[deliverable/linux.git] / arch / s390 / pci / pci_dma.c

/*
 * Copyright IBM Corp. 2012
 *
 * Author(s):
 *   Jan Glauber <jang@linux.vnet.ibm.com>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/iommu-helper.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <linux/pci.h>
#include <asm/pci_dma.h>

static struct kmem_cache *dma_region_table_cache;
static struct kmem_cache *dma_page_table_cache;

static unsigned long *dma_alloc_cpu_table(void)
{
	unsigned long *table, *entry;

	table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC);
	if (!table)
		return NULL;

	for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
		*entry = ZPCI_TABLE_INVALID | ZPCI_TABLE_PROTECTED;
	return table;
}

static void dma_free_cpu_table(void *table)
{
	kmem_cache_free(dma_region_table_cache, table);
}

static unsigned long *dma_alloc_page_table(void)
{
	unsigned long *table, *entry;

	table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC);
	if (!table)
		return NULL;

	for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
		*entry = ZPCI_PTE_INVALID | ZPCI_TABLE_PROTECTED;
	return table;
}

static void dma_free_page_table(void *table)
{
	kmem_cache_free(dma_page_table_cache, table);
}

static unsigned long *dma_get_seg_table_origin(unsigned long *entry)
{
	unsigned long *sto;

	if (reg_entry_isvalid(*entry))
		sto = get_rt_sto(*entry);
	else {
		sto = dma_alloc_cpu_table();
		if (!sto)
			return NULL;

		set_rt_sto(entry, sto);
		validate_rt_entry(entry);
		entry_clr_protected(entry);
	}
	return sto;
}

static unsigned long *dma_get_page_table_origin(unsigned long *entry)
{
	unsigned long *pto;

	if (reg_entry_isvalid(*entry))
		pto = get_st_pto(*entry);
	else {
		pto = dma_alloc_page_table();
		if (!pto)
			return NULL;
		set_st_pto(entry, pto);
		validate_st_entry(entry);
		entry_clr_protected(entry);
	}
	return pto;
}

static unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr)
{
	unsigned long *sto, *pto;
	unsigned int rtx, sx, px;

	rtx = calc_rtx(dma_addr);
	sto = dma_get_seg_table_origin(&rto[rtx]);
	if (!sto)
		return NULL;

	sx = calc_sx(dma_addr);
	pto = dma_get_page_table_origin(&sto[sx]);
	if (!pto)
		return NULL;

	px = calc_px(dma_addr);
	return &pto[px];
}

static void dma_update_cpu_trans(struct zpci_dev *zdev, void *page_addr,
				 dma_addr_t dma_addr, int flags)
{
	unsigned long *entry;

	entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
	if (!entry) {
		WARN_ON_ONCE(1);
		return;
	}

	if (flags & ZPCI_PTE_INVALID) {
		invalidate_pt_entry(entry);
		return;
	} else {
		set_pt_pfaa(entry, page_addr);
		validate_pt_entry(entry);
	}

	if (flags & ZPCI_TABLE_PROTECTED)
		entry_set_protected(entry);
	else
		entry_clr_protected(entry);
}

static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa,
			    dma_addr_t dma_addr, size_t size, int flags)
{
	unsigned int nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
	u8 *page_addr = (u8 *) (pa & PAGE_MASK);
	dma_addr_t start_dma_addr = dma_addr;
	unsigned long irq_flags;
	int i, rc = 0;

	if (!nr_pages)
		return -EINVAL;

	spin_lock_irqsave(&zdev->dma_table_lock, irq_flags);
	if (!zdev->dma_table) {
		dev_err(&zdev->pdev->dev, "Missing DMA table\n");
		goto no_refresh;
	}

	for (i = 0; i < nr_pages; i++) {
		dma_update_cpu_trans(zdev, page_addr, dma_addr, flags);
		page_addr += PAGE_SIZE;
		dma_addr += PAGE_SIZE;
	}

	/*
	 * rpcit is not required to establish new translations when previously
	 * invalid translation-table entries are validated, however it is
	 * required when altering previously valid entries.
	 */
	if (!zdev->tlb_refresh &&
	    ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID))
		/*
		 * TODO: also need to check that the old entry is indeed INVALID
		 * and not only for one page but for the whole range...
		 * -> now we WARN_ON in that case but with lazy unmap that
		 * needs to be redone!
		 */
		goto no_refresh;

	rc = zpci_refresh_trans((u64) zdev->fh << 32, start_dma_addr,
				nr_pages * PAGE_SIZE);

no_refresh:
	spin_unlock_irqrestore(&zdev->dma_table_lock, irq_flags);
	return rc;
}

static void dma_free_seg_table(unsigned long entry)
{
	unsigned long *sto = get_rt_sto(entry);
	int sx;

	for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
		if (reg_entry_isvalid(sto[sx]))
			dma_free_page_table(get_st_pto(sto[sx]));

	dma_free_cpu_table(sto);
}

static void dma_cleanup_tables(struct zpci_dev *zdev)
{
	unsigned long *table;
	int rtx;

	if (!zdev || !zdev->dma_table)
		return;

	table = zdev->dma_table;
	for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
		if (reg_entry_isvalid(table[rtx]))
			dma_free_seg_table(table[rtx]);

	dma_free_cpu_table(table);
	zdev->dma_table = NULL;
}

static unsigned long __dma_alloc_iommu(struct zpci_dev *zdev, unsigned long start,
				   int size)
{
	unsigned long boundary_size = 0x1000000;

	return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages,
				start, size, 0, boundary_size, 0);
}

static unsigned long dma_alloc_iommu(struct zpci_dev *zdev, int size)
{
	unsigned long offset, flags;

	spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
	offset = __dma_alloc_iommu(zdev, zdev->next_bit, size);
	if (offset == -1)
		offset = __dma_alloc_iommu(zdev, 0, size);

	if (offset != -1) {
		zdev->next_bit = offset + size;
		if (zdev->next_bit >= zdev->iommu_pages)
			zdev->next_bit = 0;
	}
	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
	return offset;
}

static void dma_free_iommu(struct zpci_dev *zdev, unsigned long offset, int size)
{
	unsigned long flags;

	spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
	if (!zdev->iommu_bitmap)
		goto out;
	bitmap_clear(zdev->iommu_bitmap, offset, size);
	if (offset >= zdev->next_bit)
		zdev->next_bit = offset + size;
out:
	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
}

int dma_set_mask(struct device *dev, u64 mask)
{
	if (!dev->dma_mask || !dma_supported(dev, mask))
		return -EIO;

	*dev->dma_mask = mask;
	return 0;
}
EXPORT_SYMBOL_GPL(dma_set_mask);

static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
				     unsigned long offset, size_t size,
				     enum dma_data_direction direction,
				     struct dma_attrs *attrs)
{
	struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
	unsigned long nr_pages, iommu_page_index;
	unsigned long pa = page_to_phys(page) + offset;
	int flags = ZPCI_PTE_VALID;
	dma_addr_t dma_addr;

	/* This rounds up number of pages based on size and offset */
	nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
	iommu_page_index = dma_alloc_iommu(zdev, nr_pages);
	if (iommu_page_index == -1)
		goto out_err;

	/* Use rounded up size */
	size = nr_pages * PAGE_SIZE;

	dma_addr = zdev->start_dma + iommu_page_index * PAGE_SIZE;
	if (dma_addr + size > zdev->end_dma) {
		dev_err(dev, "(dma_addr: 0x%16.16LX + size: 0x%16.16lx) > end_dma: 0x%16.16Lx\n",
			 dma_addr, size, zdev->end_dma);
		goto out_free;
	}

	if (direction == DMA_NONE || direction == DMA_TO_DEVICE)
		flags |= ZPCI_TABLE_PROTECTED;

	if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) {
		atomic64_add(nr_pages, (atomic64_t *) &zdev->fmb->mapped_pages);
		return dma_addr + (offset & ~PAGE_MASK);
	}

out_free:
	dma_free_iommu(zdev, iommu_page_index, nr_pages);
out_err:
	dev_err(dev, "Failed to map addr: %lx\n", pa);
	return DMA_ERROR_CODE;
}

static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
				 size_t size, enum dma_data_direction direction,
				 struct dma_attrs *attrs)
{
	struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
	unsigned long iommu_page_index;
	int npages;

	npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
	dma_addr = dma_addr & PAGE_MASK;
	if (dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
			     ZPCI_TABLE_PROTECTED | ZPCI_PTE_INVALID))
		dev_err(dev, "Failed to unmap addr: %Lx\n", dma_addr);

	atomic64_add(npages, (atomic64_t *) &zdev->fmb->unmapped_pages);
	iommu_page_index = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;
	dma_free_iommu(zdev, iommu_page_index, npages);
}

static void *s390_dma_alloc(struct device *dev, size_t size,
			    dma_addr_t *dma_handle, gfp_t flag,
			    struct dma_attrs *attrs)
{
	struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
	struct page *page;
	unsigned long pa;
	dma_addr_t map;

	size = PAGE_ALIGN(size);
	page = alloc_pages(flag, get_order(size));
	if (!page)
		return NULL;

	atomic64_add(size / PAGE_SIZE, (atomic64_t *) &zdev->fmb->allocated_pages);
	pa = page_to_phys(page);
	memset((void *) pa, 0, size);

	map = s390_dma_map_pages(dev, page, pa % PAGE_SIZE,
				 size, DMA_BIDIRECTIONAL, NULL);
	if (dma_mapping_error(dev, map)) {
		free_pages(pa, get_order(size));
		return NULL;
	}

	if (dma_handle)
		*dma_handle = map;
	return (void *) pa;
}

static void s390_dma_free(struct device *dev, size_t size,
			  void *pa, dma_addr_t dma_handle,
			  struct dma_attrs *attrs)
{
	s390_dma_unmap_pages(dev, dma_handle, PAGE_ALIGN(size),
			     DMA_BIDIRECTIONAL, NULL);
	free_pages((unsigned long) pa, get_order(size));
}

static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
			   int nr_elements, enum dma_data_direction dir,
			   struct dma_attrs *attrs)
{
	int mapped_elements = 0;
	struct scatterlist *s;
	int i;

	for_each_sg(sg, s, nr_elements, i) {
		struct page *page = sg_page(s);
		s->dma_address = s390_dma_map_pages(dev, page, s->offset,
						    s->length, dir, NULL);
		if (!dma_mapping_error(dev, s->dma_address)) {
			s->dma_length = s->length;
			mapped_elements++;
		} else
			goto unmap;
	}
out:
	return mapped_elements;

unmap:
	for_each_sg(sg, s, mapped_elements, i) {
		if (s->dma_address)
			s390_dma_unmap_pages(dev, s->dma_address, s->dma_length,
					     dir, NULL);
		s->dma_address = 0;
		s->dma_length = 0;
	}
	mapped_elements = 0;
	goto out;
}

static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
			      int nr_elements, enum dma_data_direction dir,
			      struct dma_attrs *attrs)
{
	struct scatterlist *s;
	int i;

	for_each_sg(sg, s, nr_elements, i) {
		s390_dma_unmap_pages(dev, s->dma_address, s->dma_length, dir, NULL);
		s->dma_address = 0;
		s->dma_length = 0;
	}
}

int zpci_dma_init_device(struct zpci_dev *zdev)
{
	int rc;

	spin_lock_init(&zdev->iommu_bitmap_lock);
	spin_lock_init(&zdev->dma_table_lock);

	zdev->dma_table = dma_alloc_cpu_table();
	if (!zdev->dma_table) {
		rc = -ENOMEM;
		goto out_clean;
	}

	zdev->iommu_size = (unsigned long) high_memory - PAGE_OFFSET;
	zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT;
	zdev->iommu_bitmap = vzalloc(zdev->iommu_pages / 8);
	if (!zdev->iommu_bitmap) {
		rc = -ENOMEM;
		goto out_reg;
	}

	rc = zpci_register_ioat(zdev,
				0,
				zdev->start_dma + PAGE_OFFSET,
				zdev->start_dma + zdev->iommu_size - 1,
				(u64) zdev->dma_table);
	if (rc)
		goto out_reg;
	return 0;

out_reg:
	dma_free_cpu_table(zdev->dma_table);
out_clean:
	return rc;
}

void zpci_dma_exit_device(struct zpci_dev *zdev)
{
	zpci_unregister_ioat(zdev, 0);
	dma_cleanup_tables(zdev);
	vfree(zdev->iommu_bitmap);
	zdev->iommu_bitmap = NULL;
	zdev->next_bit = 0;
}

static int __init dma_alloc_cpu_table_caches(void)
{
	dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables",
					ZPCI_TABLE_SIZE, ZPCI_TABLE_ALIGN,
					0, NULL);
	if (!dma_region_table_cache)
		return -ENOMEM;

	dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables",
					ZPCI_PT_SIZE, ZPCI_PT_ALIGN,
					0, NULL);
	if (!dma_page_table_cache) {
		kmem_cache_destroy(dma_region_table_cache);
		return -ENOMEM;
	}
	return 0;
}

int __init zpci_dma_init(void)
{
	return dma_alloc_cpu_table_caches();
}

void zpci_dma_exit(void)
{
	kmem_cache_destroy(dma_page_table_cache);
	kmem_cache_destroy(dma_region_table_cache);
}

#define PREALLOC_DMA_DEBUG_ENTRIES	(1 << 16)

static int __init dma_debug_do_init(void)
{
	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
	return 0;
}
fs_initcall(dma_debug_do_init);

struct dma_map_ops s390_dma_ops = {
	.alloc		= s390_dma_alloc,
	.free		= s390_dma_free,
	.map_sg		= s390_dma_map_sg,
	.unmap_sg	= s390_dma_unmap_sg,
	.map_page	= s390_dma_map_pages,
	.unmap_page	= s390_dma_unmap_pages,
	/* if we support direct DMA this must be conditional */
	.is_phys	= 0,
	/* dma_supported is unconditionally true without a callback */
};
EXPORT_SYMBOL_GPL(s390_dma_ops);
Commit	Line	Data
828b35f6 JG	1	/*
	2	* Copyright IBM Corp. 2012
	3	*
	4	* Author(s):
	5	* Jan Glauber <jang@linux.vnet.ibm.com>
	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/slab.h>
	10	#include <linux/export.h>
	11	#include <linux/iommu-helper.h>
	12	#include <linux/dma-mapping.h>
22459321	13	#include <linux/vmalloc.h>
828b35f6 JG	14	#include <linux/pci.h>
	15	#include <asm/pci_dma.h>
	16
828b35f6 JG	17	static struct kmem_cache *dma_region_table_cache;
	18	static struct kmem_cache *dma_page_table_cache;
	19
	20	static unsigned long *dma_alloc_cpu_table(void)
	21	{
	22	unsigned long table, entry;
	23
	24	table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC);
	25	if (!table)
	26	return NULL;
	27
	28	for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
	29	*entry = ZPCI_TABLE_INVALID \| ZPCI_TABLE_PROTECTED;
	30	return table;
	31	}
	32
	33	static void dma_free_cpu_table(void *table)
	34	{
	35	kmem_cache_free(dma_region_table_cache, table);
	36	}
	37
	38	static unsigned long *dma_alloc_page_table(void)
	39	{
	40	unsigned long table, entry;
	41
	42	table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC);
	43	if (!table)
	44	return NULL;
	45
	46	for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
	47	*entry = ZPCI_PTE_INVALID \| ZPCI_TABLE_PROTECTED;
	48	return table;
	49	}
	50
	51	static void dma_free_page_table(void *table)
	52	{
	53	kmem_cache_free(dma_page_table_cache, table);
	54	}
	55
	56	static unsigned long dma_get_seg_table_origin(unsigned long entry)
	57	{
	58	unsigned long *sto;
	59
	60	if (reg_entry_isvalid(*entry))
	61	sto = get_rt_sto(*entry);
	62	else {
	63	sto = dma_alloc_cpu_table();
	64	if (!sto)
	65	return NULL;
	66
	67	set_rt_sto(entry, sto);
	68	validate_rt_entry(entry);
	69	entry_clr_protected(entry);
	70	}
	71	return sto;
	72	}
	73
	74	static unsigned long dma_get_page_table_origin(unsigned long entry)
	75	{
	76	unsigned long *pto;
	77
	78	if (reg_entry_isvalid(*entry))
	79	pto = get_st_pto(*entry);
	80	else {
81	pto = dma_alloc_page_table();
82	if (!pto)
83	return NULL;
84	set_st_pto(entry, pto);
85	validate_st_entry(entry);
86	entry_clr_protected(entry);
87	}
88	return pto;
89	}
90
91	static unsigned long dma_walk_cpu_trans(unsigned long rto, dma_addr_t dma_addr)
92	{
93	unsigned long sto, pto;
94	unsigned int rtx, sx, px;
95
96	rtx = calc_rtx(dma_addr);
97	sto = dma_get_seg_table_origin(&rto[rtx]);
98	if (!sto)
99	return NULL;
100
101	sx = calc_sx(dma_addr);
102	pto = dma_get_page_table_origin(&sto[sx]);
103	if (!pto)
104	return NULL;
105
106	px = calc_px(dma_addr);
107	return &pto[px];
108	}
109
110	static void dma_update_cpu_trans(struct zpci_dev zdev, void page_addr,
111	dma_addr_t dma_addr, int flags)
112	{
113	unsigned long *entry;
114
115	entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
116	if (!entry) {
117	WARN_ON_ONCE(1);
118	return;
119	}
120
121	if (flags & ZPCI_PTE_INVALID) {
122	invalidate_pt_entry(entry);
123	return;
124	} else {
125	set_pt_pfaa(entry, page_addr);
126	validate_pt_entry(entry);
127	}
128
129	if (flags & ZPCI_TABLE_PROTECTED)
130	entry_set_protected(entry);
131	else
132	entry_clr_protected(entry);
133	}
134
135	static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa,
136	dma_addr_t dma_addr, size_t size, int flags)
137	{
138	unsigned int nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
139	u8 page_addr = (u8 ) (pa & PAGE_MASK);
140	dma_addr_t start_dma_addr = dma_addr;
141	unsigned long irq_flags;
142	int i, rc = 0;
143
144	if (!nr_pages)
145	return -EINVAL;
146
147	spin_lock_irqsave(&zdev->dma_table_lock, irq_flags);
148	if (!zdev->dma_table) {
149	dev_err(&zdev->pdev->dev, "Missing DMA table\n");
150	goto no_refresh;
151	}
152
153	for (i = 0; i < nr_pages; i++) {
154	dma_update_cpu_trans(zdev, page_addr, dma_addr, flags);
155	page_addr += PAGE_SIZE;
156	dma_addr += PAGE_SIZE;
157	}
158
159	/*
160	* rpcit is not required to establish new translations when previously
161	* invalid translation-table entries are validated, however it is
162	* required when altering previously valid entries.
163	*/
164	if (!zdev->tlb_refresh &&
165	((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID))
166	/*
167	* TODO: also need to check that the old entry is indeed INVALID
168	* and not only for one page but for the whole range...
169	* -> now we WARN_ON in that case but with lazy unmap that
170	* needs to be redone!
171	*/
172	goto no_refresh;
b2a9e87d	173
9389339f MS	174	rc = zpci_refresh_trans((u64) zdev->fh << 32, start_dma_addr,
9389339f MS	175	nr_pages * PAGE_SIZE);
828b35f6 JG	176
	177	no_refresh:
	178	spin_unlock_irqrestore(&zdev->dma_table_lock, irq_flags);
	179	return rc;
	180	}
	181
	182	static void dma_free_seg_table(unsigned long entry)
	183	{
	184	unsigned long *sto = get_rt_sto(entry);
	185	int sx;
	186
	187	for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
	188	if (reg_entry_isvalid(sto[sx]))
	189	dma_free_page_table(get_st_pto(sto[sx]));
	190
	191	dma_free_cpu_table(sto);
	192	}
	193
	194	static void dma_cleanup_tables(struct zpci_dev *zdev)
	195	{
bafff174	196	unsigned long *table;
828b35f6 JG	197	int rtx;
	198
	199	if (!zdev \|\| !zdev->dma_table)
	200	return;
	201
bafff174	202	table = zdev->dma_table;
828b35f6 JG	203	for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
	204	if (reg_entry_isvalid(table[rtx]))
	205	dma_free_seg_table(table[rtx]);
	206
	207	dma_free_cpu_table(table);
	208	zdev->dma_table = NULL;
	209	}
	210
	211	static unsigned long __dma_alloc_iommu(struct zpci_dev *zdev, unsigned long start,
	212	int size)
	213	{
	214	unsigned long boundary_size = 0x1000000;
	215
	216	return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages,
	217	start, size, 0, boundary_size, 0);
	218	}
	219
	220	static unsigned long dma_alloc_iommu(struct zpci_dev *zdev, int size)
	221	{
	222	unsigned long offset, flags;
	223
	224	spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
	225	offset = __dma_alloc_iommu(zdev, zdev->next_bit, size);
	226	if (offset == -1)
	227	offset = __dma_alloc_iommu(zdev, 0, size);
	228
	229	if (offset != -1) {
	230	zdev->next_bit = offset + size;
	231	if (zdev->next_bit >= zdev->iommu_pages)
	232	zdev->next_bit = 0;
	233	}
	234	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
	235	return offset;
	236	}
	237
	238	static void dma_free_iommu(struct zpci_dev *zdev, unsigned long offset, int size)
	239	{
	240	unsigned long flags;
	241
	242	spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
	243	if (!zdev->iommu_bitmap)
	244	goto out;
	245	bitmap_clear(zdev->iommu_bitmap, offset, size);
	246	if (offset >= zdev->next_bit)
	247	zdev->next_bit = offset + size;
	248	out:
	249	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
	250	}
	251
	252	int dma_set_mask(struct device *dev, u64 mask)
	253	{
	254	if (!dev->dma_mask \|\| !dma_supported(dev, mask))
	255	return -EIO;
	256
	257	*dev->dma_mask = mask;
	258	return 0;
	259	}
	260	EXPORT_SYMBOL_GPL(dma_set_mask);
	261
	262	static dma_addr_t s390_dma_map_pages(struct device dev, struct page page,
	263	unsigned long offset, size_t size,
	264	enum dma_data_direction direction,
	265	struct dma_attrs *attrs)
	266	{
9294896e	267	struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
828b35f6 JG	268	unsigned long nr_pages, iommu_page_index;
	269	unsigned long pa = page_to_phys(page) + offset;
	270	int flags = ZPCI_PTE_VALID;
	271	dma_addr_t dma_addr;
	272
828b35f6 JG	273	/* This rounds up number of pages based on size and offset */
	274	nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
	275	iommu_page_index = dma_alloc_iommu(zdev, nr_pages);
	276	if (iommu_page_index == -1)
	277	goto out_err;
	278
	279	/* Use rounded up size */
	280	size = nr_pages * PAGE_SIZE;
	281
	282	dma_addr = zdev->start_dma + iommu_page_index * PAGE_SIZE;
	283	if (dma_addr + size > zdev->end_dma) {
	284	dev_err(dev, "(dma_addr: 0x%16.16LX + size: 0x%16.16lx) > end_dma: 0x%16.16Lx\n",
	285	dma_addr, size, zdev->end_dma);
	286	goto out_free;
	287	}
	288
	289	if (direction == DMA_NONE \|\| direction == DMA_TO_DEVICE)
	290	flags \|= ZPCI_TABLE_PROTECTED;
	291
d0b08853 JG	292	if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) {
d0b08853 JG	293	atomic64_add(nr_pages, (atomic64_t *) &zdev->fmb->mapped_pages);
186f50fa	294	return dma_addr + (offset & ~PAGE_MASK);
d0b08853	295	}
828b35f6 JG	296
	297	out_free:
	298	dma_free_iommu(zdev, iommu_page_index, nr_pages);
	299	out_err:
	300	dev_err(dev, "Failed to map addr: %lx\n", pa);
	301	return DMA_ERROR_CODE;
	302	}
	303
	304	static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
	305	size_t size, enum dma_data_direction direction,
	306	struct dma_attrs *attrs)
	307	{
9294896e	308	struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
828b35f6 JG	309	unsigned long iommu_page_index;
	310	int npages;
	311
	312	npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
	313	dma_addr = dma_addr & PAGE_MASK;
	314	if (dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
	315	ZPCI_TABLE_PROTECTED \| ZPCI_PTE_INVALID))
	316	dev_err(dev, "Failed to unmap addr: %Lx\n", dma_addr);
	317
d0b08853	318	atomic64_add(npages, (atomic64_t *) &zdev->fmb->unmapped_pages);
828b35f6 JG	319	iommu_page_index = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;
	320	dma_free_iommu(zdev, iommu_page_index, npages);
	321	}
	322
	323	static void s390_dma_alloc(struct device dev, size_t size,
	324	dma_addr_t *dma_handle, gfp_t flag,
	325	struct dma_attrs *attrs)
	326	{
9294896e	327	struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
828b35f6 JG	328	struct page *page;
	329	unsigned long pa;
	330	dma_addr_t map;
	331
	332	size = PAGE_ALIGN(size);
	333	page = alloc_pages(flag, get_order(size));
	334	if (!page)
	335	return NULL;
d0b08853 JG	336
d0b08853 JG	337	atomic64_add(size / PAGE_SIZE, (atomic64_t *) &zdev->fmb->allocated_pages);
828b35f6 JG	338	pa = page_to_phys(page);
	339	memset((void *) pa, 0, size);
	340
	341	map = s390_dma_map_pages(dev, page, pa % PAGE_SIZE,
	342	size, DMA_BIDIRECTIONAL, NULL);
	343	if (dma_mapping_error(dev, map)) {
	344	free_pages(pa, get_order(size));
	345	return NULL;
	346	}
	347
	348	if (dma_handle)
	349	*dma_handle = map;
	350	return (void *) pa;
	351	}
	352
	353	static void s390_dma_free(struct device *dev, size_t size,
	354	void *pa, dma_addr_t dma_handle,
	355	struct dma_attrs *attrs)
	356	{
	357	s390_dma_unmap_pages(dev, dma_handle, PAGE_ALIGN(size),
	358	DMA_BIDIRECTIONAL, NULL);
	359	free_pages((unsigned long) pa, get_order(size));
	360	}
	361
	362	static int s390_dma_map_sg(struct device dev, struct scatterlist sg,
	363	int nr_elements, enum dma_data_direction dir,
	364	struct dma_attrs *attrs)
	365	{
	366	int mapped_elements = 0;
	367	struct scatterlist *s;
	368	int i;
	369
	370	for_each_sg(sg, s, nr_elements, i) {
	371	struct page *page = sg_page(s);
	372	s->dma_address = s390_dma_map_pages(dev, page, s->offset,
	373	s->length, dir, NULL);
	374	if (!dma_mapping_error(dev, s->dma_address)) {
	375	s->dma_length = s->length;
	376	mapped_elements++;
	377	} else
	378	goto unmap;
	379	}
	380	out:
	381	return mapped_elements;
	382
	383	unmap:
	384	for_each_sg(sg, s, mapped_elements, i) {
	385	if (s->dma_address)
	386	s390_dma_unmap_pages(dev, s->dma_address, s->dma_length,
	387	dir, NULL);
	388	s->dma_address = 0;
	389	s->dma_length = 0;
	390	}
	391	mapped_elements = 0;
	392	goto out;
	393	}
	394
	395	static void s390_dma_unmap_sg(struct device dev, struct scatterlist sg,
	396	int nr_elements, enum dma_data_direction dir,
	397	struct dma_attrs *attrs)
	398	{
	399	struct scatterlist *s;
	400	int i;
	401
402	for_each_sg(sg, s, nr_elements, i) {
403	s390_dma_unmap_pages(dev, s->dma_address, s->dma_length, dir, NULL);
404	s->dma_address = 0;
405	s->dma_length = 0;
406	}
407	}
408
409	int zpci_dma_init_device(struct zpci_dev *zdev)
410	{
828b35f6 JG	411	int rc;
	412
	413	spin_lock_init(&zdev->iommu_bitmap_lock);
	414	spin_lock_init(&zdev->dma_table_lock);
	415
	416	zdev->dma_table = dma_alloc_cpu_table();
	417	if (!zdev->dma_table) {
	418	rc = -ENOMEM;
	419	goto out_clean;
	420	}
	421
	422	zdev->iommu_size = (unsigned long) high_memory - PAGE_OFFSET;
	423	zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT;
22459321	424	zdev->iommu_bitmap = vzalloc(zdev->iommu_pages / 8);
828b35f6 JG	425	if (!zdev->iommu_bitmap) {
	426	rc = -ENOMEM;
	427	goto out_reg;
	428	}
	429
	430	rc = zpci_register_ioat(zdev,
	431	0,
	432	zdev->start_dma + PAGE_OFFSET,
	433	zdev->start_dma + zdev->iommu_size - 1,
	434	(u64) zdev->dma_table);
	435	if (rc)
	436	goto out_reg;
	437	return 0;
	438
	439	out_reg:
	440	dma_free_cpu_table(zdev->dma_table);
	441	out_clean:
	442	return rc;
	443	}
	444
	445	void zpci_dma_exit_device(struct zpci_dev *zdev)
	446	{
	447	zpci_unregister_ioat(zdev, 0);
	448	dma_cleanup_tables(zdev);
22459321	449	vfree(zdev->iommu_bitmap);
828b35f6 JG	450	zdev->iommu_bitmap = NULL;
	451	zdev->next_bit = 0;
	452	}
	453
	454	static int __init dma_alloc_cpu_table_caches(void)
	455	{
	456	dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables",
	457	ZPCI_TABLE_SIZE, ZPCI_TABLE_ALIGN,
	458	0, NULL);
	459	if (!dma_region_table_cache)
	460	return -ENOMEM;
	461
	462	dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables",
	463	ZPCI_PT_SIZE, ZPCI_PT_ALIGN,
	464	0, NULL);
	465	if (!dma_page_table_cache) {
	466	kmem_cache_destroy(dma_region_table_cache);
	467	return -ENOMEM;
	468	}
	469	return 0;
	470	}
	471
	472	int __init zpci_dma_init(void)
	473	{
	474	return dma_alloc_cpu_table_caches();
	475	}
	476
	477	void zpci_dma_exit(void)
	478	{
	479	kmem_cache_destroy(dma_page_table_cache);
	480	kmem_cache_destroy(dma_region_table_cache);
	481	}
	482
	483	#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
	484
	485	static int __init dma_debug_do_init(void)
	486	{
	487	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
	488	return 0;
	489	}
	490	fs_initcall(dma_debug_do_init);
	491
	492	struct dma_map_ops s390_dma_ops = {
	493	.alloc = s390_dma_alloc,
	494	.free = s390_dma_free,
	495	.map_sg = s390_dma_map_sg,
	496	.unmap_sg = s390_dma_unmap_sg,
	497	.map_page = s390_dma_map_pages,
	498	.unmap_page = s390_dma_unmap_pages,
	499	/* if we support direct DMA this must be conditional */
	500	.is_phys = 0,
	501	/* dma_supported is unconditionally true without a callback */
	502	};
	503	EXPORT_SYMBOL_GPL(s390_dma_ops);