[linux-2.6-block.git] / drivers / gpu / drm / i915 / intel_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 "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 (!is_supported_device(dev_priv)) {
		DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\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);
}
Commit	Line	Data
0ad35fed ZW	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
22681c7b ZW	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.
0ad35fed ZW	40	*/
	41
	42	static bool is_supported_device(struct drm_i915_private *dev_priv)
	43	{
	44	if (IS_BROADWELL(dev_priv))
	45	return true;
21196a81 ZW	46	if (IS_SKYLAKE(dev_priv))
21196a81 ZW	47	return true;
0ad35fed ZW	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");
7822492f	72	goto bail;
0ad35fed ZW	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");
7822492f	81	goto bail;
0ad35fed ZW	82	}
	83
	84	ret = intel_gvt_init_device(dev_priv);
	85	if (ret) {
	86	DRM_DEBUG_DRIVER("Fail to init GVT device\n");
7822492f	87	goto bail;
0ad35fed ZW	88	}
	89
	90	return 0;
7822492f CW	91
	92	bail:
	93	i915.enable_gvt = 0;
	94	return 0;
0ad35fed ZW	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	}