On 26/04/2016 10:11, Peter Antoine wrote:
This patch resizes the GuC WOPCM to so that the GuC and the RC6 memory
spaces do not overlap.
Issue: https://jira01.devtools.intel.com/browse/VIZ-6638
Signed-off-by: Peter Antoine <peter.antoine@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_guc_reg.h | 5 +++--
drivers/gpu/drm/i915/intel_guc_loader.c | 6 +++++-
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_guc_reg.h b/drivers/gpu/drm/i915/i915_guc_reg.h
index 80786d9..6e01238 100644
--- a/drivers/gpu/drm/i915/i915_guc_reg.h
+++ b/drivers/gpu/drm/i915/i915_guc_reg.h
@@ -68,10 +68,11 @@
#define GUC_MAX_IDLE_COUNT _MMIO(0xC3E4)
#define GUC_WOPCM_SIZE _MMIO(0xc050)
-#define GUC_WOPCM_SIZE_VALUE (0x80 << 12) /* 512KB */
+#define GUC_WOPCM_SIZE_VALUE (0x80 << 12) /* 512KB */
+#define BXT_GUC_WOPCM_SIZE_VALUE (0x70 << 12) /* 448KB */
/* GuC addresses below GUC_WOPCM_TOP don't map through the GTT */
-#define GUC_WOPCM_TOP (GUC_WOPCM_SIZE_VALUE)
+#define GUC_WOPCM_TOP (0x80 << 12) /* 512KB */
#define GEN8_GT_PM_CONFIG _MMIO(0x138140)
#define GEN9LP_GT_PM_CONFIG _MMIO(0x138140)
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index fc3ff68..38fb321 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -312,7 +312,11 @@ static int guc_ucode_xfer(struct drm_i915_private *dev_priv)
intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
/* init WOPCM */
- I915_WRITE(GUC_WOPCM_SIZE, GUC_WOPCM_SIZE_VALUE);
+ if (IS_BROXTON(dev))
+ I915_WRITE(GUC_WOPCM_SIZE, BXT_GUC_WOPCM_SIZE_VALUE);
+ else
+ I915_WRITE(GUC_WOPCM_SIZE, GUC_WOPCM_SIZE_VALUE);
+
I915_WRITE(DMA_GUC_WOPCM_OFFSET, GUC_WOPCM_OFFSET_VALUE);
/* Enable MIA caching. GuC clock gating is disabled. */
So, this gives the right result, but doesn't really show or explain why
we have different values, or how the values are arrived at; they're just
more magic numbers. Also, in the loader there's a check on the firmware
size that uses different values. So I'd rather prefer the unified
approach in the attached version ...
.Dave.
>From fa0f5e514eea4342933e237e693ea547b9b10f81 Mon Sep 17 00:00:00 2001
From: Peter Antoine <peter.antoine@xxxxxxxxx>
Date: Tue, 26 Apr 2016 10:11:41 +0100
Subject: [PATCH] drm/i915/bxt: reserve space for RC6 in the the GuC WOPCM
Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ
This patch resizes the GuC WOPCM (specifically on BXT)
so that the GuC and RC6 memory spaces do not overlap.
Issue: https://jira01.devtools.intel.com/browse/VIZ-6638
Signed-off-by: Peter Antoine <peter.antoine@xxxxxxxxx>
Signed-off-by: Dave Gordon <david.s.gordon@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_guc_reg.h | 6 +++---
drivers/gpu/drm/i915/intel_guc_loader.c | 17 +++++++++++++----
2 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_guc_reg.h b/drivers/gpu/drm/i915/i915_guc_reg.h
index 80786d9..cf5a65b 100644
--- a/drivers/gpu/drm/i915/i915_guc_reg.h
+++ b/drivers/gpu/drm/i915/i915_guc_reg.h
@@ -67,11 +67,11 @@
#define GUC_WOPCM_OFFSET_VALUE 0x80000 /* 512KB */
#define GUC_MAX_IDLE_COUNT _MMIO(0xC3E4)
+/* Defines WOPCM space available to GuC firmware */
#define GUC_WOPCM_SIZE _MMIO(0xc050)
-#define GUC_WOPCM_SIZE_VALUE (0x80 << 12) /* 512KB */
-
/* GuC addresses below GUC_WOPCM_TOP don't map through the GTT */
-#define GUC_WOPCM_TOP (GUC_WOPCM_SIZE_VALUE)
+#define GUC_WOPCM_TOP (0x80 << 12) /* 512KB */
+#define BXT_GUC_WOPCM_RC6_RESERVED (0x10 << 12) /* 64KB */
#define GEN8_GT_PM_CONFIG _MMIO(0x138140)
#define GEN9LP_GT_PM_CONFIG _MMIO(0x138140)
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 876e5da..80fc1e0 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -281,6 +281,17 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv)
return ret;
}
+static u32 guc_wopcm_size(struct drm_i915_private *dev_priv)
+{
+ u32 wopcm_size = GUC_WOPCM_TOP;
+
+ /* On BXT, the top of WOPCM is reserved for RC6 context */
+ if (IS_BROXTON(dev_priv))
+ wopcm_size -= BXT_GUC_WOPCM_RC6_RESERVED;
+
+ return wopcm_size;
+}
+
/*
* Load the GuC firmware blob into the MinuteIA.
*/
@@ -308,7 +319,7 @@ static int guc_ucode_xfer(struct drm_i915_private *dev_priv)
intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
/* init WOPCM */
- I915_WRITE(GUC_WOPCM_SIZE, GUC_WOPCM_SIZE_VALUE);
+ I915_WRITE(GUC_WOPCM_SIZE, guc_wopcm_size(dev_priv));
I915_WRITE(DMA_GUC_WOPCM_OFFSET, GUC_WOPCM_OFFSET_VALUE);
/* Enable MIA caching. GuC clock gating is disabled. */
@@ -552,9 +563,7 @@ static void guc_fw_fetch(struct drm_device *dev, struct intel_guc_fw *guc_fw)
/* Header and uCode will be loaded to WOPCM. Size of the two. */
size = guc_fw->header_size + guc_fw->ucode_size;
-
- /* Top 32k of WOPCM is reserved (8K stack + 24k RC6 context). */
- if (size > GUC_WOPCM_SIZE_VALUE - 0x8000) {
+ if (size > guc_wopcm_size(dev->dev_private)) {
DRM_ERROR("Firmware is too large to fit in WOPCM\n");
goto fail;
}
--
1.9.1
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