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      1 /*	$NetBSD: radeon_semaphore.c,v 1.3 2021/12/18 23:45:43 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2011 Christian Knig.
      5  * All Rights Reserved.
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a
      8  * copy of this software and associated documentation files (the
      9  * "Software"), to deal in the Software without restriction, including
     10  * without limitation the rights to use, copy, modify, merge, publish,
     11  * distribute, sub license, and/or sell copies of the Software, and to
     12  * permit persons to whom the Software is furnished to do so, subject to
     13  * the following conditions:
     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 NON-INFRINGEMENT. IN NO EVENT SHALL
     18  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
     22  *
     23  * The above copyright notice and this permission notice (including the
     24  * next paragraph) shall be included in all copies or substantial portions
     25  * of the Software.
     26  *
     27  */
     28 /*
     29  * Authors:
     30  *    Christian Knig <deathsimple (at) vodafone.de>
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: radeon_semaphore.c,v 1.3 2021/12/18 23:45:43 riastradh Exp $");
     35 
     36 #include "radeon.h"
     37 #include "radeon_trace.h"
     38 
     39 int radeon_semaphore_create(struct radeon_device *rdev,
     40 			    struct radeon_semaphore **semaphore)
     41 {
     42 	int r;
     43 
     44 	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
     45 	if (*semaphore == NULL) {
     46 		return -ENOMEM;
     47 	}
     48 	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
     49 			     &(*semaphore)->sa_bo, 8, 8);
     50 	if (r) {
     51 		kfree(*semaphore);
     52 		*semaphore = NULL;
     53 		return r;
     54 	}
     55 	(*semaphore)->waiters = 0;
     56 	(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
     57 
     58 	*((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
     59 
     60 	return 0;
     61 }
     62 
     63 bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
     64 				  struct radeon_semaphore *semaphore)
     65 {
     66 	struct radeon_ring *ring = &rdev->ring[ridx];
     67 
     68 	trace_radeon_semaphore_signale(ridx, semaphore);
     69 
     70 	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
     71 		--semaphore->waiters;
     72 
     73 		/* for debugging lockup only, used by sysfs debug files */
     74 		ring->last_semaphore_signal_addr = semaphore->gpu_addr;
     75 		return true;
     76 	}
     77 	return false;
     78 }
     79 
     80 bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
     81 				struct radeon_semaphore *semaphore)
     82 {
     83 	struct radeon_ring *ring = &rdev->ring[ridx];
     84 
     85 	trace_radeon_semaphore_wait(ridx, semaphore);
     86 
     87 	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
     88 		++semaphore->waiters;
     89 
     90 		/* for debugging lockup only, used by sysfs debug files */
     91 		ring->last_semaphore_wait_addr = semaphore->gpu_addr;
     92 		return true;
     93 	}
     94 	return false;
     95 }
     96 
     97 void radeon_semaphore_free(struct radeon_device *rdev,
     98 			   struct radeon_semaphore **semaphore,
     99 			   struct radeon_fence *fence)
    100 {
    101 	if (semaphore == NULL || *semaphore == NULL) {
    102 		return;
    103 	}
    104 	if ((*semaphore)->waiters > 0) {
    105 		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
    106 			" hardware lockup imminent!\n", *semaphore);
    107 	}
    108 	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
    109 	kfree(*semaphore);
    110 	*semaphore = NULL;
    111 }
    112