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drm/i915: Allow disabling error capture

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We currently capture the GPU state after we detect a hang. This is vital
for us to both triage and debug hangs in the wild (post-mortem
debugging). However, it comes at the cost of running some potentially
dangerous code (since it has to make very few assumption about the state
of the driver) that is quite resource intensive.

This patch introduces both a method to disable error capture at runtime
(for users who hit bugs at runtime and need a workaround) and to disable
error capture at compiletime (for realtime users who want to minimise
any possible latency, and never require error capture, saving ~30k of
code). The cost is that we now have to be wary of (and test!) a kconfig
flag and a module parameter. The effect of the module parameter is easy
to verify through code inspection and runtime testing, but a kconfig flag
needs regular compile checking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch
Link: http://patchwork.freedesktop.org/patch/msgid/20161012090522.367-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2016-10-12 10:05:18 +01:00
父節點 0e70447605
當前提交 98a2f41167
共有 10 個文件被更改，包括 79 次插入 和 6 次删除
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25
drivers/gpu/drm/i915/i915_sysfs.c
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@@ -514,6 +514,8 @@ static const struct attribute *vlv_attrs[] = {
NULL,
};
#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
@@ -571,6 +573,21 @@ static struct bin_attribute error_state_attr = {
.write = error_state_write,
};
static void i915_setup_error_capture(struct device *kdev)
{
if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
DRM_ERROR("error_state sysfs setup failed\n");
}
static void i915_teardown_error_capture(struct device *kdev)
{
sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
}
#else
static void i915_setup_error_capture(struct device *kdev) {}
static void i915_teardown_error_capture(struct device *kdev) {}
#endif
void i915_setup_sysfs(struct drm_i915_private *dev_priv)
{
struct device *kdev = dev_priv->drm.primary->kdev;
@@ -617,17 +634,15 @@ void i915_setup_sysfs(struct drm_i915_private *dev_priv)
if (ret)
DRM_ERROR("RPS sysfs setup failed\n");
ret = sysfs_create_bin_file(&kdev->kobj,
&error_state_attr);
if (ret)
DRM_ERROR("error_state sysfs setup failed\n");
i915_setup_error_capture(kdev);
}
void i915_teardown_sysfs(struct drm_i915_private *dev_priv)
{
struct device *kdev = dev_priv->drm.primary->kdev;
sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
i915_teardown_error_capture(kdev);
if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
sysfs_remove_files(&kdev->kobj, vlv_attrs);
else