[RFC xserver v4 06/14] modesetting: Add support for multi-plane pixmaps when page-flipping

[Louis-Francis Ratté-Boulianne]

This allows the uses of CCS compressed or tiled pixmaps as BOs when
page-flipping.

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb at collabora.com>
---
 hw/xfree86/drivers/modesetting/drmmode_display.c | 46 ++++++++++++++++++++++++
 hw/xfree86/drivers/modesetting/drmmode_display.h |  4 +++
 hw/xfree86/drivers/modesetting/pageflip.c        | 16 +++++----
 3 files changed, 59 insertions(+), 7 deletions(-)

diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
index 9f239ea49..5d9770bb7 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
@@ -39,6 +39,8 @@
 #include "micmap.h"
 #include "xf86cmap.h"
 #include "xf86DDC.h"
+#include <drm_fourcc.h>
+#include <drm_mode.h>
 
 #include <xf86drm.h>
 #include "xf86Crtc.h"
@@ -388,10 +390,54 @@ drmmode_bo_map(drmmode_ptr drmmode, drmmode_bo *bo)
     return bo->dumb->ptr;
 }
 
+int
+drmmode_bo_import(drmmode_ptr drmmode, drmmode_bo *bo,
+                  uint32_t *fb_id)
+{
+#ifdef GBM_BO_WITH_MODIFIERS
+    if (bo->gbm) {
+        int num_fds;
+
+        num_fds = gbm_bo_get_plane_count(bo->gbm);
+        if (num_fds > 0) {
+            int i;
+            uint32_t handles[4];
+            uint32_t strides[4];
+            uint32_t offsets[4];
+            uint64_t modifiers[4];
+
+            memset(handles, 0, sizeof(handles));
+            memset(strides, 0, sizeof(strides));
+            memset(offsets, 0, sizeof(offsets));
+            memset(modifiers, 0, sizeof(modifiers));
+
+            for (i = 0; i < num_fds; i++) {
+                handles[i] = gbm_bo_get_handle_for_plane(bo->gbm, i).u32;
+                strides[i] = gbm_bo_get_stride_for_plane(bo->gbm, i);
+                offsets[i] = gbm_bo_get_offset(bo->gbm, i);
+                modifiers[i] = gbm_bo_get_modifier(bo->gbm);
+            }
+
+            return drmModeAddFB2WithModifiers(drmmode->fd, bo->width, bo->height,
+                                              DRM_FORMAT_ARGB8888, handles, strides,
+                                              offsets, modifiers, fb_id,
+                                              DRM_MODE_FB_MODIFIERS);
+        }
+    }
+#endif
+    return drmModeAddFB(drmmode->fd, bo->width, bo->height,
+                        drmmode->scrn->depth, drmmode->scrn->bitsPerPixel,
+                        drmmode_bo_get_pitch(bo),
+                        drmmode_bo_get_handle(bo), fb_id);
+}
+
 static Bool
 drmmode_create_bo(drmmode_ptr drmmode, drmmode_bo *bo,
                   unsigned width, unsigned height, unsigned bpp)
 {
+    bo->width = width;
+    bo->height = height;
+
 #ifdef GLAMOR_HAS_GBM
     if (drmmode->glamor) {
         bo->gbm = gbm_bo_create(drmmode->gbm, width, height,
diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.h b/hw/xfree86/drivers/modesetting/drmmode_display.h
index c09757f51..ca83eae4b 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.h
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.h
@@ -51,6 +51,8 @@ enum drmmode_plane_type {
 };
 
 typedef struct {
+    uint32_t width;
+    uint32_t height;
     struct dumb_bo *dumb;
 #ifdef GLAMOR_HAS_GBM
     struct gbm_bo *gbm;
@@ -193,6 +195,8 @@ extern DevPrivateKeyRec msPixmapPrivateKeyRec;
 
 #define msGetPixmapPriv(drmmode, p) ((msPixmapPrivPtr)dixGetPrivateAddr(&(p)->devPrivates, &(drmmode)->pixmapPrivateKeyRec))
 
+int drmmode_bo_import(drmmode_ptr drmmode, drmmode_bo *bo,
+                      uint32_t *fb_id);
 int drmmode_bo_destroy(drmmode_ptr drmmode, drmmode_bo *bo);
 uint32_t drmmode_bo_get_pitch(drmmode_bo *bo);
 uint32_t drmmode_bo_get_handle(drmmode_bo *bo);
diff --git a/hw/xfree86/drivers/modesetting/pageflip.c b/hw/xfree86/drivers/modesetting/pageflip.c
index dd296cd12..027ebfe42 100644
--- a/hw/xfree86/drivers/modesetting/pageflip.c
+++ b/hw/xfree86/drivers/modesetting/pageflip.c
@@ -258,6 +258,7 @@ ms_do_pageflip(ScreenPtr screen,
 
     new_front_bo.gbm = glamor_gbm_bo_from_pixmap(screen, new_front);
     new_front_bo.dumb = NULL;
+
     if (!new_front_bo.gbm) {
         xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                    "Failed to get GBM bo for flip to new front.\n");
@@ -288,14 +289,12 @@ ms_do_pageflip(ScreenPtr screen,
 
     /* Create a new handle for the back buffer */
     flipdata->old_fb_id = ms->drmmode.fb_id;
-    if (drmModeAddFB(ms->fd, scrn->virtualX, scrn->virtualY,
-                     scrn->depth, scrn->bitsPerPixel,
-                     drmmode_bo_get_pitch(&new_front_bo),
-                     drmmode_bo_get_handle(&new_front_bo), &ms->drmmode.fb_id)) {
-        goto error_out;
-    }
 
-    drmmode_bo_destroy(&ms->drmmode, &new_front_bo);
+    new_front_bo.width = new_front->drawable.width;
+    new_front_bo.height = new_front->drawable.height;
+    if (drmmode_bo_import(&ms->drmmode, &new_front_bo,
+                          &ms->drmmode.fb_id))
+        goto error_out;
 
     flags = DRM_MODE_PAGE_FLIP_EVENT;
     if (async)
@@ -323,6 +322,8 @@ ms_do_pageflip(ScreenPtr screen,
         }
     }
 
+    drmmode_bo_destroy(&ms->drmmode, &new_front_bo);
+
     /*
      * Do we have more than our local reference,
      * if so and no errors, then drop our local
@@ -348,6 +349,7 @@ error_undo:
 error_out:
     xf86DrvMsg(scrn->scrnIndex, X_WARNING, "Page flip failed: %s\n",
                strerror(errno));
+    drmmode_bo_destroy(&ms->drmmode, &new_front_bo);
     /* if only the local reference - free the structure,
      * else drop the local reference and return */
     if (flipdata->flip_count == 1)
-- 
2.13.0