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| author | Michael Schmitz <schmitzmic@googlemail.com> | 2010-11-01 19:54:00 +0100 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2011-07-30 21:21:39 +0200 |
| commit | 217bbd81885587b462311fab1b04172926c59f1e (patch) | |
| tree | c914306226654e239683e3c374c57ba85d9a5d9a /arch/m68k/include | |
| parent | m68k/amiga: Chip RAM - Use lookup_resource() (diff) | |
| download | linux-217bbd81885587b462311fab1b04172926c59f1e.tar.xz linux-217bbd81885587b462311fab1b04172926c59f1e.zip | |
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/include')
| -rw-r--r-- | arch/m68k/include/asm/atari_stram.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/m68k/include/asm/atari_stram.h b/arch/m68k/include/asm/atari_stram.h index 7546d13963be..62e27598af91 100644 --- a/arch/m68k/include/asm/atari_stram.h +++ b/arch/m68k/include/asm/atari_stram.h @@ -6,12 +6,11 @@ */ /* public interface */ -void *atari_stram_alloc(long size, const char *owner); +void *atari_stram_alloc(unsigned long size, const char *owner); void atari_stram_free(void *); /* functions called internally by other parts of the kernel */ void atari_stram_init(void); void atari_stram_reserve_pages(void *start_mem); -void atari_stram_mem_init_hook (void); #endif /*_M68K_ATARI_STRAM_H */ |