From 217bbd81885587b462311fab1b04172926c59f1e Mon Sep 17 00:00:00 2001 From: Michael Schmitz Date: Mon, 1 Nov 2010 19:54:00 +0100 Subject: m68k/atari: Reserve some ST-RAM early on for device buffer use Based on an original patch from Michael Schmitz: Because mem_init() is now called before device init, devices that rely on ST-RAM may find all ST-RAM already allocated to other users by the time device init happens. In particular, a large initrd RAM disk may use up enough of ST-RAM to cause atari_stram_alloc() to resort to __get_dma_pages() allocation. In the current state of Atari memory management, all of RAM is marked DMA capable, so __get_dma_pages() may well return RAM that is not in actual fact DMA capable. Using this for frame buffer or SCSI DMA buffer causes subtle failure. The ST-RAM allocator has been changed to allocate memory from a pool of reserved ST-RAM of configurable size, set aside on ST-RAM init (i.e. before mem_init()). As long as this pool is not exhausted, allocation of real ST-RAM can be guaranteed. Other changes: - Replace the custom allocator in the ST-RAM pool by the existing allocator in the resource subsystem, - Remove mem_init_done and its hook, as memory init is now done before device init, - Remove /proc/stram, as ST-RAM usage now shows up under /proc/iomem, e.g. 005f2000-006f1fff : ST-RAM Pool 005f2000-0063dfff : atafb 0063e000-00641fff : ataflop 00642000-00642fff : SCSI Signed-off-by: Michael Schmitz [Andreas Schwab : Use memparse()] [Geert: Use the resource subsystem instead of a custom allocator] Signed-off-by: Geert Uytterhoeven --- arch/m68k/mm/init_mm.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'arch/m68k/mm') diff --git a/arch/m68k/mm/init_mm.c b/arch/m68k/mm/init_mm.c index 9113c2f17607..bbe525434ccb 100644 --- a/arch/m68k/mm/init_mm.c +++ b/arch/m68k/mm/init_mm.c @@ -83,11 +83,6 @@ void __init mem_init(void) int initpages = 0; int i; -#ifdef CONFIG_ATARI - if (MACH_IS_ATARI) - atari_stram_mem_init_hook(); -#endif - /* this will put all memory onto the freelists */ totalram_pages = num_physpages = 0; for_each_online_pgdat(pgdat) { -- cgit v1.2.3