drm/i915: Set up an MTRR covering the GTT at driver load.

[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / i915 / i915_dma.c

/* i915_dma.c -- DMA support for the I915 -*- linux-c -*-
 */
/*
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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 TUNGSTEN GRAPHICS 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 "drmP.h"
#include "drm.h"
#include "drm_crtc_helper.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"

/* Really want an OS-independent resettable timer.  Would like to have
 * this loop run for (eg) 3 sec, but have the timer reset every time
 * the head pointer changes, so that EBUSY only happens if the ring
 * actually stalls for (eg) 3 seconds.
 */
int i915_wait_ring(struct drm_device * dev, int n, const char *caller)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
        drm_i915_ring_buffer_t *ring = &(dev_priv->ring);
        u32 acthd_reg = IS_I965G(dev) ? ACTHD_I965 : ACTHD;
        u32 last_acthd = I915_READ(acthd_reg);
        u32 acthd;
        u32 last_head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
        int i;

        for (i = 0; i < 100000; i++) {
                ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
                acthd = I915_READ(acthd_reg);
                ring->space = ring->head - (ring->tail + 8);
                if (ring->space < 0)
                        ring->space += ring->Size;
                if (ring->space >= n)
                        return 0;

                if (master_priv->sarea_priv)
                        master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;

                if (ring->head != last_head)
                        i = 0;
                if (acthd != last_acthd)
                        i = 0;

                last_head = ring->head;
                last_acthd = acthd;
                msleep_interruptible(10);

        }

        return -EBUSY;
}

/**
 * Sets up the hardware status page for devices that need a physical address
 * in the register.
 */
static int i915_init_phys_hws(struct drm_device *dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        /* Program Hardware Status Page */
        dev_priv->status_page_dmah =
                drm_pci_alloc(dev, PAGE_SIZE, PAGE_SIZE, 0xffffffff);

        if (!dev_priv->status_page_dmah) {
                DRM_ERROR("Can not allocate hardware status page\n");
                return -ENOMEM;
        }
        dev_priv->hw_status_page = dev_priv->status_page_dmah->vaddr;
        dev_priv->dma_status_page = dev_priv->status_page_dmah->busaddr;

        memset(dev_priv->hw_status_page, 0, PAGE_SIZE);

        I915_WRITE(HWS_PGA, dev_priv->dma_status_page);
        DRM_DEBUG("Enabled hardware status page\n");
        return 0;
}

/**
 * Frees the hardware status page, whether it's a physical address or a virtual
 * address set up by the X Server.
 */
static void i915_free_hws(struct drm_device *dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        if (dev_priv->status_page_dmah) {
                drm_pci_free(dev, dev_priv->status_page_dmah);
                dev_priv->status_page_dmah = NULL;
        }

        if (dev_priv->status_gfx_addr) {
                dev_priv->status_gfx_addr = 0;
                drm_core_ioremapfree(&dev_priv->hws_map, dev);
        }

        /* Need to rewrite hardware status page */
        I915_WRITE(HWS_PGA, 0x1ffff000);
}

void i915_kernel_lost_context(struct drm_device * dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv;
        drm_i915_ring_buffer_t *ring = &(dev_priv->ring);

        /*
         * We should never lose context on the ring with modesetting
         * as we don't expose it to userspace
         */
        if (drm_core_check_feature(dev, DRIVER_MODESET))
                return;

        ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
        ring->tail = I915_READ(PRB0_TAIL) & TAIL_ADDR;
        ring->space = ring->head - (ring->tail + 8);
        if (ring->space < 0)
                ring->space += ring->Size;

        if (!dev->primary->master)
                return;

        master_priv = dev->primary->master->driver_priv;
        if (ring->head == ring->tail && master_priv->sarea_priv)
                master_priv->sarea_priv->perf_boxes |= I915_BOX_RING_EMPTY;
}

static int i915_dma_cleanup(struct drm_device * dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        /* Make sure interrupts are disabled here because the uninstall ioctl
         * may not have been called from userspace and after dev_private
         * is freed, it's too late.
         */
        if (dev->irq_enabled)
                drm_irq_uninstall(dev);

        if (dev_priv->ring.virtual_start) {
                drm_core_ioremapfree(&dev_priv->ring.map, dev);
                dev_priv->ring.virtual_start = NULL;
                dev_priv->ring.map.handle = NULL;
                dev_priv->ring.map.size = 0;
        }

        /* Clear the HWS virtual address at teardown */
        if (I915_NEED_GFX_HWS(dev))
                i915_free_hws(dev);

        return 0;
}

static int i915_initialize(struct drm_device * dev, drm_i915_init_t * init)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;

        master_priv->sarea = drm_getsarea(dev);
        if (master_priv->sarea) {
                master_priv->sarea_priv = (drm_i915_sarea_t *)
                        ((u8 *)master_priv->sarea->handle + init->sarea_priv_offset);
        } else {
                DRM_DEBUG("sarea not found assuming DRI2 userspace\n");
        }

        if (init->ring_size != 0) {
                if (dev_priv->ring.ring_obj != NULL) {
                        i915_dma_cleanup(dev);
                        DRM_ERROR("Client tried to initialize ringbuffer in "
                                  "GEM mode\n");
                        return -EINVAL;
                }

                dev_priv->ring.Size = init->ring_size;
                dev_priv->ring.tail_mask = dev_priv->ring.Size - 1;

                dev_priv->ring.map.offset = init->ring_start;
                dev_priv->ring.map.size = init->ring_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) {
                        i915_dma_cleanup(dev);
                        DRM_ERROR("can not ioremap virtual address for"
                                  " ring buffer\n");
                        return -ENOMEM;
                }
        }

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

        dev_priv->cpp = init->cpp;
        dev_priv->back_offset = init->back_offset;
        dev_priv->front_offset = init->front_offset;
        dev_priv->current_page = 0;
        if (master_priv->sarea_priv)
                master_priv->sarea_priv->pf_current_page = 0;

        /* Allow hardware batchbuffers unless told otherwise.
         */
        dev_priv->allow_batchbuffer = 1;

        return 0;
}

static int i915_dma_resume(struct drm_device * dev)
{
        drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

        DRM_DEBUG("%s\n", __func__);

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

        /* Program Hardware Status Page */
        if (!dev_priv->hw_status_page) {
                DRM_ERROR("Can not find hardware status page\n");
                return -EINVAL;
        }
        DRM_DEBUG("hw status page @ %p\n", dev_priv->hw_status_page);

        if (dev_priv->status_gfx_addr != 0)
                I915_WRITE(HWS_PGA, dev_priv->status_gfx_addr);
        else
                I915_WRITE(HWS_PGA, dev_priv->dma_status_page);
        DRM_DEBUG("Enabled hardware status page\n");

        return 0;
}

static int i915_dma_init(struct drm_device *dev, void *data,
                         struct drm_file *file_priv)
{
        drm_i915_init_t *init = data;
        int retcode = 0;

        switch (init->func) {
        case I915_INIT_DMA:
                retcode = i915_initialize(dev, init);
                break;
        case I915_CLEANUP_DMA:
                retcode = i915_dma_cleanup(dev);
                break;
        case I915_RESUME_DMA:
                retcode = i915_dma_resume(dev);
                break;
        default:
                retcode = -EINVAL;
                break;
        }

        return retcode;
}

/* Implement basically the same security restrictions as hardware does
 * for MI_BATCH_NON_SECURE.  These can be made stricter at any time.
 *
 * Most of the calculations below involve calculating the size of a
 * particular instruction.  It's important to get the size right as
 * that tells us where the next instruction to check is.  Any illegal
 * instruction detected will be given a size of zero, which is a
 * signal to abort the rest of the buffer.
 */
static int do_validate_cmd(int cmd)
{
        switch (((cmd >> 29) & 0x7)) {
        case 0x0:
                switch ((cmd >> 23) & 0x3f) {
                case 0x0:
                        return 1;       /* MI_NOOP */
                case 0x4:
                        return 1;       /* MI_FLUSH */
                default:
                        return 0;       /* disallow everything else */
                }
                break;
        case 0x1:
                return 0;       /* reserved */
        case 0x2:
                return (cmd & 0xff) + 2;        /* 2d commands */
        case 0x3:
                if (((cmd >> 24) & 0x1f) <= 0x18)
                        return 1;

                switch ((cmd >> 24) & 0x1f) {
                case 0x1c:
                        return 1;
                case 0x1d:
                        switch ((cmd >> 16) & 0xff) {
                        case 0x3:
                                return (cmd & 0x1f) + 2;
                        case 0x4:
                                return (cmd & 0xf) + 2;
                        default:
                                return (cmd & 0xffff) + 2;
                        }
                case 0x1e:
                        if (cmd & (1 << 23))
                                return (cmd & 0xffff) + 1;
                        else
                                return 1;
                case 0x1f:
                        if ((cmd & (1 << 23)) == 0)     /* inline vertices */
                                return (cmd & 0x1ffff) + 2;
                        else if (cmd & (1 << 17))       /* indirect random */
                                if ((cmd & 0xffff) == 0)
                                        return 0;       /* unknown length, too hard */
                                else
                                        return (((cmd & 0xffff) + 1) / 2) + 1;
                        else
                                return 2;       /* indirect sequential */
                default:
                        return 0;
                }
        default:
                return 0;
        }

        return 0;
}

static int validate_cmd(int cmd)
{
        int ret = do_validate_cmd(cmd);

/*      printk("validate_cmd( %x ): %d\n", cmd, ret); */

        return ret;
}

static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwords)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        int i;
        RING_LOCALS;

        if ((dwords+1) * sizeof(int) >= dev_priv->ring.Size - 8)
                return -EINVAL;

        BEGIN_LP_RING((dwords+1)&~1);

        for (i = 0; i < dwords;) {
                int cmd, sz;

                if (DRM_COPY_FROM_USER_UNCHECKED(&cmd, &buffer[i], sizeof(cmd)))
                        return -EINVAL;

                if ((sz = validate_cmd(cmd)) == 0 || i + sz > dwords)
                        return -EINVAL;

                OUT_RING(cmd);

                while (++i, --sz) {
                        if (DRM_COPY_FROM_USER_UNCHECKED(&cmd, &buffer[i],
                                                         sizeof(cmd))) {
                                return -EINVAL;
                        }
                        OUT_RING(cmd);
                }
        }

        if (dwords & 1)
                OUT_RING(0);

        ADVANCE_LP_RING();

        return 0;
}

int
i915_emit_box(struct drm_device *dev,
              struct drm_clip_rect __user *boxes,
              int i, int DR1, int DR4)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_clip_rect box;
        RING_LOCALS;

        if (DRM_COPY_FROM_USER_UNCHECKED(&box, &boxes[i], sizeof(box))) {
                return -EFAULT;
        }

        if (box.y2 <= box.y1 || box.x2 <= box.x1 || box.y2 <= 0 || box.x2 <= 0) {
                DRM_ERROR("Bad box %d,%d..%d,%d\n",
                          box.x1, box.y1, box.x2, box.y2);
                return -EINVAL;
        }

        if (IS_I965G(dev)) {
                BEGIN_LP_RING(4);
                OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
                OUT_RING((box.x1 & 0xffff) | (box.y1 << 16));
                OUT_RING(((box.x2 - 1) & 0xffff) | ((box.y2 - 1) << 16));
                OUT_RING(DR4);
                ADVANCE_LP_RING();
        } else {
                BEGIN_LP_RING(6);
                OUT_RING(GFX_OP_DRAWRECT_INFO);
                OUT_RING(DR1);
                OUT_RING((box.x1 & 0xffff) | (box.y1 << 16));
                OUT_RING(((box.x2 - 1) & 0xffff) | ((box.y2 - 1) << 16));
                OUT_RING(DR4);
                OUT_RING(0);
                ADVANCE_LP_RING();
        }

        return 0;
}

/* XXX: Emitting the counter should really be moved to part of the IRQ
 * emit. For now, do it in both places:
 */

static void i915_emit_breadcrumb(struct drm_device *dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
        RING_LOCALS;

        dev_priv->counter++;
        if (dev_priv->counter > 0x7FFFFFFFUL)
                dev_priv->counter = 0;
        if (master_priv->sarea_priv)
                master_priv->sarea_priv->last_enqueue = dev_priv->counter;

        BEGIN_LP_RING(4);
        OUT_RING(MI_STORE_DWORD_INDEX);
        OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
        OUT_RING(dev_priv->counter);
        OUT_RING(0);
        ADVANCE_LP_RING();
}

static int i915_dispatch_cmdbuffer(struct drm_device * dev,
                                   drm_i915_cmdbuffer_t * cmd)
{
        int nbox = cmd->num_cliprects;
        int i = 0, count, ret;

        if (cmd->sz & 0x3) {
                DRM_ERROR("alignment");
                return -EINVAL;
        }

        i915_kernel_lost_context(dev);

        count = nbox ? nbox : 1;

        for (i = 0; i < count; i++) {
                if (i < nbox) {
                        ret = i915_emit_box(dev, cmd->cliprects, i,
                                            cmd->DR1, cmd->DR4);
                        if (ret)
                                return ret;
                }

                ret = i915_emit_cmds(dev, (int __user *)cmd->buf, cmd->sz / 4);
                if (ret)
                        return ret;
        }

        i915_emit_breadcrumb(dev);
        return 0;
}

static int i915_dispatch_batchbuffer(struct drm_device * dev,
                                     drm_i915_batchbuffer_t * batch)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_clip_rect __user *boxes = batch->cliprects;
        int nbox = batch->num_cliprects;
        int i = 0, count;
        RING_LOCALS;

        if ((batch->start | batch->used) & 0x7) {
                DRM_ERROR("alignment");
                return -EINVAL;
        }

        i915_kernel_lost_context(dev);

        count = nbox ? nbox : 1;

        for (i = 0; i < count; i++) {
                if (i < nbox) {
                        int ret = i915_emit_box(dev, boxes, i,
                                                batch->DR1, batch->DR4);
                        if (ret)
                                return ret;
                }

                if (!IS_I830(dev) && !IS_845G(dev)) {
                        BEGIN_LP_RING(2);
                        if (IS_I965G(dev)) {
                                OUT_RING(MI_BATCH_BUFFER_START | (2 << 6) | MI_BATCH_NON_SECURE_I965);
                                OUT_RING(batch->start);
                        } else {
                                OUT_RING(MI_BATCH_BUFFER_START | (2 << 6));
                                OUT_RING(batch->start | MI_BATCH_NON_SECURE);
                        }
                        ADVANCE_LP_RING();
                } else {
                        BEGIN_LP_RING(4);
                        OUT_RING(MI_BATCH_BUFFER);
                        OUT_RING(batch->start | MI_BATCH_NON_SECURE);
                        OUT_RING(batch->start + batch->used - 4);
                        OUT_RING(0);
                        ADVANCE_LP_RING();
                }
        }

        i915_emit_breadcrumb(dev);

        return 0;
}

static int i915_dispatch_flip(struct drm_device * dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv =
                dev->primary->master->driver_priv;
        RING_LOCALS;

        if (!master_priv->sarea_priv)
                return -EINVAL;

        DRM_DEBUG("%s: page=%d pfCurrentPage=%d\n",
                  __func__,
                  dev_priv->current_page,
                  master_priv->sarea_priv->pf_current_page);

        i915_kernel_lost_context(dev);

        BEGIN_LP_RING(2);
        OUT_RING(MI_FLUSH | MI_READ_FLUSH);
        OUT_RING(0);
        ADVANCE_LP_RING();

        BEGIN_LP_RING(6);
        OUT_RING(CMD_OP_DISPLAYBUFFER_INFO | ASYNC_FLIP);
        OUT_RING(0);
        if (dev_priv->current_page == 0) {
                OUT_RING(dev_priv->back_offset);
                dev_priv->current_page = 1;
        } else {
                OUT_RING(dev_priv->front_offset);
                dev_priv->current_page = 0;
        }
        OUT_RING(0);
        ADVANCE_LP_RING();

        BEGIN_LP_RING(2);
        OUT_RING(MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_A_FLIP);
        OUT_RING(0);
        ADVANCE_LP_RING();

        master_priv->sarea_priv->last_enqueue = dev_priv->counter++;

        BEGIN_LP_RING(4);
        OUT_RING(MI_STORE_DWORD_INDEX);
        OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
        OUT_RING(dev_priv->counter);
        OUT_RING(0);
        ADVANCE_LP_RING();

        master_priv->sarea_priv->pf_current_page = dev_priv->current_page;
        return 0;
}

static int i915_quiescent(struct drm_device * dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;

        i915_kernel_lost_context(dev);
        return i915_wait_ring(dev, dev_priv->ring.Size - 8, __func__);
}

static int i915_flush_ioctl(struct drm_device *dev, void *data,
                            struct drm_file *file_priv)
{
        int ret;

        RING_LOCK_TEST_WITH_RETURN(dev, file_priv);

        mutex_lock(&dev->struct_mutex);
        ret = i915_quiescent(dev);
        mutex_unlock(&dev->struct_mutex);

        return ret;
}

static int i915_batchbuffer(struct drm_device *dev, void *data,
                            struct drm_file *file_priv)
{
        drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
        struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
        drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
            master_priv->sarea_priv;
        drm_i915_batchbuffer_t *batch = data;
        int ret;

        if (!dev_priv->allow_batchbuffer) {
                DRM_ERROR("Batchbuffer ioctl disabled\n");
                return -EINVAL;
        }

        DRM_DEBUG("i915 batchbuffer, start %x used %d cliprects %d\n",
                  batch->start, batch->used, batch->num_cliprects);

        RING_LOCK_TEST_WITH_RETURN(dev, file_priv);

        if (batch->num_cliprects && DRM_VERIFYAREA_READ(batch->cliprects,
                                                       batch->num_cliprects *
                                                       sizeof(struct drm_clip_rect)))
                return -EFAULT;

        mutex_lock(&dev->struct_mutex);
        ret = i915_dispatch_batchbuffer(dev, batch);
        mutex_unlock(&dev->struct_mutex);

        if (sarea_priv)
                sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
        return ret;
}

static int i915_cmdbuffer(struct drm_device *dev, void *data,
                          struct drm_file *file_priv)
{
        drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
        struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
        drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
            master_priv->sarea_priv;
        drm_i915_cmdbuffer_t *cmdbuf = data;
        int ret;

        DRM_DEBUG("i915 cmdbuffer, buf %p sz %d cliprects %d\n",
                  cmdbuf->buf, cmdbuf->sz, cmdbuf->num_cliprects);

        RING_LOCK_TEST_WITH_RETURN(dev, file_priv);

        if (cmdbuf->num_cliprects &&
            DRM_VERIFYAREA_READ(cmdbuf->cliprects,
                                cmdbuf->num_cliprects *
                                sizeof(struct drm_clip_rect))) {
                DRM_ERROR("Fault accessing cliprects\n");
                return -EFAULT;
        }

        mutex_lock(&dev->struct_mutex);
        ret = i915_dispatch_cmdbuffer(dev, cmdbuf);
        mutex_unlock(&dev->struct_mutex);
        if (ret) {
                DRM_ERROR("i915_dispatch_cmdbuffer failed\n");
                return ret;
        }

        if (sarea_priv)
                sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
        return 0;
}

static int i915_flip_bufs(struct drm_device *dev, void *data,
                          struct drm_file *file_priv)
{
        int ret;

        DRM_DEBUG("%s\n", __func__);

        RING_LOCK_TEST_WITH_RETURN(dev, file_priv);

        mutex_lock(&dev->struct_mutex);
        ret = i915_dispatch_flip(dev);
        mutex_unlock(&dev->struct_mutex);

        return ret;
}

static int i915_getparam(struct drm_device *dev, void *data,
                         struct drm_file *file_priv)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        drm_i915_getparam_t *param = data;
        int value;

        if (!dev_priv) {
                DRM_ERROR("called with no initialization\n");
                return -EINVAL;
        }

        switch (param->param) {
        case I915_PARAM_IRQ_ACTIVE:
                value = dev->pdev->irq ? 1 : 0;
                break;
        case I915_PARAM_ALLOW_BATCHBUFFER:
                value = dev_priv->allow_batchbuffer ? 1 : 0;
                break;
        case I915_PARAM_LAST_DISPATCH:
                value = READ_BREADCRUMB(dev_priv);
                break;
        case I915_PARAM_CHIPSET_ID:
                value = dev->pci_device;
                break;
        case I915_PARAM_HAS_GEM:
                value = dev_priv->has_gem;
                break;
        default:
                DRM_ERROR("Unknown parameter %d\n", param->param);
                return -EINVAL;
        }

        if (DRM_COPY_TO_USER(param->value, &value, sizeof(int))) {
                DRM_ERROR("DRM_COPY_TO_USER failed\n");
                return -EFAULT;
        }

        return 0;
}

static int i915_setparam(struct drm_device *dev, void *data,
                         struct drm_file *file_priv)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        drm_i915_setparam_t *param = data;

        if (!dev_priv) {
                DRM_ERROR("called with no initialization\n");
                return -EINVAL;
        }

        switch (param->param) {
        case I915_SETPARAM_USE_MI_BATCHBUFFER_START:
                break;
        case I915_SETPARAM_TEX_LRU_LOG_GRANULARITY:
                dev_priv->tex_lru_log_granularity = param->value;
                break;
        case I915_SETPARAM_ALLOW_BATCHBUFFER:
                dev_priv->allow_batchbuffer = param->value;
                break;
        default:
                DRM_ERROR("unknown parameter %d\n", param->param);
                return -EINVAL;
        }

        return 0;
}

static int i915_set_status_page(struct drm_device *dev, void *data,
                                struct drm_file *file_priv)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        drm_i915_hws_addr_t *hws = data;

        if (!I915_NEED_GFX_HWS(dev))
                return -EINVAL;

        if (!dev_priv) {
                DRM_ERROR("called with no initialization\n");
                return -EINVAL;
        }

        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                WARN(1, "tried to set status page when mode setting active\n");
                return 0;
        }

        printk(KERN_DEBUG "set status page addr 0x%08x\n", (u32)hws->addr);

        dev_priv->status_gfx_addr = hws->addr & (0x1ffff<<12);

        dev_priv->hws_map.offset = dev->agp->base + hws->addr;
        dev_priv->hws_map.size = 4*1024;
        dev_priv->hws_map.type = 0;
        dev_priv->hws_map.flags = 0;
        dev_priv->hws_map.mtrr = 0;

        drm_core_ioremap(&dev_priv->hws_map, dev);
        if (dev_priv->hws_map.handle == NULL) {
                i915_dma_cleanup(dev);
                dev_priv->status_gfx_addr = 0;
                DRM_ERROR("can not ioremap virtual address for"
                                " G33 hw status page\n");
                return -ENOMEM;
        }
        dev_priv->hw_status_page = dev_priv->hws_map.handle;

        memset(dev_priv->hw_status_page, 0, PAGE_SIZE);
        I915_WRITE(HWS_PGA, dev_priv->status_gfx_addr);
        DRM_DEBUG("load hws HWS_PGA with gfx mem 0x%x\n",
                        dev_priv->status_gfx_addr);
        DRM_DEBUG("load hws at %p\n", dev_priv->hw_status_page);
        return 0;
}

/**
 * i915_probe_agp - get AGP bootup configuration
 * @pdev: PCI device
 * @aperture_size: returns AGP aperture configured size
 * @preallocated_size: returns size of BIOS preallocated AGP space
 *
 * Since Intel integrated graphics are UMA, the BIOS has to set aside
 * some RAM for the framebuffer at early boot.  This code figures out
 * how much was set aside so we can use it for our own purposes.
 */
static int i915_probe_agp(struct drm_device *dev, unsigned long *aperture_size,
                          unsigned long *preallocated_size)
{
        struct pci_dev *bridge_dev;
        u16 tmp = 0;
        unsigned long overhead;
        unsigned long stolen;

        bridge_dev = pci_get_bus_and_slot(0, PCI_DEVFN(0,0));
        if (!bridge_dev) {
                DRM_ERROR("bridge device not found\n");
                return -1;
        }

        /* Get the fb aperture size and "stolen" memory amount. */
        pci_read_config_word(bridge_dev, INTEL_GMCH_CTRL, &tmp);
        pci_dev_put(bridge_dev);

        *aperture_size = 1024 * 1024;
        *preallocated_size = 1024 * 1024;

        switch (dev->pdev->device) {
        case PCI_DEVICE_ID_INTEL_82830_CGC:
        case PCI_DEVICE_ID_INTEL_82845G_IG:
        case PCI_DEVICE_ID_INTEL_82855GM_IG:
        case PCI_DEVICE_ID_INTEL_82865_IG:
                if ((tmp & INTEL_GMCH_MEM_MASK) == INTEL_GMCH_MEM_64M)
                        *aperture_size *= 64;
                else
                        *aperture_size *= 128;
                break;
        default:
                /* 9xx supports large sizes, just look at the length */
                *aperture_size = pci_resource_len(dev->pdev, 2);
                break;
        }

        /*
         * Some of the preallocated space is taken by the GTT
         * and popup.  GTT is 1K per MB of aperture size, and popup is 4K.
         */
        if (IS_G4X(dev))
                overhead = 4096;
        else
                overhead = (*aperture_size / 1024) + 4096;

        switch (tmp & INTEL_GMCH_GMS_MASK) {
        case INTEL_855_GMCH_GMS_DISABLED:
                DRM_ERROR("video memory is disabled\n");
                return -1;
        case INTEL_855_GMCH_GMS_STOLEN_1M:
                stolen = 1 * 1024 * 1024;
                break;
        case INTEL_855_GMCH_GMS_STOLEN_4M:
                stolen = 4 * 1024 * 1024;
                break;
        case INTEL_855_GMCH_GMS_STOLEN_8M:
                stolen = 8 * 1024 * 1024;
                break;
        case INTEL_855_GMCH_GMS_STOLEN_16M:
                stolen = 16 * 1024 * 1024;
                break;
        case INTEL_855_GMCH_GMS_STOLEN_32M:
                stolen = 32 * 1024 * 1024;
                break;
        case INTEL_915G_GMCH_GMS_STOLEN_48M:
                stolen = 48 * 1024 * 1024;
                break;
        case INTEL_915G_GMCH_GMS_STOLEN_64M:
                stolen = 64 * 1024 * 1024;
                break;
        case INTEL_GMCH_GMS_STOLEN_128M:
                stolen = 128 * 1024 * 1024;
                break;
        case INTEL_GMCH_GMS_STOLEN_256M:
                stolen = 256 * 1024 * 1024;
                break;
        case INTEL_GMCH_GMS_STOLEN_96M:
                stolen = 96 * 1024 * 1024;
                break;
        case INTEL_GMCH_GMS_STOLEN_160M:
                stolen = 160 * 1024 * 1024;
                break;
        case INTEL_GMCH_GMS_STOLEN_224M:
                stolen = 224 * 1024 * 1024;
                break;
        case INTEL_GMCH_GMS_STOLEN_352M:
                stolen = 352 * 1024 * 1024;
                break;
        default:
                DRM_ERROR("unexpected GMCH_GMS value: 0x%02x\n",
                        tmp & INTEL_GMCH_GMS_MASK);
                return -1;
        }
        *preallocated_size = stolen - overhead;

        return 0;
}

static int i915_load_modeset_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        unsigned long agp_size, prealloc_size;
        int fb_bar = IS_I9XX(dev) ? 2 : 0;
        int ret = 0;

        dev->devname = kstrdup(DRIVER_NAME, GFP_KERNEL);
        if (!dev->devname) {
                ret = -ENOMEM;
                goto out;
        }

        dev->mode_config.fb_base = drm_get_resource_start(dev, fb_bar) &
                0xff000000;

        if (IS_MOBILE(dev) || IS_I9XX(dev))
                dev_priv->cursor_needs_physical = true;
        else
                dev_priv->cursor_needs_physical = false;

        if (IS_I965G(dev) || IS_G33(dev))
                dev_priv->cursor_needs_physical = false;

        ret = i915_probe_agp(dev, &agp_size, &prealloc_size);
        if (ret)
                goto kfree_devname;

        /* Basic memrange allocator for stolen space (aka vram) */
        drm_mm_init(&dev_priv->vram, 0, prealloc_size);

        /* Let GEM Manage from end of prealloc space to end of aperture */
        i915_gem_do_init(dev, prealloc_size, agp_size);

        ret = i915_gem_init_ringbuffer(dev);
        if (ret)
                goto kfree_devname;

        /* Allow hardware batchbuffers unless told otherwise.
         */
        dev_priv->allow_batchbuffer = 1;

        ret = intel_init_bios(dev);
        if (ret)
                DRM_INFO("failed to find VBIOS tables\n");

        ret = drm_irq_install(dev);
        if (ret)
                goto destroy_ringbuffer;

        /* FIXME: re-add hotplug support */
#if 0
        ret = drm_hotplug_init(dev);
        if (ret)
                goto destroy_ringbuffer;
#endif

        /* Always safe in the mode setting case. */
        /* FIXME: do pre/post-mode set stuff in core KMS code */
        dev->vblank_disable_allowed = 1;

        /*
         * Initialize the hardware status page IRQ location.
         */

        I915_WRITE(INSTPM, (1 << 5) | (1 << 21));

        intel_modeset_init(dev);

        drm_helper_initial_config(dev, false);

        return 0;

destroy_ringbuffer:
        i915_gem_cleanup_ringbuffer(dev);
kfree_devname:
        kfree(dev->devname);
out:
        return ret;
}

int i915_master_create(struct drm_device *dev, struct drm_master *master)
{
        struct drm_i915_master_private *master_priv;

        master_priv = drm_calloc(1, sizeof(*master_priv), DRM_MEM_DRIVER);
        if (!master_priv)
                return -ENOMEM;

        master->driver_priv = master_priv;
        return 0;
}

void i915_master_destroy(struct drm_device *dev, struct drm_master *master)
{
        struct drm_i915_master_private *master_priv = master->driver_priv;

        if (!master_priv)
                return;

        drm_free(master_priv, sizeof(*master_priv), DRM_MEM_DRIVER);

        master->driver_priv = NULL;
}

/**
 * i915_driver_load - setup chip and create an initial config
 * @dev: DRM device
 * @flags: startup flags
 *
 * The driver load routine has to do several things:
 *   - drive output discovery via intel_modeset_init()
 *   - initialize the memory manager
 *   - allocate initial config memory
 *   - setup the DRM framebuffer with the allocated memory
 */
int i915_driver_load(struct drm_device *dev, unsigned long flags)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        unsigned long base, size;
        int ret = 0, mmio_bar = IS_I9XX(dev) ? 0 : 1;

        /* i915 has 4 more counters */
        dev->counters += 4;
        dev->types[6] = _DRM_STAT_IRQ;
        dev->types[7] = _DRM_STAT_PRIMARY;
        dev->types[8] = _DRM_STAT_SECONDARY;
        dev->types[9] = _DRM_STAT_DMA;

        dev_priv = drm_alloc(sizeof(drm_i915_private_t), DRM_MEM_DRIVER);
        if (dev_priv == NULL)
                return -ENOMEM;

        memset(dev_priv, 0, sizeof(drm_i915_private_t));

        dev->dev_private = (void *)dev_priv;
        dev_priv->dev = dev;

        /* Add register map (needed for suspend/resume) */
        base = drm_get_resource_start(dev, mmio_bar);
        size = drm_get_resource_len(dev, mmio_bar);

        dev_priv->regs = ioremap(base, size);
        if (!dev_priv->regs) {
                DRM_ERROR("failed to map registers\n");
                ret = -EIO;
                goto free_priv;
        }

        dev_priv->mm.gtt_mapping =
                io_mapping_create_wc(dev->agp->base,
                                     dev->agp->agp_info.aper_size * 1024*1024);
        /* Set up a WC MTRR for non-PAT systems.  This is more common than
         * one would think, because the kernel disables PAT on first
         * generation Core chips because WC PAT gets overridden by a UC
         * MTRR if present.  Even if a UC MTRR isn't present.
         */
        dev_priv->mm.gtt_mtrr = mtrr_add(dev->agp->base,
                                         dev->agp->agp_info.aper_size *
                                         1024 * 1024,
                                         MTRR_TYPE_WRCOMB, 1);
        if (dev_priv->mm.gtt_mtrr < 0) {
                DRM_INFO("MTRR allocation failed\n.  Graphics "
                         "performance may suffer.\n");
        }

#ifdef CONFIG_HIGHMEM64G
        /* don't enable GEM on PAE - needs agp + set_memory_* interface fixes */
        dev_priv->has_gem = 0;
#else
        /* enable GEM by default */
        dev_priv->has_gem = 1;
#endif

        i915_gem_load(dev);

        /* Init HWS */
        if (!I915_NEED_GFX_HWS(dev)) {
                ret = i915_init_phys_hws(dev);
                if (ret != 0)
                        goto out_rmmap;
        }

        /* On the 945G/GM, the chipset reports the MSI capability on the
         * integrated graphics even though the support isn't actually there
         * according to the published specs.  It doesn't appear to function
         * correctly in testing on 945G.
         * This may be a side effect of MSI having been made available for PEG
         * and the registers being closely associated.
         *
         * According to chipset errata, on the 965GM, MSI interrupts may
         * be lost or delayed, but we use them anyways to avoid
         * stuck interrupts on some machines.
         */
        if (!IS_I945G(dev) && !IS_I945GM(dev))
                pci_enable_msi(dev->pdev);

        intel_opregion_init(dev);

        spin_lock_init(&dev_priv->user_irq_lock);
        dev_priv->user_irq_refcount = 0;

        ret = drm_vblank_init(dev, I915_NUM_PIPE);

        if (ret) {
                (void) i915_driver_unload(dev);
                return ret;
        }

        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                ret = i915_load_modeset_init(dev);
                if (ret < 0) {
                        DRM_ERROR("failed to init modeset\n");
                        goto out_rmmap;
                }
        }

        return 0;

out_rmmap:
        iounmap(dev_priv->regs);
free_priv:
        drm_free(dev_priv, sizeof(struct drm_i915_private), DRM_MEM_DRIVER);
        return ret;
}

int i915_driver_unload(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        io_mapping_free(dev_priv->mm.gtt_mapping);
        if (dev_priv->mm.gtt_mtrr >= 0) {
                mtrr_del(dev_priv->mm.gtt_mtrr, dev->agp->base,
                         dev->agp->agp_info.aper_size * 1024 * 1024);
                dev_priv->mm.gtt_mtrr = -1;
        }

        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                drm_irq_uninstall(dev);
        }

        if (dev->pdev->msi_enabled)
                pci_disable_msi(dev->pdev);

        if (dev_priv->regs != NULL)
                iounmap(dev_priv->regs);

        intel_opregion_free(dev);

        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                intel_modeset_cleanup(dev);

                i915_gem_free_all_phys_object(dev);

                mutex_lock(&dev->struct_mutex);
                i915_gem_cleanup_ringbuffer(dev);
                mutex_unlock(&dev->struct_mutex);
                drm_mm_takedown(&dev_priv->vram);
                i915_gem_lastclose(dev);
        }

        drm_free(dev->dev_private, sizeof(drm_i915_private_t),
                 DRM_MEM_DRIVER);

        return 0;
}

int i915_driver_open(struct drm_device *dev, struct drm_file *file_priv)
{
        struct drm_i915_file_private *i915_file_priv;

        DRM_DEBUG("\n");
        i915_file_priv = (struct drm_i915_file_private *)
            drm_alloc(sizeof(*i915_file_priv), DRM_MEM_FILES);

        if (!i915_file_priv)
                return -ENOMEM;

        file_priv->driver_priv = i915_file_priv;

        i915_file_priv->mm.last_gem_seqno = 0;
        i915_file_priv->mm.last_gem_throttle_seqno = 0;

        return 0;
}

/**
 * i915_driver_lastclose - clean up after all DRM clients have exited
 * @dev: DRM device
 *
 * Take care of cleaning up after all DRM clients have exited.  In the
 * mode setting case, we want to restore the kernel's initial mode (just
 * in case the last client left us in a bad state).
 *
 * Additionally, in the non-mode setting case, we'll tear down the AGP
 * and DMA structures, since the kernel won't be using them, and clea
 * up any GEM state.
 */
void i915_driver_lastclose(struct drm_device * dev)
{
        drm_i915_private_t *dev_priv = dev->dev_private;

        if (!dev_priv || drm_core_check_feature(dev, DRIVER_MODESET)) {
                intelfb_restore();
                return;
        }

        i915_gem_lastclose(dev);

        if (dev_priv->agp_heap)
                i915_mem_takedown(&(dev_priv->agp_heap));

        i915_dma_cleanup(dev);
}

void i915_driver_preclose(struct drm_device * dev, struct drm_file *file_priv)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                i915_mem_release(dev, file_priv, dev_priv->agp_heap);
}

void i915_driver_postclose(struct drm_device *dev, struct drm_file *file_priv)
{
        struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;

        drm_free(i915_file_priv, sizeof(*i915_file_priv), DRM_MEM_FILES);
}

struct drm_ioctl_desc i915_ioctls[] = {
        DRM_IOCTL_DEF(DRM_I915_INIT, i915_dma_init, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_FLUSH, i915_flush_ioctl, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_FLIP, i915_flip_bufs, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_BATCHBUFFER, i915_batchbuffer, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_IRQ_EMIT, i915_irq_emit, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_IRQ_WAIT, i915_irq_wait, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_GETPARAM, i915_getparam, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_SETPARAM, i915_setparam, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_ALLOC, i915_mem_alloc, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_FREE, i915_mem_free, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_INIT_HEAP, i915_mem_init_heap, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_CMDBUFFER, i915_cmdbuffer, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_DESTROY_HEAP,  i915_mem_destroy_heap, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY ),
        DRM_IOCTL_DEF(DRM_I915_SET_VBLANK_PIPE,  i915_vblank_pipe_set, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY ),
        DRM_IOCTL_DEF(DRM_I915_GET_VBLANK_PIPE,  i915_vblank_pipe_get, DRM_AUTH ),
        DRM_IOCTL_DEF(DRM_I915_VBLANK_SWAP, i915_vblank_swap, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_HWS_ADDR, i915_set_status_page, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_GEM_INIT, i915_gem_init_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_GEM_EXECBUFFER, i915_gem_execbuffer, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_GEM_PIN, i915_gem_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_GEM_UNPIN, i915_gem_unpin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_GEM_THROTTLE, i915_gem_throttle_ioctl, DRM_AUTH),
        DRM_IOCTL_DEF(DRM_I915_GEM_ENTERVT, i915_gem_entervt_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_GEM_LEAVEVT, i915_gem_leavevt_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
        DRM_IOCTL_DEF(DRM_I915_GEM_CREATE, i915_gem_create_ioctl, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_PREAD, i915_gem_pread_ioctl, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_PWRITE, i915_gem_pwrite_ioctl, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_MMAP, i915_gem_mmap_ioctl, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_MMAP_GTT, i915_gem_mmap_gtt_ioctl, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_SET_DOMAIN, i915_gem_set_domain_ioctl, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_SW_FINISH, i915_gem_sw_finish_ioctl, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_SET_TILING, i915_gem_set_tiling, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_GET_TILING, i915_gem_get_tiling, 0),
        DRM_IOCTL_DEF(DRM_I915_GEM_GET_APERTURE, i915_gem_get_aperture_ioctl, 0),
};

int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);

/**
 * Determine if the device really is AGP or not.
 *
 * All Intel graphics chipsets are treated as AGP, even if they are really
 * PCI-e.
 *
 * \param dev   The device to be tested.
 *
 * \returns
 * A value of 1 is always retured to indictate every i9x5 is AGP.
 */
int i915_driver_device_is_agp(struct drm_device * dev)
{
        return 1;
}