linux-kernel - Re: [drm:qxl] BUG: sleeping function called from invalid context

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Date:   Thu, 11 May 2017 19:24:03 +0200
From:   Mike Galbraith <efault@....de>
To:     Gabriel Krisman Bertazi <krisman@...labora.co.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dave Airlie <airlied@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [drm:qxl] BUG: sleeping function called from invalid context -
 qxl_bo_kmap_atomic_page()...splat

On Tue, 2017-05-09 at 04:37 +0200, Mike Galbraith wrote:
> On Mon, 2017-05-08 at 16:48 -0300, Gabriel Krisman Bertazi wrote:
> 
> > Thanks for reporting this.  Can you confirm the following patch prevents
> > the issue?
> 
> Nope, it still gripes.

The reason for this gripe is that we find that we don't have memory
reserved.. a tad too late.

            Xorg-2252  [000] ....   135.409756: qxl_release_map <-qxl_cursor_atomic_update
            Xorg-2252  [000] ....   135.409756: qxl_bo_kmap_atomic_page <-qxl_release_map
            Xorg-2252  [000] ....   135.409757: qxl_bo_kmap_atomic_page: ENTER
            Xorg-2252  [000] ....   135.409757: ttm_mem_io_lock <-qxl_bo_kmap_atomic_page
            Xorg-2252  [000] ....   135.409757: ttm_mem_io_reserve <-qxl_bo_kmap_atomic_page
            Xorg-2252  [000] ....   135.409757: qxl_ttm_io_mem_reserve <-ttm_mem_io_reserve
            Xorg-2252  [000] ....   135.409757: ttm_mem_io_unlock <-qxl_bo_kmap_atomic_page
            Xorg-2252  [000] ....   135.409757: qxl_bo_kmap_atomic_page: PREEMPTION DISABLED
            Xorg-2252  [000] ...1   135.409758: qxl_bo_kmap <-qxl_cursor_atomic_update
            Xorg-2252  [000] ...1   135.409758: ttm_bo_kmap <-qxl_bo_kmap  <== too late
            Xorg-2252  [000] ...1   135.409758: ttm_mem_io_reserve <-ttm_bo_kmap
            Xorg-2252  [000] ...1   135.409758: qxl_ttm_io_mem_reserve <-ttm_mem_io_reserve
            Xorg-2252  [000] ...1   135.409759: ioremap_nocache <-ttm_bo_kmap <== game over
            Xorg-2252  [000] ...1   135.409759: __ioremap_caller <-ioremap_nocache
            Xorg-2252  [000] ...1   135.409759: walk_system_ram_range <-__ioremap_caller
            Xorg-2252  [000] ...1   135.409759: find_next_iomem_res <-walk_system_ram_range
            Xorg-2252  [000] ...1   135.409759: _raw_read_lock <-find_next_iomem_res
            Xorg-2252  [000] ...1   135.409760: reserve_memtype <-__ioremap_caller
            Xorg-2252  [000] ...1   135.409760: pat_pagerange_is_ram <-reserve_memtype
            Xorg-2252  [000] ...1   135.409761: walk_system_ram_range <-pat_pagerange_is_ram
            Xorg-2252  [000] ...1   135.409761: find_next_iomem_res <-walk_system_ram_range
            Xorg-2252  [000] ...1   135.409761: _raw_read_lock <-find_next_iomem_res
            Xorg-2252  [000] ...1   135.409761: kmem_cache_alloc_trace <-reserve_memtype
            Xorg-2252  [000] ...1   135.409761: __might_sleep <-kmem_cache_alloc_trace
            Xorg-2252  [000] ...1   135.409762: ___might_sleep <-__might_sleep