mirror of
https://github.com/riscv-software-src/opensbi
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d6b684ec86
Add the FDT cache library so we can build up the cache topology via the 'next-level-cache' DT property. Co-developed-by: Vincent Chen <vincent.chen@sifive.com> Signed-off-by: Vincent Chen <vincent.chen@sifive.com> Co-developed-by: Andy Chiu <andy.chiu@sifive.com> Signed-off-by: Andy Chiu <andy.chiu@sifive.com> 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-v7-2-69a132447d8a@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>
88 lines
1.7 KiB
C
88 lines
1.7 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_console.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_heap.h>
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#include <sbi_utils/cache/fdt_cache.h>
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#include <sbi_utils/fdt/fdt_driver.h>
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/* List of FDT cache drivers generated at compile time */
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extern const struct fdt_driver *const fdt_cache_drivers[];
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int fdt_cache_add(const void *fdt, int noff, struct cache_device *dev)
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{
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int rc;
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dev->id = noff;
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sbi_strncpy(dev->name, fdt_get_name(fdt, noff, NULL), sizeof(dev->name) - 1);
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sbi_dprintf("%s: %s\n", __func__, dev->name);
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rc = fdt_next_cache_get(fdt, noff, &dev->next);
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if (rc)
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return rc;
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return cache_add(dev);
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}
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static int fdt_cache_add_generic(const void *fdt, int noff)
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{
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struct cache_device *dev;
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int rc;
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dev = sbi_zalloc(sizeof(*dev));
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if (!dev)
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return SBI_ENOMEM;
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rc = fdt_cache_add(fdt, noff, dev);
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if (rc) {
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sbi_free(dev);
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return rc;
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}
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return 0;
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}
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static int fdt_cache_find(const void *fdt, int noff, struct cache_device **out_dev)
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{
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struct cache_device *dev = cache_find(noff);
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int rc;
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if (!dev) {
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rc = fdt_driver_init_by_offset(fdt, noff, fdt_cache_drivers);
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if (rc == SBI_ENODEV)
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rc = fdt_cache_add_generic(fdt, noff);
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if (rc)
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return rc;
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dev = cache_find(noff);
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if (!dev)
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return SBI_EFAIL;
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}
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if (out_dev)
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*out_dev = dev;
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return SBI_OK;
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}
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int fdt_next_cache_get(const void *fdt, int noff, struct cache_device **out_dev)
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{
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const fdt32_t *val;
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int len;
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val = fdt_getprop(fdt, noff, "next-level-cache", &len);
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if (!val || len < sizeof(*val))
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return SBI_ENOENT;
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noff = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(val[0]));
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if (noff < 0)
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return noff;
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return fdt_cache_find(fdt, noff, out_dev);
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}
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