Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 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> |
Sebastian Ott | 2245932 | 2013-08-29 20:31:50 +0200 | [diff] [blame] | 13 | #include <linux/vmalloc.h> |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 14 | #include <linux/pci.h> |
| 15 | #include <asm/pci_dma.h> |
| 16 | |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 17 | static struct kmem_cache *dma_region_table_cache; |
| 18 | static struct kmem_cache *dma_page_table_cache; |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 19 | static int s390_iommu_strict; |
| 20 | |
| 21 | static int zpci_refresh_global(struct zpci_dev *zdev) |
| 22 | { |
| 23 | return zpci_refresh_trans((u64) zdev->fh << 32, zdev->start_dma, |
| 24 | zdev->iommu_pages * PAGE_SIZE); |
| 25 | } |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 26 | |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 27 | unsigned long *dma_alloc_cpu_table(void) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 28 | { |
| 29 | unsigned long *table, *entry; |
| 30 | |
| 31 | table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC); |
| 32 | if (!table) |
| 33 | return NULL; |
| 34 | |
| 35 | for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++) |
| 36 | *entry = ZPCI_TABLE_INVALID | ZPCI_TABLE_PROTECTED; |
| 37 | return table; |
| 38 | } |
| 39 | |
| 40 | static void dma_free_cpu_table(void *table) |
| 41 | { |
| 42 | kmem_cache_free(dma_region_table_cache, table); |
| 43 | } |
| 44 | |
| 45 | static unsigned long *dma_alloc_page_table(void) |
| 46 | { |
| 47 | unsigned long *table, *entry; |
| 48 | |
| 49 | table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC); |
| 50 | if (!table) |
| 51 | return NULL; |
| 52 | |
| 53 | for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++) |
| 54 | *entry = ZPCI_PTE_INVALID | ZPCI_TABLE_PROTECTED; |
| 55 | return table; |
| 56 | } |
| 57 | |
| 58 | static void dma_free_page_table(void *table) |
| 59 | { |
| 60 | kmem_cache_free(dma_page_table_cache, table); |
| 61 | } |
| 62 | |
| 63 | static unsigned long *dma_get_seg_table_origin(unsigned long *entry) |
| 64 | { |
| 65 | unsigned long *sto; |
| 66 | |
| 67 | if (reg_entry_isvalid(*entry)) |
| 68 | sto = get_rt_sto(*entry); |
| 69 | else { |
| 70 | sto = dma_alloc_cpu_table(); |
| 71 | if (!sto) |
| 72 | return NULL; |
| 73 | |
| 74 | set_rt_sto(entry, sto); |
| 75 | validate_rt_entry(entry); |
| 76 | entry_clr_protected(entry); |
| 77 | } |
| 78 | return sto; |
| 79 | } |
| 80 | |
| 81 | static unsigned long *dma_get_page_table_origin(unsigned long *entry) |
| 82 | { |
| 83 | unsigned long *pto; |
| 84 | |
| 85 | if (reg_entry_isvalid(*entry)) |
| 86 | pto = get_st_pto(*entry); |
| 87 | else { |
| 88 | pto = dma_alloc_page_table(); |
| 89 | if (!pto) |
| 90 | return NULL; |
| 91 | set_st_pto(entry, pto); |
| 92 | validate_st_entry(entry); |
| 93 | entry_clr_protected(entry); |
| 94 | } |
| 95 | return pto; |
| 96 | } |
| 97 | |
| 98 | static unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr) |
| 99 | { |
| 100 | unsigned long *sto, *pto; |
| 101 | unsigned int rtx, sx, px; |
| 102 | |
| 103 | rtx = calc_rtx(dma_addr); |
| 104 | sto = dma_get_seg_table_origin(&rto[rtx]); |
| 105 | if (!sto) |
| 106 | return NULL; |
| 107 | |
| 108 | sx = calc_sx(dma_addr); |
| 109 | pto = dma_get_page_table_origin(&sto[sx]); |
| 110 | if (!pto) |
| 111 | return NULL; |
| 112 | |
| 113 | px = calc_px(dma_addr); |
| 114 | return &pto[px]; |
| 115 | } |
| 116 | |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 117 | void dma_update_cpu_trans(unsigned long *dma_table, void *page_addr, |
| 118 | dma_addr_t dma_addr, int flags) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 119 | { |
| 120 | unsigned long *entry; |
| 121 | |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 122 | entry = dma_walk_cpu_trans(dma_table, dma_addr); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 123 | if (!entry) { |
| 124 | WARN_ON_ONCE(1); |
| 125 | return; |
| 126 | } |
| 127 | |
| 128 | if (flags & ZPCI_PTE_INVALID) { |
| 129 | invalidate_pt_entry(entry); |
| 130 | return; |
| 131 | } else { |
| 132 | set_pt_pfaa(entry, page_addr); |
| 133 | validate_pt_entry(entry); |
| 134 | } |
| 135 | |
| 136 | if (flags & ZPCI_TABLE_PROTECTED) |
| 137 | entry_set_protected(entry); |
| 138 | else |
| 139 | entry_clr_protected(entry); |
| 140 | } |
| 141 | |
| 142 | static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa, |
| 143 | dma_addr_t dma_addr, size_t size, int flags) |
| 144 | { |
| 145 | unsigned int nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; |
| 146 | u8 *page_addr = (u8 *) (pa & PAGE_MASK); |
| 147 | dma_addr_t start_dma_addr = dma_addr; |
| 148 | unsigned long irq_flags; |
| 149 | int i, rc = 0; |
| 150 | |
| 151 | if (!nr_pages) |
| 152 | return -EINVAL; |
| 153 | |
| 154 | spin_lock_irqsave(&zdev->dma_table_lock, irq_flags); |
Sebastian Ott | 1f1dcbd | 2013-10-22 15:17:19 +0200 | [diff] [blame] | 155 | if (!zdev->dma_table) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 156 | goto no_refresh; |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 157 | |
| 158 | for (i = 0; i < nr_pages; i++) { |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 159 | dma_update_cpu_trans(zdev->dma_table, page_addr, dma_addr, |
| 160 | flags); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 161 | page_addr += PAGE_SIZE; |
| 162 | dma_addr += PAGE_SIZE; |
| 163 | } |
| 164 | |
| 165 | /* |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 166 | * With zdev->tlb_refresh == 0, rpcit is not required to establish new |
| 167 | * translations when previously invalid translation-table entries are |
| 168 | * validated. With lazy unmap, it also is skipped for previously valid |
| 169 | * entries, but a global rpcit is then required before any address can |
| 170 | * be re-used, i.e. after each iommu bitmap wrap-around. |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 171 | */ |
| 172 | if (!zdev->tlb_refresh && |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 173 | (!s390_iommu_strict || |
| 174 | ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID))) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 175 | goto no_refresh; |
Sebastian Ott | b2a9e87 | 2013-04-16 14:15:42 +0200 | [diff] [blame] | 176 | |
Martin Schwidefsky | 9389339 | 2013-06-25 14:52:23 +0200 | [diff] [blame] | 177 | rc = zpci_refresh_trans((u64) zdev->fh << 32, start_dma_addr, |
| 178 | nr_pages * PAGE_SIZE); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 179 | |
| 180 | no_refresh: |
| 181 | spin_unlock_irqrestore(&zdev->dma_table_lock, irq_flags); |
| 182 | return rc; |
| 183 | } |
| 184 | |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 185 | void dma_free_seg_table(unsigned long entry) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 186 | { |
| 187 | unsigned long *sto = get_rt_sto(entry); |
| 188 | int sx; |
| 189 | |
| 190 | for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++) |
| 191 | if (reg_entry_isvalid(sto[sx])) |
| 192 | dma_free_page_table(get_st_pto(sto[sx])); |
| 193 | |
| 194 | dma_free_cpu_table(sto); |
| 195 | } |
| 196 | |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 197 | void dma_cleanup_tables(unsigned long *table) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 198 | { |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 199 | int rtx; |
| 200 | |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 201 | if (!table) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 202 | return; |
| 203 | |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 204 | for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++) |
| 205 | if (reg_entry_isvalid(table[rtx])) |
| 206 | dma_free_seg_table(table[rtx]); |
| 207 | |
| 208 | dma_free_cpu_table(table); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 209 | } |
| 210 | |
Gerald Schaefer | 5ec6d49 | 2014-02-18 19:47:17 +0100 | [diff] [blame] | 211 | static unsigned long __dma_alloc_iommu(struct zpci_dev *zdev, |
| 212 | unsigned long start, int size) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 213 | { |
Gerald Schaefer | 5ec6d49 | 2014-02-18 19:47:17 +0100 | [diff] [blame] | 214 | unsigned long boundary_size; |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 215 | |
Gerald Schaefer | 5ec6d49 | 2014-02-18 19:47:17 +0100 | [diff] [blame] | 216 | boundary_size = ALIGN(dma_get_seg_boundary(&zdev->pdev->dev) + 1, |
| 217 | PAGE_SIZE) >> PAGE_SHIFT; |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 218 | return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages, |
| 219 | start, size, 0, boundary_size, 0); |
| 220 | } |
| 221 | |
| 222 | static unsigned long dma_alloc_iommu(struct zpci_dev *zdev, int size) |
| 223 | { |
| 224 | unsigned long offset, flags; |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 225 | int wrap = 0; |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 226 | |
| 227 | spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags); |
| 228 | offset = __dma_alloc_iommu(zdev, zdev->next_bit, size); |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 229 | if (offset == -1) { |
| 230 | /* wrap-around */ |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 231 | offset = __dma_alloc_iommu(zdev, 0, size); |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 232 | wrap = 1; |
| 233 | } |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 234 | |
| 235 | if (offset != -1) { |
| 236 | zdev->next_bit = offset + size; |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 237 | if (!zdev->tlb_refresh && !s390_iommu_strict && wrap) |
| 238 | /* global flush after wrap-around with lazy unmap */ |
| 239 | zpci_refresh_global(zdev); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 240 | } |
| 241 | spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags); |
| 242 | return offset; |
| 243 | } |
| 244 | |
| 245 | static void dma_free_iommu(struct zpci_dev *zdev, unsigned long offset, int size) |
| 246 | { |
| 247 | unsigned long flags; |
| 248 | |
| 249 | spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags); |
| 250 | if (!zdev->iommu_bitmap) |
| 251 | goto out; |
| 252 | bitmap_clear(zdev->iommu_bitmap, offset, size); |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 253 | /* |
| 254 | * Lazy flush for unmap: need to move next_bit to avoid address re-use |
| 255 | * until wrap-around. |
| 256 | */ |
| 257 | if (!s390_iommu_strict && offset >= zdev->next_bit) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 258 | zdev->next_bit = offset + size; |
| 259 | out: |
| 260 | spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags); |
| 261 | } |
| 262 | |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 263 | static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page, |
| 264 | unsigned long offset, size_t size, |
| 265 | enum dma_data_direction direction, |
| 266 | struct dma_attrs *attrs) |
| 267 | { |
Sebastian Ott | 198a527 | 2015-06-23 14:06:35 +0200 | [diff] [blame] | 268 | struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 269 | unsigned long nr_pages, iommu_page_index; |
| 270 | unsigned long pa = page_to_phys(page) + offset; |
| 271 | int flags = ZPCI_PTE_VALID; |
| 272 | dma_addr_t dma_addr; |
| 273 | |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 274 | /* This rounds up number of pages based on size and offset */ |
| 275 | nr_pages = iommu_num_pages(pa, size, PAGE_SIZE); |
| 276 | iommu_page_index = dma_alloc_iommu(zdev, nr_pages); |
| 277 | if (iommu_page_index == -1) |
| 278 | goto out_err; |
| 279 | |
| 280 | /* Use rounded up size */ |
| 281 | size = nr_pages * PAGE_SIZE; |
| 282 | |
| 283 | dma_addr = zdev->start_dma + iommu_page_index * PAGE_SIZE; |
Sebastian Ott | 1f1dcbd | 2013-10-22 15:17:19 +0200 | [diff] [blame] | 284 | if (dma_addr + size > zdev->end_dma) |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 285 | goto out_free; |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 286 | |
| 287 | if (direction == DMA_NONE || direction == DMA_TO_DEVICE) |
| 288 | flags |= ZPCI_TABLE_PROTECTED; |
| 289 | |
Jan Glauber | d0b0885 | 2012-12-11 14:53:35 +0100 | [diff] [blame] | 290 | if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) { |
Sebastian Ott | 6001018 | 2015-04-10 14:33:08 +0200 | [diff] [blame] | 291 | atomic64_add(nr_pages, &zdev->mapped_pages); |
Gerald Schaefer | 186f50f | 2013-04-22 19:27:17 +0200 | [diff] [blame] | 292 | return dma_addr + (offset & ~PAGE_MASK); |
Jan Glauber | d0b0885 | 2012-12-11 14:53:35 +0100 | [diff] [blame] | 293 | } |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 294 | |
| 295 | out_free: |
| 296 | dma_free_iommu(zdev, iommu_page_index, nr_pages); |
| 297 | out_err: |
Sebastian Ott | 1f1dcbd | 2013-10-22 15:17:19 +0200 | [diff] [blame] | 298 | zpci_err("map error:\n"); |
| 299 | zpci_err_hex(&pa, sizeof(pa)); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 300 | return DMA_ERROR_CODE; |
| 301 | } |
| 302 | |
| 303 | static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr, |
| 304 | size_t size, enum dma_data_direction direction, |
| 305 | struct dma_attrs *attrs) |
| 306 | { |
Sebastian Ott | 198a527 | 2015-06-23 14:06:35 +0200 | [diff] [blame] | 307 | struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 308 | unsigned long iommu_page_index; |
| 309 | int npages; |
| 310 | |
| 311 | npages = iommu_num_pages(dma_addr, size, PAGE_SIZE); |
| 312 | dma_addr = dma_addr & PAGE_MASK; |
| 313 | if (dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE, |
Sebastian Ott | 1f1dcbd | 2013-10-22 15:17:19 +0200 | [diff] [blame] | 314 | ZPCI_TABLE_PROTECTED | ZPCI_PTE_INVALID)) { |
| 315 | zpci_err("unmap error:\n"); |
| 316 | zpci_err_hex(&dma_addr, sizeof(dma_addr)); |
| 317 | } |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 318 | |
Sebastian Ott | 6001018 | 2015-04-10 14:33:08 +0200 | [diff] [blame] | 319 | atomic64_add(npages, &zdev->unmapped_pages); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 320 | iommu_page_index = (dma_addr - zdev->start_dma) >> PAGE_SHIFT; |
| 321 | dma_free_iommu(zdev, iommu_page_index, npages); |
| 322 | } |
| 323 | |
| 324 | static void *s390_dma_alloc(struct device *dev, size_t size, |
| 325 | dma_addr_t *dma_handle, gfp_t flag, |
| 326 | struct dma_attrs *attrs) |
| 327 | { |
Sebastian Ott | 198a527 | 2015-06-23 14:06:35 +0200 | [diff] [blame] | 328 | struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 329 | struct page *page; |
| 330 | unsigned long pa; |
| 331 | dma_addr_t map; |
| 332 | |
| 333 | size = PAGE_ALIGN(size); |
| 334 | page = alloc_pages(flag, get_order(size)); |
| 335 | if (!page) |
| 336 | return NULL; |
Jan Glauber | d0b0885 | 2012-12-11 14:53:35 +0100 | [diff] [blame] | 337 | |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 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 | |
Sebastian Ott | 6001018 | 2015-04-10 14:33:08 +0200 | [diff] [blame] | 348 | atomic64_add(size / PAGE_SIZE, &zdev->allocated_pages); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 349 | if (dma_handle) |
| 350 | *dma_handle = map; |
| 351 | return (void *) pa; |
| 352 | } |
| 353 | |
| 354 | static void s390_dma_free(struct device *dev, size_t size, |
| 355 | void *pa, dma_addr_t dma_handle, |
| 356 | struct dma_attrs *attrs) |
| 357 | { |
Sebastian Ott | 198a527 | 2015-06-23 14:06:35 +0200 | [diff] [blame] | 358 | struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); |
Sebastian Ott | f7038b7 | 2013-12-12 17:53:59 +0100 | [diff] [blame] | 359 | |
| 360 | size = PAGE_ALIGN(size); |
Sebastian Ott | 6001018 | 2015-04-10 14:33:08 +0200 | [diff] [blame] | 361 | atomic64_sub(size / PAGE_SIZE, &zdev->allocated_pages); |
Sebastian Ott | f7038b7 | 2013-12-12 17:53:59 +0100 | [diff] [blame] | 362 | s390_dma_unmap_pages(dev, dma_handle, size, DMA_BIDIRECTIONAL, NULL); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 363 | free_pages((unsigned long) pa, get_order(size)); |
| 364 | } |
| 365 | |
| 366 | static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg, |
| 367 | int nr_elements, enum dma_data_direction dir, |
| 368 | struct dma_attrs *attrs) |
| 369 | { |
| 370 | int mapped_elements = 0; |
| 371 | struct scatterlist *s; |
| 372 | int i; |
| 373 | |
| 374 | for_each_sg(sg, s, nr_elements, i) { |
| 375 | struct page *page = sg_page(s); |
| 376 | s->dma_address = s390_dma_map_pages(dev, page, s->offset, |
| 377 | s->length, dir, NULL); |
| 378 | if (!dma_mapping_error(dev, s->dma_address)) { |
| 379 | s->dma_length = s->length; |
| 380 | mapped_elements++; |
| 381 | } else |
| 382 | goto unmap; |
| 383 | } |
| 384 | out: |
| 385 | return mapped_elements; |
| 386 | |
| 387 | unmap: |
| 388 | for_each_sg(sg, s, mapped_elements, i) { |
| 389 | if (s->dma_address) |
| 390 | s390_dma_unmap_pages(dev, s->dma_address, s->dma_length, |
| 391 | dir, NULL); |
| 392 | s->dma_address = 0; |
| 393 | s->dma_length = 0; |
| 394 | } |
| 395 | mapped_elements = 0; |
| 396 | goto out; |
| 397 | } |
| 398 | |
| 399 | static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg, |
| 400 | int nr_elements, enum dma_data_direction dir, |
| 401 | struct dma_attrs *attrs) |
| 402 | { |
| 403 | struct scatterlist *s; |
| 404 | int i; |
| 405 | |
| 406 | for_each_sg(sg, s, nr_elements, i) { |
| 407 | s390_dma_unmap_pages(dev, s->dma_address, s->dma_length, dir, NULL); |
| 408 | s->dma_address = 0; |
| 409 | s->dma_length = 0; |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | int zpci_dma_init_device(struct zpci_dev *zdev) |
| 414 | { |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 415 | int rc; |
| 416 | |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 417 | /* |
| 418 | * At this point, if the device is part of an IOMMU domain, this would |
| 419 | * be a strong hint towards a bug in the IOMMU API (common) code and/or |
| 420 | * simultaneous access via IOMMU and DMA API. So let's issue a warning. |
| 421 | */ |
| 422 | WARN_ON(zdev->s390_domain); |
| 423 | |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 424 | spin_lock_init(&zdev->iommu_bitmap_lock); |
| 425 | spin_lock_init(&zdev->dma_table_lock); |
| 426 | |
| 427 | zdev->dma_table = dma_alloc_cpu_table(); |
| 428 | if (!zdev->dma_table) { |
| 429 | rc = -ENOMEM; |
| 430 | goto out_clean; |
| 431 | } |
| 432 | |
| 433 | zdev->iommu_size = (unsigned long) high_memory - PAGE_OFFSET; |
| 434 | zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT; |
Sebastian Ott | 2245932 | 2013-08-29 20:31:50 +0200 | [diff] [blame] | 435 | zdev->iommu_bitmap = vzalloc(zdev->iommu_pages / 8); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 436 | if (!zdev->iommu_bitmap) { |
| 437 | rc = -ENOMEM; |
| 438 | goto out_reg; |
| 439 | } |
| 440 | |
| 441 | rc = zpci_register_ioat(zdev, |
| 442 | 0, |
| 443 | zdev->start_dma + PAGE_OFFSET, |
| 444 | zdev->start_dma + zdev->iommu_size - 1, |
| 445 | (u64) zdev->dma_table); |
| 446 | if (rc) |
| 447 | goto out_reg; |
| 448 | return 0; |
| 449 | |
| 450 | out_reg: |
| 451 | dma_free_cpu_table(zdev->dma_table); |
| 452 | out_clean: |
| 453 | return rc; |
| 454 | } |
| 455 | |
| 456 | void zpci_dma_exit_device(struct zpci_dev *zdev) |
| 457 | { |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 458 | /* |
| 459 | * At this point, if the device is part of an IOMMU domain, this would |
| 460 | * be a strong hint towards a bug in the IOMMU API (common) code and/or |
| 461 | * simultaneous access via IOMMU and DMA API. So let's issue a warning. |
| 462 | */ |
| 463 | WARN_ON(zdev->s390_domain); |
| 464 | |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 465 | zpci_unregister_ioat(zdev, 0); |
Gerald Schaefer | 8128f23 | 2015-08-27 15:33:03 +0200 | [diff] [blame] | 466 | dma_cleanup_tables(zdev->dma_table); |
| 467 | zdev->dma_table = NULL; |
Sebastian Ott | 2245932 | 2013-08-29 20:31:50 +0200 | [diff] [blame] | 468 | vfree(zdev->iommu_bitmap); |
Jan Glauber | 828b35f | 2012-11-29 14:33:30 +0100 | [diff] [blame] | 469 | zdev->iommu_bitmap = NULL; |
| 470 | zdev->next_bit = 0; |
| 471 | } |
| 472 | |
| 473 | static int __init dma_alloc_cpu_table_caches(void) |
| 474 | { |
| 475 | dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables", |
| 476 | ZPCI_TABLE_SIZE, ZPCI_TABLE_ALIGN, |
| 477 | 0, NULL); |
| 478 | if (!dma_region_table_cache) |
| 479 | return -ENOMEM; |
| 480 | |
| 481 | dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables", |
| 482 | ZPCI_PT_SIZE, ZPCI_PT_ALIGN, |
| 483 | 0, NULL); |
| 484 | if (!dma_page_table_cache) { |
| 485 | kmem_cache_destroy(dma_region_table_cache); |
| 486 | return -ENOMEM; |
| 487 | } |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | int __init zpci_dma_init(void) |
| 492 | { |
| 493 | return dma_alloc_cpu_table_caches(); |
| 494 | } |
| 495 | |
| 496 | void zpci_dma_exit(void) |
| 497 | { |
| 498 | kmem_cache_destroy(dma_page_table_cache); |
| 499 | kmem_cache_destroy(dma_region_table_cache); |
| 500 | } |
| 501 | |
| 502 | #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) |
| 503 | |
| 504 | static int __init dma_debug_do_init(void) |
| 505 | { |
| 506 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); |
| 507 | return 0; |
| 508 | } |
| 509 | fs_initcall(dma_debug_do_init); |
| 510 | |
| 511 | struct dma_map_ops s390_dma_ops = { |
| 512 | .alloc = s390_dma_alloc, |
| 513 | .free = s390_dma_free, |
| 514 | .map_sg = s390_dma_map_sg, |
| 515 | .unmap_sg = s390_dma_unmap_sg, |
| 516 | .map_page = s390_dma_map_pages, |
| 517 | .unmap_page = s390_dma_unmap_pages, |
| 518 | /* if we support direct DMA this must be conditional */ |
| 519 | .is_phys = 0, |
| 520 | /* dma_supported is unconditionally true without a callback */ |
| 521 | }; |
| 522 | EXPORT_SYMBOL_GPL(s390_dma_ops); |
Gerald Schaefer | c60d1ae | 2014-07-18 17:37:08 +0200 | [diff] [blame] | 523 | |
| 524 | static int __init s390_iommu_setup(char *str) |
| 525 | { |
| 526 | if (!strncmp(str, "strict", 6)) |
| 527 | s390_iommu_strict = 1; |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | __setup("s390_iommu=", s390_iommu_setup); |