mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 14:55:04 +07:00
217bbd8188
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>
17 lines
399 B
C
17 lines
399 B
C
#ifndef _M68K_ATARI_STRAM_H
|
|
#define _M68K_ATARI_STRAM_H
|
|
|
|
/*
|
|
* Functions for Atari ST-RAM management
|
|
*/
|
|
|
|
/* public interface */
|
|
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);
|
|
|
|
#endif /*_M68K_ATARI_STRAM_H */
|