[PATCH 6/6] drm/xe: Introduce the busted_mode debugfs

[Rodrigo Vivi]

So, the busted mode can be selected at runtime with the device
granularity, rather then a module policy.

Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/xe/xe_debugfs.c | 12 +++++++++
 drivers/gpu/drm/xe/xe_guc_ads.c | 46 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_guc_ads.h |  1 +
 3 files changed, 59 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index 175ba306c3eb..0cd20862d32e 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -12,6 +12,7 @@
 #include "xe_bo.h"
 #include "xe_device.h"
 #include "xe_gt_debugfs.h"
+#include "xe_guc_ads.h"
 #include "xe_pm.h"
 #include "xe_step.h"
 
@@ -124,8 +125,10 @@ static ssize_t busted_mode_set(struct file *f, const char __user *ubuf,
 			       size_t size, loff_t *pos)
 {
 	struct xe_device *xe = file_inode(f)->i_private;
+	struct xe_gt *gt;
 	u32 busted_mode;
 	ssize_t ret;
+	u8 id;
 
 	ret = kstrtouint_from_user(ubuf, size, 0, &busted_mode);
 	if (ret)
@@ -136,6 +139,15 @@ static ssize_t busted_mode_set(struct file *f, const char __user *ubuf,
 
 	mutex_lock(&xe->busted.lock);
 	xe->busted.mode = busted_mode;
+	if (busted_mode == 2) {
+		for_each_gt(gt, xe, id) {
+			ret = xe_guc_ads_scheduler_policy_disable_reset(&gt->uc.guc.ads);
+			if (ret) {
+				drm_err(&xe->drm, "Failed to update GuC ADS scheduler policy. GPU might still reset even on the busted_mode=2\n");
+				break;
+			}
+		}
+	}
 	mutex_unlock(&xe->busted.lock);
 
 	return size;
diff --git a/drivers/gpu/drm/xe/xe_guc_ads.c b/drivers/gpu/drm/xe/xe_guc_ads.c
index 43f0a88bbe8a..5dccdbe595bf 100644
--- a/drivers/gpu/drm/xe/xe_guc_ads.c
+++ b/drivers/gpu/drm/xe/xe_guc_ads.c
@@ -7,6 +7,7 @@
 
 #include <drm/drm_managed.h>
 
+#include "abi/guc_actions_abi.h"
 #include "regs/xe_engine_regs.h"
 #include "regs/xe_gt_regs.h"
 #include "regs/xe_guc_regs.h"
@@ -14,6 +15,7 @@
 #include "xe_gt.h"
 #include "xe_gt_ccs_mode.h"
 #include "xe_guc.h"
+#include "xe_guc_ct.h"
 #include "xe_hw_engine.h"
 #include "xe_lrc.h"
 #include "xe_map.h"
@@ -679,3 +681,47 @@ void xe_guc_ads_populate_post_load(struct xe_guc_ads *ads)
 {
 	guc_populate_golden_lrc(ads);
 }
+
+static int guc_ads_action_update_policies(struct xe_guc_ads *ads, u32 policy_offset)
+{
+	struct  xe_guc_ct *ct = &ads_to_guc(ads)->ct;
+	u32 action[] = {
+		XE_GUC_ACTION_GLOBAL_SCHED_POLICY_CHANGE,
+		policy_offset
+	};
+
+	return xe_guc_ct_send(ct, action, ARRAY_SIZE(action), 0, 0);
+}
+
+int xe_guc_ads_scheduler_policy_disable_reset(struct xe_guc_ads *ads)
+{
+	struct xe_device *xe = ads_to_xe(ads);
+	struct xe_gt *gt = ads_to_gt(ads);
+	struct xe_tile *tile = gt_to_tile(gt);
+	struct guc_policies *policies;
+	struct xe_bo *bo;
+	int ret = 0;
+
+	policies = kmalloc(sizeof(*policies), GFP_KERNEL);
+	if (!policies)
+		return -ENOMEM;
+
+	policies->dpc_promote_time = ads_blob_read(ads, policies.dpc_promote_time);
+	policies->max_num_work_items = ads_blob_read(ads, policies.max_num_work_items);
+	policies->is_valid = 1;
+	if (xe->busted.mode == 2)
+		policies->global_flags |= GLOBAL_POLICY_DISABLE_ENGINE_RESET;
+
+	bo = xe_managed_bo_create_from_data(xe, tile, policies, sizeof(struct guc_policies),
+					    XE_BO_CREATE_VRAM_IF_DGFX(tile) |
+					    XE_BO_CREATE_GGTT_BIT);
+	if (IS_ERR(bo)) {
+		ret = PTR_ERR(bo);
+		goto out;
+	}
+
+	ret = guc_ads_action_update_policies(ads, xe_bo_ggtt_addr(bo));
+out:
+	kfree(policies);
+	return ret;
+}
diff --git a/drivers/gpu/drm/xe/xe_guc_ads.h b/drivers/gpu/drm/xe/xe_guc_ads.h
index 138ef6267671..7c45c40fab34 100644
--- a/drivers/gpu/drm/xe/xe_guc_ads.h
+++ b/drivers/gpu/drm/xe/xe_guc_ads.h
@@ -13,5 +13,6 @@ int xe_guc_ads_init_post_hwconfig(struct xe_guc_ads *ads);
 void xe_guc_ads_populate(struct xe_guc_ads *ads);
 void xe_guc_ads_populate_minimal(struct xe_guc_ads *ads);
 void xe_guc_ads_populate_post_load(struct xe_guc_ads *ads);
+int xe_guc_ads_scheduler_policy_disable_reset(struct xe_guc_ads *ads);
 
 #endif
-- 
2.44.0