diff mbox series

[v5] drm/i915/selftest/gsc: Ensure GSC Proxy init completes before selftests

Message ID 20230712231243.2459135-1-alan.previn.teres.alexis@intel.com (mailing list archive)
State New, archived
Headers show
Series [v5] drm/i915/selftest/gsc: Ensure GSC Proxy init completes before selftests | expand

Commit Message

Teres Alexis, Alan Previn July 12, 2023, 11:12 p.m. UTC 
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.

Difference from prior versions:
   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@intel.com>
---
 .../gpu/drm/i915/selftests/i915_selftest.c    | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)


base-commit: 57ea1a97c50c63c77e3bfa46ee486e8a451be5e7

Comments

Daniele Ceraolo Spurio July 20, 2023, 8:52 p.m. UTC | #1 
On 7/12/2023 4:12 PM, Alan Previn wrote:
> 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.
>
> Difference from prior versions:
>     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@intel.com>
> ---
>   .../gpu/drm/i915/selftests/i915_selftest.c    | 26 +++++++++++++++++++
>   1 file changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/selftests/i915_selftest.c b/drivers/gpu/drm/i915/selftests/i915_selftest.c
> index 39da0fb0d6d2..b03d03eac3d6 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 +129,26 @@ static void set_default_test_all(struct selftest *st, unsigned int count)
>   		st[i].enabled = true;
>   }
>   
> +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(intel_gsc_uc_fw_proxy_init_done(&i915->media_gt->uc.gsc, true),

Small issue here: if proxy init fails, intel_gsc_uc_fw_proxy_init_done 
will keep returning false, so we'll wait for the full 8 secs. Maybe we 
can instead have a proxy_init_status function to differentiate between 
pending/failed/done. This would basically be a generalization of the 
checks you already have in https://patchwork.freedesktop.org/series/118723/.
Patch LGTM apart from this.

Daniele

> +	    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 +228,8 @@ 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 +251,8 @@ 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: 57ea1a97c50c63c77e3bfa46ee486e8a451be5e7
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/selftests/i915_selftest.c b/drivers/gpu/drm/i915/selftests/i915_selftest.c
index 39da0fb0d6d2..b03d03eac3d6 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 +129,26 @@  static void set_default_test_all(struct selftest *st, unsigned int count)
 		st[i].enabled = true;
 }
 
+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(intel_gsc_uc_fw_proxy_init_done(&i915->media_gt->uc.gsc, true),
+	    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 +228,8 @@  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 +251,8 @@  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;