From d48b276acd8a87baa93033de40d014ae053ae481 Mon Sep 17 00:00:00 2001
From: "Juan A. Suarez Romero" <jasuarez@igalia.com>
Date: Fri, 24 Oct 2025 13:56:16 +0200
Subject: [PATCH] broadcom/simulator: add helper to get stride alignment

Some GPUs, like AMD, has specific stride align requirements in order to
display the content correctly.

Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Signed-off-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37887>
---
 src/broadcom/simulator/v3d_simulator.c | 16 ++++++++++++++++
 src/broadcom/simulator/v3d_simulator.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/src/broadcom/simulator/v3d_simulator.c b/src/broadcom/simulator/v3d_simulator.c
index 2f4f0256dc1..1de455d5b4a 100644
--- a/src/broadcom/simulator/v3d_simulator.c
+++ b/src/broadcom/simulator/v3d_simulator.c
@@ -123,6 +123,9 @@ struct v3d_simulator_file {
 
         /** For specific gpus, use their create ioctl. Otherwise use dumb bo. */
         enum gem_type gem_type;
+
+        /** The stride alignment required for raster textures. */
+        uint32_t raster_stride_align;
 };
 
 /** Wrapper for drm_v3d_bo tracking the simulator-specific state. */
@@ -1161,6 +1164,13 @@ v3d_simulator_get_mem_free(void)
    return total_free;
 }
 
+uint32_t
+v3d_simulator_get_raster_stride_align(int fd)
+{
+        struct v3d_simulator_file *file = v3d_get_simulator_file_for_fd(fd);
+        return file->raster_stride_align;
+}
+
 static void
 v3d_simulator_init_global()
 {
@@ -1218,6 +1228,12 @@ v3d_simulator_init(int fd)
                 sim_file->gem_type = GEM_ASAHI;
         else
                 sim_file->gem_type = GEM_DUMB;
+
+        if (sim_file->gem_type == GEM_AMDGPU)
+                sim_file->raster_stride_align = 256;
+        else
+                sim_file->raster_stride_align = 1;
+
         drmFreeVersion(version);
 
         sim_file->bo_map =
diff --git a/src/broadcom/simulator/v3d_simulator.h b/src/broadcom/simulator/v3d_simulator.h
index 7fe055bc546..ac4974d9c6d 100644
--- a/src/broadcom/simulator/v3d_simulator.h
+++ b/src/broadcom/simulator/v3d_simulator.h
@@ -41,6 +41,7 @@ int v3d_simulator_ioctl(int fd, unsigned long request, void *arg);
 void v3d_simulator_open_from_handle(int fd, int handle, uint32_t size);
 uint32_t v3d_simulator_get_mem_size(void);
 uint32_t v3d_simulator_get_mem_free(void);
+uint32_t v3d_simulator_get_raster_stride_align(int fd);
 
 #ifdef v3dX
 #  include "v3dx_simulator.h"