[Intel-gfx] [PATCH] drm/i915/fdinfo: Enable fdinfo for GuC backends

[Umesh Nerlige Ramappa]

The underlying mechanism used to provide the client specific utilization
in fdinfo is context busyness. When a context switches out, the HW
records the runtime in the specific context field. This information is
accumulated in fdinfo. This information is independent of the scheduling
backend as long as contexts are switching out in reasonable time.

If a context is actively running on the engine, then the active busyness
is calculated by using the delta between current time and the context
switch in time. This part of the calculation depends on the scheduling
backend. For GuC backends, this data comes entirely from GuC FW. The FW
implementation is WIP.

Enable fdinfo for GuC based platforms with the exception that long
running contexts will not provide reliable busyness data unless they
switch out at some reasonable point in time.

Revert "drm/i915: Don't show engine information in fdinfo with GuC submission"
This reverts commit 8d0e3decf26bc423d8b1c42c05636ccc05ea6b17.

Resolves: https://gitlab.freedesktop.org/drm/intel/issues/8303
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Test-with: 20230331195915.5839-1-umesh.nerlige.ramappa at intel.com
---
 drivers/gpu/drm/i915/i915_drm_client.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
index e8fa172ebe5e..d18d0a3ed905 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.c
+++ b/drivers/gpu/drm/i915/i915_drm_client.c
@@ -147,11 +147,7 @@ void i915_drm_client_fdinfo(struct seq_file *m, struct file *f)
 		   PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
 	seq_printf(m, "drm-client-id:\t%u\n", client->id);
 
-	/*
-	 * Temporarily skip showing client engine information with GuC submission till
-	 * fetching engine busyness is implemented in the GuC submission backend
-	 */
-	if (GRAPHICS_VER(i915) < 8 || intel_uc_uses_guc_submission(&i915->gt0.uc))
+	if (GRAPHICS_VER(i915) < 8)
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)
-- 
2.36.1