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      1 /*	$NetBSD: intel_gvt.c,v 1.2 2021/12/18 23:45:28 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the next
     14  * paragraph) shall be included in all copies or substantial portions of the
     15  * Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     23  * SOFTWARE.
     24  */
     25 
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: intel_gvt.c,v 1.2 2021/12/18 23:45:28 riastradh Exp $");
     28 
     29 #include "i915_drv.h"
     30 #include "intel_gvt.h"
     31 
     32 /**
     33  * DOC: Intel GVT-g host support
     34  *
     35  * Intel GVT-g is a graphics virtualization technology which shares the
     36  * GPU among multiple virtual machines on a time-sharing basis. Each
     37  * virtual machine is presented a virtual GPU (vGPU), which has equivalent
     38  * features as the underlying physical GPU (pGPU), so i915 driver can run
     39  * seamlessly in a virtual machine.
     40  *
     41  * To virtualize GPU resources GVT-g driver depends on hypervisor technology
     42  * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
     43  * and be virtualized within GVT-g device module. More architectural design
     44  * doc is available on https://01.org/group/2230/documentation-list.
     45  */
     46 
     47 static bool is_supported_device(struct drm_i915_private *dev_priv)
     48 {
     49 	if (IS_BROADWELL(dev_priv))
     50 		return true;
     51 	if (IS_SKYLAKE(dev_priv))
     52 		return true;
     53 	if (IS_KABYLAKE(dev_priv))
     54 		return true;
     55 	if (IS_BROXTON(dev_priv))
     56 		return true;
     57 	if (IS_COFFEELAKE(dev_priv))
     58 		return true;
     59 
     60 	return false;
     61 }
     62 
     63 /**
     64  * intel_gvt_sanitize_options - sanitize GVT related options
     65  * @dev_priv: drm i915 private data
     66  *
     67  * This function is called at the i915 options sanitize stage.
     68  */
     69 void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
     70 {
     71 	if (!i915_modparams.enable_gvt)
     72 		return;
     73 
     74 	if (intel_vgpu_active(dev_priv)) {
     75 		DRM_INFO("GVT-g is disabled for guest\n");
     76 		goto bail;
     77 	}
     78 
     79 	if (!is_supported_device(dev_priv)) {
     80 		DRM_INFO("Unsupported device. GVT-g is disabled\n");
     81 		goto bail;
     82 	}
     83 
     84 	return;
     85 bail:
     86 	i915_modparams.enable_gvt = 0;
     87 }
     88 
     89 /**
     90  * intel_gvt_init - initialize GVT components
     91  * @dev_priv: drm i915 private data
     92  *
     93  * This function is called at the initialization stage to create a GVT device.
     94  *
     95  * Returns:
     96  * Zero on success, negative error code if failed.
     97  *
     98  */
     99 int intel_gvt_init(struct drm_i915_private *dev_priv)
    100 {
    101 	int ret;
    102 
    103 	if (i915_inject_probe_failure(dev_priv))
    104 		return -ENODEV;
    105 
    106 	if (!i915_modparams.enable_gvt) {
    107 		DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n");
    108 		return 0;
    109 	}
    110 
    111 	if (USES_GUC_SUBMISSION(dev_priv)) {
    112 		DRM_ERROR("i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n");
    113 		return -EIO;
    114 	}
    115 
    116 	ret = intel_gvt_init_device(dev_priv);
    117 	if (ret) {
    118 		DRM_DEBUG_DRIVER("Fail to init GVT device\n");
    119 		goto bail;
    120 	}
    121 
    122 	return 0;
    123 
    124 bail:
    125 	i915_modparams.enable_gvt = 0;
    126 	return 0;
    127 }
    128 
    129 /**
    130  * intel_gvt_driver_remove - cleanup GVT components when i915 driver is
    131  *			     unbinding
    132  * @dev_priv: drm i915 private *
    133  *
    134  * This function is called at the i915 driver unloading stage, to shutdown
    135  * GVT components and release the related resources.
    136  */
    137 void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
    138 {
    139 	if (!intel_gvt_active(dev_priv))
    140 		return;
    141 
    142 	intel_gvt_clean_device(dev_priv);
    143 }
    144