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Message-ID: <51e7e774-6795-8eeb-6701-b1cccc4c6199@huawei.com>
Date: Tue, 1 Dec 2020 21:05:38 +0800
From: "tiantao (H)" <tiantao6@...wei.com>
To: Thomas Zimmermann <tzimmermann@...e.de>,
Tian Tao <tiantao6@...ilicon.com>, <airlied@...ux.ie>,
<daniel@...ll.ch>, <kraxel@...hat.com>,
<alexander.deucher@....com>, <tglx@...utronix.de>,
<dri-devel@...ts.freedesktop.org>, <xinliang.liu@...aro.org>,
<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>
CC: <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH drm/hisilicon v2 1/4] drm/hisilicon: Assgin local variable
to drm_device
在 2020/12/1 20:36, Thomas Zimmermann 写道:
> Hi
>
> Am 01.12.20 um 13:26 schrieb tiantao (H):
>>
>>
>> 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@...ilicon.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.
>
> Most of the code in this patch does
>
> struct drm_device *dev = &priv->dev;
>
> to get dev as a local variable. Why don't you do
>
> struct drm_device *dev = priv->dev;
>
> ?
>
> That's all that's really needed.
+ priv = devm_drm_dev_alloc(&pdev->dev, &hibmc_driver,
+ struct hibmc_drm_private, dev);
devm_drm_dev_alloc function requires parameter 4, dev must be a
non-pointer for it to work. so had to change dev in the
hibmc_drm_private to non-pointer.
This is also the reason to change drm_device *dev to drm_device dev.
>
> Best regards
> Thomas
>
>>> 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,
>>>>
>>>
>>
>
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