/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/riscv_locks.h>
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#include <sbi/sbi_hart.h>
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#include <sbi/sbi_hartmask.h>
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#include <sbi/sbi_platform.h>
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#include <sbi/sbi_scratch.h>
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#include <sbi/sbi_string.h>
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u32 last_hartid_having_scratch = SBI_HARTMASK_MAX_BITS;
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struct sbi_scratch *hartid_to_scratch_table[SBI_HARTMASK_MAX_BITS] = { 0 };
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static spinlock_t extra_lock = SPIN_LOCK_INITIALIZER;
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static unsigned long extra_offset = SBI_SCRATCH_EXTRA_SPACE_OFFSET;
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typedef struct sbi_scratch *(*hartid2scratch)(ulong hartid, ulong hartindex);
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int sbi_scratch_init(struct sbi_scratch *scratch)
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{
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u32 i;
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const struct sbi_platform *plat = sbi_platform_ptr(scratch);
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for (i = 0; i < SBI_HARTMASK_MAX_BITS; i++) {
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if (sbi_platform_hart_invalid(plat, i))
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continue;
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hartid_to_scratch_table[i] =
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((hartid2scratch)scratch->hartid_to_scratch)(i,
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sbi_platform_hart_index(plat, i));
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if (hartid_to_scratch_table[i])
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last_hartid_having_scratch = i;
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}
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return 0;
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}
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unsigned long sbi_scratch_alloc_offset(unsigned long size, const char *owner)
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{
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u32 i;
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void *ptr;
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unsigned long ret = 0;
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struct sbi_scratch *rscratch;
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/*
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* We have a simple brain-dead allocator which never expects
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* anything to be free-ed hence it keeps incrementing the
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* next allocation offset until it runs-out of space.
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*
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* In future, we will have more sophisticated allocator which
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* will allow us to re-claim free-ed space.
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*/
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if (!size)
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return 0;
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if (size & (__SIZEOF_POINTER__ - 1))
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size = (size & ~(__SIZEOF_POINTER__ - 1)) + __SIZEOF_POINTER__;
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spin_lock(&extra_lock);
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if (SBI_SCRATCH_SIZE < (extra_offset + size))
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goto done;
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ret = extra_offset;
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extra_offset += size;
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done:
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spin_unlock(&extra_lock);
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if (ret) {
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for (i = 0; i < sbi_scratch_last_hartid(); i++) {
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rscratch = sbi_hartid_to_scratch(i);
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if (!rscratch)
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continue;
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ptr = sbi_scratch_offset_ptr(rscratch, ret);
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sbi_memset(ptr, 0, size);
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}
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}
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return ret;
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}
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void sbi_scratch_free_offset(unsigned long offset)
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{
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if ((offset < SBI_SCRATCH_EXTRA_SPACE_OFFSET) ||
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(SBI_SCRATCH_SIZE <= offset))
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return;
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/*
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* We don't actually free-up because it's a simple
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* brain-dead allocator.
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*/
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}
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