Attachment 110129 Details for Bug 85890 – Ignore unclaimed register issues from userspace tools

[patch] Ignore unclaimed register issues from userspace tools

0001-drm-i915-Ignore-unclaimed-reg-errors-due-to-userspac.patch (text/plain), 4.03 KB, created by Daniel Vetter on 2014-11-27 15:17:35 UTC

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Creator: Daniel Vetter

Created: 2014-11-27 15:17:35 UTC

Size: 4.03 KB

patch

obsolete

>From e24af142ec231a4f7d8bd49c89a4d8c431833e95 Mon Sep 17 00:00:00 2001
>From: Daniel Vetter <daniel.vetter@ffwll.ch>
>Date: Thu, 27 Nov 2014 16:15:21 +0100
>Subject: [PATCH] drm/i915: Ignore unclaimed reg errors due to userspace tools
>
>Userspace tooling like the reg dumper don't bother with checking power
>wells and stuff and so cause lots of unclaimed register issues. Which
>then linger and result in fail in subsequent tests.
>
>To figure out whether userspace is doing access abuse the forcewake
>debugfs file and block any unclaimed register errors while that's
>open. Also clear any errors when closing it again.
>
>Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=85890
>Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
>---
> drivers/gpu/drm/i915/i915_debugfs.c |  6 ++++++
> drivers/gpu/drm/i915/i915_drv.h     |  2 ++
> drivers/gpu/drm/i915/intel_uncore.c | 15 +++++++++++++--
> 3 files changed, 21 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
>index 7ea3843ca612..c29040c68240 100644
>--- a/drivers/gpu/drm/i915/i915_debugfs.c
>+++ b/drivers/gpu/drm/i915/i915_debugfs.c
>@@ -4228,6 +4228,8 @@ static int i915_forcewake_open(struct inode *inode, struct file *file)
> 	struct drm_device *dev = inode->i_private;
> 	struct drm_i915_private *dev_priv = dev->dev_private;
> 
>+	atomic_inc(&dev_priv->uncore.user_access_count);
>+
> 	if (INTEL_INFO(dev)->gen < 6)
> 		return 0;
> 
>@@ -4241,6 +4243,10 @@ static int i915_forcewake_release(struct inode *inode, struct file *file)
> 	struct drm_device *dev = inode->i_private;
> 	struct drm_i915_private *dev_priv = dev->dev_private;
> 
>+	atomic_dec(&dev_priv->uncore.user_access_count);
>+
>+	intel_uncore_reset_errors(dev);
>+
> 	if (INTEL_INFO(dev)->gen < 6)
> 		return 0;
> 
>diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>index 049482f5d9ac..6795d5a86fdf 100644
>--- a/drivers/gpu/drm/i915/i915_drv.h
>+++ b/drivers/gpu/drm/i915/i915_drv.h
>@@ -561,6 +561,7 @@ struct intel_uncore {
> 
> 	unsigned fifo_count;
> 	unsigned forcewake_count;
>+	atomic_t user_access_count;
> 
> 	unsigned fw_rendercount;
> 	unsigned fw_mediacount;
>@@ -2411,6 +2412,7 @@ extern void intel_uncore_sanitize(struct drm_device *dev);
> extern void intel_uncore_early_sanitize(struct drm_device *dev,
> 					bool restore_forcewake);
> extern void intel_uncore_init(struct drm_device *dev);
>+extern void intel_uncore_reset_errors(struct drm_device *dev);
> extern void intel_uncore_check_errors(struct drm_device *dev);
> extern void intel_uncore_fini(struct drm_device *dev);
> extern void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore);
>diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
>index 46de8d75b4bf..5bb22e03f3c3 100644
>--- a/drivers/gpu/drm/i915/intel_uncore.c
>+++ b/drivers/gpu/drm/i915/intel_uncore.c
>@@ -718,7 +718,8 @@ hsw_unclaimed_reg_debug(struct drm_i915_private *dev_priv, u32 reg, bool read,
> 	const char *op = read ? "reading" : "writing to";
> 	const char *when = before ? "before" : "after";
> 
>-	if (!i915.mmio_debug)
>+	if (!i915.mmio_debug ||
>+	    atomic_read(&dev_priv->uncore.user_accces_count))
> 		return;
> 
> 	if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
>@@ -731,7 +732,7 @@ hsw_unclaimed_reg_debug(struct drm_i915_private *dev_priv, u32 reg, bool read,
> static void
> hsw_unclaimed_reg_detect(struct drm_i915_private *dev_priv)
> {
>-	if (i915.mmio_debug)
>+	if (i915.mmio_debug || atomic_read(&dev_priv->uncore.user_accces_count))
> 		return;
> 
> 	if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
>@@ -1470,6 +1471,16 @@ int intel_gpu_reset(struct drm_device *dev)
> 		return -ENODEV;
> }
> 
>+void intel_uncore_reset_errors(struct drm_device *dev)
>+{
>+	struct drm_i915_private *dev_priv = dev->dev_private;
>+
>+	if (HAS_FPGA_DBG_UNCLAIMED(dev) &&
>+	    (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
>+		__raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
>+	}
>+}
>+
> void intel_uncore_check_errors(struct drm_device *dev)
> {
> 	struct drm_i915_private *dev_priv = dev->dev_private;
>-- 
>2.1.1
>

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