nouveau_fbcon.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/screen_info.h>
#include <linux/vga_switcheroo.h>
#include <linux/console.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>

#include "nouveau_drm.h"
#include "nouveau_gem.h"
#include "nouveau_bo.h"
#include "nouveau_fbcon.h"
#include "nouveau_chan.h"

#include "nouveau_crtc.h"

#include <core/client.h>
#include <core/device.h>

#include <subdev/fb.h>

MODULE_PARM_DESC(nofbaccel, "Disable fbcon acceleration");
static int nouveau_nofbaccel = 0;
module_param_named(nofbaccel, nouveau_nofbaccel, int, 0400);

static void
nouveau_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
    struct nouveau_fbdev *fbcon = info->par;
    struct nouveau_drm *drm = nouveau_drm(fbcon->dev);
    struct nouveau_device *device = nv_device(drm->device);
    int ret;

    if (info->state != FBINFO_STATE_RUNNING)
        return;

    ret = -ENODEV;
    if (!in_interrupt() && !(info->flags & FBINFO_HWACCEL_DISABLED) &&
        mutex_trylock(&drm->client.mutex)) {
        if (device->card_type < NV_50)
            ret = nv04_fbcon_fillrect(info, rect);
        else
        if (device->card_type < NV_C0)
            ret = nv50_fbcon_fillrect(info, rect);
        else
            ret = nvc0_fbcon_fillrect(info, rect);
        mutex_unlock(&drm->client.mutex);
    }

    if (ret == 0)
        return;

    if (ret != -ENODEV)
        nouveau_fbcon_gpu_lockup(info);
    cfb_fillrect(info, rect);
}

static void
nouveau_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *image)
{
    struct nouveau_fbdev *fbcon = info->par;
    struct nouveau_drm *drm = nouveau_drm(fbcon->dev);
    struct nouveau_device *device = nv_device(drm->device);
    int ret;

    if (info->state != FBINFO_STATE_RUNNING)
        return;

    ret = -ENODEV;
    if (!in_interrupt() && !(info->flags & FBINFO_HWACCEL_DISABLED) &&
        mutex_trylock(&drm->client.mutex)) {
        if (device->card_type < NV_50)
            ret = nv04_fbcon_copyarea(info, image);
        else
        if (device->card_type < NV_C0)
            ret = nv50_fbcon_copyarea(info, image);
        else
            ret = nvc0_fbcon_copyarea(info, image);
        mutex_unlock(&drm->client.mutex);
    }

    if (ret == 0)
        return;

    if (ret != -ENODEV)
        nouveau_fbcon_gpu_lockup(info);
    cfb_copyarea(info, image);
}

static void
nouveau_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
{
    struct nouveau_fbdev *fbcon = info->par;
    struct nouveau_drm *drm = nouveau_drm(fbcon->dev);
    struct nouveau_device *device = nv_device(drm->device);
    int ret;

    if (info->state != FBINFO_STATE_RUNNING)
        return;

    ret = -ENODEV;
    if (!in_interrupt() && !(info->flags & FBINFO_HWACCEL_DISABLED) &&
        mutex_trylock(&drm->client.mutex)) {
        if (device->card_type < NV_50)
            ret = nv04_fbcon_imageblit(info, image);
        else
        if (device->card_type < NV_C0)
            ret = nv50_fbcon_imageblit(info, image);
        else
            ret = nvc0_fbcon_imageblit(info, image);
        mutex_unlock(&drm->client.mutex);
    }

    if (ret == 0)
        return;

    if (ret != -ENODEV)
        nouveau_fbcon_gpu_lockup(info);
    cfb_imageblit(info, image);
}

static int
nouveau_fbcon_sync(struct fb_info *info)
{
    struct nouveau_fbdev *fbcon = info->par;
    struct nouveau_drm *drm = nouveau_drm(fbcon->dev);
    struct nouveau_channel *chan = drm->channel;
    int ret;

    if (!chan || !chan->accel_done || in_interrupt() ||
        info->state != FBINFO_STATE_RUNNING ||
        info->flags & FBINFO_HWACCEL_DISABLED)
        return 0;

    if (!mutex_trylock(&drm->client.mutex))
        return 0;

    ret = nouveau_channel_idle(chan);
    mutex_unlock(&drm->client.mutex);
    if (ret) {
        nouveau_fbcon_gpu_lockup(info);
        return 0;
    }

    chan->accel_done = false;
    return 0;
}

static struct fb_ops nouveau_fbcon_ops = {
    .owner = THIS_MODULE,
    .fb_check_var = drm_fb_helper_check_var,
    .fb_set_par = drm_fb_helper_set_par,
    .fb_fillrect = nouveau_fbcon_fillrect,
    .fb_copyarea = nouveau_fbcon_copyarea,
    .fb_imageblit = nouveau_fbcon_imageblit,
    .fb_sync = nouveau_fbcon_sync,
    .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 struct fb_ops nouveau_fbcon_sw_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 void nouveau_fbcon_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
                    u16 blue, int regno)
{
    struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

    nv_crtc->lut.r[regno] = red;
    nv_crtc->lut.g[regno] = green;
    nv_crtc->lut.b[regno] = blue;
}

static void nouveau_fbcon_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
                    u16 *blue, int regno)
{
    struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

    *red = nv_crtc->lut.r[regno];
    *green = nv_crtc->lut.g[regno];
    *blue = nv_crtc->lut.b[regno];
}

static void
nouveau_fbcon_zfill(struct drm_device *dev, struct nouveau_fbdev *fbcon)
{
    struct fb_info *info = fbcon->helper.fbdev;
    struct fb_fillrect rect;

    /* Clear the entire fbcon.  The drm will program every connector
     * with it's preferred mode.  If the sizes differ, one display will
     * quite likely have garbage around the console.
     */
    rect.dx = rect.dy = 0;
    rect.width = info->var.xres_virtual;
    rect.height = info->var.yres_virtual;
    rect.color = 0;
    rect.rop = ROP_COPY;
    info->fbops->fb_fillrect(info, &rect);
}

static int
nouveau_fbcon_create(struct nouveau_fbdev *fbcon,
             struct drm_fb_helper_surface_size *sizes)
{
    struct drm_device *dev = fbcon->dev;
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_device *device = nv_device(drm->device);
    struct fb_info *info;
    struct drm_framebuffer *fb;
    struct nouveau_framebuffer *nouveau_fb;
    struct nouveau_channel *chan;
    struct nouveau_bo *nvbo;
    struct drm_mode_fb_cmd2 mode_cmd;
    struct pci_dev *pdev = dev->pdev;
    int size, ret;

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

    mode_cmd.pitches[0] = mode_cmd.width * (sizes->surface_bpp >> 3);
    mode_cmd.pitches[0] = roundup(mode_cmd.pitches[0], 256);

    mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
                              sizes->surface_depth);

    size = mode_cmd.pitches[0] * mode_cmd.height;
    size = roundup(size, PAGE_SIZE);

    ret = nouveau_gem_new(dev, size, 0, NOUVEAU_GEM_DOMAIN_VRAM,
                  0, 0x0000, &nvbo);
    if (ret) {
        NV_ERROR(drm, "failed to allocate framebuffer\n");
        goto out;
    }

    ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_VRAM);
    if (ret) {
        NV_ERROR(drm, "failed to pin fb: %d\n", ret);
        nouveau_bo_ref(NULL, &nvbo);
        goto out;
    }

    ret = nouveau_bo_map(nvbo);
    if (ret) {
        NV_ERROR(drm, "failed to map fb: %d\n", ret);
        nouveau_bo_unpin(nvbo);
        nouveau_bo_ref(NULL, &nvbo);
        goto out;
    }

    chan = nouveau_nofbaccel ? NULL : drm->channel;
    if (chan && device->card_type >= NV_50) {
        ret = nouveau_bo_vma_add(nvbo, nv_client(chan->cli)->vm,
                    &fbcon->nouveau_fb.vma);
        if (ret) {
            NV_ERROR(drm, "failed to map fb into chan: %d\n", ret);
            chan = NULL;
        }
    }

    mutex_lock(&dev->struct_mutex);

    info = framebuffer_alloc(0, &pdev->dev);
    if (!info) {
        ret = -ENOMEM;
        goto out_unref;
    }

    ret = fb_alloc_cmap(&info->cmap, 256, 0);
    if (ret) {
        ret = -ENOMEM;
        goto out_unref;
    }

    info->par = fbcon;

    nouveau_framebuffer_init(dev, &fbcon->nouveau_fb, &mode_cmd, nvbo);

    nouveau_fb = &fbcon->nouveau_fb;
    fb = &nouveau_fb->base;

    /* setup helper */
    fbcon->helper.fb = fb;
    fbcon->helper.fbdev = info;

    strcpy(info->fix.id, "nouveaufb");
    if (nouveau_nofbaccel)
        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_DISABLED;
    else
        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA |
                  FBINFO_HWACCEL_FILLRECT |
                  FBINFO_HWACCEL_IMAGEBLIT;
    info->flags |= FBINFO_CAN_FORCE_OUTPUT;
    info->fbops = &nouveau_fbcon_sw_ops;
    info->fix.smem_start = nvbo->bo.mem.bus.base +
                   nvbo->bo.mem.bus.offset;
    info->fix.smem_len = size;

    info->screen_base = nvbo_kmap_obj_iovirtual(nouveau_fb->nvbo);
    info->screen_size = size;

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

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

    mutex_unlock(&dev->struct_mutex);

    if (chan) {
        ret = -ENODEV;
        if (device->card_type < NV_50)
            ret = nv04_fbcon_accel_init(info);
        else
        if (device->card_type < NV_C0)
            ret = nv50_fbcon_accel_init(info);
        else
            ret = nvc0_fbcon_accel_init(info);

        if (ret == 0)
            info->fbops = &nouveau_fbcon_ops;
    }

    nouveau_fbcon_zfill(dev, fbcon);

    /* To allow resizeing without swapping buffers */
    NV_INFO(drm, "allocated %dx%d fb: 0x%lx, bo %p\n",
        nouveau_fb->base.width, nouveau_fb->base.height,
        nvbo->bo.offset, nvbo);

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

out_unref:
    mutex_unlock(&dev->struct_mutex);
out:
    return ret;
}

static int
nouveau_fbcon_find_or_create_single(struct drm_fb_helper *helper,
                    struct drm_fb_helper_surface_size *sizes)
{
    struct nouveau_fbdev *fbcon = (struct nouveau_fbdev *)helper;
    int new_fb = 0;
    int ret;

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

void
nouveau_fbcon_output_poll_changed(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    drm_fb_helper_hotplug_event(&drm->fbcon->helper);
}

static int
nouveau_fbcon_destroy(struct drm_device *dev, struct nouveau_fbdev *fbcon)
{
    struct nouveau_framebuffer *nouveau_fb = &fbcon->nouveau_fb;
    struct fb_info *info;

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

    if (nouveau_fb->nvbo) {
        nouveau_bo_unmap(nouveau_fb->nvbo);
        nouveau_bo_vma_del(nouveau_fb->nvbo, &nouveau_fb->vma);
        drm_gem_object_unreference_unlocked(nouveau_fb->nvbo->gem);
        nouveau_fb->nvbo = NULL;
    }
    drm_fb_helper_fini(&fbcon->helper);
    drm_framebuffer_cleanup(&nouveau_fb->base);
    return 0;
}

void nouveau_fbcon_gpu_lockup(struct fb_info *info)
{
    struct nouveau_fbdev *fbcon = info->par;
    struct nouveau_drm *drm = nouveau_drm(fbcon->dev);

    NV_ERROR(drm, "GPU lockup - switching to software fbcon\n");
    info->flags |= FBINFO_HWACCEL_DISABLED;
}

static struct drm_fb_helper_funcs nouveau_fbcon_helper_funcs = {
    .gamma_set = nouveau_fbcon_gamma_set,
    .gamma_get = nouveau_fbcon_gamma_get,
    .fb_probe = nouveau_fbcon_find_or_create_single,
};


int
nouveau_fbcon_init(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_fb *pfb = nouveau_fb(drm->device);
    struct nouveau_fbdev *fbcon;
    int preferred_bpp;
    int ret;

    if (!dev->mode_config.num_crtc)
        return 0;

    fbcon = kzalloc(sizeof(struct nouveau_fbdev), GFP_KERNEL);
    if (!fbcon)
        return -ENOMEM;

    fbcon->dev = dev;
    drm->fbcon = fbcon;
    fbcon->helper.funcs = &nouveau_fbcon_helper_funcs;

    ret = drm_fb_helper_init(dev, &fbcon->helper,
                 dev->mode_config.num_crtc, 4);
    if (ret) {
        kfree(fbcon);
        return ret;
    }

    drm_fb_helper_single_add_all_connectors(&fbcon->helper);

    if (pfb->ram.size <= 32 * 1024 * 1024)
        preferred_bpp = 8;
    else
    if (pfb->ram.size <= 64 * 1024 * 1024)
        preferred_bpp = 16;
    else
        preferred_bpp = 32;

    drm_fb_helper_initial_config(&fbcon->helper, preferred_bpp);
    return 0;
}

void
nouveau_fbcon_fini(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);

    if (!drm->fbcon)
        return;

    nouveau_fbcon_destroy(dev, drm->fbcon);
    kfree(drm->fbcon);
    drm->fbcon = NULL;
}

void nouveau_fbcon_save_disable_accel(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);

    drm->fbcon->saved_flags = drm->fbcon->helper.fbdev->flags;
    drm->fbcon->helper.fbdev->flags |= FBINFO_HWACCEL_DISABLED;
}

void nouveau_fbcon_restore_accel(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    drm->fbcon->helper.fbdev->flags = drm->fbcon->saved_flags;
}

void nouveau_fbcon_set_suspend(struct drm_device *dev, int state)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    console_lock();
    if (state == 0)
        nouveau_fbcon_save_disable_accel(dev);
    fb_set_suspend(drm->fbcon->helper.fbdev, state);
    if (state == 1)
        nouveau_fbcon_restore_accel(dev);
    console_unlock();
}

void nouveau_fbcon_zfill_all(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    nouveau_fbcon_zfill(dev, drm->fbcon);
}