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Code Issues Releases Wiki Activity

drm/cma-helper: Use the generic fbdev emulation

Browse source 
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@ideasonboard.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180703160354.59955-5-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes 2018-07-03 18:03:50 +02:00
parent 244007ecb6
commit 894a677f4b
2 changed files with 42 additions and 321 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

360
drivers/gpu/drm/drm_fb_cma_helper.c
View file

@ -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);

3
include/drm/drm_fb_cma_helper.h
View file

@ -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);