[Mesa-dev] [PATCH 19/24] ac/gpu: add driver/device UUID query helpers

[Timothy Arceri]

From: Andres Rodriguez <andresx7 at gmail.com>

We need vulkan and gl to produce the same UUIDs. Therefore we should
keep the mechanism to compute these in a common location to guarantee
they are updated in lockstep.

Signed-off-by: Andres Rodriguez <andresx7 at gmail.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
---
 src/amd/common/ac_gpu_info.c | 27 +++++++++++++++++++++++++++
 src/amd/common/ac_gpu_info.h |  5 +++++
 2 files changed, 32 insertions(+)

diff --git a/src/amd/common/ac_gpu_info.c b/src/amd/common/ac_gpu_info.c
index 929dfd2..e55d864 100644
--- a/src/amd/common/ac_gpu_info.c
+++ b/src/amd/common/ac_gpu_info.c
@@ -314,3 +314,30 @@ bool ac_query_gpu_info(int fd, amdgpu_device_handle dev,
 	return true;
 }
 
+void ac_compute_driver_uuid(char *uuid, size_t size)
+{
+	char amd_uuid[] = "AMD-MESA-DRV";
+
+	assert(size >= sizeof(amd_uuid));
+
+	memset(uuid, 0, size);
+	strncpy(uuid, amd_uuid, size);
+}
+
+void ac_compute_device_uuid(struct radeon_info *info, char *uuid, size_t size)
+{
+	uint32_t *uint_uuid = (uint32_t*)uuid;
+
+	assert(size >= sizeof(uint32_t)*4);
+
+	/**
+	 * Use the device info directly instead of using a sha1. GL/VK UUIDs
+	 * are 16 byte vs 20 byte for sha1, and the truncation that would be
+	 * required would get rid of part of the little entropy we have.
+	 * */
+	memset(uuid, 0, size);
+	uint_uuid[0] = info->pci_domain;
+	uint_uuid[1] = info->pci_bus;
+	uint_uuid[2] = info->pci_dev;
+	uint_uuid[3] = info->pci_func;
+}
diff --git a/src/amd/common/ac_gpu_info.h b/src/amd/common/ac_gpu_info.h
index 20907c2..06b0c77 100644
--- a/src/amd/common/ac_gpu_info.h
+++ b/src/amd/common/ac_gpu_info.h
@@ -26,6 +26,7 @@
 #ifndef AC_GPU_INFO_H
 #define AC_GPU_INFO_H
 
+#include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
 #include "amd_family.h"
@@ -106,6 +107,10 @@ bool ac_query_gpu_info(int fd, amdgpu_device_handle dev,
 		       struct radeon_info *info,
 		       struct amdgpu_gpu_info *amdinfo);
 
+void ac_compute_driver_uuid(char *uuid, size_t size);
+
+void ac_compute_device_uuid(struct radeon_info *info, char *uuid, size_t size);
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.9.4