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      1 /*	$NetBSD: vmwgfx_ttm_glue.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $	*/
      2 
      3 // SPDX-License-Identifier: GPL-2.0 OR MIT
      4 /**************************************************************************
      5  *
      6  * Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA
      7  *
      8  * Permission is hereby granted, free of charge, to any person obtaining a
      9  * copy of this software and associated documentation files (the
     10  * "Software"), to deal in the Software without restriction, including
     11  * without limitation the rights to use, copy, modify, merge, publish,
     12  * distribute, sub license, and/or sell copies of the Software, and to
     13  * permit persons to whom the Software is furnished to do so, subject to
     14  * the following conditions:
     15  *
     16  * The above copyright notice and this permission notice (including the
     17  * next paragraph) shall be included in all copies or substantial portions
     18  * of the Software.
     19  *
     20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     22  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     23  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     24  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     25  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     26  * USE OR OTHER DEALINGS IN THE SOFTWARE.
     27  *
     28  **************************************************************************/
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: vmwgfx_ttm_glue.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $");
     32 
     33 #include "vmwgfx_drv.h"
     34 
     35 int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
     36 {
     37 	static const struct vm_operations_struct vmw_vm_ops = {
     38 		.pfn_mkwrite = vmw_bo_vm_mkwrite,
     39 		.page_mkwrite = vmw_bo_vm_mkwrite,
     40 		.fault = vmw_bo_vm_fault,
     41 		.open = ttm_bo_vm_open,
     42 		.close = ttm_bo_vm_close
     43 	};
     44 	struct drm_file *file_priv = filp->private_data;
     45 	struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
     46 	int ret = ttm_bo_mmap(filp, vma, &dev_priv->bdev);
     47 
     48 	if (ret)
     49 		return ret;
     50 
     51 	vma->vm_ops = &vmw_vm_ops;
     52 
     53 	/* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
     54 	if ((vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) != VM_MAYWRITE)
     55 		vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
     56 
     57 	return 0;
     58 }
     59 
     60 /* struct vmw_validation_mem callback */
     61 static int vmw_vmt_reserve(struct vmw_validation_mem *m, size_t size)
     62 {
     63 	static struct ttm_operation_ctx ctx = {.interruptible = false,
     64 					       .no_wait_gpu = false};
     65 	struct vmw_private *dev_priv = container_of(m, struct vmw_private, vvm);
     66 
     67 	return ttm_mem_global_alloc(vmw_mem_glob(dev_priv), size, &ctx);
     68 }
     69 
     70 /* struct vmw_validation_mem callback */
     71 static void vmw_vmt_unreserve(struct vmw_validation_mem *m, size_t size)
     72 {
     73 	struct vmw_private *dev_priv = container_of(m, struct vmw_private, vvm);
     74 
     75 	return ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
     76 }
     77 
     78 /**
     79  * vmw_validation_mem_init_ttm - Interface the validation memory tracker
     80  * to ttm.
     81  * @dev_priv: Pointer to struct vmw_private. The reason we choose a vmw private
     82  * rather than a struct vmw_validation_mem is to make sure assumption in the
     83  * callbacks that struct vmw_private derives from struct vmw_validation_mem
     84  * holds true.
     85  * @gran: The recommended allocation granularity
     86  */
     87 void vmw_validation_mem_init_ttm(struct vmw_private *dev_priv, size_t gran)
     88 {
     89 	struct vmw_validation_mem *vvm = &dev_priv->vvm;
     90 
     91 	vvm->reserve_mem = vmw_vmt_reserve;
     92 	vvm->unreserve_mem = vmw_vmt_unreserve;
     93 	vvm->gran = gran;
     94 }
     95