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drm/i915/gvt: Add runtime_pm get/put to proctect MMIO accessing

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In some cases, GVT-g is accessing MMIO without holding runtime_pm
and this patch can add the inline API for doing the runtime_pm get/put
to make sure when accessing HW MMIO the i915 HW is really powered on.

Suggested-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Chuanxiao Dong 2017-06-02 15:34:23 +08:00 • committed by Zhenyu Wang
parent 89009b7746
commit 9b7bd65ecd
2 changed files with 22 additions and 0 deletions
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10
drivers/gpu/drm/i915/gvt/gvt.h
View file

@ -477,6 +477,16 @@ enum {
GVT_FAILSAFE_INSUFFICIENT_RESOURCE,
};
static inline void mmio_hw_access_pre(struct drm_i915_private *dev_priv)
{
intel_runtime_pm_get(dev_priv);
}
static inline void mmio_hw_access_post(struct drm_i915_private *dev_priv)
{
intel_runtime_pm_put(dev_priv);
}
#include "trace.h"
#include "mpt.h"

12
drivers/gpu/drm/i915/gvt/handlers.c
View file

@ -209,6 +209,7 @@ static int fence_mmio_read(struct intel_vgpu *vgpu, unsigned int off,
static int fence_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
void *p_data, unsigned int bytes)
{
struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
unsigned int fence_num = offset_to_fence_num(off);
int ret;
@ -217,8 +218,10 @@ static int fence_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
return ret;
write_vreg(vgpu, off, p_data, bytes);
mmio_hw_access_pre(dev_priv);
intel_vgpu_write_fence(vgpu, fence_num,
vgpu_vreg64(vgpu, fence_num_to_offset(fence_num)));
mmio_hw_access_post(dev_priv);
return 0;
}
@ -1265,7 +1268,10 @@ static int gen9_trtte_write(struct intel_vgpu *vgpu, unsigned int offset,
}
write_vreg(vgpu, offset, p_data, bytes);
/* TRTTE is not per-context */
mmio_hw_access_pre(dev_priv);
I915_WRITE(_MMIO(offset), vgpu_vreg(vgpu, offset));
mmio_hw_access_post(dev_priv);
return 0;
}
@ -1278,7 +1284,9 @@ static int gen9_trtt_chicken_write(struct intel_vgpu *vgpu, unsigned int offset,
if (val & 1) {
/* unblock hw logic */
mmio_hw_access_pre(dev_priv);
I915_WRITE(_MMIO(offset), val);
mmio_hw_access_post(dev_priv);
}
write_vreg(vgpu, offset, p_data, bytes);
return 0;
@ -1405,7 +1413,9 @@ static int ring_timestamp_mmio_read(struct intel_vgpu *vgpu,
{
struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
mmio_hw_access_pre(dev_priv);
vgpu_vreg(vgpu, offset) = I915_READ(_MMIO(offset));
mmio_hw_access_post(dev_priv);
return intel_vgpu_default_mmio_read(vgpu, offset, p_data, bytes);
}
@ -1414,7 +1424,9 @@ static int instdone_mmio_read(struct intel_vgpu *vgpu,
{
struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
mmio_hw_access_pre(dev_priv);
vgpu_vreg(vgpu, offset) = I915_READ(_MMIO(offset));
mmio_hw_access_post(dev_priv);
return intel_vgpu_default_mmio_read(vgpu, offset, p_data, bytes);
}