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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kfd_pasid.c (1943B)

      1// SPDX-License-Identifier: GPL-2.0 OR MIT
      2/*
      3 * Copyright 2014-2022 Advanced Micro Devices, Inc.
      4 *
      5 * Permission is hereby granted, free of charge, to any person obtaining a
      6 * copy of this software and associated documentation files (the "Software"),
      7 * to deal in the Software without restriction, including without limitation
      8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      9 * and/or sell copies of the Software, and to permit persons to whom the
     10 * Software is furnished to do so, subject to the following conditions:
     11 *
     12 * The above copyright notice and this permission notice shall be included in
     13 * all copies or substantial portions of the Software.
     14 *
     15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     21 * OTHER DEALINGS IN THE SOFTWARE.
     22 */
     23
     24#include <linux/types.h>
     25#include "kfd_priv.h"
     26#include "amdgpu_ids.h"
     27
     28static unsigned int pasid_bits = 16;
     29static bool pasids_allocated; /* = false */
     30
     31bool kfd_set_pasid_limit(unsigned int new_limit)
     32{
     33	if (new_limit < 2)
     34		return false;
     35
     36	if (new_limit < (1U << pasid_bits)) {
     37		if (pasids_allocated)
     38			/* We've already allocated user PASIDs, too late to
     39			 * change the limit
     40			 */
     41			return false;
     42
     43		while (new_limit < (1U << pasid_bits))
     44			pasid_bits--;
     45	}
     46
     47	return true;
     48}
     49
     50unsigned int kfd_get_pasid_limit(void)
     51{
     52	return 1U << pasid_bits;
     53}
     54
     55u32 kfd_pasid_alloc(void)
     56{
     57	int r = amdgpu_pasid_alloc(pasid_bits);
     58
     59	if (r > 0) {
     60		pasids_allocated = true;
     61		return r;
     62	}
     63
     64	return 0;
     65}
     66
     67void kfd_pasid_free(u32 pasid)
     68{
     69	amdgpu_pasid_free(pasid);
     70}