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drm/i915/gvt: optimize the inhibit context mmio load 

For the inhibit ctx, load all mmio in render mmio list
into HW by MMIO write for ctx initialization.

For the none-inhibit ctx, only load the render mmio which
is not in_context into HW by MMIO write. Skip the MMIO write
for in_context mmio as context image will load it.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Chuanxiao Dong 2017-02-14 15:14:05 +08:00 committed by Zhenyu Wang
parent 6e27d51457
commit bc6a1c8579
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/i915/gvt/render.c
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@ -236,12 +236,18 @@ static void restore_mocs(struct intel_vgpu *vgpu, int ring_id)
}
}
#define CTX_CONTEXT_CONTROL_VAL 0x03
void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id)
{
struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
struct render_mmio *mmio;
u32 v;
int i, array_size;
u32 *reg_state = vgpu->shadow_ctx->engine[ring_id].lrc_reg_state;
u32 ctx_ctrl = reg_state[CTX_CONTEXT_CONTROL_VAL];
u32 inhibit_mask =
_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
if (IS_SKYLAKE(vgpu->gvt->dev_priv)) {
mmio = gen9_render_mmio_list;
@ -257,6 +263,17 @@ void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id)
continue;
mmio->value = I915_READ(mmio->reg);
/*
* if it is an inhibit context, load in_context mmio
* into HW by mmio write. If it is not, skip this mmio
* write.
*/
if (mmio->in_context &&
((ctx_ctrl & inhibit_mask) != inhibit_mask) &&
i915.enable_execlists)
continue;
if (mmio->mask)
v = vgpu_vreg(vgpu, mmio->reg) | (mmio->mask << 16);
else