sync with OpenBSD -current

lib/libva/va/drm/va_drm_utils.c

@@ -0,0 +1,113 @@
+/*
+ * va_drm_utils.c - VA/DRM Utilities
+ *
+ * Copyright (c) 2012 Intel Corporation. All Rights Reserved.
+ * Copyright (c) 2023 Emil Velikov
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "sysdeps.h"
+#include <xf86drm.h>
+#include <sys/stat.h>
+#include <sys/utsname.h>
+#include "va_drm_utils.h"
+#include "va_drmcommon.h"
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+static char *
+va_DRM_GetDrmDriverName(int fd)
+{
+    drmVersionPtr drm_version = drmGetVersion(fd);
+    char *driver_name;
+
+    if (!drm_version)
+        return NULL;
+
+    driver_name = strdup(drm_version->name);
+    drmFreeVersion(drm_version);
+
+    return driver_name;
+}
+
+/* Returns the VA driver names and how many they are, for the active display */
+VAStatus
+VA_DRM_GetDriverNames(VADriverContextP ctx, char **drivers, unsigned *num_drivers)
+{
+#define MAX_NAMES 2 // Adjust if needed
+
+    static const struct {
+        const char * const drm_driver;
+        const char * const va_driver[MAX_NAMES];
+    } map[] = {
+        { "xe",         { "iHD"              } },
+        { "i915",       { "iHD", "i965"      } }, // Intel Media and OTC GenX
+        { "pvrsrvkm",   { "pvr"              } }, // Intel UMG PVR
+        { "radeon",     { "r600", "radeonsi" } }, // Mesa Gallium
+        { "amdgpu",     { "radeonsi"         } }, // Mesa Gallium
+        { "WSL",        { "d3d12"            } }, // Mesa Gallium
+        { "nvidia-drm", { "nvidia"           } }, // Unofficial NVIDIA
+    };
+
+    const struct drm_state * const drm_state = ctx->drm_state;
+    char *drm_driver;
+    unsigned count = 0;
+
+    if (!drm_state || drm_state->fd < 0)
+        return VA_STATUS_ERROR_INVALID_DISPLAY;
+
+    drm_driver = va_DRM_GetDrmDriverName(drm_state->fd);
+    if (!drm_driver)
+        return VA_STATUS_ERROR_UNKNOWN;
+
+    /* Map vgem to WSL2 for Windows subsystem for linux */
+    struct utsname sysinfo = {};
+    if (!strncmp(drm_driver, "vgem", 4) && uname(&sysinfo) >= 0 &&
+        strstr(sysinfo.release, "WSL")) {
+        free(drm_driver);
+        drm_driver = strdup("WSL");
+        if (!drm_driver)
+            return VA_STATUS_ERROR_UNKNOWN;
+    }
+
+    for (unsigned i = 0; i < ARRAY_SIZE(map); i++) {
+        if (strcmp(map[i].drm_driver, drm_driver) == 0) {
+            const char * const *va_drivers = map[i].va_driver;
+            for (; count < MAX_NAMES && va_drivers[count] && count < *num_drivers; count++)
+                drivers[count] = strdup(va_drivers[count]);
+
+            break;
+        }
+    }
+
+    /* Fallback to the drm driver, if there's no va equivalent in the map. */
+    if (!count) {
+        drivers[count] = drm_driver;
+        count++;
+    } else {
+        free(drm_driver);
+    }
+
+    *num_drivers = count;
+
+    return VA_STATUS_SUCCESS;
+}