drivers/gpu/drm/vc4/vc4_v3d.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (c) 2014 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/>.
  */

 #include "linux/component.h"
 #include "linux/pm_runtime.h"
 #include "vc4_drv.h"
 #include "vc4_regs.h"

 #ifdef CONFIG_DEBUG_FS
 #define REGDEF(reg) { reg, #reg }
 static const struct {
 	uint32_t reg;
 	const char *name;
 } vc4_reg_defs[] = {
 	REGDEF(V3D_IDENT0),
 	REGDEF(V3D_IDENT1),
 	REGDEF(V3D_IDENT2),
 	REGDEF(V3D_SCRATCH),
 	REGDEF(V3D_L2CACTL),
 	REGDEF(V3D_SLCACTL),
 	REGDEF(V3D_INTCTL),
 	REGDEF(V3D_INTENA),
 	REGDEF(V3D_INTDIS),
 	REGDEF(V3D_CT0CS),
 	REGDEF(V3D_CT1CS),
 	REGDEF(V3D_CT0EA),
 	REGDEF(V3D_CT1EA),
 	REGDEF(V3D_CT0CA),
 	REGDEF(V3D_CT1CA),
 	REGDEF(V3D_CT00RA0),
 	REGDEF(V3D_CT01RA0),
 	REGDEF(V3D_CT0LC),
 	REGDEF(V3D_CT1LC),
 	REGDEF(V3D_CT0PC),
 	REGDEF(V3D_CT1PC),
 	REGDEF(V3D_PCS),
 	REGDEF(V3D_BFC),
 	REGDEF(V3D_RFC),
 	REGDEF(V3D_BPCA),
 	REGDEF(V3D_BPCS),
 	REGDEF(V3D_BPOA),
 	REGDEF(V3D_BPOS),
 	REGDEF(V3D_BXCF),
 	REGDEF(V3D_SQRSV0),
 	REGDEF(V3D_SQRSV1),
 	REGDEF(V3D_SQCNTL),
 	REGDEF(V3D_SRQPC),
 	REGDEF(V3D_SRQUA),
 	REGDEF(V3D_SRQUL),
 	REGDEF(V3D_SRQCS),
 	REGDEF(V3D_VPACNTL),
 	REGDEF(V3D_VPMBASE),
 	REGDEF(V3D_PCTRC),
 	REGDEF(V3D_PCTRE),
 	REGDEF(V3D_PCTR0),
 	REGDEF(V3D_PCTRS0),
 	REGDEF(V3D_PCTR1),
 	REGDEF(V3D_PCTRS1),
 	REGDEF(V3D_PCTR2),
 	REGDEF(V3D_PCTRS2),
 	REGDEF(V3D_PCTR3),
 	REGDEF(V3D_PCTRS3),
 	REGDEF(V3D_PCTR4),
 	REGDEF(V3D_PCTRS4),
 	REGDEF(V3D_PCTR5),
 	REGDEF(V3D_PCTRS5),
 	REGDEF(V3D_PCTR6),
 	REGDEF(V3D_PCTRS6),
 	REGDEF(V3D_PCTR7),
 	REGDEF(V3D_PCTRS7),
 	REGDEF(V3D_PCTR8),
 	REGDEF(V3D_PCTRS8),
 	REGDEF(V3D_PCTR9),
 	REGDEF(V3D_PCTRS9),
 	REGDEF(V3D_PCTR10),
 	REGDEF(V3D_PCTRS10),
 	REGDEF(V3D_PCTR11),
 	REGDEF(V3D_PCTRS11),
 	REGDEF(V3D_PCTR12),
 	REGDEF(V3D_PCTRS12),
 	REGDEF(V3D_PCTR13),
 	REGDEF(V3D_PCTRS13),
 	REGDEF(V3D_PCTR14),
 	REGDEF(V3D_PCTRS14),
 	REGDEF(V3D_PCTR15),
 	REGDEF(V3D_PCTRS15),
 	REGDEF(V3D_DBGE),
 	REGDEF(V3D_FDBGO),
 	REGDEF(V3D_FDBGB),
 	REGDEF(V3D_FDBGR),
 	REGDEF(V3D_FDBGS),
 	REGDEF(V3D_ERRSTAT),
 };

 int vc4_v3d_debugfs_regs(struct seq_file *m, void *unused)
 {
 	struct drm_info_node *node = (struct drm_info_node *)m->private;
 	struct drm_device *dev = node->minor->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int i;

 	for (i = 0; i < ARRAY_SIZE(vc4_reg_defs); i++) {
 		seq_printf(m, "%s (0x%04x): 0x%08x\n",
 			   vc4_reg_defs[i].name, vc4_reg_defs[i].reg,
 			   V3D_READ(vc4_reg_defs[i].reg));
 	}

 	return 0;
 }

 int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
 {
 	struct drm_info_node *node = (struct drm_info_node *)m->private;
 	struct drm_device *dev = node->minor->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	uint32_t ident1 = V3D_READ(V3D_IDENT1);
 	uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
 	uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
 	uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);

 	seq_printf(m, "Revision:   %d\n",
 		   VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
 	seq_printf(m, "Slices:     %d\n", nslc);
 	seq_printf(m, "TMUs:       %d\n", nslc * tups);
 	seq_printf(m, "QPUs:       %d\n", nslc * qups);
 	seq_printf(m, "Semaphores: %d\n",
 		   VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));

 	return 0;
 }
 #endif /* CONFIG_DEBUG_FS */

 static void vc4_v3d_init_hw(struct drm_device *dev)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);

 	/* Take all the memory that would have been reserved for user
 	 * QPU programs, since we don't have an interface for running
 	 * them, anyway.
 	 */
 	V3D_WRITE(V3D_VPMBASE, 0);
 }

 int vc4_v3d_get_bin_slot(struct vc4_dev *vc4)
 {
 	struct drm_device *dev = vc4->dev;
 	unsigned long irqflags;
 	int slot;
 	uint64_t seqno = 0;
 	struct vc4_exec_info *exec;

 try_again:
 	spin_lock_irqsave(&vc4->job_lock, irqflags);
 	slot = ffs(~vc4->bin_alloc_used);
 	if (slot != 0) {
 		/* Switch from ffs() bit index to a 0-based index. */
 		slot--;
 		vc4->bin_alloc_used |= BIT(slot);
 		spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 		return slot;
 	}

 	/* Couldn't find an open slot.  Wait for render to complete
 	 * and try again.
 	 */
 	exec = vc4_last_render_job(vc4);
 	if (exec)
 		seqno = exec->seqno;
 	spin_unlock_irqrestore(&vc4->job_lock, irqflags);

 	if (seqno) {
 		int ret = vc4_wait_for_seqno(dev, seqno, ~0ull, true);

 		if (ret == 0)
 			goto try_again;

 		return ret;
 	}

 	return -ENOMEM;
 }

 /**
  * vc4_allocate_bin_bo() - allocates the memory that will be used for
  * tile binning.
  *
  * The binner has a limitation that the addresses in the tile state
  * buffer that point into the tile alloc buffer or binner overflow
  * memory only have 28 bits (256MB), and the top 4 on the bus for
  * tile alloc references end up coming from the tile state buffer's
  * address.
  *
  * To work around this, we allocate a single large buffer while V3D is
  * in use, make sure that it has the top 4 bits constant across its
  * entire extent, and then put the tile state, tile alloc, and binner
  * overflow memory inside that buffer.
  *
  * This creates a limitation where we may not be able to execute a job
  * if it doesn't fit within the buffer that we allocated up front.
  * However, it turns out that 16MB is "enough for anybody", and
  * real-world applications run into allocation failures from the
  * overall CMA pool before they make scenes complicated enough to run
  * out of bin space.
  */
 int
 vc4_allocate_bin_bo(struct drm_device *drm)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_v3d *v3d = vc4->v3d;
 	uint32_t size = 16 * 1024 * 1024;
 	int ret = 0;
 	struct list_head list;

 	/* We may need to try allocating more than once to get a BO
 	 * that doesn't cross 256MB.  Track the ones we've allocated
 	 * that failed so far, so that we can free them when we've got
 	 * one that succeeded (if we freed them right away, our next
 	 * allocation would probably be the same chunk of memory).
 	 */
 	INIT_LIST_HEAD(&list);

 	while (true) {
 		struct vc4_bo *bo = vc4_bo_create(drm, size, true);

 		if (IS_ERR(bo)) {
 			ret = PTR_ERR(bo);

 			dev_err(&v3d->pdev->dev,
 				"Failed to allocate memory for tile binning: "
 				"%d. You may need to enable CMA or give it "
 				"more memory.",
 				ret);
 			break;
 		}

 		/* Check if this BO won't trigger the addressing bug. */
 		if ((bo->base.paddr & 0xf0000000) ==
 		    ((bo->base.paddr + bo->base.base.size - 1) & 0xf0000000)) {
 			vc4->bin_bo = bo;

 			/* Set up for allocating 512KB chunks of
 			 * binner memory.  The biggest allocation we
 			 * need to do is for the initial tile alloc +
 			 * tile state buffer.  We can render to a
 			 * maximum of ((2048*2048) / (32*32) = 4096
 			 * tiles in a frame (until we do floating
 			 * point rendering, at which point it would be
 			 * 8192).  Tile state is 48b/tile (rounded to
 			 * a page), and tile alloc is 32b/tile
 			 * (rounded to a page), plus a page of extra,
 			 * for a total of 320kb for our worst-case.
 			 * We choose 512kb so that it divides evenly
 			 * into our 16MB, and the rest of the 512kb
 			 * will be used as storage for the overflow
 			 * from the initial 32b CL per bin.
 			 */
 			vc4->bin_alloc_size = 512 * 1024;
 			vc4->bin_alloc_used = 0;
 			vc4->bin_alloc_overflow = 0;
 			WARN_ON_ONCE(sizeof(vc4->bin_alloc_used) * 8 !=
 				     bo->base.base.size / vc4->bin_alloc_size);

 			break;
 		}

 		/* Put it on the list to free later, and try again. */
 		list_add(&bo->unref_head, &list);
 	}

 	/* Free all the BOs we allocated but didn't choose. */
 	while (!list_empty(&list)) {
 		struct vc4_bo *bo = list_last_entry(&list,
 						    struct vc4_bo, unref_head);

 		list_del(&bo->unref_head);
 		drm_gem_object_put_unlocked(&bo->base.base);
 	}

 	return ret;
 }

 #ifdef CONFIG_PM
 static int vc4_v3d_runtime_suspend(struct device *dev)
 {
 	struct vc4_v3d *v3d = dev_get_drvdata(dev);
 	struct vc4_dev *vc4 = v3d->vc4;

 	vc4_irq_uninstall(vc4->dev);

 	drm_gem_object_put_unlocked(&vc4->bin_bo->base.base);
 	vc4->bin_bo = NULL;

 	return 0;
 }

 static int vc4_v3d_runtime_resume(struct device *dev)
 {
 	struct vc4_v3d *v3d = dev_get_drvdata(dev);
 	struct vc4_dev *vc4 = v3d->vc4;
 	int ret;

 	ret = vc4_allocate_bin_bo(vc4->dev);
 	if (ret)
 		return ret;

 	vc4_v3d_init_hw(vc4->dev);
 	vc4_irq_postinstall(vc4->dev);

 	return 0;
 }
 #endif

 static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct drm_device *drm = dev_get_drvdata(master);
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_v3d *v3d = NULL;
 	int ret;

 	v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
 	if (!v3d)
 		return -ENOMEM;

 	dev_set_drvdata(dev, v3d);

 	v3d->pdev = pdev;

 	v3d->regs = vc4_ioremap_regs(pdev, 0);
 	if (IS_ERR(v3d->regs))
 		return PTR_ERR(v3d->regs);

 	vc4->v3d = v3d;
 	v3d->vc4 = vc4;

 	if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
 		DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
 			  V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
 		return -EINVAL;
 	}

 	ret = vc4_allocate_bin_bo(drm);
 	if (ret)
 		return ret;

 	/* Reset the binner overflow address/size at setup, to be sure
 	 * we don't reuse an old one.
 	 */
 	V3D_WRITE(V3D_BPOA, 0);
 	V3D_WRITE(V3D_BPOS, 0);

 	vc4_v3d_init_hw(drm);

 	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
 	if (ret) {
 		DRM_ERROR("Failed to install IRQ handler\n");
 		return ret;
 	}

 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */
 	pm_runtime_enable(dev);

 	return 0;
 }

 static void vc4_v3d_unbind(struct device *dev, struct device *master,
 			   void *data)
 {
 	struct drm_device *drm = dev_get_drvdata(master);
 	struct vc4_dev *vc4 = to_vc4_dev(drm);

 	pm_runtime_disable(dev);

 	drm_irq_uninstall(drm);

 	/* Disable the binner's overflow memory address, so the next
 	 * driver probe (if any) doesn't try to reuse our old
 	 * allocation.
 	 */
 	V3D_WRITE(V3D_BPOA, 0);
 	V3D_WRITE(V3D_BPOS, 0);

 	vc4->v3d = NULL;
 }

 static const struct dev_pm_ops vc4_v3d_pm_ops = {
 	SET_RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
 };

 static const struct component_ops vc4_v3d_ops = {
 	.bind   = vc4_v3d_bind,
 	.unbind = vc4_v3d_unbind,
 };

 static int vc4_v3d_dev_probe(struct platform_device *pdev)
 {
 	return component_add(&pdev->dev, &vc4_v3d_ops);
 }

 static int vc4_v3d_dev_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &vc4_v3d_ops);
 	return 0;
 }

 static const struct of_device_id vc4_v3d_dt_match[] = {
 	{ .compatible = "brcm,bcm2835-v3d" },
 	{ .compatible = "brcm,vc4-v3d" },
 	{}
 };

 struct platform_driver vc4_v3d_driver = {
 	.probe = vc4_v3d_dev_probe,
 	.remove = vc4_v3d_dev_remove,
 	.driver = {
 		.name = "vc4_v3d",
 		.of_match_table = vc4_v3d_dt_match,
 		.pm = &vc4_v3d_pm_ops,
 	},
 };
	/*
	* Copyright (c) 2014 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/>.
	*/

	#include "linux/component.h"
	#include "linux/pm_runtime.h"
	#include "vc4_drv.h"
	#include "vc4_regs.h"

	#ifdef CONFIG_DEBUG_FS
	#define REGDEF(reg) { reg, #reg }
	static const struct {
	uint32_t reg;
	const char *name;
	} vc4_reg_defs[] = {
	REGDEF(V3D_IDENT0),
	REGDEF(V3D_IDENT1),
	REGDEF(V3D_IDENT2),
	REGDEF(V3D_SCRATCH),
	REGDEF(V3D_L2CACTL),
	REGDEF(V3D_SLCACTL),
	REGDEF(V3D_INTCTL),
	REGDEF(V3D_INTENA),
	REGDEF(V3D_INTDIS),
	REGDEF(V3D_CT0CS),
	REGDEF(V3D_CT1CS),
	REGDEF(V3D_CT0EA),
	REGDEF(V3D_CT1EA),
	REGDEF(V3D_CT0CA),
	REGDEF(V3D_CT1CA),
	REGDEF(V3D_CT00RA0),
	REGDEF(V3D_CT01RA0),
	REGDEF(V3D_CT0LC),
	REGDEF(V3D_CT1LC),
	REGDEF(V3D_CT0PC),
	REGDEF(V3D_CT1PC),
	REGDEF(V3D_PCS),
	REGDEF(V3D_BFC),
	REGDEF(V3D_RFC),
	REGDEF(V3D_BPCA),
	REGDEF(V3D_BPCS),
	REGDEF(V3D_BPOA),
	REGDEF(V3D_BPOS),
	REGDEF(V3D_BXCF),
	REGDEF(V3D_SQRSV0),
	REGDEF(V3D_SQRSV1),
	REGDEF(V3D_SQCNTL),
	REGDEF(V3D_SRQPC),
	REGDEF(V3D_SRQUA),
	REGDEF(V3D_SRQUL),
	REGDEF(V3D_SRQCS),
	REGDEF(V3D_VPACNTL),
	REGDEF(V3D_VPMBASE),
	REGDEF(V3D_PCTRC),
	REGDEF(V3D_PCTRE),
	REGDEF(V3D_PCTR0),
	REGDEF(V3D_PCTRS0),
	REGDEF(V3D_PCTR1),
	REGDEF(V3D_PCTRS1),
	REGDEF(V3D_PCTR2),
	REGDEF(V3D_PCTRS2),
	REGDEF(V3D_PCTR3),
	REGDEF(V3D_PCTRS3),
	REGDEF(V3D_PCTR4),
	REGDEF(V3D_PCTRS4),
	REGDEF(V3D_PCTR5),
	REGDEF(V3D_PCTRS5),
	REGDEF(V3D_PCTR6),
	REGDEF(V3D_PCTRS6),
	REGDEF(V3D_PCTR7),
	REGDEF(V3D_PCTRS7),
	REGDEF(V3D_PCTR8),
	REGDEF(V3D_PCTRS8),
	REGDEF(V3D_PCTR9),
	REGDEF(V3D_PCTRS9),
	REGDEF(V3D_PCTR10),
	REGDEF(V3D_PCTRS10),
	REGDEF(V3D_PCTR11),
	REGDEF(V3D_PCTRS11),
	REGDEF(V3D_PCTR12),
	REGDEF(V3D_PCTRS12),
	REGDEF(V3D_PCTR13),
	REGDEF(V3D_PCTRS13),
	REGDEF(V3D_PCTR14),
	REGDEF(V3D_PCTRS14),
	REGDEF(V3D_PCTR15),
	REGDEF(V3D_PCTRS15),
	REGDEF(V3D_DBGE),
	REGDEF(V3D_FDBGO),
	REGDEF(V3D_FDBGB),
	REGDEF(V3D_FDBGR),
	REGDEF(V3D_FDBGS),
	REGDEF(V3D_ERRSTAT),
	};

	int vc4_v3d_debugfs_regs(struct seq_file m, void unused)
	{
	struct drm_info_node node = (struct drm_info_node )m->private;
	struct drm_device *dev = node->minor->dev;
	struct vc4_dev *vc4 = to_vc4_dev(dev);
	int i;

	for (i = 0; i < ARRAY_SIZE(vc4_reg_defs); i++) {
	seq_printf(m, "%s (0x%04x): 0x%08x\n",
	vc4_reg_defs[i].name, vc4_reg_defs[i].reg,
	V3D_READ(vc4_reg_defs[i].reg));
	}

	return 0;
	}

	int vc4_v3d_debugfs_ident(struct seq_file m, void unused)
	{
	struct drm_info_node node = (struct drm_info_node )m->private;
	struct drm_device *dev = node->minor->dev;
	struct vc4_dev *vc4 = to_vc4_dev(dev);
	uint32_t ident1 = V3D_READ(V3D_IDENT1);
	uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
	uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
	uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);

	seq_printf(m, "Revision: %d\n",
	VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
	seq_printf(m, "Slices: %d\n", nslc);
	seq_printf(m, "TMUs: %d\n", nslc * tups);
	seq_printf(m, "QPUs: %d\n", nslc * qups);
	seq_printf(m, "Semaphores: %d\n",
	VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));

	return 0;
	}
	#endif /* CONFIG_DEBUG_FS */

	static void vc4_v3d_init_hw(struct drm_device *dev)
	{
	struct vc4_dev *vc4 = to_vc4_dev(dev);

	/* Take all the memory that would have been reserved for user
	* QPU programs, since we don't have an interface for running
	* them, anyway.
	*/
	V3D_WRITE(V3D_VPMBASE, 0);
	}

	int vc4_v3d_get_bin_slot(struct vc4_dev *vc4)
	{
	struct drm_device *dev = vc4->dev;
	unsigned long irqflags;
	int slot;
	uint64_t seqno = 0;
	struct vc4_exec_info *exec;

	try_again:
	spin_lock_irqsave(&vc4->job_lock, irqflags);
	slot = ffs(~vc4->bin_alloc_used);
	if (slot != 0) {
	/* Switch from ffs() bit index to a 0-based index. */
	slot--;
	vc4->bin_alloc_used \|= BIT(slot);
	spin_unlock_irqrestore(&vc4->job_lock, irqflags);
	return slot;
	}

	/* Couldn't find an open slot. Wait for render to complete
	* and try again.
	*/
	exec = vc4_last_render_job(vc4);
	if (exec)
	seqno = exec->seqno;
	spin_unlock_irqrestore(&vc4->job_lock, irqflags);

	if (seqno) {
	int ret = vc4_wait_for_seqno(dev, seqno, ~0ull, true);

	if (ret == 0)
	goto try_again;

	return ret;
	}

	return -ENOMEM;
	}

	/**
	* vc4_allocate_bin_bo() - allocates the memory that will be used for
	* tile binning.
	*
	* The binner has a limitation that the addresses in the tile state
	* buffer that point into the tile alloc buffer or binner overflow
	* memory only have 28 bits (256MB), and the top 4 on the bus for
	* tile alloc references end up coming from the tile state buffer's
	* address.
	*
	* To work around this, we allocate a single large buffer while V3D is
	* in use, make sure that it has the top 4 bits constant across its
	* entire extent, and then put the tile state, tile alloc, and binner
	* overflow memory inside that buffer.
	*
	* This creates a limitation where we may not be able to execute a job
	* if it doesn't fit within the buffer that we allocated up front.
	* However, it turns out that 16MB is "enough for anybody", and
	* real-world applications run into allocation failures from the
	* overall CMA pool before they make scenes complicated enough to run
	* out of bin space.
	*/
	int
	vc4_allocate_bin_bo(struct drm_device *drm)
	{
	struct vc4_dev *vc4 = to_vc4_dev(drm);
	struct vc4_v3d *v3d = vc4->v3d;
	uint32_t size = 16 * 1024 * 1024;
	int ret = 0;
	struct list_head list;

	/* We may need to try allocating more than once to get a BO
	* that doesn't cross 256MB. Track the ones we've allocated
	* that failed so far, so that we can free them when we've got
	* one that succeeded (if we freed them right away, our next
	* allocation would probably be the same chunk of memory).
	*/
	INIT_LIST_HEAD(&list);

	while (true) {
	struct vc4_bo *bo = vc4_bo_create(drm, size, true);

	if (IS_ERR(bo)) {
	ret = PTR_ERR(bo);

	dev_err(&v3d->pdev->dev,
	"Failed to allocate memory for tile binning: "
	"%d. You may need to enable CMA or give it "
	"more memory.",
	ret);
	break;
	}

	/* Check if this BO won't trigger the addressing bug. */
	if ((bo->base.paddr & 0xf0000000) ==
	((bo->base.paddr + bo->base.base.size - 1) & 0xf0000000)) {
	vc4->bin_bo = bo;

	/* Set up for allocating 512KB chunks of
	* binner memory. The biggest allocation we
	* need to do is for the initial tile alloc +
	* tile state buffer. We can render to a
	* maximum of ((20482048) / (3232) = 4096
	* tiles in a frame (until we do floating
	* point rendering, at which point it would be
	* 8192). Tile state is 48b/tile (rounded to
	* a page), and tile alloc is 32b/tile
	* (rounded to a page), plus a page of extra,
	* for a total of 320kb for our worst-case.
	* We choose 512kb so that it divides evenly
	* into our 16MB, and the rest of the 512kb
	* will be used as storage for the overflow
	* from the initial 32b CL per bin.
	*/
	vc4->bin_alloc_size = 512 * 1024;
	vc4->bin_alloc_used = 0;
	vc4->bin_alloc_overflow = 0;
	WARN_ON_ONCE(sizeof(vc4->bin_alloc_used) * 8 !=
	bo->base.base.size / vc4->bin_alloc_size);

	break;
	}

	/* Put it on the list to free later, and try again. */
	list_add(&bo->unref_head, &list);
	}

	/* Free all the BOs we allocated but didn't choose. */
	while (!list_empty(&list)) {
	struct vc4_bo *bo = list_last_entry(&list,
	struct vc4_bo, unref_head);

	list_del(&bo->unref_head);
	drm_gem_object_put_unlocked(&bo->base.base);
	}

	return ret;
	}

	#ifdef CONFIG_PM
	static int vc4_v3d_runtime_suspend(struct device *dev)
	{
	struct vc4_v3d *v3d = dev_get_drvdata(dev);
	struct vc4_dev *vc4 = v3d->vc4;

	vc4_irq_uninstall(vc4->dev);

	drm_gem_object_put_unlocked(&vc4->bin_bo->base.base);
	vc4->bin_bo = NULL;

	return 0;
	}

	static int vc4_v3d_runtime_resume(struct device *dev)
	{
	struct vc4_v3d *v3d = dev_get_drvdata(dev);
	struct vc4_dev *vc4 = v3d->vc4;
	int ret;

	ret = vc4_allocate_bin_bo(vc4->dev);
	if (ret)
	return ret;

	vc4_v3d_init_hw(vc4->dev);
	vc4_irq_postinstall(vc4->dev);

	return 0;
	}
	#endif

	static int vc4_v3d_bind(struct device dev, struct device master, void *data)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct drm_device *drm = dev_get_drvdata(master);
	struct vc4_dev *vc4 = to_vc4_dev(drm);
	struct vc4_v3d *v3d = NULL;
	int ret;

	v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
	if (!v3d)
	return -ENOMEM;

	dev_set_drvdata(dev, v3d);

	v3d->pdev = pdev;

	v3d->regs = vc4_ioremap_regs(pdev, 0);
	if (IS_ERR(v3d->regs))
	return PTR_ERR(v3d->regs);

	vc4->v3d = v3d;
	v3d->vc4 = vc4;

	if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
	DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
	V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
	return -EINVAL;
	}

	ret = vc4_allocate_bin_bo(drm);
	if (ret)
	return ret;

	/* Reset the binner overflow address/size at setup, to be sure
	* we don't reuse an old one.
	*/
	V3D_WRITE(V3D_BPOA, 0);
	V3D_WRITE(V3D_BPOS, 0);

	vc4_v3d_init_hw(drm);

	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
	if (ret) {
	DRM_ERROR("Failed to install IRQ handler\n");
	return ret;
	}

	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */
	pm_runtime_enable(dev);

	return 0;
	}

	static void vc4_v3d_unbind(struct device dev, struct device master,
	void *data)
	{
	struct drm_device *drm = dev_get_drvdata(master);
	struct vc4_dev *vc4 = to_vc4_dev(drm);

	pm_runtime_disable(dev);

	drm_irq_uninstall(drm);

	/* Disable the binner's overflow memory address, so the next
	* driver probe (if any) doesn't try to reuse our old
	* allocation.
	*/
	V3D_WRITE(V3D_BPOA, 0);
	V3D_WRITE(V3D_BPOS, 0);

	vc4->v3d = NULL;
	}

	static const struct dev_pm_ops vc4_v3d_pm_ops = {
	SET_RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
	};

	static const struct component_ops vc4_v3d_ops = {
	.bind = vc4_v3d_bind,
	.unbind = vc4_v3d_unbind,
	};

	static int vc4_v3d_dev_probe(struct platform_device *pdev)
	{
	return component_add(&pdev->dev, &vc4_v3d_ops);
	}

	static int vc4_v3d_dev_remove(struct platform_device *pdev)
	{
	component_del(&pdev->dev, &vc4_v3d_ops);
	return 0;
	}

	static const struct of_device_id vc4_v3d_dt_match[] = {
	{ .compatible = "brcm,bcm2835-v3d" },
	{ .compatible = "brcm,vc4-v3d" },
	{}
	};

	struct platform_driver vc4_v3d_driver = {
	.probe = vc4_v3d_dev_probe,
	.remove = vc4_v3d_dev_remove,
	.driver = {
	.name = "vc4_v3d",
	.of_match_table = vc4_v3d_dt_match,
	.pm = &vc4_v3d_pm_ops,
	},
	};