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lib: zero-out memory allocated using sbi_scratch_alloc_offset()

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We should zero-out memory allocated from extra scratch space using
sbi_scratch_alloc_offset() API hence this patch. This will not
impact performance because we mostly allocate from extra scratch
space only at cold boot time.

Signed-off-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-01-03 14:55:04 +05:30
parent 15ed1e7452
commit 73c19e69f3
1 changed files with 17 additions and 0 deletions
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17
lib/sbi/sbi_scratch.c
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@@ -8,14 +8,21 @@
*/
#include <sbi/riscv_locks.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_scratch.h>
#include <sbi/sbi_string.h>
static spinlock_t extra_lock = SPIN_LOCK_INITIALIZER;
static unsigned long extra_offset = SBI_SCRATCH_EXTRA_SPACE_OFFSET;
unsigned long sbi_scratch_alloc_offset(unsigned long size, const char *owner)
{
u32 i;
void *ptr;
unsigned long ret = 0;
struct sbi_scratch *scratch, *rscratch;
const struct sbi_platform *plat;
/*
* We have a simple brain-dead allocator which never expects
@@ -43,6 +50,16 @@ unsigned long sbi_scratch_alloc_offset(unsigned long size, const char *owner)
done:
spin_unlock(&extra_lock);
if (ret) {
scratch = sbi_scratch_thishart_ptr();
plat = sbi_platform_ptr(scratch);
for (i = 0; i < sbi_platform_hart_count(plat); i++) {
rscratch = sbi_hart_id_to_scratch(scratch, i);
ptr = sbi_scratch_offset_ptr(rscratch, ret);
sbi_memset(ptr, 0, size);
}
}
return ret;
}