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      1 /*	$NetBSD: vbox_ttm.c,v 1.2 2021/12/18 23:45:44 riastradh Exp $	*/
      2 
      3 // SPDX-License-Identifier: MIT
      4 /*
      5  * Copyright (C) 2013-2017 Oracle Corporation
      6  * This file is based on ast_ttm.c
      7  * Copyright 2012 Red Hat Inc.
      8  * Authors: Dave Airlie <airlied (at) redhat.com>
      9  *          Michael Thayer <michael.thayer (at) oracle.com>
     10  */
     11 #include <sys/cdefs.h>
     12 __KERNEL_RCSID(0, "$NetBSD: vbox_ttm.c,v 1.2 2021/12/18 23:45:44 riastradh Exp $");
     13 
     14 #include <linux/pci.h>
     15 #include <drm/drm_file.h>
     16 #include "vbox_drv.h"
     17 
     18 int vbox_mm_init(struct vbox_private *vbox)
     19 {
     20 	struct drm_vram_mm *vmm;
     21 	int ret;
     22 	struct drm_device *dev = &vbox->ddev;
     23 
     24 	vmm = drm_vram_helper_alloc_mm(dev, pci_resource_start(dev->pdev, 0),
     25 				       vbox->available_vram_size);
     26 	if (IS_ERR(vmm)) {
     27 		ret = PTR_ERR(vmm);
     28 		DRM_ERROR("Error initializing VRAM MM; %d\n", ret);
     29 		return ret;
     30 	}
     31 
     32 #ifdef DRM_MTRR_WC
     33 	vbox->fb_mtrr = drm_mtrr_add(pci_resource_start(dev->pdev, 0),
     34 				     pci_resource_len(dev->pdev, 0),
     35 				     DRM_MTRR_WC);
     36 #else
     37 	vbox->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
     38 					 pci_resource_len(dev->pdev, 0));
     39 #endif
     40 	return 0;
     41 }
     42 
     43 void vbox_mm_fini(struct vbox_private *vbox)
     44 {
     45 #ifdef DRM_MTRR_WC
     46 	drm_mtrr_del(vbox->fb_mtrr,
     47 		     pci_resource_start(vbox->ddev.pdev, 0),
     48 		     pci_resource_len(vbox->ddev.pdev, 0), DRM_MTRR_WC);
     49 #else
     50 	arch_phys_wc_del(vbox->fb_mtrr);
     51 #endif
     52 	drm_vram_helper_release_mm(&vbox->ddev);
     53 }
     54