Hi Am 04.09.19 um 08:49 schrieb Davidlohr Bueso: > Hi, > > While doing some changes to x86's pat code and thus having 'debugpat', I > noticed > some weird behavior in a server running linux-next as of -- yes, > reverting does 'fix' > the issue: > > 90f479ae51a (drm/mgag200: Replace struct mga_fbdev with generic > framebuffer emulation) > > Where the following splat is seen over and over endlessly for the same > range: > > x86/PAT: Overlap at 0xd0000000-0xd1000000 > x86/PAT: reserve_memtype added [mem 0xd0000000-0xd02fffff], track > write-combining, req write-combining, ret write-combining > x86/PAT: free_memtype request [mem 0xd0000000-0xd02fffff] > > And all these are doing ioremap from drm_fb_helper_dirty_work(): > > [ 114.330825] reserve_memtype+0x1b0/0x410 > [ 114.330829] ? ttm_bo_kmap+0x1d7/0x270 [ttm] > [ 114.330830] __ioremap_caller.constprop.14+0xf6/0x300 > [ 114.330832] ? soft_cursor+0x1f9/0x220 > [ 114.330835] ttm_bo_kmap+0x1d7/0x270 [ttm] > [ 114.330838] ? ttm_bo_del_sub_from_lru+0x29/0x40 [ttm] > [ 114.330841] drm_gem_vram_kmap+0x54/0x70 [drm_vram_helper] > [ 114.330842] drm_gem_vram_object_vmap+0x23/0x40 [drm_vram_helper] > [ 114.330853] drm_gem_vmap+0x1f/0x60 [drm] > [ 114.477697] drm_client_buffer_vmap+0x1d/0x30 [drm] > [ 114.477703] drm_fb_helper_dirty_work+0x92/0x180 [drm_kms_helper] > [ 114.477706] process_one_work+0x1f4/0x3e0 > [ 114.477707] worker_thread+0x2d/0x3e0 > > Before, the same range was also added, but only once, and fwiw it was > the same either > with 24 or 32 bpp. > > Any thoughts? Thanks for reporting. The original code kept around memory mappings for a longer time, while the new code remapped frequently. I've just submitted a patch set that restores the old behavior. [1] Fixes the problem on my test machine. Best regards Thomas [1] https://patchwork.freedesktop.org/series/66210/ > > Thanks, > Davidlohr -- Thomas Zimmermann Graphics Driver Developer SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany GF: Felix Imendörffer, Mary Higgins, Sri Rasiah HRB 21284 (AG Nürnberg)
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