x86: Separate early_res related code from e820.c
... to make e820.c smaller. -v2: fix 32bit compiling with MAX_DMA32_PFN Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <1265793639-15071-21-git-send-email-yinghai@kernel.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
parent
db8f77c889
commit
a678c2be75
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@ -109,19 +109,8 @@ static inline void early_memtest(unsigned long start, unsigned long end)
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extern unsigned long end_user_pfn;
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extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
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extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
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extern void reserve_early(u64 start, u64 end, char *name);
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extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
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extern void free_early(u64 start, u64 end);
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extern void early_res_to_bootmem(u64 start, u64 end);
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extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
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void reserve_early_without_check(u64 start, u64 end, char *name);
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u64 find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
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u64 size, u64 align);
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#include <linux/range.h>
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int get_free_all_memory_range(struct range **rangep, int nodeid);
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#include <asm/early_res.h>
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extern unsigned long e820_end_of_ram_pfn(void);
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extern unsigned long e820_end_of_low_ram_pfn(void);
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20
arch/x86/include/asm/early_res.h
Normal file
20
arch/x86/include/asm/early_res.h
Normal file
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@ -0,0 +1,20 @@
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#ifndef _ASM_X86_EARLY_RES_H
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#define _ASM_X86_EARLY_RES_H
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#ifdef __KERNEL__
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extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
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extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
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extern void reserve_early(u64 start, u64 end, char *name);
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extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
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extern void free_early(u64 start, u64 end);
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extern void early_res_to_bootmem(u64 start, u64 end);
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void reserve_early_without_check(u64 start, u64 end, char *name);
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u64 find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
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u64 size, u64 align);
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#include <linux/range.h>
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int get_free_all_memory_range(struct range **rangep, int nodeid);
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_EARLY_RES_H */
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@ -38,7 +38,7 @@ obj-$(CONFIG_X86_32) += probe_roms_32.o
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obj-$(CONFIG_X86_32) += sys_i386_32.o i386_ksyms_32.o
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obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
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obj-$(CONFIG_X86_64) += syscall_64.o vsyscall_64.o
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obj-y += bootflag.o e820.o
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obj-y += bootflag.o e820.o early_res.o
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obj-y += pci-dma.o quirks.o i8237.o topology.o kdebugfs.o
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obj-y += alternative.o i8253.o pci-nommu.o hw_breakpoint.o
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obj-y += tsc.o io_delay.o rtc.o
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@ -12,21 +12,14 @@
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/ioport.h>
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#include <linux/string.h>
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#include <linux/kexec.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/pfn.h>
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#include <linux/suspend.h>
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#include <linux/firmware-map.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/e820.h>
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#include <asm/early_res.h>
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#include <asm/proto.h>
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#include <asm/setup.h>
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#include <asm/trampoline.h>
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/*
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* The e820 map is the map that gets modified e.g. with command line parameters
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@ -729,538 +722,6 @@ static int __init e820_mark_nvs_memory(void)
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core_initcall(e820_mark_nvs_memory);
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#endif
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/*
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* Early reserved memory areas.
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*/
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/*
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* need to make sure this one is bigger enough before
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* find_e820_area could be used
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*/
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#define MAX_EARLY_RES_X 32
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struct early_res {
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u64 start, end;
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char name[15];
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char overlap_ok;
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};
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static struct early_res early_res_x[MAX_EARLY_RES_X] __initdata;
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static int max_early_res __initdata = MAX_EARLY_RES_X;
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static struct early_res *early_res __initdata = &early_res_x[0];
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static int early_res_count __initdata;
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static int __init find_overlapped_early(u64 start, u64 end)
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{
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int i;
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struct early_res *r;
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for (i = 0; i < max_early_res && early_res[i].end; i++) {
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r = &early_res[i];
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if (end > r->start && start < r->end)
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break;
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}
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return i;
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}
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/*
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* Drop the i-th range from the early reservation map,
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* by copying any higher ranges down one over it, and
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* clearing what had been the last slot.
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*/
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static void __init drop_range(int i)
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{
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int j;
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for (j = i + 1; j < max_early_res && early_res[j].end; j++)
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;
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memmove(&early_res[i], &early_res[i + 1],
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(j - 1 - i) * sizeof(struct early_res));
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early_res[j - 1].end = 0;
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early_res_count--;
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}
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/*
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* Split any existing ranges that:
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* 1) are marked 'overlap_ok', and
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* 2) overlap with the stated range [start, end)
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* into whatever portion (if any) of the existing range is entirely
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* below or entirely above the stated range. Drop the portion
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* of the existing range that overlaps with the stated range,
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* which will allow the caller of this routine to then add that
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* stated range without conflicting with any existing range.
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*/
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static void __init drop_overlaps_that_are_ok(u64 start, u64 end)
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{
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int i;
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struct early_res *r;
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u64 lower_start, lower_end;
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u64 upper_start, upper_end;
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char name[15];
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for (i = 0; i < max_early_res && early_res[i].end; i++) {
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r = &early_res[i];
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/* Continue past non-overlapping ranges */
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if (end <= r->start || start >= r->end)
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continue;
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/*
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* Leave non-ok overlaps as is; let caller
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* panic "Overlapping early reservations"
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* when it hits this overlap.
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*/
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if (!r->overlap_ok)
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return;
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/*
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* We have an ok overlap. We will drop it from the early
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* reservation map, and add back in any non-overlapping
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* portions (lower or upper) as separate, overlap_ok,
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* non-overlapping ranges.
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*/
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/* 1. Note any non-overlapping (lower or upper) ranges. */
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strncpy(name, r->name, sizeof(name) - 1);
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lower_start = lower_end = 0;
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upper_start = upper_end = 0;
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if (r->start < start) {
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lower_start = r->start;
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lower_end = start;
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}
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if (r->end > end) {
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upper_start = end;
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upper_end = r->end;
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}
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/* 2. Drop the original ok overlapping range */
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drop_range(i);
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i--; /* resume for-loop on copied down entry */
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/* 3. Add back in any non-overlapping ranges. */
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if (lower_end)
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reserve_early_overlap_ok(lower_start, lower_end, name);
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if (upper_end)
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reserve_early_overlap_ok(upper_start, upper_end, name);
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}
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}
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static void __init __reserve_early(u64 start, u64 end, char *name,
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int overlap_ok)
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{
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int i;
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struct early_res *r;
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i = find_overlapped_early(start, end);
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if (i >= max_early_res)
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panic("Too many early reservations");
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r = &early_res[i];
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if (r->end)
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panic("Overlapping early reservations "
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"%llx-%llx %s to %llx-%llx %s\n",
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start, end - 1, name?name:"", r->start,
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r->end - 1, r->name);
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r->start = start;
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r->end = end;
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r->overlap_ok = overlap_ok;
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if (name)
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strncpy(r->name, name, sizeof(r->name) - 1);
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early_res_count++;
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}
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/*
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* A few early reservtations come here.
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*
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* The 'overlap_ok' in the name of this routine does -not- mean it
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* is ok for these reservations to overlap an earlier reservation.
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* Rather it means that it is ok for subsequent reservations to
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* overlap this one.
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*
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* Use this entry point to reserve early ranges when you are doing
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* so out of "Paranoia", reserving perhaps more memory than you need,
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* just in case, and don't mind a subsequent overlapping reservation
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* that is known to be needed.
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*
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* The drop_overlaps_that_are_ok() call here isn't really needed.
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* It would be needed if we had two colliding 'overlap_ok'
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* reservations, so that the second such would not panic on the
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* overlap with the first. We don't have any such as of this
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* writing, but might as well tolerate such if it happens in
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* the future.
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*/
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void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
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{
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drop_overlaps_that_are_ok(start, end);
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__reserve_early(start, end, name, 1);
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}
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static void __init __check_and_double_early_res(u64 start)
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{
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u64 end, size, mem;
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struct early_res *new;
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/* do we have enough slots left ? */
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if ((max_early_res - early_res_count) > max(max_early_res/8, 2))
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return;
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/* double it */
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end = max_pfn_mapped << PAGE_SHIFT;
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size = sizeof(struct early_res) * max_early_res * 2;
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mem = find_e820_area(start, end, size, sizeof(struct early_res));
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if (mem == -1ULL)
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panic("can not find more space for early_res array");
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new = __va(mem);
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/* save the first one for own */
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new[0].start = mem;
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new[0].end = mem + size;
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new[0].overlap_ok = 0;
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/* copy old to new */
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if (early_res == early_res_x) {
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memcpy(&new[1], &early_res[0],
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sizeof(struct early_res) * max_early_res);
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memset(&new[max_early_res+1], 0,
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sizeof(struct early_res) * (max_early_res - 1));
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early_res_count++;
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} else {
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memcpy(&new[1], &early_res[1],
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sizeof(struct early_res) * (max_early_res - 1));
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memset(&new[max_early_res], 0,
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sizeof(struct early_res) * max_early_res);
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}
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memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
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early_res = new;
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max_early_res *= 2;
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printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n",
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max_early_res, mem, mem + size - 1);
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}
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/*
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* Most early reservations come here.
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*
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* We first have drop_overlaps_that_are_ok() drop any pre-existing
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* 'overlap_ok' ranges, so that we can then reserve this memory
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* range without risk of panic'ing on an overlapping overlap_ok
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* early reservation.
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*/
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void __init reserve_early(u64 start, u64 end, char *name)
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{
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if (start >= end)
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return;
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__check_and_double_early_res(end);
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drop_overlaps_that_are_ok(start, end);
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__reserve_early(start, end, name, 0);
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}
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void __init reserve_early_without_check(u64 start, u64 end, char *name)
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{
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struct early_res *r;
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if (start >= end)
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return;
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__check_and_double_early_res(end);
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r = &early_res[early_res_count];
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r->start = start;
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r->end = end;
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r->overlap_ok = 0;
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if (name)
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strncpy(r->name, name, sizeof(r->name) - 1);
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early_res_count++;
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}
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void __init free_early(u64 start, u64 end)
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{
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struct early_res *r;
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int i;
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i = find_overlapped_early(start, end);
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r = &early_res[i];
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if (i >= max_early_res || r->end != end || r->start != start)
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panic("free_early on not reserved area: %llx-%llx!",
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start, end - 1);
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drop_range(i);
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}
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#ifdef CONFIG_NO_BOOTMEM
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static void __init subtract_early_res(struct range *range, int az)
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{
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int i, count;
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u64 final_start, final_end;
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int idx = 0;
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count = 0;
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for (i = 0; i < max_early_res && early_res[i].end; i++)
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count++;
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/* need to skip first one ?*/
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if (early_res != early_res_x)
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idx = 1;
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#if 1
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printk(KERN_INFO "Subtract (%d early reservations)\n", count);
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#endif
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for (i = idx; i < count; i++) {
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struct early_res *r = &early_res[i];
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#if 0
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printk(KERN_INFO " #%d [%010llx - %010llx] %15s", i,
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r->start, r->end, r->name);
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#endif
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final_start = PFN_DOWN(r->start);
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final_end = PFN_UP(r->end);
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if (final_start >= final_end) {
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#if 0
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printk(KERN_CONT "\n");
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#endif
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continue;
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}
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#if 0
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printk(KERN_CONT " subtract pfn [%010llx - %010llx]\n",
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final_start, final_end);
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#endif
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subtract_range(range, az, final_start, final_end);
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}
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}
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int __init get_free_all_memory_range(struct range **rangep, int nodeid)
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{
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int i, count;
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u64 start = 0, end;
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u64 size;
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u64 mem;
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struct range *range;
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int nr_range;
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count = 0;
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for (i = 0; i < max_early_res && early_res[i].end; i++)
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count++;
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count *= 2;
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size = sizeof(struct range) * count;
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#ifdef MAX_DMA32_PFN
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if (max_pfn_mapped > MAX_DMA32_PFN)
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start = MAX_DMA32_PFN << PAGE_SHIFT;
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#endif
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end = max_pfn_mapped << PAGE_SHIFT;
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mem = find_e820_area(start, end, size, sizeof(struct range));
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if (mem == -1ULL)
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panic("can not find more space for range free");
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range = __va(mem);
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/* use early_node_map[] and early_res to get range array at first */
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memset(range, 0, size);
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nr_range = 0;
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/* need to go over early_node_map to find out good range for node */
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nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
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subtract_early_res(range, count);
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nr_range = clean_sort_range(range, count);
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/* need to clear it ? */
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if (nodeid == MAX_NUMNODES) {
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memset(&early_res[0], 0,
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sizeof(struct early_res) * max_early_res);
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early_res = NULL;
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max_early_res = 0;
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}
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*rangep = range;
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return nr_range;
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}
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#else
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void __init early_res_to_bootmem(u64 start, u64 end)
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{
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int i, count;
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u64 final_start, final_end;
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int idx = 0;
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count = 0;
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for (i = 0; i < max_early_res && early_res[i].end; i++)
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count++;
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/* need to skip first one ?*/
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if (early_res != early_res_x)
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idx = 1;
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printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n",
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count - idx, max_early_res, start, end);
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for (i = idx; i < count; i++) {
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struct early_res *r = &early_res[i];
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printk(KERN_INFO " #%d [%010llx - %010llx] %16s", i,
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r->start, r->end, r->name);
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final_start = max(start, r->start);
|
||||
final_end = min(end, r->end);
|
||||
if (final_start >= final_end) {
|
||||
printk(KERN_CONT "\n");
|
||||
continue;
|
||||
}
|
||||
printk(KERN_CONT " ==> [%010llx - %010llx]\n",
|
||||
final_start, final_end);
|
||||
reserve_bootmem_generic(final_start, final_end - final_start,
|
||||
BOOTMEM_DEFAULT);
|
||||
}
|
||||
/* clear them */
|
||||
memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
|
||||
early_res = NULL;
|
||||
max_early_res = 0;
|
||||
early_res_count = 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Check for already reserved areas */
|
||||
static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
|
||||
{
|
||||
int i;
|
||||
u64 addr = *addrp;
|
||||
int changed = 0;
|
||||
struct early_res *r;
|
||||
again:
|
||||
i = find_overlapped_early(addr, addr + size);
|
||||
r = &early_res[i];
|
||||
if (i < max_early_res && r->end) {
|
||||
*addrp = addr = round_up(r->end, align);
|
||||
changed = 1;
|
||||
goto again;
|
||||
}
|
||||
return changed;
|
||||
}
|
||||
|
||||
/* Check for already reserved areas */
|
||||
static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
|
||||
{
|
||||
int i;
|
||||
u64 addr = *addrp, last;
|
||||
u64 size = *sizep;
|
||||
int changed = 0;
|
||||
again:
|
||||
last = addr + size;
|
||||
for (i = 0; i < max_early_res && early_res[i].end; i++) {
|
||||
struct early_res *r = &early_res[i];
|
||||
if (last > r->start && addr < r->start) {
|
||||
size = r->start - addr;
|
||||
changed = 1;
|
||||
goto again;
|
||||
}
|
||||
if (last > r->end && addr < r->end) {
|
||||
addr = round_up(r->end, align);
|
||||
size = last - addr;
|
||||
changed = 1;
|
||||
goto again;
|
||||
}
|
||||
if (last <= r->end && addr >= r->start) {
|
||||
(*sizep)++;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
if (changed) {
|
||||
*addrp = addr;
|
||||
*sizep = size;
|
||||
}
|
||||
return changed;
|
||||
}
|
||||
|
||||
/*
|
||||
* Find a free area with specified alignment in a specific range.
|
||||
* only with the area.between start to end is active range from early_node_map
|
||||
* so they are good as RAM
|
||||
*/
|
||||
u64 __init find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
|
||||
u64 size, u64 align)
|
||||
{
|
||||
u64 addr, last;
|
||||
|
||||
addr = round_up(ei_start, align);
|
||||
if (addr < start)
|
||||
addr = round_up(start, align);
|
||||
if (addr >= ei_last)
|
||||
goto out;
|
||||
while (bad_addr(&addr, size, align) && addr+size <= ei_last)
|
||||
;
|
||||
last = addr + size;
|
||||
if (last > ei_last)
|
||||
goto out;
|
||||
if (last > end)
|
||||
goto out;
|
||||
|
||||
return addr;
|
||||
|
||||
out:
|
||||
return -1ULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Find a free area with specified alignment in a specific range.
|
||||
*/
|
||||
u64 __init find_e820_area(u64 start, u64 end, u64 size, u64 align)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < e820.nr_map; i++) {
|
||||
struct e820entry *ei = &e820.map[i];
|
||||
u64 addr;
|
||||
u64 ei_start, ei_last;
|
||||
|
||||
if (ei->type != E820_RAM)
|
||||
continue;
|
||||
|
||||
ei_last = ei->addr + ei->size;
|
||||
ei_start = ei->addr;
|
||||
addr = find_early_area(ei_start, ei_last, start, end,
|
||||
size, align);
|
||||
|
||||
if (addr == -1ULL)
|
||||
continue;
|
||||
|
||||
return addr;
|
||||
}
|
||||
return -1ULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Find next free range after *start
|
||||
*/
|
||||
u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < e820.nr_map; i++) {
|
||||
struct e820entry *ei = &e820.map[i];
|
||||
u64 addr, last;
|
||||
u64 ei_last;
|
||||
|
||||
if (ei->type != E820_RAM)
|
||||
continue;
|
||||
addr = round_up(ei->addr, align);
|
||||
ei_last = ei->addr + ei->size;
|
||||
if (addr < start)
|
||||
addr = round_up(start, align);
|
||||
if (addr >= ei_last)
|
||||
continue;
|
||||
*sizep = ei_last - addr;
|
||||
while (bad_addr_size(&addr, sizep, align) &&
|
||||
addr + *sizep <= ei_last)
|
||||
;
|
||||
last = addr + *sizep;
|
||||
if (last > ei_last)
|
||||
continue;
|
||||
return addr;
|
||||
}
|
||||
|
||||
return -1ULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* pre allocated 4k and reserved it in e820
|
||||
*/
|
||||
|
|
538
arch/x86/kernel/early_res.c
Normal file
538
arch/x86/kernel/early_res.c
Normal file
|
@ -0,0 +1,538 @@
|
|||
/*
|
||||
* early_res, could be used to replace bootmem
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/bootmem.h>
|
||||
#include <linux/mm.h>
|
||||
|
||||
#include <asm/e820.h>
|
||||
#include <asm/early_res.h>
|
||||
#include <asm/proto.h>
|
||||
|
||||
/*
|
||||
* Early reserved memory areas.
|
||||
*/
|
||||
/*
|
||||
* need to make sure this one is bigger enough before
|
||||
* find_e820_area could be used
|
||||
*/
|
||||
#define MAX_EARLY_RES_X 32
|
||||
|
||||
struct early_res {
|
||||
u64 start, end;
|
||||
char name[15];
|
||||
char overlap_ok;
|
||||
};
|
||||
static struct early_res early_res_x[MAX_EARLY_RES_X] __initdata;
|
||||
|
||||
static int max_early_res __initdata = MAX_EARLY_RES_X;
|
||||
static struct early_res *early_res __initdata = &early_res_x[0];
|
||||
static int early_res_count __initdata;
|
||||
|
||||
static int __init find_overlapped_early(u64 start, u64 end)
|
||||
{
|
||||
int i;
|
||||
struct early_res *r;
|
||||
|
||||
for (i = 0; i < max_early_res && early_res[i].end; i++) {
|
||||
r = &early_res[i];
|
||||
if (end > r->start && start < r->end)
|
||||
break;
|
||||
}
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
/*
|
||||
* Drop the i-th range from the early reservation map,
|
||||
* by copying any higher ranges down one over it, and
|
||||
* clearing what had been the last slot.
|
||||
*/
|
||||
static void __init drop_range(int i)
|
||||
{
|
||||
int j;
|
||||
|
||||
for (j = i + 1; j < max_early_res && early_res[j].end; j++)
|
||||
;
|
||||
|
||||
memmove(&early_res[i], &early_res[i + 1],
|
||||
(j - 1 - i) * sizeof(struct early_res));
|
||||
|
||||
early_res[j - 1].end = 0;
|
||||
early_res_count--;
|
||||
}
|
||||
|
||||
/*
|
||||
* Split any existing ranges that:
|
||||
* 1) are marked 'overlap_ok', and
|
||||
* 2) overlap with the stated range [start, end)
|
||||
* into whatever portion (if any) of the existing range is entirely
|
||||
* below or entirely above the stated range. Drop the portion
|
||||
* of the existing range that overlaps with the stated range,
|
||||
* which will allow the caller of this routine to then add that
|
||||
* stated range without conflicting with any existing range.
|
||||
*/
|
||||
static void __init drop_overlaps_that_are_ok(u64 start, u64 end)
|
||||
{
|
||||
int i;
|
||||
struct early_res *r;
|
||||
u64 lower_start, lower_end;
|
||||
u64 upper_start, upper_end;
|
||||
char name[15];
|
||||
|
||||
for (i = 0; i < max_early_res && early_res[i].end; i++) {
|
||||
r = &early_res[i];
|
||||
|
||||
/* Continue past non-overlapping ranges */
|
||||
if (end <= r->start || start >= r->end)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* Leave non-ok overlaps as is; let caller
|
||||
* panic "Overlapping early reservations"
|
||||
* when it hits this overlap.
|
||||
*/
|
||||
if (!r->overlap_ok)
|
||||
return;
|
||||
|
||||
/*
|
||||
* We have an ok overlap. We will drop it from the early
|
||||
* reservation map, and add back in any non-overlapping
|
||||
* portions (lower or upper) as separate, overlap_ok,
|
||||
* non-overlapping ranges.
|
||||
*/
|
||||
|
||||
/* 1. Note any non-overlapping (lower or upper) ranges. */
|
||||
strncpy(name, r->name, sizeof(name) - 1);
|
||||
|
||||
lower_start = lower_end = 0;
|
||||
upper_start = upper_end = 0;
|
||||
if (r->start < start) {
|
||||
lower_start = r->start;
|
||||
lower_end = start;
|
||||
}
|
||||
if (r->end > end) {
|
||||
upper_start = end;
|
||||
upper_end = r->end;
|
||||
}
|
||||
|
||||
/* 2. Drop the original ok overlapping range */
|
||||
drop_range(i);
|
||||
|
||||
i--; /* resume for-loop on copied down entry */
|
||||
|
||||
/* 3. Add back in any non-overlapping ranges. */
|
||||
if (lower_end)
|
||||
reserve_early_overlap_ok(lower_start, lower_end, name);
|
||||
if (upper_end)
|
||||
reserve_early_overlap_ok(upper_start, upper_end, name);
|
||||
}
|
||||
}
|
||||
|
||||
static void __init __reserve_early(u64 start, u64 end, char *name,
|
||||
int overlap_ok)
|
||||
{
|
||||
int i;
|
||||
struct early_res *r;
|
||||
|
||||
i = find_overlapped_early(start, end);
|
||||
if (i >= max_early_res)
|
||||
panic("Too many early reservations");
|
||||
r = &early_res[i];
|
||||
if (r->end)
|
||||
panic("Overlapping early reservations "
|
||||
"%llx-%llx %s to %llx-%llx %s\n",
|
||||
start, end - 1, name ? name : "", r->start,
|
||||
r->end - 1, r->name);
|
||||
r->start = start;
|
||||
r->end = end;
|
||||
r->overlap_ok = overlap_ok;
|
||||
if (name)
|
||||
strncpy(r->name, name, sizeof(r->name) - 1);
|
||||
early_res_count++;
|
||||
}
|
||||
|
||||
/*
|
||||
* A few early reservtations come here.
|
||||
*
|
||||
* The 'overlap_ok' in the name of this routine does -not- mean it
|
||||
* is ok for these reservations to overlap an earlier reservation.
|
||||
* Rather it means that it is ok for subsequent reservations to
|
||||
* overlap this one.
|
||||
*
|
||||
* Use this entry point to reserve early ranges when you are doing
|
||||
* so out of "Paranoia", reserving perhaps more memory than you need,
|
||||
* just in case, and don't mind a subsequent overlapping reservation
|
||||
* that is known to be needed.
|
||||
*
|
||||
* The drop_overlaps_that_are_ok() call here isn't really needed.
|
||||
* It would be needed if we had two colliding 'overlap_ok'
|
||||
* reservations, so that the second such would not panic on the
|
||||
* overlap with the first. We don't have any such as of this
|
||||
* writing, but might as well tolerate such if it happens in
|
||||
* the future.
|
||||
*/
|
||||
void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
|
||||
{
|
||||
drop_overlaps_that_are_ok(start, end);
|
||||
__reserve_early(start, end, name, 1);
|
||||
}
|
||||
|
||||
static void __init __check_and_double_early_res(u64 start)
|
||||
{
|
||||
u64 end, size, mem;
|
||||
struct early_res *new;
|
||||
|
||||
/* do we have enough slots left ? */
|
||||
if ((max_early_res - early_res_count) > max(max_early_res/8, 2))
|
||||
return;
|
||||
|
||||
/* double it */
|
||||
end = max_pfn_mapped << PAGE_SHIFT;
|
||||
size = sizeof(struct early_res) * max_early_res * 2;
|
||||
mem = find_e820_area(start, end, size, sizeof(struct early_res));
|
||||
|
||||
if (mem == -1ULL)
|
||||
panic("can not find more space for early_res array");
|
||||
|
||||
new = __va(mem);
|
||||
/* save the first one for own */
|
||||
new[0].start = mem;
|
||||
new[0].end = mem + size;
|
||||
new[0].overlap_ok = 0;
|
||||
/* copy old to new */
|
||||
if (early_res == early_res_x) {
|
||||
memcpy(&new[1], &early_res[0],
|
||||
sizeof(struct early_res) * max_early_res);
|
||||
memset(&new[max_early_res+1], 0,
|
||||
sizeof(struct early_res) * (max_early_res - 1));
|
||||
early_res_count++;
|
||||
} else {
|
||||
memcpy(&new[1], &early_res[1],
|
||||
sizeof(struct early_res) * (max_early_res - 1));
|
||||
memset(&new[max_early_res], 0,
|
||||
sizeof(struct early_res) * max_early_res);
|
||||
}
|
||||
memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
|
||||
early_res = new;
|
||||
max_early_res *= 2;
|
||||
printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n",
|
||||
max_early_res, mem, mem + size - 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Most early reservations come here.
|
||||
*
|
||||
* We first have drop_overlaps_that_are_ok() drop any pre-existing
|
||||
* 'overlap_ok' ranges, so that we can then reserve this memory
|
||||
* range without risk of panic'ing on an overlapping overlap_ok
|
||||
* early reservation.
|
||||
*/
|
||||
void __init reserve_early(u64 start, u64 end, char *name)
|
||||
{
|
||||
if (start >= end)
|
||||
return;
|
||||
|
||||
__check_and_double_early_res(end);
|
||||
|
||||
drop_overlaps_that_are_ok(start, end);
|
||||
__reserve_early(start, end, name, 0);
|
||||
}
|
||||
|
||||
void __init reserve_early_without_check(u64 start, u64 end, char *name)
|
||||
{
|
||||
struct early_res *r;
|
||||
|
||||
if (start >= end)
|
||||
return;
|
||||
|
||||
__check_and_double_early_res(end);
|
||||
|
||||
r = &early_res[early_res_count];
|
||||
|
||||
r->start = start;
|
||||
r->end = end;
|
||||
r->overlap_ok = 0;
|
||||
if (name)
|
||||
strncpy(r->name, name, sizeof(r->name) - 1);
|
||||
early_res_count++;
|
||||
}
|
||||
|
||||
void __init free_early(u64 start, u64 end)
|
||||
{
|
||||
struct early_res *r;
|
||||
int i;
|
||||
|
||||
i = find_overlapped_early(start, end);
|
||||
r = &early_res[i];
|
||||
if (i >= max_early_res || r->end != end || r->start != start)
|
||||
panic("free_early on not reserved area: %llx-%llx!",
|
||||
start, end - 1);
|
||||
|
||||
drop_range(i);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NO_BOOTMEM
|
||||
static void __init subtract_early_res(struct range *range, int az)
|
||||
{
|
||||
int i, count;
|
||||
u64 final_start, final_end;
|
||||
int idx = 0;
|
||||
|
||||
count = 0;
|
||||
for (i = 0; i < max_early_res && early_res[i].end; i++)
|
||||
count++;
|
||||
|
||||
/* need to skip first one ?*/
|
||||
if (early_res != early_res_x)
|
||||
idx = 1;
|
||||
|
||||
#define DEBUG_PRINT_EARLY_RES 1
|
||||
|
||||
#if DEBUG_PRINT_EARLY_RES
|
||||
printk(KERN_INFO "Subtract (%d early reservations)\n", count);
|
||||
#endif
|
||||
for (i = idx; i < count; i++) {
|
||||
struct early_res *r = &early_res[i];
|
||||
#if DEBUG_PRINT_EARLY_RES
|
||||
printk(KERN_INFO " #%d [%010llx - %010llx] %15s\n", i,
|
||||
r->start, r->end, r->name);
|
||||
#endif
|
||||
final_start = PFN_DOWN(r->start);
|
||||
final_end = PFN_UP(r->end);
|
||||
if (final_start >= final_end)
|
||||
continue;
|
||||
subtract_range(range, az, final_start, final_end);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
int __init get_free_all_memory_range(struct range **rangep, int nodeid)
|
||||
{
|
||||
int i, count;
|
||||
u64 start = 0, end;
|
||||
u64 size;
|
||||
u64 mem;
|
||||
struct range *range;
|
||||
int nr_range;
|
||||
|
||||
count = 0;
|
||||
for (i = 0; i < max_early_res && early_res[i].end; i++)
|
||||
count++;
|
||||
|
||||
count *= 2;
|
||||
|
||||
size = sizeof(struct range) * count;
|
||||
#ifdef MAX_DMA32_PFN
|
||||
if (max_pfn_mapped > MAX_DMA32_PFN)
|
||||
start = MAX_DMA32_PFN << PAGE_SHIFT;
|
||||
#endif
|
||||
end = max_pfn_mapped << PAGE_SHIFT;
|
||||
mem = find_e820_area(start, end, size, sizeof(struct range));
|
||||
if (mem == -1ULL)
|
||||
panic("can not find more space for range free");
|
||||
|
||||
range = __va(mem);
|
||||
/* use early_node_map[] and early_res to get range array at first */
|
||||
memset(range, 0, size);
|
||||
nr_range = 0;
|
||||
|
||||
/* need to go over early_node_map to find out good range for node */
|
||||
nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
|
||||
subtract_early_res(range, count);
|
||||
nr_range = clean_sort_range(range, count);
|
||||
|
||||
/* need to clear it ? */
|
||||
if (nodeid == MAX_NUMNODES) {
|
||||
memset(&early_res[0], 0,
|
||||
sizeof(struct early_res) * max_early_res);
|
||||
early_res = NULL;
|
||||
max_early_res = 0;
|
||||
}
|
||||
|
||||
*rangep = range;
|
||||
return nr_range;
|
||||
}
|
||||
#else
|
||||
void __init early_res_to_bootmem(u64 start, u64 end)
|
||||
{
|
||||
int i, count;
|
||||
u64 final_start, final_end;
|
||||
int idx = 0;
|
||||
|
||||
count = 0;
|
||||
for (i = 0; i < max_early_res && early_res[i].end; i++)
|
||||
count++;
|
||||
|
||||
/* need to skip first one ?*/
|
||||
if (early_res != early_res_x)
|
||||
idx = 1;
|
||||
|
||||
printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n",
|
||||
count - idx, max_early_res, start, end);
|
||||
for (i = idx; i < count; i++) {
|
||||
struct early_res *r = &early_res[i];
|
||||
printk(KERN_INFO " #%d [%010llx - %010llx] %16s", i,
|
||||
r->start, r->end, r->name);
|
||||
final_start = max(start, r->start);
|
||||
final_end = min(end, r->end);
|
||||
if (final_start >= final_end) {
|
||||
printk(KERN_CONT "\n");
|
||||
continue;
|
||||
}
|
||||
printk(KERN_CONT " ==> [%010llx - %010llx]\n",
|
||||
final_start, final_end);
|
||||
reserve_bootmem_generic(final_start, final_end - final_start,
|
||||
BOOTMEM_DEFAULT);
|
||||
}
|
||||
/* clear them */
|
||||
memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
|
||||
early_res = NULL;
|
||||
max_early_res = 0;
|
||||
early_res_count = 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Check for already reserved areas */
|
||||
static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
|
||||
{
|
||||
int i;
|
||||
u64 addr = *addrp;
|
||||
int changed = 0;
|
||||
struct early_res *r;
|
||||
again:
|
||||
i = find_overlapped_early(addr, addr + size);
|
||||
r = &early_res[i];
|
||||
if (i < max_early_res && r->end) {
|
||||
*addrp = addr = round_up(r->end, align);
|
||||
changed = 1;
|
||||
goto again;
|
||||
}
|
||||
return changed;
|
||||
}
|
||||
|
||||
/* Check for already reserved areas */
|
||||
static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
|
||||
{
|
||||
int i;
|
||||
u64 addr = *addrp, last;
|
||||
u64 size = *sizep;
|
||||
int changed = 0;
|
||||
again:
|
||||
last = addr + size;
|
||||
for (i = 0; i < max_early_res && early_res[i].end; i++) {
|
||||
struct early_res *r = &early_res[i];
|
||||
if (last > r->start && addr < r->start) {
|
||||
size = r->start - addr;
|
||||
changed = 1;
|
||||
goto again;
|
||||
}
|
||||
if (last > r->end && addr < r->end) {
|
||||
addr = round_up(r->end, align);
|
||||
size = last - addr;
|
||||
changed = 1;
|
||||
goto again;
|
||||
}
|
||||
if (last <= r->end && addr >= r->start) {
|
||||
(*sizep)++;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
if (changed) {
|
||||
*addrp = addr;
|
||||
*sizep = size;
|
||||
}
|
||||
return changed;
|
||||
}
|
||||
|
||||
/*
|
||||
* Find a free area with specified alignment in a specific range.
|
||||
* only with the area.between start to end is active range from early_node_map
|
||||
* so they are good as RAM
|
||||
*/
|
||||
u64 __init find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
|
||||
u64 size, u64 align)
|
||||
{
|
||||
u64 addr, last;
|
||||
|
||||
addr = round_up(ei_start, align);
|
||||
if (addr < start)
|
||||
addr = round_up(start, align);
|
||||
if (addr >= ei_last)
|
||||
goto out;
|
||||
while (bad_addr(&addr, size, align) && addr+size <= ei_last)
|
||||
;
|
||||
last = addr + size;
|
||||
if (last > ei_last)
|
||||
goto out;
|
||||
if (last > end)
|
||||
goto out;
|
||||
|
||||
return addr;
|
||||
|
||||
out:
|
||||
return -1ULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Find a free area with specified alignment in a specific range.
|
||||
*/
|
||||
u64 __init find_e820_area(u64 start, u64 end, u64 size, u64 align)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < e820.nr_map; i++) {
|
||||
struct e820entry *ei = &e820.map[i];
|
||||
u64 addr;
|
||||
u64 ei_start, ei_last;
|
||||
|
||||
if (ei->type != E820_RAM)
|
||||
continue;
|
||||
|
||||
ei_last = ei->addr + ei->size;
|
||||
ei_start = ei->addr;
|
||||
addr = find_early_area(ei_start, ei_last, start, end,
|
||||
size, align);
|
||||
|
||||
if (addr == -1ULL)
|
||||
continue;
|
||||
|
||||
return addr;
|
||||
}
|
||||
return -1ULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Find next free range after *start
|
||||
*/
|
||||
u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < e820.nr_map; i++) {
|
||||
struct e820entry *ei = &e820.map[i];
|
||||
u64 addr, last;
|
||||
u64 ei_last;
|
||||
|
||||
if (ei->type != E820_RAM)
|
||||
continue;
|
||||
addr = round_up(ei->addr, align);
|
||||
ei_last = ei->addr + ei->size;
|
||||
if (addr < start)
|
||||
addr = round_up(start, align);
|
||||
if (addr >= ei_last)
|
||||
continue;
|
||||
*sizep = ei_last - addr;
|
||||
while (bad_addr_size(&addr, sizep, align) &&
|
||||
addr + *sizep <= ei_last)
|
||||
;
|
||||
last = addr + *sizep;
|
||||
if (last > ei_last)
|
||||
continue;
|
||||
return addr;
|
||||
}
|
||||
|
||||
return -1ULL;
|
||||
}
|
Loading…
Reference in a new issue