Commit 28b1c57d authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin

x86: Dynamically increase early_res array size

Use early_res_count to track the num, and use find_e820 to get a new
buffer, then copy from the old to the new one.

Also, clear early_res to prevent later invalid usage.

-v2 _check_and_double_early_res should take new start
Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-14-git-send-email-yinghai@kernel.org>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 264ebb18
......@@ -916,6 +916,48 @@ void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
__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.
*
......@@ -929,6 +971,8 @@ 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);
}
......@@ -957,6 +1001,10 @@ void __init early_res_to_bootmem(u64 start, u64 end)
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++) {
......@@ -974,6 +1022,11 @@ void __init early_res_to_bootmem(u64 start, u64 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;
}
/* Check for already reserved areas */
......
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