[PATCH] drm/i915/gvt: Add runtime_pm get/put to proctect MMIO accessing
Zhenyu Wang
zhenyuw at linux.intel.com
Fri May 26 08:20:12 UTC 2017
On 2017.05.26 13:30:43 +0800, Chuanxiao Dong wrote:
> In some cases, GVT-g is accessing MMIO without holding runtime_pm
> and this patch can add the runtime_pm get/put to make sure when
> accessing MMIO the i915 HW is really powered on.
>
> Cc: Zhenyu Wang <zhenyuw at linux.intel.com>
> Signed-off-by: Chuanxiao Dong <chuanxiao.dong at intel.com>
> ---
> drivers/gpu/drm/i915/gvt/gtt.c | 2 ++
> drivers/gpu/drm/i915/gvt/mmio.c | 4 ++++
> 2 files changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
> index c6f0077..13bfe09 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.c
> +++ b/drivers/gpu/drm/i915/gvt/gtt.c
> @@ -251,8 +251,10 @@ static void write_pte64(struct drm_i915_private *dev_priv,
>
> writeq(pte, addr);
>
> + intel_runtime_pm_get(dev_priv);
> I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
> POSTING_READ(GFX_FLSH_CNTL_GEN6);
> + intel_runtime_pm_put(dev_priv);
> }
>
> static inline struct intel_gvt_gtt_entry *gtt_get_entry64(void *pt,
> diff --git a/drivers/gpu/drm/i915/gvt/mmio.c b/drivers/gpu/drm/i915/gvt/mmio.c
> index 35f6c47..22700ae 100644
> --- a/drivers/gpu/drm/i915/gvt/mmio.c
> +++ b/drivers/gpu/drm/i915/gvt/mmio.c
> @@ -195,7 +195,9 @@ int intel_vgpu_emulate_mmio_read(struct intel_vgpu *vgpu, uint64_t pa,
> if (WARN_ON(mmio->offset != offset))
> goto err;
> }
> + intel_runtime_pm_get(gvt->dev_priv);
> ret = mmio->read(vgpu, offset, p_data, bytes);
> + intel_runtime_pm_put(gvt->dev_priv);
> } else {
> ret = intel_vgpu_default_mmio_read(vgpu, offset, p_data, bytes);
>
> @@ -315,7 +317,9 @@ int intel_vgpu_emulate_mmio_write(struct intel_vgpu *vgpu, uint64_t pa,
> }
>
> if (!ro_mask) {
> + intel_runtime_pm_get(gvt->dev_priv);
> ret = mmio->write(vgpu, offset, p_data, bytes);
> + intel_runtime_pm_put(gvt->dev_priv);
> } else {
> /* Protect RO bits like HW */
> u64 data = 0;
I still think we shouldn't have big hammer here as mostly our handlers
won't invoke hw, might just take care for each specific case.
--
Open Source Technology Center, Intel ltd.
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