mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 18:20:53 +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>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*
|
|
* linux/arch/m68k/mm/init.c
|
|
*
|
|
* Copyright (C) 1995 Hamish Macdonald
|
|
*
|
|
* Contains common initialization routines, specific init code moved
|
|
* to motorola.c and sun3mmu.c
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/gfp.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/system.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/io.h>
|
|
#ifdef CONFIG_ATARI
|
|
#include <asm/atari_stram.h>
|
|
#endif
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
|
|
pg_data_t pg_data_map[MAX_NUMNODES];
|
|
EXPORT_SYMBOL(pg_data_map);
|
|
|
|
int m68k_virt_to_node_shift;
|
|
|
|
#ifndef CONFIG_SINGLE_MEMORY_CHUNK
|
|
pg_data_t *pg_data_table[65];
|
|
EXPORT_SYMBOL(pg_data_table);
|
|
#endif
|
|
|
|
void __init m68k_setup_node(int node)
|
|
{
|
|
#ifndef CONFIG_SINGLE_MEMORY_CHUNK
|
|
struct mem_info *info = m68k_memory + node;
|
|
int i, end;
|
|
|
|
i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
|
|
end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
|
|
for (; i <= end; i++) {
|
|
if (pg_data_table[i])
|
|
printk("overlap at %u for chunk %u\n", i, node);
|
|
pg_data_table[i] = pg_data_map + node;
|
|
}
|
|
#endif
|
|
pg_data_map[node].bdata = bootmem_node_data + node;
|
|
node_set_online(node);
|
|
}
|
|
|
|
|
|
/*
|
|
* ZERO_PAGE is a special page that is used for zero-initialized
|
|
* data and COW.
|
|
*/
|
|
|
|
void *empty_zero_page;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
extern void init_pointer_table(unsigned long ptable);
|
|
|
|
/* References to section boundaries */
|
|
|
|
extern pmd_t *zero_pgtable;
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
pg_data_t *pgdat;
|
|
int codepages = 0;
|
|
int datapages = 0;
|
|
int initpages = 0;
|
|
int i;
|
|
|
|
/* this will put all memory onto the freelists */
|
|
totalram_pages = num_physpages = 0;
|
|
for_each_online_pgdat(pgdat) {
|
|
num_physpages += pgdat->node_present_pages;
|
|
|
|
totalram_pages += free_all_bootmem_node(pgdat);
|
|
for (i = 0; i < pgdat->node_spanned_pages; i++) {
|
|
struct page *page = pgdat->node_mem_map + i;
|
|
char *addr = page_to_virt(page);
|
|
|
|
if (!PageReserved(page))
|
|
continue;
|
|
if (addr >= _text &&
|
|
addr < _etext)
|
|
codepages++;
|
|
else if (addr >= __init_begin &&
|
|
addr < __init_end)
|
|
initpages++;
|
|
else
|
|
datapages++;
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_SUN3
|
|
/* insert pointer tables allocated so far into the tablelist */
|
|
init_pointer_table((unsigned long)kernel_pg_dir);
|
|
for (i = 0; i < PTRS_PER_PGD; i++) {
|
|
if (pgd_present(kernel_pg_dir[i]))
|
|
init_pointer_table(__pgd_page(kernel_pg_dir[i]));
|
|
}
|
|
|
|
/* insert also pointer table that we used to unmap the zero page */
|
|
if (zero_pgtable)
|
|
init_pointer_table((unsigned long)zero_pgtable);
|
|
#endif
|
|
|
|
printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
|
|
nr_free_pages() << (PAGE_SHIFT-10),
|
|
totalram_pages << (PAGE_SHIFT-10),
|
|
codepages << (PAGE_SHIFT-10),
|
|
datapages << (PAGE_SHIFT-10),
|
|
initpages << (PAGE_SHIFT-10));
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
int pages = 0;
|
|
for (; start < end; start += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(start));
|
|
init_page_count(virt_to_page(start));
|
|
free_page(start);
|
|
totalram_pages++;
|
|
pages++;
|
|
}
|
|
printk ("Freeing initrd memory: %dk freed\n", pages);
|
|
}
|
|
#endif
|