drm/fb-cma-helper: Add fb_deferred_io support
authorNoralf Trønnes <noralf@tronnes.org>
Thu, 28 Apr 2016 15:18:35 +0000 (17:18 +0200)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Mon, 2 May 2016 14:25:08 +0000 (16:25 +0200)
This adds fbdev deferred io support if CONFIG_FB_DEFERRED_IO is enabled.
The driver has to provide a (struct drm_framebuffer_funcs *)->dirty()
callback to get notification of fbdev framebuffer changes.
If the dirty() hook is set, then fb_deferred_io is set up automatically
by the helper.

Two functions have been added so that the driver can provide a dirty()
function:
- drm_fbdev_cma_init_with_funcs()
  This makes it possible for the driver to provided a custom
  (struct drm_fb_helper_funcs *)->fb_probe() function.
- drm_fbdev_cma_create_with_funcs()
  This is used by the .fb_probe hook to set a driver provided
  (struct drm_framebuffer_funcs *)->dirty() function.

Cc: laurent.pinchart@ideasonboard.com
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1461856717-6476-6-git-send-email-noralf@tronnes.org
drivers/gpu/drm/drm_fb_cma_helper.c
include/drm/drm_fb_cma_helper.h

index bb88e3df925712e52af66869e4a23563221dc36c..086f600a975a8861e1483a60be19ea464ab0a92e 100644 (file)
@@ -25,6 +25,8 @@
 #include <drm/drm_fb_cma_helper.h>
 #include <linux/module.h>
 
+#define DEFAULT_FBDEFIO_DELAY_MS 50
+
 struct drm_fb_cma {
        struct drm_framebuffer          fb;
        struct drm_gem_cma_object       *obj[4];
@@ -35,6 +37,61 @@ struct drm_fbdev_cma {
        struct drm_fb_cma       *fb;
 };
 
+/**
+ * DOC: framebuffer cma helper functions
+ *
+ * Provides helper functions for creating a cma (contiguous memory allocator)
+ * backed framebuffer.
+ *
+ * drm_fb_cma_create() is used in the
+ * (struct drm_mode_config_funcs *)->fb_create callback function to create the
+ * cma backed framebuffer.
+ *
+ * An fbdev framebuffer backed by cma is also available by calling
+ * drm_fbdev_cma_init(). drm_fbdev_cma_fini() tears it down.
+ * If CONFIG_FB_DEFERRED_IO is enabled and the callback
+ * (struct drm_framebuffer_funcs)->dirty is set, fb_deferred_io
+ * will be set up automatically. dirty() is called by
+ * drm_fb_helper_deferred_io() in process context (struct delayed_work).
+ *
+ * Example fbdev deferred io code:
+ *
+ *     static int driver_fbdev_fb_dirty(struct drm_framebuffer *fb,
+ *                                      struct drm_file *file_priv,
+ *                                      unsigned flags, unsigned color,
+ *                                      struct drm_clip_rect *clips,
+ *                                      unsigned num_clips)
+ *     {
+ *         struct drm_gem_cma_object *cma = drm_fb_cma_get_gem_obj(fb, 0);
+ *         ... push changes ...
+ *         return 0;
+ *     }
+ *
+ *     static struct drm_framebuffer_funcs driver_fbdev_fb_funcs = {
+ *         .destroy       = drm_fb_cma_destroy,
+ *         .create_handle = drm_fb_cma_create_handle,
+ *         .dirty         = driver_fbdev_fb_dirty,
+ *     };
+ *
+ *     static int driver_fbdev_create(struct drm_fb_helper *helper,
+ *             struct drm_fb_helper_surface_size *sizes)
+ *     {
+ *         return drm_fbdev_cma_create_with_funcs(helper, sizes,
+ *                                                &driver_fbdev_fb_funcs);
+ *     }
+ *
+ *     static const struct drm_fb_helper_funcs driver_fb_helper_funcs = {
+ *         .fb_probe = driver_fbdev_create,
+ *     };
+ *
+ *     Initialize:
+ *     fbdev = drm_fbdev_cma_init_with_funcs(dev, 16,
+ *                                           dev->mode_config.num_crtc,
+ *                                           dev->mode_config.num_connector,
+ *                                           &driver_fb_helper_funcs);
+ *
+ */
+
 static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
 {
        return container_of(helper, struct drm_fbdev_cma, fb_helper);
@@ -45,7 +102,7 @@ static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
        return container_of(fb, struct drm_fb_cma, fb);
 }
 
-static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
+void drm_fb_cma_destroy(struct drm_framebuffer *fb)
 {
        struct drm_fb_cma *fb_cma = to_fb_cma(fb);
        int i;
@@ -58,8 +115,9 @@ static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
        drm_framebuffer_cleanup(fb);
        kfree(fb_cma);
 }
+EXPORT_SYMBOL(drm_fb_cma_destroy);
 
-static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
+int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
        struct drm_file *file_priv, unsigned int *handle)
 {
        struct drm_fb_cma *fb_cma = to_fb_cma(fb);
@@ -67,6 +125,7 @@ static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
        return drm_gem_handle_create(file_priv,
                        &fb_cma->obj[0]->base, handle);
 }
+EXPORT_SYMBOL(drm_fb_cma_create_handle);
 
 static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
        .destroy        = drm_fb_cma_destroy,
@@ -76,7 +135,7 @@ static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
 static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
        const struct drm_mode_fb_cmd2 *mode_cmd,
        struct drm_gem_cma_object **obj,
-       unsigned int num_planes)
+       unsigned int num_planes, struct drm_framebuffer_funcs *funcs)
 {
        struct drm_fb_cma *fb_cma;
        int ret;
@@ -91,7 +150,7 @@ static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
        for (i = 0; i < num_planes; i++)
                fb_cma->obj[i] = obj[i];
 
-       ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
+       ret = drm_framebuffer_init(dev, &fb_cma->fb, funcs);
        if (ret) {
                dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
                kfree(fb_cma);
@@ -145,7 +204,7 @@ struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
                objs[i] = to_drm_gem_cma_obj(obj);
        }
 
-       fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
+       fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, &drm_fb_cma_funcs);
        if (IS_ERR(fb_cma)) {
                ret = PTR_ERR(fb_cma);
                goto err_gem_object_unreference;
@@ -233,8 +292,67 @@ static struct fb_ops drm_fbdev_cma_ops = {
        .fb_setcmap     = drm_fb_helper_setcmap,
 };
 
-static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
-       struct drm_fb_helper_surface_size *sizes)
+static int drm_fbdev_cma_deferred_io_mmap(struct fb_info *info,
+                                         struct vm_area_struct *vma)
+{
+       fb_deferred_io_mmap(info, vma);
+       vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+
+       return 0;
+}
+
+static int drm_fbdev_cma_defio_init(struct fb_info *fbi,
+                                   struct drm_gem_cma_object *cma_obj)
+{
+       struct fb_deferred_io *fbdefio;
+       struct fb_ops *fbops;
+
+       /*
+        * Per device structures are needed because:
+        * fbops: fb_deferred_io_cleanup() clears fbops.fb_mmap
+        * fbdefio: individual delays
+        */
+       fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
+       fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
+       if (!fbdefio || !fbops) {
+               kfree(fbdefio);
+               return -ENOMEM;
+       }
+
+       /* can't be offset from vaddr since dirty() uses cma_obj */
+       fbi->screen_buffer = cma_obj->vaddr;
+       /* fb_deferred_io_fault() needs a physical address */
+       fbi->fix.smem_start = page_to_phys(virt_to_page(fbi->screen_buffer));
+
+       *fbops = *fbi->fbops;
+       fbi->fbops = fbops;
+
+       fbdefio->delay = msecs_to_jiffies(DEFAULT_FBDEFIO_DELAY_MS);
+       fbdefio->deferred_io = drm_fb_helper_deferred_io;
+       fbi->fbdefio = fbdefio;
+       fb_deferred_io_init(fbi);
+       fbi->fbops->fb_mmap = drm_fbdev_cma_deferred_io_mmap;
+
+       return 0;
+}
+
+static void drm_fbdev_cma_defio_fini(struct fb_info *fbi)
+{
+       if (!fbi->fbdefio)
+               return;
+
+       fb_deferred_io_cleanup(fbi);
+       kfree(fbi->fbdefio);
+       kfree(fbi->fbops);
+}
+
+/*
+ * For use in a (struct drm_fb_helper_funcs *)->fb_probe callback function that
+ * needs custom struct drm_framebuffer_funcs, like dirty() for deferred_io use.
+ */
+int drm_fbdev_cma_create_with_funcs(struct drm_fb_helper *helper,
+       struct drm_fb_helper_surface_size *sizes,
+       struct drm_framebuffer_funcs *funcs)
 {
        struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
        struct drm_mode_fb_cmd2 mode_cmd = { 0 };
@@ -270,7 +388,7 @@ static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
                goto err_gem_free_object;
        }
 
-       fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
+       fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1, funcs);
        if (IS_ERR(fbdev_cma->fb)) {
                dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
                ret = PTR_ERR(fbdev_cma->fb);
@@ -296,31 +414,48 @@ static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
        fbi->screen_size = size;
        fbi->fix.smem_len = size;
 
+       if (funcs->dirty) {
+               ret = drm_fbdev_cma_defio_init(fbi, obj);
+               if (ret)
+                       goto err_cma_destroy;
+       }
+
        return 0;
 
+err_cma_destroy:
+       drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
+       drm_fb_cma_destroy(&fbdev_cma->fb->fb);
 err_fb_info_destroy:
        drm_fb_helper_release_fbi(helper);
 err_gem_free_object:
        dev->driver->gem_free_object(&obj->base);
        return ret;
 }
+EXPORT_SYMBOL(drm_fbdev_cma_create_with_funcs);
+
+static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
+       struct drm_fb_helper_surface_size *sizes)
+{
+       return drm_fbdev_cma_create_with_funcs(helper, sizes, &drm_fb_cma_funcs);
+}
 
 static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
        .fb_probe = drm_fbdev_cma_create,
 };
 
 /**
- * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
+ * drm_fbdev_cma_init_with_funcs() - Allocate and initializes a drm_fbdev_cma struct
  * @dev: DRM device
  * @preferred_bpp: Preferred bits per pixel for the device
  * @num_crtc: Number of CRTCs
  * @max_conn_count: Maximum number of connectors
+ * @funcs: fb helper functions, in particular fb_probe()
  *
  * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
  */
-struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
+struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
        unsigned int preferred_bpp, unsigned int num_crtc,
-       unsigned int max_conn_count)
+       unsigned int max_conn_count, const struct drm_fb_helper_funcs *funcs)
 {
        struct drm_fbdev_cma *fbdev_cma;
        struct drm_fb_helper *helper;
@@ -334,7 +469,7 @@ struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
 
        helper = &fbdev_cma->fb_helper;
 
-       drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);
+       drm_fb_helper_prepare(dev, helper, funcs);
 
        ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
        if (ret < 0) {
@@ -364,6 +499,24 @@ err_free:
 
        return ERR_PTR(ret);
 }
+EXPORT_SYMBOL_GPL(drm_fbdev_cma_init_with_funcs);
+
+/**
+ * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
+ * @dev: DRM device
+ * @preferred_bpp: Preferred bits per pixel for the device
+ * @num_crtc: Number of CRTCs
+ * @max_conn_count: Maximum number of connectors
+ *
+ * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
+ */
+struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
+       unsigned int preferred_bpp, unsigned int num_crtc,
+       unsigned int max_conn_count)
+{
+       return drm_fbdev_cma_init_with_funcs(dev, preferred_bpp, num_crtc,
+                               max_conn_count, &drm_fb_cma_helper_funcs);
+}
 EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
 
 /**
@@ -373,6 +526,7 @@ EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
 void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
 {
        drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
+       drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
        drm_fb_helper_release_fbi(&fbdev_cma->fb_helper);
 
        if (fbdev_cma->fb) {
index be62bd321e759a13b16441a00ebd877cd820b6b6..6554b6f38bb4175cd2cb15a6528217d39704f63b 100644 (file)
@@ -4,11 +4,18 @@
 struct drm_fbdev_cma;
 struct drm_gem_cma_object;
 
+struct drm_fb_helper_surface_size;
+struct drm_framebuffer_funcs;
+struct drm_fb_helper_funcs;
 struct drm_framebuffer;
+struct drm_fb_helper;
 struct drm_device;
 struct drm_file;
 struct drm_mode_fb_cmd2;
 
+struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
+       unsigned int preferred_bpp, unsigned int num_crtc,
+       unsigned int max_conn_count, const struct drm_fb_helper_funcs *funcs);
 struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
        unsigned int preferred_bpp, unsigned int num_crtc,
        unsigned int max_conn_count);
@@ -16,6 +23,13 @@ void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma);
 
 void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma);
 void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma);
+int drm_fbdev_cma_create_with_funcs(struct drm_fb_helper *helper,
+       struct drm_fb_helper_surface_size *sizes,
+       struct drm_framebuffer_funcs *funcs);
+
+void drm_fb_cma_destroy(struct drm_framebuffer *fb);
+int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
+       struct drm_file *file_priv, unsigned int *handle);
 
 struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
        struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd);