[PATCH v8] drm/i915/icl: Check for fused-off VDBOX and VEBOX instances

Oscar Mateo
2018-01-10T23:03:24Z

In Gen11, the Video Decode engines (aka VDBOX, aka VCS, aka BSD) and the
Video Enhancement engines (aka VEBOX, aka VECS) could be fused off. Also,
each VDBOX and VEBOX has its own power well, which only exist if the related
engine exists in the HW.

Unfortunately, we have a Catch-22 situation going on: we need to read an
MMIO register with the fuse info, but we cannot fully enable MMIO until
we read it (since we need the real engines to initialize the forcewake
domains). We workaround this problem by reading the fuse after the MMIO
is partially ready, but before we initialize forcewake.

Bspec: 20680

v2: We were shifting incorrectly for vebox disable (Vinay)

v3: Assert mmio is ready and warn if we have attempted to initialize
forcewake for fused-off engines (Paulo)

v4:
- Use INTEL_GEN in new code (Tvrtko)
- Shorter local variable (Tvrtko, Michal)
- Keep "if (!...) continue" style (Tvrtko)
- No unnecessary BUG_ON (Tvrtko)
- WARN_ON and cleanup if wrong mask (Tvrtko, Michal)
- Use I915_READ_FW (Michal)
- Use I915_MAX_VCS/VECS macros (Michal)

v5: Rebased by Rodrigo fixing conflicts on top of:
commit 33def1ff7b0 ("drm/i915: Simplify intel_engines_init")

v6: Fix v5. Remove info->num_rings. (by Oscar)

v7: Rebase (Rodrigo).

v8:
- s/intel_device_info_fused_off_engines/intel_device_info_init_mmio (Chris)
- Make vdbox_disable & vebox_disable local variables (Chris)

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
drivers/gpu/drm/i915/i915_drv.c | 2 ++
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_reg.h | 5 +++
drivers/gpu/drm/i915/intel_device_info.c | 54 ++++++++++++++++++++++++++++++++
4 files changed, 62 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 6c8da9d..fc2c1f3 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1018,6 +1018,8 @@ static int i915_driver_init_mmio(struct drm_i915_private *dev_priv)
if (ret < 0)
goto err_bridge;

+ intel_device_info_init_mmio(dev_priv);
+
intel_uncore_init(dev_priv);

intel_uc_init_mmio(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2635e73..f85a047 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3418,6 +3418,7 @@ struct drm_i915_fence_reg *
void i915_gem_revoke_fences(struct drm_i915_private *dev_priv);
void i915_gem_restore_fences(struct drm_i915_private *dev_priv);

+void intel_device_info_init_mmio(struct drm_i915_private *dev_priv);
void i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv);
void i915_gem_object_do_bit_17_swizzle(struct drm_i915_gem_object *obj,
struct sg_table *pages);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 84a3630..c9b6250 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2804,6 +2804,11 @@ enum i915_power_well_id {
#define GEN10_EU_DISABLE3 _MMIO(0x9140)
#define GEN10_EU_DIS_SS_MASK 0xff

+#define GEN11_GT_VEBOX_VDBOX_DISABLE _MMIO(0x9140)
+#define GEN11_GT_VDBOX_DISABLE_MASK 0xff
+#define GEN11_GT_VEBOX_DISABLE_SHIFT 16
+#define GEN11_GT_VEBOX_DISABLE_MASK (0xff << GEN11_GT_VEBOX_DISABLE_SHIFT)
+
#define GEN6_BSD_SLEEP_PSMI_CONTROL _MMIO(0x12050)
#define GEN6_BSD_SLEEP_MSG_DISABLE (1 << 0)
#define GEN6_BSD_SLEEP_FLUSH_DISABLE (1 << 2)
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index 25448e3..4aa4ee4 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -589,3 +589,57 @@ void intel_device_info_runtime_init(struct intel_device_info *info)
/* Initialize command stream timestamp frequency */
info->cs_timestamp_frequency_khz = read_timestamp_frequency(dev_priv);
}
+
+/*
+ * Determine which engines are fused off in our particular hardware.
+ *
+ * This function needs to be called after the MMIO has been setup (as we need
+ * to read registers) but before uncore init (because the powerwell for the
+ * fused off engines doesn't exist, so we cannot initialize forcewake for them)
+ */
+void intel_device_info_init_mmio(struct drm_i915_private *dev_priv)
+{
+ struct intel_device_info *info = mkwrite_device_info(dev_priv);
+ u8 vdbox_disable, vebox_disable;
+ u32 media_fuse;
+ int i;
+
+ if (INTEL_GEN(dev_priv) < 11)
+ return;
+
+ GEM_BUG_ON(!dev_priv->regs);
+
+ media_fuse = I915_READ_FW(GEN11_GT_VEBOX_VDBOX_DISABLE);
+
+ vdbox_disable = media_fuse & GEN11_GT_VDBOX_DISABLE_MASK;
+ vebox_disable = (media_fuse & GEN11_GT_VEBOX_DISABLE_MASK) >>
+ GEN11_GT_VEBOX_DISABLE_SHIFT;
+
+ DRM_DEBUG_DRIVER("vdbox disable: %04x\n", vdbox_disable);
+ for (i = 0; i < I915_MAX_VCS; i++) {
+ if (!HAS_ENGINE(dev_priv, _VCS(i)))
+ continue;
+
+ if (!(BIT(i) & vdbox_disable))
+ continue;
+
+ info->ring_mask &= ~ENGINE_MASK(_VCS(i));
+ WARN_ON(dev_priv->uncore.fw_domains &
+ BIT(FW_DOMAIN_ID_MEDIA_VDBOX0 + i));
+ DRM_DEBUG_DRIVER("vcs%u fused off\n", i);
+ }
+
+ DRM_DEBUG_DRIVER("vebox disable: %04x\n", vebox_disable);
+ for (i = 0; i < I915_MAX_VECS; i++) {
+ if (!HAS_ENGINE(dev_priv, _VECS(i)))
+ continue;
+
+ if (!(BIT(i) & vebox_disable))
+ continue;
+
+ info->ring_mask &= ~ENGINE_MASK(_VECS(i));
+ WARN_ON(dev_priv->uncore.fw_domains &
+ BIT(FW_DOMAIN_ID_MEDIA_VEBOX0 + i));
+ DRM_DEBUG_DRIVER("vecs%u fused off\n", i);
+ }
+}
--
1.9.1