ext2: trivial indentation fix.

[linux-2.6/verdex.git] / drivers / char / drm / via_dma.c

/* via_dma.c -- DMA support for the VIA Unichrome/Pro
 *
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Copyright 2004 Digeo, Inc., Palo Alto, CA, U.S.A.
 * All Rights Reserved.
 *
 * Copyright 2004 The Unichrome project.
 * 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, sub license,
 * 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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.
 *
 * Authors:
 *    Tungsten Graphics,
 *    Erdi Chen,
 *    Thomas Hellstrom.
 */

#include "drmP.h"
#include "drm.h"
#include "via_drm.h"
#include "via_drv.h"
#include "via_3d_reg.h"

#define CMDBUF_ALIGNMENT_SIZE   (0x100)
#define CMDBUF_ALIGNMENT_MASK   (0x0ff)

/* defines for VIA 3D registers */
#define VIA_REG_STATUS          0x400
#define VIA_REG_TRANSET         0x43C
#define VIA_REG_TRANSPACE       0x440

/* VIA_REG_STATUS(0x400): Engine Status */
#define VIA_CMD_RGTR_BUSY       0x00000080      /* Command Regulator is busy */
#define VIA_2D_ENG_BUSY         0x00000001      /* 2D Engine is busy */
#define VIA_3D_ENG_BUSY         0x00000002      /* 3D Engine is busy */
#define VIA_VR_QUEUE_BUSY       0x00020000      /* Virtual Queue is busy */

#define SetReg2DAGP(nReg, nData) {                              \
        *((uint32_t *)(vb)) = ((nReg) >> 2) | HALCYON_HEADER1;  \
        *((uint32_t *)(vb) + 1) = (nData);                      \
        vb = ((uint32_t *)vb) + 2;                              \
        dev_priv->dma_low +=8;                                  \
}

#define via_flush_write_combine() DRM_MEMORYBARRIER()

#define VIA_OUT_RING_QW(w1,w2)                  \
        *vb++ = (w1);                           \
        *vb++ = (w2);                           \
        dev_priv->dma_low += 8;

static void via_cmdbuf_start(drm_via_private_t * dev_priv);
static void via_cmdbuf_pause(drm_via_private_t * dev_priv);
static void via_cmdbuf_reset(drm_via_private_t * dev_priv);
static void via_cmdbuf_rewind(drm_via_private_t * dev_priv);
static int via_wait_idle(drm_via_private_t * dev_priv);
static void via_pad_cache(drm_via_private_t * dev_priv, int qwords);

/*
 * Free space in command buffer.
 */

static uint32_t via_cmdbuf_space(drm_via_private_t * dev_priv)
{
        uint32_t agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
        uint32_t hw_addr = *(dev_priv->hw_addr_ptr) - agp_base;

        return ((hw_addr <= dev_priv->dma_low) ?
                (dev_priv->dma_high + hw_addr - dev_priv->dma_low) :
                (hw_addr - dev_priv->dma_low));
}

/*
 * How much does the command regulator lag behind?
 */

static uint32_t via_cmdbuf_lag(drm_via_private_t * dev_priv)
{
        uint32_t agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
        uint32_t hw_addr = *(dev_priv->hw_addr_ptr) - agp_base;

        return ((hw_addr <= dev_priv->dma_low) ?
                (dev_priv->dma_low - hw_addr) :
                (dev_priv->dma_wrap + dev_priv->dma_low - hw_addr));
}

/*
 * Check that the given size fits in the buffer, otherwise wait.
 */

static inline int
via_cmdbuf_wait(drm_via_private_t * dev_priv, unsigned int size)
{
        uint32_t agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
        uint32_t cur_addr, hw_addr, next_addr;
        volatile uint32_t *hw_addr_ptr;
        uint32_t count;
        hw_addr_ptr = dev_priv->hw_addr_ptr;
        cur_addr = dev_priv->dma_low;
        next_addr = cur_addr + size + 512 * 1024;
        count = 1000000;
        do {
                hw_addr = *hw_addr_ptr - agp_base;
                if (count-- == 0) {
                        DRM_ERROR
                            ("via_cmdbuf_wait timed out hw %x cur_addr %x next_addr %x\n",
                             hw_addr, cur_addr, next_addr);
                        return -1;
                }
        } while ((cur_addr < hw_addr) && (next_addr >= hw_addr));
        return 0;
}

/*
 * Checks whether buffer head has reach the end. Rewind the ring buffer
 * when necessary.
 *
 * Returns virtual pointer to ring buffer.
 */

static inline uint32_t *via_check_dma(drm_via_private_t * dev_priv,
                                      unsigned int size)
{
        if ((dev_priv->dma_low + size + 4 * CMDBUF_ALIGNMENT_SIZE) >
            dev_priv->dma_high) {
                via_cmdbuf_rewind(dev_priv);
        }
        if (via_cmdbuf_wait(dev_priv, size) != 0) {
                return NULL;
        }

        return (uint32_t *) (dev_priv->dma_ptr + dev_priv->dma_low);
}

int via_dma_cleanup(drm_device_t * dev)
{
        if (dev->dev_private) {
                drm_via_private_t *dev_priv =
                    (drm_via_private_t *) dev->dev_private;

                if (dev_priv->ring.virtual_start) {
                        via_cmdbuf_reset(dev_priv);

                        drm_core_ioremapfree(&dev_priv->ring.map, dev);
                        dev_priv->ring.virtual_start = NULL;
                }

        }

        return 0;
}

static int via_initialize(drm_device_t * dev,
                          drm_via_private_t * dev_priv,
                          drm_via_dma_init_t * init)
{
        if (!dev_priv || !dev_priv->mmio) {
                DRM_ERROR("via_dma_init called before via_map_init\n");
                return DRM_ERR(EFAULT);
        }

        if (dev_priv->ring.virtual_start != NULL) {
                DRM_ERROR("%s called again without calling cleanup\n",
                          __FUNCTION__);
                return DRM_ERR(EFAULT);
        }

        if (!dev->agp || !dev->agp->base) {
                DRM_ERROR("%s called with no agp memory available\n",
                          __FUNCTION__);
                return DRM_ERR(EFAULT);
        }

        dev_priv->ring.map.offset = dev->agp->base + init->offset;
        dev_priv->ring.map.size = init->size;
        dev_priv->ring.map.type = 0;
        dev_priv->ring.map.flags = 0;
        dev_priv->ring.map.mtrr = 0;

        drm_core_ioremap(&dev_priv->ring.map, dev);

        if (dev_priv->ring.map.handle == NULL) {
                via_dma_cleanup(dev);
                DRM_ERROR("can not ioremap virtual address for"
                          " ring buffer\n");
                return DRM_ERR(ENOMEM);
        }

        dev_priv->ring.virtual_start = dev_priv->ring.map.handle;

        dev_priv->dma_ptr = dev_priv->ring.virtual_start;
        dev_priv->dma_low = 0;
        dev_priv->dma_high = init->size;
        dev_priv->dma_wrap = init->size;
        dev_priv->dma_offset = init->offset;
        dev_priv->last_pause_ptr = NULL;
        dev_priv->hw_addr_ptr = dev_priv->mmio->handle + init->reg_pause_addr;

        via_cmdbuf_start(dev_priv);

        return 0;
}

int via_dma_init(DRM_IOCTL_ARGS)
{
        DRM_DEVICE;
        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
        drm_via_dma_init_t init;
        int retcode = 0;

        DRM_COPY_FROM_USER_IOCTL(init, (drm_via_dma_init_t __user *) data,
                                 sizeof(init));

        switch (init.func) {
        case VIA_INIT_DMA:
                if (!capable(CAP_SYS_ADMIN))
                        retcode = DRM_ERR(EPERM);
                else
                        retcode = via_initialize(dev, dev_priv, &init);
                break;
        case VIA_CLEANUP_DMA:
                if (!capable(CAP_SYS_ADMIN))
                        retcode = DRM_ERR(EPERM);
                else
                        retcode = via_dma_cleanup(dev);
                break;
        case VIA_DMA_INITIALIZED:
                retcode = (dev_priv->ring.virtual_start != NULL) ?
                    0 : DRM_ERR(EFAULT);
                break;
        default:
                retcode = DRM_ERR(EINVAL);
                break;
        }

        return retcode;
}

static int via_dispatch_cmdbuffer(drm_device_t * dev, drm_via_cmdbuffer_t * cmd)
{
        drm_via_private_t *dev_priv;
        uint32_t *vb;
        int ret;

        dev_priv = (drm_via_private_t *) dev->dev_private;

        if (dev_priv->ring.virtual_start == NULL) {
                DRM_ERROR("%s called without initializing AGP ring buffer.\n",
                          __FUNCTION__);
                return DRM_ERR(EFAULT);
        }

        if (cmd->size > VIA_PCI_BUF_SIZE) {
                return DRM_ERR(ENOMEM);
        }

        if (DRM_COPY_FROM_USER(dev_priv->pci_buf, cmd->buf, cmd->size))
                return DRM_ERR(EFAULT);

        /*
         * Running this function on AGP memory is dead slow. Therefore
         * we run it on a temporary cacheable system memory buffer and
         * copy it to AGP memory when ready.
         */

        if ((ret =
             via_verify_command_stream((uint32_t *) dev_priv->pci_buf,
                                       cmd->size, dev, 1))) {
                return ret;
        }

        vb = via_check_dma(dev_priv, (cmd->size < 0x100) ? 0x102 : cmd->size);
        if (vb == NULL) {
                return DRM_ERR(EAGAIN);
        }

        memcpy(vb, dev_priv->pci_buf, cmd->size);

        dev_priv->dma_low += cmd->size;

        /*
         * Small submissions somehow stalls the CPU. (AGP cache effects?)
         * pad to greater size.
         */

        if (cmd->size < 0x100)
                via_pad_cache(dev_priv, (0x100 - cmd->size) >> 3);
        via_cmdbuf_pause(dev_priv);

        return 0;
}

int via_driver_dma_quiescent(drm_device_t * dev)
{
        drm_via_private_t *dev_priv = dev->dev_private;

        if (!via_wait_idle(dev_priv)) {
                return DRM_ERR(EBUSY);
        }
        return 0;
}

int via_flush_ioctl(DRM_IOCTL_ARGS)
{
        DRM_DEVICE;

        LOCK_TEST_WITH_RETURN(dev, filp);

        return via_driver_dma_quiescent(dev);
}

int via_cmdbuffer(DRM_IOCTL_ARGS)
{
        DRM_DEVICE;
        drm_via_cmdbuffer_t cmdbuf;
        int ret;

        LOCK_TEST_WITH_RETURN(dev, filp);

        DRM_COPY_FROM_USER_IOCTL(cmdbuf, (drm_via_cmdbuffer_t __user *) data,
                                 sizeof(cmdbuf));

        DRM_DEBUG("via cmdbuffer, buf %p size %lu\n", cmdbuf.buf, cmdbuf.size);

        ret = via_dispatch_cmdbuffer(dev, &cmdbuf);
        if (ret) {
                return ret;
        }

        return 0;
}

extern int
via_parse_command_stream(drm_device_t * dev, const uint32_t * buf,
                         unsigned int size);
static int via_dispatch_pci_cmdbuffer(drm_device_t * dev,
                                      drm_via_cmdbuffer_t * cmd)
{
        drm_via_private_t *dev_priv = dev->dev_private;
        int ret;

        if (cmd->size > VIA_PCI_BUF_SIZE) {
                return DRM_ERR(ENOMEM);
        }
        if (DRM_COPY_FROM_USER(dev_priv->pci_buf, cmd->buf, cmd->size))
                return DRM_ERR(EFAULT);

        if ((ret =
             via_verify_command_stream((uint32_t *) dev_priv->pci_buf,
                                       cmd->size, dev, 0))) {
                return ret;
        }

        ret =
            via_parse_command_stream(dev, (const uint32_t *)dev_priv->pci_buf,
                                     cmd->size);
        return ret;
}

int via_pci_cmdbuffer(DRM_IOCTL_ARGS)
{
        DRM_DEVICE;
        drm_via_cmdbuffer_t cmdbuf;
        int ret;

        LOCK_TEST_WITH_RETURN(dev, filp);

        DRM_COPY_FROM_USER_IOCTL(cmdbuf, (drm_via_cmdbuffer_t __user *) data,
                                 sizeof(cmdbuf));

        DRM_DEBUG("via_pci_cmdbuffer, buf %p size %lu\n", cmdbuf.buf,
                  cmdbuf.size);

        ret = via_dispatch_pci_cmdbuffer(dev, &cmdbuf);
        if (ret) {
                return ret;
        }

        return 0;
}

static inline uint32_t *via_align_buffer(drm_via_private_t * dev_priv,
                                         uint32_t * vb, int qw_count)
{
        for (; qw_count > 0; --qw_count) {
                VIA_OUT_RING_QW(HC_DUMMY, HC_DUMMY);
        }
        return vb;
}

/*
 * This function is used internally by ring buffer mangement code.
 *
 * Returns virtual pointer to ring buffer.
 */
static inline uint32_t *via_get_dma(drm_via_private_t * dev_priv)
{
        return (uint32_t *) (dev_priv->dma_ptr + dev_priv->dma_low);
}

/*
 * Hooks a segment of data into the tail of the ring-buffer by
 * modifying the pause address stored in the buffer itself. If
 * the regulator has already paused, restart it.
 */
static int via_hook_segment(drm_via_private_t * dev_priv,
                            uint32_t pause_addr_hi, uint32_t pause_addr_lo,
                            int no_pci_fire)
{
        int paused, count;
        volatile uint32_t *paused_at = dev_priv->last_pause_ptr;

        via_flush_write_combine();
        while (!*(via_get_dma(dev_priv) - 1)) ;
        *dev_priv->last_pause_ptr = pause_addr_lo;
        via_flush_write_combine();

        /*
         * The below statement is inserted to really force the flush.
         * Not sure it is needed.
         */

        while (!*dev_priv->last_pause_ptr) ;
        dev_priv->last_pause_ptr = via_get_dma(dev_priv) - 1;
        while (!*dev_priv->last_pause_ptr) ;

        paused = 0;
        count = 20;

        while (!(paused = (VIA_READ(0x41c) & 0x80000000)) && count--) ;
        if ((count <= 8) && (count >= 0)) {
                uint32_t rgtr, ptr;
                rgtr = *(dev_priv->hw_addr_ptr);
                ptr = ((char *)dev_priv->last_pause_ptr - dev_priv->dma_ptr) +
                    dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4 -
                    CMDBUF_ALIGNMENT_SIZE;
                if (rgtr <= ptr) {
                        DRM_ERROR
                            ("Command regulator\npaused at count %d, address %x, "
                             "while current pause address is %x.\n"
                             "Please mail this message to "
                             "<unichrome-devel@lists.sourceforge.net>\n", count,
                             rgtr, ptr);
                }
        }

        if (paused && !no_pci_fire) {
                uint32_t rgtr, ptr;
                uint32_t ptr_low;

                count = 1000000;
                while ((VIA_READ(VIA_REG_STATUS) & VIA_CMD_RGTR_BUSY)
                       && count--) ;

                rgtr = *(dev_priv->hw_addr_ptr);
                ptr = ((char *)paused_at - dev_priv->dma_ptr) +
                    dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4;

                ptr_low = (ptr > 3 * CMDBUF_ALIGNMENT_SIZE) ?
                    ptr - 3 * CMDBUF_ALIGNMENT_SIZE : 0;
                if (rgtr <= ptr && rgtr >= ptr_low) {
                        VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
                        VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
                        VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);
                }
        }
        return paused;
}

static int via_wait_idle(drm_via_private_t * dev_priv)
{
        int count = 10000000;
        while (count-- && (VIA_READ(VIA_REG_STATUS) &
                           (VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY |
                            VIA_3D_ENG_BUSY))) ;
        return count;
}

static uint32_t *via_align_cmd(drm_via_private_t * dev_priv, uint32_t cmd_type,
                               uint32_t addr, uint32_t * cmd_addr_hi,
                               uint32_t * cmd_addr_lo, int skip_wait)
{
        uint32_t agp_base;
        uint32_t cmd_addr, addr_lo, addr_hi;
        uint32_t *vb;
        uint32_t qw_pad_count;

        if (!skip_wait)
                via_cmdbuf_wait(dev_priv, 2 * CMDBUF_ALIGNMENT_SIZE);

        vb = via_get_dma(dev_priv);
        VIA_OUT_RING_QW(HC_HEADER2 | ((VIA_REG_TRANSET >> 2) << 12) |
                        (VIA_REG_TRANSPACE >> 2), HC_ParaType_PreCR << 16);
        agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
        qw_pad_count = (CMDBUF_ALIGNMENT_SIZE >> 3) -
            ((dev_priv->dma_low & CMDBUF_ALIGNMENT_MASK) >> 3);

        cmd_addr = (addr) ? addr :
            agp_base + dev_priv->dma_low - 8 + (qw_pad_count << 3);
        addr_lo = ((HC_SubA_HAGPBpL << 24) | (cmd_type & HC_HAGPBpID_MASK) |
                   (cmd_addr & HC_HAGPBpL_MASK));
        addr_hi = ((HC_SubA_HAGPBpH << 24) | (cmd_addr >> 24));

        vb = via_align_buffer(dev_priv, vb, qw_pad_count - 1);
        VIA_OUT_RING_QW(*cmd_addr_hi = addr_hi, *cmd_addr_lo = addr_lo);
        return vb;
}

static void via_cmdbuf_start(drm_via_private_t * dev_priv)
{
        uint32_t pause_addr_lo, pause_addr_hi;
        uint32_t start_addr, start_addr_lo;
        uint32_t end_addr, end_addr_lo;
        uint32_t command;
        uint32_t agp_base;

        dev_priv->dma_low = 0;

        agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
        start_addr = agp_base;
        end_addr = agp_base + dev_priv->dma_high;

        start_addr_lo = ((HC_SubA_HAGPBstL << 24) | (start_addr & 0xFFFFFF));
        end_addr_lo = ((HC_SubA_HAGPBendL << 24) | (end_addr & 0xFFFFFF));
        command = ((HC_SubA_HAGPCMNT << 24) | (start_addr >> 24) |
                   ((end_addr & 0xff000000) >> 16));

        dev_priv->last_pause_ptr =
            via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0,
                          &pause_addr_hi, &pause_addr_lo, 1) - 1;

        via_flush_write_combine();
        while (!*dev_priv->last_pause_ptr) ;

        VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
        VIA_WRITE(VIA_REG_TRANSPACE, command);
        VIA_WRITE(VIA_REG_TRANSPACE, start_addr_lo);
        VIA_WRITE(VIA_REG_TRANSPACE, end_addr_lo);

        VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
        VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);

        VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK);
}

static void via_pad_cache(drm_via_private_t * dev_priv, int qwords)
{
        uint32_t *vb;

        via_cmdbuf_wait(dev_priv, qwords + 2);
        vb = via_get_dma(dev_priv);
        VIA_OUT_RING_QW(HC_HEADER2, HC_ParaType_NotTex << 16);
        via_align_buffer(dev_priv, vb, qwords);
}

static inline void via_dummy_bitblt(drm_via_private_t * dev_priv)
{
        uint32_t *vb = via_get_dma(dev_priv);
        SetReg2DAGP(0x0C, (0 | (0 << 16)));
        SetReg2DAGP(0x10, 0 | (0 << 16));
        SetReg2DAGP(0x0, 0x1 | 0x2000 | 0xAA000000);
}

static void via_cmdbuf_jump(drm_via_private_t * dev_priv)
{
        uint32_t agp_base;
        uint32_t pause_addr_lo, pause_addr_hi;
        uint32_t jump_addr_lo, jump_addr_hi;
        volatile uint32_t *last_pause_ptr;
        uint32_t dma_low_save1, dma_low_save2;

        agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
        via_align_cmd(dev_priv, HC_HAGPBpID_JUMP, 0, &jump_addr_hi,
                      &jump_addr_lo, 0);

        dev_priv->dma_wrap = dev_priv->dma_low;

        /*
         * Wrap command buffer to the beginning.
         */

        dev_priv->dma_low = 0;
        if (via_cmdbuf_wait(dev_priv, CMDBUF_ALIGNMENT_SIZE) != 0) {
                DRM_ERROR("via_cmdbuf_jump failed\n");
        }

        via_dummy_bitblt(dev_priv);
        via_dummy_bitblt(dev_priv);

        last_pause_ptr =
            via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
                          &pause_addr_lo, 0) - 1;
        via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
                      &pause_addr_lo, 0);

        *last_pause_ptr = pause_addr_lo;
        dma_low_save1 = dev_priv->dma_low;

        /*
         * Now, set a trap that will pause the regulator if it tries to rerun the old
         * command buffer. (Which may happen if via_hook_segment detecs a command regulator pause
         * and reissues the jump command over PCI, while the regulator has already taken the jump
         * and actually paused at the current buffer end).
         * There appears to be no other way to detect this condition, since the hw_addr_pointer
         * does not seem to get updated immediately when a jump occurs.
         */

        last_pause_ptr =
            via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
                          &pause_addr_lo, 0) - 1;
        via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
                      &pause_addr_lo, 0);
        *last_pause_ptr = pause_addr_lo;

        dma_low_save2 = dev_priv->dma_low;
        dev_priv->dma_low = dma_low_save1;
        via_hook_segment(dev_priv, jump_addr_hi, jump_addr_lo, 0);
        dev_priv->dma_low = dma_low_save2;
        via_hook_segment(dev_priv, pause_addr_hi, pause_addr_lo, 0);
}

static void via_cmdbuf_rewind(drm_via_private_t * dev_priv)
{
        via_cmdbuf_jump(dev_priv);
}

static void via_cmdbuf_flush(drm_via_private_t * dev_priv, uint32_t cmd_type)
{
        uint32_t pause_addr_lo, pause_addr_hi;

        via_align_cmd(dev_priv, cmd_type, 0, &pause_addr_hi, &pause_addr_lo, 0);
        via_hook_segment(dev_priv, pause_addr_hi, pause_addr_lo, 0);
}

static void via_cmdbuf_pause(drm_via_private_t * dev_priv)
{
        via_cmdbuf_flush(dev_priv, HC_HAGPBpID_PAUSE);
}

static void via_cmdbuf_reset(drm_via_private_t * dev_priv)
{
        via_cmdbuf_flush(dev_priv, HC_HAGPBpID_STOP);
        via_wait_idle(dev_priv);
}

/*
 * User interface to the space and lag functions.
 */

int via_cmdbuf_size(DRM_IOCTL_ARGS)
{
        DRM_DEVICE;
        drm_via_cmdbuf_size_t d_siz;
        int ret = 0;
        uint32_t tmp_size, count;
        drm_via_private_t *dev_priv;

        DRM_DEBUG("via cmdbuf_size\n");
        LOCK_TEST_WITH_RETURN(dev, filp);

        dev_priv = (drm_via_private_t *) dev->dev_private;

        if (dev_priv->ring.virtual_start == NULL) {
                DRM_ERROR("%s called without initializing AGP ring buffer.\n",
                          __FUNCTION__);
                return DRM_ERR(EFAULT);
        }

        DRM_COPY_FROM_USER_IOCTL(d_siz, (drm_via_cmdbuf_size_t __user *) data,
                                 sizeof(d_siz));

        count = 1000000;
        tmp_size = d_siz.size;
        switch (d_siz.func) {
        case VIA_CMDBUF_SPACE:
                while (((tmp_size = via_cmdbuf_space(dev_priv)) < d_siz.size)
                       && count--) {
                        if (!d_siz.wait) {
                                break;
                        }
                }
                if (!count) {
                        DRM_ERROR("VIA_CMDBUF_SPACE timed out.\n");
                        ret = DRM_ERR(EAGAIN);
                }
                break;
        case VIA_CMDBUF_LAG:
                while (((tmp_size = via_cmdbuf_lag(dev_priv)) > d_siz.size)
                       && count--) {
                        if (!d_siz.wait) {
                                break;
                        }
                }
                if (!count) {
                        DRM_ERROR("VIA_CMDBUF_LAG timed out.\n");
                        ret = DRM_ERR(EAGAIN);
                }
                break;
        default:
                ret = DRM_ERR(EFAULT);
        }
        d_siz.size = tmp_size;

        DRM_COPY_TO_USER_IOCTL((drm_via_cmdbuf_size_t __user *) data, d_siz,
                               sizeof(d_siz));
        return ret;
}