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![Colin Xu](/assets/img/avatar_default.png)
This patch save/restore necessary GVT info during i915 suspend/resume so that GVT enabled QEMU VM can continue running. Only GGTT and fence regs are saved/restored now. GVT will save GGTT entries on each host_entry update, restore the saved dirty entries and re-init fence regs in resume routine. V2: - Change kzalloc/kfree to vzalloc/vfree since the space allocated from kmalloc may not enough for all saved GGTT entries. - Keep gvt suspend/resume wrapper in intel_gvt.h/intel_gvt.c and move the actual implementation to gvt.h/gvt.c. (zhenyu) - Check gvt config on and active with intel_gvt_active(). (zhenyu) V3: (zhenyu) - Incorrect copy length. Should be num entries * entry size. - Use memcpy_toio()/memcpy_fromio() instead of memcpy for iomem. - Add F_PM_SAVE flags to indicate which MMIOs to save/restore for PM. V4: Rebase. V5: Fail intel_gvt_save_ggtt as -ENOMEM if fail to alloc memory to save ggtt. Free allocated ggtt_entries on failure. V6: Save host entry to per-vGPU gtt.ggtt_mm on each host_entry update. V7: Restore GGTT entry based on present bit. Split fence restore and mmio restore in different functions. Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com> Signed-off-by: Hang Yuan <hang.yuan@linux.intel.com> Signed-off-by: Colin Xu <colin.xu@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20201027045308.158955-1-colin.xu@intel.com
164 lines
4.5 KiB
C
164 lines
4.5 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 "i915_drv.h"
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#include "i915_vgpu.h"
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#include "intel_gvt.h"
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#include "gvt/gvt.h"
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/**
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* DOC: Intel GVT-g host support
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*
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* Intel GVT-g is a graphics virtualization technology which shares the
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* GPU among multiple virtual machines on a time-sharing basis. Each
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* virtual machine is presented a virtual GPU (vGPU), which has equivalent
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* features as the underlying physical GPU (pGPU), so i915 driver can run
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* seamlessly in a virtual machine.
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*
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* To virtualize GPU resources GVT-g driver depends on hypervisor technology
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* e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
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* and be virtualized within GVT-g device module. More architectural design
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* doc is available on https://01.org/group/2230/documentation-list.
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*/
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static bool is_supported_device(struct drm_i915_private *dev_priv)
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{
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if (IS_BROADWELL(dev_priv))
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return true;
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if (IS_SKYLAKE(dev_priv))
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return true;
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if (IS_KABYLAKE(dev_priv))
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return true;
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if (IS_BROXTON(dev_priv))
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return true;
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if (IS_COFFEELAKE(dev_priv))
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return true;
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if (IS_COMETLAKE(dev_priv))
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return true;
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return false;
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}
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/**
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* intel_gvt_sanitize_options - sanitize GVT related options
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* @dev_priv: drm i915 private data
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*
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* This function is called at the i915 options sanitize stage.
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*/
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void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
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{
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if (!dev_priv->params.enable_gvt)
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return;
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if (intel_vgpu_active(dev_priv)) {
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drm_info(&dev_priv->drm, "GVT-g is disabled for guest\n");
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goto bail;
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}
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if (!is_supported_device(dev_priv)) {
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drm_info(&dev_priv->drm,
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"Unsupported device. GVT-g is disabled\n");
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goto bail;
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}
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return;
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bail:
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dev_priv->params.enable_gvt = 0;
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}
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/**
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* intel_gvt_init - initialize GVT components
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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 create a GVT device.
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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(struct drm_i915_private *dev_priv)
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{
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int ret;
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if (i915_inject_probe_failure(dev_priv))
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return -ENODEV;
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if (!dev_priv->params.enable_gvt) {
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drm_dbg(&dev_priv->drm,
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"GVT-g is disabled by kernel params\n");
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return 0;
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}
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if (intel_uc_wants_guc_submission(&dev_priv->gt.uc)) {
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drm_err(&dev_priv->drm,
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"i915 GVT-g loading failed due to Graphics virtualization is not yet supported with GuC submission\n");
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return -EIO;
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}
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ret = intel_gvt_init_device(dev_priv);
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if (ret) {
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drm_dbg(&dev_priv->drm, "Fail to init GVT device\n");
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goto bail;
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}
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return 0;
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bail:
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dev_priv->params.enable_gvt = 0;
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return 0;
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}
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static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
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{
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return dev_priv->gvt;
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}
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/**
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* intel_gvt_driver_remove - cleanup GVT components when i915 driver is
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* unbinding
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* @dev_priv: drm i915 private *
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*
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* This function is called at the i915 driver unloading stage, to shutdown
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* GVT components and release the related resources.
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*/
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void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
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{
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if (!intel_gvt_active(dev_priv))
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return;
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intel_gvt_clean_device(dev_priv);
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}
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/**
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* intel_gvt_resume - GVT resume routine wapper
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*
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* @dev_priv: drm i915 private *
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*
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* This function is called at the i915 driver resume stage to restore required
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* HW status for GVT so that vGPU can continue running after resumed.
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*/
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void intel_gvt_resume(struct drm_i915_private *dev_priv)
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{
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if (intel_gvt_active(dev_priv))
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intel_gvt_pm_resume(dev_priv->gvt);
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}
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