[Mesa-dev] [PATCH 01/21] anv: Add the pci_id into the shader cache UUID

[Jason Ekstrand]

This prevents a user from using a cache created on one hardware
generation on a different one.  Of course, with Intel hardware, this
requires moving their drive from one machine to another but it's still
possible and we should prevent it.

Reviewed-by: Chad Versace <chadversary at chromium.org>
---
 src/intel/vulkan/anv_device.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c
index 35ef4c4..7a25ee9 100644
--- a/src/intel/vulkan/anv_device.c
+++ b/src/intel/vulkan/anv_device.c
@@ -34,6 +34,7 @@
 #include "util/strtod.h"
 #include "util/debug.h"
 #include "util/build_id.h"
+#include "util/mesa-sha1.h"
 #include "util/vk_util.h"
 
 #include "genxml/gen7_pack.h"
@@ -97,17 +98,26 @@ anv_compute_heap_size(int fd, uint64_t *heap_size)
 }
 
 static bool
-anv_device_get_cache_uuid(void *uuid)
+anv_device_get_cache_uuid(void *uuid, uint16_t pci_id)
 {
    const struct build_id_note *note = build_id_find_nhdr("libvulkan_intel.so");
    if (!note)
       return false;
 
-   unsigned len = build_id_length(note);
-   if (len < VK_UUID_SIZE)
+   unsigned build_id_len = build_id_length(note);
+   if (build_id_len < 20) /* It should be a SHA-1 */
       return false;
 
-   memcpy(uuid, build_id_data(note), VK_UUID_SIZE);
+   struct mesa_sha1 sha1_ctx;
+   uint8_t sha1[20];
+   STATIC_ASSERT(VK_UUID_SIZE <= sizeof(sha1));
+
+   _mesa_sha1_init(&sha1_ctx);
+   _mesa_sha1_update(&sha1_ctx, build_id_data(note), build_id_len);
+   _mesa_sha1_update(&sha1_ctx, &pci_id, sizeof(pci_id));
+   _mesa_sha1_final(&sha1_ctx, sha1);
+
+   memcpy(uuid, sha1, VK_UUID_SIZE);
    return true;
 }
 
@@ -192,7 +202,7 @@ anv_physical_device_init(struct anv_physical_device *device,
    if (result != VK_SUCCESS)
       goto fail;
 
-   if (!anv_device_get_cache_uuid(device->uuid)) {
+   if (!anv_device_get_cache_uuid(device->uuid, device->chipset_id)) {
       result = vk_errorf(VK_ERROR_INITIALIZATION_FAILED,
                          "cannot generate UUID");
       goto fail;
-- 
2.5.0.400.gff86faf