drivers/dma/ioat/dma_v2.h

   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_V2_H
  22 #define IOATDMA_V2_H
  23
  24 #include <linux/dmaengine.h>
  25 #include "dma.h"
  26 #include "hw.h"
  27
  28
  29 extern int ioat_pending_level;
  30 extern int ioat_ring_alloc_order;
  31
  32 /*
  33  * workaround for IOAT ver.3.0 null descriptor issue
  34  * (channel returns error when size is 0)
  35  */
  36 #define NULL_DESC_BUFFER_SIZE 1
  37
  38 #define IOAT_MAX_ORDER 16
  39 #define ioat_get_alloc_order() \
  40         (min(ioat_ring_alloc_order, IOAT_MAX_ORDER))
  41 #define ioat_get_max_alloc_order() \
  42         (min(ioat_ring_max_alloc_order, IOAT_MAX_ORDER))
  43
  44 /* struct ioat2_dma_chan - ioat v2 / v3 channel attributes
  45  * @base: common ioat channel parameters
  46  * @xfercap_log; log2 of channel max transfer length (for fast division)
  47  * @head: allocated index
  48  * @issued: hardware notification point
  49  * @tail: cleanup index
  50  * @pending: lock free indicator for issued != head
  51  * @dmacount: identical to 'head' except for occasionally resetting to zero
  52  * @alloc_order: log2 of the number of allocated descriptors
  53  * @ring: software ring buffer implementation of hardware ring
  54  * @ring_lock: protects ring attributes
  55  */
  56 struct ioat2_dma_chan {
  57         struct ioat_chan_common base;
  58         size_t xfercap_log;
  59         u16 head;
  60         u16 issued;
  61         u16 tail;
  62         u16 dmacount;
  63         u16 alloc_order;
  64         int pending;
  65         struct ioat_ring_ent **ring;
  66         spinlock_t ring_lock;
  67 };
  68
  69 static inline struct ioat2_dma_chan *to_ioat2_chan(struct dma_chan *c)
  70 {
  71         struct ioat_chan_common *chan = to_chan_common(c);
  72
  73         return container_of(chan, struct ioat2_dma_chan, base);
  74 }
  75
  76 static inline u16 ioat2_ring_mask(struct ioat2_dma_chan *ioat)
  77 {
  78         return (1 << ioat->alloc_order) - 1;
  79 }
  80
  81 /* count of descriptors in flight with the engine */
  82 static inline u16 ioat2_ring_active(struct ioat2_dma_chan *ioat)
  83 {
  84         return (ioat->head - ioat->tail) & ioat2_ring_mask(ioat);
  85 }
  86
  87 /* count of descriptors pending submission to hardware */
  88 static inline u16 ioat2_ring_pending(struct ioat2_dma_chan *ioat)
  89 {
  90         return (ioat->head - ioat->issued) & ioat2_ring_mask(ioat);
  91 }
  92
  93 static inline u16 ioat2_ring_space(struct ioat2_dma_chan *ioat)
  94 {
  95         u16 num_descs = ioat2_ring_mask(ioat) + 1;
  96         u16 active = ioat2_ring_active(ioat);
  97
  98         BUG_ON(active > num_descs);
  99
 100         return num_descs - active;
 101 }
 102
 103 /* assumes caller already checked space */
 104 static inline u16 ioat2_desc_alloc(struct ioat2_dma_chan *ioat, u16 len)
 105 {
 106         ioat->head += len;
 107         return ioat->head - len;
 108 }
 109
 110 static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len)
 111 {
 112         u16 num_descs = len >> ioat->xfercap_log;
 113
 114         num_descs += !!(len & ((1 << ioat->xfercap_log) - 1));
 115         return num_descs;
 116 }
 117
 118 /**
 119  * struct ioat_ring_ent - wrapper around hardware descriptor
 120  * @hw: hardware DMA descriptor (for memcpy)
 121  * @fill: hardware fill descriptor
 122  * @xor: hardware xor descriptor
 123  * @xor_ex: hardware xor extension descriptor
 124  * @pq: hardware pq descriptor
 125  * @pq_ex: hardware pq extension descriptor
 126  * @pqu: hardware pq update descriptor
 127  * @raw: hardware raw (un-typed) descriptor
 128  * @txd: the generic software descriptor for all engines
 129  * @len: total transaction length for unmap
 130  * @result: asynchronous result of validate operations
 131  * @id: identifier for debug
 132  */
 133
 134 struct ioat_ring_ent {
 135         union {
 136                 struct ioat_dma_descriptor *hw;
 137                 struct ioat_fill_descriptor *fill;
 138                 struct ioat_xor_descriptor *xor;
 139                 struct ioat_xor_ext_descriptor *xor_ex;
 140                 struct ioat_pq_descriptor *pq;
 141                 struct ioat_pq_ext_descriptor *pq_ex;
 142                 struct ioat_pq_update_descriptor *pqu;
 143                 struct ioat_raw_descriptor *raw;
 144         };
 145         struct dma_async_tx_descriptor txd;
 146         size_t len;
 147         enum sum_check_flags *result;
 148         #ifdef DEBUG
 149         int id;
 150         #endif
 151 };
 152
 153 static inline struct ioat_ring_ent *
 154 ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx)
 155 {
 156         return ioat->ring[idx & ioat2_ring_mask(ioat)];
 157 }
 158
 159 static inline void ioat2_set_chainaddr(struct ioat2_dma_chan *ioat, u64 addr)
 160 {
 161         struct ioat_chan_common *chan = &ioat->base;
 162
 163         writel(addr & 0x00000000FFFFFFFF,
 164                chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
 165         writel(addr >> 32,
 166                chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
 167 }
 168
 169 int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca);
 170 int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca);
 171 struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 172 struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 173 int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs);
 174 int ioat2_enumerate_channels(struct ioatdma_device *device);
 175 struct dma_async_tx_descriptor *
 176 ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
 177                            dma_addr_t dma_src, size_t len, unsigned long flags);
 178 void ioat2_issue_pending(struct dma_chan *chan);
 179 int ioat2_alloc_chan_resources(struct dma_chan *c);
 180 void ioat2_free_chan_resources(struct dma_chan *c);
 181 enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie,
 182                                   dma_cookie_t *done, dma_cookie_t *used);
 183 void __ioat2_restart_chan(struct ioat2_dma_chan *ioat);
 184 bool reshape_ring(struct ioat2_dma_chan *ioat, int order);
 185 void __ioat2_issue_pending(struct ioat2_dma_chan *ioat);
 186 extern struct kobj_type ioat2_ktype;
 187 #endif /* IOATDMA_V2_H */