[mirror_ubuntu-zesty-kernel.git] / drivers / gpu / drm / i915 / i915_vgpu.c

/*
 * Copyright(c) 2011-2015 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 "intel_drv.h"
#include "i915_vgpu.h"

/**
 * DOC: Intel GVT-g guest 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. This file provides vGPU specific
 * optimizations when running in a virtual machine, to reduce the complexity
 * of vGPU emulation and to improve the overall performance.
 *
 * A primary function introduced here is so-called "address space ballooning"
 * technique. Intel GVT-g partitions global graphics memory among multiple VMs,
 * so each VM can directly access a portion of the memory without hypervisor's
 * intervention, e.g. filling textures or queuing commands. However with the
 * partitioning an unmodified i915 driver would assume a smaller graphics
 * memory starting from address ZERO, then requires vGPU emulation module to
 * translate the graphics address between 'guest view' and 'host view', for
 * all registers and command opcodes which contain a graphics memory address.
 * To reduce the complexity, Intel GVT-g introduces "address space ballooning",
 * by telling the exact partitioning knowledge to each guest i915 driver, which
 * then reserves and prevents non-allocated portions from allocation. Thus vGPU
 * emulation module only needs to scan and validate graphics addresses without
 * complexity of address translation.
 *
 */

/**
 * i915_check_vgpu - detect virtual GPU
 * @dev_priv: i915 device private
 *
 * This function is called at the initialization stage, to detect whether
 * running on a vGPU.
 */
void i915_check_vgpu(struct drm_i915_private *dev_priv)
{
	uint64_t magic;
	uint32_t version;

	BUILD_BUG_ON(sizeof(struct vgt_if) != VGT_PVINFO_SIZE);

	magic = __raw_i915_read64(dev_priv, vgtif_reg(magic));
	if (magic != VGT_MAGIC)
		return;

	version = INTEL_VGT_IF_VERSION_ENCODE(
		__raw_i915_read16(dev_priv, vgtif_reg(version_major)),
		__raw_i915_read16(dev_priv, vgtif_reg(version_minor)));
	if (version != INTEL_VGT_IF_VERSION) {
		DRM_INFO("VGT interface version mismatch!\n");
		return;
	}

	dev_priv->vgpu.active = true;
	DRM_INFO("Virtual GPU for Intel GVT-g detected.\n");
}

struct _balloon_info_ {
	/*
	 * There are up to 2 regions per mappable/unmappable graphic
	 * memory that might be ballooned. Here, index 0/1 is for mappable
	 * graphic memory, 2/3 for unmappable graphic memory.
	 */
	struct drm_mm_node space[4];
};

static struct _balloon_info_ bl_info;

/**
 * intel_vgt_deballoon - deballoon reserved graphics address trunks
 *
 * This function is called to deallocate the ballooned-out graphic memory, when
 * driver is unloaded or when ballooning fails.
 */
void intel_vgt_deballoon(struct drm_i915_private *dev_priv)
{
	int i;

	if (!intel_vgpu_active(dev_priv))
		return;

	DRM_DEBUG("VGT deballoon.\n");

	for (i = 0; i < 4; i++) {
		if (bl_info.space[i].allocated)
			drm_mm_remove_node(&bl_info.space[i]);
	}

	memset(&bl_info, 0, sizeof(bl_info));
}

static int vgt_balloon_space(struct drm_mm *mm,
			     struct drm_mm_node *node,
			     unsigned long start, unsigned long end)
{
	unsigned long size = end - start;

	if (start == end)
		return -EINVAL;

	DRM_INFO("balloon space: range [ 0x%lx - 0x%lx ] %lu KiB.\n",
		 start, end, size / 1024);

	node->start = start;
	node->size = size;

	return drm_mm_reserve_node(mm, node);
}

/**
 * intel_vgt_balloon - balloon out reserved graphics address trunks
 * @dev: drm device
 *
 * This function is called at the initialization stage, to balloon out the
 * graphic address space allocated to other vGPUs, by marking these spaces as
 * reserved. The ballooning related knowledge(starting address and size of
 * the mappable/unmappable graphic memory) is described in the vgt_if structure
 * in a reserved mmio range.
 *
 * To give an example, the drawing below depicts one typical scenario after
 * ballooning. Here the vGPU1 has 2 pieces of graphic address spaces ballooned
 * out each for the mappable and the non-mappable part. From the vGPU1 point of
 * view, the total size is the same as the physical one, with the start address
 * of its graphic space being zero. Yet there are some portions ballooned out(
 * the shadow part, which are marked as reserved by drm allocator). From the
 * host point of view, the graphic address space is partitioned by multiple
 * vGPUs in different VMs. ::
 *
 *                        vGPU1 view         Host view
 *             0 ------> +-----------+     +-----------+
 *               ^       |###########|     |   vGPU3   |
 *               |       |###########|     +-----------+
 *               |       |###########|     |   vGPU2   |
 *               |       +-----------+     +-----------+
 *        mappable GM    | available | ==> |   vGPU1   |
 *               |       +-----------+     +-----------+
 *               |       |###########|     |           |
 *               v       |###########|     |   Host    |
 *               +=======+===========+     +===========+
 *               ^       |###########|     |   vGPU3   |
 *               |       |###########|     +-----------+
 *               |       |###########|     |   vGPU2   |
 *               |       +-----------+     +-----------+
 *      unmappable GM    | available | ==> |   vGPU1   |
 *               |       +-----------+     +-----------+
 *               |       |###########|     |           |
 *               |       |###########|     |   Host    |
 *               v       |###########|     |           |
 * total GM size ------> +-----------+     +-----------+
 *
 * Returns:
 * zero on success, non-zero if configuration invalid or ballooning failed
 */
int intel_vgt_balloon(struct drm_i915_private *dev_priv)
{
	struct i915_ggtt *ggtt = &dev_priv->ggtt;
	unsigned long ggtt_end = ggtt->base.start + ggtt->base.total;

	unsigned long mappable_base, mappable_size, mappable_end;
	unsigned long unmappable_base, unmappable_size, unmappable_end;
	int ret;

	if (!intel_vgpu_active(dev_priv))
		return 0;

	mappable_base = I915_READ(vgtif_reg(avail_rs.mappable_gmadr.base));
	mappable_size = I915_READ(vgtif_reg(avail_rs.mappable_gmadr.size));
	unmappable_base = I915_READ(vgtif_reg(avail_rs.nonmappable_gmadr.base));
	unmappable_size = I915_READ(vgtif_reg(avail_rs.nonmappable_gmadr.size));

	mappable_end = mappable_base + mappable_size;
	unmappable_end = unmappable_base + unmappable_size;

	DRM_INFO("VGT ballooning configuration:\n");
	DRM_INFO("Mappable graphic memory: base 0x%lx size %ldKiB\n",
		 mappable_base, mappable_size / 1024);
	DRM_INFO("Unmappable graphic memory: base 0x%lx size %ldKiB\n",
		 unmappable_base, unmappable_size / 1024);

	if (mappable_base < ggtt->base.start ||
	    mappable_end > ggtt->mappable_end ||
	    unmappable_base < ggtt->mappable_end ||
	    unmappable_end > ggtt_end) {
		DRM_ERROR("Invalid ballooning configuration!\n");
		return -EINVAL;
	}

	/* Unmappable graphic memory ballooning */
	if (unmappable_base > ggtt->mappable_end) {
		ret = vgt_balloon_space(&ggtt->base.mm,
					&bl_info.space[2],
					ggtt->mappable_end,
					unmappable_base);

		if (ret)
			goto err;
	}

	/*
	 * No need to partition out the last physical page,
	 * because it is reserved to the guard page.
	 */
	if (unmappable_end < ggtt_end - PAGE_SIZE) {
		ret = vgt_balloon_space(&ggtt->base.mm,
					&bl_info.space[3],
					unmappable_end,
					ggtt_end - PAGE_SIZE);
		if (ret)
			goto err;
	}

	/* Mappable graphic memory ballooning */
	if (mappable_base > ggtt->base.start) {
		ret = vgt_balloon_space(&ggtt->base.mm,
					&bl_info.space[0],
					ggtt->base.start, mappable_base);

		if (ret)
			goto err;
	}

	if (mappable_end < ggtt->mappable_end) {
		ret = vgt_balloon_space(&ggtt->base.mm,
					&bl_info.space[1],
					mappable_end,
					ggtt->mappable_end);

		if (ret)
			goto err;
	}

	DRM_INFO("VGT balloon successfully\n");
	return 0;

err:
	DRM_ERROR("VGT balloon fail\n");
	intel_vgt_deballoon(dev_priv);
	return ret;
}
Commit	Line	Data
cf9d2890 YZ	1	/*
	2	* Copyright(c) 2011-2015 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 "intel_drv.h"
	25	#include "i915_vgpu.h"
	26
	27	/**
	28	* DOC: Intel GVT-g guest 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. This file provides vGPU specific
	35	* optimizations when running in a virtual machine, to reduce the complexity
	36	* of vGPU emulation and to improve the overall performance.
	37	*
	38	* A primary function introduced here is so-called "address space ballooning"
	39	* technique. Intel GVT-g partitions global graphics memory among multiple VMs,
	40	* so each VM can directly access a portion of the memory without hypervisor's
	41	* intervention, e.g. filling textures or queuing commands. However with the
	42	* partitioning an unmodified i915 driver would assume a smaller graphics
	43	* memory starting from address ZERO, then requires vGPU emulation module to
	44	* translate the graphics address between 'guest view' and 'host view', for
	45	* all registers and command opcodes which contain a graphics memory address.
	46	* To reduce the complexity, Intel GVT-g introduces "address space ballooning",
	47	* by telling the exact partitioning knowledge to each guest i915 driver, which
	48	* then reserves and prevents non-allocated portions from allocation. Thus vGPU
	49	* emulation module only needs to scan and validate graphics addresses without
	50	* complexity of address translation.
	51	*
	52	*/
	53
	54	/**
	55	* i915_check_vgpu - detect virtual GPU
14bb2c11	56	* @dev_priv: i915 device private
cf9d2890 YZ	57	*
	58	* This function is called at the initialization stage, to detect whether
	59	* running on a vGPU.
	60	*/
dc97997a	61	void i915_check_vgpu(struct drm_i915_private *dev_priv)
cf9d2890	62	{
cf9d2890 YZ	63	uint64_t magic;
	64	uint32_t version;
	65
	66	BUILD_BUG_ON(sizeof(struct vgt_if) != VGT_PVINFO_SIZE);
	67
75aa3f63	68	magic = __raw_i915_read64(dev_priv, vgtif_reg(magic));
cf9d2890 YZ	69	if (magic != VGT_MAGIC)
	70	return;
	71
	72	version = INTEL_VGT_IF_VERSION_ENCODE(
75aa3f63 VS	73	__raw_i915_read16(dev_priv, vgtif_reg(version_major)),
75aa3f63 VS	74	__raw_i915_read16(dev_priv, vgtif_reg(version_minor)));
cf9d2890 YZ	75	if (version != INTEL_VGT_IF_VERSION) {
	76	DRM_INFO("VGT interface version mismatch!\n");
	77	return;
	78	}
	79
	80	dev_priv->vgpu.active = true;
	81	DRM_INFO("Virtual GPU for Intel GVT-g detected.\n");
	82	}
5dda8fa3 YZ	83
	84	struct _balloon_info_ {
	85	/*
	86	* There are up to 2 regions per mappable/unmappable graphic
	87	* memory that might be ballooned. Here, index 0/1 is for mappable
	88	* graphic memory, 2/3 for unmappable graphic memory.
	89	*/
	90	struct drm_mm_node space[4];
	91	};
	92
	93	static struct _balloon_info_ bl_info;
	94
	95	/**
	96	* intel_vgt_deballoon - deballoon reserved graphics address trunks
	97	*
	98	* This function is called to deallocate the ballooned-out graphic memory, when
	99	* driver is unloaded or when ballooning fails.
	100	*/
b02d22a3	101	void intel_vgt_deballoon(struct drm_i915_private *dev_priv)
5dda8fa3 YZ	102	{
	103	int i;
	104
b02d22a3 ZW	105	if (!intel_vgpu_active(dev_priv))
	106	return;
	107
5dda8fa3 YZ	108	DRM_DEBUG("VGT deballoon.\n");
	109
	110	for (i = 0; i < 4; i++) {
	111	if (bl_info.space[i].allocated)
	112	drm_mm_remove_node(&bl_info.space[i]);
	113	}
	114
	115	memset(&bl_info, 0, sizeof(bl_info));
	116	}
	117
	118	static int vgt_balloon_space(struct drm_mm *mm,
	119	struct drm_mm_node *node,
	120	unsigned long start, unsigned long end)
	121	{
	122	unsigned long size = end - start;
	123
	124	if (start == end)
	125	return -EINVAL;
	126
	127	DRM_INFO("balloon space: range [ 0x%lx - 0x%lx ] %lu KiB.\n",
	128	start, end, size / 1024);
	129
	130	node->start = start;
	131	node->size = size;
	132
	133	return drm_mm_reserve_node(mm, node);
	134	}
	135
	136	/**
	137	* intel_vgt_balloon - balloon out reserved graphics address trunks
14bb2c11	138	* @dev: drm device
5dda8fa3 YZ	139	*
	140	* This function is called at the initialization stage, to balloon out the
	141	* graphic address space allocated to other vGPUs, by marking these spaces as
	142	* reserved. The ballooning related knowledge(starting address and size of
	143	* the mappable/unmappable graphic memory) is described in the vgt_if structure
	144	* in a reserved mmio range.
	145	*
	146	* To give an example, the drawing below depicts one typical scenario after
	147	* ballooning. Here the vGPU1 has 2 pieces of graphic address spaces ballooned
	148	* out each for the mappable and the non-mappable part. From the vGPU1 point of
	149	* view, the total size is the same as the physical one, with the start address
	150	* of its graphic space being zero. Yet there are some portions ballooned out(
	151	* the shadow part, which are marked as reserved by drm allocator). From the
	152	* host point of view, the graphic address space is partitioned by multiple
da5335b8	153	* vGPUs in different VMs. ::
5dda8fa3 YZ	154	*
	155	* vGPU1 view Host view
	156	* 0 ------> +-----------+ +-----------+
da5335b8 DV	157	* ^ \|###########\| \| vGPU3 \|
	158	* \| \|###########\| +-----------+
	159	* \| \|###########\| \| vGPU2 \|
5dda8fa3 YZ	160	* \| +-----------+ +-----------+
	161	* mappable GM \| available \| ==> \| vGPU1 \|
	162	* \| +-----------+ +-----------+
da5335b8 DV	163	* \| \|###########\| \| \|
da5335b8 DV	164	* v \|###########\| \| Host \|
5dda8fa3	165	* +=======+===========+ +===========+
da5335b8 DV	166	* ^ \|###########\| \| vGPU3 \|
	167	* \| \|###########\| +-----------+
	168	* \| \|###########\| \| vGPU2 \|
5dda8fa3 YZ	169	* \| +-----------+ +-----------+
	170	* unmappable GM \| available \| ==> \| vGPU1 \|
	171	* \| +-----------+ +-----------+
da5335b8 DV	172	* \| \|###########\| \| \|
	173	* \| \|###########\| \| Host \|
	174	* v \|###########\| \| \|
5dda8fa3 YZ	175	* total GM size ------> +-----------+ +-----------+
	176	*
	177	* Returns:
	178	* zero on success, non-zero if configuration invalid or ballooning failed
	179	*/
b02d22a3	180	int intel_vgt_balloon(struct drm_i915_private *dev_priv)
5dda8fa3	181	{
72e96d64 JL	182	struct i915_ggtt *ggtt = &dev_priv->ggtt;
72e96d64 JL	183	unsigned long ggtt_end = ggtt->base.start + ggtt->base.total;
5dda8fa3 YZ	184
	185	unsigned long mappable_base, mappable_size, mappable_end;
	186	unsigned long unmappable_base, unmappable_size, unmappable_end;
	187	int ret;
	188
b02d22a3 ZW	189	if (!intel_vgpu_active(dev_priv))
	190	return 0;
	191
5dda8fa3 YZ	192	mappable_base = I915_READ(vgtif_reg(avail_rs.mappable_gmadr.base));
	193	mappable_size = I915_READ(vgtif_reg(avail_rs.mappable_gmadr.size));
	194	unmappable_base = I915_READ(vgtif_reg(avail_rs.nonmappable_gmadr.base));
	195	unmappable_size = I915_READ(vgtif_reg(avail_rs.nonmappable_gmadr.size));
	196
	197	mappable_end = mappable_base + mappable_size;
	198	unmappable_end = unmappable_base + unmappable_size;
	199
	200	DRM_INFO("VGT ballooning configuration:\n");
	201	DRM_INFO("Mappable graphic memory: base 0x%lx size %ldKiB\n",
	202	mappable_base, mappable_size / 1024);
	203	DRM_INFO("Unmappable graphic memory: base 0x%lx size %ldKiB\n",
	204	unmappable_base, unmappable_size / 1024);
	205
72e96d64 JL	206	if (mappable_base < ggtt->base.start \|\|
	207	mappable_end > ggtt->mappable_end \|\|
	208	unmappable_base < ggtt->mappable_end \|\|
	209	unmappable_end > ggtt_end) {
5dda8fa3 YZ	210	DRM_ERROR("Invalid ballooning configuration!\n");
	211	return -EINVAL;
	212	}
	213
	214	/* Unmappable graphic memory ballooning */
72e96d64 JL	215	if (unmappable_base > ggtt->mappable_end) {
72e96d64 JL	216	ret = vgt_balloon_space(&ggtt->base.mm,
5dda8fa3	217	&bl_info.space[2],
72e96d64	218	ggtt->mappable_end,
5dda8fa3 YZ	219	unmappable_base);
	220
	221	if (ret)
	222	goto err;
	223	}
	224
	225	/*
	226	* No need to partition out the last physical page,
	227	* because it is reserved to the guard page.
	228	*/
72e96d64 JL	229	if (unmappable_end < ggtt_end - PAGE_SIZE) {
72e96d64 JL	230	ret = vgt_balloon_space(&ggtt->base.mm,
5dda8fa3 YZ	231	&bl_info.space[3],
5dda8fa3 YZ	232	unmappable_end,
72e96d64	233	ggtt_end - PAGE_SIZE);
5dda8fa3 YZ	234	if (ret)
	235	goto err;
	236	}
	237
	238	/* Mappable graphic memory ballooning */
72e96d64 JL	239	if (mappable_base > ggtt->base.start) {
72e96d64 JL	240	ret = vgt_balloon_space(&ggtt->base.mm,
5dda8fa3	241	&bl_info.space[0],
72e96d64	242	ggtt->base.start, mappable_base);
5dda8fa3 YZ	243
	244	if (ret)
	245	goto err;
	246	}
	247
72e96d64 JL	248	if (mappable_end < ggtt->mappable_end) {
72e96d64 JL	249	ret = vgt_balloon_space(&ggtt->base.mm,
5dda8fa3 YZ	250	&bl_info.space[1],
5dda8fa3 YZ	251	mappable_end,
72e96d64	252	ggtt->mappable_end);
5dda8fa3 YZ	253
	254	if (ret)
	255	goto err;
	256	}
	257
	258	DRM_INFO("VGT balloon successfully\n");
	259	return 0;
	260
	261	err:
	262	DRM_ERROR("VGT balloon fail\n");
b02d22a3	263	intel_vgt_deballoon(dev_priv);
5dda8fa3 YZ	264	return ret;
5dda8fa3 YZ	265	}