Mesa (staging/22.1): intel/common: allocate space for at least one task urb

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Module: Mesa
Branch: staging/22.1
Commit: 02923d768501d596171a3ecaef0946c41aed4423
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=02923d768501d596171a3ecaef0946c41aed4423

Author: Marcin Ślusarz <marcin.slusarz at intel.com>
Date:   Fri May  6 16:37:27 2022 +0200

intel/common: allocate space for at least one task urb

Fixes: c93cbc77f78 ("intel/common: Add helper for URB allocation in Mesh pipeline")
Acked-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16196>
(cherry picked from commit 3dc6a98d78c669b28ee600b9da7086febb859e8f)

---

 .pick_status.json                   | 2 +-
 src/intel/common/intel_urb_config.c | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/.pick_status.json b/.pick_status.json
index 35719bca391..8bb44c8b8d7 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -85,7 +85,7 @@
         "description": "intel/common: allocate space for at least one task urb",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "c93cbc77f78ac4d6c479f657e6f92952fd357211"
     },
diff --git a/src/intel/common/intel_urb_config.c b/src/intel/common/intel_urb_config.c
index 2f7d72cc31f..63dc04cb829 100644
--- a/src/intel/common/intel_urb_config.c
+++ b/src/intel/common/intel_urb_config.c
@@ -338,7 +338,10 @@ intel_get_mesh_urb_config(const struct intel_device_info *devinfo,
       task_urb_share = task_urb_share_percentage / 100.0f;
    }
 
-   const unsigned task_urb_kb = ALIGN(total_urb_kb * task_urb_share, 8);
+   const unsigned one_task_urb_kb = ALIGN(r.task_entry_size_64b * 64, 1024) / 1024;
+
+   const unsigned task_urb_kb = ALIGN(MAX2(total_urb_kb * task_urb_share, one_task_urb_kb), 8);
+
    const unsigned mesh_urb_kb = total_urb_kb - task_urb_kb;
 
    /* TODO(mesh): Could we avoid allocating URB for Mesh if rasterization is