On 2020.08.26 14:35:05 +0800, Colin Xu wrote:
> 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 into GVT in suspend routine, and restore the saved 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)
>
> Signed-off-by: Hang Yuan <hang.yuan@xxxxxxxxxxxxxxx>
> Signed-off-by: Colin Xu <colin.xu@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gvt/gtt.c | 73 +++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/gvt/gtt.h | 2 +
> drivers/gpu/drm/i915/gvt/gvt.c | 15 ++++++
> drivers/gpu/drm/i915/gvt/gvt.h | 6 +++
> drivers/gpu/drm/i915/gvt/handlers.c | 20 ++++++++
> drivers/gpu/drm/i915/gvt/mmio.h | 3 ++
> drivers/gpu/drm/i915/gvt/vgpu.c | 1 +
> drivers/gpu/drm/i915/intel_gvt.c | 29 ++++++++++++
> drivers/gpu/drm/i915/intel_gvt.h | 10 ++++
> 9 files changed, 159 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
> index 04bf018ecc34..7907a535d49f 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.c
> +++ b/drivers/gpu/drm/i915/gvt/gtt.c
> @@ -2533,6 +2533,11 @@ static void intel_vgpu_destroy_ggtt_mm(struct intel_vgpu *vgpu)
> }
> intel_vgpu_destroy_mm(vgpu->gtt.ggtt_mm);
> vgpu->gtt.ggtt_mm = NULL;
> +
> + if (vgpu->ggtt_entries) {
> + vfree(vgpu->ggtt_entries);
> + vgpu->ggtt_entries = NULL;
> + }
> }
>
> /**
> @@ -2834,3 +2839,71 @@ void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu, bool invalidate_old)
>
> ggtt_invalidate(gvt->gt);
> }
> +
> +/**
> + * intel_gvt_save_ggtt - save all vGPU's ggtt entries
> + * @gvt: intel gvt device
> + *
> + * This function is called at driver suspend stage to save
> + * GGTT entries of every active vGPU.
> + *
> + */
> +void intel_gvt_save_ggtt(struct intel_gvt *gvt)
> +{
> + struct intel_vgpu *vgpu;
> + int id;
> + u32 index, num_low, num_hi;
> + void __iomem *addr;
> +
> + for_each_active_vgpu(gvt, vgpu, id) {
> + num_low = vgpu_aperture_sz(vgpu) >> PAGE_SHIFT;
> + num_hi = vgpu_hidden_sz(vgpu) >> PAGE_SHIFT;
> + vgpu->ggtt_entries = vzalloc((num_low + num_hi) * sizeof(u64));
> + if (!vgpu->ggtt_entries)
> + continue;
> +
> + index = vgpu_aperture_gmadr_base(vgpu) >> PAGE_SHIFT;
> + addr = (gen8_pte_t __iomem *)gvt->gt->i915->ggtt.gsm + index;
> + memcpy(vgpu->ggtt_entries, addr, num_low);
Should use memcpy_fromio() and is the size right? It's the number of entries
instead of bytes count?
> +
> + index = vgpu_hidden_gmadr_base(vgpu) >> PAGE_SHIFT;
> + addr = (gen8_pte_t __iomem *)gvt->gt->i915->ggtt.gsm + index;
> + memcpy((u64 *)vgpu->ggtt_entries + num_low, addr, num_hi);
> + }
ditto
> +}
> +
> +/**
> + * intel_gvt_restore_ggtt - restore all vGPU's ggtt entries
> + * @gvt: intel gvt device
> + *
> + * This function is called at driver resume stage to restore
> + * GGTT entries of every active vGPU.
> + *
> + */
> +void intel_gvt_restore_ggtt(struct intel_gvt *gvt)
> +{
> + struct intel_vgpu *vgpu;
> + int id;
> + u32 index, num_low, num_hi;
> + void __iomem *addr;
> +
> + for_each_active_vgpu(gvt, vgpu, id) {
> + if (!vgpu->ggtt_entries) {
> + gvt_vgpu_err("fail to get saved ggtt\n");
> + continue;
> + }
> +
> + num_low = vgpu_aperture_sz(vgpu) >> PAGE_SHIFT;
> + num_hi = vgpu_hidden_sz(vgpu) >> PAGE_SHIFT;
> +
> + index = vgpu_aperture_gmadr_base(vgpu) >> PAGE_SHIFT;
> + addr = (gen8_pte_t __iomem *)gvt->gt->i915->ggtt.gsm + index;
> + memcpy(addr, vgpu->ggtt_entries, num_low);
memcpy_toio()
> + index = vgpu_hidden_gmadr_base(vgpu) >> PAGE_SHIFT;
> + addr = (gen8_pte_t __iomem *)gvt->gt->i915->ggtt.gsm + index;
> + memcpy(addr, (u64 *)vgpu->ggtt_entries + num_low, num_hi);
> +
> + vfree(vgpu->ggtt_entries);
> + vgpu->ggtt_entries = NULL;
> + }
> +}
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.h b/drivers/gpu/drm/i915/gvt/gtt.h
> index b76a262dd9bc..0d2fb2714852 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.h
> +++ b/drivers/gpu/drm/i915/gvt/gtt.h
> @@ -279,5 +279,7 @@ int intel_vgpu_emulate_ggtt_mmio_write(struct intel_vgpu *vgpu,
> unsigned int off, void *p_data, unsigned int bytes);
>
> void intel_vgpu_destroy_all_ppgtt_mm(struct intel_vgpu *vgpu);
> +void intel_gvt_save_ggtt(struct intel_gvt *gvt);
> +void intel_gvt_restore_ggtt(struct intel_gvt *gvt);
>
> #endif /* _GVT_GTT_H_ */
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
> index c7c561237883..3de740fa0911 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.c
> +++ b/drivers/gpu/drm/i915/gvt/gvt.c
> @@ -405,6 +405,21 @@ int intel_gvt_init_device(struct drm_i915_private *i915)
> return ret;
> }
>
> +int
> +intel_gvt_pm_suspend(struct intel_gvt *gvt)
> +{
> + intel_gvt_save_ggtt(gvt);
> + return 0;
> +}
> +
> +int
> +intel_gvt_pm_resume(struct intel_gvt *gvt)
> +{
> + intel_gvt_restore_regs(gvt);
> + intel_gvt_restore_ggtt(gvt);
> + return 0;
> +}
> +
> int
> intel_gvt_register_hypervisor(struct intel_gvt_mpt *m)
> {
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
> index 9831361f181e..6d99bb970214 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.h
> +++ b/drivers/gpu/drm/i915/gvt/gvt.h
> @@ -199,9 +199,13 @@ struct intel_vgpu {
> struct intel_vgpu_submission submission;
> struct radix_tree_root page_track_tree;
> u32 hws_pga[I915_NUM_ENGINES];
> +
> /* Set on PCI_D3, reset on DMLR, not reflecting the actual PM state */
> bool d3_entered;
>
> + /* Saved GGTT entries during host suspend state */
> + u64 *ggtt_entries;
> +
> struct dentry *debugfs;
>
> /* Hypervisor-specific device state. */
> @@ -685,6 +689,8 @@ void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu);
> void intel_gvt_debugfs_init(struct intel_gvt *gvt);
> void intel_gvt_debugfs_clean(struct intel_gvt *gvt);
>
> +int intel_gvt_pm_suspend(struct intel_gvt *gvt);
> +int intel_gvt_pm_resume(struct intel_gvt *gvt);
>
> #include "trace.h"
> #include "mpt.h"
> diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
> index 72860aaf1656..24e9dde656a4 100644
> --- a/drivers/gpu/drm/i915/gvt/handlers.c
> +++ b/drivers/gpu/drm/i915/gvt/handlers.c
> @@ -3642,3 +3642,23 @@ int intel_vgpu_mmio_reg_rw(struct intel_vgpu *vgpu, unsigned int offset,
> intel_vgpu_default_mmio_read(vgpu, offset, pdata, bytes) :
> intel_vgpu_default_mmio_write(vgpu, offset, pdata, bytes);
> }
> +
> +void intel_gvt_restore_regs(struct intel_gvt *gvt)
> +{
> + struct drm_i915_private *dev_priv = gvt->gt->i915;
> + struct intel_vgpu *vgpu;
> + int i, id;
> + u64 val;
> +
> + for_each_active_vgpu(gvt, vgpu, id) {
> + mmio_hw_access_pre(gvt->gt);
> + for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
> + val = vgpu_vreg64(vgpu, fence_num_to_offset(i));
> + intel_vgpu_write_fence(vgpu, i, val);
> + }
> +
> + I915_WRITE(_MMIO(TRTTE.reg), vgpu_vreg(vgpu, TRTTE.reg));
I915_WRITE(TRTTE, vgpu_vreg_t(vgpu, TRTTE));
> + I915_WRITE(_MMIO(0x4dfc), vgpu_vreg(vgpu, 0x4dfc));
Could we have an extra bit flag to tell which regs are required for suspend
restore?
> + mmio_hw_access_post(gvt->gt);
> + }
> +}
> diff --git a/drivers/gpu/drm/i915/gvt/mmio.h b/drivers/gpu/drm/i915/gvt/mmio.h
> index cc4812648bf4..999d9dda0614 100644
> --- a/drivers/gpu/drm/i915/gvt/mmio.h
> +++ b/drivers/gpu/drm/i915/gvt/mmio.h
> @@ -104,4 +104,7 @@ int intel_vgpu_mmio_reg_rw(struct intel_vgpu *vgpu, unsigned int offset,
>
> int intel_vgpu_mask_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
> void *p_data, unsigned int bytes);
> +
> +void intel_gvt_restore_regs(struct intel_gvt *gvt);
> +
> #endif
> diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
> index e0e073045d83..a0c1c47a842b 100644
> --- a/drivers/gpu/drm/i915/gvt/vgpu.c
> +++ b/drivers/gpu/drm/i915/gvt/vgpu.c
> @@ -395,6 +395,7 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
> idr_init(&vgpu->object_idr);
> intel_vgpu_init_cfg_space(vgpu, param->primary);
> vgpu->d3_entered = false;
> + vgpu->ggtt_entries = NULL;
>
> ret = intel_vgpu_init_mmio(vgpu);
> if (ret)
> diff --git a/drivers/gpu/drm/i915/intel_gvt.c b/drivers/gpu/drm/i915/intel_gvt.c
> index 99fe8aef1c67..33650daef567 100644
> --- a/drivers/gpu/drm/i915/intel_gvt.c
> +++ b/drivers/gpu/drm/i915/intel_gvt.c
> @@ -24,6 +24,7 @@
> #include "i915_drv.h"
> #include "i915_vgpu.h"
> #include "intel_gvt.h"
> +#include "gvt/gvt.h"
>
> /**
> * DOC: Intel GVT-g host support
> @@ -147,3 +148,31 @@ void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
>
> intel_gvt_clean_device(dev_priv);
> }
> +
> +/**
> + * intel_gvt_suspend - GVT suspend routine wapper
> + *
> + * @dev_priv: drm i915 private *
> + *
> + * This function is called at the i915 driver suspend stage to save necessary
> + * HW status for GVT so that vGPU can continue running after resume.
> + */
> +void intel_gvt_suspend(struct drm_i915_private *dev_priv)
> +{
> + if (intel_gvt_active(dev_priv))
> + intel_gvt_pm_suspend(dev_priv->gvt);
> +}
> +
> +/**
> + * intel_gvt_suspend - GVT resume routine wapper
> + *
> + * @dev_priv: drm i915 private *
> + *
> + * This function is called at the i915 driver resume stage to restore required
> + * HW status for GVT so that vGPU can continue running after resumed.
> + */
> +void intel_gvt_resume(struct drm_i915_private *dev_priv)
> +{
> + if (intel_gvt_active(dev_priv))
> + intel_gvt_pm_resume(dev_priv->gvt);
> +}
> diff --git a/drivers/gpu/drm/i915/intel_gvt.h b/drivers/gpu/drm/i915/intel_gvt.h
> index 502fad8a8652..5732c7b10ab2 100644
> --- a/drivers/gpu/drm/i915/intel_gvt.h
> +++ b/drivers/gpu/drm/i915/intel_gvt.h
> @@ -33,6 +33,8 @@ int intel_gvt_init_device(struct drm_i915_private *dev_priv);
> void intel_gvt_clean_device(struct drm_i915_private *dev_priv);
> int intel_gvt_init_host(void);
> void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv);
> +void intel_gvt_suspend(struct drm_i915_private *dev_priv);
> +void intel_gvt_resume(struct drm_i915_private *dev_priv);
> #else
> static inline int intel_gvt_init(struct drm_i915_private *dev_priv)
> {
> @@ -46,6 +48,14 @@ static inline void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
> static inline void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
> {
> }
> +
> +static inline void intel_gvt_suspend(struct drm_i915_private *dev_priv)
> +{
> +}
> +
> +static inline void intel_gvt_resume(struct drm_i915_private *dev_priv)
> +{
> +}
> #endif
>
> #endif /* _INTEL_GVT_H_ */
> --
> 2.28.0
>
--
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