Load host render mocs registers once for delta update of mocs switch, it
reduces mmio read times obviously, then brings performance improvement
during multi-vms switch.
Signed-off-by: Weinan Li <weinan.z...@intel.com>
---
drivers/gpu/drm/i915/gvt/mmio_context.c | 51 +++++++++++++++++++++++++++------
1 file changed, 42 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/mmio_context.c
b/drivers/gpu/drm/i915/gvt/mmio_context.c
index 06ea3d2..94ac939 100644
--- a/drivers/gpu/drm/i915/gvt/mmio_context.c
+++ b/drivers/gpu/drm/i915/gvt/mmio_context.c
@@ -149,8 +149,41 @@
{ /* Terminated */ }
};
-static u32 gen9_render_mocs[I915_NUM_ENGINES][64];
-static u32 gen9_render_mocs_L3[32];
+static struct {
+ bool initialized;
+ u32 control_table[I915_NUM_ENGINES][64];
+ u32 l3cc_table[32];
+} gen9_render_mocs;
+
+static void load_render_mocs(struct drm_i915_private *dev_priv)
+{
+ i915_reg_t offset;
+ u32 regs[] = {
+ [RCS] = 0xc800,
+ [VCS] = 0xc900,
+ [VCS2] = 0xca00,
+ [BCS] = 0xcc00,
+ [VECS] = 0xcb00,
+ };
+ int ring_id, i;
+
+ for (ring_id = 0; ring_id < I915_NUM_ENGINES; ring_id++) {
+ offset.reg = regs[ring_id];
+ for (i = 0; i < 64; i++) {
+ gen9_render_mocs.control_table[ring_id][i] =
+ I915_READ_FW(offset);
+ offset.reg += 4;
+ }
+ }
+
+ offset.reg = 0xb020;
+ for (i = 0; i < 32; i++) {
+ gen9_render_mocs.l3cc_table[i] =
+ I915_READ_FW(offset);
+ offset.reg += 4;
+ }
+ gen9_render_mocs.initialized = true;
+}
static void handle_tlb_pending_event(struct intel_vgpu *vgpu, int ring_id)
{
@@ -218,18 +251,19 @@ static void switch_mocs(struct intel_vgpu *pre, struct
intel_vgpu *next,
if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
return;
- offset.reg = regs[ring_id];
+ if (!pre && !gen9_render_mocs.initialized)
+ load_render_mocs(dev_priv);
+ offset.reg = regs[ring_id];
for (i = 0; i < 64; i++) {
if (pre)
old_v = vgpu_vreg(pre, offset);
else
- old_v = gen9_render_mocs[ring_id][i]
- = I915_READ_FW(offset);
+ old_v = gen9_render_mocs.control_table[ring_id][i];
if (next)
new_v = vgpu_vreg(next, offset);
else
- new_v = gen9_render_mocs[ring_id][i];
+ new_v = gen9_render_mocs.control_table[ring_id][i];
if (old_v != new_v)
I915_WRITE_FW(offset, new_v);
@@ -243,12 +277,11 @@ static void switch_mocs(struct intel_vgpu *pre, struct
intel_vgpu *next,
if (pre)
old_v = vgpu_vreg(pre, l3_offset);
else
- old_v = gen9_render_mocs_L3[i]
- = I915_READ_FW(offset);
+ old_v = gen9_render_mocs.l3cc_table[i];
if (next)
new_v = vgpu_vreg(next, l3_offset);
else
- new_v = gen9_render_mocs_L3[i];
+ new_v = gen9_render_mocs.l3cc_table[i];
if (old_v != new_v)
I915_WRITE_FW(l3_offset, new_v);
--
1.9.1
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