[PATCH v2 2/4] drm/xe/vf: Send RESFIX_DONE message at end of VF restore

[Tomasz Lis <tomasz.lis@intel.com>]

After restore, GuC will not answer to any messages from VF KMD until
fixups are applied. When that is done, VF KMD sends RESFIX_DONE
message to GuC, at which point GuC resumes normal operation.

This patch implements sending the RESFIX_DONE message at end of
post-migration recovery.

v2: keep pm ref during whole recovery, style fixes (mwajdeczko)

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
---
 .../gpu/drm/xe/abi/guc_actions_sriov_abi.h    | 38 +++++++++++++++++++
 drivers/gpu/drm/xe/xe_gt_sriov_vf.c           | 36 ++++++++++++++++++
 drivers/gpu/drm/xe/xe_gt_sriov_vf.h           |  1 +
 drivers/gpu/drm/xe/xe_sriov_vf.c              | 23 +++++++++++
 4 files changed, 98 insertions(+)

diff --git a/drivers/gpu/drm/xe/abi/guc_actions_sriov_abi.h b/drivers/gpu/drm/xe/abi/guc_actions_sriov_abi.h
index b6a1852749dd..0b28659d94e9 100644
--- a/drivers/gpu/drm/xe/abi/guc_actions_sriov_abi.h
+++ b/drivers/gpu/drm/xe/abi/guc_actions_sriov_abi.h
@@ -501,6 +501,44 @@
 #define VF2GUC_VF_RESET_RESPONSE_MSG_LEN		GUC_HXG_RESPONSE_MSG_MIN_LEN
 #define VF2GUC_VF_RESET_RESPONSE_MSG_0_MBZ		GUC_HXG_RESPONSE_MSG_0_DATA0
 
+/**
+ * DOC: VF2GUC_NOTIFY_RESFIX_DONE
+ *
+ * This action is used by VF to notify the GuC that the VF KMD has completed
+ * post-migration recovery steps.
+ *
+ * This message must be sent as `MMIO HXG Message`_.
+ *
+ *  +---+-------+--------------------------------------------------------------+
+ *  |   | Bits  | Description                                                  |
+ *  +===+=======+==============================================================+
+ *  | 0 |    31 | ORIGIN = GUC_HXG_ORIGIN_HOST_                                |
+ *  |   +-------+--------------------------------------------------------------+
+ *  |   | 30:28 | TYPE = GUC_HXG_TYPE_REQUEST_                                 |
+ *  |   +-------+--------------------------------------------------------------+
+ *  |   | 27:16 | DATA0 = MBZ                                                  |
+ *  |   +-------+--------------------------------------------------------------+
+ *  |   |  15:0 | ACTION = _`GUC_ACTION_VF2GUC_NOTIFY_RESFIX_DONE` = 0x5508    |
+ *  +---+-------+--------------------------------------------------------------+
+ *
+ *  +---+-------+--------------------------------------------------------------+
+ *  |   | Bits  | Description                                                  |
+ *  +===+=======+==============================================================+
+ *  | 0 |    31 | ORIGIN = GUC_HXG_ORIGIN_GUC_                                 |
+ *  |   +-------+--------------------------------------------------------------+
+ *  |   | 30:28 | TYPE = GUC_HXG_TYPE_RESPONSE_SUCCESS_                        |
+ *  |   +-------+--------------------------------------------------------------+
+ *  |   |  27:0 | DATA0 = MBZ                                                  |
+ *  +---+-------+--------------------------------------------------------------+
+ */
+#define GUC_ACTION_VF2GUC_NOTIFY_RESFIX_DONE		0x5508u
+
+#define VF2GUC_NOTIFY_RESFIX_DONE_REQUEST_MSG_LEN	GUC_HXG_REQUEST_MSG_MIN_LEN
+#define VF2GUC_NOTIFY_RESFIX_DONE_REQUEST_MSG_0_MBZ	GUC_HXG_REQUEST_MSG_0_DATA0
+
+#define VF2GUC_NOTIFY_RESFIX_DONE_RESPONSE_MSG_LEN	GUC_HXG_RESPONSE_MSG_MIN_LEN
+#define VF2GUC_NOTIFY_RESFIX_DONE_RESPONSE_MSG_0_MBZ	GUC_HXG_RESPONSE_MSG_0_DATA0
+
 /**
  * DOC: VF2GUC_QUERY_SINGLE_KLV
  *
diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
index 489ace57c2a1..6f7a1c92d541 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
@@ -224,6 +224,42 @@ int xe_gt_sriov_vf_bootstrap(struct xe_gt *gt)
 	return 0;
 }
 
+static int guc_action_vf_notify_resfix_done(struct xe_guc *guc)
+{
+	u32 request[GUC_HXG_REQUEST_MSG_MIN_LEN] = {
+		FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) |
+		FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) |
+		FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, GUC_ACTION_VF2GUC_NOTIFY_RESFIX_DONE),
+	};
+	int ret;
+
+	ret = xe_guc_mmio_send(guc, request, ARRAY_SIZE(request));
+
+	return ret > 0 ? -EPROTO : ret;
+}
+
+/**
+ * xe_gt_sriov_vf_notify_resfix_done - Notify GuC about resource fixups apply completed.
+ * @gt: the &xe_gt struct instance linked to target GuC
+ *
+ * Returns: 0 if the operation completed successfully, or a negative error
+ * code otherwise.
+ */
+int xe_gt_sriov_vf_notify_resfix_done(struct xe_gt *gt)
+{
+	struct xe_guc *guc = &gt->uc.guc;
+	int err;
+
+	xe_gt_assert(gt, IS_SRIOV_VF(gt_to_xe(gt)));
+
+	err = guc_action_vf_notify_resfix_done(guc);
+	if (unlikely(err))
+		xe_gt_sriov_err(gt, "Failed to notify GuC about resource fixup done (%pe)\n",
+				ERR_PTR(err));
+
+	return err;
+}
+
 static int guc_action_query_single_klv(struct xe_guc *guc, u32 key,
 				       u32 *value, u32 value_len)
 {
diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
index 544e913b8465..b62432271a6d 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.h
@@ -17,6 +17,7 @@ int xe_gt_sriov_vf_query_config(struct xe_gt *gt);
 int xe_gt_sriov_vf_connect(struct xe_gt *gt);
 int xe_gt_sriov_vf_query_runtime(struct xe_gt *gt);
 int xe_gt_sriov_vf_prepare_ggtt(struct xe_gt *gt);
+int xe_gt_sriov_vf_notify_resfix_done(struct xe_gt *gt);
 
 void xe_gt_sriov_vf_migrated_event_handler(struct xe_gt *gt);
 
diff --git a/drivers/gpu/drm/xe/xe_sriov_vf.c b/drivers/gpu/drm/xe/xe_sriov_vf.c
index 0e332bb215fd..d0c5a0b7e170 100644
--- a/drivers/gpu/drm/xe/xe_sriov_vf.c
+++ b/drivers/gpu/drm/xe/xe_sriov_vf.c
@@ -7,6 +7,8 @@
 
 #include "xe_assert.h"
 #include "xe_device.h"
+#include "xe_gt_sriov_vf.h"
+#include "xe_pm.h"
 #include "xe_sriov.h"
 #include "xe_sriov_vf.h"
 #include "xe_sriov_printk.h"
@@ -22,10 +24,31 @@ void xe_sriov_vf_init_early(struct xe_device *xe)
 	INIT_WORK(&xe->sriov.vf.migration.worker, migration_worker_func);
 }
 
+/*
+ * vf_post_migration_notify_resfix_done - Notify all GuCs about resource fixups apply finished.
+ * @xe: the &xe_device struct instance
+ */
+static void vf_post_migration_notify_resfix_done(struct xe_device *xe)
+{
+	struct xe_gt *gt;
+	unsigned int id;
+	int err, num_sent = 0;
+
+	for_each_gt(gt, xe, id) {
+		err = xe_gt_sriov_vf_notify_resfix_done(gt);
+		if (!err)
+			num_sent++;
+	}
+	drm_dbg(&xe->drm, "sent %d VF resource fixups done notifications\n", num_sent);
+}
+
 static void vf_post_migration_recovery(struct xe_device *xe)
 {
 	drm_dbg(&xe->drm, "migration recovery in progress\n");
+	xe_pm_runtime_get(xe);
 	/* FIXME: add the recovery steps */
+	vf_post_migration_notify_resfix_done(xe);
+	xe_pm_runtime_put(xe);
 	drm_notice(&xe->drm, "migration recovery ended\n");
 }
 
-- 
2.25.1