提交 d1112018 编写于 作者: D David S. Miller

[SPARC64]: Move over to sparsemem.

This has been pending for a long time, and the fact
that we waste a ton of ram on some configurations
kind of pushed things over the edge.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 ee29074d
......@@ -186,6 +186,12 @@ endchoice
endmenu
config ARCH_SPARSEMEM_ENABLE
def_bool y
config ARCH_SPARSEMEM_DEFAULT
def_bool y
source "mm/Kconfig"
config GENERIC_ISA_DMA
......
......@@ -95,9 +95,6 @@ extern int __ashrdi3(int, int);
extern int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs);
extern unsigned long phys_base;
extern unsigned long pfn_base;
extern unsigned int sys_call_table[];
extern void xor_vis_2(unsigned long, unsigned long *, unsigned long *);
......@@ -346,11 +343,7 @@ EXPORT_SYMBOL(__strncpy_from_user);
EXPORT_SYMBOL(__clear_user);
/* Various address conversion macros use this. */
EXPORT_SYMBOL(phys_base);
EXPORT_SYMBOL(pfn_base);
EXPORT_SYMBOL(sparc64_valid_addr_bitmap);
EXPORT_SYMBOL(page_to_pfn);
EXPORT_SYMBOL(pfn_to_page);
/* No version information on this, heavily used in inline asm,
* and will always be 'void __ret_efault(void)'.
......
......@@ -130,11 +130,9 @@ static void __init read_obp_memory(const char *property,
unsigned long *sparc64_valid_addr_bitmap __read_mostly;
/* Ugly, but necessary... -DaveM */
unsigned long phys_base __read_mostly;
/* Kernel physical address base and size in bytes. */
unsigned long kern_base __read_mostly;
unsigned long kern_size __read_mostly;
unsigned long pfn_base __read_mostly;
/* get_new_mmu_context() uses "cache + 1". */
DEFINE_SPINLOCK(ctx_alloc_lock);
......@@ -368,16 +366,6 @@ void __kprobes flush_icache_range(unsigned long start, unsigned long end)
}
}
unsigned long page_to_pfn(struct page *page)
{
return (unsigned long) ((page - mem_map) + pfn_base);
}
struct page *pfn_to_page(unsigned long pfn)
{
return (mem_map + (pfn - pfn_base));
}
void show_mem(void)
{
printk("Mem-info:\n");
......@@ -773,9 +761,78 @@ void sparc_ultra_dump_dtlb(void)
extern unsigned long cmdline_memory_size;
unsigned long __init bootmem_init(unsigned long *pages_avail)
/* Find a free area for the bootmem map, avoiding the kernel image
* and the initial ramdisk.
*/
static unsigned long __init choose_bootmap_pfn(unsigned long start_pfn,
unsigned long end_pfn)
{
unsigned long bootmap_size, start_pfn, end_pfn;
unsigned long avoid_start, avoid_end, bootmap_size;
int i;
bootmap_size = ((end_pfn - start_pfn) + 7) / 8;
bootmap_size = ALIGN(bootmap_size, sizeof(long));
avoid_start = avoid_end = 0;
#ifdef CONFIG_BLK_DEV_INITRD
avoid_start = initrd_start;
avoid_end = PAGE_ALIGN(initrd_end);
#endif
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("choose_bootmap_pfn: kern[%lx:%lx] avoid[%lx:%lx]\n",
kern_base, PAGE_ALIGN(kern_base + kern_size),
avoid_start, avoid_end);
#endif
for (i = 0; i < pavail_ents; i++) {
unsigned long start, end;
start = pavail[i].phys_addr;
end = start + pavail[i].reg_size;
while (start < end) {
if (start >= kern_base &&
start < PAGE_ALIGN(kern_base + kern_size)) {
start = PAGE_ALIGN(kern_base + kern_size);
continue;
}
if (start >= avoid_start && start < avoid_end) {
start = avoid_end;
continue;
}
if ((end - start) < bootmap_size)
break;
if (start < kern_base &&
(start + bootmap_size) > kern_base) {
start = PAGE_ALIGN(kern_base + kern_size);
continue;
}
if (start < avoid_start &&
(start + bootmap_size) > avoid_start) {
start = avoid_end;
continue;
}
/* OK, it doesn't overlap anything, use it. */
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("choose_bootmap_pfn: Using %lx [%lx]\n",
start >> PAGE_SHIFT, start);
#endif
return start >> PAGE_SHIFT;
}
}
prom_printf("Cannot find free area for bootmap, aborting.\n");
prom_halt();
}
static unsigned long __init bootmem_init(unsigned long *pages_avail,
unsigned long phys_base)
{
unsigned long bootmap_size, end_pfn;
unsigned long end_of_phys_memory = 0UL;
unsigned long bootmap_pfn, bytes_avail, size;
int i;
......@@ -813,14 +870,6 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
*pages_avail = bytes_avail >> PAGE_SHIFT;
/* Start with page aligned address of last symbol in kernel
* image. The kernel is hard mapped below PAGE_OFFSET in a
* 4MB locked TLB translation.
*/
start_pfn = PAGE_ALIGN(kern_base + kern_size) >> PAGE_SHIFT;
bootmap_pfn = start_pfn;
end_pfn = end_of_phys_memory >> PAGE_SHIFT;
#ifdef CONFIG_BLK_DEV_INITRD
......@@ -837,23 +886,23 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
initrd_end, end_of_phys_memory);
initrd_start = 0;
}
if (initrd_start) {
if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
initrd_end = 0;
}
}
#endif
/* Initialize the boot-time allocator. */
max_pfn = max_low_pfn = end_pfn;
min_low_pfn = pfn_base;
min_low_pfn = (phys_base >> PAGE_SHIFT);
bootmap_pfn = choose_bootmap_pfn(min_low_pfn, end_pfn);
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("init_bootmem(min[%lx], bootmap[%lx], max[%lx])\n",
min_low_pfn, bootmap_pfn, max_low_pfn);
#endif
bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, end_pfn);
bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn,
(phys_base >> PAGE_SHIFT),
end_pfn);
/* Now register the available physical memory with the
* allocator.
......@@ -901,6 +950,20 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
for (i = 0; i < pavail_ents; i++) {
unsigned long start_pfn, end_pfn;
start_pfn = pavail[i].phys_addr >> PAGE_SHIFT;
end_pfn = (start_pfn + (pavail[i].reg_size >> PAGE_SHIFT));
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("memory_present(0, %lx, %lx)\n",
start_pfn, end_pfn);
#endif
memory_present(0, start_pfn, end_pfn);
}
sparse_init();
return end_pfn;
}
......@@ -1180,7 +1243,7 @@ static void sun4v_pgprot_init(void);
void __init paging_init(void)
{
unsigned long end_pfn, pages_avail, shift;
unsigned long end_pfn, pages_avail, shift, phys_base;
unsigned long real_end, i;
kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
......@@ -1211,8 +1274,6 @@ void __init paging_init(void)
for (i = 0; i < pavail_ents; i++)
phys_base = min(phys_base, pavail[i].phys_addr);
pfn_base = phys_base >> PAGE_SHIFT;
set_bit(0, mmu_context_bmap);
shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE);
......@@ -1248,7 +1309,9 @@ void __init paging_init(void)
/* Setup bootmem... */
pages_avail = 0;
last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
last_valid_pfn = end_pfn = bootmem_init(&pages_avail, phys_base);
max_mapnr = last_valid_pfn - (phys_base >> PAGE_SHIFT);
kernel_physical_mapping_init();
......@@ -1261,7 +1324,7 @@ void __init paging_init(void)
for (znum = 0; znum < MAX_NR_ZONES; znum++)
zones_size[znum] = zholes_size[znum] = 0;
npages = end_pfn - pfn_base;
npages = end_pfn - (phys_base >> PAGE_SHIFT);
zones_size[ZONE_DMA] = npages;
zholes_size[ZONE_DMA] = npages - pages_avail;
......@@ -1336,7 +1399,6 @@ void __init mem_init(void)
taint_real_pages();
max_mapnr = last_valid_pfn - pfn_base;
high_memory = __va(last_valid_pfn << PAGE_SHIFT);
#ifdef CONFIG_DEBUG_BOOTMEM
......
#ifndef _SPARC64_NUMNODES_H
#define _SPARC64_NUMNODES_H
#define NODES_SHIFT 0
#endif /* !(_SPARC64_NUMNODES_H) */
......@@ -125,17 +125,10 @@ typedef unsigned long pgprot_t;
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
/* PFNs are real physical page numbers. However, mem_map only begins to record
* per-page information starting at pfn_base. This is to handle systems where
* the first physical page in the machine is at some huge physical address,
* such as 4GB. This is common on a partitioned E10000, for example.
*/
extern struct page *pfn_to_page(unsigned long pfn);
extern unsigned long page_to_pfn(struct page *);
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
#define pfn_valid(pfn) (((pfn)-(pfn_base)) < max_mapnr)
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define virt_to_phys __pa
......
......@@ -217,9 +217,6 @@ extern unsigned long pg_iobits;
extern unsigned long _PAGE_ALL_SZ_BITS;
extern unsigned long _PAGE_SZBITS;
extern unsigned long phys_base;
extern unsigned long pfn_base;
extern struct page *mem_map_zero;
#define ZERO_PAGE(vaddr) (mem_map_zero)
......
#ifndef _SPARC64_SPARSEMEM_H
#define _SPARC64_SPARSEMEM_H
#ifdef __KERNEL__
#define SECTION_SIZE_BITS 26
#define MAX_PHYSADDR_BITS 42
#define MAX_PHYSMEM_BITS 42
#endif /* !(__KERNEL__) */
#endif /* !(_SPARC64_SPARSEMEM_H) */
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