drivers/gpu/drm/i915/intel_gvt.c

   1 /*
   2  * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  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 NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #include "i915_drv.h"
  25 #include "intel_gvt.h"
  26
  27 /**
  28  * DOC: Intel GVT-g host support
  29  *
  30  * Intel GVT-g is a graphics virtualization technology which shares the
  31  * GPU among multiple virtual machines on a time-sharing basis. Each
  32  * virtual machine is presented a virtual GPU (vGPU), which has equivalent
  33  * features as the underlying physical GPU (pGPU), so i915 driver can run
  34  * seamlessly in a virtual machine.
  35  *
  36  * To virtualize GPU resources GVT-g driver depends on hypervisor technology
  37  * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
  38  * and be virtualized within GVT-g device module. More architectural design
  39  * doc is available on https://01.org/group/2230/documentation-list.
  40  */
  41
  42 static bool is_supported_device(struct drm_i915_private *dev_priv)
  43 {
  44         if (IS_BROADWELL(dev_priv))
  45                 return true;
  46         if (IS_SKYLAKE(dev_priv))
  47                 return true;
  48         return false;
  49 }
  50
  51 /**
  52  * intel_gvt_init - initialize GVT components
  53  * @dev_priv: drm i915 private data
  54  *
  55  * This function is called at the initialization stage to create a GVT device.
  56  *
  57  * Returns:
  58  * Zero on success, negative error code if failed.
  59  *
  60  */
  61 int intel_gvt_init(struct drm_i915_private *dev_priv)
  62 {
  63         int ret;
  64
  65         if (!i915.enable_gvt) {
  66                 DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n");
  67                 return 0;
  68         }
  69
  70         if (!is_supported_device(dev_priv)) {
  71                 DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\n");
  72                 goto bail;
  73         }
  74
  75         /*
  76          * We're not in host or fail to find a MPT module, disable GVT-g
  77          */
  78         ret = intel_gvt_init_host();
  79         if (ret) {
  80                 DRM_DEBUG_DRIVER("Not in host or MPT modules not found\n");
  81                 goto bail;
  82         }
  83
  84         ret = intel_gvt_init_device(dev_priv);
  85         if (ret) {
  86                 DRM_DEBUG_DRIVER("Fail to init GVT device\n");
  87                 goto bail;
  88         }
  89
  90         return 0;
  91
  92 bail:
  93         i915.enable_gvt = 0;
  94         return 0;
  95 }
  96
  97 /**
  98  * intel_gvt_cleanup - cleanup GVT components when i915 driver is unloading
  99  * @dev_priv: drm i915 private *
 100  *
 101  * This function is called at the i915 driver unloading stage, to shutdown
 102  * GVT components and release the related resources.
 103  */
 104 void intel_gvt_cleanup(struct drm_i915_private *dev_priv)
 105 {
 106         if (!intel_gvt_active(dev_priv))
 107                 return;
 108
 109         intel_gvt_clean_device(dev_priv);
 110 }