[PATCH v6] drm/i915/selftest/gsc: Ensure GSC Proxy init completes before selftests

[Alan Previn]

On MTL, if the GSC Proxy init flows haven't completed, submissions to the
GSC engine will fail. Those init flows are dependent on the mei's
gsc_proxy component that is loaded in parallel with i915 and a
worker that could potentially start after i915 driver init is done.

That said, all subsytems that access the GSC engine today does check
for such init flow completion before using the GSC engine. However,
selftests currently don't wait on anything before starting.

To fix this, add a waiter function at the start of __run_selftests
that waits for gsc-proxy init flows to complete. Selftests shouldn't
care if the proxy-init failed as that should be flagged elsewhere.

Difference from prior versions:
   v6: - Add a helper that returns something more than a boolean
         so we selftest can stop waiting if proxy-init hadn't
         completed but failed (Daniele).
   v5: - Move the call to __wait_gsc_proxy_completed from common
         __run_selftests dispatcher to the group-level selftest
         function (Trvtko).
       - change the pr_info to pr_warn if we hit the timeout.
   v4: - Remove generalized waiters function table framework (Tvrtko).
       - Remove mention of CI-framework-timeout from comments (Tvrtko).
   v3: - Rebase to latest drm-tip.
   v2: - Based on internal testing, increase the timeout for gsc-proxy
         specific case to 8 seconds.

Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c     | 14 +++++++++
 drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.h     |  1 +
 .../gpu/drm/i915/selftests/i915_selftest.c    | 31 +++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
index ab1a456f833d..163021705210 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
@@ -45,6 +45,20 @@ bool intel_gsc_uc_fw_proxy_init_done(struct intel_gsc_uc *gsc, bool needs_wakere
 	       HECI1_FWSTS1_PROXY_STATE_NORMAL;
 }
 
+int intel_gsc_uc_fw_proxy_get_status(struct intel_gsc_uc *gsc)
+{
+	if (!(IS_ENABLED(CONFIG_INTEL_MEI_GSC_PROXY)))
+		return -ENODEV;
+	if (!intel_uc_fw_is_loadable(&gsc->fw))
+		return -ENODEV;
+	if (__intel_uc_fw_status(&gsc->fw) == INTEL_UC_FIRMWARE_LOAD_FAIL)
+		return -ENOLINK;
+	if (!intel_gsc_uc_fw_proxy_init_done(gsc, true))
+		return -EAGAIN;
+
+	return 0;
+}
+
 bool intel_gsc_uc_fw_init_done(struct intel_gsc_uc *gsc)
 {
 	return gsc_uc_get_fw_status(gsc_uc_to_gt(gsc)->uncore, false) &
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.h b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.h
index ad2167ce9137..bc9dd0de8aaf 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.h
@@ -16,5 +16,6 @@ int intel_gsc_fw_get_binary_info(struct intel_uc_fw *gsc_fw, const void *data, s
 int intel_gsc_uc_fw_upload(struct intel_gsc_uc *gsc);
 bool intel_gsc_uc_fw_init_done(struct intel_gsc_uc *gsc);
 bool intel_gsc_uc_fw_proxy_init_done(struct intel_gsc_uc *gsc, bool needs_wakeref);
+int intel_gsc_uc_fw_proxy_get_status(struct intel_gsc_uc *gsc);
 
 #endif
diff --git a/drivers/gpu/drm/i915/selftests/i915_selftest.c b/drivers/gpu/drm/i915/selftests/i915_selftest.c
index 39da0fb0d6d2..ee79e0809a6d 100644
--- a/drivers/gpu/drm/i915/selftests/i915_selftest.c
+++ b/drivers/gpu/drm/i915/selftests/i915_selftest.c
@@ -24,6 +24,8 @@
 #include <linux/random.h>
 
 #include "gt/intel_gt_pm.h"
+#include "gt/uc/intel_gsc_fw.h"
+
 #include "i915_driver.h"
 #include "i915_drv.h"
 #include "i915_selftest.h"
@@ -127,6 +129,31 @@ static void set_default_test_all(struct selftest *st, unsigned int count)
 		st[i].enabled = true;
 }
 
+static bool
+__gsc_proxy_init_progressing(struct intel_gsc_uc *gsc)
+{
+	return intel_gsc_uc_fw_proxy_get_status(gsc) == -EAGAIN;
+}
+
+static void
+__wait_gsc_proxy_completed(struct drm_i915_private *i915)
+{
+	bool need_to_wait = (IS_ENABLED(CONFIG_INTEL_MEI_GSC_PROXY) &&
+			     i915->media_gt &&
+			     HAS_ENGINE(i915->media_gt, GSC0) &&
+			     intel_uc_fw_is_loadable(&i915->media_gt->uc.gsc.fw));
+	/*
+	 * The gsc proxy component depends on the kernel component driver load ordering
+	 * and in corner cases (the first time after an IFWI flash), init-completion
+	 * firmware flows take longer.
+	 */
+	unsigned long timeout_ms = 8000;
+
+	if (need_to_wait && wait_for(!__gsc_proxy_init_progressing(&i915->media_gt->uc.gsc),
+				     timeout_ms))
+		pr_warn(DRIVER_NAME "Timed out waiting for gsc_proxy_completion!\n");
+}
+
 static int __run_selftests(const char *name,
 			   struct selftest *st,
 			   unsigned int count,
@@ -206,6 +233,8 @@ int i915_live_selftests(struct pci_dev *pdev)
 	if (!i915_selftest.live)
 		return 0;
 
+	__wait_gsc_proxy_completed(pdev_to_i915(pdev));
+
 	err = run_selftests(live, pdev_to_i915(pdev));
 	if (err) {
 		i915_selftest.live = err;
@@ -227,6 +256,8 @@ int i915_perf_selftests(struct pci_dev *pdev)
 	if (!i915_selftest.perf)
 		return 0;
 
+	__wait_gsc_proxy_completed(pdev_to_i915(pdev));
+
 	err = run_selftests(perf, pdev_to_i915(pdev));
 	if (err) {
 		i915_selftest.perf = err;

base-commit: cc69df372f21eb3073c062132ee9eb3649605931
-- 
2.39.0