[PATCH 17/21] anv: Add new VK_MESA_query_timestamp extension to anv driver

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This extension adds a single function to query the current GPU
timestamp, just like glGetInteger64v(GL_TIMESTAMP, &timestamp). This
function is needed to complete the implementation of
GOOGLE_display_timing, which needs to be able to coorelate GPU and CPU
timestamps.

Signed-off-by: Keith Packard <keithp@xxxxxxxxxx>
---
 src/intel/Makefile.vulkan.am       |  7 +++++++
 src/intel/vulkan/anv_extensions.py |  1 +
 src/intel/vulkan/anv_gem.c         | 13 +++++++++++++
 src/intel/vulkan/anv_private.h     |  1 +
 src/intel/vulkan/genX_query.c      | 15 +++++++++++++++
 src/intel/vulkan/meson.build       | 12 ++++++------
 6 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/src/intel/Makefile.vulkan.am b/src/intel/Makefile.vulkan.am
index 0f0d3815097..5d4298c040a 100644
--- a/src/intel/Makefile.vulkan.am
+++ b/src/intel/Makefile.vulkan.am
@@ -24,36 +24,43 @@
 # out and we'll fail at `make dist'
 vulkan_api_xml = $(top_srcdir)/src/vulkan/registry/vk.xml
 vk_android_native_buffer_xml = $(top_srcdir)/src/vulkan/registry/vk_android_native_buffer.xml
+vk_mesa_query_timestamp_xml = $(top_srcdir)/src/vulkan/registry/vk_mesa_query_timestamp.xml
 
 vulkan/anv_entrypoints.c: vulkan/anv_entrypoints_gen.py \
 			  vulkan/anv_extensions.py \
 			  $(vulkan_api_xml) \
+			  $(vk_mesa_query_timestamp_xml) \
 			  $(vk_android_native_buffer_xml)
 	$(MKDIR_GEN)
 	$(AM_V_GEN)$(PYTHON2) $(srcdir)/vulkan/anv_entrypoints_gen.py \
 		--xml $(vulkan_api_xml) \
 		--xml $(vk_android_native_buffer_xml) \
+		--xml $(vk_mesa_query_timestamp_xml) \
 		--outdir $(builddir)/vulkan
 vulkan/anv_entrypoints.h: vulkan/anv_entrypoints.c
 
 vulkan/anv_extensions.c: vulkan/anv_extensions_gen.py \
 			 vulkan/anv_extensions.py \
 			 $(vulkan_api_xml) \
+			 $(vk_mesa_query_timestamp_xml) \
 			 $(vk_android_native_buffer_xml)
 	$(MKDIR_GEN)
 	$(AM_V_GEN)$(PYTHON2) $(srcdir)/vulkan/anv_extensions_gen.py \
 		--xml $(vulkan_api_xml) \
 		--xml $(vk_android_native_buffer_xml) \
+		--xml $(vk_mesa_query_timestamp_xml) \
 		--out-c $@
 
 vulkan/anv_extensions.h: vulkan/anv_extensions_gen.py \
 			 vulkan/anv_extensions.py \
 			 $(vulkan_api_xml) \
+			 $(vk_mesa_query_timestamp_xml) \
 			 $(vk_android_native_buffer_xml)
 	$(MKDIR_GEN)
 	$(AM_V_GEN)$(PYTHON2) $(srcdir)/vulkan/anv_extensions_gen.py \
 		--xml $(vulkan_api_xml) \
 		--xml $(vk_android_native_buffer_xml) \
+		--xml $(vk_mesa_query_timestamp_xml) \
 		--out-h $@
 
 BUILT_SOURCES += $(VULKAN_GENERATED_FILES)
diff --git a/src/intel/vulkan/anv_extensions.py b/src/intel/vulkan/anv_extensions.py
index 1c6c4f8e27b..7706ccdb5bb 100644
--- a/src/intel/vulkan/anv_extensions.py
+++ b/src/intel/vulkan/anv_extensions.py
@@ -91,6 +91,7 @@ EXTENSIONS = [
     Extension('VK_EXT_external_memory_dma_buf',           1, True),
     Extension('VK_EXT_display_surface_counter',           1, 'VK_USE_PLATFORM_DISPLAY_KHR'),
     Extension('VK_EXT_display_control',                   1, 'VK_USE_PLATFORM_DISPLAY_KHR'),
+    Extension('VK_MESA_query_timestamp',                  1, True),
 ]
 
 class VkVersion:
diff --git a/src/intel/vulkan/anv_gem.c b/src/intel/vulkan/anv_gem.c
index 34c09891086..588b323d113 100644
--- a/src/intel/vulkan/anv_gem.c
+++ b/src/intel/vulkan/anv_gem.c
@@ -418,6 +418,19 @@ anv_gem_fd_to_handle(struct anv_device *device, int fd)
    return args.handle;
 }
 
+int
+anv_gem_reg_read(struct anv_device *device, uint32_t offset, uint64_t *result)
+{
+   struct drm_i915_reg_read args = {
+      .offset = offset
+   };
+
+   int ret = anv_ioctl(device->fd, DRM_IOCTL_I915_REG_READ, &args);
+
+   *result = args.val;
+   return ret;
+}
+
 #ifndef SYNC_IOC_MAGIC
 /* duplicated from linux/sync_file.h to avoid build-time dependency
  * on new (v4.7) kernel headers.  Once distro's are mostly using
diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index 1d3e5fcd921..337d8ca3f15 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -932,6 +932,7 @@ bool anv_gem_supports_48b_addresses(int fd);
 int anv_gem_gpu_get_reset_stats(struct anv_device *device,
                                 uint32_t *active, uint32_t *pending);
 int anv_gem_handle_to_fd(struct anv_device *device, uint32_t gem_handle);
+int anv_gem_reg_read(struct anv_device *device, uint32_t offset, uint64_t *result);
 uint32_t anv_gem_fd_to_handle(struct anv_device *device, int fd);
 int anv_gem_set_caching(struct anv_device *device, uint32_t gem_handle, uint32_t caching);
 int anv_gem_set_domain(struct anv_device *device, uint32_t gem_handle,
diff --git a/src/intel/vulkan/genX_query.c b/src/intel/vulkan/genX_query.c
index 4efcc57e475..d2de7e5f45e 100644
--- a/src/intel/vulkan/genX_query.c
+++ b/src/intel/vulkan/genX_query.c
@@ -546,6 +546,21 @@ void genX(CmdWriteTimestamp)(
    }
 }
 
+VkResult genX(QueryCurrentTimestampMESA)(
+   VkDevice                                     _device,
+   uint64_t                                     *timestamp)
+{
+   ANV_FROM_HANDLE(anv_device, device, _device);
+   int  ret;
+
+   /* XXX older kernels don't support this interface. */
+   ret = anv_gem_reg_read(device, TIMESTAMP | 1, timestamp);
+
+   if (ret != 0)
+      return VK_ERROR_DEVICE_LOST;
+   return VK_SUCCESS;
+}
+
 #if GEN_GEN > 7 || GEN_IS_HASWELL
 
 static uint32_t
diff --git a/src/intel/vulkan/meson.build b/src/intel/vulkan/meson.build
index d3ab5ac8a64..d4622ffdfdf 100644
--- a/src/intel/vulkan/meson.build
+++ b/src/intel/vulkan/meson.build
@@ -20,11 +20,11 @@
 
 anv_entrypoints = custom_target(
   'anv_entrypoints.[ch]',
-  input : ['anv_entrypoints_gen.py', vk_api_xml, vk_android_native_buffer_xml,
+  input : ['anv_entrypoints_gen.py', vk_api_xml, vk_android_native_buffer_xml, vk_mesa_query_timestamp_xml,
            'anv_extensions.py'],
   output : ['anv_entrypoints.h', 'anv_entrypoints.c'],
   command : [
-    prog_python2, '@INPUT0@', '--xml', '@INPUT1@', '--xml', '@INPUT2@',
+    prog_python2, '@INPUT0@', '--xml', '@INPUT1@', '--xml', '@INPUT2@', '--xml', '@INPUT3@',
     '--outdir', meson.current_build_dir(),
   ],
   depend_files : files('anv_extensions.py'),
@@ -32,22 +32,22 @@ anv_entrypoints = custom_target(
 
 anv_extensions_c = custom_target(
   'anv_extensions.c',
-  input : ['anv_extensions_gen.py', vk_api_xml, vk_android_native_buffer_xml,
+  input : ['anv_extensions_gen.py', vk_api_xml, vk_android_native_buffer_xml, vk_mesa_query_timestamp_xml,
            'anv_extensions.py'],
   output : 'anv_extensions.c',
   command : [
-    prog_python2, '@INPUT0@', '--xml', '@INPUT1@', '--xml', '@INPUT2@',
+    prog_python2, '@INPUT0@', '--xml', '@INPUT1@', '--xml', '@INPUT2@', '--xml', '@INPUT3@',
     '--out-c', '@OUTPUT@',
   ],
 )
 
 anv_extensions_h = custom_target(
   'anv_extensions.h',
-  input : ['anv_extensions_gen.py', vk_api_xml, vk_android_native_buffer_xml,
+  input : ['anv_extensions_gen.py', vk_api_xml, vk_android_native_buffer_xml, vk_mesa_query_timestamp_xml,
            'anv_extensions.py'],
   output : 'anv_extensions.h',
   command : [
-    prog_python2, '@INPUT0@', '--xml', '@INPUT1@', '--xml', '@INPUT2@',
+    prog_python2, '@INPUT0@', '--xml', '@INPUT1@', '--xml', '@INPUT2@', '--xml', '@INPUT3@',
     '--out-h', '@OUTPUT@',
   ],
 )
-- 
2.15.1

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