[PATCH v7 2/2] drm: add kms driver for loongson display controller

[Sui jingfeng]

On 2023/3/16 17:53, kernel test robot wrote:
> Hi Sui,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on drm-misc/drm-misc-next]
> [also build test WARNING on linus/master v6.3-rc2 next-20230316]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Sui-Jingfeng/MAINTAINERS-add-maintainers-for-DRM-LOONGSON-driver/20230316-051724
> base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
> patch link:    https://lore.kernel.org/r/20230315211550.2620818-3-15330273260%40189.cn
> patch subject: [PATCH v7 2/2] drm: add kms driver for loongson display controller
> config: arm-allmodconfig (https://download.01.org/0day-ci/archive/20230316/202303161727.8HnBf6cW-lkp@intel.com/config)
> compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
> reproduce (this is a W=1 build):
>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>          chmod +x ~/bin/make.cross
>          # https://github.com/intel-lab-lkp/linux/commit/ba899dba3475b9612f212e3b1daedc3d9a299458
>          git remote add linux-review https://github.com/intel-lab-lkp/linux
>          git fetch --no-tags linux-review Sui-Jingfeng/MAINTAINERS-add-maintainers-for-DRM-LOONGSON-driver/20230316-051724
>          git checkout ba899dba3475b9612f212e3b1daedc3d9a299458
>          # save the config file
>          mkdir build_dir && cp config build_dir/.config
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/loongson/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp at intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202303161727.8HnBf6cW-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>     drivers/gpu/drm/loongson/lsdc_gem.c: In function 'lsdc_show_buffer_object':
>>> drivers/gpu/drm/loongson/lsdc_gem.c:280:51: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
>       280 |                 seq_printf(m, "bo[%04u]: size: %8lukB %s\n",
>           |                                                ~~~^
>           |                                                   |
>           |                                                   long unsigned int
>           |                                                %8u
>       281 |                            i,
>       282 |                            lsdc_bo_size(tbo) >> 10,
>           |                            ~~~~~~~~~~~~~~~~~~~~~~~
>           |                                              |
>           |                                              size_t {aka unsigned int}
>
>
> vim +280 drivers/gpu/drm/loongson/lsdc_gem.c
>
>     264	
>     265	int lsdc_show_buffer_object(struct seq_file *m, void *arg)
>     266	{
>     267	#ifdef CONFIG_DEBUG_FS
>     268		struct drm_info_node *node = (struct drm_info_node *)m->private;
>     269		struct drm_device *ddev = node->minor->dev;
>     270		struct lsdc_device *ldev = to_lsdc(ddev);
>     271		struct lsdc_bo *lbo;
>     272		unsigned int i = 0;
>     273	
>     274		mutex_lock(&ldev->gem.mutex);
>     275	
>     276		list_for_each_entry(lbo, &ldev->gem.objects, list) {
>     277			struct ttm_buffer_object *tbo = &lbo->tbo;
>     278			struct ttm_resource *resource = tbo->resource;
>     279	
>   > 280			seq_printf(m, "bo[%04u]: size: %8lukB %s\n",
>
Hi, this is buffer objects tracking implemented in v7

For example,

[root at fedora 0]# pwd

/sys/kernel/debug/dri/0

[root at fedora 0]# cat chip

I'm in LS7A2000, running on cpu 0xc0, cpu revison: 0x11

[root at fedora 0]# cat bos
bo[0000]: size:     8112kB VRAM
bo[0001]: size:    16208kB VRAM
bo[0002]: size:       16kB VRAM
bo[0003]: size:       16kB VRAM


When using with modesetting driver with shadowfb option enabled.

by default we have only 4 BOs create, the first one is for fbcon,  the 
largest one is  framebuffer of double screen.

another two is hardware cursor bo.  Our system page size is 16KB by default.