[PATCH] drm/ttm: ioremap buffer according to TTM mem caching setting

[Christian König]

Hi guys,

adding the usual suspects direct. Does anybody of hand know how to check 
if an architecture supports ioremap_cache()?

For now we only need this on X86, but I would feel better if we don't 
use an #ifdef here.

Regards,
Christian.

Am 02.03.21 um 05:12 schrieb kernel test robot:
> Hi Oak,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on drm-intel/for-linux-next]
> [also build test ERROR on drm-tip/drm-tip linus/master v5.12-rc1 next-20210302]
> [cannot apply to tegra-drm/drm/tegra/for-next drm-exynos/exynos-drm-next drm/drm-next]
> [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]
>
> url:    https://github.com/0day-ci/linux/commits/Oak-Zeng/drm-ttm-ioremap-buffer-according-to-TTM-mem-caching-setting/20210302-064500
> base:   git://anongit.freedesktop.org/drm-intel for-linux-next
> config: parisc-randconfig-r012-20210302 (attached as .config)
> compiler: hppa-linux-gcc (GCC) 9.3.0
> 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/0day-ci/linux/commit/225bb3711439ec559dd72ae5af8e62d34ea60a64
>          git remote add linux-review https://github.com/0day-ci/linux
>          git fetch --no-tags linux-review Oak-Zeng/drm-ttm-ioremap-buffer-according-to-TTM-mem-caching-setting/20210302-064500
>          git checkout 225bb3711439ec559dd72ae5af8e62d34ea60a64
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp at intel.com>
>
> All errors (new ones prefixed by >>):
>
>     drivers/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_resource_ioremap':
>>> drivers/gpu/drm/ttm/ttm_bo_util.c:95:11: error: implicit declaration of function 'ioremap_cache'; did you mean 'ioremap_uc'? [-Werror=implicit-function-declaration]
>        95 |    addr = ioremap_cache(mem->bus.offset, bus_size);
>           |           ^~~~~~~~~~~~~
>           |           ioremap_uc
>     drivers/gpu/drm/ttm/ttm_bo_util.c:95:9: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>        95 |    addr = ioremap_cache(mem->bus.offset, bus_size);
>           |         ^
>     drivers/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_bo_ioremap':
>     drivers/gpu/drm/ttm/ttm_bo_util.c:379:17: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>       379 |    map->virtual = ioremap_cache(bo->mem.bus.offset + offset,
>           |                 ^
>     drivers/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_bo_vmap':
>     drivers/gpu/drm/ttm/ttm_bo_util.c:500:16: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>       500 |    vaddr_iomem = ioremap_cache(mem->bus.offset,
>           |                ^
>     cc1: some warnings being treated as errors
>
>
> vim +95 drivers/gpu/drm/ttm/ttm_bo_util.c
>
>      74	
>      75	static int ttm_resource_ioremap(struct ttm_bo_device *bdev,
>      76				       struct ttm_resource *mem,
>      77				       void **virtual)
>      78	{
>      79		int ret;
>      80		void *addr;
>      81	
>      82		*virtual = NULL;
>      83		ret = ttm_mem_io_reserve(bdev, mem);
>      84		if (ret || !mem->bus.is_iomem)
>      85			return ret;
>      86	
>      87		if (mem->bus.addr) {
>      88			addr = mem->bus.addr;
>      89		} else {
>      90			size_t bus_size = (size_t)mem->num_pages << PAGE_SHIFT;
>      91	
>      92			if (mem->bus.caching == ttm_write_combined)
>      93				addr = ioremap_wc(mem->bus.offset, bus_size);
>      94			else if (mem->bus.caching == ttm_cached)
>    > 95				addr = ioremap_cache(mem->bus.offset, bus_size);
>      96			else
>      97				addr = ioremap(mem->bus.offset, bus_size);
>      98			if (!addr) {
>      99				ttm_mem_io_free(bdev, mem);
>     100				return -ENOMEM;
>     101			}
>     102		}
>     103		*virtual = addr;
>     104		return 0;
>     105	}
>     106	
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>
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