93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
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/*
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* Copyright (c) 2020 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <vppinfra/clib.h>
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#include <vppinfra/bitops.h> /* for count_set_bits */
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#include <vppinfra/vec.h>
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#include <vppinfra/interrupt.h>
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#include <vppinfra/format.h>
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__clib_export void
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clib_interrupt_init (void **data, uword n_int)
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{
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clib_interrupt_header_t *h;
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uword sz = sizeof (clib_interrupt_header_t);
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uword data_size = round_pow2 (n_int, CLIB_CACHE_LINE_BYTES * 8) / 8;
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sz += 2 * data_size;
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h = data[0] = clib_mem_alloc_aligned (sz, CLIB_CACHE_LINE_BYTES);
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clib_memset (data[0], 0, sz);
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h->n_int = n_int;
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h->n_uword_alloc = (data_size * 8) >> log2_uword_bits;
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}
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__clib_export void
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clib_interrupt_resize (void **data, uword n_int)
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{
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clib_interrupt_header_t *h = data[0];
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if (data[0] == 0)
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{
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clib_interrupt_init (data, n_int);
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return;
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}
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if (n_int < h->n_int)
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{
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uword *old_bmp, *old_abp, v;
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old_bmp = clib_interrupt_get_bitmap (data[0]);
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old_abp = clib_interrupt_get_atomic_bitmap (data[0]);
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for (uword i = 0; i < h->n_uword_alloc; i++)
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{
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v = old_abp[i];
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old_abp[i] = 0;
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if (n_int > ((i + 1) * uword_bits))
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old_bmp[i] |= v;
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else if (n_int > (i * uword_bits))
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old_bmp[i] = (old_bmp[i] | v) & pow2_mask (n_int - i * uword_bits);
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else
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old_bmp[i] = 0;
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}
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}
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else if (n_int > h->n_uword_alloc * uword_bits)
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{
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void *old = data[0];
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uword *old_bmp, *old_abp, *new_bmp;
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uword n_uwords = round_pow2 (h->n_int, uword_bits) / uword_bits;
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clib_interrupt_init (data, n_int);
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h = data[0];
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new_bmp = clib_interrupt_get_bitmap (data[0]);
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old_bmp = clib_interrupt_get_bitmap (old);
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old_abp = clib_interrupt_get_atomic_bitmap (old);
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for (uword i = 0; i < n_uwords; i++)
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new_bmp[i] = old_bmp[i] | old_abp[i];
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clib_mem_free (old);
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}
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h->n_int = n_int;
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}
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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