[PATCH 10/10] drm/i915: add enable_guc_loading parameter
Dave Gordon
david.s.gordon at intel.com
Wed Apr 20 18:05:57 UTC 2016
Split the function of "enable_guc_submission" into two separate options.
The new one "enable_guc_loading" controls only the *fetching and loading*
of the GuC firmware image. The existing one is redefined to control only
the *use* of the GuC for batch submission once the firmware is loaded.
In addition, the degree of control has been refined from a simple bool
to an integer key, allowing several options:
-1 (default) whatever the platform default is
0 DISABLE don't load/use the GuC
1 BEST EFFORT try to load/use the GuC, fallback if not available
2 REQUIRE must load/use the GuC, else leave the GPU wedged
The new platform default (as coded here) will be to attempt to load
the GuC iff the device has a GuC that requires firmware, to attempt to
use it iff the device has a GuC that supports the submission protocol
(with or without firmware), and to fall back to execlist mode if any
required firmware cannot be found or fails to load.
Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 1 -
drivers/gpu/drm/i915/i915_params.c | 14 ++++-
drivers/gpu/drm/i915/i915_params.h | 3 +-
drivers/gpu/drm/i915/intel_guc_loader.c | 98 ++++++++++++++++++---------------
4 files changed, 67 insertions(+), 49 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 261a3ef..1ea4546 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4914,7 +4914,6 @@ int i915_gem_init_engines(struct drm_device *dev)
ret = intel_guc_ucode_load(dev);
if (ret) {
DRM_ERROR("Failed to initialize GuC, error %d\n", ret);
- ret = -EIO;
goto out;
}
}
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 1779f02..21f325b 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -54,7 +54,8 @@ struct i915_params i915 __read_mostly = {
.verbose_state_checks = 1,
.nuclear_pageflip = 0,
.edp_vswing = 0,
- .enable_guc_submission = false,
+ .enable_guc_loading = -1,
+ .enable_guc_submission = -1,
.guc_log_level = -1,
.enable_dp_mst = true,
.inject_load_failure = 0,
@@ -197,8 +198,15 @@ struct i915_params i915 __read_mostly = {
"(0=use value from vbt [default], 1=low power swing(200mV),"
"2=default swing(400mV))");
-module_param_named_unsafe(enable_guc_submission, i915.enable_guc_submission, bool, 0400);
-MODULE_PARM_DESC(enable_guc_submission, "Enable GuC submission (default:false)");
+module_param_named_unsafe(enable_guc_loading, i915.enable_guc_loading, int, 0400);
+MODULE_PARM_DESC(enable_guc_submission,
+ "Enable GuC firmware loading "
+ "(-1=auto [default], 0=never, 1=if available, 2=required)");
+
+module_param_named_unsafe(enable_guc_submission, i915.enable_guc_submission, int, 0400);
+MODULE_PARM_DESC(enable_guc_submission,
+ "Enable GuC submission "
+ "(-1=auto [default], 0=never, 1=if available, 2=required)");
module_param_named(guc_log_level, i915.guc_log_level, int, 0400);
MODULE_PARM_DESC(guc_log_level,
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 02bc278..9f1d17b 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -45,6 +45,8 @@ struct i915_params {
int enable_ips;
int invert_brightness;
int enable_cmd_parser;
+ int enable_guc_loading;
+ int enable_guc_submission;
int guc_log_level;
int use_mmio_flip;
int mmio_debug;
@@ -57,7 +59,6 @@ struct i915_params {
bool load_detect_test;
bool reset;
bool disable_display;
- bool enable_guc_submission;
bool verbose_state_checks;
bool nuclear_pageflip;
bool enable_dp_mst;
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 3e14a9a..7f54278 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -387,49 +387,37 @@ int intel_guc_ucode_load(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
+ const char *fw_path = guc_fw->guc_fw_path;
int retries, err = 0;
- if (!i915.enable_guc_submission)
- return 0;
-
- DRM_DEBUG_DRIVER("GuC fw status: fetch %s, load %s\n",
+ DRM_DEBUG_DRIVER("GuC fw status: path %s, fetch %s, load %s\n",
+ fw_path,
intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
- direct_interrupts_to_host(dev_priv);
+ /* Loading forbidden, or no firmware to load? */
+ if (!i915.enable_guc_loading)
+ goto fail;
+ if (fw_path == NULL)
+ goto fail;
+ if (*fw_path == '\0') {
+ DRM_ERROR("No GuC firmware known for this platform\n");
+ goto fail;
+ }
- if (guc_fw->guc_fw_fetch_status == GUC_FIRMWARE_NONE)
- return 0;
+ /* Fetch failed, or already fetched but failed to load? */
+ if (guc_fw->guc_fw_fetch_status != GUC_FIRMWARE_SUCCESS)
+ goto fail;
+ if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_FAIL)
+ goto fail;
- if (guc_fw->guc_fw_fetch_status == GUC_FIRMWARE_SUCCESS &&
- guc_fw->guc_fw_load_status == GUC_FIRMWARE_FAIL)
- return -ENOEXEC;
+ direct_interrupts_to_host(dev_priv);
guc_fw->guc_fw_load_status = GUC_FIRMWARE_PENDING;
- DRM_DEBUG_DRIVER("GuC fw fetch status %s\n",
- intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status));
-
- switch (guc_fw->guc_fw_fetch_status) {
- case GUC_FIRMWARE_FAIL:
- /* something went wrong :( */
- err = -EIO;
- goto fail;
-
- case GUC_FIRMWARE_NONE:
- case GUC_FIRMWARE_PENDING:
- default:
- /* "can't happen" */
- WARN_ONCE(1, "GuC fw %s invalid guc_fw_fetch_status %s [%d]\n",
- guc_fw->guc_fw_path,
- intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
- guc_fw->guc_fw_fetch_status);
- err = -ENXIO;
- goto fail;
-
- case GUC_FIRMWARE_SUCCESS:
- break;
- }
+ DRM_DEBUG_DRIVER("GuC fw status: fetch %s, load %s\n",
+ intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
+ intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
err = i915_guc_submission_init(dev);
if (err)
@@ -480,6 +468,7 @@ int intel_guc_ucode_load(struct drm_device *dev)
fail:
DRM_ERROR("GuC firmware load failed, err %d\n", err);
+
if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_PENDING)
guc_fw->guc_fw_load_status = GUC_FIRMWARE_FAIL;
@@ -487,6 +476,29 @@ int intel_guc_ucode_load(struct drm_device *dev)
i915_guc_submission_disable(dev);
i915_guc_submission_fini(dev);
+ /*
+ * We've failed to load the firmware :(
+ *
+ * Decide whether to disable GuC submission and fall back to
+ * execlist mode, and whether to hide the error by returning
+ * zero or to return -EIO, which the caller will treat as a
+ * nonfatal error (i.e. it doesn't prevent driver load, but
+ * marks the GPU as wedged until reset).
+ */
+ if (i915.enable_guc_loading > 1) {
+ err = -EIO;
+ } else if (HAS_GUC_SCHED(dev) && !HAS_GUC_UCODE(dev)) {
+ return 0;
+ } else if (i915.enable_guc_submission > 1) {
+ err = -EIO;
+ } else {
+ err = 0;
+ }
+
+ i915.enable_guc_submission = 0;
+
+ DRM_DEBUG_DRIVER("falling back to execlist mode, err %d\n", err);
+
return err;
}
@@ -628,8 +640,11 @@ void intel_guc_ucode_init(struct drm_device *dev)
struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
const char *fw_path;
- if (!HAS_GUC_SCHED(dev))
- i915.enable_guc_submission = false;
+ /* A negative value means "use platform default" */
+ if (i915.enable_guc_loading < 0)
+ i915.enable_guc_loading = HAS_GUC_UCODE(dev);
+ if (i915.enable_guc_submission < 0)
+ i915.enable_guc_submission = HAS_GUC_SCHED(dev);
if (!HAS_GUC_UCODE(dev)) {
fw_path = NULL;
@@ -638,26 +653,21 @@ void intel_guc_ucode_init(struct drm_device *dev)
guc_fw->guc_fw_major_wanted = 6;
guc_fw->guc_fw_minor_wanted = 1;
} else {
- i915.enable_guc_submission = false;
fw_path = ""; /* unknown device */
}
- if (!i915.enable_guc_submission)
- return;
-
guc_fw->guc_dev = dev;
guc_fw->guc_fw_path = fw_path;
guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_NONE;
guc_fw->guc_fw_load_status = GUC_FIRMWARE_NONE;
+ /* Early (and silent) return if GuC loading is disabled */
+ if (!i915.enable_guc_loading)
+ return;
if (fw_path == NULL)
return;
-
- if (*fw_path == '\0') {
- DRM_ERROR("No GuC firmware known for this platform\n");
- guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_FAIL;
+ if (*fw_path == '\0')
return;
- }
guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_PENDING;
DRM_DEBUG_DRIVER("GuC firmware pending, path %s\n", fw_path);
--
1.9.1
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