[PATCH 1/3] drm/xe/pf: Use GuC Buffer Cache during policy provisioning

[Michal Wajdeczko]

Start using GuC buffer cache for the SRIOV policy configuration
actions. This is a required step before we could declare SRIOV
PF as being a reclaim safe.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
 drivers/gpu/drm/xe/xe_gt_sriov_pf_policy.c | 50 +++++++++++-----------
 1 file changed, 24 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_policy.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_policy.c
index c00fb354705f..4445f660e6d1 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_policy.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_policy.c
@@ -10,6 +10,7 @@
 #include "xe_gt_sriov_pf_helpers.h"
 #include "xe_gt_sriov_pf_policy.h"
 #include "xe_gt_sriov_printk.h"
+#include "xe_guc_buf.h"
 #include "xe_guc_ct.h"
 #include "xe_guc_klv_helpers.h"
 #include "xe_pm.h"
@@ -34,48 +35,28 @@ static int guc_action_update_vgt_policy(struct xe_guc *guc, u64 addr, u32 size)
  * Return: number of KLVs that were successfully parsed and saved,
  *         negative error code on failure.
  */
-static int pf_send_policy_klvs(struct xe_gt *gt, const u32 *klvs, u32 num_dwords)
+static int pf_send_policy_klvs(struct xe_gt *gt, struct xe_guc_buf buf, u32 num_dwords)
 {
-	const u32 bytes = num_dwords * sizeof(u32);
-	struct xe_tile *tile = gt_to_tile(gt);
-	struct xe_device *xe = tile_to_xe(tile);
 	struct xe_guc *guc = &gt->uc.guc;
-	struct xe_bo *bo;
-	int ret;
 
-	bo = xe_bo_create_pin_map(xe, tile, NULL,
-				  ALIGN(bytes, PAGE_SIZE),
-				  ttm_bo_type_kernel,
-				  XE_BO_FLAG_VRAM_IF_DGFX(tile) |
-				  XE_BO_FLAG_GGTT);
-	if (IS_ERR(bo))
-		return PTR_ERR(bo);
-
-	xe_map_memcpy_to(xe, &bo->vmap, 0, klvs, bytes);
-
-	ret = guc_action_update_vgt_policy(guc, xe_bo_ggtt_addr(bo), num_dwords);
-
-	xe_bo_unpin_map_no_vm(bo);
-
-	return ret;
+	return guc_action_update_vgt_policy(guc, xe_guc_buf_flush(buf), num_dwords);
 }
 
 /*
  * Return: 0 on success, -ENOKEY if some KLVs were not updated, -EPROTO if reply was malformed,
  *         negative error code on failure.
  */
-static int pf_push_policy_klvs(struct xe_gt *gt, u32 num_klvs,
-			       const u32 *klvs, u32 num_dwords)
+static int pf_push_policy_buf_klvs(struct xe_gt *gt, u32 num_klvs,
+				   struct xe_guc_buf buf, u32 num_dwords)
 {
 	int ret;
 
-	xe_gt_assert(gt, num_klvs == xe_guc_klv_count(klvs, num_dwords));
-
-	ret = pf_send_policy_klvs(gt, klvs, num_dwords);
+	ret = pf_send_policy_klvs(gt, buf, num_dwords);
 
 	if (ret != num_klvs) {
 		int err = ret < 0 ? ret : ret < num_klvs ? -ENOKEY : -EPROTO;
 		struct drm_printer p = xe_gt_info_printer(gt);
+		void *klvs = xe_guc_buf_cpu_ptr(buf);
 
 		xe_gt_sriov_notice(gt, "Failed to push %u policy KLV%s (%pe)\n",
 				   num_klvs, str_plural(num_klvs), ERR_PTR(err));
@@ -86,6 +67,23 @@ static int pf_push_policy_klvs(struct xe_gt *gt, u32 num_klvs,
 	return 0;
 }
 
+/*
+ * Return: 0 on success, -ENOBUFS if there is no free buffer for the indirect data,
+ *         negative error code on failure.
+ */
+static int pf_push_policy_klvs(struct xe_gt *gt, u32 num_klvs,
+			       const u32 *klvs, u32 num_dwords)
+{
+	CLASS(xe_guc_buf_from_data, buf)(&gt->uc.guc.buf, klvs, num_dwords * sizeof(u32));
+
+	xe_gt_assert(gt, num_klvs == xe_guc_klv_count(klvs, num_dwords));
+
+	if (!xe_guc_buf_is_valid(buf))
+		return -ENOBUFS;
+
+	return pf_push_policy_buf_klvs(gt, num_klvs, buf, num_dwords);
+}
+
 static int pf_push_policy_u32(struct xe_gt *gt, u16 key, u32 value)
 {
 	u32 klv[] = {
-- 
2.47.1