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/*
* Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "i915_drv.h"
#include "intel_gvt.h"
/**
* DOC: Intel GVT-g host support
*
* Intel GVT-g is a graphics virtualization technology which shares the
* GPU among multiple virtual machines on a time-sharing basis. Each
* virtual machine is presented a virtual GPU (vGPU), which has equivalent
* features as the underlying physical GPU (pGPU), so i915 driver can run
* seamlessly in a virtual machine.
*
* To virtualize GPU resources GVT-g driver depends on hypervisor technology
* e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
* and be virtualized within GVT-g device module. More architectural design
* doc is available on https://01.org/group/2230/documentation-list.
*/
static bool is_supported_device(struct drm_i915_private *dev_priv)
{
if (IS_BROADWELL(dev_priv))
return true;
if (IS_SKYLAKE(dev_priv))
return true;
return false;
}
/**
* intel_gvt_init - initialize GVT components
* @dev_priv: drm i915 private data
*
* This function is called at the initialization stage to create a GVT device.
*
* Returns:
* Zero on success, negative error code if failed.
*
*/
int intel_gvt_init(struct drm_i915_private *dev_priv)
{
int ret;
if (!i915.enable_gvt) {
DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n");
return 0;
}
if (intel_vgpu_active(dev_priv)) {
DRM_DEBUG_DRIVER("GVT-g is disabled for guest\n");
goto bail;
}
if (!is_supported_device(dev_priv)) {
DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\n");
goto bail;
}
if (!i915.enable_execlists) {
DRM_INFO("GPU guest virtualisation [GVT-g] disabled due to disabled execlist submission [i915.enable_execlists module parameter]\n");
goto bail;
}
/*
* We're not in host or fail to find a MPT module, disable GVT-g
*/
ret = intel_gvt_init_host();
if (ret) {
DRM_DEBUG_DRIVER("Not in host or MPT modules not found\n");
goto bail;
}
ret = intel_gvt_init_device(dev_priv);
if (ret) {
DRM_DEBUG_DRIVER("Fail to init GVT device\n");
goto bail;
}
return 0;
bail:
i915.enable_gvt = 0;
return 0;
}
/**
* intel_gvt_cleanup - cleanup GVT components when i915 driver is unloading
* @dev_priv: drm i915 private *
*
* This function is called at the i915 driver unloading stage, to shutdown
* GVT components and release the related resources.
*/
void intel_gvt_cleanup(struct drm_i915_private *dev_priv)
{
if (!intel_gvt_active(dev_priv))
return;
intel_gvt_clean_device(dev_priv);
}
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