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authorMichael Schmitz <schmitzmic@googlemail.com>2010-11-01 19:54:00 +0100
committerGeert Uytterhoeven <geert@linux-m68k.org>2011-07-30 21:21:39 +0200
commit217bbd81885587b462311fab1b04172926c59f1e (patch)
treec914306226654e239683e3c374c57ba85d9a5d9a /arch/m68k/mm
parentb7785e954348465e1926d9c10ff3e49c207d4ec6 (diff)
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 <schmitz@debian.org> [Andreas Schwab <schwab@linux-m68k.org>: Use memparse()] [Geert: Use the resource subsystem instead of a custom allocator] Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/mm')
-rw-r--r--arch/m68k/mm/init_mm.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/m68k/mm/init_mm.c b/arch/m68k/mm/init_mm.c
index 9113c2f1760..bbe525434cc 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) {