i915_dma.c

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/* 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.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_trace.h"
#include <linux/pci.h>
#include <linux/vgaarb.h>
#include <linux/acpi.h>
#include <linux/pnp.h>
#include <linux/vga_switcheroo.h>
#include <linux/slab.h>
#include <acpi/video.h>
#include <asm/pat.h>

#define LP_RING(d) (&((struct drm_i915_private *)(d))->ring[RCS])

#define BEGIN_LP_RING(n) \
    intel_ring_begin(LP_RING(dev_priv), (n))

#define OUT_RING(x) \
    intel_ring_emit(LP_RING(dev_priv), x)

#define ADVANCE_LP_RING() \
    intel_ring_advance(LP_RING(dev_priv))

#define RING_LOCK_TEST_WITH_RETURN(dev, file) do {          \
    if (LP_RING(dev->dev_private)->obj == NULL)         \
        LOCK_TEST_WITH_RETURN(dev, file);           \
} while (0)

static inline u32
intel_read_legacy_status_page(struct drm_i915_private *dev_priv, int reg)
{
    if (I915_NEED_GFX_HWS(dev_priv->dev))
        return ioread32(dev_priv->dri1.gfx_hws_cpu_addr + reg);
    else
        return intel_read_status_page(LP_RING(dev_priv), reg);
}

#define READ_HWSP(dev_priv, reg) intel_read_legacy_status_page(dev_priv, reg)
#define READ_BREADCRUMB(dev_priv) READ_HWSP(dev_priv, I915_BREADCRUMB_INDEX)
#define I915_BREADCRUMB_INDEX       0x21

void i915_update_dri1_breadcrumb(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    struct drm_i915_master_private *master_priv;

    if (dev->primary->master) {
        master_priv = dev->primary->master->driver_priv;
        if (master_priv->sarea_priv)
            master_priv->sarea_priv->last_dispatch =
                READ_BREADCRUMB(dev_priv);
    }
}

static void i915_write_hws_pga(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    u32 addr;

    addr = dev_priv->status_page_dmah->busaddr;
    if (INTEL_INFO(dev)->gen >= 4)
        addr |= (dev_priv->status_page_dmah->busaddr >> 28) & 0xf0;
    I915_WRITE(HWS_PGA, addr);
}

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);

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

    memset_io((void __force __iomem *)dev_priv->status_page_dmah->vaddr,
          0, PAGE_SIZE);

    i915_write_hws_pga(dev);

    DRM_DEBUG_DRIVER("Enabled hardware status page\n");
    return 0;
}

static void i915_free_hws(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    struct intel_ring_buffer *ring = LP_RING(dev_priv);

    if (dev_priv->status_page_dmah) {
        drm_pci_free(dev, dev_priv->status_page_dmah);
        dev_priv->status_page_dmah = NULL;
    }

    if (ring->status_page.gfx_addr) {
        ring->status_page.gfx_addr = 0;
        iounmap(dev_priv->dri1.gfx_hws_cpu_addr);
    }

    /* 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;
    struct intel_ring_buffer *ring = LP_RING(dev_priv);

    /*
     * 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_HEAD(ring) & HEAD_ADDR;
    ring->tail = I915_READ_TAIL(ring) & 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;
    int i;

    /* 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);

    mutex_lock(&dev->struct_mutex);
    for (i = 0; i < I915_NUM_RINGS; i++)
        intel_cleanup_ring_buffer(&dev_priv->ring[i]);
    mutex_unlock(&dev->struct_mutex);

    /* 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;
    int ret;

    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_DRIVER("sarea not found assuming DRI2 userspace\n");
    }

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

        ret = intel_render_ring_init_dri(dev,
                         init->ring_start,
                         init->ring_size);
        if (ret) {
            i915_dma_cleanup(dev);
            return ret;
        }
    }

    dev_priv->dri1.cpp = init->cpp;
    dev_priv->dri1.back_offset = init->back_offset;
    dev_priv->dri1.front_offset = init->front_offset;
    dev_priv->dri1.current_page = 0;
    if (master_priv->sarea_priv)
        master_priv->sarea_priv->pf_current_page = 0;

    /* Allow hardware batchbuffers unless told otherwise.
     */
    dev_priv->dri1.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;
    struct intel_ring_buffer *ring = LP_RING(dev_priv);

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

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

    /* Program Hardware Status Page */
    if (!ring->status_page.page_addr) {
        DRM_ERROR("Can not find hardware status page\n");
        return -EINVAL;
    }
    DRM_DEBUG_DRIVER("hw status page @ %p\n",
                ring->status_page.page_addr);
    if (ring->status_page.gfx_addr != 0)
        intel_ring_setup_status_page(ring);
    else
        i915_write_hws_pga(dev);

    DRM_DEBUG_DRIVER("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;

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

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

    if ((dwords+1) * sizeof(int) >= LP_RING(dev_priv)->size - 8)
        return -EINVAL;

    for (i = 0; i < dwords;) {
        int sz = validate_cmd(buffer[i]);
        if (sz == 0 || i + sz > dwords)
            return -EINVAL;
        i += sz;
    }

    ret = BEGIN_LP_RING((dwords+1)&~1);
    if (ret)
        return ret;

    for (i = 0; i < dwords; i++)
        OUT_RING(buffer[i]);
    if (dwords & 1)
        OUT_RING(0);

    ADVANCE_LP_RING();

    return 0;
}

int
i915_emit_box(struct drm_device *dev,
          struct drm_clip_rect *box,
          int DR1, int DR4)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    int ret;

    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 (INTEL_INFO(dev)->gen >= 4) {
        ret = BEGIN_LP_RING(4);
        if (ret)
            return ret;

        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);
    } else {
        ret = BEGIN_LP_RING(6);
        if (ret)
            return ret;

        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;

    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;

    if (BEGIN_LP_RING(4) == 0) {
        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,
                   struct drm_clip_rect *cliprects,
                   void *cmdbuf)
{
    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, &cliprects[i],
                        cmd->DR1, cmd->DR4);
            if (ret)
                return ret;
        }

        ret = i915_emit_cmds(dev, cmdbuf, 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,
                     struct drm_clip_rect *cliprects)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    int nbox = batch->num_cliprects;
    int i, count, ret;

    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) {
            ret = i915_emit_box(dev, &cliprects[i],
                        batch->DR1, batch->DR4);
            if (ret)
                return ret;
        }

        if (!IS_I830(dev) && !IS_845G(dev)) {
            ret = BEGIN_LP_RING(2);
            if (ret)
                return ret;

            if (INTEL_INFO(dev)->gen >= 4) {
                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);
            }
        } else {
            ret = BEGIN_LP_RING(4);
            if (ret)
                return ret;

            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();
    }


    if (IS_G4X(dev) || IS_GEN5(dev)) {
        if (BEGIN_LP_RING(2) == 0) {
            OUT_RING(MI_FLUSH | MI_NO_WRITE_FLUSH | MI_INVALIDATE_ISP);
            OUT_RING(MI_NOOP);
            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;
    int ret;

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

    DRM_DEBUG_DRIVER("%s: page=%d pfCurrentPage=%d\n",
              __func__,
             dev_priv->dri1.current_page,
             master_priv->sarea_priv->pf_current_page);

    i915_kernel_lost_context(dev);

    ret = BEGIN_LP_RING(10);
    if (ret)
        return ret;

    OUT_RING(MI_FLUSH | MI_READ_FLUSH);
    OUT_RING(0);

    OUT_RING(CMD_OP_DISPLAYBUFFER_INFO | ASYNC_FLIP);
    OUT_RING(0);
    if (dev_priv->dri1.current_page == 0) {
        OUT_RING(dev_priv->dri1.back_offset);
        dev_priv->dri1.current_page = 1;
    } else {
        OUT_RING(dev_priv->dri1.front_offset);
        dev_priv->dri1.current_page = 0;
    }
    OUT_RING(0);

    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++;

    if (BEGIN_LP_RING(4) == 0) {
        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->dri1.current_page;
    return 0;
}

static int i915_quiescent(struct drm_device *dev)
{
    struct intel_ring_buffer *ring = LP_RING(dev->dev_private);

    i915_kernel_lost_context(dev);
    return intel_wait_ring_idle(ring);
}

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

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

    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;
    struct drm_clip_rect *cliprects = NULL;

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

    if (!dev_priv->dri1.allow_batchbuffer) {
        DRM_ERROR("Batchbuffer ioctl disabled\n");
        return -EINVAL;
    }

    DRM_DEBUG_DRIVER("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 < 0)
        return -EINVAL;

    if (batch->num_cliprects) {
        cliprects = kcalloc(batch->num_cliprects,
                    sizeof(struct drm_clip_rect),
                    GFP_KERNEL);
        if (cliprects == NULL)
            return -ENOMEM;

        ret = copy_from_user(cliprects, batch->cliprects,
                     batch->num_cliprects *
                     sizeof(struct drm_clip_rect));
        if (ret != 0) {
            ret = -EFAULT;
            goto fail_free;
        }
    }

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

    if (sarea_priv)
        sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);

fail_free:
    kfree(cliprects);

    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;
    struct drm_clip_rect *cliprects = NULL;
    void *batch_data;
    int ret;

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

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

    RING_LOCK_TEST_WITH_RETURN(dev, file_priv);

    if (cmdbuf->num_cliprects < 0)
        return -EINVAL;

    batch_data = kmalloc(cmdbuf->sz, GFP_KERNEL);
    if (batch_data == NULL)
        return -ENOMEM;

    ret = copy_from_user(batch_data, cmdbuf->buf, cmdbuf->sz);
    if (ret != 0) {
        ret = -EFAULT;
        goto fail_batch_free;
    }

    if (cmdbuf->num_cliprects) {
        cliprects = kcalloc(cmdbuf->num_cliprects,
                    sizeof(struct drm_clip_rect), GFP_KERNEL);
        if (cliprects == NULL) {
            ret = -ENOMEM;
            goto fail_batch_free;
        }

        ret = copy_from_user(cliprects, cmdbuf->cliprects,
                     cmdbuf->num_cliprects *
                     sizeof(struct drm_clip_rect));
        if (ret != 0) {
            ret = -EFAULT;
            goto fail_clip_free;
        }
    }

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

    if (sarea_priv)
        sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);

fail_clip_free:
    kfree(cliprects);
fail_batch_free:
    kfree(batch_data);

    return ret;
}

static int i915_emit_irq(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;

    i915_kernel_lost_context(dev);

    DRM_DEBUG_DRIVER("\n");

    dev_priv->counter++;
    if (dev_priv->counter > 0x7FFFFFFFUL)
        dev_priv->counter = 1;
    if (master_priv->sarea_priv)
        master_priv->sarea_priv->last_enqueue = dev_priv->counter;

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

    return dev_priv->counter;
}

static int i915_wait_irq(struct drm_device * dev, int irq_nr)
{
    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;
    int ret = 0;
    struct intel_ring_buffer *ring = LP_RING(dev_priv);

    DRM_DEBUG_DRIVER("irq_nr=%d breadcrumb=%d\n", irq_nr,
          READ_BREADCRUMB(dev_priv));

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

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

    if (ring->irq_get(ring)) {
        DRM_WAIT_ON(ret, ring->irq_queue, 3 * DRM_HZ,
                READ_BREADCRUMB(dev_priv) >= irq_nr);
        ring->irq_put(ring);
    } else if (wait_for(READ_BREADCRUMB(dev_priv) >= irq_nr, 3000))
        ret = -EBUSY;

    if (ret == -EBUSY) {
        DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
              READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
    }

    return ret;
}

/* Needs the lock as it touches the ring.
 */
static int i915_irq_emit(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    drm_i915_irq_emit_t *emit = data;
    int result;

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

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

    RING_LOCK_TEST_WITH_RETURN(dev, file_priv);

    mutex_lock(&dev->struct_mutex);
    result = i915_emit_irq(dev);
    mutex_unlock(&dev->struct_mutex);

    if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
        DRM_ERROR("copy_to_user\n");
        return -EFAULT;
    }

    return 0;
}

/* Doesn't need the hardware lock.
 */
static int i915_irq_wait(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    drm_i915_irq_wait_t *irqwait = data;

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

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

    return i915_wait_irq(dev, irqwait->irq_seq);
}

static int i915_vblank_pipe_get(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    drm_i915_vblank_pipe_t *pipe = data;

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

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

    pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;

    return 0;
}

static int i915_vblank_swap(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
    /* The delayed swap mechanism was fundamentally racy, and has been
     * removed.  The model was that the client requested a delayed flip/swap
     * from the kernel, then waited for vblank before continuing to perform
     * rendering.  The problem was that the kernel might wake the client
     * up before it dispatched the vblank swap (since the lock has to be
     * held while touching the ringbuffer), in which case the client would
     * clear and start the next frame before the swap occurred, and
     * flicker would occur in addition to likely missing the vblank.
     *
     * In the absence of this ioctl, userland falls back to a correct path
     * of waiting for a vblank, then dispatching the swap on its own.
     * Context switching to userland and back is plenty fast enough for
     * meeting the requirements of vblank swapping.
     */
    return -EINVAL;
}

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

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

    DRM_DEBUG_DRIVER("%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->dri1.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 = 1;
        break;
    case I915_PARAM_NUM_FENCES_AVAIL:
        value = dev_priv->num_fence_regs - dev_priv->fence_reg_start;
        break;
    case I915_PARAM_HAS_OVERLAY:
        value = dev_priv->overlay ? 1 : 0;
        break;
    case I915_PARAM_HAS_PAGEFLIPPING:
        value = 1;
        break;
    case I915_PARAM_HAS_EXECBUF2:
        /* depends on GEM */
        value = 1;
        break;
    case I915_PARAM_HAS_BSD:
        value = intel_ring_initialized(&dev_priv->ring[VCS]);
        break;
    case I915_PARAM_HAS_BLT:
        value = intel_ring_initialized(&dev_priv->ring[BCS]);
        break;
    case I915_PARAM_HAS_RELAXED_FENCING:
        value = 1;
        break;
    case I915_PARAM_HAS_COHERENT_RINGS:
        value = 1;
        break;
    case I915_PARAM_HAS_EXEC_CONSTANTS:
        value = INTEL_INFO(dev)->gen >= 4;
        break;
    case I915_PARAM_HAS_RELAXED_DELTA:
        value = 1;
        break;
    case I915_PARAM_HAS_GEN7_SOL_RESET:
        value = 1;
        break;
    case I915_PARAM_HAS_LLC:
        value = HAS_LLC(dev);
        break;
    case I915_PARAM_HAS_ALIASING_PPGTT:
        value = dev_priv->mm.aliasing_ppgtt ? 1 : 0;
        break;
    case I915_PARAM_HAS_WAIT_TIMEOUT:
        value = 1;
        break;
    case I915_PARAM_HAS_SEMAPHORES:
        value = i915_semaphore_is_enabled(dev);
        break;
    case I915_PARAM_HAS_PRIME_VMAP_FLUSH:
        value = 1;
        break;
    default:
        DRM_DEBUG_DRIVER("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:
        break;
    case I915_SETPARAM_ALLOW_BATCHBUFFER:
        dev_priv->dri1.allow_batchbuffer = param->value ? 1 : 0;
        break;
    case I915_SETPARAM_NUM_USED_FENCES:
        if (param->value > dev_priv->num_fence_regs ||
            param->value < 0)
            return -EINVAL;
        /* Userspace can use first N regs */
        dev_priv->fence_reg_start = param->value;
        break;
    default:
        DRM_DEBUG_DRIVER("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;
    struct intel_ring_buffer *ring = LP_RING(dev_priv);

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

    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;
    }

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

    ring->status_page.gfx_addr = hws->addr & (0x1ffff<<12);

    dev_priv->dri1.gfx_hws_cpu_addr =
        ioremap_wc(dev_priv->mm.gtt_base_addr + hws->addr, 4096);
    if (dev_priv->dri1.gfx_hws_cpu_addr == NULL) {
        i915_dma_cleanup(dev);
        ring->status_page.gfx_addr = 0;
        DRM_ERROR("can not ioremap virtual address for"
                " G33 hw status page\n");
        return -ENOMEM;
    }

    memset_io(dev_priv->dri1.gfx_hws_cpu_addr, 0, PAGE_SIZE);
    I915_WRITE(HWS_PGA, ring->status_page.gfx_addr);

    DRM_DEBUG_DRIVER("load hws HWS_PGA with gfx mem 0x%x\n",
             ring->status_page.gfx_addr);
    DRM_DEBUG_DRIVER("load hws at %p\n",
             ring->status_page.page_addr);
    return 0;
}

static int i915_get_bridge_dev(struct drm_device *dev)
{
    struct drm_i915_private *dev_priv = dev->dev_private;

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

#define MCHBAR_I915 0x44
#define MCHBAR_I965 0x48
#define MCHBAR_SIZE (4*4096)

#define DEVEN_REG 0x54
#define   DEVEN_MCHBAR_EN (1 << 28)

/* Allocate space for the MCH regs if needed, return nonzero on error */
static int
intel_alloc_mchbar_resource(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    int reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;
    u32 temp_lo, temp_hi = 0;
    u64 mchbar_addr;
    int ret;

    if (INTEL_INFO(dev)->gen >= 4)
        pci_read_config_dword(dev_priv->bridge_dev, reg + 4, &temp_hi);
    pci_read_config_dword(dev_priv->bridge_dev, reg, &temp_lo);
    mchbar_addr = ((u64)temp_hi << 32) | temp_lo;

    /* If ACPI doesn't have it, assume we need to allocate it ourselves */
#ifdef CONFIG_PNP
    if (mchbar_addr &&
        pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE))
        return 0;
#endif

    /* Get some space for it */
    dev_priv->mch_res.name = "i915 MCHBAR";
    dev_priv->mch_res.flags = IORESOURCE_MEM;
    ret = pci_bus_alloc_resource(dev_priv->bridge_dev->bus,
                     &dev_priv->mch_res,
                     MCHBAR_SIZE, MCHBAR_SIZE,
                     PCIBIOS_MIN_MEM,
                     0, pcibios_align_resource,
                     dev_priv->bridge_dev);
    if (ret) {
        DRM_DEBUG_DRIVER("failed bus alloc: %d\n", ret);
        dev_priv->mch_res.start = 0;
        return ret;
    }

    if (INTEL_INFO(dev)->gen >= 4)
        pci_write_config_dword(dev_priv->bridge_dev, reg + 4,
                       upper_32_bits(dev_priv->mch_res.start));

    pci_write_config_dword(dev_priv->bridge_dev, reg,
                   lower_32_bits(dev_priv->mch_res.start));
    return 0;
}

/* Setup MCHBAR if possible, return true if we should disable it again */
static void
intel_setup_mchbar(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    int mchbar_reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;
    u32 temp;
    bool enabled;

    dev_priv->mchbar_need_disable = false;

    if (IS_I915G(dev) || IS_I915GM(dev)) {
        pci_read_config_dword(dev_priv->bridge_dev, DEVEN_REG, &temp);
        enabled = !!(temp & DEVEN_MCHBAR_EN);
    } else {
        pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
        enabled = temp & 1;
    }

    /* If it's already enabled, don't have to do anything */
    if (enabled)
        return;

    if (intel_alloc_mchbar_resource(dev))
        return;

    dev_priv->mchbar_need_disable = true;

    /* Space is allocated or reserved, so enable it. */
    if (IS_I915G(dev) || IS_I915GM(dev)) {
        pci_write_config_dword(dev_priv->bridge_dev, DEVEN_REG,
                       temp | DEVEN_MCHBAR_EN);
    } else {
        pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
        pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg, temp | 1);
    }
}

static void
intel_teardown_mchbar(struct drm_device *dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;
    int mchbar_reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;
    u32 temp;

    if (dev_priv->mchbar_need_disable) {
        if (IS_I915G(dev) || IS_I915GM(dev)) {
            pci_read_config_dword(dev_priv->bridge_dev, DEVEN_REG, &temp);
            temp &= ~DEVEN_MCHBAR_EN;
            pci_write_config_dword(dev_priv->bridge_dev, DEVEN_REG, temp);
        } else {
            pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp);
            temp &= ~1;
            pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg, temp);
        }
    }

    if (dev_priv->mch_res.start)
        release_resource(&dev_priv->mch_res);
}

/* true = enable decode, false = disable decoder */
static unsigned int i915_vga_set_decode(void *cookie, bool state)
{
    struct drm_device *dev = cookie;

    intel_modeset_vga_set_state(dev, state);
    if (state)
        return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
               VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
    else
        return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
}

static void i915_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
{
    struct drm_device *dev = pci_get_drvdata(pdev);
    pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
    if (state == VGA_SWITCHEROO_ON) {
        pr_info("switched on\n");
        dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
        /* i915 resume handler doesn't set to D0 */
        pci_set_power_state(dev->pdev, PCI_D0);
        i915_resume(dev);
        dev->switch_power_state = DRM_SWITCH_POWER_ON;
    } else {
        pr_err("switched off\n");
        dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
        i915_suspend(dev, pmm);
        dev->switch_power_state = DRM_SWITCH_POWER_OFF;
    }
}

static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
{
    struct drm_device *dev = pci_get_drvdata(pdev);
    bool can_switch;

    spin_lock(&dev->count_lock);
    can_switch = (dev->open_count == 0);
    spin_unlock(&dev->count_lock);
    return can_switch;
}

static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
    .set_gpu_state = i915_switcheroo_set_state,
    .reprobe = NULL,
    .can_switch = i915_switcheroo_can_switch,
};

static int i915_load_modeset_init(struct drm_device *dev)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    int ret;

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

    /* If we have > 1 VGA cards, then we need to arbitrate access
     * to the common VGA resources.
     *
     * If we are a secondary display controller (!PCI_DISPLAY_CLASS_VGA),
     * then we do not take part in VGA arbitration and the
     * vga_client_register() fails with -ENODEV.
     */
    ret = vga_client_register(dev->pdev, dev, NULL, i915_vga_set_decode);
    if (ret && ret != -ENODEV)
        goto out;

    intel_register_dsm_handler();

    ret = vga_switcheroo_register_client(dev->pdev, &i915_switcheroo_ops);
    if (ret)
        goto cleanup_vga_client;

    /* Initialise stolen first so that we may reserve preallocated
     * objects for the BIOS to KMS transition.
     */
    ret = i915_gem_init_stolen(dev);
    if (ret)
        goto cleanup_vga_switcheroo;

    intel_modeset_init(dev);

    ret = i915_gem_init(dev);
    if (ret)
        goto cleanup_gem_stolen;

    intel_modeset_gem_init(dev);

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

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

    ret = intel_fbdev_init(dev);
    if (ret)
        goto cleanup_irq;

    drm_kms_helper_poll_init(dev);

    /* We're off and running w/KMS */
    dev_priv->mm.suspended = 0;

    return 0;

cleanup_irq:
    drm_irq_uninstall(dev);
cleanup_gem:
    mutex_lock(&dev->struct_mutex);
    i915_gem_cleanup_ringbuffer(dev);
    mutex_unlock(&dev->struct_mutex);
    i915_gem_cleanup_aliasing_ppgtt(dev);
cleanup_gem_stolen:
    i915_gem_cleanup_stolen(dev);
cleanup_vga_switcheroo:
    vga_switcheroo_unregister_client(dev->pdev);
cleanup_vga_client:
    vga_client_register(dev->pdev, NULL, NULL, NULL);
out:
    return ret;
}

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

    master_priv = kzalloc(sizeof(*master_priv), GFP_KERNEL);
    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;

    kfree(master_priv);

    master->driver_priv = NULL;
}

static void
i915_mtrr_setup(struct drm_i915_private *dev_priv, unsigned long base,
        unsigned long size)
{
    dev_priv->mm.gtt_mtrr = -1;

#if defined(CONFIG_X86_PAT)
    if (cpu_has_pat)
        return;
#endif

    /* 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(base, size, MTRR_TYPE_WRCOMB, 1);
    if (dev_priv->mm.gtt_mtrr < 0) {
        DRM_INFO("MTRR allocation failed.  Graphics "
             "performance may suffer.\n");
    }
}

static void i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
{
    struct apertures_struct *ap;
    struct pci_dev *pdev = dev_priv->dev->pdev;
    bool primary;

    ap = alloc_apertures(1);
    if (!ap)
        return;

    ap->ranges[0].base = dev_priv->mm.gtt->gma_bus_addr;
    ap->ranges[0].size =
        dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
    primary =
        pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;

    remove_conflicting_framebuffers(ap, "inteldrmfb", primary);

    kfree(ap);
}

static void i915_dump_device_info(struct drm_i915_private *dev_priv)
{
    const struct intel_device_info *info = dev_priv->info;

#define DEV_INFO_FLAG(name) info->name ? #name "," : ""
#define DEV_INFO_SEP ,
    DRM_DEBUG_DRIVER("i915 device info: gen=%i, pciid=0x%04x flags="
             "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
             info->gen,
             dev_priv->dev->pdev->device,
             DEV_INFO_FLAGS);
#undef DEV_INFO_FLAG
#undef DEV_INFO_SEP
}

int i915_driver_load(struct drm_device *dev, unsigned long flags)
{
    struct drm_i915_private *dev_priv;
    struct intel_device_info *info;
    int ret = 0, mmio_bar, mmio_size;
    uint32_t aperture_size;

    info = (struct intel_device_info *) flags;

    /* Refuse to load on gen6+ without kms enabled. */
    if (info->gen >= 6 && !drm_core_check_feature(dev, DRIVER_MODESET))
        return -ENODEV;

    /* 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 = kzalloc(sizeof(drm_i915_private_t), GFP_KERNEL);
    if (dev_priv == NULL)
        return -ENOMEM;

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

    i915_dump_device_info(dev_priv);

    if (i915_get_bridge_dev(dev)) {
        ret = -EIO;
        goto free_priv;
    }

    ret = intel_gmch_probe(dev_priv->bridge_dev, dev->pdev, NULL);
    if (!ret) {
        DRM_ERROR("failed to set up gmch\n");
        ret = -EIO;
        goto put_bridge;
    }

    dev_priv->mm.gtt = intel_gtt_get();
    if (!dev_priv->mm.gtt) {
        DRM_ERROR("Failed to initialize GTT\n");
        ret = -ENODEV;
        goto put_gmch;
    }

    if (drm_core_check_feature(dev, DRIVER_MODESET))
        i915_kick_out_firmware_fb(dev_priv);

    pci_set_master(dev->pdev);

    /* overlay on gen2 is broken and can't address above 1G */
    if (IS_GEN2(dev))
        dma_set_coherent_mask(&dev->pdev->dev, DMA_BIT_MASK(30));

    /* 965GM sometimes incorrectly writes to hardware status page (HWS)
     * using 32bit addressing, overwriting memory if HWS is located
     * above 4GB.
     *
     * The documentation also mentions an issue with undefined
     * behaviour if any general state is accessed within a page above 4GB,
     * which also needs to be handled carefully.
     */
    if (IS_BROADWATER(dev) || IS_CRESTLINE(dev))
        dma_set_coherent_mask(&dev->pdev->dev, DMA_BIT_MASK(32));

    mmio_bar = IS_GEN2(dev) ? 1 : 0;
    /* Before gen4, the registers and the GTT are behind different BARs.
     * However, from gen4 onwards, the registers and the GTT are shared
     * in the same BAR, so we want to restrict this ioremap from
     * clobbering the GTT which we want ioremap_wc instead. Fortunately,
     * the register BAR remains the same size for all the earlier
     * generations up to Ironlake.
     */
    if (info->gen < 5)
        mmio_size = 512*1024;
    else
        mmio_size = 2*1024*1024;

    dev_priv->regs = pci_iomap(dev->pdev, mmio_bar, mmio_size);
    if (!dev_priv->regs) {
        DRM_ERROR("failed to map registers\n");
        ret = -EIO;
        goto put_gmch;
    }

    aperture_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
    dev_priv->mm.gtt_base_addr = dev_priv->mm.gtt->gma_bus_addr;

    dev_priv->mm.gtt_mapping =
        io_mapping_create_wc(dev_priv->mm.gtt_base_addr,
                     aperture_size);
    if (dev_priv->mm.gtt_mapping == NULL) {
        ret = -EIO;
        goto out_rmmap;
    }

    i915_mtrr_setup(dev_priv, dev_priv->mm.gtt_base_addr,
            aperture_size);

    /* The i915 workqueue is primarily used for batched retirement of
     * requests (and thus managing bo) once the task has been completed
     * by the GPU. i915_gem_retire_requests() is called directly when we
     * need high-priority retirement, such as waiting for an explicit
     * bo.
     *
     * It is also used for periodic low-priority events, such as
     * idle-timers and recording error state.
     *
     * All tasks on the workqueue are expected to acquire the dev mutex
     * so there is no point in running more than one instance of the
     * workqueue at any time.  Use an ordered one.
     */
    dev_priv->wq = alloc_ordered_workqueue("i915", 0);
    if (dev_priv->wq == NULL) {
        DRM_ERROR("Failed to create our workqueue.\n");
        ret = -ENOMEM;
        goto out_mtrrfree;
    }

    /* This must be called before any calls to HAS_PCH_* */
    intel_detect_pch(dev);

    intel_irq_init(dev);
    intel_gt_init(dev);

    /* Try to make sure MCHBAR is enabled before poking at it */
    intel_setup_mchbar(dev);
    intel_setup_gmbus(dev);
    intel_opregion_setup(dev);

    /* Make sure the bios did its job and set up vital registers */
    intel_setup_bios(dev);

    i915_gem_load(dev);

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

    /* 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);

    spin_lock_init(&dev_priv->irq_lock);
    spin_lock_init(&dev_priv->error_lock);
    spin_lock_init(&dev_priv->rps.lock);
    spin_lock_init(&dev_priv->dpio_lock);

    if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
        dev_priv->num_pipe = 3;
    else if (IS_MOBILE(dev) || !IS_GEN2(dev))
        dev_priv->num_pipe = 2;
    else
        dev_priv->num_pipe = 1;

    ret = drm_vblank_init(dev, dev_priv->num_pipe);
    if (ret)
        goto out_gem_unload;

    /* Start out suspended */
    dev_priv->mm.suspended = 1;

    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_gem_unload;
        }
    }

    i915_setup_sysfs(dev);

    /* Must be done after probing outputs */
    intel_opregion_init(dev);
    acpi_video_register();

    setup_timer(&dev_priv->hangcheck_timer, i915_hangcheck_elapsed,
            (unsigned long) dev);

    if (IS_GEN5(dev))
        intel_gpu_ips_init(dev_priv);

    return 0;

out_gem_unload:
    if (dev_priv->mm.inactive_shrinker.shrink)
        unregister_shrinker(&dev_priv->mm.inactive_shrinker);

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

    intel_teardown_gmbus(dev);
    intel_teardown_mchbar(dev);
    destroy_workqueue(dev_priv->wq);
out_mtrrfree:
    if (dev_priv->mm.gtt_mtrr >= 0) {
        mtrr_del(dev_priv->mm.gtt_mtrr,
             dev_priv->mm.gtt_base_addr,
             aperture_size);
        dev_priv->mm.gtt_mtrr = -1;
    }
    io_mapping_free(dev_priv->mm.gtt_mapping);
out_rmmap:
    pci_iounmap(dev->pdev, dev_priv->regs);
put_gmch:
    intel_gmch_remove();
put_bridge:
    pci_dev_put(dev_priv->bridge_dev);
free_priv:
    kfree(dev_priv);
    return ret;
}

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

    intel_gpu_ips_teardown();

    i915_teardown_sysfs(dev);

    if (dev_priv->mm.inactive_shrinker.shrink)
        unregister_shrinker(&dev_priv->mm.inactive_shrinker);

    mutex_lock(&dev->struct_mutex);
    ret = i915_gpu_idle(dev);
    if (ret)
        DRM_ERROR("failed to idle hardware: %d\n", ret);
    i915_gem_retire_requests(dev);
    mutex_unlock(&dev->struct_mutex);

    /* Cancel the retire work handler, which should be idle now. */
    cancel_delayed_work_sync(&dev_priv->mm.retire_work);

    io_mapping_free(dev_priv->mm.gtt_mapping);
    if (dev_priv->mm.gtt_mtrr >= 0) {
        mtrr_del(dev_priv->mm.gtt_mtrr,
             dev_priv->mm.gtt_base_addr,
             dev_priv->mm.gtt->gtt_mappable_entries * PAGE_SIZE);
        dev_priv->mm.gtt_mtrr = -1;
    }

    acpi_video_unregister();

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

        /*
         * free the memory space allocated for the child device
         * config parsed from VBT
         */
        if (dev_priv->child_dev && dev_priv->child_dev_num) {
            kfree(dev_priv->child_dev);
            dev_priv->child_dev = NULL;
            dev_priv->child_dev_num = 0;
        }

        vga_switcheroo_unregister_client(dev->pdev);
        vga_client_register(dev->pdev, NULL, NULL, NULL);
    }

    /* Free error state after interrupts are fully disabled. */
    del_timer_sync(&dev_priv->hangcheck_timer);
    cancel_work_sync(&dev_priv->error_work);
    i915_destroy_error_state(dev);

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

    intel_opregion_fini(dev);

    if (drm_core_check_feature(dev, DRIVER_MODESET)) {
        /* Flush any outstanding unpin_work. */
        flush_workqueue(dev_priv->wq);

        mutex_lock(&dev->struct_mutex);
        i915_gem_free_all_phys_object(dev);
        i915_gem_cleanup_ringbuffer(dev);
        i915_gem_context_fini(dev);
        mutex_unlock(&dev->struct_mutex);
        i915_gem_cleanup_aliasing_ppgtt(dev);
        i915_gem_cleanup_stolen(dev);
        drm_mm_takedown(&dev_priv->mm.stolen);

        intel_cleanup_overlay(dev);

        if (!I915_NEED_GFX_HWS(dev))
            i915_free_hws(dev);
    }

    if (dev_priv->regs != NULL)
        pci_iounmap(dev->pdev, dev_priv->regs);

    intel_teardown_gmbus(dev);
    intel_teardown_mchbar(dev);

    destroy_workqueue(dev_priv->wq);

    pci_dev_put(dev_priv->bridge_dev);
    kfree(dev->dev_private);

    return 0;
}

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

    DRM_DEBUG_DRIVER("\n");
    file_priv = kmalloc(sizeof(*file_priv), GFP_KERNEL);
    if (!file_priv)
        return -ENOMEM;

    file->driver_priv = file_priv;

    spin_lock_init(&file_priv->mm.lock);
    INIT_LIST_HEAD(&file_priv->mm.request_list);

    idr_init(&file_priv->context_idr);

    return 0;
}

void i915_driver_lastclose(struct drm_device * dev)
{
    drm_i915_private_t *dev_priv = dev->dev_private;

    /* On gen6+ we refuse to init without kms enabled, but then the drm core
     * goes right around and calls lastclose. Check for this and don't clean
     * up anything. */
    if (!dev_priv)
        return;

    if (drm_core_check_feature(dev, DRIVER_MODESET)) {
        intel_fb_restore_mode(dev);
        vga_switcheroo_process_delayed_switch();
        return;
    }

    i915_gem_lastclose(dev);

    i915_dma_cleanup(dev);
}

void i915_driver_preclose(struct drm_device * dev, struct drm_file *file_priv)
{
    i915_gem_context_close(dev, file_priv);
    i915_gem_release(dev, file_priv);
}

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

    kfree(file_priv);
}

struct drm_ioctl_desc i915_ioctls[] = {
    DRM_IOCTL_DEF_DRV(I915_INIT, i915_dma_init, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(I915_FLUSH, i915_flush_ioctl, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_FLIP, i915_flip_bufs, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_BATCHBUFFER, i915_batchbuffer, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_IRQ_EMIT, i915_irq_emit, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_IRQ_WAIT, i915_irq_wait, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_GETPARAM, i915_getparam, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_SETPARAM, i915_setparam, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(I915_ALLOC, drm_noop, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_FREE, drm_noop, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_INIT_HEAP, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(I915_CMDBUFFER, i915_cmdbuffer, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_DESTROY_HEAP,  drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(I915_SET_VBLANK_PIPE,  drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(I915_GET_VBLANK_PIPE,  i915_vblank_pipe_get, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_VBLANK_SWAP, i915_vblank_swap, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(I915_HWS_ADDR, i915_set_status_page, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(I915_GEM_INIT, i915_gem_init_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER, i915_gem_execbuffer, DRM_AUTH|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2, i915_gem_execbuffer2, DRM_AUTH|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_PIN, i915_gem_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_UNPIN, i915_gem_unpin_ioctl, DRM_AUTH|DRM_ROOT_ONLY|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_SET_CACHING, i915_gem_set_caching_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_GET_CACHING, i915_gem_get_caching_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_THROTTLE, i915_gem_throttle_ioctl, DRM_AUTH|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_ENTERVT, i915_gem_entervt_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_LEAVEVT, i915_gem_leavevt_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_CREATE, i915_gem_create_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_PREAD, i915_gem_pread_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_PWRITE, i915_gem_pwrite_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_MMAP, i915_gem_mmap_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_MMAP_GTT, i915_gem_mmap_gtt_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_SET_DOMAIN, i915_gem_set_domain_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_SW_FINISH, i915_gem_sw_finish_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_SET_TILING, i915_gem_set_tiling, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_GET_TILING, i915_gem_get_tiling, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_GET_APERTURE, i915_gem_get_aperture_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GET_PIPE_FROM_CRTC_ID, intel_get_pipe_from_crtc_id, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_MADVISE, i915_gem_madvise_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_OVERLAY_PUT_IMAGE, intel_overlay_put_image, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_OVERLAY_ATTRS, intel_overlay_attrs, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_SET_SPRITE_COLORKEY, intel_sprite_set_colorkey, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GET_SPRITE_COLORKEY, intel_sprite_get_colorkey, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_WAIT, i915_gem_wait_ioctl, DRM_AUTH|DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_CREATE, i915_gem_context_create_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_DESTROY, i915_gem_context_destroy_ioctl, DRM_UNLOCKED),
    DRM_IOCTL_DEF_DRV(I915_REG_READ, i915_reg_read_ioctl, DRM_UNLOCKED),
};

int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);

/*
 * This is really ugly: Because old userspace abused the linux agp interface to
 * manage the gtt, we need to claim that all intel devices are agp.  For
 * otherwise the drm core refuses to initialize the agp support code.
 */
int i915_driver_device_is_agp(struct drm_device * dev)
{
    return 1;
}