1 /* 2 * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the Free 6 * Software Foundation; either version 2 of the License, or (at your option) 7 * any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program; if not, write to the Free Software Foundation, Inc., 59 16 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17 * 18 * The full GNU General Public License is included in this distribution in the 19 * file called COPYING. 20 */ 21 #ifndef IOATDMA_H 22 #define IOATDMA_H 23 24 #include <linux/dmaengine.h> 25 #include "hw.h" 26 #include "registers.h" 27 #include <linux/init.h> 28 #include <linux/dmapool.h> 29 #include <linux/cache.h> 30 #include <linux/pci_ids.h> 31 #include <net/tcp.h> 32 33 #define IOAT_DMA_VERSION "4.00" 34 35 #define IOAT_LOW_COMPLETION_MASK 0xffffffc0 36 #define IOAT_DMA_DCA_ANY_CPU ~0 37 38 #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) 39 #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) 40 #define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, txd) 41 #define to_dev(ioat_chan) (&(ioat_chan)->device->pdev->dev) 42 43 #define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) 44 45 /* 46 * workaround for IOAT ver.3.0 null descriptor issue 47 * (channel returns error when size is 0) 48 */ 49 #define NULL_DESC_BUFFER_SIZE 1 50 51 /** 52 * struct ioatdma_device - internal representation of a IOAT device 53 * @pdev: PCI-Express device 54 * @reg_base: MMIO register space base address 55 * @dma_pool: for allocating DMA descriptors 56 * @common: embedded struct dma_device 57 * @version: version of ioatdma device 58 * @msix_entries: irq handlers 59 * @idx: per channel data 60 * @dca: direct cache access context 61 * @intr_quirk: interrupt setup quirk (for ioat_v1 devices) 62 * @enumerate_channels: hw version specific channel enumeration 63 * @reset_hw: hw version specific channel (re)initialization 64 * @cleanup_fn: select between the v2 and v3 cleanup routines 65 * @timer_fn: select between the v2 and v3 timer watchdog routines 66 * @self_test: hardware version specific self test for each supported op type 67 * 68 * Note: the v3 cleanup routine supports raid operations 69 */ 70 struct ioatdma_device { 71 struct pci_dev *pdev; 72 void __iomem *reg_base; 73 struct pci_pool *dma_pool; 74 struct pci_pool *completion_pool; 75 struct dma_device common; 76 u8 version; 77 struct msix_entry msix_entries[4]; 78 struct ioat_chan_common *idx[4]; 79 struct dca_provider *dca; 80 void (*intr_quirk)(struct ioatdma_device *device); 81 int (*enumerate_channels)(struct ioatdma_device *device); 82 int (*reset_hw)(struct ioat_chan_common *chan); 83 void (*cleanup_fn)(unsigned long data); 84 void (*timer_fn)(unsigned long data); 85 int (*self_test)(struct ioatdma_device *device); 86 }; 87 88 struct ioat_chan_common { 89 struct dma_chan common; 90 void __iomem *reg_base; 91 dma_addr_t last_completion; 92 spinlock_t cleanup_lock; 93 unsigned long state; 94 #define IOAT_COMPLETION_PENDING 0 95 #define IOAT_COMPLETION_ACK 1 96 #define IOAT_RESET_PENDING 2 97 #define IOAT_KOBJ_INIT_FAIL 3 98 #define IOAT_RESHAPE_PENDING 4 99 #define IOAT_RUN 5 100 #define IOAT_CHAN_ACTIVE 6 101 struct timer_list timer; 102 #define COMPLETION_TIMEOUT msecs_to_jiffies(100) 103 #define IDLE_TIMEOUT msecs_to_jiffies(2000) 104 #define RESET_DELAY msecs_to_jiffies(100) 105 struct ioatdma_device *device; 106 dma_addr_t completion_dma; 107 u64 *completion; 108 struct tasklet_struct cleanup_task; 109 struct kobject kobj; 110 }; 111 112 struct ioat_sysfs_entry { 113 struct attribute attr; 114 ssize_t (*show)(struct dma_chan *, char *); 115 }; 116 117 /** 118 * struct ioat_dma_chan - internal representation of a DMA channel 119 */ 120 struct ioat_dma_chan { 121 struct ioat_chan_common base; 122 123 size_t xfercap; /* XFERCAP register value expanded out */ 124 125 spinlock_t desc_lock; 126 struct list_head free_desc; 127 struct list_head used_desc; 128 129 int pending; 130 u16 desccount; 131 u16 active; 132 }; 133 134 static inline struct ioat_chan_common *to_chan_common(struct dma_chan *c) 135 { 136 return container_of(c, struct ioat_chan_common, common); 137 } 138 139 static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c) 140 { 141 struct ioat_chan_common *chan = to_chan_common(c); 142 143 return container_of(chan, struct ioat_dma_chan, base); 144 } 145 146 /* wrapper around hardware descriptor format + additional software fields */ 147 148 /** 149 * struct ioat_desc_sw - wrapper around hardware descriptor 150 * @hw: hardware DMA descriptor (for memcpy) 151 * @node: this descriptor will either be on the free list, 152 * or attached to a transaction list (tx_list) 153 * @txd: the generic software descriptor for all engines 154 * @id: identifier for debug 155 */ 156 struct ioat_desc_sw { 157 struct ioat_dma_descriptor *hw; 158 struct list_head node; 159 size_t len; 160 struct list_head tx_list; 161 struct dma_async_tx_descriptor txd; 162 #ifdef DEBUG 163 int id; 164 #endif 165 }; 166 167 #ifdef DEBUG 168 #define set_desc_id(desc, i) ((desc)->id = (i)) 169 #define desc_id(desc) ((desc)->id) 170 #else 171 #define set_desc_id(desc, i) 172 #define desc_id(desc) (0) 173 #endif 174 175 static inline void 176 __dump_desc_dbg(struct ioat_chan_common *chan, struct ioat_dma_descriptor *hw, 177 struct dma_async_tx_descriptor *tx, int id) 178 { 179 struct device *dev = to_dev(chan); 180 181 dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x" 182 " ctl: %#x (op: %d int_en: %d compl: %d)\n", id, 183 (unsigned long long) tx->phys, 184 (unsigned long long) hw->next, tx->cookie, tx->flags, 185 hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write); 186 } 187 188 #define dump_desc_dbg(c, d) \ 189 ({ if (d) __dump_desc_dbg(&c->base, d->hw, &d->txd, desc_id(d)); 0; }) 190 191 static inline void ioat_set_tcp_copy_break(unsigned long copybreak) 192 { 193 #ifdef CONFIG_NET_DMA 194 sysctl_tcp_dma_copybreak = copybreak; 195 #endif 196 } 197 198 static inline struct ioat_chan_common * 199 ioat_chan_by_index(struct ioatdma_device *device, int index) 200 { 201 return device->idx[index]; 202 } 203 204 static inline u64 ioat_chansts(struct ioat_chan_common *chan) 205 { 206 u8 ver = chan->device->version; 207 u64 status; 208 u32 status_lo; 209 210 /* We need to read the low address first as this causes the 211 * chipset to latch the upper bits for the subsequent read 212 */ 213 status_lo = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_LOW(ver)); 214 status = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_HIGH(ver)); 215 status <<= 32; 216 status |= status_lo; 217 218 return status; 219 } 220 221 static inline void ioat_start(struct ioat_chan_common *chan) 222 { 223 u8 ver = chan->device->version; 224 225 writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); 226 } 227 228 static inline u64 ioat_chansts_to_addr(u64 status) 229 { 230 return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; 231 } 232 233 static inline u32 ioat_chanerr(struct ioat_chan_common *chan) 234 { 235 return readl(chan->reg_base + IOAT_CHANERR_OFFSET); 236 } 237 238 static inline void ioat_suspend(struct ioat_chan_common *chan) 239 { 240 u8 ver = chan->device->version; 241 242 writeb(IOAT_CHANCMD_SUSPEND, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); 243 } 244 245 static inline void ioat_reset(struct ioat_chan_common *chan) 246 { 247 u8 ver = chan->device->version; 248 249 writeb(IOAT_CHANCMD_RESET, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); 250 } 251 252 static inline bool ioat_reset_pending(struct ioat_chan_common *chan) 253 { 254 u8 ver = chan->device->version; 255 u8 cmd; 256 257 cmd = readb(chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); 258 return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET; 259 } 260 261 static inline void ioat_set_chainaddr(struct ioat_dma_chan *ioat, u64 addr) 262 { 263 struct ioat_chan_common *chan = &ioat->base; 264 265 writel(addr & 0x00000000FFFFFFFF, 266 chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); 267 writel(addr >> 32, 268 chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); 269 } 270 271 static inline bool is_ioat_active(unsigned long status) 272 { 273 return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE); 274 } 275 276 static inline bool is_ioat_idle(unsigned long status) 277 { 278 return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE); 279 } 280 281 static inline bool is_ioat_halted(unsigned long status) 282 { 283 return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED); 284 } 285 286 static inline bool is_ioat_suspended(unsigned long status) 287 { 288 return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED); 289 } 290 291 /* channel was fatally programmed */ 292 static inline bool is_ioat_bug(unsigned long err) 293 { 294 return !!err; 295 } 296 297 static inline void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, 298 int direction, enum dma_ctrl_flags flags, bool dst) 299 { 300 if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) || 301 (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE))) 302 pci_unmap_single(pdev, addr, len, direction); 303 else 304 pci_unmap_page(pdev, addr, len, direction); 305 } 306 307 int ioat_probe(struct ioatdma_device *device); 308 int ioat_register(struct ioatdma_device *device); 309 int ioat1_dma_probe(struct ioatdma_device *dev, int dca); 310 int ioat_dma_self_test(struct ioatdma_device *device); 311 void ioat_dma_remove(struct ioatdma_device *device); 312 struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); 313 dma_addr_t ioat_get_current_completion(struct ioat_chan_common *chan); 314 void ioat_init_channel(struct ioatdma_device *device, 315 struct ioat_chan_common *chan, int idx); 316 enum dma_status ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie, 317 struct dma_tx_state *txstate); 318 void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, 319 size_t len, struct ioat_dma_descriptor *hw); 320 bool ioat_cleanup_preamble(struct ioat_chan_common *chan, 321 dma_addr_t *phys_complete); 322 void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type); 323 void ioat_kobject_del(struct ioatdma_device *device); 324 extern const struct sysfs_ops ioat_sysfs_ops; 325 extern struct ioat_sysfs_entry ioat_version_attr; 326 extern struct ioat_sysfs_entry ioat_cap_attr; 327 #endif /* IOATDMA_H */ 328