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Message-ID: <3f235e08-bb58-be41-8e92-ccd2dfd68b33@huawei.com>
Date: Tue, 1 Dec 2020 20:26:29 +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 20:17, 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.
> 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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