cirrus_main.c

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/*
 * Copyright 2012 Red Hat
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License version 2. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Authors: Matthew Garrett
 *          Dave Airlie
 */
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>

#include "cirrus_drv.h"


static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
    struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
    if (cirrus_fb->obj)
        drm_gem_object_unreference_unlocked(cirrus_fb->obj);
    drm_framebuffer_cleanup(fb);
    kfree(fb);
}

static int cirrus_user_framebuffer_create_handle(struct drm_framebuffer *fb,
                         struct drm_file *file_priv,
                         unsigned int *handle)
{
    return 0;
}

static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
    .destroy = cirrus_user_framebuffer_destroy,
    .create_handle = cirrus_user_framebuffer_create_handle,
};

int cirrus_framebuffer_init(struct drm_device *dev,
                struct cirrus_framebuffer *gfb,
                struct drm_mode_fb_cmd2 *mode_cmd,
                struct drm_gem_object *obj)
{
    int ret;

    ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
    if (ret) {
        DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
        return ret;
    }
    drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
    gfb->obj = obj;
    return 0;
}

static struct drm_framebuffer *
cirrus_user_framebuffer_create(struct drm_device *dev,
                   struct drm_file *filp,
                   struct drm_mode_fb_cmd2 *mode_cmd)
{
    struct drm_gem_object *obj;
    struct cirrus_framebuffer *cirrus_fb;
    int ret;
    u32 bpp, depth;

    drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
    /* cirrus can't handle > 24bpp framebuffers at all */
    if (bpp > 24)
        return ERR_PTR(-EINVAL);

    obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
    if (obj == NULL)
        return ERR_PTR(-ENOENT);

    cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
    if (!cirrus_fb) {
        drm_gem_object_unreference_unlocked(obj);
        return ERR_PTR(-ENOMEM);
    }

    ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
    if (ret) {
        drm_gem_object_unreference_unlocked(obj);
        kfree(cirrus_fb);
        return ERR_PTR(ret);
    }
    return &cirrus_fb->base;
}

static const struct drm_mode_config_funcs cirrus_mode_funcs = {
    .fb_create = cirrus_user_framebuffer_create,
};

/* Unmap the framebuffer from the core and release the memory */
static void cirrus_vram_fini(struct cirrus_device *cdev)
{
    iounmap(cdev->rmmio);
    cdev->rmmio = NULL;
    if (cdev->mc.vram_base)
        release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
}

/* Map the framebuffer from the card and configure the core */
static int cirrus_vram_init(struct cirrus_device *cdev)
{
    /* BAR 0 is VRAM */
    cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
    /* We have 4MB of VRAM */
    cdev->mc.vram_size = 4 * 1024 * 1024;

    if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
                "cirrusdrmfb_vram")) {
        DRM_ERROR("can't reserve VRAM\n");
        return -ENXIO;
    }

    return 0;
}

/*
 * Our emulated hardware has two sets of memory. One is video RAM and can
 * simply be used as a linear framebuffer - the other provides mmio access
 * to the display registers. The latter can also be accessed via IO port
 * access, but we map the range and use mmio to program them instead
 */

int cirrus_device_init(struct cirrus_device *cdev,
               struct drm_device *ddev,
               struct pci_dev *pdev, uint32_t flags)
{
    int ret;

    cdev->dev = ddev;
    cdev->flags = flags;

    /* Hardcode the number of CRTCs to 1 */
    cdev->num_crtc = 1;

    /* BAR 0 is the framebuffer, BAR 1 contains registers */
    cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
    cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);

    if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
                "cirrusdrmfb_mmio")) {
        DRM_ERROR("can't reserve mmio registers\n");
        return -ENOMEM;
    }

    cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);

    if (cdev->rmmio == NULL)
        return -ENOMEM;

    ret = cirrus_vram_init(cdev);
    if (ret) {
        release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
        return ret;
    }

    return 0;
}

void cirrus_device_fini(struct cirrus_device *cdev)
{
    release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
    cirrus_vram_fini(cdev);
}

/*
 * Functions here will be called by the core once it's bound the driver to
 * a PCI device
 */

int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
{
    struct cirrus_device *cdev;
    int r;

    cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
    if (cdev == NULL)
        return -ENOMEM;
    dev->dev_private = (void *)cdev;

    r = cirrus_device_init(cdev, dev, dev->pdev, flags);
    if (r) {
        dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
        goto out;
    }

    r = cirrus_mm_init(cdev);
    if (r)
        dev_err(&dev->pdev->dev, "fatal err on mm init\n");

    r = cirrus_modeset_init(cdev);
    if (r)
        dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);

    dev->mode_config.funcs = (void *)&cirrus_mode_funcs;
out:
    if (r)
        cirrus_driver_unload(dev);
    return r;
}

int cirrus_driver_unload(struct drm_device *dev)
{
    struct cirrus_device *cdev = dev->dev_private;

    if (cdev == NULL)
        return 0;
    cirrus_modeset_fini(cdev);
    cirrus_mm_fini(cdev);
    cirrus_device_fini(cdev);
    kfree(cdev);
    dev->dev_private = NULL;
    return 0;
}

int cirrus_gem_create(struct drm_device *dev,
           u32 size, bool iskernel,
           struct drm_gem_object **obj)
{
    struct cirrus_bo *cirrusbo;
    int ret;

    *obj = NULL;

    size = roundup(size, PAGE_SIZE);
    if (size == 0)
        return -EINVAL;

    ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
    if (ret) {
        if (ret != -ERESTARTSYS)
            DRM_ERROR("failed to allocate GEM object\n");
        return ret;
    }
    *obj = &cirrusbo->gem;
    return 0;
}

int cirrus_dumb_create(struct drm_file *file,
            struct drm_device *dev,
            struct drm_mode_create_dumb *args)
{
    int ret;
    struct drm_gem_object *gobj;
    u32 handle;

    args->pitch = args->width * ((args->bpp + 7) / 8);
    args->size = args->pitch * args->height;

    ret = cirrus_gem_create(dev, args->size, false,
                 &gobj);
    if (ret)
        return ret;

    ret = drm_gem_handle_create(file, gobj, &handle);
    drm_gem_object_unreference_unlocked(gobj);
    if (ret)
        return ret;

    args->handle = handle;
    return 0;
}

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

int cirrus_gem_init_object(struct drm_gem_object *obj)
{
    BUG();
    return 0;
}

void cirrus_bo_unref(struct cirrus_bo **bo)
{
    struct ttm_buffer_object *tbo;

    if ((*bo) == NULL)
        return;

    tbo = &((*bo)->bo);
    ttm_bo_unref(&tbo);
    if (tbo == NULL)
        *bo = NULL;

}

void cirrus_gem_free_object(struct drm_gem_object *obj)
{
    struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);

    if (!cirrus_bo)
        return;
    cirrus_bo_unref(&cirrus_bo);
}


static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
{
    return bo->bo.addr_space_offset;
}

int
cirrus_dumb_mmap_offset(struct drm_file *file,
             struct drm_device *dev,
             uint32_t handle,
             uint64_t *offset)
{
    struct drm_gem_object *obj;
    int ret;
    struct cirrus_bo *bo;

    mutex_lock(&dev->struct_mutex);
    obj = drm_gem_object_lookup(dev, file, handle);
    if (obj == NULL) {
        ret = -ENOENT;
        goto out_unlock;
    }

    bo = gem_to_cirrus_bo(obj);
    *offset = cirrus_bo_mmap_offset(bo);

    drm_gem_object_unreference(obj);
    ret = 0;
out_unlock:
    mutex_unlock(&dev->struct_mutex);
    return ret;

}