diff options
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/Makefile | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 10 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_vgpu.c | 86 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_vgpu.h | 85 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_uncore.c | 3 |
5 files changed, 187 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index f01922591679..f025e7fae253 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -83,6 +83,9 @@ i915-y += dvo_ch7017.o \ intel_sdvo.o \ intel_tv.o +# virtual gpu code +i915-y += i915_vgpu.o + # legacy horrors i915-y += i915_dma.o \ i915_ums.o diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 99b25928df2f..23ae26c42352 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1641,6 +1641,10 @@ struct i915_workarounds { u32 count; }; +struct i915_virtual_gpu { + bool active; +}; + struct drm_i915_private { struct drm_device *dev; struct kmem_cache *slab; @@ -1653,6 +1657,8 @@ struct drm_i915_private { struct intel_uncore uncore; + struct i915_virtual_gpu vgpu; + struct intel_gmbus gmbus[GMBUS_NUM_PORTS]; @@ -2585,6 +2591,10 @@ void intel_uncore_forcewake_get(struct drm_i915_private *dev_priv, void intel_uncore_forcewake_put(struct drm_i915_private *dev_priv, enum forcewake_domains domains); void assert_forcewakes_inactive(struct drm_i915_private *dev_priv); +static inline bool intel_vgpu_active(struct drm_device *dev) +{ + return to_i915(dev)->vgpu.active; +} void i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe, diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c new file mode 100644 index 000000000000..995a6003ed78 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_vgpu.c @@ -0,0 +1,86 @@ +/* + * 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: drm device * + * + * This function is called at the initialization stage, to detect whether + * running on a vGPU. + */ +void i915_check_vgpu(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = to_i915(dev); + uint64_t magic; + uint32_t version; + + BUILD_BUG_ON(sizeof(struct vgt_if) != VGT_PVINFO_SIZE); + + if (!IS_HASWELL(dev)) + return; + + magic = readq(dev_priv->regs + vgtif_reg(magic)); + if (magic != VGT_MAGIC) + return; + + version = INTEL_VGT_IF_VERSION_ENCODE( + readw(dev_priv->regs + vgtif_reg(version_major)), + readw(dev_priv->regs + 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"); +} diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h new file mode 100644 index 000000000000..aa72e146d6c8 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_vgpu.h @@ -0,0 +1,85 @@ +/* + * 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. + */ + +#ifndef _I915_VGPU_H_ +#define _I915_VGPU_H_ + +/* The MMIO offset of the shared info between guest and host emulator */ +#define VGT_PVINFO_PAGE 0x78000 +#define VGT_PVINFO_SIZE 0x1000 + +/* + * The following structure pages are defined in GEN MMIO space + * for virtualization. (One page for now) + */ +#define VGT_MAGIC 0x4776544776544776 /* 'vGTvGTvG' */ +#define VGT_VERSION_MAJOR 1 +#define VGT_VERSION_MINOR 0 + +#define INTEL_VGT_IF_VERSION_ENCODE(major, minor) ((major) << 16 | (minor)) +#define INTEL_VGT_IF_VERSION \ + INTEL_VGT_IF_VERSION_ENCODE(VGT_VERSION_MAJOR, VGT_VERSION_MINOR) + +struct vgt_if { + uint64_t magic; /* VGT_MAGIC */ + uint16_t version_major; + uint16_t version_minor; + uint32_t vgt_id; /* ID of vGT instance */ + uint32_t rsv1[12]; /* pad to offset 0x40 */ + /* + * Data structure to describe the balooning info of resources. + * Each VM can only have one portion of continuous area for now. + * (May support scattered resource in future) + * (starting from offset 0x40) + */ + struct { + /* Aperture register balooning */ + struct { + uint32_t base; + uint32_t size; + } mappable_gmadr; /* aperture */ + /* GMADR register balooning */ + struct { + uint32_t base; + uint32_t size; + } nonmappable_gmadr; /* non aperture */ + /* allowed fence registers */ + uint32_t fence_num; + uint32_t rsv2[3]; + } avail_rs; /* available/assigned resource */ + uint32_t rsv3[0x200 - 24]; /* pad to half page */ + /* + * The bottom half page is for response from Gfx driver to hypervisor. + * Set to reserved fields temporarily by now. + */ + uint32_t rsv4; + uint32_t display_ready; /* ready for display owner switch */ + uint32_t rsv5[0x200 - 2]; /* pad to one page */ +} __packed; + +#define vgtif_reg(x) \ + (VGT_PVINFO_PAGE + (long)&((struct vgt_if *)NULL)->x) + +extern void i915_check_vgpu(struct drm_device *dev); + +#endif /* _I915_VGPU_H_ */ diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 76b60a3538b2..b381c16b97e1 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -23,6 +23,7 @@ #include "i915_drv.h" #include "intel_drv.h" +#include "i915_vgpu.h" #include <linux/pm_runtime.h> @@ -1075,6 +1076,8 @@ void intel_uncore_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; + i915_check_vgpu(dev); + intel_uncore_ellc_detect(dev); intel_uncore_fw_domains_init(dev); __intel_uncore_early_sanitize(dev, false); |
