rusticl: support cl_khr_kernel_clock

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35179>

docs/features.txt

@@ -828,6 +828,7 @@ Rusticl extensions that are not part of any OpenCL version:
   cl_khr_int64_base_atomics                             not started
   cl_khr_int64_extended_atomics                         not started
   cl_khr_integer_dot_product                            DONE
+  cl_khr_kernel_clock                                   DONE (freedreno, iris, llvmpipe, nvc0, panfrost, radeonsi, zink, needs llvm-19)
   cl_khr_mipmap_image                                   not started
   cl_khr_pci_bus_info                                   DONE (iris, nvc0, radeonsi, zink)
   cl_khr_priority_hints                                 not started

docs/relnotes/new_features.txt

@@ -25,3 +25,4 @@ VK_EXT_zero_initialize_device_memory on RADV and NVK
 VK_EXT_primitive_topology_list_restart on panvk
 VK_EXT_image_2d_view_of_3d on panvk
 VK_EXT_texel_buffer_alignment on panvk
+cl_khr_kernel_clock on freedreno, iris, llvmpipe, nvc0, panfrost, radeonsi and zink with llvm-19 or newer

docs/rusticl.rst

@@ -51,9 +51,9 @@ The minimum versions to build Rusticl are:
 -  Rust: 1.78
 -  Meson: 1.4.0
 -  Bindgen: 0.65.0
--  LLVM: 15.0.0
+-  LLVM: 15.0.0 (recommended 19.0.0)
 -  Clang: 15.0.0
-   Updating clang requires a rebuilt of mesa and rusticl if and only if the value of
+   Updating clang requires a rebuilt mesa and rusticl if and only if the value of
    ``CLANG_RESOURCE_DIR`` changes. It is defined through ``clang/Config/config.h``.
 -  SPIRV-Tools: any version (recommended: v2025.1)
 

src/gallium/frontends/rusticl/api/device.rs

@@ -150,7 +150,13 @@ unsafe impl CLInfo<cl_device_info> for cl_device_id {
                     )
                 })
             }
-
+            CL_DEVICE_KERNEL_CLOCK_CAPABILITIES_KHR if dev.kernel_clock_supported() => {
+                v.write::<cl_device_kernel_clock_capabilities_khr>(
+                    (CL_DEVICE_KERNEL_CLOCK_SCOPE_DEVICE_KHR
+                        | CL_DEVICE_KERNEL_CLOCK_SCOPE_SUB_GROUP_KHR)
+                        .into(),
+                )
+            }
             CL_DEVICE_LATEST_CONFORMANCE_VERSION_PASSED => {
                 v.write::<&CStr>(dev.screen().cl_cts_version())
             }

src/gallium/frontends/rusticl/core/device.rs

@@ -17,6 +17,7 @@ use mesa_rust::pipe::transfer::PipeTransfer;
 use mesa_rust_gen::*;
 use mesa_rust_util::math::SetBitIndices;
 use mesa_rust_util::static_assert;
+use rusticl_llvm_gen::*;
 use rusticl_opencl_gen::*;
 
 use std::cmp::max;
@@ -684,6 +685,13 @@ impl Device {
             add_feat(1, 0, 0, "__opencl_c_int64");
         }
 
+        if self.kernel_clock_supported() {
+            add_ext(1, 0, 0, "cl_khr_kernel_clock");
+            add_feat(1, 0, 0, "__opencl_c_kernel_clock_scope_device");
+            add_feat(1, 0, 0, "__opencl_c_kernel_clock_scope_sub_group");
+            add_spirv(c"SPV_KHR_shader_clock");
+        }
+
         if self.caps.has_images {
             add_feat(1, 0, 0, "__opencl_c_images");
 
@@ -1128,6 +1136,10 @@ impl Device {
         self.screen.compute_caps().max_subgroups
     }
 
+    pub fn kernel_clock_supported(&self) -> bool {
+        self.screen.caps().shader_clock && LLVM_VERSION_MAJOR >= 19
+    }
+
     pub fn subgroups_supported(&self) -> bool {
         let subgroup_sizes = self.subgroup_sizes().len();
 
@@ -1187,6 +1199,7 @@ impl Device {
             images_write_3d: self.caps.has_3d_image_writes,
             integer_dot_product: true,
             intel_subgroups: self.intel_subgroups_supported(),
+            kernel_clock: self.kernel_clock_supported(),
             subgroups: subgroups_supported,
             subgroups_shuffle: subgroups_supported,
             subgroups_shuffle_relative: subgroups_supported,

src/gallium/frontends/rusticl/mesa/compiler/clc/spirv.rs

@@ -297,6 +297,7 @@ impl SPIRVBin {
             LiteralSampler: true,
             SampledBuffer: true,
             Sampled1D: true,
+            ShaderClockKHR: true,
             UniformDecoration: true,
             Vector16: true,
             ..Default::default()