drm/i915: Allow disabling error capture
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
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@ -46,6 +46,19 @@ config DRM_I915_PRELIMINARY_HW_SUPPORT
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If in doubt, say "N".
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config DRM_I915_CAPTURE_ERROR
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bool "Enable capturing GPU state following a hang"
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depends on DRM_I915
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default y
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help
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This option enables capturing the GPU state when a hang is detected.
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This information is vital for triaging hangs and assists in debugging.
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Please report any hang to
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https://bugs.freedesktop.org/enter_bug.cgi?product=DRI
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for triaging.
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If in doubt, say "Y".
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config DRM_I915_USERPTR
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bool "Always enable userptr support"
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depends on DRM_I915
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@ -42,7 +42,6 @@ i915-y += i915_cmd_parser.o \
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i915_gem_stolen.o \
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i915_gem_tiling.o \
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i915_gem_userptr.o \
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i915_gpu_error.o \
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i915_trace_points.o \
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intel_breadcrumbs.o \
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intel_engine_cs.o \
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@ -107,6 +106,9 @@ i915-y += dvo_ch7017.o \
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intel_sdvo.o \
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intel_tv.o
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# Post-mortem debug and GPU hang state capture
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i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o
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# virtual gpu code
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i915-y += i915_vgpu.o
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@ -960,6 +960,8 @@ static int i915_hws_info(struct seq_file *m, void *data)
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return 0;
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}
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#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
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static ssize_t
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i915_error_state_write(struct file *filp,
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const char __user *ubuf,
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@ -1042,6 +1044,8 @@ static const struct file_operations i915_error_state_fops = {
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.release = i915_error_state_release,
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};
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#endif
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static int
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i915_next_seqno_get(void *data, u64 *val)
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{
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@ -5398,7 +5402,9 @@ static const struct i915_debugfs_files {
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{"i915_ring_missed_irq", &i915_ring_missed_irq_fops},
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{"i915_ring_test_irq", &i915_ring_test_irq_fops},
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{"i915_gem_drop_caches", &i915_drop_caches_fops},
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#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
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{"i915_error_state", &i915_error_state_fops},
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#endif
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{"i915_next_seqno", &i915_next_seqno_fops},
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{"i915_display_crc_ctl", &i915_display_crc_ctl_fops},
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{"i915_pri_wm_latency", &i915_pri_wm_latency_fops},
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@ -3544,6 +3544,8 @@ static inline void intel_display_crc_init(struct drm_i915_private *dev_priv) {}
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#endif
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/* i915_gpu_error.c */
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#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
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__printf(2, 3)
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void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...);
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int i915_error_state_to_str(struct drm_i915_error_state_buf *estr,
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@ -3564,6 +3566,20 @@ void i915_error_state_get(struct drm_device *dev,
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void i915_error_state_put(struct i915_error_state_file_priv *error_priv);
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void i915_destroy_error_state(struct drm_device *dev);
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#else
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static inline void i915_capture_error_state(struct drm_i915_private *dev_priv,
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u32 engine_mask,
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const char *error_msg)
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{
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}
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static inline void i915_destroy_error_state(struct drm_device *dev)
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{
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}
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#endif
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const char *i915_cache_level_str(struct drm_i915_private *i915, int type);
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/* i915_cmd_parser.c */
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@ -1464,6 +1464,9 @@ void i915_capture_error_state(struct drm_i915_private *dev_priv,
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struct drm_i915_error_state *error;
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unsigned long flags;
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if (!i915.error_capture)
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return;
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if (READ_ONCE(dev_priv->gpu_error.first_error))
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return;
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@ -47,6 +47,7 @@ struct i915_params i915 __read_mostly = {
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.load_detect_test = 0,
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.force_reset_modeset_test = 0,
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.reset = true,
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.error_capture = true,
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.invert_brightness = 0,
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.disable_display = 0,
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.enable_cmd_parser = 1,
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@ -115,6 +116,14 @@ MODULE_PARM_DESC(vbt_sdvo_panel_type,
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module_param_named_unsafe(reset, i915.reset, bool, 0600);
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MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
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#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
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module_param_named(error_capture, i915.error_capture, bool, 0600);
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MODULE_PARM_DESC(error_capture,
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"Record the GPU state following a hang. "
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"This information in /sys/class/drm/card<N>/error is vital for "
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"triaging and debugging hangs.");
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#endif
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module_param_named_unsafe(enable_hangcheck, i915.enable_hangcheck, bool, 0644);
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MODULE_PARM_DESC(enable_hangcheck,
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"Periodically check GPU activity for detecting hangs. "
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@ -59,6 +59,7 @@ struct i915_params {
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bool load_detect_test;
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bool force_reset_modeset_test;
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bool reset;
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bool error_capture;
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bool disable_display;
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bool verbose_state_checks;
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bool nuclear_pageflip;
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@ -514,6 +514,8 @@ static const struct attribute *vlv_attrs[] = {
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NULL,
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};
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#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
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static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr, char *buf,
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loff_t off, size_t count)
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@ -571,6 +573,21 @@ static struct bin_attribute error_state_attr = {
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.write = error_state_write,
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};
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static void i915_setup_error_capture(struct device *kdev)
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{
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if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
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DRM_ERROR("error_state sysfs setup failed\n");
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}
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static void i915_teardown_error_capture(struct device *kdev)
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{
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sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
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}
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#else
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static void i915_setup_error_capture(struct device *kdev) {}
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static void i915_teardown_error_capture(struct device *kdev) {}
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#endif
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void i915_setup_sysfs(struct drm_i915_private *dev_priv)
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{
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struct device *kdev = dev_priv->drm.primary->kdev;
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@ -617,17 +634,15 @@ void i915_setup_sysfs(struct drm_i915_private *dev_priv)
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if (ret)
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DRM_ERROR("RPS sysfs setup failed\n");
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ret = sysfs_create_bin_file(&kdev->kobj,
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&error_state_attr);
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if (ret)
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DRM_ERROR("error_state sysfs setup failed\n");
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i915_setup_error_capture(kdev);
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}
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void i915_teardown_sysfs(struct drm_i915_private *dev_priv)
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{
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struct device *kdev = dev_priv->drm.primary->kdev;
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sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
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i915_teardown_error_capture(kdev);
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if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
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sysfs_remove_files(&kdev->kobj, vlv_attrs);
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else
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@ -17097,6 +17097,8 @@ int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
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return 0;
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}
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#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
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struct intel_display_error_state {
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u32 power_well_driver;
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err_printf(m, " VSYNC: %08x\n", error->transcoder[i].vsync);
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}
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}
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#endif
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@ -1470,6 +1470,8 @@ void intel_cleanup_overlay(struct drm_i915_private *dev_priv)
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kfree(dev_priv->overlay);
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}
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#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
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struct intel_overlay_error_state {
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struct overlay_registers regs;
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unsigned long base;
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P(UVSCALEV);
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#undef P
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}
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#endif
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