1/*
   2 * drivers/gpu/drm/omapdrm/omap_gem.c
   3 *
   4 * Copyright (C) 2011 Texas Instruments
   5 * Author: Rob Clark <rob.clark@linaro.org>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License version 2 as published by
   9 * the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful, but WITHOUT
  12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14 * more details.
  15 *
  16 * You should have received a copy of the GNU General Public License along with
  17 * this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include <linux/seq_file.h>
  21#include <linux/shmem_fs.h>
  22#include <linux/spinlock.h>
  23#include <linux/pfn_t.h>
  24
 
 
  25#include <drm/drm_vma_manager.h>
  26
  27#include "omap_drv.h"
  28#include "omap_dmm_tiler.h"
  29
 
 
 
 
 
 
  30/*
  31 * GEM buffer object implementation.
  32 */
  33
 
 
  34/* note: we use upper 8 bits of flags for driver-internal flags: */
  35#define OMAP_BO_MEM_DMA_API	0x01000000	/* memory allocated with the dma_alloc_* API */
  36#define OMAP_BO_MEM_SHMEM	0x02000000	/* memory allocated through shmem backing */
  37#define OMAP_BO_MEM_DMABUF	0x08000000	/* memory imported from a dmabuf */
 
  38
  39struct omap_gem_object {
  40	struct drm_gem_object base;
  41
  42	struct list_head mm_list;
  43
  44	uint32_t flags;
  45
  46	/** width/height for tiled formats (rounded up to slot boundaries) */
  47	uint16_t width, height;
  48
  49	/** roll applied when mapping to DMM */
  50	uint32_t roll;
  51
  52	/**
  53	 * paddr contains the buffer DMA address. It is valid for
  54	 *
  55	 * - buffers allocated through the DMA mapping API (with the
  56	 *   OMAP_BO_MEM_DMA_API flag set)
  57	 *
  58	 * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
  59	 *   if they are physically contiguous (when sgt->orig_nents == 1)
  60	 *
  61	 * - buffers mapped through the TILER when paddr_cnt is not zero, in
  62	 *   which case the DMA address points to the TILER aperture
  63	 *
  64	 * Physically contiguous buffers have their DMA address equal to the
  65	 * physical address as we don't remap those buffers through the TILER.
  66	 *
  67	 * Buffers mapped to the TILER have their DMA address pointing to the
  68	 * TILER aperture. As TILER mappings are refcounted (through paddr_cnt)
  69	 * the DMA address must be accessed through omap_get_get_paddr() to
  70	 * ensure that the mapping won't disappear unexpectedly. References must
  71	 * be released with omap_gem_put_paddr().
  72	 */
  73	dma_addr_t paddr;
  74
  75	/**
  76	 * # of users of paddr
  77	 */
  78	uint32_t paddr_cnt;
  79
  80	/**
  81	 * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
  82	 * is set and the sgt field is valid.
  83	 */
  84	struct sg_table *sgt;
  85
  86	/**
  87	 * tiler block used when buffer is remapped in DMM/TILER.
  88	 */
  89	struct tiler_block *block;
  90
  91	/**
  92	 * Array of backing pages, if allocated.  Note that pages are never
  93	 * allocated for buffers originally allocated from contiguous memory
  94	 */
  95	struct page **pages;
  96
  97	/** addresses corresponding to pages in above array */
  98	dma_addr_t *addrs;
  99
 100	/**
 101	 * Virtual address, if mapped.
 102	 */
 103	void *vaddr;
 104
 105	/**
 106	 * sync-object allocated on demand (if needed)
 107	 *
 108	 * Per-buffer sync-object for tracking pending and completed hw/dma
 109	 * read and write operations.
 
 
 
 
 
 
 
 
 
 
 110	 */
 111	struct {
 112		uint32_t write_pending;
 113		uint32_t write_complete;
 114		uint32_t read_pending;
 115		uint32_t read_complete;
 116	} *sync;
 117};
 118
 119#define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
 
 120
 121/* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
 122 * not necessarily pinned in TILER all the time, and (b) when they are
 123 * they are not necessarily page aligned, we reserve one or more small
 124 * regions in each of the 2d containers to use as a user-GART where we
 125 * can create a second page-aligned mapping of parts of the buffer
 126 * being accessed from userspace.
 127 *
 128 * Note that we could optimize slightly when we know that multiple
 129 * tiler containers are backed by the same PAT.. but I'll leave that
 130 * for later..
 131 */
 132#define NUM_USERGART_ENTRIES 2
 133struct omap_drm_usergart_entry {
 134	struct tiler_block *block;	/* the reserved tiler block */
 135	dma_addr_t paddr;
 136	struct drm_gem_object *obj;	/* the current pinned obj */
 137	pgoff_t obj_pgoff;		/* page offset of obj currently
 138					   mapped in */
 139};
 140
 141struct omap_drm_usergart {
 142	struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
 143	int height;				/* height in rows */
 144	int height_shift;		/* ilog2(height in rows) */
 145	int slot_shift;			/* ilog2(width per slot) */
 146	int stride_pfn;			/* stride in pages */
 147	int last;				/* index of last used entry */
 148};
 149
 150/* -----------------------------------------------------------------------------
 151 * Helpers
 152 */
 153
 154/** get mmap offset */
 155static uint64_t mmap_offset(struct drm_gem_object *obj)
 156{
 157	struct drm_device *dev = obj->dev;
 158	int ret;
 159	size_t size;
 160
 161	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 162
 163	/* Make it mmapable */
 164	size = omap_gem_mmap_size(obj);
 165	ret = drm_gem_create_mmap_offset_size(obj, size);
 166	if (ret) {
 167		dev_err(dev->dev, "could not allocate mmap offset\n");
 168		return 0;
 169	}
 170
 171	return drm_vma_node_offset_addr(&obj->vma_node);
 172}
 173
 174static bool is_contiguous(struct omap_gem_object *omap_obj)
 175{
 176	if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
 177		return true;
 178
 179	if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1)
 180		return true;
 181
 182	return false;
 183}
 184
 185/* -----------------------------------------------------------------------------
 186 * Eviction
 187 */
 188
 189static void evict_entry(struct drm_gem_object *obj,
 190		enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
 191{
 192	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 193	struct omap_drm_private *priv = obj->dev->dev_private;
 194	int n = priv->usergart[fmt].height;
 195	size_t size = PAGE_SIZE * n;
 196	loff_t off = mmap_offset(obj) +
 197			(entry->obj_pgoff << PAGE_SHIFT);
 198	const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
 199
 200	if (m > 1) {
 201		int i;
 202		/* if stride > than PAGE_SIZE then sparse mapping: */
 203		for (i = n; i > 0; i--) {
 204			unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 205					    off, PAGE_SIZE, 1);
 206			off += PAGE_SIZE * m;
 207		}
 208	} else {
 209		unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 210				    off, size, 1);
 211	}
 212
 213	entry->obj = NULL;
 214}
 215
 216/* Evict a buffer from usergart, if it is mapped there */
 217static void evict(struct drm_gem_object *obj)
 218{
 219	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 220	struct omap_drm_private *priv = obj->dev->dev_private;
 221
 222	if (omap_obj->flags & OMAP_BO_TILED) {
 223		enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 224		int i;
 225
 226		for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
 227			struct omap_drm_usergart_entry *entry =
 228				&priv->usergart[fmt].entry[i];
 229
 
 
 230			if (entry->obj == obj)
 231				evict_entry(obj, fmt, entry);
 232		}
 233	}
 234}
 235
 236/* -----------------------------------------------------------------------------
 237 * Page Management
 
 
 
 
 
 
 
 
 
 
 
 
 
 238 */
 
 
 
 
 
 
 
 
 239
 240/** ensure backing pages are allocated */
 241static int omap_gem_attach_pages(struct drm_gem_object *obj)
 242{
 243	struct drm_device *dev = obj->dev;
 244	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 245	struct page **pages;
 246	int npages = obj->size >> PAGE_SHIFT;
 247	int i, ret;
 248	dma_addr_t *addrs;
 249
 250	WARN_ON(omap_obj->pages);
 251
 252	pages = drm_gem_get_pages(obj);
 
 
 
 
 253	if (IS_ERR(pages)) {
 254		dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
 255		return PTR_ERR(pages);
 256	}
 257
 258	/* for non-cached buffers, ensure the new pages are clean because
 259	 * DSS, GPU, etc. are not cache coherent:
 260	 */
 261	if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
 262		addrs = kmalloc(npages * sizeof(*addrs), GFP_KERNEL);
 263		if (!addrs) {
 264			ret = -ENOMEM;
 265			goto free_pages;
 266		}
 267
 268		for (i = 0; i < npages; i++) {
 269			addrs[i] = dma_map_page(dev->dev, pages[i],
 270					0, PAGE_SIZE, DMA_BIDIRECTIONAL);
 271
 272			if (dma_mapping_error(dev->dev, addrs[i])) {
 273				dev_warn(dev->dev,
 274					"%s: failed to map page\n", __func__);
 275
 276				for (i = i - 1; i >= 0; --i) {
 277					dma_unmap_page(dev->dev, addrs[i],
 278						PAGE_SIZE, DMA_BIDIRECTIONAL);
 279				}
 280
 281				ret = -ENOMEM;
 282				goto free_addrs;
 283			}
 284		}
 285	} else {
 286		addrs = kzalloc(npages * sizeof(*addrs), GFP_KERNEL);
 287		if (!addrs) {
 288			ret = -ENOMEM;
 289			goto free_pages;
 290		}
 291	}
 292
 293	omap_obj->addrs = addrs;
 294	omap_obj->pages = pages;
 295
 296	return 0;
 297
 298free_addrs:
 299	kfree(addrs);
 300free_pages:
 301	drm_gem_put_pages(obj, pages, true, false);
 302
 303	return ret;
 304}
 305
 306/* acquire pages when needed (for example, for DMA where physically
 307 * contiguous buffer is not required
 308 */
 309static int get_pages(struct drm_gem_object *obj, struct page ***pages)
 310{
 311	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 312	int ret = 0;
 313
 314	if ((omap_obj->flags & OMAP_BO_MEM_SHMEM) && !omap_obj->pages) {
 315		ret = omap_gem_attach_pages(obj);
 316		if (ret) {
 317			dev_err(obj->dev->dev, "could not attach pages\n");
 318			return ret;
 319		}
 320	}
 321
 322	/* TODO: even phys-contig.. we should have a list of pages? */
 323	*pages = omap_obj->pages;
 324
 325	return 0;
 326}
 327
 328/** release backing pages */
 329static void omap_gem_detach_pages(struct drm_gem_object *obj)
 330{
 331	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 332
 333	/* for non-cached buffers, ensure the new pages are clean because
 334	 * DSS, GPU, etc. are not cache coherent:
 335	 */
 336	if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
 337		int i, npages = obj->size >> PAGE_SHIFT;
 338		for (i = 0; i < npages; i++) {
 339			if (omap_obj->addrs[i])
 340				dma_unmap_page(obj->dev->dev,
 341					       omap_obj->addrs[i],
 342					       PAGE_SIZE, DMA_BIDIRECTIONAL);
 343		}
 344	}
 345
 346	kfree(omap_obj->addrs);
 347	omap_obj->addrs = NULL;
 348
 349	drm_gem_put_pages(obj, omap_obj->pages, true, false);
 350	omap_obj->pages = NULL;
 351}
 352
 353/* get buffer flags */
 354uint32_t omap_gem_flags(struct drm_gem_object *obj)
 355{
 356	return to_omap_bo(obj)->flags;
 357}
 358
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 359uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj)
 360{
 361	uint64_t offset;
 362	mutex_lock(&obj->dev->struct_mutex);
 363	offset = mmap_offset(obj);
 364	mutex_unlock(&obj->dev->struct_mutex);
 365	return offset;
 366}
 367
 368/** get mmap size */
 369size_t omap_gem_mmap_size(struct drm_gem_object *obj)
 370{
 371	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 372	size_t size = obj->size;
 373
 374	if (omap_obj->flags & OMAP_BO_TILED) {
 375		/* for tiled buffers, the virtual size has stride rounded up
 376		 * to 4kb.. (to hide the fact that row n+1 might start 16kb or
 377		 * 32kb later!).  But we don't back the entire buffer with
 378		 * pages, only the valid picture part.. so need to adjust for
 379		 * this in the size used to mmap and generate mmap offset
 380		 */
 381		size = tiler_vsize(gem2fmt(omap_obj->flags),
 382				omap_obj->width, omap_obj->height);
 383	}
 384
 385	return size;
 386}
 387
 388/* -----------------------------------------------------------------------------
 389 * Fault Handling
 390 */
 
 
 
 
 
 
 
 
 391
 392/* Normal handling for the case of faulting in non-tiled buffers */
 393static int fault_1d(struct drm_gem_object *obj,
 394		struct vm_area_struct *vma, struct vm_fault *vmf)
 395{
 396	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 397	unsigned long pfn;
 398	pgoff_t pgoff;
 399
 400	/* We don't use vmf->pgoff since that has the fake offset: */
 401	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
 402
 403	if (omap_obj->pages) {
 404		omap_gem_cpu_sync(obj, pgoff);
 405		pfn = page_to_pfn(omap_obj->pages[pgoff]);
 406	} else {
 407		BUG_ON(!is_contiguous(omap_obj));
 408		pfn = (omap_obj->paddr >> PAGE_SHIFT) + pgoff;
 409	}
 410
 411	VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 412			pfn, pfn << PAGE_SHIFT);
 413
 414	return vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
 415}
 416
 417/* Special handling for the case of faulting in 2d tiled buffers */
 418static int fault_2d(struct drm_gem_object *obj,
 419		struct vm_area_struct *vma, struct vm_fault *vmf)
 420{
 421	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 422	struct omap_drm_private *priv = obj->dev->dev_private;
 423	struct omap_drm_usergart_entry *entry;
 424	enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 425	struct page *pages[64];  /* XXX is this too much to have on stack? */
 426	unsigned long pfn;
 427	pgoff_t pgoff, base_pgoff;
 428	unsigned long vaddr;
 429	int i, ret, slots;
 430
 431	/*
 432	 * Note the height of the slot is also equal to the number of pages
 433	 * that need to be mapped in to fill 4kb wide CPU page.  If the slot
 434	 * height is 64, then 64 pages fill a 4kb wide by 64 row region.
 435	 */
 436	const int n = priv->usergart[fmt].height;
 437	const int n_shift = priv->usergart[fmt].height_shift;
 438
 439	/*
 440	 * If buffer width in bytes > PAGE_SIZE then the virtual stride is
 441	 * rounded up to next multiple of PAGE_SIZE.. this need to be taken
 442	 * into account in some of the math, so figure out virtual stride
 443	 * in pages
 444	 */
 445	const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
 446
 447	/* We don't use vmf->pgoff since that has the fake offset: */
 448	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
 449
 450	/*
 451	 * Actual address we start mapping at is rounded down to previous slot
 452	 * boundary in the y direction:
 453	 */
 454	base_pgoff = round_down(pgoff, m << n_shift);
 455
 456	/* figure out buffer width in slots */
 457	slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
 458
 459	vaddr = vmf->address - ((pgoff - base_pgoff) << PAGE_SHIFT);
 460
 461	entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
 462
 463	/* evict previous buffer using this usergart entry, if any: */
 464	if (entry->obj)
 465		evict_entry(entry->obj, fmt, entry);
 466
 467	entry->obj = obj;
 468	entry->obj_pgoff = base_pgoff;
 469
 470	/* now convert base_pgoff to phys offset from virt offset: */
 471	base_pgoff = (base_pgoff >> n_shift) * slots;
 472
 473	/* for wider-than 4k.. figure out which part of the slot-row we want: */
 474	if (m > 1) {
 475		int off = pgoff % m;
 476		entry->obj_pgoff += off;
 477		base_pgoff /= m;
 478		slots = min(slots - (off << n_shift), n);
 479		base_pgoff += off << n_shift;
 480		vaddr += off << PAGE_SHIFT;
 481	}
 482
 483	/*
 484	 * Map in pages. Beyond the valid pixel part of the buffer, we set
 485	 * pages[i] to NULL to get a dummy page mapped in.. if someone
 486	 * reads/writes it they will get random/undefined content, but at
 487	 * least it won't be corrupting whatever other random page used to
 488	 * be mapped in, or other undefined behavior.
 489	 */
 490	memcpy(pages, &omap_obj->pages[base_pgoff],
 491			sizeof(struct page *) * slots);
 492	memset(pages + slots, 0,
 493			sizeof(struct page *) * (n - slots));
 494
 495	ret = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
 496	if (ret) {
 497		dev_err(obj->dev->dev, "failed to pin: %d\n", ret);
 498		return ret;
 499	}
 500
 501	pfn = entry->paddr >> PAGE_SHIFT;
 502
 503	VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
 504			pfn, pfn << PAGE_SHIFT);
 505
 506	for (i = n; i > 0; i--) {
 507		vm_insert_mixed(vma, vaddr, __pfn_to_pfn_t(pfn, PFN_DEV));
 508		pfn += priv->usergart[fmt].stride_pfn;
 509		vaddr += PAGE_SIZE * m;
 510	}
 511
 512	/* simple round-robin: */
 513	priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
 514				 % NUM_USERGART_ENTRIES;
 515
 516	return 0;
 517}
 518
 519/**
 520 * omap_gem_fault		-	pagefault handler for GEM objects
 521 * @vma: the VMA of the GEM object
 522 * @vmf: fault detail
 523 *
 524 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
 525 * does most of the work for us including the actual map/unmap calls
 526 * but we need to do the actual page work.
 527 *
 528 * The VMA was set up by GEM. In doing so it also ensured that the
 529 * vma->vm_private_data points to the GEM object that is backing this
 530 * mapping.
 531 */
 532int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 533{
 534	struct drm_gem_object *obj = vma->vm_private_data;
 535	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 536	struct drm_device *dev = obj->dev;
 537	struct page **pages;
 538	int ret;
 539
 540	/* Make sure we don't parallel update on a fault, nor move or remove
 541	 * something from beneath our feet
 542	 */
 543	mutex_lock(&dev->struct_mutex);
 544
 545	/* if a shmem backed object, make sure we have pages attached now */
 546	ret = get_pages(obj, &pages);
 547	if (ret)
 548		goto fail;
 549
 550	/* where should we do corresponding put_pages().. we are mapping
 551	 * the original page, rather than thru a GART, so we can't rely
 552	 * on eviction to trigger this.  But munmap() or all mappings should
 553	 * probably trigger put_pages()?
 554	 */
 555
 556	if (omap_obj->flags & OMAP_BO_TILED)
 557		ret = fault_2d(obj, vma, vmf);
 558	else
 559		ret = fault_1d(obj, vma, vmf);
 560
 561
 562fail:
 563	mutex_unlock(&dev->struct_mutex);
 564	switch (ret) {
 565	case 0:
 566	case -ERESTARTSYS:
 567	case -EINTR:
 568	case -EBUSY:
 569		/*
 570		 * EBUSY is ok: this just means that another thread
 571		 * already did the job.
 572		 */
 573		return VM_FAULT_NOPAGE;
 574	case -ENOMEM:
 575		return VM_FAULT_OOM;
 576	default:
 577		return VM_FAULT_SIGBUS;
 578	}
 579}
 580
 581/** We override mainly to fix up some of the vm mapping flags.. */
 582int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 583{
 584	int ret;
 585
 586	ret = drm_gem_mmap(filp, vma);
 587	if (ret) {
 588		DBG("mmap failed: %d", ret);
 589		return ret;
 590	}
 591
 592	return omap_gem_mmap_obj(vma->vm_private_data, vma);
 593}
 594
 595int omap_gem_mmap_obj(struct drm_gem_object *obj,
 596		struct vm_area_struct *vma)
 597{
 598	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 599
 600	vma->vm_flags &= ~VM_PFNMAP;
 601	vma->vm_flags |= VM_MIXEDMAP;
 602
 603	if (omap_obj->flags & OMAP_BO_WC) {
 604		vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 605	} else if (omap_obj->flags & OMAP_BO_UNCACHED) {
 606		vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 607	} else {
 608		/*
 609		 * We do have some private objects, at least for scanout buffers
 610		 * on hardware without DMM/TILER.  But these are allocated write-
 611		 * combine
 612		 */
 613		if (WARN_ON(!obj->filp))
 614			return -EINVAL;
 615
 616		/*
 617		 * Shunt off cached objs to shmem file so they have their own
 618		 * address_space (so unmap_mapping_range does what we want,
 619		 * in particular in the case of mmap'd dmabufs)
 620		 */
 621		fput(vma->vm_file);
 622		vma->vm_pgoff = 0;
 623		vma->vm_file  = get_file(obj->filp);
 624
 625		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 626	}
 627
 628	return 0;
 629}
 630
 631/* -----------------------------------------------------------------------------
 632 * Dumb Buffers
 633 */
 634
 635/**
 636 * omap_gem_dumb_create	-	create a dumb buffer
 637 * @drm_file: our client file
 638 * @dev: our device
 639 * @args: the requested arguments copied from userspace
 640 *
 641 * Allocate a buffer suitable for use for a frame buffer of the
 642 * form described by user space. Give userspace a handle by which
 643 * to reference it.
 644 */
 645int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 646		struct drm_mode_create_dumb *args)
 647{
 648	union omap_gem_size gsize;
 649
 650	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 651
 652	args->size = PAGE_ALIGN(args->pitch * args->height);
 653
 654	gsize = (union omap_gem_size){
 655		.bytes = args->size,
 656	};
 657
 658	return omap_gem_new_handle(dev, file, gsize,
 659			OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
 660}
 661
 662/**
 663 * omap_gem_dumb_map	-	buffer mapping for dumb interface
 664 * @file: our drm client file
 665 * @dev: drm device
 666 * @handle: GEM handle to the object (from dumb_create)
 667 *
 668 * Do the necessary setup to allow the mapping of the frame buffer
 669 * into user memory. We don't have to do much here at the moment.
 670 */
 671int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 672		uint32_t handle, uint64_t *offset)
 673{
 674	struct drm_gem_object *obj;
 675	int ret = 0;
 676
 677	/* GEM does all our handle to object mapping */
 678	obj = drm_gem_object_lookup(file, handle);
 679	if (obj == NULL) {
 680		ret = -ENOENT;
 681		goto fail;
 682	}
 683
 684	*offset = omap_gem_mmap_offset(obj);
 685
 686	drm_gem_object_unreference_unlocked(obj);
 687
 688fail:
 689	return ret;
 690}
 691
 692#ifdef CONFIG_DRM_FBDEV_EMULATION
 693/* Set scrolling position.  This allows us to implement fast scrolling
 694 * for console.
 695 *
 696 * Call only from non-atomic contexts.
 697 */
 698int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll)
 699{
 700	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 701	uint32_t npages = obj->size >> PAGE_SHIFT;
 702	int ret = 0;
 703
 704	if (roll > npages) {
 705		dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
 706		return -EINVAL;
 707	}
 708
 709	omap_obj->roll = roll;
 710
 711	mutex_lock(&obj->dev->struct_mutex);
 712
 713	/* if we aren't mapped yet, we don't need to do anything */
 714	if (omap_obj->block) {
 715		struct page **pages;
 716		ret = get_pages(obj, &pages);
 717		if (ret)
 718			goto fail;
 719		ret = tiler_pin(omap_obj->block, pages, npages, roll, true);
 720		if (ret)
 721			dev_err(obj->dev->dev, "could not repin: %d\n", ret);
 722	}
 723
 724fail:
 725	mutex_unlock(&obj->dev->struct_mutex);
 726
 727	return ret;
 728}
 729#endif
 730
 731/* -----------------------------------------------------------------------------
 732 * Memory Management & DMA Sync
 733 */
 734
 735/**
 736 * shmem buffers that are mapped cached can simulate coherency via using
 737 * page faulting to keep track of dirty pages
 738 */
 739static inline bool is_cached_coherent(struct drm_gem_object *obj)
 740{
 741	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 742
 743	return (omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
 744		((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED);
 745}
 746
 747/* Sync the buffer for CPU access.. note pages should already be
 748 * attached, ie. omap_gem_get_pages()
 749 */
 750void omap_gem_cpu_sync(struct drm_gem_object *obj, int pgoff)
 751{
 752	struct drm_device *dev = obj->dev;
 753	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 754
 755	if (is_cached_coherent(obj) && omap_obj->addrs[pgoff]) {
 756		dma_unmap_page(dev->dev, omap_obj->addrs[pgoff],
 757				PAGE_SIZE, DMA_BIDIRECTIONAL);
 758		omap_obj->addrs[pgoff] = 0;
 759	}
 760}
 761
 762/* sync the buffer for DMA access */
 763void omap_gem_dma_sync(struct drm_gem_object *obj,
 764		enum dma_data_direction dir)
 765{
 766	struct drm_device *dev = obj->dev;
 767	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 768
 769	if (is_cached_coherent(obj)) {
 770		int i, npages = obj->size >> PAGE_SHIFT;
 771		struct page **pages = omap_obj->pages;
 772		bool dirty = false;
 773
 774		for (i = 0; i < npages; i++) {
 775			if (!omap_obj->addrs[i]) {
 776				dma_addr_t addr;
 777
 778				addr = dma_map_page(dev->dev, pages[i], 0,
 779						PAGE_SIZE, DMA_BIDIRECTIONAL);
 780
 781				if (dma_mapping_error(dev->dev, addr)) {
 782					dev_warn(dev->dev,
 783						"%s: failed to map page\n",
 784						__func__);
 785					break;
 786				}
 787
 788				dirty = true;
 789				omap_obj->addrs[i] = addr;
 790			}
 791		}
 792
 793		if (dirty) {
 794			unmap_mapping_range(obj->filp->f_mapping, 0,
 795					omap_gem_mmap_size(obj), 1);
 796		}
 797	}
 798}
 799
 800/* Get physical address for DMA.. if 'remap' is true, and the buffer is not
 801 * already contiguous, remap it to pin in physically contiguous memory.. (ie.
 802 * map in TILER)
 803 */
 804int omap_gem_get_paddr(struct drm_gem_object *obj,
 805		dma_addr_t *paddr, bool remap)
 806{
 807	struct omap_drm_private *priv = obj->dev->dev_private;
 808	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 809	int ret = 0;
 810
 811	mutex_lock(&obj->dev->struct_mutex);
 812
 813	if (!is_contiguous(omap_obj) && remap && priv->has_dmm) {
 814		if (omap_obj->paddr_cnt == 0) {
 815			struct page **pages;
 816			uint32_t npages = obj->size >> PAGE_SHIFT;
 817			enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 818			struct tiler_block *block;
 819
 820			BUG_ON(omap_obj->block);
 821
 822			ret = get_pages(obj, &pages);
 823			if (ret)
 824				goto fail;
 825
 826			if (omap_obj->flags & OMAP_BO_TILED) {
 827				block = tiler_reserve_2d(fmt,
 828						omap_obj->width,
 829						omap_obj->height, 0);
 830			} else {
 831				block = tiler_reserve_1d(obj->size);
 832			}
 833
 834			if (IS_ERR(block)) {
 835				ret = PTR_ERR(block);
 836				dev_err(obj->dev->dev,
 837					"could not remap: %d (%d)\n", ret, fmt);
 838				goto fail;
 839			}
 840
 841			/* TODO: enable async refill.. */
 842			ret = tiler_pin(block, pages, npages,
 843					omap_obj->roll, true);
 844			if (ret) {
 845				tiler_release(block);
 846				dev_err(obj->dev->dev,
 847						"could not pin: %d\n", ret);
 848				goto fail;
 849			}
 850
 851			omap_obj->paddr = tiler_ssptr(block);
 852			omap_obj->block = block;
 853
 854			DBG("got paddr: %pad", &omap_obj->paddr);
 855		}
 856
 857		omap_obj->paddr_cnt++;
 858
 859		*paddr = omap_obj->paddr;
 860	} else if (is_contiguous(omap_obj)) {
 861		*paddr = omap_obj->paddr;
 862	} else {
 863		ret = -EINVAL;
 864		goto fail;
 865	}
 866
 867fail:
 868	mutex_unlock(&obj->dev->struct_mutex);
 869
 870	return ret;
 871}
 872
 873/* Release physical address, when DMA is no longer being performed.. this
 874 * could potentially unpin and unmap buffers from TILER
 875 */
 876void omap_gem_put_paddr(struct drm_gem_object *obj)
 877{
 878	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 879	int ret;
 880
 881	mutex_lock(&obj->dev->struct_mutex);
 882	if (omap_obj->paddr_cnt > 0) {
 883		omap_obj->paddr_cnt--;
 884		if (omap_obj->paddr_cnt == 0) {
 885			ret = tiler_unpin(omap_obj->block);
 886			if (ret) {
 887				dev_err(obj->dev->dev,
 888					"could not unpin pages: %d\n", ret);
 
 889			}
 890			ret = tiler_release(omap_obj->block);
 891			if (ret) {
 892				dev_err(obj->dev->dev,
 893					"could not release unmap: %d\n", ret);
 894			}
 895			omap_obj->paddr = 0;
 896			omap_obj->block = NULL;
 897		}
 898	}
 899
 900	mutex_unlock(&obj->dev->struct_mutex);
 
 901}
 902
 903/* Get rotated scanout address (only valid if already pinned), at the
 904 * specified orientation and x,y offset from top-left corner of buffer
 905 * (only valid for tiled 2d buffers)
 906 */
 907int omap_gem_rotated_paddr(struct drm_gem_object *obj, uint32_t orient,
 908		int x, int y, dma_addr_t *paddr)
 909{
 910	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 911	int ret = -EINVAL;
 912
 913	mutex_lock(&obj->dev->struct_mutex);
 914	if ((omap_obj->paddr_cnt > 0) && omap_obj->block &&
 915			(omap_obj->flags & OMAP_BO_TILED)) {
 916		*paddr = tiler_tsptr(omap_obj->block, orient, x, y);
 917		ret = 0;
 918	}
 919	mutex_unlock(&obj->dev->struct_mutex);
 920	return ret;
 921}
 922
 923/* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
 924int omap_gem_tiled_stride(struct drm_gem_object *obj, uint32_t orient)
 925{
 926	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 927	int ret = -EINVAL;
 928	if (omap_obj->flags & OMAP_BO_TILED)
 929		ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
 930	return ret;
 931}
 932
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 933/* if !remap, and we don't have pages backing, then fail, rather than
 934 * increasing the pin count (which we don't really do yet anyways,
 935 * because we don't support swapping pages back out).  And 'remap'
 936 * might not be quite the right name, but I wanted to keep it working
 937 * similarly to omap_gem_get_paddr().  Note though that mutex is not
 938 * aquired if !remap (because this can be called in atomic ctxt),
 939 * but probably omap_gem_get_paddr() should be changed to work in the
 940 * same way.  If !remap, a matching omap_gem_put_pages() call is not
 941 * required (and should not be made).
 942 */
 943int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
 944		bool remap)
 945{
 946	int ret;
 947	if (!remap) {
 948		struct omap_gem_object *omap_obj = to_omap_bo(obj);
 949		if (!omap_obj->pages)
 950			return -ENOMEM;
 951		*pages = omap_obj->pages;
 952		return 0;
 953	}
 954	mutex_lock(&obj->dev->struct_mutex);
 955	ret = get_pages(obj, pages);
 956	mutex_unlock(&obj->dev->struct_mutex);
 957	return ret;
 958}
 959
 960/* release pages when DMA no longer being performed */
 961int omap_gem_put_pages(struct drm_gem_object *obj)
 962{
 963	/* do something here if we dynamically attach/detach pages.. at
 964	 * least they would no longer need to be pinned if everyone has
 965	 * released the pages..
 966	 */
 967	return 0;
 968}
 969
 970#ifdef CONFIG_DRM_FBDEV_EMULATION
 971/* Get kernel virtual address for CPU access.. this more or less only
 972 * exists for omap_fbdev.  This should be called with struct_mutex
 973 * held.
 974 */
 975void *omap_gem_vaddr(struct drm_gem_object *obj)
 976{
 977	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 978	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 979	if (!omap_obj->vaddr) {
 980		struct page **pages;
 981		int ret = get_pages(obj, &pages);
 982		if (ret)
 983			return ERR_PTR(ret);
 984		omap_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 985				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 986	}
 987	return omap_obj->vaddr;
 988}
 989#endif
 990
 991/* -----------------------------------------------------------------------------
 992 * Power Management
 993 */
 994
 995#ifdef CONFIG_PM
 996/* re-pin objects in DMM in resume path: */
 997int omap_gem_resume(struct device *dev)
 998{
 999	struct drm_device *drm_dev = dev_get_drvdata(dev);
1000	struct omap_drm_private *priv = drm_dev->dev_private;
1001	struct omap_gem_object *omap_obj;
1002	int ret = 0;
1003
1004	list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
1005		if (omap_obj->block) {
1006			struct drm_gem_object *obj = &omap_obj->base;
1007			uint32_t npages = obj->size >> PAGE_SHIFT;
1008			WARN_ON(!omap_obj->pages);  /* this can't happen */
1009			ret = tiler_pin(omap_obj->block,
1010					omap_obj->pages, npages,
1011					omap_obj->roll, true);
1012			if (ret) {
1013				dev_err(dev, "could not repin: %d\n", ret);
1014				return ret;
1015			}
1016		}
1017	}
1018
1019	return 0;
1020}
1021#endif
1022
1023/* -----------------------------------------------------------------------------
1024 * DebugFS
1025 */
1026
1027#ifdef CONFIG_DEBUG_FS
1028void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
1029{
1030	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1031	uint64_t off;
1032
1033	off = drm_vma_node_start(&obj->vma_node);
1034
1035	seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
1036			omap_obj->flags, obj->name, obj->refcount.refcount.counter,
1037			off, &omap_obj->paddr, omap_obj->paddr_cnt,
1038			omap_obj->vaddr, omap_obj->roll);
1039
1040	if (omap_obj->flags & OMAP_BO_TILED) {
1041		seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
1042		if (omap_obj->block) {
1043			struct tcm_area *area = &omap_obj->block->area;
1044			seq_printf(m, " (%dx%d, %dx%d)",
1045					area->p0.x, area->p0.y,
1046					area->p1.x, area->p1.y);
1047		}
1048	} else {
1049		seq_printf(m, " %d", obj->size);
1050	}
1051
1052	seq_printf(m, "\n");
1053}
1054
1055void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
1056{
1057	struct omap_gem_object *omap_obj;
1058	int count = 0;
1059	size_t size = 0;
1060
1061	list_for_each_entry(omap_obj, list, mm_list) {
1062		struct drm_gem_object *obj = &omap_obj->base;
1063		seq_printf(m, "   ");
1064		omap_gem_describe(obj, m);
1065		count++;
1066		size += obj->size;
1067	}
1068
1069	seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
1070}
1071#endif
1072
1073/* -----------------------------------------------------------------------------
1074 * Buffer Synchronization
1075 */
1076
1077static DEFINE_SPINLOCK(sync_lock);
1078
1079struct omap_gem_sync_waiter {
1080	struct list_head list;
1081	struct omap_gem_object *omap_obj;
1082	enum omap_gem_op op;
1083	uint32_t read_target, write_target;
1084	/* notify called w/ sync_lock held */
1085	void (*notify)(void *arg);
1086	void *arg;
1087};
1088
1089/* list of omap_gem_sync_waiter.. the notify fxn gets called back when
1090 * the read and/or write target count is achieved which can call a user
1091 * callback (ex. to kick 3d and/or 2d), wakeup blocked task (prep for
1092 * cpu access), etc.
1093 */
1094static LIST_HEAD(waiters);
1095
1096static inline bool is_waiting(struct omap_gem_sync_waiter *waiter)
1097{
1098	struct omap_gem_object *omap_obj = waiter->omap_obj;
1099	if ((waiter->op & OMAP_GEM_READ) &&
1100			(omap_obj->sync->write_complete < waiter->write_target))
1101		return true;
1102	if ((waiter->op & OMAP_GEM_WRITE) &&
1103			(omap_obj->sync->read_complete < waiter->read_target))
1104		return true;
1105	return false;
1106}
1107
1108/* macro for sync debug.. */
1109#define SYNCDBG 0
1110#define SYNC(fmt, ...) do { if (SYNCDBG) \
1111		printk(KERN_ERR "%s:%d: "fmt"\n", \
1112				__func__, __LINE__, ##__VA_ARGS__); \
1113	} while (0)
1114
1115
1116static void sync_op_update(void)
1117{
1118	struct omap_gem_sync_waiter *waiter, *n;
1119	list_for_each_entry_safe(waiter, n, &waiters, list) {
1120		if (!is_waiting(waiter)) {
1121			list_del(&waiter->list);
1122			SYNC("notify: %p", waiter);
1123			waiter->notify(waiter->arg);
1124			kfree(waiter);
1125		}
1126	}
1127}
1128
1129static inline int sync_op(struct drm_gem_object *obj,
1130		enum omap_gem_op op, bool start)
1131{
1132	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1133	int ret = 0;
1134
1135	spin_lock(&sync_lock);
1136
1137	if (!omap_obj->sync) {
1138		omap_obj->sync = kzalloc(sizeof(*omap_obj->sync), GFP_ATOMIC);
1139		if (!omap_obj->sync) {
1140			ret = -ENOMEM;
1141			goto unlock;
1142		}
1143	}
1144
1145	if (start) {
1146		if (op & OMAP_GEM_READ)
1147			omap_obj->sync->read_pending++;
1148		if (op & OMAP_GEM_WRITE)
1149			omap_obj->sync->write_pending++;
1150	} else {
1151		if (op & OMAP_GEM_READ)
1152			omap_obj->sync->read_complete++;
1153		if (op & OMAP_GEM_WRITE)
1154			omap_obj->sync->write_complete++;
1155		sync_op_update();
1156	}
1157
1158unlock:
1159	spin_unlock(&sync_lock);
1160
1161	return ret;
1162}
1163
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1164/* mark the start of read and/or write operation */
1165int omap_gem_op_start(struct drm_gem_object *obj, enum omap_gem_op op)
1166{
1167	return sync_op(obj, op, true);
1168}
1169
1170int omap_gem_op_finish(struct drm_gem_object *obj, enum omap_gem_op op)
1171{
1172	return sync_op(obj, op, false);
1173}
1174
1175static DECLARE_WAIT_QUEUE_HEAD(sync_event);
1176
1177static void sync_notify(void *arg)
1178{
1179	struct task_struct **waiter_task = arg;
1180	*waiter_task = NULL;
1181	wake_up_all(&sync_event);
1182}
1183
1184int omap_gem_op_sync(struct drm_gem_object *obj, enum omap_gem_op op)
1185{
1186	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1187	int ret = 0;
1188	if (omap_obj->sync) {
1189		struct task_struct *waiter_task = current;
1190		struct omap_gem_sync_waiter *waiter =
1191				kzalloc(sizeof(*waiter), GFP_KERNEL);
1192
1193		if (!waiter)
1194			return -ENOMEM;
1195
1196		waiter->omap_obj = omap_obj;
1197		waiter->op = op;
1198		waiter->read_target = omap_obj->sync->read_pending;
1199		waiter->write_target = omap_obj->sync->write_pending;
1200		waiter->notify = sync_notify;
1201		waiter->arg = &waiter_task;
1202
1203		spin_lock(&sync_lock);
1204		if (is_waiting(waiter)) {
1205			SYNC("waited: %p", waiter);
1206			list_add_tail(&waiter->list, &waiters);
1207			spin_unlock(&sync_lock);
1208			ret = wait_event_interruptible(sync_event,
1209					(waiter_task == NULL));
1210			spin_lock(&sync_lock);
1211			if (waiter_task) {
1212				SYNC("interrupted: %p", waiter);
1213				/* we were interrupted */
1214				list_del(&waiter->list);
1215				waiter_task = NULL;
1216			} else {
1217				/* freed in sync_op_update() */
1218				waiter = NULL;
1219			}
1220		}
1221		spin_unlock(&sync_lock);
1222		kfree(waiter);
 
 
1223	}
1224	return ret;
1225}
1226
1227/* call fxn(arg), either synchronously or asynchronously if the op
1228 * is currently blocked..  fxn() can be called from any context
1229 *
1230 * (TODO for now fxn is called back from whichever context calls
1231 * omap_gem_op_finish().. but this could be better defined later
1232 * if needed)
1233 *
1234 * TODO more code in common w/ _sync()..
1235 */
1236int omap_gem_op_async(struct drm_gem_object *obj, enum omap_gem_op op,
1237		void (*fxn)(void *arg), void *arg)
1238{
1239	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1240	if (omap_obj->sync) {
1241		struct omap_gem_sync_waiter *waiter =
1242				kzalloc(sizeof(*waiter), GFP_ATOMIC);
1243
1244		if (!waiter)
1245			return -ENOMEM;
1246
1247		waiter->omap_obj = omap_obj;
1248		waiter->op = op;
1249		waiter->read_target = omap_obj->sync->read_pending;
1250		waiter->write_target = omap_obj->sync->write_pending;
1251		waiter->notify = fxn;
1252		waiter->arg = arg;
1253
1254		spin_lock(&sync_lock);
1255		if (is_waiting(waiter)) {
1256			SYNC("waited: %p", waiter);
1257			list_add_tail(&waiter->list, &waiters);
1258			spin_unlock(&sync_lock);
1259			return 0;
1260		}
1261
1262		spin_unlock(&sync_lock);
1263
1264		kfree(waiter);
1265	}
1266
1267	/* no waiting.. */
1268	fxn(arg);
1269
1270	return 0;
1271}
1272
1273/* -----------------------------------------------------------------------------
1274 * Constructor & Destructor
 
 
1275 */
 
 
 
 
 
 
1276
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1277void omap_gem_free_object(struct drm_gem_object *obj)
1278{
1279	struct drm_device *dev = obj->dev;
1280	struct omap_drm_private *priv = dev->dev_private;
1281	struct omap_gem_object *omap_obj = to_omap_bo(obj);
1282
1283	evict(obj);
1284
1285	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
1286
1287	spin_lock(&priv->list_lock);
1288	list_del(&omap_obj->mm_list);
1289	spin_unlock(&priv->list_lock);
 
1290
1291	/* this means the object is still pinned.. which really should
1292	 * not happen.  I think..
1293	 */
1294	WARN_ON(omap_obj->paddr_cnt > 0);
1295
1296	if (omap_obj->pages) {
1297		if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
1298			kfree(omap_obj->pages);
1299		else
1300			omap_gem_detach_pages(obj);
1301	}
1302
1303	if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
1304		dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
1305			    omap_obj->paddr);
1306	} else if (omap_obj->vaddr) {
1307		vunmap(omap_obj->vaddr);
1308	} else if (obj->import_attach) {
1309		drm_prime_gem_destroy(obj, omap_obj->sgt);
1310	}
1311
1312	kfree(omap_obj->sync);
 
 
1313
1314	drm_gem_object_release(obj);
1315
1316	kfree(omap_obj);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1317}
1318
1319/* GEM buffer object constructor */
1320struct drm_gem_object *omap_gem_new(struct drm_device *dev,
1321		union omap_gem_size gsize, uint32_t flags)
1322{
1323	struct omap_drm_private *priv = dev->dev_private;
1324	struct omap_gem_object *omap_obj;
1325	struct drm_gem_object *obj;
1326	struct address_space *mapping;
1327	size_t size;
1328	int ret;
1329
1330	/* Validate the flags and compute the memory and cache flags. */
1331	if (flags & OMAP_BO_TILED) {
1332		if (!priv->usergart) {
1333			dev_err(dev->dev, "Tiled buffers require DMM\n");
1334			return NULL;
1335		}
1336
1337		/*
1338		 * Tiled buffers are always shmem paged backed. When they are
1339		 * scanned out, they are remapped into DMM/TILER.
1340		 */
1341		flags &= ~OMAP_BO_SCANOUT;
1342		flags |= OMAP_BO_MEM_SHMEM;
1343
1344		/*
1345		 * Currently don't allow cached buffers. There is some caching
1346		 * stuff that needs to be handled better.
1347		 */
1348		flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
1349		flags |= tiler_get_cpu_cache_flags();
1350	} else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
1351		/*
1352		 * OMAP_BO_SCANOUT hints that the buffer doesn't need to be
1353		 * tiled. However, to lower the pressure on memory allocation,
1354		 * use contiguous memory only if no TILER is available.
1355		 */
1356		flags |= OMAP_BO_MEM_DMA_API;
1357	} else if (!(flags & OMAP_BO_MEM_DMABUF)) {
1358		/*
1359		 * All other buffers not backed by dma_buf are shmem-backed.
1360		 */
1361		flags |= OMAP_BO_MEM_SHMEM;
 
 
 
 
 
 
1362	}
1363
1364	/* Allocate the initialize the OMAP GEM object. */
1365	omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
1366	if (!omap_obj)
1367		return NULL;
 
 
1368
1369	obj = &omap_obj->base;
1370	omap_obj->flags = flags;
1371
1372	if (flags & OMAP_BO_TILED) {
1373		/*
1374		 * For tiled buffers align dimensions to slot boundaries and
1375		 * calculate size based on aligned dimensions.
1376		 */
1377		tiler_align(gem2fmt(flags), &gsize.tiled.width,
1378			    &gsize.tiled.height);
 
 
1379
1380		size = tiler_size(gem2fmt(flags), gsize.tiled.width,
1381				  gsize.tiled.height);
1382
 
 
 
1383		omap_obj->width = gsize.tiled.width;
1384		omap_obj->height = gsize.tiled.height;
1385	} else {
1386		size = PAGE_ALIGN(gsize.bytes);
1387	}
1388
1389	/* Initialize the GEM object. */
1390	if (!(flags & OMAP_BO_MEM_SHMEM)) {
1391		drm_gem_private_object_init(dev, obj, size);
1392	} else {
1393		ret = drm_gem_object_init(dev, obj, size);
1394		if (ret)
1395			goto err_free;
1396
1397		mapping = obj->filp->f_mapping;
1398		mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
1399	}
1400
1401	/* Allocate memory if needed. */
1402	if (flags & OMAP_BO_MEM_DMA_API) {
1403		omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
1404					       &omap_obj->paddr,
1405					       GFP_KERNEL);
1406		if (!omap_obj->vaddr)
1407			goto err_release;
1408	}
1409
1410	spin_lock(&priv->list_lock);
1411	list_add(&omap_obj->mm_list, &priv->obj_list);
1412	spin_unlock(&priv->list_lock);
1413
1414	return obj;
1415
1416err_release:
1417	drm_gem_object_release(obj);
1418err_free:
1419	kfree(omap_obj);
1420	return NULL;
1421}
1422
1423struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
1424					   struct sg_table *sgt)
1425{
1426	struct omap_drm_private *priv = dev->dev_private;
1427	struct omap_gem_object *omap_obj;
1428	struct drm_gem_object *obj;
1429	union omap_gem_size gsize;
1430
1431	/* Without a DMM only physically contiguous buffers can be supported. */
1432	if (sgt->orig_nents != 1 && !priv->has_dmm)
1433		return ERR_PTR(-EINVAL);
1434
1435	mutex_lock(&dev->struct_mutex);
1436
1437	gsize.bytes = PAGE_ALIGN(size);
1438	obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
1439	if (!obj) {
1440		obj = ERR_PTR(-ENOMEM);
1441		goto done;
1442	}
1443
1444	omap_obj = to_omap_bo(obj);
1445	omap_obj->sgt = sgt;
1446
1447	if (sgt->orig_nents == 1) {
1448		omap_obj->paddr = sg_dma_address(sgt->sgl);
1449	} else {
1450		/* Create pages list from sgt */
1451		struct sg_page_iter iter;
1452		struct page **pages;
1453		unsigned int npages;
1454		unsigned int i = 0;
1455
1456		npages = DIV_ROUND_UP(size, PAGE_SIZE);
1457		pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
1458		if (!pages) {
1459			omap_gem_free_object(obj);
1460			obj = ERR_PTR(-ENOMEM);
1461			goto done;
1462		}
1463
1464		omap_obj->pages = pages;
1465
1466		for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
1467			pages[i++] = sg_page_iter_page(&iter);
1468			if (i > npages)
1469				break;
1470		}
1471
1472		if (WARN_ON(i != npages)) {
1473			omap_gem_free_object(obj);
1474			obj = ERR_PTR(-ENOMEM);
1475			goto done;
1476		}
1477	}
1478
1479done:
1480	mutex_unlock(&dev->struct_mutex);
1481	return obj;
1482}
1483
1484/* convenience method to construct a GEM buffer object, and userspace handle */
1485int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
1486		union omap_gem_size gsize, uint32_t flags, uint32_t *handle)
1487{
1488	struct drm_gem_object *obj;
1489	int ret;
1490
1491	obj = omap_gem_new(dev, gsize, flags);
1492	if (!obj)
1493		return -ENOMEM;
1494
1495	ret = drm_gem_handle_create(file, obj, handle);
1496	if (ret) {
1497		omap_gem_free_object(obj);
1498		return ret;
1499	}
1500
1501	/* drop reference from allocate - handle holds it now */
1502	drm_gem_object_unreference_unlocked(obj);
1503
1504	return 0;
1505}
1506
1507/* -----------------------------------------------------------------------------
1508 * Init & Cleanup
1509 */
1510
1511/* If DMM is used, we need to set some stuff up.. */
1512void omap_gem_init(struct drm_device *dev)
1513{
1514	struct omap_drm_private *priv = dev->dev_private;
1515	struct omap_drm_usergart *usergart;
1516	const enum tiler_fmt fmts[] = {
1517			TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
1518	};
1519	int i, j;
1520
1521	if (!dmm_is_available()) {
1522		/* DMM only supported on OMAP4 and later, so this isn't fatal */
1523		dev_warn(dev->dev, "DMM not available, disable DMM support\n");
1524		return;
1525	}
1526
1527	usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
1528	if (!usergart)
1529		return;
1530
1531	/* reserve 4k aligned/wide regions for userspace mappings: */
1532	for (i = 0; i < ARRAY_SIZE(fmts); i++) {
1533		uint16_t h = 1, w = PAGE_SIZE >> i;
1534		tiler_align(fmts[i], &w, &h);
1535		/* note: since each region is 1 4kb page wide, and minimum
1536		 * number of rows, the height ends up being the same as the
1537		 * # of pages in the region
1538		 */
1539		usergart[i].height = h;
1540		usergart[i].height_shift = ilog2(h);
1541		usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
1542		usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
1543		for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
1544			struct omap_drm_usergart_entry *entry;
1545			struct tiler_block *block;
1546
1547			entry = &usergart[i].entry[j];
1548			block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
1549			if (IS_ERR(block)) {
1550				dev_err(dev->dev,
1551						"reserve failed: %d, %d, %ld\n",
1552						i, j, PTR_ERR(block));
1553				return;
1554			}
1555			entry->paddr = tiler_ssptr(block);
1556			entry->block = block;
1557
1558			DBG("%d:%d: %dx%d: paddr=%pad stride=%d", i, j, w, h,
1559					&entry->paddr,
1560					usergart[i].stride_pfn << PAGE_SHIFT);
1561		}
1562	}
1563
1564	priv->usergart = usergart;
1565	priv->has_dmm = true;
1566}
1567
1568void omap_gem_deinit(struct drm_device *dev)
1569{
1570	struct omap_drm_private *priv = dev->dev_private;
1571
1572	/* I believe we can rely on there being no more outstanding GEM
1573	 * objects which could depend on usergart/dmm at this point.
1574	 */
1575	kfree(priv->usergart);
1576}