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