[deliverable/linux.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.
 *
 */

#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 <linux/pm.h>
#include <linux/pm_runtime.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))

/**
 * Lock test for when it's just for synchronization of ring access.
 *
 * In that case, we don't need to do it when GEM is initialized as nobody else
 * has access to the ring.
 */
#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)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv;

        /*
         * The dri breadcrumb update races against the drm master disappearing.
         * Instead of trying to fix this (this is by far not the only ums issue)
         * just don't do the update in kms mode.
         */
        if (drm_core_check_feature(dev, DRIVER_MODESET))
                return;

        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)
{
        struct drm_i915_private *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);
}

/**
 * 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)
{
        struct drm_i915_private *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)
{
        struct drm_i915_private *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 + I915_RING_FREE_SPACE);
        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)
{
        struct drm_i915_private *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)
{
        struct drm_i915_private *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)
{
        struct drm_i915_private *dev_priv = 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)
{
        struct drm_i915_private *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)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;

        dev_priv->dri1.counter++;
        if (dev_priv->dri1.counter > 0x7FFFFFFFUL)
                dev_priv->dri1.counter = 0;
        if (master_priv->sarea_priv)
                master_priv->sarea_priv->last_enqueue = dev_priv->dri1.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->dri1.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)
{
        struct drm_i915_private *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->dri1.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->dri1.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)
{
        i915_kernel_lost_context(dev);
        return intel_ring_idle(LP_RING(dev->dev_private));
}

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)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv;
        drm_i915_sarea_t *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;

        master_priv = dev->primary->master->driver_priv;
        sarea_priv = (drm_i915_sarea_t *) master_priv->sarea_priv;

        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(*cliprects),
                                    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)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv;
        drm_i915_sarea_t *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;

        master_priv = dev->primary->master->driver_priv;
        sarea_priv = (drm_i915_sarea_t *) master_priv->sarea_priv;

        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(*cliprects), 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)
{
        struct drm_i915_private *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->dri1.counter++;
        if (dev_priv->dri1.counter > 0x7FFFFFFFUL)
                dev_priv->dri1.counter = 1;
        if (master_priv->sarea_priv)
                master_priv->sarea_priv->last_enqueue = dev_priv->dri1.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->dri1.counter);
                OUT_RING(MI_USER_INTERRUPT);
                ADVANCE_LP_RING();
        }

        return dev_priv->dri1.counter;
}

static int i915_wait_irq(struct drm_device * dev, int irq_nr)
{
        struct drm_i915_private *dev_priv = 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 * 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->dri1.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)
{
        struct drm_i915_private *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 (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)
{
        struct drm_i915_private *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)
{
        struct drm_i915_private *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;
}

/**
 * Schedule buffer swap at given vertical blank.
 */
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)
{
        struct drm_i915_private *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->pdev->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_VEBOX:
                value = intel_ring_initialized(&dev_priv->ring[VECS]);
                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_WT:
                value = HAS_WT(dev);
                break;
        case I915_PARAM_HAS_ALIASING_PPGTT:
                value = dev_priv->mm.aliasing_ppgtt || USES_FULL_PPGTT(dev);
                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;
        case I915_PARAM_HAS_SECURE_BATCHES:
                value = capable(CAP_SYS_ADMIN);
                break;
        case I915_PARAM_HAS_PINNED_BATCHES:
                value = 1;
                break;
        case I915_PARAM_HAS_EXEC_NO_RELOC:
                value = 1;
                break;
        case I915_PARAM_HAS_EXEC_HANDLE_LUT:
                value = 1;
                break;
        case I915_PARAM_CMD_PARSER_VERSION:
                value = i915_cmd_parser_get_version();
                break;
        default:
                DRM_DEBUG("Unknown parameter %d\n", param->param);
                return -EINVAL;
        }

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

        return 0;
}

static int i915_setparam(struct drm_device *dev, void *data,
                         struct drm_file *file_priv)
{
        struct drm_i915_private *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)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        drm_i915_hws_addr_t *hws = data;
        struct intel_ring_buffer *ring;

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

        dev_priv->dri1.gfx_hws_cpu_addr =
                ioremap_wc(dev_priv->gtt.mappable_base + 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)
{
        struct drm_i915_private *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)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        int mchbar_reg = INTEL_INFO(dev)->gen >= 4 ? MCHBAR_I965 : MCHBAR_I915;
        u32 temp;
        bool enabled;

        if (IS_VALLEYVIEW(dev))
                return;

        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)
{
        struct drm_i915_private *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);

        /*
         * FIXME: open_count is protected by drm_global_mutex but that would lead to
         * locking inversion with the driver load path. And the access here is
         * completely racy anyway. So don't bother with locking for now.
         */
        return dev->open_count == 0;
}

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, false);
        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_power_domains_init_hw(dev_priv);

        ret = drm_irq_install(dev, dev->pdev->irq);
        if (ret)
                goto cleanup_gem_stolen;

        /* Important: The output setup functions called by modeset_init need
         * working irqs for e.g. gmbus and dp aux transfers. */
        intel_modeset_init(dev);

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

        INIT_WORK(&dev_priv->console_resume_work, intel_console_resume);

        intel_modeset_gem_init(dev);

        /* Always safe in the mode setting case. */
        /* FIXME: do pre/post-mode set stuff in core KMS code */
        dev->vblank_disable_allowed = true;
        if (INTEL_INFO(dev)->num_pipes == 0) {
                intel_display_power_put(dev_priv, POWER_DOMAIN_VGA);
                return 0;
        }

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

        /* Only enable hotplug handling once the fbdev is fully set up. */
        intel_hpd_init(dev);

        /*
         * Some ports require correctly set-up hpd registers for detection to
         * work properly (leading to ghost connected connector status), e.g. VGA
         * on gm45.  Hence we can only set up the initial fbdev config after hpd
         * irqs are fully enabled. Now we should scan for the initial config
         * only once hotplug handling is enabled, but due to screwed-up locking
         * around kms/fbdev init we can't protect the fdbev initial config
         * scanning against hotplug events. Hence do this first and ignore the
         * tiny window where we will loose hotplug notifactions.
         */
        intel_fbdev_initial_config(dev);

        /* Only enable hotplug handling once the fbdev is fully set up. */
        dev_priv->enable_hotplug_processing = true;

        drm_kms_helper_poll_init(dev);

        return 0;

cleanup_gem:
        mutex_lock(&dev->struct_mutex);
        i915_gem_cleanup_ringbuffer(dev);
        i915_gem_context_fini(dev);
        mutex_unlock(&dev->struct_mutex);
        WARN_ON(dev_priv->mm.aliasing_ppgtt);
        drm_mm_takedown(&dev_priv->gtt.base.mm);
cleanup_power:
        intel_display_power_put(dev_priv, POWER_DOMAIN_VGA);
        drm_irq_uninstall(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;
}

#if IS_ENABLED(CONFIG_FB)
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->gtt.mappable_base;
        ap->ranges[0].size = dev_priv->gtt.mappable_end;

        primary =
                pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;

        remove_conflicting_framebuffers(ap, "inteldrmfb", primary);

        kfree(ap);
}
#else
static void i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
{
}
#endif

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

#define PRINT_S(name) "%s"
#define SEP_EMPTY
#define PRINT_FLAG(name) info->name ? #name "," : ""
#define SEP_COMMA ,
        DRM_DEBUG_DRIVER("i915 device info: gen=%i, pciid=0x%04x flags="
                         DEV_INFO_FOR_EACH_FLAG(PRINT_S, SEP_EMPTY),
                         info->gen,
                         dev_priv->dev->pdev->device,
                         DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG, SEP_COMMA));
#undef PRINT_S
#undef SEP_EMPTY
#undef PRINT_FLAG
#undef SEP_COMMA
}

/*
 * Determine various intel_device_info fields at runtime.
 *
 * Use it when either:
 *   - it's judged too laborious to fill n static structures with the limit
 *     when a simple if statement does the job,
 *   - run-time checks (eg read fuse/strap registers) are needed.
 *
 * This function needs to be called:
 *   - after the MMIO has been setup as we are reading registers,
 *   - after the PCH has been detected,
 *   - before the first usage of the fields it can tweak.
 */
static void intel_device_info_runtime_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_device_info *info;
        enum pipe pipe;

        info = (struct intel_device_info *)&dev_priv->info;

        if (IS_VALLEYVIEW(dev))
                for_each_pipe(pipe)
                        info->num_sprites[pipe] = 2;
        else
                for_each_pipe(pipe)
                        info->num_sprites[pipe] = 1;

        if (i915.disable_display) {
                DRM_INFO("Display disabled (module parameter)\n");
                info->num_pipes = 0;
        } else if (info->num_pipes > 0 &&
                   (INTEL_INFO(dev)->gen == 7 || INTEL_INFO(dev)->gen == 8) &&
                   !IS_VALLEYVIEW(dev)) {
                u32 fuse_strap = I915_READ(FUSE_STRAP);
                u32 sfuse_strap = I915_READ(SFUSE_STRAP);

                /*
                 * SFUSE_STRAP is supposed to have a bit signalling the display
                 * is fused off. Unfortunately it seems that, at least in
                 * certain cases, fused off display means that PCH display
                 * reads don't land anywhere. In that case, we read 0s.
                 *
                 * On CPT/PPT, we can detect this case as SFUSE_STRAP_FUSE_LOCK
                 * should be set when taking over after the firmware.
                 */
                if (fuse_strap & ILK_INTERNAL_DISPLAY_DISABLE ||
                    sfuse_strap & SFUSE_STRAP_DISPLAY_DISABLED ||
                    (dev_priv->pch_type == PCH_CPT &&
                     !(sfuse_strap & SFUSE_STRAP_FUSE_LOCK))) {
                        DRM_INFO("Display fused off, disabling\n");
                        info->num_pipes = 0;
                }
        }
}

/**
 * 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;
        struct intel_device_info *info, *device_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)) {
                DRM_INFO("Your hardware requires kernel modesetting (KMS)\n");
                DRM_INFO("See CONFIG_DRM_I915_KMS, nomodeset, and i915.modeset parameters\n");
                return -ENODEV;
        }

        /* UMS needs agp support. */
        if (!drm_core_check_feature(dev, DRIVER_MODESET) && !dev->agp)
                return -EINVAL;

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

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

        /* copy initial configuration to dev_priv->info */
        device_info = (struct intel_device_info *)&dev_priv->info;
        *device_info = *info;

        spin_lock_init(&dev_priv->irq_lock);
        spin_lock_init(&dev_priv->gpu_error.lock);
        spin_lock_init(&dev_priv->backlight_lock);
        spin_lock_init(&dev_priv->uncore.lock);
        spin_lock_init(&dev_priv->mm.object_stat_lock);
        mutex_init(&dev_priv->dpio_lock);
        mutex_init(&dev_priv->modeset_restore_lock);

        intel_pm_setup(dev);

        intel_display_crc_init(dev);

        i915_dump_device_info(dev_priv);

        /* Not all pre-production machines fall into this category, only the
         * very first ones. Almost everything should work, except for maybe
         * suspend/resume. And we don't implement workarounds that affect only
         * pre-production machines. */
        if (IS_HSW_EARLY_SDV(dev))
                DRM_INFO("This is an early pre-production Haswell machine. "
                         "It may not be fully functional.\n");

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

        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_bridge;
        }

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

        intel_uncore_init(dev);

        ret = i915_gem_gtt_init(dev);
        if (ret)
                goto out_regs;

        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));

        aperture_size = dev_priv->gtt.mappable_end;

        dev_priv->gtt.mappable =
                io_mapping_create_wc(dev_priv->gtt.mappable_base,
                                     aperture_size);
        if (dev_priv->gtt.mappable == NULL) {
                ret = -EIO;
                goto out_gtt;
        }

        dev_priv->gtt.mtrr = arch_phys_wc_add(dev_priv->gtt.mappable_base,
                                              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;
        }

        intel_irq_init(dev);
        intel_uncore_sanitize(dev);

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

        intel_setup_bios(dev);

        i915_gem_load(dev);

        /* 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_device_info_runtime_init(dev);

        if (INTEL_INFO(dev)->num_pipes) {
                ret = drm_vblank_init(dev, INTEL_INFO(dev)->num_pipes);
                if (ret)
                        goto out_gem_unload;
        }

        intel_power_domains_init(dev_priv);

        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_power_well;
                }
        } else {
                /* Start out suspended in ums mode. */
                dev_priv->ums.mm_suspended = 1;
        }

        i915_setup_sysfs(dev);

        if (INTEL_INFO(dev)->num_pipes) {
                /* Must be done after probing outputs */
                intel_opregion_init(dev);
                acpi_video_register();
        }

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

        intel_init_runtime_pm(dev_priv);

        return 0;

out_power_well:
        intel_power_domains_remove(dev_priv);
        drm_vblank_cleanup(dev);
out_gem_unload:
        if (dev_priv->mm.inactive_shrinker.scan_objects)
                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);
        pm_qos_remove_request(&dev_priv->pm_qos);
        destroy_workqueue(dev_priv->wq);
out_mtrrfree:
        arch_phys_wc_del(dev_priv->gtt.mtrr);
        io_mapping_free(dev_priv->gtt.mappable);
out_gtt:
        list_del(&dev_priv->gtt.base.global_link);
        drm_mm_takedown(&dev_priv->gtt.base.mm);
        dev_priv->gtt.base.cleanup(&dev_priv->gtt.base);
out_regs:
        intel_uncore_fini(dev);
        pci_iounmap(dev->pdev, dev_priv->regs);
put_bridge:
        pci_dev_put(dev_priv->bridge_dev);
free_priv:
        if (dev_priv->slab)
                kmem_cache_destroy(dev_priv->slab);
        kfree(dev_priv);
        return ret;
}

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

        ret = i915_gem_suspend(dev);
        if (ret) {
                DRM_ERROR("failed to idle hardware: %d\n", ret);
                return ret;
        }

        intel_fini_runtime_pm(dev_priv);

        intel_gpu_ips_teardown();

        /* The i915.ko module is still not prepared to be loaded when
         * the power well is not enabled, so just enable it in case
         * we're going to unload/reload. */
        intel_display_set_init_power(dev_priv, true);
        intel_power_domains_remove(dev_priv);

        i915_teardown_sysfs(dev);

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

        io_mapping_free(dev_priv->gtt.mappable);
        arch_phys_wc_del(dev_priv->gtt.mtrr);

        acpi_video_unregister();

        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                intel_fbdev_fini(dev);
                intel_modeset_cleanup(dev);
                cancel_work_sync(&dev_priv->console_resume_work);

                /*
                 * free the memory space allocated for the child device
                 * config parsed from VBT
                 */
                if (dev_priv->vbt.child_dev && dev_priv->vbt.child_dev_num) {
                        kfree(dev_priv->vbt.child_dev);
                        dev_priv->vbt.child_dev = NULL;
                        dev_priv->vbt.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->gpu_error.hangcheck_timer);
        cancel_work_sync(&dev_priv->gpu_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);
                WARN_ON(dev_priv->mm.aliasing_ppgtt);
                mutex_unlock(&dev->struct_mutex);
                i915_gem_cleanup_stolen(dev);

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

        list_del(&dev_priv->gtt.base.global_link);
        WARN_ON(!list_empty(&dev_priv->vm_list));

        drm_vblank_cleanup(dev);

        intel_teardown_gmbus(dev);
        intel_teardown_mchbar(dev);

        destroy_workqueue(dev_priv->wq);
        pm_qos_remove_request(&dev_priv->pm_qos);

        dev_priv->gtt.base.cleanup(&dev_priv->gtt.base);

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

        if (dev_priv->slab)
                kmem_cache_destroy(dev_priv->slab);

        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)
{
        int ret;

        ret = i915_gem_open(dev, file);
        if (ret)
                return ret;

        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 GTT
 * 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)
{
        struct drm_i915_private *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_fbdev_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)
{
        mutex_lock(&dev->struct_mutex);
        i915_gem_context_close(dev, file_priv);
        i915_gem_release(dev, file_priv);
        mutex_unlock(&dev->struct_mutex);
}

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);
}

const 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_RENDER_ALLOW),
        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_RENDER_ALLOW),
        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_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_CACHING, i915_gem_set_caching_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_CACHING, i915_gem_get_caching_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_THROTTLE, i915_gem_throttle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
        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_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PREAD, i915_gem_pread_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_PWRITE, i915_gem_pwrite_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_MMAP, i915_gem_mmap_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_MMAP_GTT, i915_gem_mmap_gtt_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_DOMAIN, i915_gem_set_domain_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SW_FINISH, i915_gem_sw_finish_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_SET_TILING, i915_gem_set_tiling, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_TILING, i915_gem_get_tiling, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_GET_APERTURE, i915_gem_get_aperture_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        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_RENDER_ALLOW),
        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_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_CREATE, i915_gem_context_create_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_DESTROY, i915_gem_context_destroy_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_REG_READ, i915_reg_read_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(I915_GET_RESET_STATS, i915_get_reset_stats_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
};

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;
}