drm/xe/pxp: do not queue unneeded terminations from debugfs

The PXP terminate debugfs currently unconditionally simulates a
termination, no matter what the HW status is. This is unneeded if PXP is
not in use and can cause errors if the HW init hasn't completed yet.
To solve these issues, we can simply limit the terminations to the cases
where PXP is fully initialized and in use.

v2: s/pxp_status/ready/ to avoid confusion with pxp->status (John)

Fixes: 385a8015b214 ("drm/xe/pxp: Add PXP debugfs support")
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/4749
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://lore.kernel.org/r/20250416201622.1295369-1-daniele.ceraolospurio@intel.com
(cherry picked from commit ba1f62a0cac84757ca35f4217e3cd3a2654233ae)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_pxp_debugfs.c b/drivers/gpu/drm/xe/xe_pxp_debugfs.c
index ccfbacf..525a2f6 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pxp_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_pxp_debugfs.c
@@ -66,9 +66,18 @@ static int pxp_terminate(struct seq_file *m, void *data)
 {
        struct xe_pxp *pxp = node_to_pxp(m->private);
        struct drm_printer p = drm_seq_file_printer(m);
+       int ready = xe_pxp_get_readiness_status(pxp);
 
-       if (!xe_pxp_is_enabled(pxp))
-               return -ENODEV;
+       if (ready < 0)
+               return ready; /* disabled or error occurred */
+       else if (!ready)
+               return -EBUSY; /* init still in progress */
+
+       /* no need for a termination if PXP is not active */
+       if (pxp->status != XE_PXP_ACTIVE) {
+               drm_printf(&p, "PXP not active\n");
+               return 0;
+       }
 
        /* simulate a termination interrupt */
        spin_lock_irq(&pxp->xe->irq.lock);