From 517f188c6be5bcc71f92c049d91a26539482a6f8 Mon Sep 17 00:00:00 2001 From: Weinan Li Date: Thu, 26 Jan 2017 13:20:13 +0800 Subject: [PATCH] drm/i915: noop forcewake get/put when vgpu activated For a virtualized GPU, the host maintains the forcewake state on the real device. As we don't control forcewake ourselves, we can simply set force_wake_get() and force_wake_put() to be no-ops. By setting the vfuncs, we adjust both the manual control of forcewake and around the mmio accessors (making our vgpu specific mmio routines redundant and to be removed in the next patch). Signed-off-by: Weinan Li Reviewed-by: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/1485408013-12780-1-git-send-email-weinan.z.li@intel.com Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/intel_uncore.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index abe08885a5ba..da81874dd4a5 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -132,6 +132,13 @@ fw_domains_put(struct drm_i915_private *dev_priv, enum forcewake_domains fw_doma } } +static void +vgpu_fw_domains_nop(struct drm_i915_private *dev_priv, + enum forcewake_domains fw_domains) +{ + /* Guest driver doesn't need to takes care forcewake. */ +} + static void fw_domains_posting_read(struct drm_i915_private *dev_priv) { @@ -1375,6 +1382,11 @@ static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv) FORCEWAKE, FORCEWAKE_ACK); } + if (intel_vgpu_active(dev_priv)) { + dev_priv->uncore.funcs.force_wake_get = vgpu_fw_domains_nop; + dev_priv->uncore.funcs.force_wake_put = vgpu_fw_domains_nop; + } + /* All future platforms are expected to require complex power gating */ WARN_ON(dev_priv->uncore.fw_domains == 0); } -- 2.39.5