cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sparx5_pgid.c (999B)

      1// SPDX-License-Identifier: GPL-2.0+
      2#include "sparx5_main.h"
      3
      4void sparx5_pgid_init(struct sparx5 *spx5)
      5{
      6	int i;
      7
      8	for (i = 0; i < PGID_TABLE_SIZE; i++)
      9		spx5->pgid_map[i] = SPX5_PGID_FREE;
     10
     11	/* Reserved for unicast, flood control, broadcast, and CPU.
     12	 * These cannot be freed.
     13	 */
     14	for (i = 0; i <= PGID_CPU; i++)
     15		spx5->pgid_map[i] = SPX5_PGID_RESERVED;
     16}
     17
     18int sparx5_pgid_alloc_mcast(struct sparx5 *spx5, u16 *idx)
     19{
     20	int i;
     21
     22	/* The multicast area starts at index 65, but the first 7
     23	 * are reserved for flood masks and CPU. Start alloc after that.
     24	 */
     25	for (i = PGID_MCAST_START; i < PGID_TABLE_SIZE; i++) {
     26		if (spx5->pgid_map[i] == SPX5_PGID_FREE) {
     27			spx5->pgid_map[i] = SPX5_PGID_MULTICAST;
     28			*idx = i;
     29			return 0;
     30		}
     31	}
     32
     33	return -EBUSY;
     34}
     35
     36int sparx5_pgid_free(struct sparx5 *spx5, u16 idx)
     37{
     38	if (idx <= PGID_CPU || idx >= PGID_TABLE_SIZE)
     39		return -EINVAL;
     40
     41	if (spx5->pgid_map[idx] == SPX5_PGID_FREE)
     42		return -EINVAL;
     43
     44	spx5->pgid_map[idx] = SPX5_PGID_FREE;
     45	return 0;
     46}