nouveau_display.c

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/*
 * Copyright (C) 2008 Maarten Maathuis.
 * All Rights Reserved.
 *
 * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
 *
 */

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

#include "nouveau_fbcon.h"
#include "nouveau_hw.h"
#include "nouveau_crtc.h"
#include "nouveau_dma.h"
#include "nouveau_gem.h"
#include "nouveau_connector.h"
#include "nv50_display.h"

#include "nouveau_fence.h"

#include <subdev/bios/gpio.h>
#include <subdev/gpio.h>
#include <engine/disp.h>

static void
nouveau_user_framebuffer_destroy(struct drm_framebuffer *drm_fb)
{
    struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);

    if (fb->nvbo)
        drm_gem_object_unreference_unlocked(fb->nvbo->gem);

    drm_framebuffer_cleanup(drm_fb);
    kfree(fb);
}

static int
nouveau_user_framebuffer_create_handle(struct drm_framebuffer *drm_fb,
                       struct drm_file *file_priv,
                       unsigned int *handle)
{
    struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);

    return drm_gem_handle_create(file_priv, fb->nvbo->gem, handle);
}

static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
    .destroy = nouveau_user_framebuffer_destroy,
    .create_handle = nouveau_user_framebuffer_create_handle,
};

int
nouveau_framebuffer_init(struct drm_device *dev,
             struct nouveau_framebuffer *nv_fb,
             struct drm_mode_fb_cmd2 *mode_cmd,
             struct nouveau_bo *nvbo)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct drm_framebuffer *fb = &nv_fb->base;
    int ret;

    ret = drm_framebuffer_init(dev, fb, &nouveau_framebuffer_funcs);
    if (ret) {
        return ret;
    }

    drm_helper_mode_fill_fb_struct(fb, mode_cmd);
    nv_fb->nvbo = nvbo;

    if (nv_device(drm->device)->card_type >= NV_50) {
        u32 tile_flags = nouveau_bo_tile_layout(nvbo);
        if (tile_flags == 0x7a00 ||
            tile_flags == 0xfe00)
            nv_fb->r_dma = NvEvoFB32;
        else
        if (tile_flags == 0x7000)
            nv_fb->r_dma = NvEvoFB16;
        else
            nv_fb->r_dma = NvEvoVRAM_LP;

        switch (fb->depth) {
        case  8: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_8; break;
        case 15: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_15; break;
        case 16: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_16; break;
        case 24:
        case 32: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_24; break;
        case 30: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_30; break;
        default:
             NV_ERROR(drm, "unknown depth %d\n", fb->depth);
             return -EINVAL;
        }

        if (nv_device(drm->device)->chipset == 0x50)
            nv_fb->r_format |= (tile_flags << 8);

        if (!tile_flags) {
            if (nv_device(drm->device)->card_type < NV_D0)
                nv_fb->r_pitch = 0x00100000 | fb->pitches[0];
            else
                nv_fb->r_pitch = 0x01000000 | fb->pitches[0];
        } else {
            u32 mode = nvbo->tile_mode;
            if (nv_device(drm->device)->card_type >= NV_C0)
                mode >>= 4;
            nv_fb->r_pitch = ((fb->pitches[0] / 4) << 4) | mode;
        }
    }

    return 0;
}

static struct drm_framebuffer *
nouveau_user_framebuffer_create(struct drm_device *dev,
                struct drm_file *file_priv,
                struct drm_mode_fb_cmd2 *mode_cmd)
{
    struct nouveau_framebuffer *nouveau_fb;
    struct drm_gem_object *gem;
    int ret;

    gem = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
    if (!gem)
        return ERR_PTR(-ENOENT);

    nouveau_fb = kzalloc(sizeof(struct nouveau_framebuffer), GFP_KERNEL);
    if (!nouveau_fb)
        return ERR_PTR(-ENOMEM);

    ret = nouveau_framebuffer_init(dev, nouveau_fb, mode_cmd, nouveau_gem_object(gem));
    if (ret) {
        drm_gem_object_unreference(gem);
        return ERR_PTR(ret);
    }

    return &nouveau_fb->base;
}

static const struct drm_mode_config_funcs nouveau_mode_config_funcs = {
    .fb_create = nouveau_user_framebuffer_create,
    .output_poll_changed = nouveau_fbcon_output_poll_changed,
};


struct nouveau_drm_prop_enum_list {
    u8 gen_mask;
    int type;
    char *name;
};

static struct nouveau_drm_prop_enum_list underscan[] = {
    { 6, UNDERSCAN_AUTO, "auto" },
    { 6, UNDERSCAN_OFF, "off" },
    { 6, UNDERSCAN_ON, "on" },
    {}
};

static struct nouveau_drm_prop_enum_list dither_mode[] = {
    { 7, DITHERING_MODE_AUTO, "auto" },
    { 7, DITHERING_MODE_OFF, "off" },
    { 1, DITHERING_MODE_ON, "on" },
    { 6, DITHERING_MODE_STATIC2X2, "static 2x2" },
    { 6, DITHERING_MODE_DYNAMIC2X2, "dynamic 2x2" },
    { 4, DITHERING_MODE_TEMPORAL, "temporal" },
    {}
};

static struct nouveau_drm_prop_enum_list dither_depth[] = {
    { 6, DITHERING_DEPTH_AUTO, "auto" },
    { 6, DITHERING_DEPTH_6BPC, "6 bpc" },
    { 6, DITHERING_DEPTH_8BPC, "8 bpc" },
    {}
};

#define PROP_ENUM(p,gen,n,list) do {                                           \
    struct nouveau_drm_prop_enum_list *l = (list);                         \
    int c = 0;                                                             \
    while (l->gen_mask) {                                                  \
        if (l->gen_mask & (1 << (gen)))                                \
            c++;                                                   \
        l++;                                                           \
    }                                                                      \
    if (c) {                                                               \
        p = drm_property_create(dev, DRM_MODE_PROP_ENUM, n, c);        \
        l = (list);                                                    \
        c = 0;                                                         \
        while (p && l->gen_mask) {                                     \
            if (l->gen_mask & (1 << (gen))) {                      \
                drm_property_add_enum(p, c, l->type, l->name); \
                c++;                                           \
            }                                                      \
            l++;                                                   \
        }                                                              \
    }                                                                      \
} while(0)

int
nouveau_display_init(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_display *disp = nouveau_display(dev);
    struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
    struct drm_connector *connector;
    int ret;

    ret = disp->init(dev);
    if (ret)
        return ret;

    /* power on internal panel if it's not already.  the init tables of
     * some vbios default this to off for some reason, causing the
     * panel to not work after resume
     */
    if (gpio && gpio->get(gpio, 0, DCB_GPIO_PANEL_POWER, 0xff) == 0) {
        gpio->set(gpio, 0, DCB_GPIO_PANEL_POWER, 0xff, 1);
        msleep(300);
    }

    /* enable polling for external displays */
    drm_kms_helper_poll_enable(dev);

    /* enable hotplug interrupts */
    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
        struct nouveau_connector *conn = nouveau_connector(connector);
        if (gpio)
            gpio->irq(gpio, 0, conn->hpd, 0xff, true);
    }

    return ret;
}

void
nouveau_display_fini(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_display *disp = nouveau_display(dev);
    struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
    struct drm_connector *connector;

    /* disable hotplug interrupts */
    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
        struct nouveau_connector *conn = nouveau_connector(connector);
        if (gpio)
            gpio->irq(gpio, 0, conn->hpd, 0xff, false);
    }

    drm_kms_helper_poll_disable(dev);
    disp->fini(dev);
}

static void
nouveau_display_vblank_notify(void *data, int crtc)
{
    drm_handle_vblank(data, crtc);
}

static void
nouveau_display_vblank_get(void *data, int crtc)
{
    drm_vblank_get(data, crtc);
}

static void
nouveau_display_vblank_put(void *data, int crtc)
{
    drm_vblank_put(data, crtc);
}

int
nouveau_display_create(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_disp *pdisp = nouveau_disp(drm->device);
    struct nouveau_display *disp;
    u32 pclass = dev->pdev->class >> 8;
    int ret, gen;

    disp = drm->display = kzalloc(sizeof(*disp), GFP_KERNEL);
    if (!disp)
        return -ENOMEM;

    pdisp->vblank.data = dev;
    pdisp->vblank.notify = nouveau_display_vblank_notify;
    pdisp->vblank.get = nouveau_display_vblank_get;
    pdisp->vblank.put = nouveau_display_vblank_put;

    drm_mode_config_init(dev);
    drm_mode_create_scaling_mode_property(dev);
    drm_mode_create_dvi_i_properties(dev);

    if (nv_device(drm->device)->card_type < NV_50)
        gen = 0;
    else
    if (nv_device(drm->device)->card_type < NV_D0)
        gen = 1;
    else
        gen = 2;

    PROP_ENUM(disp->dithering_mode, gen, "dithering mode", dither_mode);
    PROP_ENUM(disp->dithering_depth, gen, "dithering depth", dither_depth);
    PROP_ENUM(disp->underscan_property, gen, "underscan", underscan);

    disp->underscan_hborder_property =
        drm_property_create_range(dev, 0, "underscan hborder", 0, 128);

    disp->underscan_vborder_property =
        drm_property_create_range(dev, 0, "underscan vborder", 0, 128);

    if (gen == 1) {
        disp->vibrant_hue_property =
            drm_property_create(dev, DRM_MODE_PROP_RANGE,
                        "vibrant hue", 2);
        disp->vibrant_hue_property->values[0] = 0;
        disp->vibrant_hue_property->values[1] = 180; /* -90..+90 */

        disp->color_vibrance_property =
            drm_property_create(dev, DRM_MODE_PROP_RANGE,
                        "color vibrance", 2);
        disp->color_vibrance_property->values[0] = 0;
        disp->color_vibrance_property->values[1] = 200; /* -100..+100 */
    }

    dev->mode_config.funcs = &nouveau_mode_config_funcs;
    dev->mode_config.fb_base = pci_resource_start(dev->pdev, 1);

    dev->mode_config.min_width = 0;
    dev->mode_config.min_height = 0;
    if (nv_device(drm->device)->card_type < NV_10) {
        dev->mode_config.max_width = 2048;
        dev->mode_config.max_height = 2048;
    } else
    if (nv_device(drm->device)->card_type < NV_50) {
        dev->mode_config.max_width = 4096;
        dev->mode_config.max_height = 4096;
    } else {
        dev->mode_config.max_width = 8192;
        dev->mode_config.max_height = 8192;
    }

    dev->mode_config.preferred_depth = 24;
    dev->mode_config.prefer_shadow = 1;

    drm_kms_helper_poll_init(dev);
    drm_kms_helper_poll_disable(dev);

    if (nouveau_modeset == 1 ||
        (nouveau_modeset < 0 && pclass == PCI_CLASS_DISPLAY_VGA)) {
        if (nv_device(drm->device)->card_type < NV_50)
            ret = nv04_display_create(dev);
        else
        if (nv_device(drm->device)->card_type < NV_D0)
            ret = nv50_display_create(dev);
        else
            ret = nvd0_display_create(dev);
        if (ret)
            goto disp_create_err;

        if (dev->mode_config.num_crtc) {
            ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
            if (ret)
                goto vblank_err;
        }

        nouveau_backlight_init(dev);
    }

    return 0;

vblank_err:
    disp->dtor(dev);
disp_create_err:
    drm_kms_helper_poll_fini(dev);
    drm_mode_config_cleanup(dev);
    return ret;
}

void
nouveau_display_destroy(struct drm_device *dev)
{
    struct nouveau_display *disp = nouveau_display(dev);

    nouveau_backlight_exit(dev);
    drm_vblank_cleanup(dev);

    if (disp->dtor)
        disp->dtor(dev);

    drm_kms_helper_poll_fini(dev);
    drm_mode_config_cleanup(dev);
    nouveau_drm(dev)->display = NULL;
    kfree(disp);
}

int
nouveau_display_suspend(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct drm_crtc *crtc;

    nouveau_display_fini(dev);

    NV_INFO(drm, "unpinning framebuffer(s)...\n");
    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
        struct nouveau_framebuffer *nouveau_fb;

        nouveau_fb = nouveau_framebuffer(crtc->fb);
        if (!nouveau_fb || !nouveau_fb->nvbo)
            continue;

        nouveau_bo_unpin(nouveau_fb->nvbo);
    }

    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

        nouveau_bo_unmap(nv_crtc->cursor.nvbo);
        nouveau_bo_unpin(nv_crtc->cursor.nvbo);
    }

    return 0;
}

void
nouveau_display_resume(struct drm_device *dev)
{
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct drm_crtc *crtc;
    int ret;

    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
        struct nouveau_framebuffer *nouveau_fb;

        nouveau_fb = nouveau_framebuffer(crtc->fb);
        if (!nouveau_fb || !nouveau_fb->nvbo)
            continue;

        nouveau_bo_pin(nouveau_fb->nvbo, TTM_PL_FLAG_VRAM);
    }

    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

        ret = nouveau_bo_pin(nv_crtc->cursor.nvbo, TTM_PL_FLAG_VRAM);
        if (!ret)
            ret = nouveau_bo_map(nv_crtc->cursor.nvbo);
        if (ret)
            NV_ERROR(drm, "Could not pin/map cursor.\n");
    }

    nouveau_fbcon_set_suspend(dev, 0);
    nouveau_fbcon_zfill_all(dev);

    nouveau_display_init(dev);

    /* Force CLUT to get re-loaded during modeset */
    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

        nv_crtc->lut.depth = 0;
    }

    drm_helper_resume_force_mode(dev);

    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        u32 offset = nv_crtc->cursor.nvbo->bo.offset;

        nv_crtc->cursor.set_offset(nv_crtc, offset);
        nv_crtc->cursor.set_pos(nv_crtc, nv_crtc->cursor_saved_x,
                         nv_crtc->cursor_saved_y);
    }
}

int
nouveau_vblank_enable(struct drm_device *dev, int crtc)
{
    struct nouveau_device *device = nouveau_dev(dev);

    if (device->card_type >= NV_D0)
        nv_mask(device, 0x6100c0 + (crtc * 0x800), 1, 1);
    else
    if (device->card_type >= NV_50)
        nv_mask(device, NV50_PDISPLAY_INTR_EN_1, 0,
            NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc));
    else
        NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0,
                NV_PCRTC_INTR_0_VBLANK);

    return 0;
}

void
nouveau_vblank_disable(struct drm_device *dev, int crtc)
{
    struct nouveau_device *device = nouveau_dev(dev);

    if (device->card_type >= NV_D0)
        nv_mask(device, 0x6100c0 + (crtc * 0x800), 1, 0);
    else
    if (device->card_type >= NV_50)
        nv_mask(device, NV50_PDISPLAY_INTR_EN_1,
            NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc), 0);
    else
        NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0, 0);
}

static int
nouveau_page_flip_reserve(struct nouveau_bo *old_bo,
              struct nouveau_bo *new_bo)
{
    int ret;

    ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM);
    if (ret)
        return ret;

    ret = ttm_bo_reserve(&new_bo->bo, false, false, false, 0);
    if (ret)
        goto fail;

    if (likely(old_bo != new_bo)) {
        ret = ttm_bo_reserve(&old_bo->bo, false, false, false, 0);
        if (ret)
            goto fail_unreserve;
    }

    return 0;

fail_unreserve:
    ttm_bo_unreserve(&new_bo->bo);
fail:
    nouveau_bo_unpin(new_bo);
    return ret;
}

static void
nouveau_page_flip_unreserve(struct nouveau_bo *old_bo,
                struct nouveau_bo *new_bo,
                struct nouveau_fence *fence)
{
    nouveau_bo_fence(new_bo, fence);
    ttm_bo_unreserve(&new_bo->bo);

    if (likely(old_bo != new_bo)) {
        nouveau_bo_fence(old_bo, fence);
        ttm_bo_unreserve(&old_bo->bo);
    }

    nouveau_bo_unpin(old_bo);
}

static int
nouveau_page_flip_emit(struct nouveau_channel *chan,
               struct nouveau_bo *old_bo,
               struct nouveau_bo *new_bo,
               struct nouveau_page_flip_state *s,
               struct nouveau_fence **pfence)
{
    struct nouveau_fence_chan *fctx = chan->fence;
    struct nouveau_drm *drm = chan->drm;
    struct drm_device *dev = drm->dev;
    unsigned long flags;
    int ret;

    /* Queue it to the pending list */
    spin_lock_irqsave(&dev->event_lock, flags);
    list_add_tail(&s->head, &fctx->flip);
    spin_unlock_irqrestore(&dev->event_lock, flags);

    /* Synchronize with the old framebuffer */
    ret = nouveau_fence_sync(old_bo->bo.sync_obj, chan);
    if (ret)
        goto fail;

    /* Emit the pageflip */
    ret = RING_SPACE(chan, 3);
    if (ret)
        goto fail;

    if (nv_device(drm->device)->card_type < NV_C0) {
        BEGIN_NV04(chan, NvSubSw, NV_SW_PAGE_FLIP, 1);
        OUT_RING  (chan, 0x00000000);
        OUT_RING  (chan, 0x00000000);
    } else {
        BEGIN_NVC0(chan, 0, NV10_SUBCHAN_REF_CNT, 1);
        OUT_RING  (chan, 0);
        BEGIN_IMC0(chan, 0, NVSW_SUBCHAN_PAGE_FLIP, 0x0000);
    }
    FIRE_RING (chan);

    ret = nouveau_fence_new(chan, pfence);
    if (ret)
        goto fail;

    return 0;
fail:
    spin_lock_irqsave(&dev->event_lock, flags);
    list_del(&s->head);
    spin_unlock_irqrestore(&dev->event_lock, flags);
    return ret;
}

int
nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
               struct drm_pending_vblank_event *event)
{
    struct drm_device *dev = crtc->dev;
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_bo *old_bo = nouveau_framebuffer(crtc->fb)->nvbo;
    struct nouveau_bo *new_bo = nouveau_framebuffer(fb)->nvbo;
    struct nouveau_page_flip_state *s;
    struct nouveau_channel *chan = NULL;
    struct nouveau_fence *fence;
    int ret;

    if (!drm->channel)
        return -ENODEV;

    s = kzalloc(sizeof(*s), GFP_KERNEL);
    if (!s)
        return -ENOMEM;

    /* Don't let the buffers go away while we flip */
    ret = nouveau_page_flip_reserve(old_bo, new_bo);
    if (ret)
        goto fail_free;

    /* Initialize a page flip struct */
    *s = (struct nouveau_page_flip_state)
        { { }, event, nouveau_crtc(crtc)->index,
          fb->bits_per_pixel, fb->pitches[0], crtc->x, crtc->y,
          new_bo->bo.offset };

    /* Choose the channel the flip will be handled in */
    fence = new_bo->bo.sync_obj;
    if (fence)
        chan = fence->channel;
    if (!chan)
        chan = drm->channel;
    mutex_lock(&chan->cli->mutex);

    /* Emit a page flip */
    if (nv_device(drm->device)->card_type >= NV_50) {
        if (nv_device(drm->device)->card_type >= NV_D0)
            ret = nvd0_display_flip_next(crtc, fb, chan, 0);
        else
            ret = nv50_display_flip_next(crtc, fb, chan);
        if (ret) {
            mutex_unlock(&chan->cli->mutex);
            goto fail_unreserve;
        }
    }

    ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
    mutex_unlock(&chan->cli->mutex);
    if (ret)
        goto fail_unreserve;

    /* Update the crtc struct and cleanup */
    crtc->fb = fb;

    nouveau_page_flip_unreserve(old_bo, new_bo, fence);
    nouveau_fence_unref(&fence);
    return 0;

fail_unreserve:
    nouveau_page_flip_unreserve(old_bo, new_bo, NULL);
fail_free:
    kfree(s);
    return ret;
}

int
nouveau_finish_page_flip(struct nouveau_channel *chan,
             struct nouveau_page_flip_state *ps)
{
    struct nouveau_fence_chan *fctx = chan->fence;
    struct nouveau_drm *drm = chan->drm;
    struct drm_device *dev = drm->dev;
    struct nouveau_page_flip_state *s;
    unsigned long flags;

    spin_lock_irqsave(&dev->event_lock, flags);

    if (list_empty(&fctx->flip)) {
        NV_ERROR(drm, "unexpected pageflip\n");
        spin_unlock_irqrestore(&dev->event_lock, flags);
        return -EINVAL;
    }

    s = list_first_entry(&fctx->flip, struct nouveau_page_flip_state, head);
    if (s->event) {
        struct drm_pending_vblank_event *e = s->event;
        struct timeval now;

        do_gettimeofday(&now);
        e->event.sequence = 0;
        e->event.tv_sec = now.tv_sec;
        e->event.tv_usec = now.tv_usec;
        list_add_tail(&e->base.link, &e->base.file_priv->event_list);
        wake_up_interruptible(&e->base.file_priv->event_wait);
    }

    list_del(&s->head);
    if (ps)
        *ps = *s;
    kfree(s);

    spin_unlock_irqrestore(&dev->event_lock, flags);
    return 0;
}

int
nouveau_flip_complete(void *data)
{
    struct nouveau_channel *chan = data;
    struct nouveau_drm *drm = chan->drm;
    struct nouveau_page_flip_state state;

    if (!nouveau_finish_page_flip(chan, &state)) {
        if (nv_device(drm->device)->card_type < NV_50) {
            nv_set_crtc_base(drm->dev, state.crtc, state.offset +
                     state.y * state.pitch +
                     state.x * state.bpp / 8);
        }
    }

    return 0;
}

int
nouveau_display_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
                struct drm_mode_create_dumb *args)
{
    struct nouveau_bo *bo;
    int ret;

    args->pitch = roundup(args->width * (args->bpp / 8), 256);
    args->size = args->pitch * args->height;
    args->size = roundup(args->size, PAGE_SIZE);

    ret = nouveau_gem_new(dev, args->size, 0, NOUVEAU_GEM_DOMAIN_VRAM, 0, 0, &bo);
    if (ret)
        return ret;

    ret = drm_gem_handle_create(file_priv, bo->gem, &args->handle);
    drm_gem_object_unreference_unlocked(bo->gem);
    return ret;
}

int
nouveau_display_dumb_destroy(struct drm_file *file_priv, struct drm_device *dev,
                 uint32_t handle)
{
    return drm_gem_handle_delete(file_priv, handle);
}

int
nouveau_display_dumb_map_offset(struct drm_file *file_priv,
                struct drm_device *dev,
                uint32_t handle, uint64_t *poffset)
{
    struct drm_gem_object *gem;

    gem = drm_gem_object_lookup(dev, file_priv, handle);
    if (gem) {
        struct nouveau_bo *bo = gem->driver_private;
        *poffset = bo->bo.addr_space_offset;
        drm_gem_object_unreference_unlocked(gem);
        return 0;
    }

    return -ENOENT;
}