Release 4.8 drivers/gpu/drm/i915/gvt/gvt.c
/*
* 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 <linux/types.h>
#include <xen/xen.h>
#include "i915_drv.h"
struct intel_gvt_host intel_gvt_host;
static const char * const supported_hypervisors[] = {
[INTEL_GVT_HYPERVISOR_XEN] = "XEN",
[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
};
/**
* intel_gvt_init_host - Load MPT modules and detect if we're running in host
* @gvt: intel gvt device
*
* This function is called at the driver loading stage. If failed to find a
* loadable MPT module or detect currently we're running in a VM, then GVT-g
* will be disabled
*
* Returns:
* Zero on success, negative error code if failed.
*
*/
int intel_gvt_init_host(void)
{
if (intel_gvt_host.initialized)
return 0;
/* Xen DOM U */
if (xen_domain() && !xen_initial_domain())
return -ENODEV;
/* Try to load MPT modules for hypervisors */
if (xen_initial_domain()) {
/* In Xen dom0 */
intel_gvt_host.mpt = try_then_request_module(
symbol_get(xengt_mpt), "xengt");
intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
} else {
/* not in Xen. Try KVMGT */
intel_gvt_host.mpt = try_then_request_module(
symbol_get(kvmgt_mpt), "kvm");
intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
}
/* Fail to load MPT modules - bail out */
if (!intel_gvt_host.mpt)
return -EINVAL;
/* Try to detect if we're running in host instead of VM. */
if (!intel_gvt_hypervisor_detect_host())
return -ENODEV;
gvt_dbg_core("Running with hypervisor %s in host mode\n",
supported_hypervisors[intel_gvt_host.hypervisor_type]);
intel_gvt_host.initialized = true;
return 0;
}
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static void init_device_info(struct intel_gvt *gvt)
{
if (IS_BROADWELL(gvt->dev_priv))
gvt->device_info.max_support_vgpus = 8;
/* This function will grow large in GVT device model patches. */
}
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/**
* intel_gvt_clean_device - clean a GVT device
* @gvt: intel gvt device
*
* This function is called at the driver unloading stage, to free the
* resources owned by a GVT device.
*
*/
void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
{
struct intel_gvt *gvt = &dev_priv->gvt;
if (WARN_ON(!gvt->initialized))
return;
/* Other de-initialization of GVT components will be introduced. */
gvt->initialized = false;
}
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/**
* intel_gvt_init_device - initialize a GVT device
* @dev_priv: drm i915 private data
*
* This function is called at the initialization stage, to initialize
* necessary GVT components.
*
* Returns:
* Zero on success, negative error code if failed.
*
*/
int intel_gvt_init_device(struct drm_i915_private *dev_priv)
{
struct intel_gvt *gvt = &dev_priv->gvt;
/*
* Cannot initialize GVT device without intel_gvt_host gets
* initialized first.
*/
if (WARN_ON(!intel_gvt_host.initialized))
return -EINVAL;
if (WARN_ON(gvt->initialized))
return -EEXIST;
gvt_dbg_core("init gvt device\n");
init_device_info(gvt);
/*
* Other initialization of GVT components will be introduce here.
*/
gvt_dbg_core("gvt device creation is done\n");
gvt->initialized = true;
return 0;
}
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