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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radeon_semaphore.c (3244B)

      1/*
      2 * Copyright 2011 Christian König.
      3 * All Rights Reserved.
      4 *
      5 * Permission is hereby granted, free of charge, to any person obtaining a
      6 * copy of this software and associated documentation files (the
      7 * "Software"), to deal in the Software without restriction, including
      8 * without limitation the rights to use, copy, modify, merge, publish,
      9 * distribute, sub license, and/or sell copies of the Software, and to
     10 * permit persons to whom the Software is furnished to do so, subject to
     11 * the following conditions:
     12 *
     13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     15 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     16 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     17 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     18 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     19 * USE OR OTHER DEALINGS IN THE SOFTWARE.
     20 *
     21 * The above copyright notice and this permission notice (including the
     22 * next paragraph) shall be included in all copies or substantial portions
     23 * of the Software.
     24 *
     25 */
     26/*
     27 * Authors:
     28 *    Christian König <deathsimple@vodafone.de>
     29 */
     30
     31#include "radeon.h"
     32#include "radeon_trace.h"
     33
     34int radeon_semaphore_create(struct radeon_device *rdev,
     35			    struct radeon_semaphore **semaphore)
     36{
     37	int r;
     38
     39	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
     40	if (*semaphore == NULL) {
     41		return -ENOMEM;
     42	}
     43	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
     44			     &(*semaphore)->sa_bo, 8, 8);
     45	if (r) {
     46		kfree(*semaphore);
     47		*semaphore = NULL;
     48		return r;
     49	}
     50	(*semaphore)->waiters = 0;
     51	(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
     52
     53	*((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
     54
     55	return 0;
     56}
     57
     58bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
     59				  struct radeon_semaphore *semaphore)
     60{
     61	struct radeon_ring *ring = &rdev->ring[ridx];
     62
     63	trace_radeon_semaphore_signale(ridx, semaphore);
     64
     65	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
     66		--semaphore->waiters;
     67
     68		/* for debugging lockup only, used by sysfs debug files */
     69		ring->last_semaphore_signal_addr = semaphore->gpu_addr;
     70		return true;
     71	}
     72	return false;
     73}
     74
     75bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
     76				struct radeon_semaphore *semaphore)
     77{
     78	struct radeon_ring *ring = &rdev->ring[ridx];
     79
     80	trace_radeon_semaphore_wait(ridx, semaphore);
     81
     82	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
     83		++semaphore->waiters;
     84
     85		/* for debugging lockup only, used by sysfs debug files */
     86		ring->last_semaphore_wait_addr = semaphore->gpu_addr;
     87		return true;
     88	}
     89	return false;
     90}
     91
     92void radeon_semaphore_free(struct radeon_device *rdev,
     93			   struct radeon_semaphore **semaphore,
     94			   struct radeon_fence *fence)
     95{
     96	if (semaphore == NULL || *semaphore == NULL) {
     97		return;
     98	}
     99	if ((*semaphore)->waiters > 0) {
    100		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
    101			" hardware lockup imminent!\n", *semaphore);
    102	}
    103	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
    104	kfree(*semaphore);
    105	*semaphore = NULL;
    106}