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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*/
#include <linux/fb.h>
#include <drm/drm_drv.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_file.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_prime.h>
#include "msm_drv.h"
#include "msm_gem.h"
#include "msm_kms.h"
static bool fbdev = true;
MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
module_param(fbdev, bool, 0600);
/*
* fbdev funcs, to implement legacy fbdev interface on top of drm driver
*/
FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,
drm_fb_helper_damage_range,
drm_fb_helper_damage_area)
static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
return drm_gem_prime_mmap(bo, vma);
}
static void msm_fbdev_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
DBG();
drm_fb_helper_fini(helper);
msm_gem_put_vaddr(bo);
drm_client_buffer_delete(helper->buffer);
drm_client_release(&helper->client);
}
static const struct fb_ops msm_fb_ops = {
.owner = THIS_MODULE,
__FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev),
DRM_FB_HELPER_DEFAULT_OPS,
__FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev),
.fb_mmap = msm_fbdev_mmap,
.fb_destroy = msm_fbdev_fb_destroy,
};
static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper,
struct drm_clip_rect *clip)
{
struct drm_device *dev = helper->dev;
int ret;
/* Call damage handlers only if necessary */
if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
return 0;
if (helper->fb->funcs->dirty) {
ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
return ret;
}
return 0;
}
static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = {
.fb_dirty = msm_fbdev_fb_dirty,
};
int msm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes)
{
struct drm_client_dev *client = &helper->client;
struct drm_device *dev = client->dev;
struct drm_file *file = client->file;
struct msm_drm_private *priv = dev->dev_private;
struct fb_info *fbi = helper->info;
const struct drm_format_info *format;
u32 fourcc, pitch, handle;
u64 size;
struct drm_gem_object *bo;
struct drm_client_buffer *buffer;
uint64_t paddr;
int ret;
DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
sizes->surface_height, sizes->surface_bpp,
sizes->fb_width, sizes->fb_height);
fourcc = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
format = drm_get_format_info(dev, fourcc, DRM_FORMAT_MOD_LINEAR);
/* adreno needs pitch aligned to 32 pixels: */
pitch = drm_format_info_min_pitch(format, 0, ALIGN(sizes->surface_width, 32));
size = ALIGN(pitch * sizes->surface_height, PAGE_SIZE);
/* allocate backing bo */
DBG("allocating %llu bytes for fb %d", size, dev->primary->index);
bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN, NULL);
if (IS_ERR(bo)) {
drm_warn(dev, "could not allocate stolen bo\n");
/* try regular bo: */
bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC, NULL);
if (IS_ERR(bo)) {
drm_err(dev, "failed to allocate buffer object\n");
return PTR_ERR(bo);
}
}
msm_gem_object_set_name(bo, "stolenfb");
ret = drm_gem_handle_create(file, bo, &handle);
if (ret)
goto err_drm_gem_object_put;
buffer = drm_client_buffer_create(client, sizes->surface_width, sizes->surface_height,
fourcc, handle, pitch);
if (IS_ERR(buffer)) {
ret = PTR_ERR(buffer);
goto err_drm_gem_handle_delete;
}
/*
* NOTE: if we can be guaranteed to be able to map buffer
* in panic (ie. lock-safe, etc) we could avoid pinning the
* buffer now:
*/
ret = msm_gem_get_and_pin_iova(bo, priv->kms->vm, &paddr);
if (ret) {
drm_err(dev, "failed to get buffer obj iova: %d\n", ret);
goto err_drm_client_buffer_delete;
}
DBG("fbi=%p, dev=%p", fbi, dev);
helper->funcs = &msm_fbdev_helper_funcs;
helper->buffer = buffer;
helper->fb = buffer->fb;
fbi->fbops = &msm_fb_ops;
drm_fb_helper_fill_info(fbi, helper, sizes);
fbi->screen_buffer = msm_gem_get_vaddr(bo);
if (IS_ERR(fbi->screen_buffer)) {
ret = PTR_ERR(fbi->screen_buffer);
goto err_msm_gem_unpin;
}
fbi->screen_size = bo->size;
fbi->fix.smem_start = paddr;
fbi->fix.smem_len = bo->size;
DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
DBG("allocated %dx%d fb", buffer->fb->width, buffer->fb->height);
/* The handle is only needed for creating the framebuffer. */
drm_gem_handle_delete(file, handle);
/* The framebuffer still holds a reference on the GEM object. */
drm_gem_object_put(bo);
return 0;
err_msm_gem_unpin:
msm_gem_unpin_iova(bo, priv->kms->vm);
msm_gem_vma_put(bo);
err_drm_client_buffer_delete:
drm_client_buffer_delete(buffer);
err_drm_gem_handle_delete:
drm_gem_handle_delete(file, handle);
err_drm_gem_object_put:
drm_gem_object_put(bo);
return ret;
}
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