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drm/i915/gvt: Remove MMIO barrier in MMIO switch

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After engine mmio switched, software still need write workload
submission registers. So we can remove the MMIO barriar in MMIO
switch.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Changbin Du 2017-12-08 14:56:22 +08:00 committed by Zhenyu Wang
parent 83164886e4
commit cf27b95034
1 changed files with 0 additions and 12 deletions
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12
drivers/gpu/drm/i915/gvt/render.c
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@ -275,7 +275,6 @@ static void switch_mmio_to_vgpu(struct intel_vgpu *vgpu, int ring_id)
u32 ctx_ctrl = reg_state[CTX_CONTEXT_CONTROL_VAL];
u32 inhibit_mask =
_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
i915_reg_t last_reg = _MMIO(0);
struct engine_mmio *mmio;
u32 v;
@ -305,17 +304,12 @@ static void switch_mmio_to_vgpu(struct intel_vgpu *vgpu, int ring_id)
v = vgpu_vreg(vgpu, mmio->reg);
I915_WRITE_FW(mmio->reg, v);
last_reg = mmio->reg;
trace_render_mmio(vgpu->id, "load",
i915_mmio_reg_offset(mmio->reg),
mmio->value, v);
}
/* Make sure the swiched MMIOs has taken effect. */
if (likely(i915_mmio_reg_offset(last_reg)))
I915_READ_FW(last_reg);
handle_tlb_pending_event(vgpu, ring_id);
}
@ -323,7 +317,6 @@ static void switch_mmio_to_vgpu(struct intel_vgpu *vgpu, int ring_id)
static void switch_mmio_to_host(struct intel_vgpu *vgpu, int ring_id)
{
struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
i915_reg_t last_reg = _MMIO(0);
struct engine_mmio *mmio;
u32 v;
@ -347,16 +340,11 @@ static void switch_mmio_to_host(struct intel_vgpu *vgpu, int ring_id)
continue;
I915_WRITE_FW(mmio->reg, v);
last_reg = mmio->reg;
trace_render_mmio(vgpu->id, "restore",
i915_mmio_reg_offset(mmio->reg),
mmio->value, v);
}
/* Make sure the swiched MMIOs has taken effect. */
if (likely(i915_mmio_reg_offset(last_reg)))
I915_READ_FW(last_reg);
}
/**