gallivm: rework coroutine malloc/free callouts.

When using cached shaders we have to relink the shader with
external symbols when it's loaded. However the way gallivm does
function calls now hardcodes the function pointer into the shader.

LLVM had a mechanism for doing this properly using global mappings,
this switches the coroutine alloc/free code to use a global mapping.

Reviewed-by: Roland Scheidegger <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5049>

5 files changed, 35 insertions, 11 deletions

diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 79322e4485b..db8e24f4306 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -3464,10 +3464,12 @@ draw_tcs_llvm_create_variant(struct draw_llvm *llvm,
       draw_tcs_llvm_dump_variant_key(&variant->key);
    }
 
+   lp_build_coro_declare_malloc_hooks(variant->gallivm);
    draw_tcs_llvm_generate(llvm, variant);
 
    gallivm_compile_module(variant->gallivm);
 
+   lp_build_coro_add_malloc_hooks(variant->gallivm);
    variant->jit_func = (draw_tcs_jit_func)
       gallivm_jit_function(variant->gallivm, variant->function);
 
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_coro.c b/src/gallium/auxiliary/gallivm/lp_bld_coro.c
index 8f3db6f481f..28f722e93c2 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_coro.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_coro.c
@@ -154,6 +154,26 @@ coro_free(char *ptr)
    os_free_aligned(ptr);
 }
 
+void lp_build_coro_add_malloc_hooks(struct gallivm_state *gallivm)
+{
+   assert(gallivm->engine);
+
+   assert(gallivm->coro_malloc_hook);
+   assert(gallivm->coro_free_hook);
+   LLVMAddGlobalMapping(gallivm->engine, gallivm->coro_malloc_hook, coro_malloc);
+   LLVMAddGlobalMapping(gallivm->engine, gallivm->coro_free_hook, coro_free);
+}
+
+void lp_build_coro_declare_malloc_hooks(struct gallivm_state *gallivm)
+{
+   LLVMTypeRef int32_type = LLVMInt32TypeInContext(gallivm->context);
+   LLVMTypeRef mem_ptr_type = LLVMPointerType(LLVMInt8TypeInContext(gallivm->context), 0);
+   LLVMTypeRef malloc_type = LLVMFunctionType(mem_ptr_type, &int32_type, 1, 0);
+   gallivm->coro_malloc_hook = LLVMAddFunction(gallivm->module, "coro_malloc", malloc_type);
+   LLVMTypeRef free_type = LLVMFunctionType(LLVMVoidTypeInContext(gallivm->context), &mem_ptr_type, 1, 0);
+   gallivm->coro_free_hook = LLVMAddFunction(gallivm->module, "coro_free", free_type);
+}
+
 LLVMValueRef lp_build_coro_begin_alloc_mem(struct gallivm_state *gallivm, LLVMValueRef coro_id)
 {
    LLVMValueRef do_alloc = lp_build_coro_alloc(gallivm, coro_id);
@@ -163,13 +183,9 @@ LLVMValueRef lp_build_coro_begin_alloc_mem(struct gallivm_state *gallivm, LLVMVa
    lp_build_if(&if_state_coro, gallivm, do_alloc);
    LLVMValueRef coro_size = lp_build_coro_size(gallivm);
    LLVMValueRef alloc_mem;
-   LLVMTypeRef int32_type = LLVMInt32TypeInContext(gallivm->context);
 
-   LLVMTypeRef malloc_type = LLVMFunctionType(mem_ptr_type, &int32_type, 1, 0);
-
-   LLVMValueRef func_malloc = lp_build_const_int_pointer(gallivm, func_to_pointer((func_pointer)coro_malloc));
-   func_malloc = LLVMBuildBitCast(gallivm->builder, func_malloc, LLVMPointerType(malloc_type, 0), "coro_malloc");
-   alloc_mem = LLVMBuildCall(gallivm->builder, func_malloc, &coro_size, 1, "");
+   assert(gallivm->coro_malloc_hook);
+   alloc_mem = LLVMBuildCall(gallivm->builder, gallivm->coro_malloc_hook, &coro_size, 1, "");
 
    LLVMBuildStore(gallivm->builder, alloc_mem, alloc_mem_store);
    lp_build_endif(&if_state_coro);
@@ -181,11 +197,9 @@ LLVMValueRef lp_build_coro_begin_alloc_mem(struct gallivm_state *gallivm, LLVMVa
 void lp_build_coro_free_mem(struct gallivm_state *gallivm, LLVMValueRef coro_id, LLVMValueRef coro_hdl)
 {
    LLVMValueRef alloc_mem = lp_build_coro_free(gallivm, coro_id, coro_hdl);
-   LLVMTypeRef ptr_type = LLVMPointerType(LLVMInt8TypeInContext(gallivm->context), 0);
-   LLVMTypeRef free_type = LLVMFunctionType(LLVMVoidTypeInContext(gallivm->context), &ptr_type, 1, 0);
-   LLVMValueRef func_free = lp_build_const_int_pointer(gallivm, func_to_pointer((func_pointer)coro_free));
-   func_free = LLVMBuildBitCast(gallivm->builder, func_free, LLVMPointerType(free_type, 0), "coro_free");
-   alloc_mem = LLVMBuildCall(gallivm->builder, func_free, &alloc_mem, 1, "");
+
+   assert(gallivm->coro_malloc_hook);
+   alloc_mem = LLVMBuildCall(gallivm->builder, gallivm->coro_free_hook, &alloc_mem, 1, "");
 }
 
 void lp_build_coro_suspend_switch(struct gallivm_state *gallivm, const struct lp_build_coro_suspend_info *sus_info,
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_coro.h b/src/gallium/auxiliary/gallivm/lp_bld_coro.h
index 4cb1e7c6e4d..2ffc130c9ad 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_coro.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_coro.h
@@ -66,4 +66,7 @@ void lp_build_coro_suspend_switch(struct gallivm_state *gallivm,
                                   const struct lp_build_coro_suspend_info *sus_info,
                                   LLVMBasicBlockRef resume_block,
                                   bool final_suspend);
+
+void lp_build_coro_add_malloc_hooks(struct gallivm_state *gallivm);
+void lp_build_coro_declare_malloc_hooks(struct gallivm_state *gallivm);
 #endif
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init.h b/src/gallium/auxiliary/gallivm/lp_bld_init.h
index 56279ce1aac..1c0c627fb59 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_init.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_init.h
@@ -52,6 +52,8 @@ struct gallivm_state
    LLVMMCJITMemoryManagerRef memorymgr;
    struct lp_generated_code *code;
    unsigned compiled;
+   LLVMValueRef coro_malloc_hook;
+   LLVMValueRef coro_free_hook;
 };
 
 
diff --git a/src/gallium/drivers/llvmpipe/lp_state_cs.c b/src/gallium/drivers/llvmpipe/lp_state_cs.c
index 9c4699331a0..97c479ef455 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_cs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_cs.c
@@ -138,6 +138,8 @@ generate_compute(struct llvmpipe_context *lp,
       }
    }
 
+   lp_build_coro_declare_malloc_hooks(gallivm);
+
    context_ptr  = LLVMGetParam(function, 0);
    x_size_arg = LLVMGetParam(function, 1);
    y_size_arg = LLVMGetParam(function, 2);
@@ -709,6 +711,7 @@ generate_variant(struct llvmpipe_context *lp,
 
    gallivm_compile_module(variant->gallivm);
 
+   lp_build_coro_add_malloc_hooks(variant->gallivm);
    variant->nr_instrs += lp_build_count_ir_module(variant->gallivm->module);
 
    variant->jit_function = (lp_jit_cs_func)gallivm_jit_function(variant->gallivm, variant->function);