radeon_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/slab.h>
#include <linux/fb.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/radeon_drm.h>
#include "radeon.h"

#include <drm/drm_fb_helper.h>

#include <linux/vga_switcheroo.h>

/* object hierarchy -
   this contains a helper + a radeon fb
   the helper contains a pointer to radeon framebuffer baseclass.
*/
struct radeon_fbdev {
    struct drm_fb_helper helper;
    struct radeon_framebuffer rfb;
    struct list_head fbdev_list;
    struct radeon_device *rdev;
};

static struct fb_ops radeonfb_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,
};


int radeon_align_pitch(struct radeon_device *rdev, int width, int bpp, bool tiled)
{
    int aligned = width;
    int align_large = (ASIC_IS_AVIVO(rdev)) || tiled;
    int pitch_mask = 0;

    switch (bpp / 8) {
    case 1:
        pitch_mask = align_large ? 255 : 127;
        break;
    case 2:
        pitch_mask = align_large ? 127 : 31;
        break;
    case 3:
    case 4:
        pitch_mask = align_large ? 63 : 15;
        break;
    }

    aligned += pitch_mask;
    aligned &= ~pitch_mask;
    return aligned;
}

static void radeonfb_destroy_pinned_object(struct drm_gem_object *gobj)
{
    struct radeon_bo *rbo = gem_to_radeon_bo(gobj);
    int ret;

    ret = radeon_bo_reserve(rbo, false);
    if (likely(ret == 0)) {
        radeon_bo_kunmap(rbo);
        radeon_bo_unpin(rbo);
        radeon_bo_unreserve(rbo);
    }
    drm_gem_object_unreference_unlocked(gobj);
}

static int radeonfb_create_pinned_object(struct radeon_fbdev *rfbdev,
                     struct drm_mode_fb_cmd2 *mode_cmd,
                     struct drm_gem_object **gobj_p)
{
    struct radeon_device *rdev = rfbdev->rdev;
    struct drm_gem_object *gobj = NULL;
    struct radeon_bo *rbo = NULL;
    bool fb_tiled = false; /* useful for testing */
    u32 tiling_flags = 0;
    int ret;
    int aligned_size, size;
    int height = mode_cmd->height;
    u32 bpp, depth;

    drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);

    /* need to align pitch with crtc limits */
    mode_cmd->pitches[0] = radeon_align_pitch(rdev, mode_cmd->width, bpp,
                          fb_tiled) * ((bpp + 1) / 8);

    if (rdev->family >= CHIP_R600)
        height = ALIGN(mode_cmd->height, 8);
    size = mode_cmd->pitches[0] * height;
    aligned_size = ALIGN(size, PAGE_SIZE);
    ret = radeon_gem_object_create(rdev, aligned_size, 0,
                       RADEON_GEM_DOMAIN_VRAM,
                       false, true,
                       &gobj);
    if (ret) {
        printk(KERN_ERR "failed to allocate framebuffer (%d)\n",
               aligned_size);
        return -ENOMEM;
    }
    rbo = gem_to_radeon_bo(gobj);

    if (fb_tiled)
        tiling_flags = RADEON_TILING_MACRO;

#ifdef __BIG_ENDIAN
    switch (bpp) {
    case 32:
        tiling_flags |= RADEON_TILING_SWAP_32BIT;
        break;
    case 16:
        tiling_flags |= RADEON_TILING_SWAP_16BIT;
    default:
        break;
    }
#endif

    if (tiling_flags) {
        ret = radeon_bo_set_tiling_flags(rbo,
                         tiling_flags | RADEON_TILING_SURFACE,
                         mode_cmd->pitches[0]);
        if (ret)
            dev_err(rdev->dev, "FB failed to set tiling flags\n");
    }


    ret = radeon_bo_reserve(rbo, false);
    if (unlikely(ret != 0))
        goto out_unref;
    /* Only 27 bit offset for legacy CRTC */
    ret = radeon_bo_pin_restricted(rbo, RADEON_GEM_DOMAIN_VRAM,
                       ASIC_IS_AVIVO(rdev) ? 0 : 1 << 27,
                       NULL);
    if (ret) {
        radeon_bo_unreserve(rbo);
        goto out_unref;
    }
    if (fb_tiled)
        radeon_bo_check_tiling(rbo, 0, 0);
    ret = radeon_bo_kmap(rbo, NULL);
    radeon_bo_unreserve(rbo);
    if (ret) {
        goto out_unref;
    }

    *gobj_p = gobj;
    return 0;
out_unref:
    radeonfb_destroy_pinned_object(gobj);
    *gobj_p = NULL;
    return ret;
}

static int radeonfb_create(struct radeon_fbdev *rfbdev,
               struct drm_fb_helper_surface_size *sizes)
{
    struct radeon_device *rdev = rfbdev->rdev;
    struct fb_info *info;
    struct drm_framebuffer *fb = NULL;
    struct drm_mode_fb_cmd2 mode_cmd;
    struct drm_gem_object *gobj = NULL;
    struct radeon_bo *rbo = NULL;
    struct device *device = &rdev->pdev->dev;
    int ret;
    unsigned long tmp;

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

    /* avivo can't scanout real 24bpp */
    if ((sizes->surface_bpp == 24) && ASIC_IS_AVIVO(rdev))
        sizes->surface_bpp = 32;

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

    ret = radeonfb_create_pinned_object(rfbdev, &mode_cmd, &gobj);
    if (ret) {
        DRM_ERROR("failed to create fbcon object %d\n", ret);
        return ret;
    }

    rbo = gem_to_radeon_bo(gobj);

    /* okay we have an object now allocate the framebuffer */
    info = framebuffer_alloc(0, device);
    if (info == NULL) {
        ret = -ENOMEM;
        goto out_unref;
    }

    info->par = rfbdev;

    ret = radeon_framebuffer_init(rdev->ddev, &rfbdev->rfb, &mode_cmd, gobj);
    if (ret) {
        DRM_ERROR("failed to initalise framebuffer %d\n", ret);
        goto out_unref;
    }

    fb = &rfbdev->rfb.base;

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

    memset_io(rbo->kptr, 0x0, radeon_bo_size(rbo));

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

    drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);

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

    tmp = radeon_bo_gpu_offset(rbo) - rdev->mc.vram_start;
    info->fix.smem_start = rdev->mc.aper_base + tmp;
    info->fix.smem_len = radeon_bo_size(rbo);
    info->screen_base = rbo->kptr;
    info->screen_size = radeon_bo_size(rbo);

    drm_fb_helper_fill_var(info, &rfbdev->helper, sizes->fb_width, sizes->fb_height);

    /* setup aperture base/size for vesafb takeover */
    info->apertures = alloc_apertures(1);
    if (!info->apertures) {
        ret = -ENOMEM;
        goto out_unref;
    }
    info->apertures->ranges[0].base = rdev->ddev->mode_config.fb_base;
    info->apertures->ranges[0].size = rdev->mc.aper_size;

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

    if (info->screen_base == NULL) {
        ret = -ENOSPC;
        goto out_unref;
    }

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

    DRM_INFO("fb mappable at 0x%lX\n",  info->fix.smem_start);
    DRM_INFO("vram apper at 0x%lX\n",  (unsigned long)rdev->mc.aper_base);
    DRM_INFO("size %lu\n", (unsigned long)radeon_bo_size(rbo));
    DRM_INFO("fb depth is %d\n", fb->depth);
    DRM_INFO("   pitch is %d\n", fb->pitches[0]);

    vga_switcheroo_client_fb_set(rdev->ddev->pdev, info);
    return 0;

out_unref:
    if (rbo) {

    }
    if (fb && ret) {
        drm_gem_object_unreference(gobj);
        drm_framebuffer_cleanup(fb);
        kfree(fb);
    }
    return ret;
}

static int radeon_fb_find_or_create_single(struct drm_fb_helper *helper,
                       struct drm_fb_helper_surface_size *sizes)
{
    struct radeon_fbdev *rfbdev = (struct radeon_fbdev *)helper;
    int new_fb = 0;
    int ret;

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

void radeon_fb_output_poll_changed(struct radeon_device *rdev)
{
    drm_fb_helper_hotplug_event(&rdev->mode_info.rfbdev->helper);
}

static int radeon_fbdev_destroy(struct drm_device *dev, struct radeon_fbdev *rfbdev)
{
    struct fb_info *info;
    struct radeon_framebuffer *rfb = &rfbdev->rfb;

    if (rfbdev->helper.fbdev) {
        info = rfbdev->helper.fbdev;

        unregister_framebuffer(info);
        if (info->cmap.len)
            fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
    }

    if (rfb->obj) {
        radeonfb_destroy_pinned_object(rfb->obj);
        rfb->obj = NULL;
    }
    drm_fb_helper_fini(&rfbdev->helper);
    drm_framebuffer_cleanup(&rfb->base);

    return 0;
}

static struct drm_fb_helper_funcs radeon_fb_helper_funcs = {
    .gamma_set = radeon_crtc_fb_gamma_set,
    .gamma_get = radeon_crtc_fb_gamma_get,
    .fb_probe = radeon_fb_find_or_create_single,
};

int radeon_fbdev_init(struct radeon_device *rdev)
{
    struct radeon_fbdev *rfbdev;
    int bpp_sel = 32;
    int ret;

    /* select 8 bpp console on RN50 or 16MB cards */
    if (ASIC_IS_RN50(rdev) || rdev->mc.real_vram_size <= (32*1024*1024))
        bpp_sel = 8;

    rfbdev = kzalloc(sizeof(struct radeon_fbdev), GFP_KERNEL);
    if (!rfbdev)
        return -ENOMEM;

    rfbdev->rdev = rdev;
    rdev->mode_info.rfbdev = rfbdev;
    rfbdev->helper.funcs = &radeon_fb_helper_funcs;

    ret = drm_fb_helper_init(rdev->ddev, &rfbdev->helper,
                 rdev->num_crtc,
                 RADEONFB_CONN_LIMIT);
    if (ret) {
        kfree(rfbdev);
        return ret;
    }

    drm_fb_helper_single_add_all_connectors(&rfbdev->helper);
    drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
    return 0;
}

void radeon_fbdev_fini(struct radeon_device *rdev)
{
    if (!rdev->mode_info.rfbdev)
        return;

    radeon_fbdev_destroy(rdev->ddev, rdev->mode_info.rfbdev);
    kfree(rdev->mode_info.rfbdev);
    rdev->mode_info.rfbdev = NULL;
}

void radeon_fbdev_set_suspend(struct radeon_device *rdev, int state)
{
    fb_set_suspend(rdev->mode_info.rfbdev->helper.fbdev, state);
}

int radeon_fbdev_total_size(struct radeon_device *rdev)
{
    struct radeon_bo *robj;
    int size = 0;

    robj = gem_to_radeon_bo(rdev->mode_info.rfbdev->rfb.obj);
    size += radeon_bo_size(robj);
    return size;
}

bool radeon_fbdev_robj_is_fb(struct radeon_device *rdev, struct radeon_bo *robj)
{
    if (robj == gem_to_radeon_bo(rdev->mode_info.rfbdev->rfb.obj))
        return true;
    return false;
}