diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 7769e469118f2084f4ee84b70f7aa049cd07239c..8844b99bd760a5c8a0317b9e4a1c06119b185c60 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -46,6 +46,19 @@ config DRM_I915_PRELIMINARY_HW_SUPPORT
If in doubt, say "N".
+config DRM_I915_CAPTURE_ERROR
+ bool "Enable capturing GPU state following a hang"
+ depends on DRM_I915
+ default y
+ help
+ This option enables capturing the GPU state when a hang is detected.
+ This information is vital for triaging hangs and assists in debugging.
+ Please report any hang to
+ https://bugs.freedesktop.org/enter_bug.cgi?product=DRI
+ for triaging.
+
+ If in doubt, say "Y".
+
config DRM_I915_USERPTR
bool "Always enable userptr support"
depends on DRM_I915
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index a998c2bce70a0a6c72ac1bb1671b4ebd311e6c40..8790ae4fb1716d265bb2d433ac4e9e3187088dc9 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -42,7 +42,6 @@ i915-y += i915_cmd_parser.o \
i915_gem_stolen.o \
i915_gem_tiling.o \
i915_gem_userptr.o \
- i915_gpu_error.o \
i915_trace_points.o \
intel_breadcrumbs.o \
intel_engine_cs.o \
@@ -107,6 +106,9 @@ i915-y += dvo_ch7017.o \
intel_sdvo.o \
intel_tv.o
+# Post-mortem debug and GPU hang state capture
+i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o
+
# virtual gpu code
i915-y += i915_vgpu.o
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index f6762e00f87247d28904c2a4d9748f8f0e06a2cf..358663e833d6e7f30f9b6af115d74c83a006097f 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -960,6 +960,8 @@ static int i915_hws_info(struct seq_file *m, void *data)
return 0;
}
+#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
+
static ssize_t
i915_error_state_write(struct file *filp,
const char __user *ubuf,
@@ -1042,6 +1044,8 @@ static const struct file_operations i915_error_state_fops = {
.release = i915_error_state_release,
};
+#endif
+
static int
i915_next_seqno_get(void *data, u64 *val)
{
@@ -5398,7 +5402,9 @@ static const struct i915_debugfs_files {
{"i915_ring_missed_irq", &i915_ring_missed_irq_fops},
{"i915_ring_test_irq", &i915_ring_test_irq_fops},
{"i915_gem_drop_caches", &i915_drop_caches_fops},
+#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
{"i915_error_state", &i915_error_state_fops},
+#endif
{"i915_next_seqno", &i915_next_seqno_fops},
{"i915_display_crc_ctl", &i915_display_crc_ctl_fops},
{"i915_pri_wm_latency", &i915_pri_wm_latency_fops},
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4553a5372008844974b3a435dcd73e398879a1a8..380590b30bbf8008a6db5e326713eb6d41c0597a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3544,6 +3544,8 @@ static inline void intel_display_crc_init(struct drm_i915_private *dev_priv) {}
#endif
/* i915_gpu_error.c */
+#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
+
__printf(2, 3)
void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...);
int i915_error_state_to_str(struct drm_i915_error_state_buf *estr,
@@ -3564,6 +3566,20 @@ void i915_error_state_get(struct drm_device *dev,
void i915_error_state_put(struct i915_error_state_file_priv *error_priv);
void i915_destroy_error_state(struct drm_device *dev);
+#else
+
+static inline void i915_capture_error_state(struct drm_i915_private *dev_priv,
+ u32 engine_mask,
+ const char *error_msg)
+{
+}
+
+static inline void i915_destroy_error_state(struct drm_device *dev)
+{
+}
+
+#endif
+
const char *i915_cache_level_str(struct drm_i915_private *i915, int type);
/* i915_cmd_parser.c */
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 04205c82f0c9734f455f59b380f60fa1487e1aba..c88c0d192a601e6e0004f6b173673a6cec0df496 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1464,6 +1464,9 @@ void i915_capture_error_state(struct drm_i915_private *dev_priv,
struct drm_i915_error_state *error;
unsigned long flags;
+ if (!i915.error_capture)
+ return;
+
if (READ_ONCE(dev_priv->gpu_error.first_error))
return;
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 768ad89d9cd40cf93093713f7db08f7bc10e7ebd..629e4334719ce012a952c3b95fa81b7ef9e09bf2 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -47,6 +47,7 @@ struct i915_params i915 __read_mostly = {
.load_detect_test = 0,
.force_reset_modeset_test = 0,
.reset = true,
+ .error_capture = true,
.invert_brightness = 0,
.disable_display = 0,
.enable_cmd_parser = 1,
@@ -115,6 +116,14 @@ MODULE_PARM_DESC(vbt_sdvo_panel_type,
module_param_named_unsafe(reset, i915.reset, bool, 0600);
MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
+#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
+module_param_named(error_capture, i915.error_capture, bool, 0600);
+MODULE_PARM_DESC(error_capture,
+ "Record the GPU state following a hang. "
+ "This information in /sys/class/drm/card<N>/error is vital for "
+ "triaging and debugging hangs.");
+#endif
+
module_param_named_unsafe(enable_hangcheck, i915.enable_hangcheck, bool, 0644);
MODULE_PARM_DESC(enable_hangcheck,
"Periodically check GPU activity for detecting hangs. "
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 3a0dd78ddb38f88fa7b447a51702f3539c0590d1..94efc899c1efaff338231ede9d11f41bded2b901 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -59,6 +59,7 @@ struct i915_params {
bool load_detect_test;
bool force_reset_modeset_test;
bool reset;
+ bool error_capture;
bool disable_display;
bool verbose_state_checks;
bool nuclear_pageflip;
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 1012eeea132434c30e100c0b5fa16d0b26bd361d..47590ab08d7ea65e7cc94594853117f78e04946b 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -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
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e4bdd3a6a6e35cb1bc8668ba64e086a95b021b41..cfcb03f82016c79c73a2cad5b0337b45f77eb799 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -17097,6 +17097,8 @@ int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
return 0;
}
+#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
+
struct intel_display_error_state {
u32 power_well_driver;
@@ -17279,3 +17281,5 @@ intel_display_print_error_state(struct drm_i915_error_state_buf *m,
err_printf(m, " VSYNC: %08x\n", error->transcoder[i].vsync);
}
}
+
+#endif
diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index a24bc8c7889f04ce3f3d7e2351404e43f777ceef..8c411bfc3b3fa440c566295a4939bca0a6b90ff7 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -1470,6 +1470,8 @@ void intel_cleanup_overlay(struct drm_i915_private *dev_priv)
kfree(dev_priv->overlay);
}
+#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
+
struct intel_overlay_error_state {
struct overlay_registers regs;
unsigned long base;
@@ -1587,3 +1589,5 @@ intel_overlay_print_error_state(struct drm_i915_error_state_buf *m,
P(UVSCALEV);
#undef P
}
+
+#endif