[PATCH 7/8] drm/i915/guc: Simplify intel_guc_init_hw()

Arkadiusz Hiler
2017-02-17T13:06:18Z

Current version of intel_guc_init_hw() does a lot:
- cares about submission
- loads huc
- implement WA

This change offloads some of the logic to intel_uc_load(), which now
cares about the above.

v2: rename guc_hw_reset and fix typo in define name (M. Wajdeczko)

Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/intel_guc_loader.c | 136 +++-----------------------------
drivers/gpu/drm/i915/intel_uc.c | 105 ++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_uc.h | 5 ++
4 files changed, 123 insertions(+), 125 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index fa2ca05..c3147f5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4499,7 +4499,7 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv)
intel_mocs_init_l3cc_table(dev_priv);

/* We can't enable contexts until all firmware is loaded */
- ret = intel_guc_init_hw(dev_priv);
+ ret = intel_uc_init_hw(dev_priv);
if (ret)
goto out;

diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index e74c127..549a254 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -90,7 +90,7 @@ const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status)
}
};

-static void guc_interrupts_release(struct drm_i915_private *dev_priv)
+void intel_guc_interrupts_release(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
@@ -108,7 +108,7 @@ static void guc_interrupts_release(struct drm_i915_private *dev_priv)
I915_WRITE(GUC_WD_VECS_IER, 0);
}

-static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
+void intel_guc_interrupts_capture(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
@@ -408,24 +408,6 @@ static int guc_ucode_xfer(struct drm_i915_private *dev_priv)
return ret;
}

-static int guc_hw_reset(struct drm_i915_private *dev_priv)
-{
- int ret;
- u32 guc_status;
-
- ret = intel_guc_reset(dev_priv);
- if (ret) {
- DRM_ERROR("GuC reset failed, ret = %d\n", ret);
- return ret;
- }
-
- guc_status = I915_READ(GUC_STATUS);
- WARN(!(guc_status & GS_MIA_IN_RESET),
- "GuC status: 0x%x, MIA core expected to be in reset\n", guc_status);
-
- return ret;
-}
-
/**
* intel_guc_init_hw() - finish preparing the GuC for activity
* @dev_priv: i915 device private
@@ -443,147 +425,53 @@ int intel_guc_init_hw(struct drm_i915_private *dev_priv)
{
struct intel_uc_fw *guc_fw = &dev_priv->guc.fw;
const char *fw_path = guc_fw->path;
- int retries, ret, err;
+ int ret;

DRM_DEBUG_DRIVER("GuC fw status: path %s, fetch %s, load %s\n",
fw_path,
intel_uc_fw_status_repr(guc_fw->fetch_status),
intel_uc_fw_status_repr(guc_fw->load_status));

- /* Loading forbidden, or no firmware to load? */
- if (!i915.enable_guc_loading) {
- err = 0;
- goto fail;
- } else if (fw_path == NULL) {
+ if (fw_path == NULL) {
/* Device is known to have no uCode (e.g. no GuC) */
- err = -ENXIO;
- goto fail;
+ return -ENXIO;
} else if (*fw_path == '\0') {
/* Device has a GuC but we don't know what f/w to load? */
WARN(1, "No GuC firmware known for this platform!\n");
- err = -ENODEV;
- goto fail;
+ return -ENODEV;
}

/* Fetch failed, or already fetched but failed to load? */
if (guc_fw->fetch_status != INTEL_UC_FIRMWARE_SUCCESS) {
- err = -EIO;
- goto fail;
+ return -EIO;
} else if (guc_fw->load_status == INTEL_UC_FIRMWARE_FAIL) {
- err = -ENOEXEC;
- goto fail;
+ return -ENOEXEC;
}

- guc_interrupts_release(dev_priv);
- gen9_reset_guc_interrupts(dev_priv);
-
- /* We need to notify the guc whenever we change the GGTT */
- i915_ggtt_enable_guc(dev_priv);
-
guc_fw->load_status = INTEL_UC_FIRMWARE_PENDING;

DRM_DEBUG_DRIVER("GuC fw status: fetch %s, load %s\n",
intel_uc_fw_status_repr(guc_fw->fetch_status),
intel_uc_fw_status_repr(guc_fw->load_status));

- err = i915_guc_submission_init(dev_priv);
- if (err)
- goto fail;
-
/*
* WaEnableuKernelHeaderValidFix:skl,bxt
* For BXT, this is only upto B0 but below WA is required for later
* steppings also so this is extended as well.
*/
- /* WaEnableGuCBootHashCheckNotSet:skl,bxt */
- for (retries = 3; ; ) {
- /*
- * Always reset the GuC just before (re)loading, so
- * that the state and timing are fairly predictable
- */
- err = guc_hw_reset(dev_priv);
- if (err)
- goto fail;
+ ret = guc_ucode_xfer(dev_priv);

- intel_huc_init_hw(dev_priv);
- err = guc_ucode_xfer(dev_priv);
- if (!err)
- break;
-
- if (--retries == 0)
- goto fail;
-
- DRM_INFO("GuC fw load failed: %d; will reset and "
- "retry %d more time(s)\n", err, retries);
- }
+ if (ret)
+ return -EAGAIN;

guc_fw->load_status = INTEL_UC_FIRMWARE_SUCCESS;

- intel_guc_auth_huc(dev_priv);
-
- if (i915.enable_guc_submission) {
- if (i915.guc_log_level >= 0)
- gen9_enable_guc_interrupts(dev_priv);
-
- err = i915_guc_submission_enable(dev_priv);
- if (err)
- goto fail;
- guc_interrupts_capture(dev_priv);
- }
-
DRM_INFO("GuC %s (firmware %s [version %u.%u])\n",
i915.enable_guc_submission ? "submission enabled" : "loaded",
guc_fw->path,
guc_fw->major_ver_found, guc_fw->minor_ver_found);

return 0;
-
-fail:
- if (guc_fw->load_status == INTEL_UC_FIRMWARE_PENDING)
- guc_fw->load_status = INTEL_UC_FIRMWARE_FAIL;
-
- guc_interrupts_release(dev_priv);
- i915_guc_submission_disable(dev_priv);
- i915_guc_submission_fini(dev_priv);
- i915_ggtt_disable_guc(dev_priv);
-
- /*
- * 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) {
- ret = -EIO;
- } else if (i915.enable_guc_submission > 1) {
- ret = -EIO;
- } else {
- ret = 0;
- }
-
- if (err == 0 && !HAS_GUC_UCODE(dev_priv))
- ; /* Don't mention the GuC! */
- else if (err == 0)
- DRM_INFO("GuC firmware load skipped\n");
- else if (ret != -EIO)
- DRM_NOTE("GuC firmware load failed: %d\n", err);
- else
- DRM_WARN("GuC firmware load failed: %d\n", err);
-
- if (i915.enable_guc_submission) {
- if (fw_path == NULL)
- DRM_INFO("GuC submission without firmware not supported\n");
- if (ret == 0)
- DRM_NOTE("Falling back from GuC submission to execlist mode\n");
- else
- DRM_ERROR("GuC init failed: %d\n", ret);
- }
- i915.enable_guc_submission = 0;
-
- return ret;
}

@@ -644,7 +532,7 @@ void intel_guc_fini(struct drm_i915_private *dev_priv)
struct drm_i915_gem_object *obj;

mutex_lock(&dev_priv->drm.struct_mutex);
- guc_interrupts_release(dev_priv);
+ intel_guc_interrupts_release(dev_priv);
i915_guc_submission_disable(dev_priv);
i915_guc_submission_fini(dev_priv);
mutex_unlock(&dev_priv->drm.struct_mutex);
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index ef9dc72..2bb49b7 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -29,6 +29,25 @@
static void uc_fetch_fw(struct drm_i915_private *dev_priv,
struct intel_uc_fw *uc_fw);

+static int guc_hw_reset(struct drm_i915_private *dev_priv)
+{
+ int ret;
+ u32 guc_status;
+
+ ret = intel_guc_reset(dev_priv);
+ if (ret) {
+ DRM_ERROR("GuC reset failed, ret = %d\n", ret);
+ return ret;
+ }
+
+ guc_status = I915_READ(GUC_STATUS);
+ WARN(!(guc_status & GS_MIA_IN_RESET),
+ "GuC status: 0x%x, MIA core expected to be in reset\n",
+ guc_status);
+
+ return ret;
+}
+
void intel_uc_sanitize_params(struct drm_i915_private *dev_priv)
{
if (!HAS_GUC(dev_priv)) {
@@ -68,6 +87,92 @@ void intel_fetch_uc_fw(struct drm_i915_private *dev_priv)
intel_guc_fetch_fw(&dev_priv->guc);
}

+int intel_uc_init_hw(struct drm_i915_private *dev_priv)
+{
+ int ret, retries;
+
+ /* guc not enabled, nothing to do */
+ if (!i915.enable_guc_loading)
+ return 0;
+
+ intel_guc_interrupts_release(dev_priv);
+ gen9_reset_guc_interrupts(dev_priv);
+
+ /* We need to notify the guc whenever we change the GGTT */
+ i915_ggtt_enable_guc(dev_priv);
+
+ if (i915.enable_guc_submission) {
+ ret = i915_guc_submission_init(dev_priv);
+ if (ret)
+ goto fail;
+ }
+
+ /* WaEnableGuCBootHashCheckNotSet:skl,bxt */
+ retries = GUC_WA_HASH_CHECK_NOT_SET_ATTEMPTS;
+ while (retries--) {
+ /*
+ * Always reset the GuC just before (re)loading, so
+ * that the state and timing are fairly predictable
+ */
+ ret = guc_hw_reset(dev_priv);
+ if (ret)
+ goto fail;
+
+ intel_huc_init_hw(dev_priv);
+ ret = intel_guc_init_hw(dev_priv);
+ if (ret == 0 || ret != -EAGAIN)
+ break;
+
+ DRM_INFO("GuC fw load failed: %d; will reset and "
+ "retry %d more time(s)\n", ret, retries);
+ }
+
+ /* did we succeded or run out of retries? */
+ if (ret)
+ goto fail;
+
+ intel_guc_auth_huc(dev_priv);
+ if (i915.enable_guc_submission) {
+ if (i915.guc_log_level >= 0)
+ gen9_enable_guc_interrupts(dev_priv);
+
+ ret = i915_guc_submission_enable(dev_priv);
+ if (ret)
+ goto fail;
+ intel_guc_interrupts_capture(dev_priv);
+ }
+
+ return 0;
+
+fail:
+ /*
+ * 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).
+ */
+ DRM_ERROR("GuC init failed\n");
+ if (i915.enable_guc_loading > 1 || i915.enable_guc_submission > 1)
+ ret = -EIO;
+ else
+ ret = 0;
+
+ if (i915.enable_guc_submission) {
+ i915.enable_guc_submission = 0;
+ DRM_NOTE("Falling back from GuC submission to execlist mode\n");
+ }
+
+ i915_ggtt_disable_guc(dev_priv);
+ intel_guc_interrupts_release(dev_priv);
+ i915_guc_submission_disable(dev_priv);
+ i915_guc_submission_fini(dev_priv);
+
+ return ret;
+}
+
/*
* Read GuC command/status register (SOFT_SCRATCH_0)
* Return true if it contains a response rather than a command
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index 36653f3..99402c3 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -29,6 +29,8 @@
#include "intel_ringbuffer.h"

#include "i915_vma.h"
+/* WaEnableGuCBootHashCheckNotSet:skl,bxt */
+#define GUC_WA_HASH_CHECK_NOT_SET_ATTEMPTS 3

struct drm_i915_gem_request;

@@ -189,6 +191,7 @@ struct intel_huc {
void intel_uc_sanitize_params(struct drm_i915_private *dev_priv);
void intel_uc_init_early(struct drm_i915_private *dev_priv);
void intel_fetch_uc_fw(struct drm_i915_private *dev_priv);
+int intel_uc_init_hw(struct drm_i915_private *dev_priv);
int intel_guc_send(struct intel_guc *guc, const u32 *action, u32 len);
int intel_guc_sample_forcewake(struct intel_guc *guc);

@@ -199,6 +202,8 @@ void intel_guc_fini(struct drm_i915_private *dev_priv);
const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status);
int intel_guc_suspend(struct drm_i915_private *dev_priv);
int intel_guc_resume(struct drm_i915_private *dev_priv);
+void intel_guc_interrupts_release(struct drm_i915_private *dev_priv);
+void intel_guc_interrupts_capture(struct drm_i915_private *dev_priv);
u32 intel_guc_wopcm_size(struct drm_i915_private *dev_priv);

/* i915_guc_submission.c */
--
2.9.3