init

src/util/os_drm.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2024 Advanced Micro Devices, Inc.
+ * SPDX-License-Identifier: MIT
+ */
+
+/* These are identical to libdrm functions drmCommandWrite* and drmIoctl,
+ * but unlike libdrm, these are inlinable.
+ */
+
+#ifndef OS_DRM_H
+#define OS_DRM_H
+
+#ifdef _WIN32
+#error "Windows shouldn't include this."
+#endif
+
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <xf86drm.h>
+
+static inline int
+drm_ioctl(int fd, uint32_t request, void *arg)
+{
+   int ret;
+
+   do {
+      ret = ioctl(fd, request, arg);
+   } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
+
+   return ret ? -errno : 0;
+}
+
+static inline int
+drm_ioctl_write(int fd, unsigned drm_command_index, void *data, unsigned size)
+{
+   uint32_t request = DRM_IOC(DRM_IOC_WRITE, DRM_IOCTL_BASE,
+                              DRM_COMMAND_BASE + drm_command_index, size);
+   return drm_ioctl(fd, request, data);
+}
+
+static inline int
+drm_ioctl_write_read(int fd, unsigned drm_command_index, void *data,
+                     unsigned size)
+{
+   uint32_t request = DRM_IOC(DRM_IOC_READ | DRM_IOC_WRITE, DRM_IOCTL_BASE,
+                              DRM_COMMAND_BASE + drm_command_index, size);
+   return drm_ioctl(fd, request, data);
+}
+
+#endif