drivers/gpu/drm/i915/i915_debugfs.c

/*
 * Copyright © 2008 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *    Keith Packard <keithp@keithp.com>
 *
 */

#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include "drmP.h"
#include "drm.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"

#define DRM_I915_RING_DEBUG 1


#if defined(CONFIG_DEBUG_FS)

enum {
	ACTIVE_LIST,
	FLUSHING_LIST,
	INACTIVE_LIST,
	PINNED_LIST,
	DEFERRED_FREE_LIST,
};

enum {
	RENDER_RING,
	BSD_RING,
	BLT_RING,
};

static const char *yesno(int v)
{
	return v ? "yes" : "no";
}

static int i915_capabilities(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	const struct intel_device_info *info = INTEL_INFO(dev);

	seq_printf(m, "gen: %d\n", info->gen);
#define B(x) seq_printf(m, #x ": %s\n", yesno(info->x))
	B(is_mobile);
	B(is_i85x);
	B(is_i915g);
	B(is_i945gm);
	B(is_g33);
	B(need_gfx_hws);
	B(is_g4x);
	B(is_pineview);
	B(is_broadwater);
	B(is_crestline);
	B(has_fbc);
	B(has_rc6);
	B(has_pipe_cxsr);
	B(has_hotplug);
	B(cursor_needs_physical);
	B(has_overlay);
	B(overlay_needs_physical);
	B(supports_tv);
	B(has_bsd_ring);
	B(has_blt_ring);
#undef B

	return 0;
}

static const char *get_pin_flag(struct drm_i915_gem_object *obj_priv)
{
	if (obj_priv->user_pin_count > 0)
		return "P";
	else if (obj_priv->pin_count > 0)
		return "p";
	else
		return " ";
}

static const char *get_tiling_flag(struct drm_i915_gem_object *obj_priv)
{
    switch (obj_priv->tiling_mode) {
    default:
    case I915_TILING_NONE: return " ";
    case I915_TILING_X: return "X";
    case I915_TILING_Y: return "Y";
    }
}

static void
describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
{
	seq_printf(m, "%p: %s%s %8zd %08x %08x %d%s%s",
		   &obj->base,
		   get_pin_flag(obj),
		   get_tiling_flag(obj),
		   obj->base.size,
		   obj->base.read_domains,
		   obj->base.write_domain,
		   obj->last_rendering_seqno,
		   obj->dirty ? " dirty" : "",
		   obj->madv == I915_MADV_DONTNEED ? " purgeable" : "");
	if (obj->base.name)
		seq_printf(m, " (name: %d)", obj->base.name);
	if (obj->fence_reg != I915_FENCE_REG_NONE)
		seq_printf(m, " (fence: %d)", obj->fence_reg);
	if (obj->gtt_space != NULL)
		seq_printf(m, " (gtt offset: %08x, size: %08x)",
			   obj->gtt_offset, (unsigned int)obj->gtt_space->size);
	if (obj->pin_mappable || obj->fault_mappable)
		seq_printf(m, " (mappable)");
	if (obj->ring != NULL)
		seq_printf(m, " (%s)", obj->ring->name);
}

static int i915_gem_object_list_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	uintptr_t list = (uintptr_t) node->info_ent->data;
	struct list_head *head;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_i915_gem_object *obj_priv;
	size_t total_obj_size, total_gtt_size;
	int count, ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	switch (list) {
	case ACTIVE_LIST:
		seq_printf(m, "Active:\n");
		head = &dev_priv->mm.active_list;
		break;
	case INACTIVE_LIST:
		seq_printf(m, "Inactive:\n");
		head = &dev_priv->mm.inactive_list;
		break;
	case PINNED_LIST:
		seq_printf(m, "Pinned:\n");
		head = &dev_priv->mm.pinned_list;
		break;
	case FLUSHING_LIST:
		seq_printf(m, "Flushing:\n");
		head = &dev_priv->mm.flushing_list;
		break;
	case DEFERRED_FREE_LIST:
		seq_printf(m, "Deferred free:\n");
		head = &dev_priv->mm.deferred_free_list;
		break;
	default:
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	total_obj_size = total_gtt_size = count = 0;
	list_for_each_entry(obj_priv, head, mm_list) {
		seq_printf(m, "   ");
		describe_obj(m, obj_priv);
		seq_printf(m, "\n");
		total_obj_size += obj_priv->base.size;
		total_gtt_size += obj_priv->gtt_space->size;
		count++;
	}
	mutex_unlock(&dev->struct_mutex);

	seq_printf(m, "Total %d objects, %zu bytes, %zu GTT size\n",
		   count, total_obj_size, total_gtt_size);
	return 0;
}

static int i915_gem_object_info(struct seq_file *m, void* data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	seq_printf(m, "%u objects\n", dev_priv->mm.object_count);
	seq_printf(m, "%zu object bytes\n", dev_priv->mm.object_memory);
	seq_printf(m, "%u pinned\n", dev_priv->mm.pin_count);
	seq_printf(m, "%zu pin bytes\n", dev_priv->mm.pin_memory);
	seq_printf(m, "%u mappable objects in gtt\n", dev_priv->mm.gtt_mappable_count);
	seq_printf(m, "%zu mappable gtt bytes\n", dev_priv->mm.gtt_mappable_memory);
	seq_printf(m, "%zu mappable gtt used bytes\n", dev_priv->mm.mappable_gtt_used);
	seq_printf(m, "%zu mappable gtt total\n", dev_priv->mm.mappable_gtt_total);
	seq_printf(m, "%u objects in gtt\n", dev_priv->mm.gtt_count);
	seq_printf(m, "%zu gtt bytes\n", dev_priv->mm.gtt_memory);
	seq_printf(m, "%zu gtt total\n", dev_priv->mm.gtt_total);

	mutex_unlock(&dev->struct_mutex);

	return 0;
}


static int i915_gem_pageflip_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	unsigned long flags;
	struct intel_crtc *crtc;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, base.head) {
		const char *pipe = crtc->pipe ? "B" : "A";
		const char *plane = crtc->plane ? "B" : "A";
		struct intel_unpin_work *work;

		spin_lock_irqsave(&dev->event_lock, flags);
		work = crtc->unpin_work;
		if (work == NULL) {
			seq_printf(m, "No flip due on pipe %s (plane %s)\n",
				   pipe, plane);
		} else {
			if (!work->pending) {
				seq_printf(m, "Flip queued on pipe %s (plane %s)\n",
					   pipe, plane);
			} else {
				seq_printf(m, "Flip pending (waiting for vsync) on pipe %s (plane %s)\n",
					   pipe, plane);
			}
			if (work->enable_stall_check)
				seq_printf(m, "Stall check enabled, ");
			else
				seq_printf(m, "Stall check waiting for page flip ioctl, ");
			seq_printf(m, "%d prepares\n", work->pending);

			if (work->old_fb_obj) {
				struct drm_i915_gem_object *obj_priv = to_intel_bo(work->old_fb_obj);
				if(obj_priv)
					seq_printf(m, "Old framebuffer gtt_offset 0x%08x\n", obj_priv->gtt_offset );
			}
			if (work->pending_flip_obj) {
				struct drm_i915_gem_object *obj_priv = to_intel_bo(work->pending_flip_obj);
				if(obj_priv)
					seq_printf(m, "New framebuffer gtt_offset 0x%08x\n", obj_priv->gtt_offset );
			}
		}
		spin_unlock_irqrestore(&dev->event_lock, flags);
	}

	return 0;
}

static int i915_gem_request_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_i915_gem_request *gem_request;
	int ret, count;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	count = 0;
	if (!list_empty(&dev_priv->render_ring.request_list)) {
		seq_printf(m, "Render requests:\n");
		list_for_each_entry(gem_request,
				    &dev_priv->render_ring.request_list,
				    list) {
			seq_printf(m, "    %d @ %d\n",
				   gem_request->seqno,
				   (int) (jiffies - gem_request->emitted_jiffies));
		}
		count++;
	}
	if (!list_empty(&dev_priv->bsd_ring.request_list)) {
		seq_printf(m, "BSD requests:\n");
		list_for_each_entry(gem_request,
				    &dev_priv->bsd_ring.request_list,
				    list) {
			seq_printf(m, "    %d @ %d\n",
				   gem_request->seqno,
				   (int) (jiffies - gem_request->emitted_jiffies));
		}
		count++;
	}
	if (!list_empty(&dev_priv->blt_ring.request_list)) {
		seq_printf(m, "BLT requests:\n");
		list_for_each_entry(gem_request,
				    &dev_priv->blt_ring.request_list,
				    list) {
			seq_printf(m, "    %d @ %d\n",
				   gem_request->seqno,
				   (int) (jiffies - gem_request->emitted_jiffies));
		}
		count++;
	}
	mutex_unlock(&dev->struct_mutex);

	if (count == 0)
		seq_printf(m, "No requests\n");

	return 0;
}

static void i915_ring_seqno_info(struct seq_file *m,
				 struct intel_ring_buffer *ring)
{
	if (ring->get_seqno) {
		seq_printf(m, "Current sequence (%s): %d\n",
			   ring->name, ring->get_seqno(ring));
		seq_printf(m, "Waiter sequence (%s):  %d\n",
			   ring->name, ring->waiting_seqno);
		seq_printf(m, "IRQ sequence (%s):     %d\n",
			   ring->name, ring->irq_seqno);
	}
}

static int i915_gem_seqno_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	int ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	i915_ring_seqno_info(m, &dev_priv->render_ring);
	i915_ring_seqno_info(m, &dev_priv->bsd_ring);
	i915_ring_seqno_info(m, &dev_priv->blt_ring);

	mutex_unlock(&dev->struct_mutex);

	return 0;
}


static int i915_interrupt_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	int ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	if (!HAS_PCH_SPLIT(dev)) {
		seq_printf(m, "Interrupt enable:    %08x\n",
			   I915_READ(IER));
		seq_printf(m, "Interrupt identity:  %08x\n",
			   I915_READ(IIR));
		seq_printf(m, "Interrupt mask:      %08x\n",
			   I915_READ(IMR));
		seq_printf(m, "Pipe A stat:         %08x\n",
			   I915_READ(PIPEASTAT));
		seq_printf(m, "Pipe B stat:         %08x\n",
			   I915_READ(PIPEBSTAT));
	} else {
		seq_printf(m, "North Display Interrupt enable:		%08x\n",
			   I915_READ(DEIER));
		seq_printf(m, "North Display Interrupt identity:	%08x\n",
			   I915_READ(DEIIR));
		seq_printf(m, "North Display Interrupt mask:		%08x\n",
			   I915_READ(DEIMR));
		seq_printf(m, "South Display Interrupt enable:		%08x\n",
			   I915_READ(SDEIER));
		seq_printf(m, "South Display Interrupt identity:	%08x\n",
			   I915_READ(SDEIIR));
		seq_printf(m, "South Display Interrupt mask:		%08x\n",
			   I915_READ(SDEIMR));
		seq_printf(m, "Graphics Interrupt enable:		%08x\n",
			   I915_READ(GTIER));
		seq_printf(m, "Graphics Interrupt identity:		%08x\n",
			   I915_READ(GTIIR));
		seq_printf(m, "Graphics Interrupt mask:		%08x\n",
			   I915_READ(GTIMR));
	}
	seq_printf(m, "Interrupts received: %d\n",
		   atomic_read(&dev_priv->irq_received));
	i915_ring_seqno_info(m, &dev_priv->render_ring);
	i915_ring_seqno_info(m, &dev_priv->bsd_ring);
	i915_ring_seqno_info(m, &dev_priv->blt_ring);
	mutex_unlock(&dev->struct_mutex);

	return 0;
}

static int i915_gem_fence_regs_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	int i, ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	seq_printf(m, "Reserved fences = %d\n", dev_priv->fence_reg_start);
	seq_printf(m, "Total fences = %d\n", dev_priv->num_fence_regs);
	for (i = 0; i < dev_priv->num_fence_regs; i++) {
		struct drm_gem_object *obj = dev_priv->fence_regs[i].obj;

		seq_printf(m, "Fenced object[%2d] = ", i);
		if (obj == NULL)
			seq_printf(m, "unused");
		else
			describe_obj(m, to_intel_bo(obj));
		seq_printf(m, "\n");
	}
	mutex_unlock(&dev->struct_mutex);

	return 0;
}

static int i915_hws_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	int i;
	volatile u32 *hws;

	hws = (volatile u32 *)dev_priv->render_ring.status_page.page_addr;
	if (hws == NULL)
		return 0;

	for (i = 0; i < 4096 / sizeof(u32) / 4; i += 4) {
		seq_printf(m, "0x%08x: 0x%08x 0x%08x 0x%08x 0x%08x\n",
			   i * 4,
			   hws[i], hws[i + 1], hws[i + 2], hws[i + 3]);
	}
	return 0;
}

static void i915_dump_object(struct seq_file *m,
			     struct io_mapping *mapping,
			     struct drm_i915_gem_object *obj_priv)
{
	int page, page_count, i;

	page_count = obj_priv->base.size / PAGE_SIZE;
	for (page = 0; page < page_count; page++) {
		u32 *mem = io_mapping_map_wc(mapping,
					     obj_priv->gtt_offset + page * PAGE_SIZE);
		for (i = 0; i < PAGE_SIZE; i += 4)
			seq_printf(m, "%08x :  %08x\n", i, mem[i / 4]);
		io_mapping_unmap(mem);
	}
}

static int i915_batchbuffer_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_gem_object *obj;
	struct drm_i915_gem_object *obj_priv;
	int ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	list_for_each_entry(obj_priv, &dev_priv->mm.active_list, mm_list) {
		obj = &obj_priv->base;
		if (obj->read_domains & I915_GEM_DOMAIN_COMMAND) {
		    seq_printf(m, "--- gtt_offset = 0x%08x\n",
			       obj_priv->gtt_offset);
		    i915_dump_object(m, dev_priv->mm.gtt_mapping, obj_priv);
		}
	}

	mutex_unlock(&dev->struct_mutex);

	return 0;
}

static int i915_ringbuffer_data(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_ring_buffer *ring;
	int ret;

	switch ((uintptr_t)node->info_ent->data) {
	case RENDER_RING: ring = &dev_priv->render_ring; break;
	case BSD_RING: ring = &dev_priv->bsd_ring; break;
	case BLT_RING: ring = &dev_priv->blt_ring; break;
	default: return -EINVAL;
	}

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	if (!ring->gem_object) {
		seq_printf(m, "No ringbuffer setup\n");
	} else {
		u8 *virt = ring->virtual_start;
		uint32_t off;

		for (off = 0; off < ring->size; off += 4) {
			uint32_t *ptr = (uint32_t *)(virt + off);
			seq_printf(m, "%08x :  %08x\n", off, *ptr);
		}
	}
	mutex_unlock(&dev->struct_mutex);

	return 0;
}

static int i915_ringbuffer_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_ring_buffer *ring;

	switch ((uintptr_t)node->info_ent->data) {
	case RENDER_RING: ring = &dev_priv->render_ring; break;
	case BSD_RING: ring = &dev_priv->bsd_ring; break;
	case BLT_RING: ring = &dev_priv->blt_ring; break;
	default: return -EINVAL;
	}

	if (ring->size == 0)
	    return 0;

	seq_printf(m, "Ring %s:\n", ring->name);
	seq_printf(m, "  Head :    %08x\n", I915_READ_HEAD(ring) & HEAD_ADDR);
	seq_printf(m, "  Tail :    %08x\n", I915_READ_TAIL(ring) & TAIL_ADDR);
	seq_printf(m, "  Size :    %08x\n", ring->size);
	seq_printf(m, "  Active :  %08x\n", intel_ring_get_active_head(ring));
	seq_printf(m, "  Control : %08x\n", I915_READ_CTL(ring));
	seq_printf(m, "  Start :   %08x\n", I915_READ_START(ring));

	return 0;
}

static const char *pin_flag(int pinned)
{
	if (pinned > 0)
		return " P";
	else if (pinned < 0)
		return " p";
	else
		return "";
}

static const char *tiling_flag(int tiling)
{
	switch (tiling) {
	default:
	case I915_TILING_NONE: return "";
	case I915_TILING_X: return " X";
	case I915_TILING_Y: return " Y";
	}
}

static const char *dirty_flag(int dirty)
{
	return dirty ? " dirty" : "";
}

static const char *purgeable_flag(int purgeable)
{
	return purgeable ? " purgeable" : "";
}

static int i915_error_state(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_i915_error_state *error;
	unsigned long flags;
	int i, page, offset, elt;

	spin_lock_irqsave(&dev_priv->error_lock, flags);
	if (!dev_priv->first_error) {
		seq_printf(m, "no error state collected\n");
		goto out;
	}

	error = dev_priv->first_error;

	seq_printf(m, "Time: %ld s %ld us\n", error->time.tv_sec,
		   error->time.tv_usec);
	seq_printf(m, "PCI ID: 0x%04x\n", dev->pci_device);
	seq_printf(m, "EIR: 0x%08x\n", error->eir);
	seq_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
	if (INTEL_INFO(dev)->gen >= 6) {
		seq_printf(m, "ERROR: 0x%08x\n", error->error);
		seq_printf(m, "Blitter command stream:\n");
		seq_printf(m, "  ACTHD:    0x%08x\n", error->bcs_acthd);
		seq_printf(m, "  IPEHR:    0x%08x\n", error->bcs_ipehr);
		seq_printf(m, "  IPEIR:    0x%08x\n", error->bcs_ipeir);
		seq_printf(m, "  INSTDONE: 0x%08x\n", error->bcs_instdone);
		seq_printf(m, "  seqno:    0x%08x\n", error->bcs_seqno);
	}
	seq_printf(m, "Render command stream:\n");
	seq_printf(m, "  ACTHD: 0x%08x\n", error->acthd);
	seq_printf(m, "  IPEIR: 0x%08x\n", error->ipeir);
	seq_printf(m, "  IPEHR: 0x%08x\n", error->ipehr);
	seq_printf(m, "  INSTDONE: 0x%08x\n", error->instdone);
	if (INTEL_INFO(dev)->gen >= 4) {
		seq_printf(m, "  INSTDONE1: 0x%08x\n", error->instdone1);
		seq_printf(m, "  INSTPS: 0x%08x\n", error->instps);
	}
	seq_printf(m, "  INSTPM: 0x%08x\n", error->instpm);
	seq_printf(m, "  seqno: 0x%08x\n", error->seqno);

	if (error->active_bo_count) {
		seq_printf(m, "Buffers [%d]:\n", error->active_bo_count);

		for (i = 0; i < error->active_bo_count; i++) {
			seq_printf(m, "  %08x %8zd %08x %08x %08x%s%s%s%s",
				   error->active_bo[i].gtt_offset,
				   error->active_bo[i].size,
				   error->active_bo[i].read_domains,
				   error->active_bo[i].write_domain,
				   error->active_bo[i].seqno,
				   pin_flag(error->active_bo[i].pinned),
				   tiling_flag(error->active_bo[i].tiling),
				   dirty_flag(error->active_bo[i].dirty),
				   purgeable_flag(error->active_bo[i].purgeable));

			if (error->active_bo[i].name)
				seq_printf(m, " (name: %d)", error->active_bo[i].name);
			if (error->active_bo[i].fence_reg != I915_FENCE_REG_NONE)
				seq_printf(m, " (fence: %d)", error->active_bo[i].fence_reg);

			seq_printf(m, "\n");
		}
	}

	for (i = 0; i < ARRAY_SIZE(error->batchbuffer); i++) {
		if (error->batchbuffer[i]) {
			struct drm_i915_error_object *obj = error->batchbuffer[i];

			seq_printf(m, "--- gtt_offset = 0x%08x\n", obj->gtt_offset);
			offset = 0;
			for (page = 0; page < obj->page_count; page++) {
				for (elt = 0; elt < PAGE_SIZE/4; elt++) {
					seq_printf(m, "%08x :  %08x\n", offset, obj->pages[page][elt]);
					offset += 4;
				}
			}
		}
	}

	if (error->ringbuffer) {
		struct drm_i915_error_object *obj = error->ringbuffer;

		seq_printf(m, "--- ringbuffer = 0x%08x\n", obj->gtt_offset);
		offset = 0;
		for (page = 0; page < obj->page_count; page++) {
			for (elt = 0; elt < PAGE_SIZE/4; elt++) {
				seq_printf(m, "%08x :  %08x\n", offset, obj->pages[page][elt]);
				offset += 4;
			}
		}
	}

	if (error->overlay)
		intel_overlay_print_error_state(m, error->overlay);

out:
	spin_unlock_irqrestore(&dev_priv->error_lock, flags);

	return 0;
}

static int i915_rstdby_delays(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	u16 crstanddelay = I915_READ16(CRSTANDVID);

	seq_printf(m, "w/ctx: %d, w/o ctx: %d\n", (crstanddelay >> 8) & 0x3f, (crstanddelay & 0x3f));

	return 0;
}

static int i915_cur_delayinfo(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	u16 rgvswctl = I915_READ16(MEMSWCTL);
	u16 rgvstat = I915_READ16(MEMSTAT_ILK);

	seq_printf(m, "Requested P-state: %d\n", (rgvswctl >> 8) & 0xf);
	seq_printf(m, "Requested VID: %d\n", rgvswctl & 0x3f);
	seq_printf(m, "Current VID: %d\n", (rgvstat & MEMSTAT_VID_MASK) >>
		   MEMSTAT_VID_SHIFT);
	seq_printf(m, "Current P-state: %d\n",
		   (rgvstat & MEMSTAT_PSTATE_MASK) >> MEMSTAT_PSTATE_SHIFT);

	return 0;
}

static int i915_delayfreq_table(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	u32 delayfreq;
	int i;

	for (i = 0; i < 16; i++) {
		delayfreq = I915_READ(PXVFREQ_BASE + i * 4);
		seq_printf(m, "P%02dVIDFREQ: 0x%08x (VID: %d)\n", i, delayfreq,
			   (delayfreq & PXVFREQ_PX_MASK) >> PXVFREQ_PX_SHIFT);
	}

	return 0;
}

static inline int MAP_TO_MV(int map)
{
	return 1250 - (map * 25);
}

static int i915_inttoext_table(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	u32 inttoext;
	int i;

	for (i = 1; i <= 32; i++) {
		inttoext = I915_READ(INTTOEXT_BASE_ILK + i * 4);
		seq_printf(m, "INTTOEXT%02d: 0x%08x\n", i, inttoext);
	}

	return 0;
}

static int i915_drpc_info(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	u32 rgvmodectl = I915_READ(MEMMODECTL);
	u32 rstdbyctl = I915_READ(MCHBAR_RENDER_STANDBY);
	u16 crstandvid = I915_READ16(CRSTANDVID);

	seq_printf(m, "HD boost: %s\n", (rgvmodectl & MEMMODE_BOOST_EN) ?
		   "yes" : "no");
	seq_printf(m, "Boost freq: %d\n",
		   (rgvmodectl & MEMMODE_BOOST_FREQ_MASK) >>
		   MEMMODE_BOOST_FREQ_SHIFT);
	seq_printf(m, "HW control enabled: %s\n",
		   rgvmodectl & MEMMODE_HWIDLE_EN ? "yes" : "no");
	seq_printf(m, "SW control enabled: %s\n",
		   rgvmodectl & MEMMODE_SWMODE_EN ? "yes" : "no");
	seq_printf(m, "Gated voltage change: %s\n",
		   rgvmodectl & MEMMODE_RCLK_GATE ? "yes" : "no");
	seq_printf(m, "Starting frequency: P%d\n",
		   (rgvmodectl & MEMMODE_FSTART_MASK) >> MEMMODE_FSTART_SHIFT);
	seq_printf(m, "Max P-state: P%d\n",
		   (rgvmodectl & MEMMODE_FMAX_MASK) >> MEMMODE_FMAX_SHIFT);
	seq_printf(m, "Min P-state: P%d\n", (rgvmodectl & MEMMODE_FMIN_MASK));
	seq_printf(m, "RS1 VID: %d\n", (crstandvid & 0x3f));
	seq_printf(m, "RS2 VID: %d\n", ((crstandvid >> 8) & 0x3f));
	seq_printf(m, "Render standby enabled: %s\n",
		   (rstdbyctl & RCX_SW_EXIT) ? "no" : "yes");

	return 0;
}

static int i915_fbc_status(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;

	if (!I915_HAS_FBC(dev)) {
		seq_printf(m, "FBC unsupported on this chipset\n");
		return 0;
	}

	if (intel_fbc_enabled(dev)) {
		seq_printf(m, "FBC enabled\n");
	} else {
		seq_printf(m, "FBC disabled: ");
		switch (dev_priv->no_fbc_reason) {
		case FBC_NO_OUTPUT:
			seq_printf(m, "no outputs");
			break;
		case FBC_STOLEN_TOO_SMALL:
			seq_printf(m, "not enough stolen memory");
			break;
		case FBC_UNSUPPORTED_MODE:
			seq_printf(m, "mode not supported");
			break;
		case FBC_MODE_TOO_LARGE:
			seq_printf(m, "mode too large");
			break;
		case FBC_BAD_PLANE:
			seq_printf(m, "FBC unsupported on plane");
			break;
		case FBC_NOT_TILED:
			seq_printf(m, "scanout buffer not tiled");
			break;
		case FBC_MULTIPLE_PIPES:
			seq_printf(m, "multiple pipes are enabled");
			break;
		default:
			seq_printf(m, "unknown reason");
		}
		seq_printf(m, "\n");
	}
	return 0;
}

static int i915_sr_status(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	bool sr_enabled = false;

	if (IS_GEN5(dev))
		sr_enabled = I915_READ(WM1_LP_ILK) & WM1_LP_SR_EN;
	else if (IS_CRESTLINE(dev) || IS_I945G(dev) || IS_I945GM(dev))
		sr_enabled = I915_READ(FW_BLC_SELF) & FW_BLC_SELF_EN;
	else if (IS_I915GM(dev))
		sr_enabled = I915_READ(INSTPM) & INSTPM_SELF_EN;
	else if (IS_PINEVIEW(dev))
		sr_enabled = I915_READ(DSPFW3) & PINEVIEW_SELF_REFRESH_EN;

	seq_printf(m, "self-refresh: %s\n",
		   sr_enabled ? "enabled" : "disabled");

	return 0;
}

static int i915_emon_status(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	unsigned long temp, chipset, gfx;
	int ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	temp = i915_mch_val(dev_priv);
	chipset = i915_chipset_val(dev_priv);
	gfx = i915_gfx_val(dev_priv);
	mutex_unlock(&dev->struct_mutex);

	seq_printf(m, "GMCH temp: %ld\n", temp);
	seq_printf(m, "Chipset power: %ld\n", chipset);
	seq_printf(m, "GFX power: %ld\n", gfx);
	seq_printf(m, "Total power: %ld\n", chipset + gfx);

	return 0;
}

static int i915_gfxec(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;

	seq_printf(m, "GFXEC: %ld\n", (unsigned long)I915_READ(0x112f4));

	return 0;
}

static int i915_opregion(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_opregion *opregion = &dev_priv->opregion;
	int ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
		return ret;

	if (opregion->header)
		seq_write(m, opregion->header, OPREGION_SIZE);

	mutex_unlock(&dev->struct_mutex);

	return 0;
}

static int i915_gem_framebuffer_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_fbdev *ifbdev;
	struct intel_framebuffer *fb;
	int ret;

	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
	if (ret)
		return ret;

	ifbdev = dev_priv->fbdev;
	fb = to_intel_framebuffer(ifbdev->helper.fb);

	seq_printf(m, "fbcon size: %d x %d, depth %d, %d bpp, obj ",
		   fb->base.width,
		   fb->base.height,
		   fb->base.depth,
		   fb->base.bits_per_pixel);
	describe_obj(m, to_intel_bo(fb->obj));
	seq_printf(m, "\n");

	list_for_each_entry(fb, &dev->mode_config.fb_list, base.head) {
		if (&fb->base == ifbdev->helper.fb)
			continue;

		seq_printf(m, "user size: %d x %d, depth %d, %d bpp, obj ",
			   fb->base.width,
			   fb->base.height,
			   fb->base.depth,
			   fb->base.bits_per_pixel);
		describe_obj(m, to_intel_bo(fb->obj));
		seq_printf(m, "\n");
	}

	mutex_unlock(&dev->mode_config.mutex);

	return 0;
}

static int
i915_wedged_open(struct inode *inode,
		 struct file *filp)
{
	filp->private_data = inode->i_private;
	return 0;
}

static ssize_t
i915_wedged_read(struct file *filp,
		 char __user *ubuf,
		 size_t max,
		 loff_t *ppos)
{
	struct drm_device *dev = filp->private_data;
	drm_i915_private_t *dev_priv = dev->dev_private;
	char buf[80];
	int len;

	len = snprintf(buf, sizeof (buf),
		       "wedged :  %d\n",
		       atomic_read(&dev_priv->mm.wedged));

	if (len > sizeof (buf))
		len = sizeof (buf);

	return simple_read_from_buffer(ubuf, max, ppos, buf, len);
}

static ssize_t
i915_wedged_write(struct file *filp,
		  const char __user *ubuf,
		  size_t cnt,
		  loff_t *ppos)
{
	struct drm_device *dev = filp->private_data;
	drm_i915_private_t *dev_priv = dev->dev_private;
	char buf[20];
	int val = 1;

	if (cnt > 0) {
		if (cnt > sizeof (buf) - 1)
			return -EINVAL;

		if (copy_from_user(buf, ubuf, cnt))
			return -EFAULT;
		buf[cnt] = 0;

		val = simple_strtoul(buf, NULL, 0);
	}

	DRM_INFO("Manually setting wedged to %d\n", val);

	atomic_set(&dev_priv->mm.wedged, val);
	if (val) {
		wake_up_all(&dev_priv->irq_queue);
		queue_work(dev_priv->wq, &dev_priv->error_work);
	}

	return cnt;
}

static const struct file_operations i915_wedged_fops = {
	.owner = THIS_MODULE,
	.open = i915_wedged_open,
	.read = i915_wedged_read,
	.write = i915_wedged_write,
	.llseek = default_llseek,
};

/* As the drm_debugfs_init() routines are called before dev->dev_private is
 * allocated we need to hook into the minor for release. */
static int
drm_add_fake_info_node(struct drm_minor *minor,
		       struct dentry *ent,
		       const void *key)
{
	struct drm_info_node *node;

	node = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
	if (node == NULL) {
		debugfs_remove(ent);
		return -ENOMEM;
	}

	node->minor = minor;
	node->dent = ent;
	node->info_ent = (void *) key;
	list_add(&node->list, &minor->debugfs_nodes.list);

	return 0;
}

static int i915_wedged_create(struct dentry *root, struct drm_minor *minor)
{
	struct drm_device *dev = minor->dev;
	struct dentry *ent;

	ent = debugfs_create_file("i915_wedged",
				  S_IRUGO | S_IWUSR,
				  root, dev,
				  &i915_wedged_fops);
	if (IS_ERR(ent))
		return PTR_ERR(ent);

	return drm_add_fake_info_node(minor, ent, &i915_wedged_fops);
}

static struct drm_info_list i915_debugfs_list[] = {
	{"i915_capabilities", i915_capabilities, 0, 0},
	{"i915_gem_objects", i915_gem_object_info, 0},
	{"i915_gem_active", i915_gem_object_list_info, 0, (void *) ACTIVE_LIST},
	{"i915_gem_flushing", i915_gem_object_list_info, 0, (void *) FLUSHING_LIST},
	{"i915_gem_inactive", i915_gem_object_list_info, 0, (void *) INACTIVE_LIST},
	{"i915_gem_pinned", i915_gem_object_list_info, 0, (void *) PINNED_LIST},
	{"i915_gem_deferred_free", i915_gem_object_list_info, 0, (void *) DEFERRED_FREE_LIST},
	{"i915_gem_pageflip", i915_gem_pageflip_info, 0},
	{"i915_gem_request", i915_gem_request_info, 0},
	{"i915_gem_seqno", i915_gem_seqno_info, 0},
	{"i915_gem_fence_regs", i915_gem_fence_regs_info, 0},
	{"i915_gem_interrupt", i915_interrupt_info, 0},
	{"i915_gem_hws", i915_hws_info, 0},
	{"i915_ringbuffer_data", i915_ringbuffer_data, 0, (void *)RENDER_RING},
	{"i915_ringbuffer_info", i915_ringbuffer_info, 0, (void *)RENDER_RING},
	{"i915_bsd_ringbuffer_data", i915_ringbuffer_data, 0, (void *)BSD_RING},
	{"i915_bsd_ringbuffer_info", i915_ringbuffer_info, 0, (void *)BSD_RING},
	{"i915_blt_ringbuffer_data", i915_ringbuffer_data, 0, (void *)BLT_RING},
	{"i915_blt_ringbuffer_info", i915_ringbuffer_info, 0, (void *)BLT_RING},
	{"i915_batchbuffers", i915_batchbuffer_info, 0},
	{"i915_error_state", i915_error_state, 0},
	{"i915_rstdby_delays", i915_rstdby_delays, 0},
	{"i915_cur_delayinfo", i915_cur_delayinfo, 0},
	{"i915_delayfreq_table", i915_delayfreq_table, 0},
	{"i915_inttoext_table", i915_inttoext_table, 0},
	{"i915_drpc_info", i915_drpc_info, 0},
	{"i915_emon_status", i915_emon_status, 0},
	{"i915_gfxec", i915_gfxec, 0},
	{"i915_fbc_status", i915_fbc_status, 0},
	{"i915_sr_status", i915_sr_status, 0},
	{"i915_opregion", i915_opregion, 0},
	{"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},
};
#define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)

int i915_debugfs_init(struct drm_minor *minor)
{
	int ret;

	ret = i915_wedged_create(minor->debugfs_root, minor);
	if (ret)
		return ret;

	return drm_debugfs_create_files(i915_debugfs_list,
					I915_DEBUGFS_ENTRIES,
					minor->debugfs_root, minor);
}

void i915_debugfs_cleanup(struct drm_minor *minor)
{
	drm_debugfs_remove_files(i915_debugfs_list,
				 I915_DEBUGFS_ENTRIES, minor);
	drm_debugfs_remove_files((struct drm_info_list *) &i915_wedged_fops,
				 1, minor);
}

#endif /* CONFIG_DEBUG_FS */