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5cbafa65 DW |
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; | |
bf40a686 | 30 | extern int ioat_ring_alloc_order; |
5cbafa65 DW |
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)) | |
a309218a DW |
41 | #define ioat_get_max_alloc_order() \ |
42 | (min(ioat_ring_max_alloc_order, IOAT_MAX_ORDER)) | |
5cbafa65 DW |
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 | ||
2aec048c DW |
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 | * @id: identifier for debug | |
131 | */ | |
132 | ||
5cbafa65 | 133 | struct ioat_ring_ent { |
2aec048c DW |
134 | union { |
135 | struct ioat_dma_descriptor *hw; | |
136 | struct ioat_fill_descriptor *fill; | |
137 | struct ioat_xor_descriptor *xor; | |
138 | struct ioat_xor_ext_descriptor *xor_ex; | |
139 | struct ioat_pq_descriptor *pq; | |
140 | struct ioat_pq_ext_descriptor *pq_ex; | |
141 | struct ioat_pq_update_descriptor *pqu; | |
142 | struct ioat_raw_descriptor *raw; | |
143 | }; | |
5cbafa65 DW |
144 | struct dma_async_tx_descriptor txd; |
145 | size_t len; | |
6df9183a DW |
146 | #ifdef DEBUG |
147 | int id; | |
148 | #endif | |
5cbafa65 DW |
149 | }; |
150 | ||
151 | static inline struct ioat_ring_ent * | |
152 | ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) | |
153 | { | |
154 | return ioat->ring[idx & ioat2_ring_mask(ioat)]; | |
155 | } | |
156 | ||
09c8a5b8 DW |
157 | static inline void ioat2_set_chainaddr(struct ioat2_dma_chan *ioat, u64 addr) |
158 | { | |
159 | struct ioat_chan_common *chan = &ioat->base; | |
160 | ||
161 | writel(addr & 0x00000000FFFFFFFF, | |
162 | chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); | |
163 | writel(addr >> 32, | |
164 | chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); | |
165 | } | |
166 | ||
345d8523 DW |
167 | int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca); |
168 | int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca); | |
169 | struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); | |
170 | struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); | |
bf40a686 DW |
171 | int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs); |
172 | int ioat2_enumerate_channels(struct ioatdma_device *device); | |
173 | struct dma_async_tx_descriptor * | |
174 | ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, | |
175 | dma_addr_t dma_src, size_t len, unsigned long flags); | |
176 | void ioat2_issue_pending(struct dma_chan *chan); | |
177 | int ioat2_alloc_chan_resources(struct dma_chan *c); | |
178 | void ioat2_free_chan_resources(struct dma_chan *c); | |
179 | enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, | |
180 | dma_cookie_t *done, dma_cookie_t *used); | |
181 | void __ioat2_restart_chan(struct ioat2_dma_chan *ioat); | |
182 | bool reshape_ring(struct ioat2_dma_chan *ioat, int order); | |
5669e31c | 183 | extern struct kobj_type ioat2_ktype; |
5cbafa65 | 184 | #endif /* IOATDMA_V2_H */ |