intel_fb.c

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/*
 * Copyright © 2007 David Airlie
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *     David Airlie
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/vga_switcheroo.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"

static struct fb_ops intelfb_ops = {
    .owner = THIS_MODULE,
    .fb_check_var = drm_fb_helper_check_var,
    .fb_set_par = drm_fb_helper_set_par,
    .fb_fillrect = cfb_fillrect,
    .fb_copyarea = cfb_copyarea,
    .fb_imageblit = cfb_imageblit,
    .fb_pan_display = drm_fb_helper_pan_display,
    .fb_blank = drm_fb_helper_blank,
    .fb_setcmap = drm_fb_helper_setcmap,
    .fb_debug_enter = drm_fb_helper_debug_enter,
    .fb_debug_leave = drm_fb_helper_debug_leave,
};

static int intelfb_create(struct intel_fbdev *ifbdev,
              struct drm_fb_helper_surface_size *sizes)
{
    struct drm_device *dev = ifbdev->helper.dev;
    struct drm_i915_private *dev_priv = dev->dev_private;
    struct fb_info *info;
    struct drm_framebuffer *fb;
    struct drm_mode_fb_cmd2 mode_cmd = {};
    struct drm_i915_gem_object *obj;
    struct device *device = &dev->pdev->dev;
    int size, ret;

    /* we don't do packed 24bpp */
    if (sizes->surface_bpp == 24)
        sizes->surface_bpp = 32;

    mode_cmd.width = sizes->surface_width;
    mode_cmd.height = sizes->surface_height;

    mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((sizes->surface_bpp + 7) /
                              8), 64);
    mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
                              sizes->surface_depth);

    size = mode_cmd.pitches[0] * mode_cmd.height;
    size = ALIGN(size, PAGE_SIZE);
    obj = i915_gem_alloc_object(dev, size);
    if (!obj) {
        DRM_ERROR("failed to allocate framebuffer\n");
        ret = -ENOMEM;
        goto out;
    }

    mutex_lock(&dev->struct_mutex);

    /* Flush everything out, we'll be doing GTT only from now on */
    ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
    if (ret) {
        DRM_ERROR("failed to pin fb: %d\n", ret);
        goto out_unref;
    }

    info = framebuffer_alloc(0, device);
    if (!info) {
        ret = -ENOMEM;
        goto out_unpin;
    }

    info->par = ifbdev;

    ret = intel_framebuffer_init(dev, &ifbdev->ifb, &mode_cmd, obj);
    if (ret)
        goto out_unpin;

    fb = &ifbdev->ifb.base;

    ifbdev->helper.fb = fb;
    ifbdev->helper.fbdev = info;

    strcpy(info->fix.id, "inteldrmfb");

    info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
    info->fbops = &intelfb_ops;

    ret = fb_alloc_cmap(&info->cmap, 256, 0);
    if (ret) {
        ret = -ENOMEM;
        goto out_unpin;
    }
    /* setup aperture base/size for vesafb takeover */
    info->apertures = alloc_apertures(1);
    if (!info->apertures) {
        ret = -ENOMEM;
        goto out_unpin;
    }
    info->apertures->ranges[0].base = dev->mode_config.fb_base;
    info->apertures->ranges[0].size =
        dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;

    info->fix.smem_start = dev->mode_config.fb_base + obj->gtt_offset;
    info->fix.smem_len = size;

    info->screen_base =
        ioremap_wc(dev_priv->mm.gtt_base_addr + obj->gtt_offset,
               size);
    if (!info->screen_base) {
        ret = -ENOSPC;
        goto out_unpin;
    }
    info->screen_size = size;

//  memset(info->screen_base, 0, size);

    drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
    drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);

    /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */

    DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x, bo %p\n",
              fb->width, fb->height,
              obj->gtt_offset, obj);


    mutex_unlock(&dev->struct_mutex);
    vga_switcheroo_client_fb_set(dev->pdev, info);
    return 0;

out_unpin:
    i915_gem_object_unpin(obj);
out_unref:
    drm_gem_object_unreference(&obj->base);
    mutex_unlock(&dev->struct_mutex);
out:
    return ret;
}

static int intel_fb_find_or_create_single(struct drm_fb_helper *helper,
                      struct drm_fb_helper_surface_size *sizes)
{
    struct intel_fbdev *ifbdev = (struct intel_fbdev *)helper;
    int new_fb = 0;
    int ret;

    if (!helper->fb) {
        ret = intelfb_create(ifbdev, sizes);
        if (ret)
            return ret;
        new_fb = 1;
    }
    return new_fb;
}

static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
    .gamma_set = intel_crtc_fb_gamma_set,
    .gamma_get = intel_crtc_fb_gamma_get,
    .fb_probe = intel_fb_find_or_create_single,
};

static void intel_fbdev_destroy(struct drm_device *dev,
                struct intel_fbdev *ifbdev)
{
    struct fb_info *info;
    struct intel_framebuffer *ifb = &ifbdev->ifb;

    if (ifbdev->helper.fbdev) {
        info = ifbdev->helper.fbdev;
        unregister_framebuffer(info);
        iounmap(info->screen_base);
        if (info->cmap.len)
            fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
    }

    drm_fb_helper_fini(&ifbdev->helper);

    drm_framebuffer_cleanup(&ifb->base);
    if (ifb->obj) {
        drm_gem_object_unreference_unlocked(&ifb->obj->base);
        ifb->obj = NULL;
    }
}

int intel_fbdev_init(struct drm_device *dev)
{
    struct intel_fbdev *ifbdev;
    drm_i915_private_t *dev_priv = dev->dev_private;
    int ret;

    ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
    if (!ifbdev)
        return -ENOMEM;

    dev_priv->fbdev = ifbdev;
    ifbdev->helper.funcs = &intel_fb_helper_funcs;

    ret = drm_fb_helper_init(dev, &ifbdev->helper,
                 dev_priv->num_pipe,
                 INTELFB_CONN_LIMIT);
    if (ret) {
        kfree(ifbdev);
        return ret;
    }

    drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
    drm_fb_helper_initial_config(&ifbdev->helper, 32);
    return 0;
}

void intel_fbdev_fini(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    if (!dev_priv->fbdev)
        return;

    intel_fbdev_destroy(dev, dev_priv->fbdev);
    kfree(dev_priv->fbdev);
    dev_priv->fbdev = NULL;
}

void intel_fbdev_set_suspend(struct drm_device *dev, int state)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    if (!dev_priv->fbdev)
        return;

    fb_set_suspend(dev_priv->fbdev->helper.fbdev, state);
}

MODULE_LICENSE("GPL and additional rights");

void intel_fb_output_poll_changed(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
}

void intel_fb_restore_mode(struct drm_device *dev)
{
    int ret;
    drm_i915_private_t *dev_priv = dev->dev_private;
    struct drm_mode_config *config = &dev->mode_config;
    struct drm_plane *plane;

    mutex_lock(&dev->mode_config.mutex);

    ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
    if (ret)
        DRM_DEBUG("failed to restore crtc mode\n");

    /* Be sure to shut off any planes that may be active */
    list_for_each_entry(plane, &config->plane_list, head)
        plane->funcs->disable_plane(plane);

    mutex_unlock(&dev->mode_config.mutex);
}