mirror of
https://github.com/riscv-software-src/opensbi
synced 2025-11-05 06:20:21 +00:00
ce4dc7649e
Add the helpers to build up the cache hierarchy via FDT and provide some cmo functions for the user who want to flush the entire cache. Signed-off-by: Nick Hu <nick.hu@sifive.com> Reviewed-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20251020-cache-upstream-v7-4-69a132447d8a@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>
115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2025 SiFive Inc.
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*/
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#include <libfdt.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_scratch.h>
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#include <sbi_utils/cache/fdt_cache.h>
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#include <sbi_utils/cache/fdt_cmo_helper.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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static unsigned long flc_offset;
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#define get_hart_flc(_s) \
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sbi_scratch_read_type(_s, struct cache_device *, flc_offset)
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#define set_hart_flc(_s, _p) \
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sbi_scratch_write_type(_s, struct cache_device *, flc_offset, _p)
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int fdt_cmo_private_flc_flush_all(void)
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{
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struct cache_device *flc = get_hart_flc(sbi_scratch_thishart_ptr());
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if (!flc || !flc->cpu_private)
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return SBI_ENODEV;
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return cache_flush_all(flc);
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}
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int fdt_cmo_llc_flush_all(void)
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{
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struct cache_device *llc = get_hart_flc(sbi_scratch_thishart_ptr());
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if (!llc)
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return SBI_ENODEV;
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while (llc->next)
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llc = llc->next;
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return cache_flush_all(llc);
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}
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static int fdt_cmo_cold_init(const void *fdt)
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{
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struct sbi_scratch *scratch;
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struct cache_device *dev;
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int cpu_offset, cpus_offset, rc;
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u32 hartid;
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cpus_offset = fdt_path_offset(fdt, "/cpus");
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if (cpus_offset < 0)
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return SBI_EINVAL;
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fdt_for_each_subnode(cpu_offset, fdt, cpus_offset) {
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rc = fdt_parse_hart_id(fdt, cpu_offset, &hartid);
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if (rc)
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continue;
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scratch = sbi_hartid_to_scratch(hartid);
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if (!scratch)
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continue;
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rc = fdt_next_cache_get(fdt, cpu_offset, &dev);
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if (rc && rc != SBI_ENOENT)
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return rc;
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if (rc == SBI_ENOENT)
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dev = NULL;
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set_hart_flc(scratch, dev);
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}
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return SBI_OK;
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}
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static int fdt_cmo_warm_init(void)
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{
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struct cache_device *cur = get_hart_flc(sbi_scratch_thishart_ptr());
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int rc;
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while (cur) {
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if (cur->ops && cur->ops->warm_init) {
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rc = cur->ops->warm_init(cur);
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if (rc)
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return rc;
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}
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cur = cur->next;
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}
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return SBI_OK;
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}
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int fdt_cmo_init(bool cold_boot)
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{
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const void *fdt = fdt_get_address();
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int rc;
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if (cold_boot) {
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flc_offset = sbi_scratch_alloc_type_offset(struct cache_device *);
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if (!flc_offset)
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return SBI_ENOMEM;
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rc = fdt_cmo_cold_init(fdt);
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if (rc)
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return rc;
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}
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rc = fdt_cmo_warm_init();
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if (rc)
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return rc;
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return SBI_OK;
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}
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