LXR linux/drivers/gpu/drm/i915/intel

   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
  42static 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        if (IS_KABYLAKE(dev_priv))
  49                return true;
  50        if (IS_BROXTON(dev_priv))
  51                return true;
  52        if (IS_COFFEELAKE(dev_priv))
  53                return true;
  54
  55        return false;
  56}
  57
  58/**
  59 * intel_gvt_sanitize_options - sanitize GVT related options
  60 * @dev_priv: drm i915 private data
  61 *
  62 * This function is called at the i915 options sanitize stage.
  63 */
  64void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
  65{
  66        if (!i915_modparams.enable_gvt)
  67                return;
  68
  69        if (intel_vgpu_active(dev_priv)) {
  70                DRM_INFO("GVT-g is disabled for guest\n");
  71                goto bail;
  72        }
  73
  74        if (!is_supported_device(dev_priv)) {
  75                DRM_INFO("Unsupported device. GVT-g is disabled\n");
  76                goto bail;
  77        }
  78
  79        return;
  80bail:
  81        i915_modparams.enable_gvt = 0;
  82}
  83
  84/**
  85 * intel_gvt_init - initialize GVT components
  86 * @dev_priv: drm i915 private data
  87 *
  88 * This function is called at the initialization stage to create a GVT device.
  89 *
  90 * Returns:
  91 * Zero on success, negative error code if failed.
  92 *
  93 */
  94int intel_gvt_init(struct drm_i915_private *dev_priv)
  95{
  96        int ret;
  97
  98        if (i915_inject_load_failure())
  99                return -ENODEV;
 100
 101        if (!i915_modparams.enable_gvt) {
 102                DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n");
 103                return 0;
 104        }
 105
 106        if (USES_GUC_SUBMISSION(dev_priv)) {
 107                DRM_ERROR("i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n");
 108                return -EIO;
 109        }
 110
 111        ret = intel_gvt_init_device(dev_priv);
 112        if (ret) {
 113                DRM_DEBUG_DRIVER("Fail to init GVT device\n");
 114                goto bail;
 115        }
 116
 117        return 0;
 118
 119bail:
 120        i915_modparams.enable_gvt = 0;
 121        return 0;
 122}
 123
 124/**
 125 * intel_gvt_cleanup - cleanup GVT components when i915 driver is unloading
 126 * @dev_priv: drm i915 private *
 127 *
 128 * This function is called at the i915 driver unloading stage, to shutdown
 129 * GVT components and release the related resources.
 130 */
 131void intel_gvt_cleanup(struct drm_i915_private *dev_priv)
 132{
 133        if (!intel_gvt_active(dev_priv))
 134                return;
 135
 136        intel_gvt_clean_device(dev_priv);
 137}
 138