[PATCH v5 4/8] drm/cma-helper: Use the generic fbdev emulation
Noralf Trønnes
noralf at tronnes.org
Tue Jul 3 16:03:50 UTC 2018
This switches the CMA helper drivers that use its fbdev emulation over
to the generic fbdev emulation. It's the first phase of using generic
fbdev. A later phase will use DRM client callbacks for the
lastclose/hotplug/remove callbacks.
There are currently 2 fbdev init/fini functions:
- drm_fb_cma_fbdev_init/drm_fb_cma_fbdev_fini
- drm_fbdev_cma_init/drm_fbdev_cma_fini
This is because the work on generic fbdev came up during a fbdev
refactoring and thus wasn't completed. No point in completing that
refactoring when drivers will soon move to drm_fb_helper_generic_probe().
tinydrm uses drm_fb_cma_fbdev_init_with_funcs().
Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/drm_fb_cma_helper.c | 360 +++++-------------------------------
include/drm/drm_fb_cma_helper.h | 3 -
2 files changed, 42 insertions(+), 321 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index 186d00adfb5f..718c7f961d8a 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -18,6 +18,7 @@
*/
#include <drm/drmP.h>
+#include <drm/drm_client.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_cma_helper.h>
@@ -26,11 +27,8 @@
#include <drm/drm_print.h>
#include <linux/module.h>
-#define DEFAULT_FBDEFIO_DELAY_MS 50
-
struct drm_fbdev_cma {
struct drm_fb_helper fb_helper;
- const struct drm_framebuffer_funcs *fb_funcs;
};
/**
@@ -44,36 +42,6 @@ struct drm_fbdev_cma {
*
* An fbdev framebuffer backed by cma is also available by calling
* drm_fb_cma_fbdev_init(). drm_fb_cma_fbdev_fini() tears it down.
- * If the &drm_framebuffer_funcs.dirty callback is set, fb_deferred_io will be
- * set up automatically. &drm_framebuffer_funcs.dirty is called by
- * drm_fb_helper_deferred_io() in process context (&struct delayed_work).
- *
- * Example fbdev deferred io code::
- *
- * static int driver_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_fb_funcs = {
- * .destroy = drm_gem_fb_destroy,
- * .create_handle = drm_gem_fb_create_handle,
- * .dirty = driver_fb_dirty,
- * };
- *
- * Initialize::
- *
- * fbdev = drm_fb_cma_fbdev_init_with_funcs(dev, 16,
- * dev->mode_config.num_crtc,
- * dev->mode_config.num_connector,
- * &driver_fb_funcs);
- *
*/
static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
@@ -131,153 +99,6 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
-static int drm_fb_cma_mmap(struct fb_info *info, struct vm_area_struct *vma)
-{
- return dma_mmap_writecombine(info->device, vma, info->screen_base,
- info->fix.smem_start, info->fix.smem_len);
-}
-
-static struct fb_ops drm_fbdev_cma_ops = {
- .owner = THIS_MODULE,
- DRM_FB_HELPER_DEFAULT_OPS,
- .fb_fillrect = drm_fb_helper_sys_fillrect,
- .fb_copyarea = drm_fb_helper_sys_copyarea,
- .fb_imageblit = drm_fb_helper_sys_imageblit,
- .fb_mmap = drm_fb_cma_mmap,
-};
-
-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);
- kfree(fbops);
- 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);
-}
-
-static int
-drm_fbdev_cma_create(struct drm_fb_helper *helper,
- struct drm_fb_helper_surface_size *sizes)
-{
- struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
- struct drm_device *dev = helper->dev;
- struct drm_gem_cma_object *obj;
- struct drm_framebuffer *fb;
- unsigned int bytes_per_pixel;
- unsigned long offset;
- struct fb_info *fbi;
- size_t size;
- int ret;
-
- DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
- sizes->surface_width, sizes->surface_height,
- sizes->surface_bpp);
-
- bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
- size = sizes->surface_width * sizes->surface_height * bytes_per_pixel;
- obj = drm_gem_cma_create(dev, size);
- if (IS_ERR(obj))
- return -ENOMEM;
-
- fbi = drm_fb_helper_alloc_fbi(helper);
- if (IS_ERR(fbi)) {
- ret = PTR_ERR(fbi);
- goto err_gem_free_object;
- }
-
- fb = drm_gem_fbdev_fb_create(dev, sizes, 0, &obj->base,
- fbdev_cma->fb_funcs);
- if (IS_ERR(fb)) {
- dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
- ret = PTR_ERR(fb);
- goto err_fb_info_destroy;
- }
-
- helper->fb = fb;
-
- fbi->par = helper;
- fbi->flags = FBINFO_FLAG_DEFAULT;
- fbi->fbops = &drm_fbdev_cma_ops;
-
- drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
- drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
-
- offset = fbi->var.xoffset * bytes_per_pixel;
- offset += fbi->var.yoffset * fb->pitches[0];
-
- dev->mode_config.fb_base = (resource_size_t)obj->paddr;
- fbi->screen_base = obj->vaddr + offset;
- fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
- fbi->screen_size = size;
- fbi->fix.smem_len = size;
-
- if (fb->funcs->dirty) {
- ret = drm_fbdev_cma_defio_init(fbi, obj);
- if (ret)
- goto err_cma_destroy;
- }
-
- return 0;
-
-err_cma_destroy:
- drm_framebuffer_remove(fb);
-err_fb_info_destroy:
- drm_fb_helper_fini(helper);
-err_gem_free_object:
- drm_gem_object_put_unlocked(&obj->base);
- return ret;
-}
-
-static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
- .fb_probe = drm_fbdev_cma_create,
-};
-
/**
* drm_fb_cma_fbdev_init_with_funcs() - Allocate and initialize fbdev emulation
* @dev: DRM device
@@ -295,53 +116,7 @@ int drm_fb_cma_fbdev_init_with_funcs(struct drm_device *dev,
unsigned int preferred_bpp, unsigned int max_conn_count,
const struct drm_framebuffer_funcs *funcs)
{
- struct drm_fbdev_cma *fbdev_cma;
- struct drm_fb_helper *fb_helper;
- int ret;
-
- if (!preferred_bpp)
- preferred_bpp = dev->mode_config.preferred_depth;
- if (!preferred_bpp)
- preferred_bpp = 32;
-
- if (!max_conn_count)
- max_conn_count = dev->mode_config.num_connector;
-
- fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
- if (!fbdev_cma)
- return -ENOMEM;
-
- fbdev_cma->fb_funcs = funcs;
- fb_helper = &fbdev_cma->fb_helper;
-
- drm_fb_helper_prepare(dev, fb_helper, &drm_fb_cma_helper_funcs);
-
- ret = drm_fb_helper_init(dev, fb_helper, max_conn_count);
- if (ret < 0) {
- DRM_DEV_ERROR(dev->dev, "Failed to initialize fbdev helper.\n");
- goto err_free;
- }
-
- ret = drm_fb_helper_single_add_all_connectors(fb_helper);
- if (ret < 0) {
- DRM_DEV_ERROR(dev->dev, "Failed to add connectors.\n");
- goto err_drm_fb_helper_fini;
- }
-
- ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp);
- if (ret < 0) {
- DRM_DEV_ERROR(dev->dev, "Failed to set fbdev configuration.\n");
- goto err_drm_fb_helper_fini;
- }
-
- return 0;
-
-err_drm_fb_helper_fini:
- drm_fb_helper_fini(fb_helper);
-err_free:
- kfree(fbdev_cma);
-
- return ret;
+ return drm_fb_cma_fbdev_init(dev, preferred_bpp, max_conn_count);
}
EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init_with_funcs);
@@ -359,8 +134,14 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init_with_funcs);
int drm_fb_cma_fbdev_init(struct drm_device *dev, unsigned int preferred_bpp,
unsigned int max_conn_count)
{
- return drm_fb_cma_fbdev_init_with_funcs(dev, preferred_bpp,
- max_conn_count, NULL);
+ struct drm_fbdev_cma *fbdev_cma;
+
+ /* dev->fb_helper will indirectly point to fbdev_cma after this call */
+ fbdev_cma = drm_fbdev_cma_init(dev, preferred_bpp, max_conn_count);
+ if (IS_ERR(fbdev_cma))
+ return PTR_ERR(fbdev_cma);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init);
@@ -370,87 +151,13 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init);
*/
void drm_fb_cma_fbdev_fini(struct drm_device *dev)
{
- struct drm_fb_helper *fb_helper = dev->fb_helper;
-
- if (!fb_helper)
- return;
-
- /* Unregister if it hasn't been done already */
- if (fb_helper->fbdev && fb_helper->fbdev->dev)
- drm_fb_helper_unregister_fbi(fb_helper);
-
- if (fb_helper->fbdev)
- drm_fbdev_cma_defio_fini(fb_helper->fbdev);
-
- if (fb_helper->fb)
- drm_framebuffer_remove(fb_helper->fb);
-
- drm_fb_helper_fini(fb_helper);
- kfree(to_fbdev_cma(fb_helper));
+ if (dev->fb_helper)
+ drm_fbdev_cma_fini(to_fbdev_cma(dev->fb_helper));
}
EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_fini);
-/**
- * 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
- * @max_conn_count: Maximum number of connectors
- * @funcs: fb helper functions, in particular a custom dirty() callback
- *
- * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
- */
-struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
- unsigned int preferred_bpp, unsigned int max_conn_count,
- const struct drm_framebuffer_funcs *funcs)
-{
- struct drm_fbdev_cma *fbdev_cma;
- struct drm_fb_helper *helper;
- int ret;
-
- fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
- if (!fbdev_cma) {
- dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
- return ERR_PTR(-ENOMEM);
- }
- fbdev_cma->fb_funcs = funcs;
-
- helper = &fbdev_cma->fb_helper;
-
- drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);
-
- ret = drm_fb_helper_init(dev, helper, max_conn_count);
- if (ret < 0) {
- dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
- goto err_free;
- }
-
- ret = drm_fb_helper_single_add_all_connectors(helper);
- if (ret < 0) {
- dev_err(dev->dev, "Failed to add connectors.\n");
- goto err_drm_fb_helper_fini;
-
- }
-
- ret = drm_fb_helper_initial_config(helper, preferred_bpp);
- if (ret < 0) {
- dev_err(dev->dev, "Failed to set initial hw configuration.\n");
- goto err_drm_fb_helper_fini;
- }
-
- return fbdev_cma;
-
-err_drm_fb_helper_fini:
- drm_fb_helper_fini(helper);
-err_free:
- kfree(fbdev_cma);
-
- return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(drm_fbdev_cma_init_with_funcs);
-
-static const struct drm_framebuffer_funcs drm_fb_cma_funcs = {
- .destroy = drm_gem_fb_destroy,
- .create_handle = drm_gem_fb_create_handle,
+static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
+ .fb_probe = drm_fb_helper_generic_probe,
};
/**
@@ -464,9 +171,33 @@ static const struct drm_framebuffer_funcs drm_fb_cma_funcs = {
struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
unsigned int preferred_bpp, unsigned int max_conn_count)
{
- return drm_fbdev_cma_init_with_funcs(dev, preferred_bpp,
- max_conn_count,
- &drm_fb_cma_funcs);
+ struct drm_fbdev_cma *fbdev_cma;
+ struct drm_fb_helper *fb_helper;
+ int ret;
+
+ fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
+ if (!fbdev_cma)
+ return ERR_PTR(-ENOMEM);
+
+ fb_helper = &fbdev_cma->fb_helper;
+
+ ret = drm_client_new(dev, &fb_helper->client, "fbdev", NULL);
+ if (ret)
+ goto err_free;
+
+ ret = drm_fb_helper_fbdev_setup(dev, fb_helper, &drm_fb_cma_helper_funcs,
+ preferred_bpp, max_conn_count);
+ if (ret)
+ goto err_client_put;
+
+ return fbdev_cma;
+
+err_client_put:
+ drm_client_release(&fb_helper->client);
+err_free:
+ kfree(fbdev_cma);
+
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
@@ -477,14 +208,7 @@ 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);
- if (fbdev_cma->fb_helper.fbdev)
- drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
-
- if (fbdev_cma->fb_helper.fb)
- drm_framebuffer_remove(fbdev_cma->fb_helper.fb);
-
- drm_fb_helper_fini(&fbdev_cma->fb_helper);
- kfree(fbdev_cma);
+ /* All resources have now been freed by drm_fbdev_fb_destroy() */
}
EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
diff --git a/include/drm/drm_fb_cma_helper.h b/include/drm/drm_fb_cma_helper.h
index d532f88a8d55..a0546c3451f9 100644
--- a/include/drm/drm_fb_cma_helper.h
+++ b/include/drm/drm_fb_cma_helper.h
@@ -23,9 +23,6 @@ int drm_fb_cma_fbdev_init(struct drm_device *dev, unsigned int preferred_bpp,
unsigned int max_conn_count);
void drm_fb_cma_fbdev_fini(struct drm_device *dev);
-struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
- unsigned int preferred_bpp, unsigned int max_conn_count,
- const struct drm_framebuffer_funcs *funcs);
struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
unsigned int preferred_bpp, unsigned int max_conn_count);
void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma);
--
2.15.1
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