drm/xe/gsc: Update handling of xe_force_wake_get return

xe_force_wake_get() now returns the reference count-incremented domain
mask. If it fails for individual domains, the return value will always
be 0. However, for XE_FORCEWAKE_ALL, it may return a non-zero value even
in the event of failure. Update the return handling of xe_force_wake_get()
to reflect this behavior, and ensure that the return value is passed as
input to xe_force_wake_put().

v3
- return xe_wakeref_t instead of int in xe_force_wake_get()

v5
- return unsigned int for xe_force_wake_get()
- No need to WARN from caller in case of forcewake get failure.

v7
- Fix commit message

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Reviewed-by: Badal Nilawar <badal.nilawar@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241014075601.2324382-9-himal.prasad.ghimiray@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Author: hghimira

drivers/gpu/drm/xe/xe_gsc.c

@@ -261,19 +261,17 @@ static int gsc_upload_and_init(struct xe_gsc *gsc)
 {
 	struct xe_gt *gt = gsc_to_gt(gsc);
 	struct xe_tile *tile = gt_to_tile(gt);
+	unsigned int fw_ref;
 	int ret;
 
 	if (XE_WA(tile->primary_gt, 14018094691)) {
-		ret = xe_force_wake_get(gt_to_fw(tile->primary_gt), XE_FORCEWAKE_ALL);
+		fw_ref = xe_force_wake_get(gt_to_fw(tile->primary_gt), XE_FORCEWAKE_ALL);
 
 		/*
 		 * If the forcewake fails we want to keep going, because the worst
 		 * case outcome in failing to apply the WA is that PXP won't work,
-		 * which is not fatal. We still throw a warning so the issue is
-		 * seen if it happens.
+		 * which is not fatal. Forcewake get warns implicitly in case of failure
 		 */
-		xe_gt_WARN_ON(tile->primary_gt, ret);
-
 		xe_gt_mcr_multicast_write(tile->primary_gt,
 					  EU_SYSTOLIC_LIC_THROTTLE_CTL_WITH_LOCK,
 					  EU_SYSTOLIC_LIC_THROTTLE_CTL_LOCK_BIT);
@@ -282,7 +280,7 @@ static int gsc_upload_and_init(struct xe_gsc *gsc)
 	ret = gsc_upload(gsc);
 
 	if (XE_WA(tile->primary_gt, 14018094691))
-		xe_force_wake_put(gt_to_fw(tile->primary_gt), XE_FORCEWAKE_ALL);
+		xe_force_wake_put(gt_to_fw(tile->primary_gt), fw_ref);
 
 	if (ret)
 		return ret;
@@ -352,6 +350,7 @@ static void gsc_work(struct work_struct *work)
 	struct xe_gsc *gsc = container_of(work, typeof(*gsc), work);
 	struct xe_gt *gt = gsc_to_gt(gsc);
 	struct xe_device *xe = gt_to_xe(gt);
+	unsigned int fw_ref;
 	u32 actions;
 	int ret;
 
@@ -361,7 +360,7 @@ static void gsc_work(struct work_struct *work)
 	spin_unlock_irq(&gsc->lock);
 
 	xe_pm_runtime_get(xe);
-	xe_gt_WARN_ON(gt, xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC));
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
 
 	if (actions & GSC_ACTION_ER_COMPLETE) {
 		ret = gsc_er_complete(gt);
@@ -381,7 +380,7 @@ static void gsc_work(struct work_struct *work)
 		xe_gsc_proxy_request_handler(gsc);
 
 out:
-	xe_force_wake_put(gt_to_fw(gt), XE_FW_GSC);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_pm_runtime_put(xe);
 }
 
@@ -601,7 +600,7 @@ void xe_gsc_print_info(struct xe_gsc *gsc, struct drm_printer *p)
 {
 	struct xe_gt *gt = gsc_to_gt(gsc);
 	struct xe_mmio *mmio = &gt->mmio;
-	int err;
+	unsigned int fw_ref;
 
 	xe_uc_fw_print(&gsc->fw, p);
 
@@ -610,8 +609,8 @@ void xe_gsc_print_info(struct xe_gsc *gsc, struct drm_printer *p)
 	if (!xe_uc_fw_is_enabled(&gsc->fw))
 		return;
 
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
-	if (err)
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
+	if (!fw_ref)
 		return;
 
 	drm_printf(p, "\nHECI1 FWSTS: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
@@ -622,5 +621,5 @@ void xe_gsc_print_info(struct xe_gsc *gsc, struct drm_printer *p)
 			xe_mmio_read32(mmio, HECI_FWSTS5(MTL_GSC_HECI1_BASE)),
 			xe_mmio_read32(mmio, HECI_FWSTS6(MTL_GSC_HECI1_BASE)));
 
-	xe_force_wake_put(gt_to_fw(gt), XE_FW_GSC);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 }

drivers/gpu/drm/xe/xe_gsc_proxy.c

@@ -450,22 +450,21 @@ void xe_gsc_proxy_remove(struct xe_gsc *gsc)
 {
 	struct xe_gt *gt = gsc_to_gt(gsc);
 	struct xe_device *xe = gt_to_xe(gt);
-	int err = 0;
+	unsigned int fw_ref = 0;
 
 	if (!gsc->proxy.component_added)
 		return;
 
 	/* disable HECI2 IRQs */
 	xe_pm_runtime_get(xe);
-	err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
-	if (err)
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
+	if (!fw_ref)
 		xe_gt_err(gt, "failed to get forcewake to disable GSC interrupts\n");
 
 	/* try do disable irq even if forcewake failed */
 	gsc_proxy_irq_toggle(gsc, false);
 
-	if (!err)
-		xe_force_wake_put(gt_to_fw(gt), XE_FW_GSC);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_pm_runtime_put(xe);
 
 	xe_gsc_wait_for_worker_completion(gsc);