src/freedreno/common/freedreno_uuid.c

   1 /*
   2  * Copyright © 2020 Igalia S.L.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #include "freedreno_uuid.h"
  25
  26 #include <assert.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29
  30 #include "git_sha1.h"
  31 #include "util/mesa-sha1.h"
  32
  33 /* (Re)define UUID_SIZE to avoid including vulkan.h (or p_defines.h) here. */
  34 #define UUID_SIZE 16
  35
  36 void
  37 fd_get_driver_uuid(void *uuid)
  38 {
  39         const char *driver_id = PACKAGE_VERSION MESA_GIT_SHA1;
  40
  41         /* The driver UUID is used for determining sharability of images and memory
  42          * between two Vulkan instances in separate processes, but also to
  43          * determining memory objects and sharability between Vulkan and OpenGL
  44          * driver. People who want to share memory need to also check the device
  45          * UUID.
  46          */
  47         struct mesa_sha1 sha1_ctx;
  48         _mesa_sha1_init(&sha1_ctx);
  49
  50         _mesa_sha1_update(&sha1_ctx, driver_id, strlen(driver_id));
  51
  52         uint8_t sha1[SHA1_DIGEST_LENGTH];
  53         _mesa_sha1_final(&sha1_ctx, sha1);
  54
  55         assert(SHA1_DIGEST_LENGTH >= UUID_SIZE);
  56         memcpy(uuid, sha1, UUID_SIZE);
  57 }
  58
  59 void
  60 fd_get_device_uuid(void *uuid, unsigned gpu_id)
  61 {
  62         struct mesa_sha1 sha1_ctx;
  63         _mesa_sha1_init(&sha1_ctx);
  64
  65         /* The device UUID uniquely identifies the given device within the machine.
  66          * Since we never have more than one device, this doesn't need to be a real
  67          * UUID, so we use SHA1("freedreno" + gpu_id).
  68          *
  69          * @TODO: Using the GPU id could be too restrictive on the off-chance that
  70          * someone would like to use this UUID to cache pre-tiled images or something
  71          * of the like, and use them across devices. In the future, we could allow
  72          * that by:
  73          * * Being a bit loose about GPU id and hash only the generation's
  74          * 'major' number (e.g, '6' instead of '630').
  75          *
  76          * * Include HW specific constants that are relevant for layout resolving,
  77          * like minimum width to enable UBWC, tile_align_w, etc.
  78          *
  79          * This would allow cached device memory to be safely used from HW in
  80          * (slightly) different revisions of the same generation.
  81          */
  82
  83         static const char *device_name = "freedreno";
  84         _mesa_sha1_update(&sha1_ctx, device_name, strlen(device_name));
  85
  86         _mesa_sha1_update(&sha1_ctx, &gpu_id, sizeof(gpu_id));
  87
  88         uint8_t sha1[SHA1_DIGEST_LENGTH];
  89         _mesa_sha1_final(&sha1_ctx, sha1);
  90
  91         assert(SHA1_DIGEST_LENGTH >= UUID_SIZE);
  92         memcpy(uuid, sha1, UUID_SIZE);
  93 }