 1 Dec 2020 20:26:29 +0800
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在 2020/12/1 20:17, Thomas Zimmermann 写道:
> Hi
> 
> Am 01.12.20 um 12:55 schrieb Tian Tao:
>> Assign local variable to struct drm_device *dev because they are
>> used multiple times within a function.
>>
>> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
>> ---
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c   |  2 +-
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c  | 30 
>> ++++++++++++------------
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h  |  2 +-
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c |  2 +-
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c      |  8 ++++---
>>   5 files changed, 23 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c 
>> b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
>> index ea962ac..096eea9 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
>> @@ -499,7 +499,7 @@ static const struct drm_crtc_helper_funcs 
>> hibmc_crtc_helper_funcs = {
>>   int hibmc_de_init(struct hibmc_drm_private *priv)
>>   {
>> -    struct drm_device *dev = priv->dev;
>> +    struct drm_device *dev = &priv->dev;
>>       struct drm_crtc *crtc = &priv->crtc;
>>       struct drm_plane *plane = &priv->primary_plane;
>>       int ret;
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c 
>> b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
>> index d845657..dd9fadc 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
>> @@ -79,31 +79,32 @@ static const struct dev_pm_ops hibmc_pm_ops = {
>>   static int hibmc_kms_init(struct hibmc_drm_private *priv)
>>   {
>> +    struct drm_device *dev = &priv->dev;
>>       int ret;
>> -    drm_mode_config_init(priv->dev);
>> +    drm_mode_config_init(dev);
>>       priv->mode_config_initialized = true;
>> -    priv->dev->mode_config.min_width = 0;
>> -    priv->dev->mode_config.min_height = 0;
>> -    priv->dev->mode_config.max_width = 1920;
>> -    priv->dev->mode_config.max_height = 1200;
>> +    dev->mode_config.min_width = 0;
>> +    dev->mode_config.min_height = 0;
>> +    dev->mode_config.max_width = 1920;
>> +    dev->mode_config.max_height = 1200;
>> -    priv->dev->mode_config.fb_base = priv->fb_base;
>> -    priv->dev->mode_config.preferred_depth = 32;
>> -    priv->dev->mode_config.prefer_shadow = 1;
>> +    dev->mode_config.fb_base = priv->fb_base;
>> +    dev->mode_config.preferred_depth = 32;
>> +    dev->mode_config.prefer_shadow = 1;
>> -    priv->dev->mode_config.funcs = (void *)&hibmc_mode_funcs;
>> +    dev->mode_config.funcs = (void *)&hibmc_mode_funcs;
>>       ret = hibmc_de_init(priv);
>>       if (ret) {
>> -        drm_err(priv->dev, "failed to init de: %d\n", ret);
>> +        drm_err(dev, "failed to init de: %d\n", ret);
>>           return ret;
>>       }
>>       ret = hibmc_vdac_init(priv);
>>       if (ret) {
>> -        drm_err(priv->dev, "failed to init vdac: %d\n", ret);
>> +        drm_err(dev, "failed to init vdac: %d\n", ret);
>>           return ret;
>>       }
>> @@ -113,7 +114,7 @@ static int hibmc_kms_init(struct hibmc_drm_private 
>> *priv)
>>   static void hibmc_kms_fini(struct hibmc_drm_private *priv)
>>   {
>>       if (priv->mode_config_initialized) {
>> -        drm_mode_config_cleanup(priv->dev);
>> +        drm_mode_config_cleanup(&priv->dev);
>>           priv->mode_config_initialized = false;
>>       }
>>   }
>> @@ -202,7 +203,7 @@ static void hibmc_hw_config(struct 
>> hibmc_drm_private *priv)
>>   static int hibmc_hw_map(struct hibmc_drm_private *priv)
>>   {
>> -    struct drm_device *dev = priv->dev;
>> +    struct drm_device *dev = &priv->dev;
>>       struct pci_dev *pdev = dev->pdev;
>>       resource_size_t addr, size, ioaddr, iosize;
>> @@ -258,7 +259,7 @@ static int hibmc_unload(struct drm_device *dev)
>>   static int hibmc_load(struct drm_device *dev)
>>   {
>> -    struct hibmc_drm_private *priv;
>> +    struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
>>       int ret;
>>       priv = drmm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>> @@ -267,7 +268,6 @@ static int hibmc_load(struct drm_device *dev)
>>           return -ENOMEM;
>>       }
>>       dev->dev_private = priv;
>> -    priv->dev = dev;
> 
> I'm sure this either does not build or does not work. There's a call to 
> drm_dev_alloc(), which initialized the DRM device. You need to assign 
> the returned device here. The embedding of dev only work after you 
> switched to devm_drm_dev_alloc() in the next patch.
> 
> For the patch at hand, just keep struct hibmc_drm_private.dev as a 
> pointer and you should be fine.
> 
Changing drm_device *dev to drm_device dev and using devm_drm_dev_alloc 
does not easily split into two patches.
The patch does not compile well on its own, but it will compile fine 
with patch #2.
Can patch #1 and patch #2 be combined into a single patch,just like V1.
> Best regards
> Thomas
> 
>>       ret = hibmc_hw_init(priv);
>>       if (ret)
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h 
>> b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
>> index f310a83..e35353a 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
>> @@ -37,7 +37,7 @@ struct hibmc_drm_private {
>>       resource_size_t  fb_size;
>>       /* drm */
>> -    struct drm_device  *dev;
>> +    struct drm_device dev;
>>       struct drm_plane primary_plane;
>>       struct drm_crtc crtc;
>>       struct drm_encoder encoder;
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c 
>> b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
>> index 74e26c2..d35548d 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
>> @@ -96,7 +96,7 @@ static const struct drm_encoder_funcs 
>> hibmc_encoder_funcs = {
>>   int hibmc_vdac_init(struct hibmc_drm_private *priv)
>>   {
>> -    struct drm_device *dev = priv->dev;
>> +    struct drm_device *dev = &priv->dev;
>>       struct hibmc_connector *hibmc_connector = &priv->connector;
>>       struct drm_encoder *encoder = &priv->encoder;
>>       struct drm_connector *connector = &hibmc_connector->base;
>> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c 
>> b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
>> index 602ece1..e84fb81 100644
>> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
>> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
>> @@ -25,7 +25,7 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc)
>>   {
>>       struct drm_vram_mm *vmm;
>>       int ret;
>> -    struct drm_device *dev = hibmc->dev;
>> +    struct drm_device *dev = &hibmc->dev;
>>       vmm = drm_vram_helper_alloc_mm(dev,
>>                          pci_resource_start(dev->pdev, 0),
>> @@ -41,10 +41,12 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc)
>>   void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
>>   {
>> -    if (!hibmc->dev->vram_mm)
>> +    struct drm_device *dev = &hibmc->dev;
>> +
>> +    if (!dev->vram_mm)
>>           return;
>> -    drm_vram_helper_release_mm(hibmc->dev);
>> +    drm_vram_helper_release_mm(dev);
>>   }
>>   int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
>>
>