/**
 * \file radeon_ioc32.c
 *
 * 32-bit ioctl compatibility routines for the Radeon DRM.
 *
 * \author Paul Mackerras <paulus@samba.org>
 *
 * Copyright (C) Paul Mackerras 2005
 * 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 AUTHOR 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 <linux/compat.h>

#include <drm/drmP.h>
#include <drm/radeon_drm.h>
#include "radeon_drv.h"

typedef struct drm_radeon_init32 {
        int func;
        u32 sarea_priv_offset;
        int is_pci;
        int cp_mode;
        int gart_size;
        int ring_size;
        int usec_timeout;

        unsigned int fb_bpp;
        unsigned int front_offset, front_pitch;
        unsigned int back_offset, back_pitch;
        unsigned int depth_bpp;
        unsigned int depth_offset, depth_pitch;

        u32 fb_offset;
        u32 mmio_offset;
        u32 ring_offset;
        u32 ring_rptr_offset;
        u32 buffers_offset;
        u32 gart_textures_offset;
} drm_radeon_init32_t;

static int compat_radeon_cp_init(struct file *file, unsigned int cmd,
                                 unsigned long arg)
{
        drm_radeon_init32_t init32;
        drm_radeon_init_t __user *init;

        if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
                return -EFAULT;

        init = compat_alloc_user_space(sizeof(*init));
        if (!access_ok(VERIFY_WRITE, init, sizeof(*init))
            || __put_user(init32.func, &init->func)
            || __put_user(init32.sarea_priv_offset, &init->sarea_priv_offset)
            || __put_user(init32.is_pci, &init->is_pci)
            || __put_user(init32.cp_mode, &init->cp_mode)
            || __put_user(init32.gart_size, &init->gart_size)
            || __put_user(init32.ring_size, &init->ring_size)
            || __put_user(init32.usec_timeout, &init->usec_timeout)
            || __put_user(init32.fb_bpp, &init->fb_bpp)
            || __put_user(init32.front_offset, &init->front_offset)
            || __put_user(init32.front_pitch, &init->front_pitch)
            || __put_user(init32.back_offset, &init->back_offset)
            || __put_user(init32.back_pitch, &init->back_pitch)
            || __put_user(init32.depth_bpp, &init->depth_bpp)
            || __put_user(init32.depth_offset, &init->depth_offset)
            || __put_user(init32.depth_pitch, &init->depth_pitch)
            || __put_user(init32.fb_offset, &init->fb_offset)
            || __put_user(init32.mmio_offset, &init->mmio_offset)
            || __put_user(init32.ring_offset, &init->ring_offset)
            || __put_user(init32.ring_rptr_offset, &init->ring_rptr_offset)
            || __put_user(init32.buffers_offset, &init->buffers_offset)
            || __put_user(init32.gart_textures_offset,
                          &init->gart_textures_offset))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_CP_INIT, (unsigned long)init);
}

typedef struct drm_radeon_clear32 {
        unsigned int flags;
        unsigned int clear_color;
        unsigned int clear_depth;
        unsigned int color_mask;
        unsigned int depth_mask;        /* misnamed field:  should be stencil */
        u32 depth_boxes;
} drm_radeon_clear32_t;

static int compat_radeon_cp_clear(struct file *file, unsigned int cmd,
                                  unsigned long arg)
{
        drm_radeon_clear32_t clr32;
        drm_radeon_clear_t __user *clr;

        if (copy_from_user(&clr32, (void __user *)arg, sizeof(clr32)))
                return -EFAULT;

        clr = compat_alloc_user_space(sizeof(*clr));
        if (!access_ok(VERIFY_WRITE, clr, sizeof(*clr))
            || __put_user(clr32.flags, &clr->flags)
            || __put_user(clr32.clear_color, &clr->clear_color)
            || __put_user(clr32.clear_depth, &clr->clear_depth)
            || __put_user(clr32.color_mask, &clr->color_mask)
            || __put_user(clr32.depth_mask, &clr->depth_mask)
            || __put_user((void __user *)(unsigned long)clr32.depth_boxes,
                          &clr->depth_boxes))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_CLEAR, (unsigned long)clr);
}

typedef struct drm_radeon_stipple32 {
        u32 mask;
} drm_radeon_stipple32_t;

static int compat_radeon_cp_stipple(struct file *file, unsigned int cmd,
                                    unsigned long arg)
{
        drm_radeon_stipple32_t __user *argp = (void __user *)arg;
        drm_radeon_stipple_t __user *request;
        u32 mask;

        if (get_user(mask, &argp->mask))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user((unsigned int __user *)(unsigned long)mask,
                          &request->mask))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_STIPPLE, (unsigned long)request);
}

typedef struct drm_radeon_tex_image32 {
        unsigned int x, y;      /* Blit coordinates */
        unsigned int width, height;
        u32 data;
} drm_radeon_tex_image32_t;

typedef struct drm_radeon_texture32 {
        unsigned int offset;
        int pitch;
        int format;
        int width;              /* Texture image coordinates */
        int height;
        u32 image;
} drm_radeon_texture32_t;

static int compat_radeon_cp_texture(struct file *file, unsigned int cmd,
                                    unsigned long arg)
{
        drm_radeon_texture32_t req32;
        drm_radeon_texture_t __user *request;
        drm_radeon_tex_image32_t img32;
        drm_radeon_tex_image_t __user *image;

        if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
                return -EFAULT;
        if (req32.image == 0)
                return -EINVAL;
        if (copy_from_user(&img32, (void __user *)(unsigned long)req32.image,
                           sizeof(img32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request) + sizeof(*image));
        if (!access_ok(VERIFY_WRITE, request,
                       sizeof(*request) + sizeof(*image)))
                return -EFAULT;
        image = (drm_radeon_tex_image_t __user *) (request + 1);

        if (__put_user(req32.offset, &request->offset)
            || __put_user(req32.pitch, &request->pitch)
            || __put_user(req32.format, &request->format)
            || __put_user(req32.width, &request->width)
            || __put_user(req32.height, &request->height)
            || __put_user(image, &request->image)
            || __put_user(img32.x, &image->x)
            || __put_user(img32.y, &image->y)
            || __put_user(img32.width, &image->width)
            || __put_user(img32.height, &image->height)
            || __put_user((const void __user *)(unsigned long)img32.data,
                          &image->data))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_TEXTURE, (unsigned long)request);
}

typedef struct drm_radeon_vertex2_32 {
        int idx;                /* Index of vertex buffer */
        int discard;            /* Client finished with buffer? */
        int nr_states;
        u32 state;
        int nr_prims;
        u32 prim;
} drm_radeon_vertex2_32_t;

static int compat_radeon_cp_vertex2(struct file *file, unsigned int cmd,
                                    unsigned long arg)
{
        drm_radeon_vertex2_32_t req32;
        drm_radeon_vertex2_t __user *request;

        if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.idx, &request->idx)
            || __put_user(req32.discard, &request->discard)
            || __put_user(req32.nr_states, &request->nr_states)
            || __put_user((void __user *)(unsigned long)req32.state,
                          &request->state)
            || __put_user(req32.nr_prims, &request->nr_prims)
            || __put_user((void __user *)(unsigned long)req32.prim,
                          &request->prim))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_VERTEX2, (unsigned long)request);
}

typedef struct drm_radeon_cmd_buffer32 {
        int bufsz;
        u32 buf;
        int nbox;
        u32 boxes;
} drm_radeon_cmd_buffer32_t;

static int compat_radeon_cp_cmdbuf(struct file *file, unsigned int cmd,
                                   unsigned long arg)
{
        drm_radeon_cmd_buffer32_t req32;
        drm_radeon_cmd_buffer_t __user *request;

        if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.bufsz, &request->bufsz)
            || __put_user((void __user *)(unsigned long)req32.buf,
                          &request->buf)
            || __put_user(req32.nbox, &request->nbox)
            || __put_user((void __user *)(unsigned long)req32.boxes,
                          &request->boxes))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_CMDBUF, (unsigned long)request);
}

typedef struct drm_radeon_getparam32 {
        int param;
        u32 value;
} drm_radeon_getparam32_t;

static int compat_radeon_cp_getparam(struct file *file, unsigned int cmd,
                                     unsigned long arg)
{
        drm_radeon_getparam32_t req32;
        drm_radeon_getparam_t __user *request;

        if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.param, &request->param)
            || __put_user((void __user *)(unsigned long)req32.value,
                          &request->value))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_GETPARAM, (unsigned long)request);
}

typedef struct drm_radeon_mem_alloc32 {
        int region;
        int alignment;
        int size;
        u32 region_offset;      /* offset from start of fb or GART */
} drm_radeon_mem_alloc32_t;

static int compat_radeon_mem_alloc(struct file *file, unsigned int cmd,
                                   unsigned long arg)
{
        drm_radeon_mem_alloc32_t req32;
        drm_radeon_mem_alloc_t __user *request;

        if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.region, &request->region)
            || __put_user(req32.alignment, &request->alignment)
            || __put_user(req32.size, &request->size)
            || __put_user((int __user *)(unsigned long)req32.region_offset,
                          &request->region_offset))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_ALLOC, (unsigned long)request);
}

typedef struct drm_radeon_irq_emit32 {
        u32 irq_seq;
} drm_radeon_irq_emit32_t;

static int compat_radeon_irq_emit(struct file *file, unsigned int cmd,
                                  unsigned long arg)
{
        drm_radeon_irq_emit32_t req32;
        drm_radeon_irq_emit_t __user *request;

        if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user((int __user *)(unsigned long)req32.irq_seq,
                          &request->irq_seq))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_IRQ_EMIT, (unsigned long)request);
}

/* The two 64-bit arches where alignof(u64)==4 in 32-bit code */
#if defined (CONFIG_X86_64) || defined(CONFIG_IA64)
typedef struct drm_radeon_setparam32 {
        int param;
        u64 value;
} __attribute__((packed)) drm_radeon_setparam32_t;

static int compat_radeon_cp_setparam(struct file *file, unsigned int cmd,
                                     unsigned long arg)
{
        drm_radeon_setparam32_t req32;
        drm_radeon_setparam_t __user *request;

        if (copy_from_user(&req32, (void __user *) arg, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.param, &request->param)
            || __put_user((void __user *)(unsigned long)req32.value,
                          &request->value))
                return -EFAULT;

        return drm_ioctl(file, DRM_IOCTL_RADEON_SETPARAM, (unsigned long) request);
}
#else
#define compat_radeon_cp_setparam NULL
#endif /* X86_64 || IA64 */

static drm_ioctl_compat_t *radeon_compat_ioctls[] = {
        [DRM_RADEON_CP_INIT] = compat_radeon_cp_init,
        [DRM_RADEON_CLEAR] = compat_radeon_cp_clear,
        [DRM_RADEON_STIPPLE] = compat_radeon_cp_stipple,
        [DRM_RADEON_TEXTURE] = compat_radeon_cp_texture,
        [DRM_RADEON_VERTEX2] = compat_radeon_cp_vertex2,
        [DRM_RADEON_CMDBUF] = compat_radeon_cp_cmdbuf,
        [DRM_RADEON_GETPARAM] = compat_radeon_cp_getparam,
        [DRM_RADEON_SETPARAM] = compat_radeon_cp_setparam,
        [DRM_RADEON_ALLOC] = compat_radeon_mem_alloc,
        [DRM_RADEON_IRQ_EMIT] = compat_radeon_irq_emit,
};

/**
 * Called whenever a 32-bit process running under a 64-bit kernel
 * performs an ioctl on /dev/dri/card<n>.
 *
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 */
long radeon_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        unsigned int nr = DRM_IOCTL_NR(cmd);
        drm_ioctl_compat_t *fn = NULL;
        int ret;

        if (nr < DRM_COMMAND_BASE)
                return drm_compat_ioctl(filp, cmd, arg);

        if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(radeon_compat_ioctls))
                fn = radeon_compat_ioctls[nr - DRM_COMMAND_BASE];

        if (fn != NULL)
                ret = (*fn) (filp, cmd, arg);
        else
                ret = drm_ioctl(filp, cmd, arg);

        return ret;
}

long radeon_kms_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        unsigned int nr = DRM_IOCTL_NR(cmd);
        int ret;

        if (nr < DRM_COMMAND_BASE)
                return drm_compat_ioctl(filp, cmd, arg);

        ret = radeon_drm_ioctl(filp, cmd, arg);

        return ret;
}