Mesa (master): intel/dump_gpu: further track mapping of BOs

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Module: Mesa
Branch: master
Commit: c4bfa6dfbb15e34171f31854c04cb8abcfdba01b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c4bfa6dfbb15e34171f31854c04cb8abcfdba01b

Author: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Date:   Thu Oct  3 11:05:45 2019 +0300

intel/dump_gpu: further track mapping of BOs

We can go further in tracking what BOs are written to by the driver by
tracking when a buffer in unmapped. A BO could be mmap, written, unmap
and never be written to again. In such case we can just write the BO's
content on the first exec buf after unmap and never write it again.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2201>

---

 src/intel/tools/intel_dump_gpu.c | 36 +++++++++++++++++++++++++++++++-----
 1 file changed, 31 insertions(+), 5 deletions(-)

diff --git a/src/intel/tools/intel_dump_gpu.c b/src/intel/tools/intel_dump_gpu.c
index 1b6a1fa6cb9..67f8559b9ae 100644
--- a/src/intel/tools/intel_dump_gpu.c
+++ b/src/intel/tools/intel_dump_gpu.c
@@ -48,9 +48,11 @@
 
 static int close_init_helper(int fd);
 static int ioctl_init_helper(int fd, unsigned long request, ...);
+static int munmap_init_helper(void *addr, size_t length);
 
 static int (*libc_close)(int fd) = close_init_helper;
 static int (*libc_ioctl)(int fd, unsigned long request, ...) = ioctl_init_helper;
+static int (*libc_munmap)(void *addr, size_t length) = munmap_init_helper;
 
 static int drm_fd = -1;
 static char *output_filename = NULL;
@@ -65,7 +67,12 @@ struct bo {
    uint32_t size;
    uint64_t offset;
    void *map;
-   bool mapped;
+   /* Tracks userspace mmapping of the buffer */
+   bool user_mapped : 1;
+   /* Using the i915-gem mmapping ioctl & execbuffer ioctl, track whether a
+    * buffer has been updated.
+    */
+   bool dirty : 1;
 };
 
 static struct bo *bos;
@@ -286,7 +293,7 @@ dump_execbuffer2(int fd, struct drm_i915_gem_execbuffer2 *execbuffer2)
       else
          data = bo->map;
 
-      if (bo->mapped) {
+      if (bo->dirty) {
          if (bo == batch_bo) {
             aub_write_trace_block(&aub_file, AUB_TRACE_TYPE_BATCH,
                                   GET_PTR(data), bo->size, bo->offset);
@@ -294,6 +301,9 @@ dump_execbuffer2(int fd, struct drm_i915_gem_execbuffer2 *execbuffer2)
             aub_write_trace_block(&aub_file, AUB_TRACE_TYPE_NOTYPE,
                                   GET_PTR(data), bo->size, bo->offset);
          }
+
+         if (!bo->user_mapped)
+            bo->dirty = false;
       }
 
       if (data != bo->map)
@@ -334,7 +344,7 @@ add_new_bo(unsigned fd, int handle, uint64_t size, void *map)
 
    bo->size = size;
    bo->map = map;
-   bo->mapped = false;
+   bo->user_mapped = false;
 }
 
 static void
@@ -346,7 +356,7 @@ remove_bo(int fd, int handle)
       munmap(bo->map, bo->size);
    bo->size = 0;
    bo->map = NULL;
-   bo->mapped = false;
+   bo->user_mapped = false;
 }
 
 __attribute__ ((visibility ("default"))) int
@@ -646,7 +656,8 @@ ioctl(int fd, unsigned long request, ...)
          if (ret == 0) {
             struct drm_i915_gem_mmap *mmap = argp;
             struct bo *bo = get_bo(fd, mmap->handle);
-            bo->mapped = true;
+            bo->user_mapped = true;
+            bo->dirty = true;
          }
          return ret;
       }
@@ -664,6 +675,7 @@ init(void)
 {
    libc_close = dlsym(RTLD_NEXT, "close");
    libc_ioctl = dlsym(RTLD_NEXT, "ioctl");
+   libc_munmap = dlsym(RTLD_NEXT, "munmap");
    fail_if(libc_close == NULL || libc_ioctl == NULL,
            "failed to get libc ioctl or close\n");
 }
@@ -689,6 +701,20 @@ ioctl_init_helper(int fd, unsigned long request, ...)
    return libc_ioctl(fd, request, argp);
 }
 
+static int
+munmap_init_helper(void *addr, size_t length)
+{
+   init();
+   for (uint32_t i = 0; i < MAX_FD_COUNT * MAX_BO_COUNT; i++) {
+      struct bo *bo = &bos[i];
+      if (bo->map == addr) {
+         bo->user_mapped = false;
+         break;
+      }
+   }
+   return libc_munmap(addr, length);
+}
+
 static void __attribute__ ((destructor))
 fini(void)
 {