[cogl/halfline/wip/render-node: 2/6] kms-winsys: rework kms fd handling

[Ray Strode <halfline src gnome org>]

commit dcd7347349a440d06caa9fc850e32869e21973ac
Author: Ray Strode <rstrode redhat com>
Date:   Wed Aug 26 11:30:04 2015 -0400

    kms-winsys: rework kms fd handling
    
    At the moment the kms fd is stored in the renderer structure twice:
    once for reading and once for closing. This is a little messy, and
    will only get worse when we start throwing render nodes into the mix
    too.
    
    This commit moves abstracts the device handling out to another
    structure. Rather than having two members for each fd, this commit
    employees a boolean to decide whether or not the fd needs to get
    explicitly closed.

 cogl/winsys/cogl-winsys-egl-kms.c |   66 +++++++++++++++++++-----------------
 1 files changed, 35 insertions(+), 31 deletions(-)
---
diff --git a/cogl/winsys/cogl-winsys-egl-kms.c b/cogl/winsys/cogl-winsys-egl-kms.c
index 971643a..2c7d448 100644
--- a/cogl/winsys/cogl-winsys-egl-kms.c
+++ b/cogl/winsys/cogl-winsys-egl-kms.c
@@ -66,11 +66,16 @@ static const CoglWinsysEGLVtable _cogl_winsys_egl_vtable;
 
 static const CoglWinsysVtable *parent_vtable;
 
-typedef struct _CoglRendererKMS
+typedef struct _CoglRendererDeviceKMS
 {
   int fd;
-  int opened_fd;
   struct gbm_device *gbm;
+  CoglBool is_borrowed;
+} CoglRendererDeviceKMS;
+
+typedef struct _CoglRendererKMS
+{
+  CoglRendererDeviceKMS card_device;
   CoglClosure *swap_notify_idle;
   CoglBool     page_flips_not_supported;
 } CoglRendererKMS;
@@ -127,11 +132,11 @@ _cogl_winsys_renderer_disconnect (CoglRenderer *renderer)
   if (egl_renderer->edpy != EGL_NO_DISPLAY)
     eglTerminate (egl_renderer->edpy);
 
-  if (kms_renderer->gbm != NULL)
-    gbm_device_destroy (kms_renderer->gbm);
+  if (kms_renderer->card_device.gbm != NULL)
+    gbm_device_destroy (kms_renderer->card_device.gbm);
 
-  if (kms_renderer->opened_fd >= 0)
-    close (kms_renderer->opened_fd);
+  if (kms_renderer->card_device.is_borrowed && kms_renderer->card_device.fd >= 0)
+    close (kms_renderer->card_device.fd);
 
   g_slice_free (CoglRendererKMS, kms_renderer);
   g_slice_free (CoglRendererEGL, egl_renderer);
@@ -191,7 +196,7 @@ free_current_bo (CoglOnscreen *onscreen)
 
   if (kms_onscreen->current_fb_id)
     {
-      drmModeRmFB (kms_renderer->fd,
+      drmModeRmFB (kms_renderer->card_device.fd,
                    kms_onscreen->current_fb_id);
       kms_onscreen->current_fb_id = 0;
     }
@@ -279,7 +284,7 @@ handle_drm_event (CoglRendererKMS *kms_renderer)
   memset (&evctx, 0, sizeof evctx);
   evctx.version = DRM_EVENT_CONTEXT_VERSION;
   evctx.page_flip_handler = page_flip_handler;
-  drmHandleEvent (kms_renderer->fd, &evctx);
+  drmHandleEvent (kms_renderer->card_device.fd, &evctx);
 }
 
 static void
@@ -309,20 +314,19 @@ _cogl_winsys_renderer_connect (CoglRenderer *renderer,
   egl_renderer->platform = g_slice_new0 (CoglRendererKMS);
   kms_renderer = egl_renderer->platform;
 
-  kms_renderer->fd = -1;
-  kms_renderer->opened_fd = -1;
+  kms_renderer->card_device.fd = -1;
 
   egl_renderer->edpy = EGL_NO_DISPLAY;
 
   if (renderer->kms_fd >= 0)
     {
-      kms_renderer->fd = renderer->kms_fd;
+      kms_renderer->card_device.fd = renderer->kms_fd;
+      kms_renderer->card_device.is_borrowed = TRUE;
     }
   else
     {
-      kms_renderer->opened_fd = open (device_name, O_RDWR);
-      kms_renderer->fd = kms_renderer->opened_fd;
-      if (kms_renderer->fd < 0)
+      kms_renderer->card_device.fd = open (device_name, O_RDWR);
+      if (kms_renderer->card_device.fd < 0)
         {
           /* Probably permissions error */
           _cogl_set_error (error, COGL_WINSYS_ERROR,
@@ -332,8 +336,8 @@ _cogl_winsys_renderer_connect (CoglRenderer *renderer,
         }
     }
 
-  kms_renderer->gbm = gbm_create_device (kms_renderer->fd);
-  if (kms_renderer->gbm == NULL)
+  kms_renderer->card_device.gbm = gbm_create_device (kms_renderer->card_device.fd);
+  if (kms_renderer->card_device.gbm == NULL)
     {
       _cogl_set_error (error, COGL_WINSYS_ERROR,
                    COGL_WINSYS_ERROR_INIT,
@@ -341,7 +345,7 @@ _cogl_winsys_renderer_connect (CoglRenderer *renderer,
       goto fail;
     }
 
-  egl_renderer->edpy = eglGetDisplay ((EGLNativeDisplayType)kms_renderer->gbm);
+  egl_renderer->edpy = eglGetDisplay ((EGLNativeDisplayType)kms_renderer->card_device.gbm);
   if (egl_renderer->edpy == EGL_NO_DISPLAY)
     {
       _cogl_set_error (error, COGL_WINSYS_ERROR,
@@ -354,7 +358,7 @@ _cogl_winsys_renderer_connect (CoglRenderer *renderer,
     goto fail;
 
   _cogl_poll_renderer_add_fd (renderer,
-                              kms_renderer->fd,
+                              kms_renderer->card_device.fd,
                               COGL_POLL_FD_EVENT_IN,
                               NULL, /* no prepare callback */
                               dispatch_kms_events,
@@ -566,7 +570,7 @@ setup_crtc_modes (CoglDisplay *display, int fb_id)
     {
       CoglKmsCrtc *crtc = l->data;
 
-      int ret = drmModeSetCrtc (kms_renderer->fd,
+      int ret = drmModeSetCrtc (kms_renderer->card_device.fd,
                                 crtc->id,
                                 fb_id, crtc->x, crtc->y,
                                 crtc->connectors, crtc->count,
@@ -598,7 +602,7 @@ flip_all_crtcs (CoglDisplay *display, CoglFlipKMS *flip, int fb_id)
 
       if (!kms_renderer->page_flips_not_supported)
         {
-          ret = drmModePageFlip (kms_renderer->fd,
+          ret = drmModePageFlip (kms_renderer->card_device.fd,
                                  crtc->id, fb_id,
                                  DRM_MODE_PAGE_FLIP_EVENT, flip);
           if (ret)
@@ -652,7 +656,7 @@ _cogl_winsys_egl_display_setup (CoglDisplay *display,
   kms_display = g_slice_new0 (CoglDisplayKMS);
   egl_display->platform = kms_display;
 
-  resources = drmModeGetResources (kms_renderer->fd);
+  resources = drmModeGetResources (kms_renderer->card_device.fd);
   if (!resources)
     {
       _cogl_set_error (error, COGL_WINSYS_ERROR,
@@ -662,7 +666,7 @@ _cogl_winsys_egl_display_setup (CoglDisplay *display,
     }
 
   output0 = find_output (0,
-                         kms_renderer->fd,
+                         kms_renderer->card_device.fd,
                          resources,
                          NULL,
                          0, /* n excluded connectors */
@@ -681,7 +685,7 @@ _cogl_winsys_egl_display_setup (CoglDisplay *display,
     {
       int exclude_connector = output0->connector->connector_id;
       output1 = find_output (1,
-                             kms_renderer->fd,
+                             kms_renderer->card_device.fd,
                              resources,
                              &exclude_connector,
                              1, /* n excluded connectors */
@@ -781,7 +785,7 @@ _cogl_winsys_egl_display_destroy (CoglDisplay *display)
   GList *l;
 
   for (l = kms_display->outputs; l; l = l->next)
-    output_free (kms_renderer->fd, l->data);
+    output_free (kms_renderer->card_device.fd, l->data);
   g_list_free (kms_display->outputs);
   kms_display->outputs = NULL;
 
@@ -804,7 +808,7 @@ _cogl_winsys_egl_context_created (CoglDisplay *display,
        COGL_EGL_WINSYS_FEATURE_SURFACELESS_CONTEXT) == 0)
     {
       kms_display->dummy_gbm_surface =
-        gbm_surface_create (kms_renderer->gbm,
+        gbm_surface_create (kms_renderer->card_device.gbm,
                             16, 16,
                             GBM_FORMAT_XRGB8888,
                             GBM_BO_USE_RENDERING);
@@ -918,7 +922,7 @@ _cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
 #endif
   handle = gbm_bo_get_handle (kms_onscreen->next_bo).u32;
 
-  if (drmModeAddFB (kms_renderer->fd,
+  if (drmModeAddFB (kms_renderer->card_device.fd,
                     kms_display->width,
                     kms_display->height,
                     24, /* depth */
@@ -950,7 +954,7 @@ _cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
 
   if (flip->pending == 0)
     {
-      drmModeRmFB (kms_renderer->fd, kms_onscreen->next_fb_id);
+      drmModeRmFB (kms_renderer->card_device.fd, kms_onscreen->next_fb_id);
       gbm_surface_release_buffer (kms_onscreen->surface,
                                   kms_onscreen->next_bo);
       kms_onscreen->next_bo = NULL;
@@ -1025,7 +1029,7 @@ _cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
   egl_onscreen->platform = kms_onscreen;
 
   kms_onscreen->surface =
-    gbm_surface_create (kms_renderer->gbm,
+    gbm_surface_create (kms_renderer->card_device.gbm,
                         kms_display->width,
                         kms_display->height,
                         GBM_BO_FORMAT_XRGB8888,
@@ -1167,7 +1171,7 @@ cogl_kms_renderer_get_gbm (CoglRenderer *renderer)
     {
       CoglRendererEGL *egl_renderer = renderer->winsys;
       CoglRendererKMS *kms_renderer = egl_renderer->platform;
-      return kms_renderer->gbm;
+      return kms_renderer->card_device.gbm;
     }
     else
       return NULL;
@@ -1182,7 +1186,7 @@ cogl_kms_renderer_get_kms_fd (CoglRenderer *renderer)
     {
       CoglRendererEGL *egl_renderer = renderer->winsys;
       CoglRendererKMS *kms_renderer = egl_renderer->platform;
-      return kms_renderer->fd;
+      return kms_renderer->card_device.fd;
     }
   else
     return -1;
@@ -1226,7 +1230,7 @@ cogl_kms_display_set_layout (CoglDisplay *display,
 
       /* Need to drop the GBM surface and create a new one */
 
-      new_surface = gbm_surface_create (kms_renderer->gbm,
+      new_surface = gbm_surface_create (kms_renderer->card_device.gbm,
                                         width, height,
                                         GBM_BO_FORMAT_XRGB8888,
                                         GBM_BO_USE_SCANOUT |