igt/gem_concurrent_blit: dmabuf requires twice the number of files

In order to keep the dmabuf mmap around whilst we keep the object alive,
we need a file descriptor for each. Check that the VFS supports that
many fd.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index eabeefd2..101fad12 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -97,6 +97,7 @@ uint64_t intel_get_total_swap_mb(void);
 int __intel_check_memory(uint64_t count, uint64_t size, unsigned mode,
 			 uint64_t *out_required, uint64_t *out_total);
 void intel_require_memory(uint64_t count, uint64_t size, unsigned mode);
+void intel_require_files(uint64_t count);
 #define CHECK_RAM 0x1
 #define CHECK_SWAP 0x2
 
diff --git a/lib/intel_os.c b/lib/intel_os.c
index 90b30210..8fcf0d63 100644
--- a/lib/intel_os.c
+++ b/lib/intel_os.c
@@ -192,6 +192,19 @@ static uint64_t vfs_file_max(void)
 	return max;
 }
 
+/**
+ * intel_require_files:
+ * @count: number of files that will be created
+ *
+ * Does the system support enough file descriptors for the test?
+ */
+void intel_require_files(uint64_t count)
+{
+	igt_require_f(count < vfs_file_max(),
+		      "Estimated that we need %'llu files, but the VFS maximum is only %'llu\n",
+		      (long long)count, (long long)vfs_file_max());
+}
+
 int __intel_check_memory(uint64_t count, uint64_t size, unsigned mode,
 			 uint64_t *out_required, uint64_t *out_total)
 {