146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
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* Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/types.h>
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#include <xen/xen.h>
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#include "i915_drv.h"
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struct intel_gvt_host intel_gvt_host;
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static const char * const supported_hypervisors[] = {
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[INTEL_GVT_HYPERVISOR_XEN] = "XEN",
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[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
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};
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/**
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* intel_gvt_init_host - Load MPT modules and detect if we're running in host
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* @gvt: intel gvt device
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*
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* This function is called at the driver loading stage. If failed to find a
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* loadable MPT module or detect currently we're running in a VM, then GVT-g
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* will be disabled
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*
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*/
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int intel_gvt_init_host(void)
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{
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if (intel_gvt_host.initialized)
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return 0;
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/* Xen DOM U */
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if (xen_domain() && !xen_initial_domain())
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return -ENODEV;
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/* Try to load MPT modules for hypervisors */
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if (xen_initial_domain()) {
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/* In Xen dom0 */
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intel_gvt_host.mpt = try_then_request_module(
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symbol_get(xengt_mpt), "xengt");
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intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
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} else {
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/* not in Xen. Try KVMGT */
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intel_gvt_host.mpt = try_then_request_module(
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symbol_get(kvmgt_mpt), "kvm");
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intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
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}
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/* Fail to load MPT modules - bail out */
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if (!intel_gvt_host.mpt)
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return -EINVAL;
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/* Try to detect if we're running in host instead of VM. */
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if (!intel_gvt_hypervisor_detect_host())
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return -ENODEV;
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gvt_dbg_core("Running with hypervisor %s in host mode\n",
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supported_hypervisors[intel_gvt_host.hypervisor_type]);
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intel_gvt_host.initialized = true;
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return 0;
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}
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static void init_device_info(struct intel_gvt *gvt)
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{
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if (IS_BROADWELL(gvt->dev_priv))
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gvt->device_info.max_support_vgpus = 8;
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/* This function will grow large in GVT device model patches. */
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}
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/**
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* intel_gvt_clean_device - clean a GVT device
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* @gvt: intel gvt device
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*
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* This function is called at the driver unloading stage, to free the
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* resources owned by a GVT device.
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*
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*/
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void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
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{
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struct intel_gvt *gvt = &dev_priv->gvt;
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if (WARN_ON(!gvt->initialized))
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return;
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/* Other de-initialization of GVT components will be introduced. */
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gvt->initialized = false;
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}
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/**
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* intel_gvt_init_device - initialize a GVT device
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* @dev_priv: drm i915 private data
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*
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* This function is called at the initialization stage, to initialize
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* necessary GVT components.
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*
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*/
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int intel_gvt_init_device(struct drm_i915_private *dev_priv)
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{
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struct intel_gvt *gvt = &dev_priv->gvt;
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/*
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* Cannot initialize GVT device without intel_gvt_host gets
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* initialized first.
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*/
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if (WARN_ON(!intel_gvt_host.initialized))
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return -EINVAL;
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if (WARN_ON(gvt->initialized))
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return -EEXIST;
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gvt_dbg_core("init gvt device\n");
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init_device_info(gvt);
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/*
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* Other initialization of GVT components will be introduce here.
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*/
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gvt_dbg_core("gvt device creation is done\n");
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gvt->initialized = true;
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return 0;
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}
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