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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
   4 * Author: Rob Clark <rob.clark@linaro.org>
   5 */
   6
   7#include <linux/dma-mapping.h>
   8#include <linux/seq_file.h>
   9#include <linux/shmem_fs.h>
  10#include <linux/spinlock.h>
  11#include <linux/pfn_t.h>
  12
  13#include <drm/drm_prime.h>
  14#include <drm/drm_vma_manager.h>
  15
  16#include "omap_drv.h"
  17#include "omap_dmm_tiler.h"
  18
  19/*
  20 * GEM buffer object implementation.
  21 */
  22
  23/* note: we use upper 8 bits of flags for driver-internal flags: */
  24#define OMAP_BO_MEM_DMA_API	0x01000000	/* memory allocated with the dma_alloc_* API */
  25#define OMAP_BO_MEM_SHMEM	0x02000000	/* memory allocated through shmem backing */
  26#define OMAP_BO_MEM_DMABUF	0x08000000	/* memory imported from a dmabuf */
  27
  28struct omap_gem_object {
  29	struct drm_gem_object base;
  30
  31	struct list_head mm_list;
  32
  33	u32 flags;
  34
  35	/** width/height for tiled formats (rounded up to slot boundaries) */
  36	u16 width, height;
  37
  38	/** roll applied when mapping to DMM */
  39	u32 roll;
  40
  41	/** protects pin_cnt, block, pages, dma_addrs and vaddr */
  42	struct mutex lock;
  43
  44	/**
  45	 * dma_addr contains the buffer DMA address. It is valid for
  46	 *
  47	 * - buffers allocated through the DMA mapping API (with the
  48	 *   OMAP_BO_MEM_DMA_API flag set)
  49	 *
  50	 * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
  51	 *   if they are physically contiguous (when sgt->orig_nents == 1)
  52	 *
  53	 * - buffers mapped through the TILER when pin_cnt is not zero, in which
  54	 *   case the DMA address points to the TILER aperture
  55	 *
  56	 * Physically contiguous buffers have their DMA address equal to the
  57	 * physical address as we don't remap those buffers through the TILER.
  58	 *
  59	 * Buffers mapped to the TILER have their DMA address pointing to the
  60	 * TILER aperture. As TILER mappings are refcounted (through pin_cnt)
  61	 * the DMA address must be accessed through omap_gem_pin() to ensure
  62	 * that the mapping won't disappear unexpectedly. References must be
  63	 * released with omap_gem_unpin().
  64	 */
  65	dma_addr_t dma_addr;
  66
  67	/**
  68	 * # of users
  69	 */
  70	refcount_t pin_cnt;
  71
  72	/**
  73	 * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
  74	 * is set and the sgt field is valid.
  75	 */
  76	struct sg_table *sgt;
  77
  78	/**
  79	 * tiler block used when buffer is remapped in DMM/TILER.
  80	 */
  81	struct tiler_block *block;
  82
  83	/**
  84	 * Array of backing pages, if allocated.  Note that pages are never
  85	 * allocated for buffers originally allocated from contiguous memory
  86	 */
  87	struct page **pages;
  88
  89	/** addresses corresponding to pages in above array */
  90	dma_addr_t *dma_addrs;
  91
  92	/**
  93	 * Virtual address, if mapped.
  94	 */
  95	void *vaddr;
  96};
  97
  98#define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
  99
 100/* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
 101 * not necessarily pinned in TILER all the time, and (b) when they are
 102 * they are not necessarily page aligned, we reserve one or more small
 103 * regions in each of the 2d containers to use as a user-GART where we
 104 * can create a second page-aligned mapping of parts of the buffer
 105 * being accessed from userspace.
 106 *
 107 * Note that we could optimize slightly when we know that multiple
 108 * tiler containers are backed by the same PAT.. but I'll leave that
 109 * for later..
 110 */
 111#define NUM_USERGART_ENTRIES 2
 112struct omap_drm_usergart_entry {
 113	struct tiler_block *block;	/* the reserved tiler block */
 114	dma_addr_t dma_addr;
 115	struct drm_gem_object *obj;	/* the current pinned obj */
 116	pgoff_t obj_pgoff;		/* page offset of obj currently
 117					   mapped in */
 118};
 119
 120struct omap_drm_usergart {
 121	struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
 122	int height;				/* height in rows */
 123	int height_shift;		/* ilog2(height in rows) */
 124	int slot_shift;			/* ilog2(width per slot) */
 125	int stride_pfn;			/* stride in pages */
 126	int last;				/* index of last used entry */
 127};
 128
 129/* -----------------------------------------------------------------------------
 130 * Helpers
 131 */
 132
 133/** get mmap offset */
 134u64 omap_gem_mmap_offset(struct drm_gem_object *obj)
 135{
 136	struct drm_device *dev = obj->dev;
 137	int ret;
 138	size_t size;
 139
 140	/* Make it mmapable */
 141	size = omap_gem_mmap_size(obj);
 142	ret = drm_gem_create_mmap_offset_size(obj, size);
 143	if (ret) {
 144		dev_err(dev->dev, "could not allocate mmap offset\n");
 145		return 0;
 146	}
 147
 148	return drm_vma_node_offset_addr(&obj->vma_node);
 149}
 150
 151static bool omap_gem_is_contiguous(struct omap_gem_object *omap_obj)
 152{
 153	if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
 154		return true;
 155
 156	if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1)
 157		return true;
 158
 159	return false;
 160}
 161
 162/* -----------------------------------------------------------------------------
 163 * Eviction
 164 */
 165
 166static void omap_gem_evict_entry(struct drm_gem_object *obj,
 167		enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
 168{
 169	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 170	struct omap_drm_private *priv = obj->dev->dev_private;
 171	int n = priv->usergart[fmt].height;
 172	size_t size = PAGE_SIZE * n;
 173	loff_t off = omap_gem_mmap_offset(obj) +
 174			(entry->obj_pgoff << PAGE_SHIFT);
 175	const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
 176
 177	if (m > 1) {
 178		int i;
 179		/* if stride > than PAGE_SIZE then sparse mapping: */
 180		for (i = n; i > 0; i--) {
 181			unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 182					    off, PAGE_SIZE, 1);
 183			off += PAGE_SIZE * m;
 184		}
 185	} else {
 186		unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 187				    off, size, 1);
 188	}
 189
 190	entry->obj = NULL;
 191}
 192
 193/* Evict a buffer from usergart, if it is mapped there */
 194static void omap_gem_evict(struct drm_gem_object *obj)
 195{
 196	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 197	struct omap_drm_private *priv = obj->dev->dev_private;
 198
 199	if (omap_obj->flags & OMAP_BO_TILED_MASK) {
 200		enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 201		int i;
 202
 203		for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
 204			struct omap_drm_usergart_entry *entry =
 205				&priv->usergart[fmt].entry[i];
 206
 207			if (entry->obj == obj)
 208				omap_gem_evict_entry(obj, fmt, entry);
 209		}
 210	}
 211}
 212
 213/* -----------------------------------------------------------------------------
 214 * Page Management
 215 */
 216
 217/*
 218 * Ensure backing pages are allocated. Must be called with the omap_obj.lock
 219 * held.
 220 */
 221static int omap_gem_attach_pages(struct drm_gem_object *obj)
 222{
 223	struct drm_device *dev = obj->dev;
 224	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 225	struct page **pages;
 226	int npages = obj->size >> PAGE_SHIFT;
 227	int i, ret;
 228	dma_addr_t *addrs;
 229
 230	lockdep_assert_held(&omap_obj->lock);
 231
 232	/*
 233	 * If not using shmem (in which case backing pages don't need to be
 234	 * allocated) or if pages are already allocated we're done.
 235	 */
 236	if (!(omap_obj->flags & OMAP_BO_MEM_SHMEM) || omap_obj->pages)
 237		return 0;
 238
 239	pages = drm_gem_get_pages(obj);
 240	if (IS_ERR(pages)) {
 241		dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
 242		return PTR_ERR(pages);
 243	}
 244
 245	/* for non-cached buffers, ensure the new pages are clean because
 246	 * DSS, GPU, etc. are not cache coherent:
 247	 */
 248	if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
 249		addrs = kmalloc_array(npages, sizeof(*addrs), GFP_KERNEL);
 250		if (!addrs) {
 251			ret = -ENOMEM;
 252			goto free_pages;
 253		}
 254
 255		for (i = 0; i < npages; i++) {
 256			addrs[i] = dma_map_page(dev->dev, pages[i],
 257					0, PAGE_SIZE, DMA_TO_DEVICE);
 258
 259			if (dma_mapping_error(dev->dev, addrs[i])) {
 260				dev_warn(dev->dev,
 261					"%s: failed to map page\n", __func__);
 262
 263				for (i = i - 1; i >= 0; --i) {
 264					dma_unmap_page(dev->dev, addrs[i],
 265						PAGE_SIZE, DMA_TO_DEVICE);
 266				}
 267
 268				ret = -ENOMEM;
 269				goto free_addrs;
 270			}
 271		}
 272	} else {
 273		addrs = kcalloc(npages, sizeof(*addrs), GFP_KERNEL);
 274		if (!addrs) {
 275			ret = -ENOMEM;
 276			goto free_pages;
 277		}
 278	}
 279
 280	omap_obj->dma_addrs = addrs;
 281	omap_obj->pages = pages;
 282
 283	return 0;
 284
 285free_addrs:
 286	kfree(addrs);
 287free_pages:
 288	drm_gem_put_pages(obj, pages, true, false);
 289
 290	return ret;
 291}
 292
 293/* Release backing pages. Must be called with the omap_obj.lock held. */
 294static void omap_gem_detach_pages(struct drm_gem_object *obj)
 295{
 296	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 297	unsigned int npages = obj->size >> PAGE_SHIFT;
 298	unsigned int i;
 299
 300	lockdep_assert_held(&omap_obj->lock);
 301
 302	for (i = 0; i < npages; i++) {
 303		if (omap_obj->dma_addrs[i])
 304			dma_unmap_page(obj->dev->dev, omap_obj->dma_addrs[i],
 305				       PAGE_SIZE, DMA_TO_DEVICE);
 306	}
 307
 308	kfree(omap_obj->dma_addrs);
 309	omap_obj->dma_addrs = NULL;
 310
 311	drm_gem_put_pages(obj, omap_obj->pages, true, false);
 312	omap_obj->pages = NULL;
 313}
 314
 315/* get buffer flags */
 316u32 omap_gem_flags(struct drm_gem_object *obj)
 317{
 318	return to_omap_bo(obj)->flags;
 319}
 320
 321/** get mmap size */
 322size_t omap_gem_mmap_size(struct drm_gem_object *obj)
 323{
 324	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 325	size_t size = obj->size;
 326
 327	if (omap_obj->flags & OMAP_BO_TILED_MASK) {
 328		/* for tiled buffers, the virtual size has stride rounded up
 329		 * to 4kb.. (to hide the fact that row n+1 might start 16kb or
 330		 * 32kb later!).  But we don't back the entire buffer with
 331		 * pages, only the valid picture part.. so need to adjust for
 332		 * this in the size used to mmap and generate mmap offset
 333		 */
 334		size = tiler_vsize(gem2fmt(omap_obj->flags),
 335				omap_obj->width, omap_obj->height);
 336	}
 337
 338	return size;
 339}
 340
 341/* -----------------------------------------------------------------------------
 342 * Fault Handling
 343 */
 344
 345/* Normal handling for the case of faulting in non-tiled buffers */
 346static vm_fault_t omap_gem_fault_1d(struct drm_gem_object *obj,
 347		struct vm_area_struct *vma, struct vm_fault *vmf)
 348{
 349	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 350	unsigned long pfn;
 351	pgoff_t pgoff;
 352
 353	/* We don't use vmf->pgoff since that has the fake offset: */
 354	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 355
 356	if (omap_obj->pages) {
 357		omap_gem_cpu_sync_page(obj, pgoff);
 358		pfn = page_to_pfn(omap_obj->pages[pgoff]);
 359	} else {
 360		BUG_ON(!omap_gem_is_contiguous(omap_obj));
 361		pfn = (omap_obj->dma_addr >> PAGE_SHIFT) + pgoff;
 362	}
 363
 364	VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 365			pfn, pfn << PAGE_SHIFT);
 366
 367	return vmf_insert_mixed(vma, vmf->address,
 368			__pfn_to_pfn_t(pfn, PFN_DEV));
 369}
 370
 371/* Special handling for the case of faulting in 2d tiled buffers */
 372static vm_fault_t omap_gem_fault_2d(struct drm_gem_object *obj,
 373		struct vm_area_struct *vma, struct vm_fault *vmf)
 374{
 375	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 376	struct omap_drm_private *priv = obj->dev->dev_private;
 377	struct omap_drm_usergart_entry *entry;
 378	enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 379	struct page *pages[64];  /* XXX is this too much to have on stack? */
 380	unsigned long pfn;
 381	pgoff_t pgoff, base_pgoff;
 382	unsigned long vaddr;
 383	int i, err, slots;
 384	vm_fault_t ret = VM_FAULT_NOPAGE;
 385
 386	/*
 387	 * Note the height of the slot is also equal to the number of pages
 388	 * that need to be mapped in to fill 4kb wide CPU page.  If the slot
 389	 * height is 64, then 64 pages fill a 4kb wide by 64 row region.
 390	 */
 391	const int n = priv->usergart[fmt].height;
 392	const int n_shift = priv->usergart[fmt].height_shift;
 393
 394	/*
 395	 * If buffer width in bytes > PAGE_SIZE then the virtual stride is
 396	 * rounded up to next multiple of PAGE_SIZE.. this need to be taken
 397	 * into account in some of the math, so figure out virtual stride
 398	 * in pages
 399	 */
 400	const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
 401
 402	/* We don't use vmf->pgoff since that has the fake offset: */
 403	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 404
 405	/*
 406	 * Actual address we start mapping at is rounded down to previous slot
 407	 * boundary in the y direction:
 408	 */
 409	base_pgoff = round_down(pgoff, m << n_shift);
 410
 411	/* figure out buffer width in slots */
 412	slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
 413
 414	vaddr = vmf->address - ((pgoff - base_pgoff) << PAGE_SHIFT);
 415
 416	entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
 417
 418	/* evict previous buffer using this usergart entry, if any: */
 419	if (entry->obj)
 420		omap_gem_evict_entry(entry->obj, fmt, entry);
 421
 422	entry->obj = obj;
 423	entry->obj_pgoff = base_pgoff;
 424
 425	/* now convert base_pgoff to phys offset from virt offset: */
 426	base_pgoff = (base_pgoff >> n_shift) * slots;
 427
 428	/* for wider-than 4k.. figure out which part of the slot-row we want: */
 429	if (m > 1) {
 430		int off = pgoff % m;
 431		entry->obj_pgoff += off;
 432		base_pgoff /= m;
 433		slots = min(slots - (off << n_shift), n);
 434		base_pgoff += off << n_shift;
 435		vaddr += off << PAGE_SHIFT;
 436	}
 437
 438	/*
 439	 * Map in pages. Beyond the valid pixel part of the buffer, we set
 440	 * pages[i] to NULL to get a dummy page mapped in.. if someone
 441	 * reads/writes it they will get random/undefined content, but at
 442	 * least it won't be corrupting whatever other random page used to
 443	 * be mapped in, or other undefined behavior.
 444	 */
 445	memcpy(pages, &omap_obj->pages[base_pgoff],
 446			sizeof(struct page *) * slots);
 447	memset(pages + slots, 0,
 448			sizeof(struct page *) * (n - slots));
 449
 450	err = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
 451	if (err) {
 452		ret = vmf_error(err);
 453		dev_err(obj->dev->dev, "failed to pin: %d\n", err);
 454		return ret;
 455	}
 456
 457	pfn = entry->dma_addr >> PAGE_SHIFT;
 458
 459	VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 460			pfn, pfn << PAGE_SHIFT);
 461
 462	for (i = n; i > 0; i--) {
 463		ret = vmf_insert_mixed(vma,
 464			vaddr, __pfn_to_pfn_t(pfn, PFN_DEV));
 465		if (ret & VM_FAULT_ERROR)
 466			break;
 467		pfn += priv->usergart[fmt].stride_pfn;
 468		vaddr += PAGE_SIZE * m;
 469	}
 470
 471	/* simple round-robin: */
 472	priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
 473				 % NUM_USERGART_ENTRIES;
 474
 475	return ret;
 476}
 477
 478/**
 479 * omap_gem_fault		-	pagefault handler for GEM objects
 480 * @vmf: fault detail
 481 *
 482 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
 483 * does most of the work for us including the actual map/unmap calls
 484 * but we need to do the actual page work.
 485 *
 486 * The VMA was set up by GEM. In doing so it also ensured that the
 487 * vma->vm_private_data points to the GEM object that is backing this
 488 * mapping.
 489 */
 490static vm_fault_t omap_gem_fault(struct vm_fault *vmf)
 491{
 492	struct vm_area_struct *vma = vmf->vma;
 493	struct drm_gem_object *obj = vma->vm_private_data;
 494	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 495	int err;
 496	vm_fault_t ret;
 497
 498	/* Make sure we don't parallel update on a fault, nor move or remove
 499	 * something from beneath our feet
 500	 */
 501	mutex_lock(&omap_obj->lock);
 502
 503	/* if a shmem backed object, make sure we have pages attached now */
 504	err = omap_gem_attach_pages(obj);
 505	if (err) {
 506		ret = vmf_error(err);
 507		goto fail;
 508	}
 509
 510	/* where should we do corresponding put_pages().. we are mapping
 511	 * the original page, rather than thru a GART, so we can't rely
 512	 * on eviction to trigger this.  But munmap() or all mappings should
 513	 * probably trigger put_pages()?
 514	 */
 515
 516	if (omap_obj->flags & OMAP_BO_TILED_MASK)
 517		ret = omap_gem_fault_2d(obj, vma, vmf);
 518	else
 519		ret = omap_gem_fault_1d(obj, vma, vmf);
 520
 521
 522fail:
 523	mutex_unlock(&omap_obj->lock);
 524	return ret;
 525}
 526
 527/** We override mainly to fix up some of the vm mapping flags.. */
 528int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 529{
 530	int ret;
 531
 532	ret = drm_gem_mmap(filp, vma);
 533	if (ret) {
 534		DBG("mmap failed: %d", ret);
 535		return ret;
 536	}
 537
 538	return omap_gem_mmap_obj(vma->vm_private_data, vma);
 539}
 540
 541int omap_gem_mmap_obj(struct drm_gem_object *obj,
 542		struct vm_area_struct *vma)
 543{
 544	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 545
 546	vma->vm_flags &= ~VM_PFNMAP;
 547	vma->vm_flags |= VM_MIXEDMAP;
 548
 549	if (omap_obj->flags & OMAP_BO_WC) {
 550		vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 551	} else if (omap_obj->flags & OMAP_BO_UNCACHED) {
 552		vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 553	} else {
 554		/*
 555		 * We do have some private objects, at least for scanout buffers
 556		 * on hardware without DMM/TILER.  But these are allocated write-
 557		 * combine
 558		 */
 559		if (WARN_ON(!obj->filp))
 560			return -EINVAL;
 561
 562		/*
 563		 * Shunt off cached objs to shmem file so they have their own
 564		 * address_space (so unmap_mapping_range does what we want,
 565		 * in particular in the case of mmap'd dmabufs)
 566		 */
 567		vma->vm_pgoff = 0;
 568		vma_set_file(vma, obj->filp);
 569
 570		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 571	}
 572
 573	return 0;
 574}
 575
 576/* -----------------------------------------------------------------------------
 577 * Dumb Buffers
 578 */
 579
 580/**
 581 * omap_gem_dumb_create	-	create a dumb buffer
 582 * @file: our client file
 583 * @dev: our device
 584 * @args: the requested arguments copied from userspace
 585 *
 586 * Allocate a buffer suitable for use for a frame buffer of the
 587 * form described by user space. Give userspace a handle by which
 588 * to reference it.
 589 */
 590int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 591		struct drm_mode_create_dumb *args)
 592{
 593	union omap_gem_size gsize;
 594
 595	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 596
 597	args->size = PAGE_ALIGN(args->pitch * args->height);
 598
 599	gsize = (union omap_gem_size){
 600		.bytes = args->size,
 601	};
 602
 603	return omap_gem_new_handle(dev, file, gsize,
 604			OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
 605}
 606
 607/**
 608 * omap_gem_dumb_map	-	buffer mapping for dumb interface
 609 * @file: our drm client file
 610 * @dev: drm device
 611 * @handle: GEM handle to the object (from dumb_create)
 612 * @offset: memory map offset placeholder
 613 *
 614 * Do the necessary setup to allow the mapping of the frame buffer
 615 * into user memory. We don't have to do much here at the moment.
 616 */
 617int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 618		u32 handle, u64 *offset)
 619{
 620	struct drm_gem_object *obj;
 621	int ret = 0;
 622
 623	/* GEM does all our handle to object mapping */
 624	obj = drm_gem_object_lookup(file, handle);
 625	if (obj == NULL) {
 626		ret = -ENOENT;
 627		goto fail;
 628	}
 629
 630	*offset = omap_gem_mmap_offset(obj);
 631
 632	drm_gem_object_put(obj);
 633
 634fail:
 635	return ret;
 636}
 637
 638#ifdef CONFIG_DRM_FBDEV_EMULATION
 639/* Set scrolling position.  This allows us to implement fast scrolling
 640 * for console.
 641 *
 642 * Call only from non-atomic contexts.
 643 */
 644int omap_gem_roll(struct drm_gem_object *obj, u32 roll)
 645{
 646	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 647	u32 npages = obj->size >> PAGE_SHIFT;
 648	int ret = 0;
 649
 650	if (roll > npages) {
 651		dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
 652		return -EINVAL;
 653	}
 654
 655	omap_obj->roll = roll;
 656
 657	mutex_lock(&omap_obj->lock);
 658
 659	/* if we aren't mapped yet, we don't need to do anything */
 660	if (omap_obj->block) {
 661		ret = omap_gem_attach_pages(obj);
 662		if (ret)
 663			goto fail;
 664
 665		ret = tiler_pin(omap_obj->block, omap_obj->pages, npages,
 666				roll, true);
 667		if (ret)
 668			dev_err(obj->dev->dev, "could not repin: %d\n", ret);
 669	}
 670
 671fail:
 672	mutex_unlock(&omap_obj->lock);
 673
 674	return ret;
 675}
 676#endif
 677
 678/* -----------------------------------------------------------------------------
 679 * Memory Management & DMA Sync
 680 */
 681
 682/*
 683 * shmem buffers that are mapped cached are not coherent.
 684 *
 685 * We keep track of dirty pages using page faulting to perform cache management.
 686 * When a page is mapped to the CPU in read/write mode the device can't access
 687 * it and omap_obj->dma_addrs[i] is NULL. When a page is mapped to the device
 688 * the omap_obj->dma_addrs[i] is set to the DMA address, and the page is
 689 * unmapped from the CPU.
 690 */
 691static inline bool omap_gem_is_cached_coherent(struct drm_gem_object *obj)
 692{
 693	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 694
 695	return !((omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
 696		((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED));
 697}
 698
 699/* Sync the buffer for CPU access.. note pages should already be
 700 * attached, ie. omap_gem_get_pages()
 701 */
 702void omap_gem_cpu_sync_page(struct drm_gem_object *obj, int pgoff)
 703{
 704	struct drm_device *dev = obj->dev;
 705	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 706
 707	if (omap_gem_is_cached_coherent(obj))
 708		return;
 709
 710	if (omap_obj->dma_addrs[pgoff]) {
 711		dma_unmap_page(dev->dev, omap_obj->dma_addrs[pgoff],
 712				PAGE_SIZE, DMA_TO_DEVICE);
 713		omap_obj->dma_addrs[pgoff] = 0;
 714	}
 715}
 716
 717/* sync the buffer for DMA access */
 718void omap_gem_dma_sync_buffer(struct drm_gem_object *obj,
 719		enum dma_data_direction dir)
 720{
 721	struct drm_device *dev = obj->dev;
 722	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 723	int i, npages = obj->size >> PAGE_SHIFT;
 724	struct page **pages = omap_obj->pages;
 725	bool dirty = false;
 726
 727	if (omap_gem_is_cached_coherent(obj))
 728		return;
 729
 730	for (i = 0; i < npages; i++) {
 731		if (!omap_obj->dma_addrs[i]) {
 732			dma_addr_t addr;
 733
 734			addr = dma_map_page(dev->dev, pages[i], 0,
 735					    PAGE_SIZE, dir);
 736			if (dma_mapping_error(dev->dev, addr)) {
 737				dev_warn(dev->dev, "%s: failed to map page\n",
 738					__func__);
 739				break;
 740			}
 741
 742			dirty = true;
 743			omap_obj->dma_addrs[i] = addr;
 744		}
 745	}
 746
 747	if (dirty) {
 748		unmap_mapping_range(obj->filp->f_mapping, 0,
 749				    omap_gem_mmap_size(obj), 1);
 750	}
 751}
 752
 753static int omap_gem_pin_tiler(struct drm_gem_object *obj)
 754{
 755	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 756	u32 npages = obj->size >> PAGE_SHIFT;
 757	enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 758	struct tiler_block *block;
 759	int ret;
 760
 761	BUG_ON(omap_obj->block);
 762
 763	if (omap_obj->flags & OMAP_BO_TILED_MASK) {
 764		block = tiler_reserve_2d(fmt, omap_obj->width, omap_obj->height,
 765					 PAGE_SIZE);
 766	} else {
 767		block = tiler_reserve_1d(obj->size);
 768	}
 769
 770	if (IS_ERR(block)) {
 771		ret = PTR_ERR(block);
 772		dev_err(obj->dev->dev, "could not remap: %d (%d)\n", ret, fmt);
 773		goto fail;
 774	}
 775
 776	/* TODO: enable async refill.. */
 777	ret = tiler_pin(block, omap_obj->pages, npages, omap_obj->roll, true);
 778	if (ret) {
 779		tiler_release(block);
 780		dev_err(obj->dev->dev, "could not pin: %d\n", ret);
 781		goto fail;
 782	}
 783
 784	omap_obj->dma_addr = tiler_ssptr(block);
 785	omap_obj->block = block;
 786
 787	DBG("got dma address: %pad", &omap_obj->dma_addr);
 788
 789fail:
 790	return ret;
 791}
 792
 793/**
 794 * omap_gem_pin() - Pin a GEM object in memory
 795 * @obj: the GEM object
 796 * @dma_addr: the DMA address
 797 *
 798 * Pin the given GEM object in memory and fill the dma_addr pointer with the
 799 * object's DMA address. If the buffer is not physically contiguous it will be
 800 * remapped through the TILER to provide a contiguous view.
 801 *
 802 * Pins are reference-counted, calling this function multiple times is allowed
 803 * as long the corresponding omap_gem_unpin() calls are balanced.
 804 *
 805 * Return 0 on success or a negative error code otherwise.
 806 */
 807int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr)
 808{
 809	struct omap_drm_private *priv = obj->dev->dev_private;
 810	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 811	int ret = 0;
 812
 813	mutex_lock(&omap_obj->lock);
 814
 815	if (!omap_gem_is_contiguous(omap_obj)) {
 816		if (refcount_read(&omap_obj->pin_cnt) == 0) {
 817
 818			refcount_set(&omap_obj->pin_cnt, 1);
 819
 820			ret = omap_gem_attach_pages(obj);
 821			if (ret)
 822				goto fail;
 823
 824			if (omap_obj->flags & OMAP_BO_SCANOUT) {
 825				if (priv->has_dmm) {
 826					ret = omap_gem_pin_tiler(obj);
 827					if (ret)
 828						goto fail;
 829				}
 830			}
 831		} else {
 832			refcount_inc(&omap_obj->pin_cnt);
 833		}
 834	}
 835
 836	if (dma_addr)
 837		*dma_addr = omap_obj->dma_addr;
 838
 839fail:
 840	mutex_unlock(&omap_obj->lock);
 841
 842	return ret;
 843}
 844
 845/**
 846 * omap_gem_unpin_locked() - Unpin a GEM object from memory
 847 * @obj: the GEM object
 848 *
 849 * omap_gem_unpin() without locking.
 850 */
 851static void omap_gem_unpin_locked(struct drm_gem_object *obj)
 852{
 853	struct omap_drm_private *priv = obj->dev->dev_private;
 854	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 855	int ret;
 856
 857	if (omap_gem_is_contiguous(omap_obj))
 858		return;
 859
 860	if (refcount_dec_and_test(&omap_obj->pin_cnt)) {
 861		if (omap_obj->sgt) {
 862			sg_free_table(omap_obj->sgt);
 863			kfree(omap_obj->sgt);
 864			omap_obj->sgt = NULL;
 865		}
 866		if (!(omap_obj->flags & OMAP_BO_SCANOUT))
 867			return;
 868		if (priv->has_dmm) {
 869			ret = tiler_unpin(omap_obj->block);
 870			if (ret) {
 871				dev_err(obj->dev->dev,
 872					"could not unpin pages: %d\n", ret);
 873			}
 874			ret = tiler_release(omap_obj->block);
 875			if (ret) {
 876				dev_err(obj->dev->dev,
 877					"could not release unmap: %d\n", ret);
 878			}
 879			omap_obj->dma_addr = 0;
 880			omap_obj->block = NULL;
 881		}
 882	}
 883}
 884
 885/**
 886 * omap_gem_unpin() - Unpin a GEM object from memory
 887 * @obj: the GEM object
 888 *
 889 * Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are
 890 * reference-counted, the actual unpin will only be performed when the number
 891 * of calls to this function matches the number of calls to omap_gem_pin().
 892 */
 893void omap_gem_unpin(struct drm_gem_object *obj)
 894{
 895	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 896
 897	mutex_lock(&omap_obj->lock);
 898	omap_gem_unpin_locked(obj);
 899	mutex_unlock(&omap_obj->lock);
 900}
 901
 902/* Get rotated scanout address (only valid if already pinned), at the
 903 * specified orientation and x,y offset from top-left corner of buffer
 904 * (only valid for tiled 2d buffers)
 905 */
 906int omap_gem_rotated_dma_addr(struct drm_gem_object *obj, u32 orient,
 907		int x, int y, dma_addr_t *dma_addr)
 908{
 909	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 910	int ret = -EINVAL;
 911
 912	mutex_lock(&omap_obj->lock);
 913
 914	if ((refcount_read(&omap_obj->pin_cnt) > 0) && omap_obj->block &&
 915			(omap_obj->flags & OMAP_BO_TILED_MASK)) {
 916		*dma_addr = tiler_tsptr(omap_obj->block, orient, x, y);
 917		ret = 0;
 918	}
 919
 920	mutex_unlock(&omap_obj->lock);
 921
 922	return ret;
 923}
 924
 925/* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
 926int omap_gem_tiled_stride(struct drm_gem_object *obj, u32 orient)
 927{
 928	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 929	int ret = -EINVAL;
 930	if (omap_obj->flags & OMAP_BO_TILED_MASK)
 931		ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
 932	return ret;
 933}
 934
 935/* if !remap, and we don't have pages backing, then fail, rather than
 936 * increasing the pin count (which we don't really do yet anyways,
 937 * because we don't support swapping pages back out).  And 'remap'
 938 * might not be quite the right name, but I wanted to keep it working
 939 * similarly to omap_gem_pin().  Note though that mutex is not
 940 * aquired if !remap (because this can be called in atomic ctxt),
 941 * but probably omap_gem_unpin() should be changed to work in the
 942 * same way.  If !remap, a matching omap_gem_put_pages() call is not
 943 * required (and should not be made).
 944 */
 945int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
 946		bool remap)
 947{
 948	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 949	int ret = 0;
 950
 951	mutex_lock(&omap_obj->lock);
 952
 953	if (remap) {
 954		ret = omap_gem_attach_pages(obj);
 955		if (ret)
 956			goto unlock;
 957	}
 958
 959	if (!omap_obj->pages) {
 960		ret = -ENOMEM;
 961		goto unlock;
 962	}
 963
 964	*pages = omap_obj->pages;
 965
 966unlock:
 967	mutex_unlock(&omap_obj->lock);
 968
 969	return ret;
 970}
 971
 972/* release pages when DMA no longer being performed */
 973int omap_gem_put_pages(struct drm_gem_object *obj)
 974{
 975	/* do something here if we dynamically attach/detach pages.. at
 976	 * least they would no longer need to be pinned if everyone has
 977	 * released the pages..
 978	 */
 979	return 0;
 980}
 981
 982struct sg_table *omap_gem_get_sg(struct drm_gem_object *obj,
 983		enum dma_data_direction dir)
 984{
 985	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 986	dma_addr_t addr;
 987	struct sg_table *sgt;
 988	struct scatterlist *sg;
 989	unsigned int count, len, stride, i;
 990	int ret;
 991
 992	ret = omap_gem_pin(obj, &addr);
 993	if (ret)
 994		return ERR_PTR(ret);
 995
 996	mutex_lock(&omap_obj->lock);
 997
 998	sgt = omap_obj->sgt;
 999	if (sgt)
1000		goto out;
1001
1002	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
1003	if (!sgt) {
1004		ret = -ENOMEM;
1005		goto err_unpin;
1006	}
1007
1008	if (addr) {
1009		if (omap_obj->flags & OMAP_BO_TILED_MASK) {
1010			enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
1011
1012			len = omap_obj->width << (int)fmt;
1013			count = omap_obj->height;
1014			stride = tiler_stride(fmt, 0);
1015		} else {
1016			len = obj->size;
1017			count = 1;
1018			stride = 0;
1019		}
1020	} else {
1021		count = obj->size >> PAGE_SHIFT;
1022	}
1023
1024	ret = sg_alloc_table(sgt, count, GFP_KERNEL);
1025	if (ret)
1026		goto err_free;
1027
1028	/* this must be after omap_gem_pin() to ensure we have pages attached */
1029	omap_gem_dma_sync_buffer(obj, dir);
1030
1031	if (addr) {
1032		for_each_sg(sgt->sgl, sg, count, i) {
1033			sg_set_page(sg, phys_to_page(addr), len,
1034				offset_in_page(addr));
1035			sg_dma_address(sg) = addr;
1036			sg_dma_len(sg) = len;
1037
1038			addr += stride;
1039		}
1040	} else {
1041		for_each_sg(sgt->sgl, sg, count, i) {
1042			sg_set_page(sg, omap_obj->pages[i], PAGE_SIZE, 0);
1043			sg_dma_address(sg) = omap_obj->dma_addrs[i];
1044			sg_dma_len(sg) =  PAGE_SIZE;
1045		}
1046	}
1047
1048	omap_obj->sgt = sgt;
1049out:
1050	mutex_unlock(&omap_obj->lock);
1051	return sgt;
1052
1053err_free:
1054	kfree(sgt);
1055err_unpin:
1056	mutex_unlock(&omap_obj->lock);
1057	omap_gem_unpin(obj);
1058	return ERR_PTR(ret);
1059}
1060
1061void omap_gem_put_sg(struct drm_gem_object *obj, struct sg_table *sgt)
1062{
1063	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1064
1065	if (WARN_ON(omap_obj->sgt != sgt))
1066		return;
1067
1068	omap_gem_unpin(obj);
1069}
1070
1071#ifdef CONFIG_DRM_FBDEV_EMULATION
1072/*
1073 * Get kernel virtual address for CPU access.. this more or less only
1074 * exists for omap_fbdev.
1075 */
1076void *omap_gem_vaddr(struct drm_gem_object *obj)
1077{
1078	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1079	void *vaddr;
1080	int ret;
1081
1082	mutex_lock(&omap_obj->lock);
1083
1084	if (!omap_obj->vaddr) {
1085		ret = omap_gem_attach_pages(obj);
1086		if (ret) {
1087			vaddr = ERR_PTR(ret);
1088			goto unlock;
1089		}
1090
1091		omap_obj->vaddr = vmap(omap_obj->pages, obj->size >> PAGE_SHIFT,
1092				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
1093	}
1094
1095	vaddr = omap_obj->vaddr;
1096
1097unlock:
1098	mutex_unlock(&omap_obj->lock);
1099	return vaddr;
1100}
1101#endif
1102
1103/* -----------------------------------------------------------------------------
1104 * Power Management
1105 */
1106
1107#ifdef CONFIG_PM
1108/* re-pin objects in DMM in resume path: */
1109int omap_gem_resume(struct drm_device *dev)
1110{
1111	struct omap_drm_private *priv = dev->dev_private;
1112	struct omap_gem_object *omap_obj;
1113	int ret = 0;
1114
1115	mutex_lock(&priv->list_lock);
1116	list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
1117		if (omap_obj->block) {
1118			struct drm_gem_object *obj = &omap_obj->base;
1119			u32 npages = obj->size >> PAGE_SHIFT;
1120
1121			WARN_ON(!omap_obj->pages);  /* this can't happen */
1122			ret = tiler_pin(omap_obj->block,
1123					omap_obj->pages, npages,
1124					omap_obj->roll, true);
1125			if (ret) {
1126				dev_err(dev->dev, "could not repin: %d\n", ret);
1127				goto done;
1128			}
1129		}
1130	}
1131
1132done:
1133	mutex_unlock(&priv->list_lock);
1134	return ret;
1135}
1136#endif
1137
1138/* -----------------------------------------------------------------------------
1139 * DebugFS
1140 */
1141
1142#ifdef CONFIG_DEBUG_FS
1143void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
1144{
1145	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1146	u64 off;
1147
1148	off = drm_vma_node_start(&obj->vma_node);
1149
1150	mutex_lock(&omap_obj->lock);
1151
1152	seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
1153			omap_obj->flags, obj->name, kref_read(&obj->refcount),
1154			off, &omap_obj->dma_addr,
1155			refcount_read(&omap_obj->pin_cnt),
1156			omap_obj->vaddr, omap_obj->roll);
1157
1158	if (omap_obj->flags & OMAP_BO_TILED_MASK) {
1159		seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
1160		if (omap_obj->block) {
1161			struct tcm_area *area = &omap_obj->block->area;
1162			seq_printf(m, " (%dx%d, %dx%d)",
1163					area->p0.x, area->p0.y,
1164					area->p1.x, area->p1.y);
1165		}
1166	} else {
1167		seq_printf(m, " %zu", obj->size);
1168	}
1169
1170	mutex_unlock(&omap_obj->lock);
1171
1172	seq_printf(m, "\n");
1173}
1174
1175void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
1176{
1177	struct omap_gem_object *omap_obj;
1178	int count = 0;
1179	size_t size = 0;
1180
1181	list_for_each_entry(omap_obj, list, mm_list) {
1182		struct drm_gem_object *obj = &omap_obj->base;
1183		seq_printf(m, "   ");
1184		omap_gem_describe(obj, m);
1185		count++;
1186		size += obj->size;
1187	}
1188
1189	seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
1190}
1191#endif
1192
1193/* -----------------------------------------------------------------------------
1194 * Constructor & Destructor
1195 */
1196
1197static void omap_gem_free_object(struct drm_gem_object *obj)
1198{
1199	struct drm_device *dev = obj->dev;
1200	struct omap_drm_private *priv = dev->dev_private;
1201	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1202
1203	omap_gem_evict(obj);
1204
1205	mutex_lock(&priv->list_lock);
1206	list_del(&omap_obj->mm_list);
1207	mutex_unlock(&priv->list_lock);
1208
1209	/*
1210	 * We own the sole reference to the object at this point, but to keep
1211	 * lockdep happy, we must still take the omap_obj_lock to call
1212	 * omap_gem_detach_pages(). This should hardly make any difference as
1213	 * there can't be any lock contention.
1214	 */
1215	mutex_lock(&omap_obj->lock);
1216
1217	/* The object should not be pinned. */
1218	WARN_ON(refcount_read(&omap_obj->pin_cnt) > 0);
1219
1220	if (omap_obj->pages) {
1221		if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
1222			kfree(omap_obj->pages);
1223		else
1224			omap_gem_detach_pages(obj);
1225	}
1226
1227	if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
1228		dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
1229			    omap_obj->dma_addr);
1230	} else if (omap_obj->vaddr) {
1231		vunmap(omap_obj->vaddr);
1232	} else if (obj->import_attach) {
1233		drm_prime_gem_destroy(obj, omap_obj->sgt);
1234	}
1235
1236	mutex_unlock(&omap_obj->lock);
1237
1238	drm_gem_object_release(obj);
1239
1240	mutex_destroy(&omap_obj->lock);
1241
1242	kfree(omap_obj);
1243}
1244
1245static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags)
1246{
1247	struct omap_drm_private *priv = dev->dev_private;
1248
1249	switch (flags & OMAP_BO_CACHE_MASK) {
1250	case OMAP_BO_CACHED:
1251	case OMAP_BO_WC:
1252	case OMAP_BO_CACHE_MASK:
1253		break;
1254
1255	default:
1256		return false;
1257	}
1258
1259	if (flags & OMAP_BO_TILED_MASK) {
1260		if (!priv->usergart)
1261			return false;
1262
1263		switch (flags & OMAP_BO_TILED_MASK) {
1264		case OMAP_BO_TILED_8:
1265		case OMAP_BO_TILED_16:
1266		case OMAP_BO_TILED_32:
1267			break;
1268
1269		default:
1270			return false;
1271		}
1272	}
1273
1274	return true;
1275}
1276
1277static const struct vm_operations_struct omap_gem_vm_ops = {
1278	.fault = omap_gem_fault,
1279	.open = drm_gem_vm_open,
1280	.close = drm_gem_vm_close,
1281};
1282
1283static const struct drm_gem_object_funcs omap_gem_object_funcs = {
1284	.free = omap_gem_free_object,
1285	.export = omap_gem_prime_export,
1286	.vm_ops = &omap_gem_vm_ops,
1287};
1288
1289/* GEM buffer object constructor */
1290struct drm_gem_object *omap_gem_new(struct drm_device *dev,
1291		union omap_gem_size gsize, u32 flags)
1292{
1293	struct omap_drm_private *priv = dev->dev_private;
1294	struct omap_gem_object *omap_obj;
1295	struct drm_gem_object *obj;
1296	struct address_space *mapping;
1297	size_t size;
1298	int ret;
1299
1300	if (!omap_gem_validate_flags(dev, flags))
1301		return NULL;
1302
1303	/* Validate the flags and compute the memory and cache flags. */
1304	if (flags & OMAP_BO_TILED_MASK) {
1305		/*
1306		 * Tiled buffers are always shmem paged backed. When they are
1307		 * scanned out, they are remapped into DMM/TILER.
1308		 */
1309		flags |= OMAP_BO_MEM_SHMEM;
1310
1311		/*
1312		 * Currently don't allow cached buffers. There is some caching
1313		 * stuff that needs to be handled better.
1314		 */
1315		flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
1316		flags |= tiler_get_cpu_cache_flags();
1317	} else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
1318		/*
1319		 * If we don't have DMM, we must allocate scanout buffers
1320		 * from contiguous DMA memory.
1321		 */
1322		flags |= OMAP_BO_MEM_DMA_API;
1323	} else if (!(flags & OMAP_BO_MEM_DMABUF)) {
1324		/*
1325		 * All other buffers not backed by dma_buf are shmem-backed.
1326		 */
1327		flags |= OMAP_BO_MEM_SHMEM;
1328	}
1329
1330	/* Allocate the initialize the OMAP GEM object. */
1331	omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
1332	if (!omap_obj)
1333		return NULL;
1334
1335	obj = &omap_obj->base;
1336	omap_obj->flags = flags;
1337	mutex_init(&omap_obj->lock);
1338
1339	if (flags & OMAP_BO_TILED_MASK) {
1340		/*
1341		 * For tiled buffers align dimensions to slot boundaries and
1342		 * calculate size based on aligned dimensions.
1343		 */
1344		tiler_align(gem2fmt(flags), &gsize.tiled.width,
1345			    &gsize.tiled.height);
1346
1347		size = tiler_size(gem2fmt(flags), gsize.tiled.width,
1348				  gsize.tiled.height);
1349
1350		omap_obj->width = gsize.tiled.width;
1351		omap_obj->height = gsize.tiled.height;
1352	} else {
1353		size = PAGE_ALIGN(gsize.bytes);
1354	}
1355
1356	obj->funcs = &omap_gem_object_funcs;
1357
1358	/* Initialize the GEM object. */
1359	if (!(flags & OMAP_BO_MEM_SHMEM)) {
1360		drm_gem_private_object_init(dev, obj, size);
1361	} else {
1362		ret = drm_gem_object_init(dev, obj, size);
1363		if (ret)
1364			goto err_free;
1365
1366		mapping = obj->filp->f_mapping;
1367		mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
1368	}
1369
1370	/* Allocate memory if needed. */
1371	if (flags & OMAP_BO_MEM_DMA_API) {
1372		omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
1373					       &omap_obj->dma_addr,
1374					       GFP_KERNEL);
1375		if (!omap_obj->vaddr)
1376			goto err_release;
1377	}
1378
1379	mutex_lock(&priv->list_lock);
1380	list_add(&omap_obj->mm_list, &priv->obj_list);
1381	mutex_unlock(&priv->list_lock);
1382
1383	return obj;
1384
1385err_release:
1386	drm_gem_object_release(obj);
1387err_free:
1388	kfree(omap_obj);
1389	return NULL;
1390}
1391
1392struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
1393					   struct sg_table *sgt)
1394{
1395	struct omap_drm_private *priv = dev->dev_private;
1396	struct omap_gem_object *omap_obj;
1397	struct drm_gem_object *obj;
1398	union omap_gem_size gsize;
1399
1400	/* Without a DMM only physically contiguous buffers can be supported. */
1401	if (sgt->orig_nents != 1 && !priv->has_dmm)
1402		return ERR_PTR(-EINVAL);
1403
1404	gsize.bytes = PAGE_ALIGN(size);
1405	obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
1406	if (!obj)
1407		return ERR_PTR(-ENOMEM);
1408
1409	omap_obj = to_omap_bo(obj);
1410
1411	mutex_lock(&omap_obj->lock);
1412
1413	omap_obj->sgt = sgt;
1414
1415	if (sgt->orig_nents == 1) {
1416		omap_obj->dma_addr = sg_dma_address(sgt->sgl);
1417	} else {
1418		/* Create pages list from sgt */
1419		struct page **pages;
1420		unsigned int npages;
1421		unsigned int ret;
1422
1423		npages = DIV_ROUND_UP(size, PAGE_SIZE);
1424		pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
1425		if (!pages) {
1426			omap_gem_free_object(obj);
1427			obj = ERR_PTR(-ENOMEM);
1428			goto done;
1429		}
1430
1431		omap_obj->pages = pages;
1432		ret = drm_prime_sg_to_page_array(sgt, pages, npages);
1433		if (ret) {
1434			omap_gem_free_object(obj);
1435			obj = ERR_PTR(-ENOMEM);
1436			goto done;
1437		}
1438	}
1439
1440done:
1441	mutex_unlock(&omap_obj->lock);
1442	return obj;
1443}
1444
1445/* convenience method to construct a GEM buffer object, and userspace handle */
1446int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
1447		union omap_gem_size gsize, u32 flags, u32 *handle)
1448{
1449	struct drm_gem_object *obj;
1450	int ret;
1451
1452	obj = omap_gem_new(dev, gsize, flags);
1453	if (!obj)
1454		return -ENOMEM;
1455
1456	ret = drm_gem_handle_create(file, obj, handle);
1457	if (ret) {
1458		omap_gem_free_object(obj);
1459		return ret;
1460	}
1461
1462	/* drop reference from allocate - handle holds it now */
1463	drm_gem_object_put(obj);
1464
1465	return 0;
1466}
1467
1468/* -----------------------------------------------------------------------------
1469 * Init & Cleanup
1470 */
1471
1472/* If DMM is used, we need to set some stuff up.. */
1473void omap_gem_init(struct drm_device *dev)
1474{
1475	struct omap_drm_private *priv = dev->dev_private;
1476	struct omap_drm_usergart *usergart;
1477	const enum tiler_fmt fmts[] = {
1478			TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
1479	};
1480	int i, j;
1481
1482	if (!dmm_is_available()) {
1483		/* DMM only supported on OMAP4 and later, so this isn't fatal */
1484		dev_warn(dev->dev, "DMM not available, disable DMM support\n");
1485		return;
1486	}
1487
1488	usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
1489	if (!usergart)
1490		return;
1491
1492	/* reserve 4k aligned/wide regions for userspace mappings: */
1493	for (i = 0; i < ARRAY_SIZE(fmts); i++) {
1494		u16 h = 1, w = PAGE_SIZE >> i;
1495
1496		tiler_align(fmts[i], &w, &h);
1497		/* note: since each region is 1 4kb page wide, and minimum
1498		 * number of rows, the height ends up being the same as the
1499		 * # of pages in the region
1500		 */
1501		usergart[i].height = h;
1502		usergart[i].height_shift = ilog2(h);
1503		usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
1504		usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
1505		for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
1506			struct omap_drm_usergart_entry *entry;
1507			struct tiler_block *block;
1508
1509			entry = &usergart[i].entry[j];
1510			block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
1511			if (IS_ERR(block)) {
1512				dev_err(dev->dev,
1513						"reserve failed: %d, %d, %ld\n",
1514						i, j, PTR_ERR(block));
1515				return;
1516			}
1517			entry->dma_addr = tiler_ssptr(block);
1518			entry->block = block;
1519
1520			DBG("%d:%d: %dx%d: dma_addr=%pad stride=%d", i, j, w, h,
1521					&entry->dma_addr,
1522					usergart[i].stride_pfn << PAGE_SHIFT);
1523		}
1524	}
1525
1526	priv->usergart = usergart;
1527	priv->has_dmm = true;
1528}
1529
1530void omap_gem_deinit(struct drm_device *dev)
1531{
1532	struct omap_drm_private *priv = dev->dev_private;
1533
1534	/* I believe we can rely on there being no more outstanding GEM
1535	 * objects which could depend on usergart/dmm at this point.
1536	 */
1537	kfree(priv->usergart);
1538}