Hi Am 27.06.19 um 14:23 schrieb Gerd Hoffmann: > drm clients like the generic framebuffer emulation keep a permanent > vmap active, which in turn has a permanent pin. This pin needs to > be in vram, otherwise we can't display the framebuffer. > > Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> > --- > drivers/gpu/drm/drm_gem_vram_helper.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c > index 4de782ca26b2..c724876c6f2a 100644 > --- a/drivers/gpu/drm/drm_gem_vram_helper.c > +++ b/drivers/gpu/drm/drm_gem_vram_helper.c > @@ -592,7 +592,7 @@ void *drm_gem_vram_driver_gem_prime_vmap(struct drm_gem_object *gem) > int ret; > void *base; > > - ret = drm_gem_vram_pin(gbo, 0); > + ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM); I have a patch set that converts ast and mgag200 to generic framebuffer emulation with a shadow FB. The actual BO is mapped by the fbdev code on demand to update its content. Permanently mapping the fb console's BO would consume too much display memory. This requires the pin function's placement flag to be 0, so the BO is mapped in system memory by default. The proposed patch breaks this. Some ideas for solving this: 1) Introduce a default_placement field in struct drm_gem_vram_helper where this flag can be configured. I'd favor this option. 2) Introduce a separate callback function for pinning to vram. The driver would have to set the correct function pointers. 3) Pin the fb console buffer manually from within the bochs driver. Best regards Thomas > if (ret) > return NULL; > base = drm_gem_vram_kmap(gbo, true, NULL); > -- 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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