text: /*
   * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
   * Copyright (C) 2013 Red Hat
   * Author: Rob Clark <robdclark@gmail.com>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  /*
   * Copyright (c) 2016 Intel Corporation
   *
   * Permission to use, copy, modify, distribute, and sell this software and its
   * documentation for any purpose is hereby granted without fee, provided that
   * the above copyright notice appear in all copies and that both that copyright
   * notice and this permission notice appear in supporting documentation, and
   * that the name of the copyright holders not be used in advertising or
   * publicity pertaining to distribution of the software without specific,
   * written prior permission. The copyright holders make no representations
   * about the suitability of this software for any purpose. It is provided "as
   * is" without express or implied warranty.
   *
   * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
   * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
   * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
   * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
   * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
   * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
   * OF THIS SOFTWARE.
   */
  
  #include <linux/of_address.h>
  #include <linux/kthread.h>
  #include <linux/workqueue.h>
  #include "msm_drv.h"
  #include "msm_debugfs.h"
  #include "msm_fence.h"
  #include "msm_gpu.h"
  #include "msm_kms.h"
  #include "sde_wb.h"
  #include "dsi_display.h"
  
  /*
   * MSM driver version:
   * - 1.0.0 - initial interface
   * - 1.1.0 - adds madvise, and support for submits with > 4 cmd buffers
   * - 1.2.0 - adds explicit fence support for submit ioctl
   */
  #define MSM_VERSION_MAJOR	1
  #define MSM_VERSION_MINOR	2
  #define MSM_VERSION_PATCHLEVEL	0
  
  static void msm_fb_output_poll_changed(struct drm_device *dev)
  {
  	struct msm_drm_private *priv = NULL;
  
  	if (!dev) {
  		DRM_ERROR("output_poll_changed failed, invalid input\n");
  		return;
  	}
  
  	priv = dev->dev_private;
  
  	if (priv->fbdev)
  		drm_fb_helper_hotplug_event(priv->fbdev);
  }
  
  /**
   * msm_atomic_helper_check - validate state object
   * @dev: DRM device
   * @state: the driver state object
   *
   * This is a wrapper for the drm_atomic_helper_check to check the modeset
   * and state checking for planes. Additionally it checks if any secure
   * transition(moving CRTC and planes between secure and non-secure states and
   * vice versa) is allowed or not. When going to secure state, planes
   * with fb_mode as dir translated only can be staged on the CRTC, and only one
   * CRTC should be active.
   * Also mixing of secure and non-secure is not allowed.
   *
   * RETURNS
   * Zero for success or -errorno.
   */
  int msm_atomic_check(struct drm_device *dev,
  			    struct drm_atomic_state *state)
  {
  	struct msm_drm_private *priv;
  
  	priv = dev->dev_private;
  	if (priv && priv->kms && priv->kms->funcs &&
  			priv->kms->funcs->atomic_check)
  		return priv->kms->funcs->atomic_check(priv->kms, state);
  
  	return drm_atomic_helper_check(dev, state);
  }
  
  static const struct drm_mode_config_funcs mode_config_funcs = {
  	.fb_create = msm_framebuffer_create,
  	.output_poll_changed = msm_fb_output_poll_changed,
  	.atomic_check = msm_atomic_check,
  	.atomic_commit = msm_atomic_commit,
  };
  
  #ifdef CONFIG_DRM_MSM_REGISTER_LOGGING
  static bool reglog = false;
  MODULE_PARM_DESC(reglog, "Enable register read/write logging");
  module_param(reglog, bool, 0600);
  #else
  #define reglog 0
  #endif
  
  #ifdef CONFIG_DRM_FBDEV_EMULATION
  static bool fbdev = true;
  MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
  module_param(fbdev, bool, 0600);
  #endif
  
  static char *vram = "16m";
  MODULE_PARM_DESC(vram, "Configure VRAM size (for devices without IOMMU/GPUMMU)");
  module_param(vram, charp, 0);
  
  /*
   * Util/helpers:
   */
  
  void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
  		const char *dbgname)
  {
  	struct resource *res;
  	unsigned long size;
  	void __iomem *ptr;
  
  	if (name)
  		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
  	else
  		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  
  	if (!res) {
  		dev_err(&pdev->dev, "failed to get memory resource: %s\n", name);
  		return ERR_PTR(-EINVAL);
  	}
  
  	size = resource_size(res);
  
  	ptr = devm_ioremap_nocache(&pdev->dev, res->start, size);
  	if (!ptr) {
  		dev_err(&pdev->dev, "failed to ioremap: %s\n", name);
  		return ERR_PTR(-ENOMEM);
  	}
  
  	if (reglog)
  		dev_dbg(&pdev->dev, "IO:region %s %pK %08lx\n",
  			dbgname, ptr, size);
  
  	return ptr;
  }
  
  unsigned long msm_iomap_size(struct platform_device *pdev, const char *name)
  {
  	struct resource *res;
  
  	if (name)
  		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
  	else
  		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  
  	if (!res) {
  		dev_err(&pdev->dev, "failed to get memory resource: %s\n",
  									name);
  		return 0;
  	}
  
  	return resource_size(res);
  }
  
  void msm_iounmap(struct platform_device *pdev, void __iomem *addr)
  {
  	devm_iounmap(&pdev->dev, addr);
  }
  
  void msm_writel(u32 data, void __iomem *addr)
  {
  	if (reglog)
  		pr_debug("IO:W %pK %08x\n", addr, data);
  	writel(data, addr);
  }
  
  u32 msm_readl(const void __iomem *addr)
  {
  	u32 val = readl(addr);
  
  	if (reglog)
  		pr_err("IO:R %pK %08x\n", addr, val);
  	return val;
  }
  
  struct vblank_work {
  	struct kthread_work work;
  	int crtc_id;
  	bool enable;
  	struct msm_drm_private *priv;
  };
  
  static void vblank_ctrl_worker(struct kthread_work *work)
  {
  	struct vblank_work *cur_work = container_of(work,
  					struct vblank_work, work);
  	struct msm_drm_private *priv = cur_work->priv;
  	struct msm_kms *kms = priv->kms;
  
  	if (cur_work->enable)
  		kms->funcs->enable_vblank(kms, priv->crtcs[cur_work->crtc_id]);
  	else
  		kms->funcs->disable_vblank(kms, priv->crtcs[cur_work->crtc_id]);
  
  	kfree(cur_work);
  }
  
  static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
  					int crtc_id, bool enable)
  {
  	struct vblank_work *cur_work;
  
  	if (!priv || crtc_id >= priv->num_crtcs)
  		return -EINVAL;
  
  	cur_work = kzalloc(sizeof(*cur_work), GFP_ATOMIC);
  	if (!cur_work)
  		return -ENOMEM;
  
  	kthread_init_work(&cur_work->work, vblank_ctrl_worker);
  	cur_work->crtc_id = crtc_id;
  	cur_work->enable = enable;
  	cur_work->priv = priv;
  
  	kthread_queue_work(&priv->disp_thread[crtc_id].worker, &cur_work->work);
  
  	return 0;
  }
  
  static int msm_drm_uninit(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	struct drm_device *ddev = platform_get_drvdata(pdev);
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_kms *kms = priv->kms;
  	struct msm_gpu *gpu = priv->gpu;
  	int i;
  
  	/* clean up display commit/event worker threads */
  	for (i = 0; i < priv->num_crtcs; i++) {
  		if (priv->disp_thread[i].thread) {
  			kthread_flush_worker(&priv->disp_thread[i].worker);
  			kthread_stop(priv->disp_thread[i].thread);
  			priv->disp_thread[i].thread = NULL;
  		}
  
  		if (priv->event_thread[i].thread) {
  			kthread_flush_worker(&priv->event_thread[i].worker);
  			kthread_stop(priv->event_thread[i].thread);
  			priv->event_thread[i].thread = NULL;
  		}
  	}
  
  	msm_gem_shrinker_cleanup(ddev);
  
  	drm_kms_helper_poll_fini(ddev);
  
  	drm_mode_config_cleanup(ddev);
  	drm_vblank_cleanup(ddev);
  
  	if (priv->registered) {
  		drm_dev_unregister(ddev);
  		priv->registered = false;
  	}
  
  #ifdef CONFIG_DRM_FBDEV_EMULATION
  	if (fbdev && priv->fbdev)
  		msm_fbdev_free(ddev);
  #endif
  	drm_mode_config_cleanup(ddev);
  
  	pm_runtime_get_sync(dev);
  	drm_irq_uninstall(ddev);
  	pm_runtime_put_sync(dev);
  
  	flush_workqueue(priv->wq);
  	destroy_workqueue(priv->wq);
  
  	if (kms && kms->funcs)
  		kms->funcs->destroy(kms);
  
  	if (gpu) {
  		mutex_lock(&ddev->struct_mutex);
  		gpu->funcs->pm_suspend(gpu);
  		mutex_unlock(&ddev->struct_mutex);
  		gpu->funcs->destroy(gpu);
  	}
  
  	if (priv->vram.paddr) {
  		unsigned long attrs = DMA_ATTR_NO_KERNEL_MAPPING;
  
  		drm_mm_takedown(&priv->vram.mm);
  		dma_free_attrs(dev, priv->vram.size, NULL,
  			       priv->vram.paddr, attrs);
  	}
  
  	component_unbind_all(dev, ddev);
  
  	sde_dbg_destroy();
  	debugfs_remove_recursive(priv->debug_root);
  
  	sde_power_client_destroy(&priv->phandle, priv->pclient);
  	sde_power_resource_deinit(pdev, &priv->phandle);
  
  	msm_mdss_destroy(ddev);
  
  	ddev->dev_private = NULL;
  	kfree(priv);
  
  	drm_dev_unref(ddev);
  
  	return 0;
  }
  
  #define KMS_MDP4 4
  #define KMS_MDP5 5
  #define KMS_SDE  3
  
  static int get_mdp_ver(struct platform_device *pdev)
  {
  #ifdef CONFIG_OF
  	static const struct of_device_id match_types[] = { {
  		.compatible = "qcom,mdss_mdp",
  		.data	= (void	*)KMS_MDP5,
  	},
  	{
  		.compatible = "qcom,sde-kms",
  		.data	= (void	*)KMS_SDE,
  	},
  	{} };
  	struct device *dev = &pdev->dev;
  	const struct of_device_id *match;
  
  	match = of_match_node(match_types, dev->of_node);
  	if (match)
  		return (int)(unsigned long)match->data;
  #endif
  	return KMS_MDP4;
  }
  
  static int msm_init_vram(struct drm_device *dev)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct device_node *node;
  	unsigned long size = 0;
  	int ret = 0;
  
  	/* In the device-tree world, we could have a 'memory-region'
  	 * phandle, which gives us a link to our "vram".  Allocating
  	 * is all nicely abstracted behind the dma api, but we need
  	 * to know the entire size to allocate it all in one go. There
  	 * are two cases:
  	 *  1) device with no IOMMU, in which case we need exclusive
  	 *     access to a VRAM carveout big enough for all gpu
  	 *     buffers
  	 *  2) device with IOMMU, but where the bootloader puts up
  	 *     a splash screen.  In this case, the VRAM carveout
  	 *     need only be large enough for fbdev fb.  But we need
  	 *     exclusive access to the buffer to avoid the kernel
  	 *     using those pages for other purposes (which appears
  	 *     as corruption on screen before we have a chance to
  	 *     load and do initial modeset)
  	 */
  
  	node = of_parse_phandle(dev->dev->of_node, "memory-region", 0);
  	if (node) {
  		struct resource r;
  
  		ret = of_address_to_resource(node, 0, &r);
  
  		of_node_put(node);
  		if (ret)
  			return ret;
  		size = r.end - r.start;
  		DRM_INFO("using VRAM carveout: %lx@%pa\n", size, &r.start);
  
  		/* if we have no IOMMU, then we need to use carveout allocator.
  		 * Grab the entire CMA chunk carved out in early startup in
  		 * mach-msm:
  		 */
  	} else if (!iommu_present(&platform_bus_type)) {
  		DRM_INFO("using %s VRAM carveout\n", vram);
  		size = memparse(vram, NULL);
  	}
  
  	if (size) {
  		unsigned long attrs = 0;
  		void *p;
  
  		priv->vram.size = size;
  
  		drm_mm_init(&priv->vram.mm, 0, (size >> PAGE_SHIFT) - 1);
  
  		attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
  		attrs |= DMA_ATTR_WRITE_COMBINE;
  
  		/* note that for no-kernel-mapping, the vaddr returned
  		 * is bogus, but non-null if allocation succeeded:
  		 */
  		p = dma_alloc_attrs(dev->dev, size,
  				&priv->vram.paddr, GFP_KERNEL, attrs);
  		if (!p) {
  			dev_err(dev->dev, "failed to allocate VRAM\n");
  			priv->vram.paddr = 0;
  			return -ENOMEM;
  		}
  
  		dev_info(dev->dev, "VRAM: %08x->%08x\n",
  				(uint32_t)priv->vram.paddr,
  				(uint32_t)(priv->vram.paddr + size));
  	}
  
  	return ret;
  }
  
  #ifdef CONFIG_OF
  static int msm_component_bind_all(struct device *dev,
  				struct drm_device *drm_dev)
  {
  	int ret;
  
  	ret = component_bind_all(dev, drm_dev);
  	if (ret)
  		DRM_ERROR("component_bind_all failed: %d\n", ret);
  
  	return ret;
  }
  #else
  static int msm_component_bind_all(struct device *dev,
  				struct drm_device *drm_dev)
  {
  	return 0;
  }
  #endif
  
  static int msm_power_enable_wrapper(void *handle, void *client, bool enable)
  {
  	return sde_power_resource_enable(handle, client, enable);
  }
  
  static ssize_t idle_encoder_mask_store(struct device *device,
  			       struct device_attribute *attr,
  			       const char *buf, size_t count)
  {
  	struct drm_device *ddev = dev_get_drvdata(device);
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_idle *idle = &priv->idle;
  	u32 encoder_mask = 0;
  	int rc;
  	unsigned long flags;
  
  	rc = kstrtouint(buf, 10, &encoder_mask);
  	if (rc)
  		return rc;
  
  	spin_lock_irqsave(&idle->lock, flags);
  	idle->encoder_mask = encoder_mask;
  	idle->active_mask &= encoder_mask;
  	spin_unlock_irqrestore(&idle->lock, flags);
  
  	return count;
  }
  
  static ssize_t idle_encoder_mask_show(struct device *device,
  			      struct device_attribute *attr,
  			      char *buf)
  {
  	struct drm_device *ddev = dev_get_drvdata(device);
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_idle *idle = &priv->idle;
  
  	return snprintf(buf, PAGE_SIZE, "0x%x\n", idle->encoder_mask);
  }
  
  static ssize_t idle_timeout_ms_store(struct device *device,
  			       struct device_attribute *attr,
  			       const char *buf, size_t count)
  {
  	struct drm_device *ddev = dev_get_drvdata(device);
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_idle *idle = &priv->idle;
  	u32 timeout_ms = 0;
  	int rc;
  	unsigned long flags;
  
  	rc = kstrtouint(buf, 10, &timeout_ms);
  	if (rc)
  		return rc;
  
  	spin_lock_irqsave(&idle->lock, flags);
  	idle->timeout_ms = timeout_ms;
  	spin_unlock_irqrestore(&idle->lock, flags);
  
  	return count;
  }
  
  static ssize_t idle_timeout_ms_show(struct device *device,
  			      struct device_attribute *attr,
  			      char *buf)
  {
  	struct drm_device *ddev = dev_get_drvdata(device);
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_idle *idle = &priv->idle;
  
  	return scnprintf(buf, PAGE_SIZE, "%d\n", idle->timeout_ms);
  }
  
  static ssize_t idle_state_show(struct device *device,
  			      struct device_attribute *attr,
  			      char *buf)
  {
  	struct drm_device *ddev = dev_get_drvdata(device);
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_idle *idle = &priv->idle;
  	const char *state;
  	unsigned long flags;
  
  	spin_lock_irqsave(&idle->lock, flags);
  	if (idle->active_mask) {
  		state = "active";
  		spin_unlock_irqrestore(&idle->lock, flags);
  		return scnprintf(buf, PAGE_SIZE, "%s (0x%x)\n",
  				 state, idle->active_mask);
  	} else if (delayed_work_pending(&idle->work))
  		state = "pending";
  	else
  		state = "idle";
  	spin_unlock_irqrestore(&idle->lock, flags);
  
  	return scnprintf(buf, PAGE_SIZE, "%s\n", state);
  }
  
  static DEVICE_ATTR_RW(idle_encoder_mask);
  static DEVICE_ATTR_RW(idle_timeout_ms);
  static DEVICE_ATTR_RO(idle_state);
  
  static const struct attribute *msm_idle_attrs[] = {
  	&dev_attr_idle_encoder_mask.attr,
  	&dev_attr_idle_timeout_ms.attr,
  	&dev_attr_idle_state.attr,
  	NULL
  };
  
  static void msm_idle_work(struct work_struct *work)
  {
  	struct delayed_work *dw = to_delayed_work(work);
  	struct msm_idle *idle = container_of(dw, struct msm_idle, work);
  	struct msm_drm_private *priv = container_of(idle,
  					struct msm_drm_private, idle);
  
  	if (!idle->active_mask)
  		sysfs_notify(&priv->dev->dev->kobj, NULL, "idle_state");
  }
  
  void msm_idle_set_state(struct drm_encoder *encoder, bool active)
  {
  	struct drm_device *ddev = encoder->dev;
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_idle *idle = &priv->idle;
  	unsigned int mask = 1 << drm_encoder_index(encoder);
  	unsigned long flags;
  
  	spin_lock_irqsave(&idle->lock, flags);
  	if (mask & idle->encoder_mask) {
  		if (active)
  			idle->active_mask |= mask;
  		else
  			idle->active_mask &= ~mask;
  
  		if (idle->timeout_ms && !idle->active_mask)
  			mod_delayed_work(system_wq, &idle->work,
  					 msecs_to_jiffies(idle->timeout_ms));
  		else
  			cancel_delayed_work(&idle->work);
  	}
  	spin_unlock_irqrestore(&idle->lock, flags);
  }
  
  static void msm_idle_init(struct drm_device *ddev)
  {
  	struct msm_drm_private *priv = ddev->dev_private;
  	struct msm_idle *idle = &priv->idle;
  
  	if (sysfs_create_files(&ddev->dev->kobj, msm_idle_attrs) < 0)
  		pr_warn("failed to create idle state file");
  
  	INIT_DELAYED_WORK(&idle->work, msm_idle_work);
  	spin_lock_init(&idle->lock);
  }
  
  static int msm_drm_init(struct device *dev, struct drm_driver *drv)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	struct drm_device *ddev;
  	struct msm_drm_private *priv;
  	struct msm_kms *kms;
  	struct sde_dbg_power_ctrl dbg_power_ctrl = { 0 };
  	int ret, i;
  	struct sched_param param;
  
  	ddev = drm_dev_alloc(drv, dev);
  	if (!ddev) {
  		dev_err(dev, "failed to allocate drm_device\n");
  		return -ENOMEM;
  	}
  
  	drm_mode_config_init(ddev);
  	platform_set_drvdata(pdev, ddev);
  	ddev->platformdev = pdev;
  
  	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  	if (!priv) {
  		ret = -ENOMEM;
  		goto priv_alloc_fail;
  	}
  
  	ddev->dev_private = priv;
  	priv->dev = ddev;
  
  	ret = msm_mdss_init(ddev);
  	if (ret)
  		goto mdss_init_fail;
  
  	priv->wq = alloc_ordered_workqueue("msm_drm", 0);
  	init_waitqueue_head(&priv->pending_crtcs_event);
  
  	INIT_LIST_HEAD(&priv->client_event_list);
  	INIT_LIST_HEAD(&priv->inactive_list);
  
  	ret = sde_power_resource_init(pdev, &priv->phandle);
  	if (ret) {
  		pr_err("sde power resource init failed\n");
  		goto power_init_fail;
  	}
  
  	priv->pclient = sde_power_client_create(&priv->phandle, "sde");
  	if (IS_ERR_OR_NULL(priv->pclient)) {
  		pr_err("sde power client create failed\n");
  		ret = -EINVAL;
  		goto power_client_fail;
  	}
  
  	dbg_power_ctrl.handle = &priv->phandle;
  	dbg_power_ctrl.client = priv->pclient;
  	dbg_power_ctrl.enable_fn = msm_power_enable_wrapper;
  	ret = sde_dbg_init(&pdev->dev, &dbg_power_ctrl);
  	if (ret) {
  		dev_err(dev, "failed to init sde dbg: %d\n", ret);
  		goto dbg_init_fail;
  	}
  
  	msm_idle_init(ddev);
  
  	/* Bind all our sub-components: */
  	ret = msm_component_bind_all(dev, ddev);
  	if (ret)
  		goto bind_fail;
  
  	ret = msm_init_vram(ddev);
  	if (ret)
  		goto fail;
  
  	if (!dev->dma_parms) {
  		dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
  					      GFP_KERNEL);
  		if (!dev->dma_parms)
  			return -ENOMEM;
  	}
  	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
  
  	switch (get_mdp_ver(pdev)) {
  	case KMS_MDP4:
  		kms = mdp4_kms_init(ddev);
  		break;
  	case KMS_MDP5:
  		kms = mdp5_kms_init(ddev);
  		break;
  	case KMS_SDE:
  		kms = sde_kms_init(ddev);
  		break;
  	default:
  		kms = ERR_PTR(-ENODEV);
  		break;
  	}
  
  	if (IS_ERR(kms)) {
  		/*
  		 * NOTE: once we have GPU support, having no kms should not
  		 * be considered fatal.. ideally we would still support gpu
  		 * and (for example) use dmabuf/prime to share buffers with
  		 * imx drm driver on iMX5
  		 */
  		priv->kms = NULL;
  		dev_err(dev, "failed to load kms\n");
  		ret = PTR_ERR(kms);
  		goto fail;
  	}
  	priv->kms = kms;
  	pm_runtime_enable(dev);
  
  	if (kms) {
  		ret = kms->funcs->hw_init(kms);
  		if (ret) {
  			dev_err(dev, "kms hw init failed: %d\n", ret);
  			goto fail;
  		}
  	}
  	ddev->mode_config.funcs = &mode_config_funcs;
  
  	/**
  	 * this priority was found during empiric testing to have appropriate
  	 * realtime scheduling to process display updates and interact with
  	 * other real time and normal priority task
  	 */
  	param.sched_priority = 16;
  	for (i = 0; i < priv->num_crtcs; i++) {
  
  		/* initialize display thread */
  		priv->disp_thread[i].crtc_id = priv->crtcs[i]->base.id;
  		kthread_init_worker(&priv->disp_thread[i].worker);
  		priv->disp_thread[i].dev = ddev;
  		priv->disp_thread[i].thread =
  			kthread_run_perf_critical(kthread_worker_fn,
  				&priv->disp_thread[i].worker,
  				"crtc_commit:%d", priv->disp_thread[i].crtc_id);
  		ret = sched_setscheduler(priv->disp_thread[i].thread,
  							SCHED_FIFO, &param);
  		if (ret)
  			pr_warn("display thread priority update failed: %d\n",
  									ret);
  
  		if (IS_ERR(priv->disp_thread[i].thread)) {
  			dev_err(dev, "failed to create crtc_commit kthread\n");
  			priv->disp_thread[i].thread = NULL;
  		}
  
  		/* initialize event thread */
  		priv->event_thread[i].crtc_id = priv->crtcs[i]->base.id;
  		kthread_init_worker(&priv->event_thread[i].worker);
  		priv->event_thread[i].dev = ddev;
  		priv->event_thread[i].thread =
  			kthread_run_perf_critical(kthread_worker_fn,
  				&priv->event_thread[i].worker,
  				"crtc_event:%d", priv->event_thread[i].crtc_id);
  		/**
  		 * event thread should also run at same priority as disp_thread
  		 * because it is handling frame_done events. A lower priority
  		 * event thread and higher priority disp_thread can causes
  		 * frame_pending counters beyond 2. This can lead to commit
  		 * failure at crtc commit level.
  		 */
  		ret = sched_setscheduler(priv->event_thread[i].thread,
  							SCHED_FIFO, &param);
  		if (ret)
  			pr_warn("display event thread priority update failed: %d\n",
  									ret);
  
  		if (IS_ERR(priv->event_thread[i].thread)) {
  			dev_err(dev, "failed to create crtc_event kthread\n");
  			priv->event_thread[i].thread = NULL;
  		}
  
  		if ((!priv->disp_thread[i].thread) ||
  				!priv->event_thread[i].thread) {
  			/* clean up previously created threads if any */
  			for ( ; i >= 0; i--) {
  				if (priv->disp_thread[i].thread) {
  					kthread_stop(
  						priv->disp_thread[i].thread);
  					priv->disp_thread[i].thread = NULL;
  				}
  
  				if (priv->event_thread[i].thread) {
  					kthread_stop(
  						priv->event_thread[i].thread);
  					priv->event_thread[i].thread = NULL;
  				}
  			}
  			goto fail;
  		}
  	}
  
  	/**
  	 * Since pp interrupt is heavy weight, try to queue the work
  	 * into a dedicated worker thread, so that they dont interrupt
  	 * other important events.
  	 */
  	kthread_init_worker(&priv->pp_event_worker);
  	priv->pp_event_thread = kthread_run_perf_critical(kthread_worker_fn,
  			&priv->pp_event_worker, "pp_event");
  
  	ret = sched_setscheduler(priv->pp_event_thread,
  						SCHED_FIFO, &param);
  	if (ret)
  		pr_warn("pp_event thread priority update failed: %d\n",
  								ret);
  
  	if (IS_ERR(priv->pp_event_thread)) {
  		dev_err(dev, "failed to create pp_event kthread\n");
  		priv->pp_event_thread = NULL;
  		goto fail;
  	}
  
  	ret = drm_vblank_init(ddev, priv->num_crtcs);
  	if (ret < 0) {
  		dev_err(dev, "failed to initialize vblank\n");
  		goto fail;
  	}
  
  	if (kms) {
  		pm_runtime_get_sync(dev);
  		ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
  		pm_runtime_put_sync(dev);
  		if (ret < 0) {
  			dev_err(dev, "failed to install IRQ handler\n");
  			goto fail;
  		}
  	}
  
  	ret = drm_dev_register(ddev, 0);
  	if (ret)
  		goto fail;
  	priv->registered = true;
  
  	drm_mode_config_reset(ddev);
  
  	if (kms && kms->funcs && kms->funcs->cont_splash_config) {
  		ret = kms->funcs->cont_splash_config(kms);
  		if (ret) {
  			dev_err(dev, "kms cont_splash config failed.\n");
  			goto fail;
  		}
  	}
  
  #ifdef CONFIG_DRM_FBDEV_EMULATION
  	if (fbdev)
  		priv->fbdev = msm_fbdev_init(ddev);
  #endif
  
  	ret = msm_debugfs_late_init(ddev);
  	if (ret)
  		goto fail;
  
  	priv->debug_root = debugfs_create_dir("debug",
  					ddev->primary->debugfs_root);
  	if (IS_ERR_OR_NULL(priv->debug_root)) {
  		pr_err("debugfs_root create_dir fail, error %ld\n",
  		       PTR_ERR(priv->debug_root));
  		priv->debug_root = NULL;
  		goto fail;
  	}
  
  	ret = sde_dbg_debugfs_register(priv->debug_root);
  	if (ret) {
  		dev_err(dev, "failed to reg sde dbg debugfs: %d\n", ret);
  		goto fail;
  	}
  
  	/* perform subdriver post initialization */
  	if (kms && kms->funcs && kms->funcs->postinit) {
  		ret = kms->funcs->postinit(kms);
  		if (ret) {
  			pr_err("kms post init failed: %d\n", ret);
  			goto fail;
  		}
  	}
  
  	drm_kms_helper_poll_init(ddev);
  
  	return 0;
  
  fail:
  	msm_drm_uninit(dev);
  	return ret;
  bind_fail:
  	sde_dbg_destroy();
  dbg_init_fail:
  	sde_power_client_destroy(&priv->phandle, priv->pclient);
  power_client_fail:
  	sde_power_resource_deinit(pdev, &priv->phandle);
  power_init_fail:
  	msm_mdss_destroy(ddev);
  mdss_init_fail:
  	kfree(priv);
  priv_alloc_fail:
  	drm_dev_unref(ddev);
  	return ret;
  }
  
  /*
   * DRM operations:
   */
  
  #ifdef CONFIG_QCOM_KGSL
  static void load_gpu(struct drm_device *dev)
  {
  }
  #else
  static void load_gpu(struct drm_device *dev)
  {
  	static DEFINE_MUTEX(init_lock);
  	struct msm_drm_private *priv = dev->dev_private;
  
  	mutex_lock(&init_lock);
  
  	if (!priv->gpu)
  		priv->gpu = adreno_load_gpu(dev);
  
  	mutex_unlock(&init_lock);
  }
  #endif
  
  static int msm_open(struct drm_device *dev, struct drm_file *file)
  {
  	struct msm_file_private *ctx;
  
  	/* For now, load gpu on open.. to avoid the requirement of having
  	 * firmware in the initrd.
  	 */
  	load_gpu(dev);
  
  	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
  	if (!ctx)
  		return -ENOMEM;
  
  	file->driver_priv = ctx;
  
  	if (dev && dev->dev_private) {
  		struct msm_drm_private *priv = dev->dev_private;
  		struct msm_kms *kms;
  
  		kms = priv->kms;
  		if (kms && kms->funcs && kms->funcs->postopen)
  			kms->funcs->postopen(kms, file);
  	}
  	return 0;
  }
  
  static void msm_preclose(struct drm_device *dev, struct drm_file *file)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	if (kms && kms->funcs && kms->funcs->preclose)
  		kms->funcs->preclose(kms, file);
  }
  
  static void msm_postclose(struct drm_device *dev, struct drm_file *file)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_file_private *ctx = file->driver_priv;
  	struct msm_kms *kms = priv->kms;
  
  	if (kms && kms->funcs && kms->funcs->postclose)
  		kms->funcs->postclose(kms, file);
  
  	mutex_lock(&dev->struct_mutex);
  	if (ctx == priv->lastctx)
  		priv->lastctx = NULL;
  	mutex_unlock(&dev->struct_mutex);
  
  	kfree(ctx);
  }
  
  static int msm_disable_all_modes_commit(
  		struct drm_device *dev,
  		struct drm_atomic_state *state)
  {
  	struct drm_plane *plane;
  	struct drm_crtc *crtc;
  	unsigned int plane_mask;
  	int ret;
  
  	plane_mask = 0;
  	drm_for_each_plane(plane, dev) {
  		struct drm_plane_state *plane_state;
  
  		plane_state = drm_atomic_get_plane_state(state, plane);
  		if (IS_ERR(plane_state)) {
  			ret = PTR_ERR(plane_state);
  			goto fail;
  		}
  
  		plane_state->rotation = 0;
  
  		plane->old_fb = plane->fb;
  		plane_mask |= 1 << drm_plane_index(plane);
  
  		/* disable non-primary: */
  		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
  			continue;
  
  		DRM_DEBUG("disabling plane %d\n", plane->base.id);
  
  		ret = __drm_atomic_helper_disable_plane(plane, plane_state);
  		if (ret != 0)
  			DRM_ERROR("error %d disabling plane %d\n", ret,
  					plane->base.id);
  	}
  
  	drm_for_each_crtc(crtc, dev) {
  		struct drm_mode_set mode_set;
  
  		memset(&mode_set, 0, sizeof(struct drm_mode_set));
  		mode_set.crtc = crtc;
  
  		DRM_DEBUG("disabling crtc %d\n", crtc->base.id);
  
  		ret = __drm_atomic_helper_set_config(&mode_set, state);
  		if (ret != 0)
  			DRM_ERROR("error %d disabling crtc %d\n", ret,
  					crtc->base.id);
  	}
  
  	DRM_DEBUG("committing disables\n");
  	ret = drm_atomic_commit(state);
  
  fail:
  	drm_atomic_clean_old_fb(dev, plane_mask, ret);
  	DRM_DEBUG("disables result %d\n", ret);
  	return ret;
  }
  
  /**
   * msm_clear_all_modes - disables all planes and crtcs via an atomic commit
   *	based on restore_fbdev_mode_atomic in drm_fb_helper.c
   * @dev: device pointer
   * @Return: 0 on success, otherwise -error
   */
  static int msm_disable_all_modes(struct drm_device *dev)
  {
  	struct drm_atomic_state *state;
  	int ret, i;
  
  	state = drm_atomic_state_alloc(dev);
  	if (!state)
  		return -ENOMEM;
  
  	state->acquire_ctx = dev->mode_config.acquire_ctx;
  
  	for (i = 0; i < TEARDOWN_DEADLOCK_RETRY_MAX; i++) {
  		ret = msm_disable_all_modes_commit(dev, state);
  		if (ret != -EDEADLK)
  			break;
  		drm_atomic_state_clear(state);
  		drm_atomic_legacy_backoff(state);
  	}
  
  	/* on successful atomic commit state ownership transfers to framework */
  	if (ret != 0)
  		drm_atomic_state_free(state);
  
  	return ret;
  }
  
  static void msm_lastclose(struct drm_device *dev)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  	int i;
  
  	/* check for splash status before triggering cleanup
  	 * if we end up here with splash status ON i.e before first
  	 * commit then ignore the last close call
  	 */
  	if (kms && kms->funcs && kms->funcs->check_for_splash
  		&& kms->funcs->check_for_splash(kms))
  		return;
  
  	/*
  	 * clean up vblank disable immediately as this is the last close.
  	 */
  	for (i = 0; i < dev->num_crtcs; i++) {
  		struct drm_vblank_crtc *vblank = &dev->vblank[i];
  		struct timer_list *disable_timer = &vblank->disable_timer;
  
  		if (del_timer_sync(disable_timer))
  			disable_timer->function(disable_timer->data);
  	}
  
  	/* wait for pending vblank requests to be executed by worker thread */
  	flush_workqueue(priv->wq);
  
  	if (priv->fbdev) {
  		drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
  	} else {
  		drm_modeset_lock_all(dev);
  		msm_disable_all_modes(dev);
  		if (kms && kms->funcs && kms->funcs->lastclose)
  			kms->funcs->lastclose(kms);
  		drm_modeset_unlock_all(dev);
  	}
  }
  
  static irqreturn_t msm_irq(int irq, void *arg)
  {
  	struct drm_device *dev = arg;
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	BUG_ON(!kms);
  	return kms->funcs->irq(kms);
  }
  
  static void msm_irq_preinstall(struct drm_device *dev)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	BUG_ON(!kms);
  	kms->funcs->irq_preinstall(kms);
  }
  
  static int msm_irq_postinstall(struct drm_device *dev)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	BUG_ON(!kms);
  	return kms->funcs->irq_postinstall(kms);
  }
  
  static void msm_irq_uninstall(struct drm_device *dev)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	BUG_ON(!kms);
  	kms->funcs->irq_uninstall(kms);
  }
  
  static int msm_enable_vblank(struct drm_device *dev, unsigned int pipe)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	if (!kms)
  		return -ENXIO;
  	DBG("dev=%pK, crtc=%u", dev, pipe);
  	return vblank_ctrl_queue_work(priv, pipe, true);
  }
  
  static void msm_disable_vblank(struct drm_device *dev, unsigned int pipe)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	if (!kms)
  		return;
  	DBG("dev=%pK, crtc=%u", dev, pipe);
  	vblank_ctrl_queue_work(priv, pipe, false);
  }
  
  /*
   * DRM ioctls:
   */
  
  static int msm_ioctl_get_param(struct drm_device *dev, void *data,
  		struct drm_file *file)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct drm_msm_param *args = data;
  	struct msm_gpu *gpu;
  
  	/* for now, we just have 3d pipe.. eventually this would need to
  	 * be more clever to dispatch to appropriate gpu module:
  	 */
  	if (args->pipe != MSM_PIPE_3D0)
  		return -EINVAL;
  
  	gpu = priv->gpu;
  
  	if (!gpu)
  		return -ENXIO;
  
  	return gpu->funcs->get_param(gpu, args->param, &args->value);
  }
  
  static int msm_ioctl_gem_new(struct drm_device *dev, void *data,
  		struct drm_file *file)
  {
  	struct drm_msm_gem_new *args = data;
  
  	if (args->flags & ~MSM_BO_FLAGS) {
  		DRM_ERROR("invalid flags: %08x\n", args->flags);
  		return -EINVAL;
  	}
  
  	return msm_gem_new_handle(dev, file, args->size,
  			args->flags, &args->handle);
  }
  
  static inline ktime_t to_ktime(struct drm_msm_timespec timeout)
  {
  	return ktime_set(timeout.tv_sec, timeout.tv_nsec);
  }
  
  static int msm_ioctl_gem_cpu_prep(struct drm_device *dev, void *data,
  		struct drm_file *file)
  {
  	struct drm_msm_gem_cpu_prep *args = data;
  	struct drm_gem_object *obj;
  	ktime_t timeout = to_ktime(args->timeout);
  	int ret;
  
  	if (args->op & ~MSM_PREP_FLAGS) {
  		DRM_ERROR("invalid op: %08x\n", args->op);
  		return -EINVAL;
  	}
  
  	obj = drm_gem_object_lookup(file, args->handle);
  	if (!obj)
  		return -ENOENT;
  
  	ret = msm_gem_cpu_prep(obj, args->op, &timeout);
  
  	drm_gem_object_unreference_unlocked(obj);
  
  	return ret;
  }
  
  static int msm_ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
  		struct drm_file *file)
  {
  	struct drm_msm_gem_cpu_fini *args = data;
  	struct drm_gem_object *obj;
  	int ret;
  
  	obj = drm_gem_object_lookup(file, args->handle);
  	if (!obj)
  		return -ENOENT;
  
  	ret = msm_gem_cpu_fini(obj);
  
  	drm_gem_object_unreference_unlocked(obj);
  
  	return ret;
  }
  
  static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
  		struct drm_file *file)
  {
  	struct drm_msm_gem_info *args = data;
  	struct drm_gem_object *obj;
  	int ret = 0;
  
  	if (args->pad)
  		return -EINVAL;
  
  	obj = drm_gem_object_lookup(file, args->handle);
  	if (!obj)
  		return -ENOENT;
  
  	args->offset = msm_gem_mmap_offset(obj);
  
  	drm_gem_object_unreference_unlocked(obj);
  
  	return ret;
  }
  
  static int msm_ioctl_wait_fence(struct drm_device *dev, void *data,
  		struct drm_file *file)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct drm_msm_wait_fence *args = data;
  	ktime_t timeout = to_ktime(args->timeout);
  
  	if (args->pad) {
  		DRM_ERROR("invalid pad: %08x\n", args->pad);
  		return -EINVAL;
  	}
  
  	if (!priv->gpu)
  		return 0;
  
  	return msm_wait_fence(priv->gpu->fctx, args->fence, &timeout, true);
  }
  
  static int msm_ioctl_gem_madvise(struct drm_device *dev, void *data,
  		struct drm_file *file)
  {
  	struct drm_msm_gem_madvise *args = data;
  	struct drm_gem_object *obj;
  	int ret;
  
  	switch (args->madv) {
  	case MSM_MADV_DONTNEED:
  	case MSM_MADV_WILLNEED:
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	ret = mutex_lock_interruptible(&dev->struct_mutex);
  	if (ret)
  		return ret;
  
  	obj = drm_gem_object_lookup(file, args->handle);
  	if (!obj) {
  		ret = -ENOENT;
  		goto unlock;
  	}
  
  	ret = msm_gem_madvise(obj, args->madv);
  	if (ret >= 0) {
  		args->retained = ret;
  		ret = 0;
  	}
  
  	drm_gem_object_unreference(obj);
  
  unlock:
  	mutex_unlock(&dev->struct_mutex);
  	return ret;
  }
  
  static int msm_drm_object_supports_event(struct drm_device *dev,
  		struct drm_msm_event_req *req)
  {
  	int ret = -EINVAL;
  	struct drm_mode_object *arg_obj;
  
  	arg_obj = drm_mode_object_find(dev, req->object_id, req->object_type);
  	if (!arg_obj)
  		return -ENOENT;
  
  	switch (arg_obj->type) {
  	case DRM_MODE_OBJECT_CRTC:
  	case DRM_MODE_OBJECT_CONNECTOR:
  		ret = 0;
  		break;
  	default:
  		ret = -EOPNOTSUPP;
  		break;
  	}
  
  	drm_mode_object_unreference(arg_obj);
  
  	return ret;
  }
  
  static int msm_register_event(struct drm_device *dev,
  	struct drm_msm_event_req *req, struct drm_file *file, bool en)
  {
  	int ret = -EINVAL;
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  	struct drm_mode_object *arg_obj;
  
  	arg_obj = drm_mode_object_find(dev, req->object_id, req->object_type);
  	if (!arg_obj)
  		return -ENOENT;
  
  	ret = kms->funcs->register_events(kms, arg_obj, req->event, en);
  
  	drm_mode_object_unreference(arg_obj);
  
  	return ret;
  }
  
  static int msm_event_client_count(struct drm_device *dev,
  		struct drm_msm_event_req *req_event, bool locked)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	unsigned long flag = 0;
  	struct msm_drm_event *node;
  	int count = 0;
  
  	if (!locked)
  		spin_lock_irqsave(&dev->event_lock, flag);
  	list_for_each_entry(node, &priv->client_event_list, base.link) {
  		if (node->event.type == req_event->event &&
  			node->info.object_id == req_event->object_id)
  			count++;
  	}
  	if (!locked)
  		spin_unlock_irqrestore(&dev->event_lock, flag);
  
  	return count;
  }
  
  static int msm_ioctl_register_event(struct drm_device *dev, void *data,
  				    struct drm_file *file)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct drm_msm_event_req *req_event = data;
  	struct msm_drm_event *client, *node;
  	unsigned long flag = 0;
  	bool dup_request = false;
  	int ret = 0, count = 0;
  
  	ret = msm_drm_object_supports_event(dev, req_event);
  	if (ret) {
  		DRM_ERROR("unsupported event %x object %x object id %d\n",
  			req_event->event, req_event->object_type,
  			req_event->object_id);
  		return ret;
  	}
  
  	spin_lock_irqsave(&dev->event_lock, flag);
  	list_for_each_entry(node, &priv->client_event_list, base.link) {
  		if (node->base.file_priv != file)
  			continue;
  		if (node->event.type == req_event->event &&
  			node->info.object_id == req_event->object_id) {
  			DRM_DEBUG("duplicate request for event %x obj id %d\n",
  				node->event.type, node->info.object_id);
  			dup_request = true;
  			break;
  		}
  	}
  	spin_unlock_irqrestore(&dev->event_lock, flag);
  
  	if (dup_request)
  		return -EALREADY;
  
  	client = kzalloc(sizeof(*client), GFP_KERNEL);
  	if (!client)
  		return -ENOMEM;
  
  	client->base.file_priv = file;
  	client->base.pid = current->pid;
  	client->base.event = &client->event;
  	client->event.type = req_event->event;
  	memcpy(&client->info, req_event, sizeof(client->info));
  
  	/* Get the count of clients that have registered for event.
  	 * Event should be enabled for first client, for subsequent enable
  	 * calls add to client list and return.
  	 */
  	count = msm_event_client_count(dev, req_event, false);
  	/* Add current client to list */
  	spin_lock_irqsave(&dev->event_lock, flag);
  	list_add_tail(&client->base.link, &priv->client_event_list);
  	spin_unlock_irqrestore(&dev->event_lock, flag);
  
  	if (count)
  		return 0;
  
  	ret = msm_register_event(dev, req_event, file, true);
  	if (ret) {
  		DRM_ERROR("failed to enable event %x object %x object id %d\n",
  			req_event->event, req_event->object_type,
  			req_event->object_id);
  		spin_lock_irqsave(&dev->event_lock, flag);
  		list_del(&client->base.link);
  		spin_unlock_irqrestore(&dev->event_lock, flag);
  		kfree(client);
  	}
  	return ret;
  }
  
  static int msm_ioctl_deregister_event(struct drm_device *dev, void *data,
  				      struct drm_file *file)
  {
  	struct msm_drm_private *priv = dev->dev_private;
  	struct drm_msm_event_req *req_event = data;
  	struct msm_drm_event *client = NULL, *node, *temp;
  	unsigned long flag = 0;
  	int count = 0;
  	bool found = false;
  	int ret = 0;
  
  	ret = msm_drm_object_supports_event(dev, req_event);
  	if (ret) {
  		DRM_ERROR("unsupported event %x object %x object id %d\n",
  			req_event->event, req_event->object_type,
  			req_event->object_id);
  		return ret;
  	}
  
  	spin_lock_irqsave(&dev->event_lock, flag);
  	list_for_each_entry_safe(node, temp, &priv->client_event_list,
  			base.link) {
  		if (node->event.type == req_event->event &&
  		    node->info.object_id == req_event->object_id &&
  		    node->base.file_priv == file) {
  			client = node;
  			list_del(&client->base.link);
  			found = true;
  			kfree(client);
  			break;
  		}
  	}
  	spin_unlock_irqrestore(&dev->event_lock, flag);
  
  	if (!found)
  		return -ENOENT;
  
  	count = msm_event_client_count(dev, req_event, false);
  	if (!count)
  		ret = msm_register_event(dev, req_event, file, false);
  
  	return ret;
  }
  
  void msm_mode_object_event_notify(struct drm_mode_object *obj,
  		struct drm_device *dev, struct drm_event *event, u8 *payload)
  {
  	struct msm_drm_private *priv = NULL;
  	unsigned long flags;
  	struct msm_drm_event *notify, *node;
  	int len = 0, ret;
  
  	if (!obj || !event || !event->length || !payload) {
  		DRM_ERROR("err param obj %pK event %pK len %d payload %pK\n",
  			obj, event, ((event) ? (event->length) : -1),
  			payload);
  		return;
  	}
  	priv = (dev) ? dev->dev_private : NULL;
  	if (!dev || !priv) {
  		DRM_ERROR("invalid dev %pK priv %pK\n", dev, priv);
  		return;
  	}
  
  	spin_lock_irqsave(&dev->event_lock, flags);
  	list_for_each_entry(node, &priv->client_event_list, base.link) {
  		if (node->event.type != event->type ||
  			obj->id != node->info.object_id)
  			continue;
  		len = event->length + sizeof(struct msm_drm_event);
  		if (node->base.file_priv->event_space < len) {
  			DRM_ERROR("Insufficient space %d for event %x len %d\n",
  				node->base.file_priv->event_space, event->type,
  				len);
  			continue;
  		}
  		notify = kzalloc(len, GFP_ATOMIC);
  		if (!notify)
  			continue;
  		notify->base.file_priv = node->base.file_priv;
  		notify->base.event = &notify->event;
  		notify->base.pid = node->base.pid;
  		notify->event.type = node->event.type;
  		notify->event.length = event->length +
  					sizeof(struct drm_msm_event_resp);
  		memcpy(&notify->info, &node->info, sizeof(notify->info));
  		memcpy(notify->data, payload, event->length);
  		ret = drm_event_reserve_init_locked(dev, node->base.file_priv,
  			&notify->base, &notify->event);
  		if (ret) {
  			kfree(notify);
  			continue;
  		}
  		drm_send_event_locked(dev, &notify->base);
  	}
  	spin_unlock_irqrestore(&dev->event_lock, flags);
  }
  
  static int msm_release(struct inode *inode, struct file *filp)
  {
  	struct drm_file *file_priv = filp->private_data;
  	struct drm_minor *minor = file_priv->minor;
  	struct drm_device *dev = minor->dev;
  	struct msm_drm_private *priv = dev->dev_private;
  	struct msm_drm_event *node, *temp, *tmp_node;
  	u32 count;
  	unsigned long flags;
  	LIST_HEAD(tmp_head);
  
  	spin_lock_irqsave(&dev->event_lock, flags);
  	list_for_each_entry_safe(node, temp, &priv->client_event_list,
  			base.link) {
  		if (node->base.file_priv != file_priv)
  			continue;
  		list_del(&node->base.link);
  		list_add_tail(&node->base.link, &tmp_head);
  	}
  	spin_unlock_irqrestore(&dev->event_lock, flags);
  
  	list_for_each_entry_safe(node, temp, &tmp_head,
  			base.link) {
  		list_del(&node->base.link);
  		count = msm_event_client_count(dev, &node->info, false);
  
  		list_for_each_entry(tmp_node, &tmp_head, base.link) {
  			if (tmp_node->event.type == node->info.event &&
  				tmp_node->info.object_id ==
  					node->info.object_id)
  				count++;
  		}
  		if (!count)
  			msm_register_event(dev, &node->info, file_priv, false);
  		kfree(node);
  	}
  
  	return drm_release(inode, filp);
  }
  
  /**
   * msm_ioctl_rmfb2 - remove an FB from the configuration
   * @dev: drm device for the ioctl
   * @data: data pointer for the ioctl
   * @file_priv: drm file for the ioctl call
   *
   * Remove the FB specified by the user.
   *
   * Called by the user via ioctl.
   *
   * Returns:
   * Zero on success, negative errno on failure.
   */
  int msm_ioctl_rmfb2(struct drm_device *dev, void *data,
  		    struct drm_file *file_priv)
  {
  	struct drm_framebuffer *fb = NULL;
  	struct drm_framebuffer *fbl = NULL;
  	uint32_t *id = data;
  	int found = 0;
  
  	if (!drm_core_check_feature(dev, DRIVER_MODESET))
  		return -EINVAL;
  
  	fb = drm_framebuffer_lookup(dev, *id);
  	if (!fb)
  		return -ENOENT;
  
  	/* drop extra ref from traversing drm_framebuffer_lookup */
  	drm_framebuffer_unreference(fb);
  
  	mutex_lock(&file_priv->fbs_lock);
  	list_for_each_entry(fbl, &file_priv->fbs, filp_head)
  		if (fb == fbl)
  			found = 1;
  	if (!found) {
  		mutex_unlock(&file_priv->fbs_lock);
  		return -ENOENT;
  	}
  
  	list_del_init(&fb->filp_head);
  	mutex_unlock(&file_priv->fbs_lock);
  
  	drm_framebuffer_unreference(fb);
  
  	return 0;
  }
  EXPORT_SYMBOL(msm_ioctl_rmfb2);
  
  static const struct drm_ioctl_desc msm_ioctls[] = {
  	DRM_IOCTL_DEF_DRV(MSM_GET_PARAM,    msm_ioctl_get_param,    DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_GEM_NEW,      msm_ioctl_gem_new,      DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_GEM_INFO,     msm_ioctl_gem_info,     DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_GEM_CPU_PREP, msm_ioctl_gem_cpu_prep, DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_GEM_CPU_FINI, msm_ioctl_gem_cpu_fini, DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_GEM_SUBMIT,   msm_ioctl_gem_submit,   DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_WAIT_FENCE,   msm_ioctl_wait_fence,   DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_GEM_MADVISE,  msm_ioctl_gem_madvise,  DRM_AUTH|DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(SDE_WB_CONFIG, sde_wb_config, DRM_UNLOCKED|DRM_AUTH),
  	DRM_IOCTL_DEF_DRV(MSM_REGISTER_EVENT,  msm_ioctl_register_event,
  			  DRM_UNLOCKED|DRM_CONTROL_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_DEREGISTER_EVENT,  msm_ioctl_deregister_event,
  			  DRM_UNLOCKED|DRM_CONTROL_ALLOW),
  	DRM_IOCTL_DEF_DRV(MSM_RMFB2, msm_ioctl_rmfb2,
  			  DRM_CONTROL_ALLOW|DRM_UNLOCKED),
  };
  
  static const struct vm_operations_struct vm_ops = {
  	.fault = msm_gem_fault,
  	.open = drm_gem_vm_open,
  	.close = drm_gem_vm_close,
  };
  
  static const struct file_operations fops = {
  	.owner              = THIS_MODULE,
  	.open               = drm_open,
  	.release            = msm_release,
  	.unlocked_ioctl     = drm_ioctl,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl       = drm_compat_ioctl,
  #endif
  	.poll               = drm_poll,
  	.read               = drm_read,
  	.llseek             = no_llseek,
  	.mmap               = msm_gem_mmap,
  };
  
  static struct drm_driver msm_driver = {
  	.driver_features    = DRIVER_HAVE_IRQ |
  				DRIVER_GEM |
  				DRIVER_PRIME |
  				DRIVER_RENDER |
  				DRIVER_ATOMIC |
  				DRIVER_MODESET,
  	.open               = msm_open,
  	.preclose           = msm_preclose,
  	.postclose          = msm_postclose,
  	.lastclose          = msm_lastclose,
  	.irq_handler        = msm_irq,
  	.irq_preinstall     = msm_irq_preinstall,
  	.irq_postinstall    = msm_irq_postinstall,
  	.irq_uninstall      = msm_irq_uninstall,
  	.get_vblank_counter = drm_vblank_no_hw_counter,
  	.enable_vblank      = msm_enable_vblank,
  	.disable_vblank     = msm_disable_vblank,
  	.gem_free_object    = msm_gem_free_object,
  	.gem_vm_ops         = &vm_ops,
  	.dumb_create        = msm_gem_dumb_create,
  	.dumb_map_offset    = msm_gem_dumb_map_offset,
  	.dumb_destroy       = drm_gem_dumb_destroy,
  	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  	.gem_prime_export   = drm_gem_prime_export,
  	.gem_prime_import   = drm_gem_prime_import,
  	.gem_prime_res_obj  = msm_gem_prime_res_obj,
  	.gem_prime_pin      = msm_gem_prime_pin,
  	.gem_prime_unpin    = msm_gem_prime_unpin,
  	.gem_prime_get_sg_table = msm_gem_prime_get_sg_table,
  	.gem_prime_import_sg_table = msm_gem_prime_import_sg_table,
  	.gem_prime_vmap     = msm_gem_prime_vmap,
  	.gem_prime_vunmap   = msm_gem_prime_vunmap,
  	.gem_prime_mmap     = msm_gem_prime_mmap,
  #ifdef CONFIG_DEBUG_FS
  	.debugfs_init       = msm_debugfs_init,
  	.debugfs_cleanup    = msm_debugfs_cleanup,
  #endif
  	.ioctls             = msm_ioctls,
  	.num_ioctls         = ARRAY_SIZE(msm_ioctls),
  	.fops               = &fops,
  	.name               = "msm_drm",
  	.desc               = "MSM Snapdragon DRM",
  	.date               = "20130625",
  	.major              = MSM_VERSION_MAJOR,
  	.minor              = MSM_VERSION_MINOR,
  	.patchlevel         = MSM_VERSION_PATCHLEVEL,
  };
  
  #ifdef CONFIG_PM_SLEEP
  static int msm_pm_suspend(struct device *dev)
  {
  	struct drm_device *ddev;
  	struct msm_drm_private *priv;
  	struct msm_kms *kms;
  
  	if (!dev)
  		return -EINVAL;
  
  	ddev = dev_get_drvdata(dev);
  	if (!ddev || !ddev->dev_private)
  		return -EINVAL;
  
  	priv = ddev->dev_private;
  	kms = priv->kms;
  
  	if (kms && kms->funcs && kms->funcs->pm_suspend)
  		return kms->funcs->pm_suspend(dev);
  
  	/* disable hot-plug polling */
  	drm_kms_helper_poll_disable(ddev);
  
  	return 0;
  }
  
  static int msm_pm_resume(struct device *dev)
  {
  	struct drm_device *ddev;
  	struct msm_drm_private *priv;
  	struct msm_kms *kms;
  
  	if (!dev)
  		return -EINVAL;
  
  	ddev = dev_get_drvdata(dev);
  	if (!ddev || !ddev->dev_private)
  		return -EINVAL;
  
  	priv = ddev->dev_private;
  	kms = priv->kms;
  
  	if (kms && kms->funcs && kms->funcs->pm_resume)
  		return kms->funcs->pm_resume(dev);
  
  	/* enable hot-plug polling */
  	drm_kms_helper_poll_enable(ddev);
  
  	return 0;
  }
  #endif
  
  static const struct dev_pm_ops msm_pm_ops = {
  	SET_SYSTEM_SLEEP_PM_OPS(msm_pm_suspend, msm_pm_resume)
  };
  
  /*
   * Componentized driver support:
   */
  
  /*
   * NOTE: duplication of the same code as exynos or imx (or probably any other).
   * so probably some room for some helpers
   */
  static int compare_of(struct device *dev, void *data)
  {
  	return dev->of_node == data;
  }
  
  /*
   * Identify what components need to be added by parsing what remote-endpoints
   * our MDP output ports are connected to. In the case of LVDS on MDP4, there
   * is no external component that we need to add since LVDS is within MDP4
   * itself.
   */
  static int add_components_mdp(struct device *mdp_dev,
  			      struct component_match **matchptr)
  {
  	struct device_node *np = mdp_dev->of_node;
  	struct device_node *ep_node;
  	struct device *master_dev;
  
  	/*
  	 * on MDP4 based platforms, the MDP platform device is the component
  	 * master that adds other display interface components to itself.
  	 *
  	 * on MDP5 based platforms, the MDSS platform device is the component
  	 * master that adds MDP5 and other display interface components to
  	 * itself.
  	 */
  	if (of_device_is_compatible(np, "qcom,mdp4"))
  		master_dev = mdp_dev;
  	else
  		master_dev = mdp_dev->parent;
  
  	for_each_endpoint_of_node(np, ep_node) {
  		struct device_node *intf;
  		struct of_endpoint ep;
  		int ret;
  
  		ret = of_graph_parse_endpoint(ep_node, &ep);
  		if (ret) {
  			dev_err(mdp_dev, "unable to parse port endpoint\n");
  			of_node_put(ep_node);
  			return ret;
  		}
  
  		/*
  		 * The LCDC/LVDS port on MDP4 is a speacial case where the
  		 * remote-endpoint isn't a component that we need to add
  		 */
  		if (of_device_is_compatible(np, "qcom,mdp4") &&
  		    ep.port == 0) {
  			of_node_put(ep_node);
  			continue;
  		}
  
  		/*
  		 * It's okay if some of the ports don't have a remote endpoint
  		 * specified. It just means that the port isn't connected to
  		 * any external interface.
  		 */
  		intf = of_graph_get_remote_port_parent(ep_node);
  		if (!intf) {
  			of_node_put(ep_node);
  			continue;
  		}
  
  		component_match_add(master_dev, matchptr, compare_of, intf);
  
  		of_node_put(intf);
  		of_node_put(ep_node);
  	}
  
  	return 0;
  }
  
  static int compare_name_mdp(struct device *dev, void *data)
  {
  	return (strnstr(dev_name(dev), "mdp", strlen("mdp")) != NULL);
  }
  
  static int add_display_components(struct device *dev,
  				  struct component_match **matchptr)
  {
  	struct device *mdp_dev = NULL;
  	struct device_node *node;
  	const char *name;
  	int ret;
  
  	if (of_device_is_compatible(dev->of_node, "qcom,sde-kms")) {
  		struct device_node *np = dev->of_node;
  		unsigned int i;
  
  		for (i = 0; ; i++) {
  			node = of_parse_phandle(np, "connectors", i);
  			if (!node)
  				break;
  
  			component_match_add(dev, matchptr, compare_of, node);
  		}
  
  		for (i = 0; i < MAX_DSI_ACTIVE_DISPLAY; i++) {
  			node = dsi_display_get_boot_display(i);
  
  			if (node != NULL) {
  				name = of_get_property(node, "label", NULL);
  				component_match_add(dev, matchptr, compare_of,
  						node);
  				pr_debug("Added component = %s\n", name);
  			}
  		}
  
  		return 0;
  	}
  
  	/*
  	 * MDP5 based devices don't have a flat hierarchy. There is a top level
  	 * parent: MDSS, and children: MDP5, DSI, HDMI, eDP etc. Populate the
  	 * children devices, find the MDP5 node, and then add the interfaces
  	 * to our components list.
  	 */
  	if (of_device_is_compatible(dev->of_node, "qcom,mdss")) {
  		ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
  		if (ret) {
  			dev_err(dev, "failed to populate children devices\n");
  			return ret;
  		}
  
  		mdp_dev = device_find_child(dev, NULL, compare_name_mdp);
  		if (!mdp_dev) {
  			dev_err(dev, "failed to find MDSS MDP node\n");
  			of_platform_depopulate(dev);
  			return -ENODEV;
  		}
  
  		put_device(mdp_dev);
  
  		/* add the MDP component itself */
  		component_match_add(dev, matchptr, compare_of,
  				    mdp_dev->of_node);
  	} else {
  		/* MDP4 */
  		mdp_dev = dev;
  	}
  
  	ret = add_components_mdp(mdp_dev, matchptr);
  	if (ret)
  		of_platform_depopulate(dev);
  
  	return ret;
  }
  
  static int add_bridge_components(struct device *dev,
  				  struct component_match **matchptr)
  {
  	struct device_node *node;
  
  	if (of_device_is_compatible(dev->of_node, "qcom,sde-kms")) {
  		struct device_node *np = dev->of_node;
  		unsigned int i;
  
  		for (i = 0; ; i++) {
  			node = of_parse_phandle(np, "bridges", i);
  			if (!node)
  				break;
  
  			component_match_add(dev, matchptr, compare_of, node);
  		}
  	}
  
  	return 0;
  }
  
  struct msm_gem_address_space *
  msm_gem_smmu_address_space_get(struct drm_device *dev,
  		unsigned int domain)
  {
  	struct msm_drm_private *priv = NULL;
  	struct msm_kms *kms;
  	const struct msm_kms_funcs *funcs;
  
  	if ((!dev) || (!dev->dev_private))
  		return NULL;
  
  	priv = dev->dev_private;
  	kms = priv->kms;
  	if (!kms)
  		return NULL;
  
  	funcs = kms->funcs;
  
  	if ((!funcs) || (!funcs->get_address_space))
  		return NULL;
  
  	return funcs->get_address_space(priv->kms, domain);
  }
  
  /*
   * We don't know what's the best binding to link the gpu with the drm device.
   * Fow now, we just hunt for all the possible gpus that we support, and add them
   * as components.
   */
  static const struct of_device_id msm_gpu_match[] = {
  	{ .compatible = "qcom,adreno-3xx" },
  	{ .compatible = "qcom,kgsl-3d0" },
  	{ },
  };
  
  #ifdef CONFIG_QCOM_KGSL
  static int add_gpu_components(struct device *dev,
  			      struct component_match **matchptr)
  {
  	return 0;
  }
  #else
  static int add_gpu_components(struct device *dev,
  			      struct component_match **matchptr)
  {
  	struct device_node *np;
  
  	np = of_find_matching_node(NULL, msm_gpu_match);
  	if (!np)
  		return 0;
  
  	component_match_add(dev, matchptr, compare_of, np);
  
  	of_node_put(np);
  
  	return 0;
  }
  #endif
  
  static int msm_drm_bind(struct device *dev)
  {
  	return msm_drm_init(dev, &msm_driver);
  }
  
  static void msm_drm_unbind(struct device *dev)
  {
  	msm_drm_uninit(dev);
  }
  
  static const struct component_master_ops msm_drm_ops = {
  	.bind = msm_drm_bind,
  	.unbind = msm_drm_unbind,
  };
  
  /*
   * Platform driver:
   */
  
  static int msm_pdev_probe(struct platform_device *pdev)
  {
  	int ret;
  	struct component_match *match = NULL;
  
  	ret = add_display_components(&pdev->dev, &match);
  	if (ret)
  		return ret;
  
  	ret = add_gpu_components(&pdev->dev, &match);
  	if (ret)
  		return ret;
  
  	ret = add_bridge_components(&pdev->dev, &match);
  	if (ret)
  		return ret;
  
  	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
  	return component_master_add_with_match(&pdev->dev, &msm_drm_ops, match);
  }
  
  static int msm_pdev_remove(struct platform_device *pdev)
  {
  	component_master_del(&pdev->dev, &msm_drm_ops);
  	of_platform_depopulate(&pdev->dev);
  
  	msm_drm_unbind(&pdev->dev);
  	return 0;
  }
  
  static void msm_pdev_shutdown(struct platform_device *pdev)
  {
  	struct drm_device *ddev = platform_get_drvdata(pdev);
  	struct msm_drm_private *priv = NULL;
  
  	if (!ddev) {
  		DRM_ERROR("invalid drm device node\n");
  		return;
  	}
  
  	priv = ddev->dev_private;
  	if (!priv) {
  		DRM_ERROR("invalid msm drm private node\n");
  		return;
  	}
  
  	msm_lastclose(ddev);
  
  	/* set this after lastclose to allow kickoff from lastclose */
  	priv->shutdown_in_progress = true;
  }
  
  static const struct of_device_id dt_match[] = {
  	{ .compatible = "qcom,mdp4", .data = (void *)4 },	/* MDP4 */
  	{ .compatible = "qcom,mdss", .data = (void *)5 },	/* MDP5 MDSS */
  	{ .compatible = "qcom,sde-kms", .data = (void *)3 },	/* sde */
  	{}
  };
  MODULE_DEVICE_TABLE(of, dt_match);
  
  static struct platform_driver msm_platform_driver = {
  	.probe      = msm_pdev_probe,
  	.remove     = msm_pdev_remove,
  	.shutdown   = msm_pdev_shutdown,
  	.driver     = {
  		.name   = "msm_drm",
  		.of_match_table = dt_match,
  		.pm     = &msm_pm_ops,
  		.suppress_bind_attrs = true,
  	},
  };
  
  #ifdef CONFIG_QCOM_KGSL
  void __init adreno_register(void)
  {
  }
  
  void __exit adreno_unregister(void)
  {
  }
  #endif
  
  static int __init msm_drm_register(void)
  {
  	DBG("init");
  	msm_smmu_driver_init();
  	msm_dsi_register();
  	msm_edp_register();
  	msm_hdmi_register();
  	adreno_register();
  	return platform_driver_register(&msm_platform_driver);
  }
  
  static void __exit msm_drm_unregister(void)
  {
  	DBG("fini");
  	platform_driver_unregister(&msm_platform_driver);
  	msm_hdmi_unregister();
  	adreno_unregister();
  	msm_edp_unregister();
  	msm_dsi_unregister();
  	msm_smmu_driver_cleanup();
  }
  
  module_init(msm_drm_register);
  module_exit(msm_drm_unregister);
  
  MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
  MODULE_DESCRIPTION("MSM DRM Driver");
  MODULE_LICENSE("GPL");
  