Hi! So I recently got my new motherboard with a AGP port for continued development of 3Dfx KMS. Well this board comes with a built in VIA based IGP. Well that chipset is poorly supported so I started to work on the via drm driver. Currently I'm porting it to the TTM infrastructure. So the first step is a xxx_ttm_global_init. In fact I made a "generic" function for this. Will submit a patch at a later date. Second step was to create the ttm_bo_device via ttm_bo_device_init. This appears to be map to each graphics card in the system. After this you begin calling ttm_bo_init_mm for each different memory region of the card. So for the via chipset I managed to do this for the framebuffer,mmio region, and AGP. That was the easy part. Now I'm attemping to create the needed ttm_buffer_object for when the user request a memory region via ttm_bo_init, actually I'm using ttm_bo_create. So currently the driver fails to create the ttm_buffer_object due to having a invalid placement. To fix this issue I need to sort some things out. What I have noticed is in ttm_buffer_object we have a field, struct ttm_mem_reg mem, which appears to represent the region this ttm_buffer_object represents. We also have ttm_bus_placement which is apart of ttm_mem_reg. ttm_mem_reg represents some memory region handled by one of the ttm_mem_type_managers. Now the confusing part is ttm_bo_mem_compat. How does the placement relate to the ttm_mem_reg? Also I noticed in the radeon and nouveau driver you have something like this in a xxx_bo struct. strcut ttm_placement placement u32 placements[3]; u32 busy_placements[3]; Do each of those placements map to the different type of memory regions that where registered via ttm_bo_init_mm? If that is the case why are placements not apart of ttm_mem_type_manager. Their seems to be a relation to the ttm_mem_type_manager flags and the flags to the placements. Is this correct? Could then placements be generated from the flags of the ttm_mem_type_manager? _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
