[Intel-gfx] [PATCH 09/21] drm/i915: enable IPS bit for 64K pages
Matthew Auld
matthew.auld at intel.com
Mon Jul 3 14:14:51 UTC 2017
Before we can enable 64K pages through the IPS bit, we must first enable
it through MMIO, otherwise the page-walker will simply ignore it.
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem.c | 11 +++++++++++
drivers/gpu/drm/i915/i915_reg.h | 3 +++
2 files changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 76b4657e779a..09da46178c31 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4775,6 +4775,17 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv)
}
}
+ /* To support 64K PTE's we need to first enable the use of the
+ * Intermediate-Page-Size(IPS) bit of the PDE field via some magical
+ * mmio, otherwise the page-walker will simply ignore the IPS bit. This
+ * shouldn't be needed after GEN10.
+ */
+ if (HAS_PAGE_SIZE(dev_priv, I915_GTT_PAGE_SIZE_64K) &&
+ INTEL_GEN(dev_priv) <= 10)
+ I915_WRITE(GEN8_GAMW_ECO_DEV_RW_IA,
+ I915_READ(GEN8_GAMW_ECO_DEV_RW_IA) |
+ GAMW_ECO_ENABLE_64K_IPS_FIELD);
+
i915_gem_init_swizzling(dev_priv);
/*
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 64cc674b652a..b812fc5612da 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2190,6 +2190,9 @@ enum skl_disp_power_wells {
#define GEN9_GAMT_ECO_REG_RW_IA _MMIO(0x4ab0)
#define GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS (1<<18)
+#define GEN8_GAMW_ECO_DEV_RW_IA _MMIO(0x4080)
+#define GAMW_ECO_ENABLE_64K_IPS_FIELD 0xF
+
#define GAMT_CHKN_BIT_REG _MMIO(0x4ab8)
#define GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING (1<<28)
--
2.9.4
More information about the Intel-gfx
mailing list