panvk: Constify the shader pointers in the graphics state

The command buffer logic is not supposed to modify these objects.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29451>

src/panfrost/vulkan/jm/panvk_cmd_buffer.h

@@ -96,7 +96,7 @@ struct panvk_cmd_graphics_state {
    bool linked;
 
    struct {
-      struct panvk_shader *shader;
+      const struct panvk_shader *shader;
       mali_ptr rsd;
 #if PAN_ARCH <= 7
       struct panvk_shader_desc_state desc;
@@ -104,7 +104,7 @@ struct panvk_cmd_graphics_state {
    } fs;
 
    struct {
-      struct panvk_shader *shader;
+      const struct panvk_shader *shader;
       mali_ptr attribs;
       mali_ptr attrib_bufs;
 #if PAN_ARCH <= 7

src/panfrost/vulkan/panvk_shader.h

@@ -156,8 +156,8 @@ panvk_shader_get_dev_addr(const struct panvk_shader *shader)
 }
 
 void panvk_per_arch(link_shaders)(struct panvk_pool *desc_pool,
-                                  struct panvk_shader *vs,
-                                  struct panvk_shader *fs,
+                                  const struct panvk_shader *vs,
+                                  const struct panvk_shader *fs,
                                   struct panvk_shader_link *link);
 
 static inline void

src/panfrost/vulkan/panvk_vX_shader.c

@@ -1049,7 +1049,8 @@ emit_varying_attrs(struct panvk_pool *desc_pool,
 
 void
 panvk_per_arch(link_shaders)(struct panvk_pool *desc_pool,
-                             struct panvk_shader *vs, struct panvk_shader *fs,
+                             const struct panvk_shader *vs,
+                             const struct panvk_shader *fs,
                              struct panvk_shader_link *link)
 {
    BITSET_DECLARE(active_attrs, VARYING_SLOT_MAX) = {0};