2 * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
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)
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
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.
18 * The full GNU General Public License is included in this distribution in the
19 * file called COPYING.
24 #include <linux/dmaengine.h>
26 #include <linux/init.h>
27 #include <linux/dmapool.h>
28 #include <linux/cache.h>
29 #include <linux/pci_ids.h>
32 #define IOAT_DMA_VERSION "3.64"
34 #define IOAT_LOW_COMPLETION_MASK 0xffffffc0
35 #define IOAT_DMA_DCA_ANY_CPU ~0
36 #define IOAT_WATCHDOG_PERIOD (2 * HZ)
38 #define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common)
39 #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common)
40 #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node)
41 #define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, txd)
42 #define to_dev(ioat_chan) (&(ioat_chan)->device->pdev->dev)
44 #define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80)
46 #define RESET_DELAY msecs_to_jiffies(100)
47 #define WATCHDOG_DELAY round_jiffies(msecs_to_jiffies(2000))
50 * workaround for IOAT ver.3.0 null descriptor issue
51 * (channel returns error when size is 0)
53 #define NULL_DESC_BUFFER_SIZE 1
56 * struct ioatdma_device - internal representation of a IOAT device
57 * @pdev: PCI-Express device
58 * @reg_base: MMIO register space base address
59 * @dma_pool: for allocating DMA descriptors
60 * @common: embedded struct dma_device
61 * @version: version of ioatdma device
62 * @msix_entries: irq handlers
63 * @idx: per channel data
66 struct ioatdma_device {
68 void __iomem *reg_base;
69 struct pci_pool *dma_pool;
70 struct pci_pool *completion_pool;
71 struct dma_device common;
73 struct delayed_work work;
74 struct msix_entry msix_entries[4];
75 struct ioat_dma_chan *idx[4];
79 * struct ioat_dma_chan - internal representation of a DMA channel
81 struct ioat_dma_chan {
83 void __iomem *reg_base;
85 dma_cookie_t completed_cookie;
86 unsigned long last_completion;
87 unsigned long last_completion_time;
89 size_t xfercap; /* XFERCAP register value expanded out */
91 spinlock_t cleanup_lock;
93 struct list_head free_desc;
94 struct list_head used_desc;
95 unsigned long watchdog_completion;
96 int watchdog_tcp_cookie;
97 u32 watchdog_last_tcp_cookie;
98 struct delayed_work work;
104 struct ioatdma_device *device;
105 struct dma_chan common;
107 dma_addr_t completion_addr;
109 u64 full; /* HW completion writeback */
115 unsigned long last_compl_desc_addr_hw;
116 struct tasklet_struct cleanup_task;
119 /* wrapper around hardware descriptor format + additional software fields */
122 * struct ioat_desc_sw - wrapper around hardware descriptor
123 * @hw: hardware DMA descriptor
124 * @node: this descriptor will either be on the free list,
125 * or attached to a transaction list (async_tx.tx_list)
126 * @tx_cnt: number of descriptors required to complete the transaction
127 * @txd: the generic software descriptor for all engines
129 struct ioat_desc_sw {
130 struct ioat_dma_descriptor *hw;
131 struct list_head node;
136 struct dma_async_tx_descriptor txd;
139 static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev)
141 #ifdef CONFIG_NET_DMA
142 switch (dev->version) {
144 sysctl_tcp_dma_copybreak = 4096;
147 sysctl_tcp_dma_copybreak = 2048;
150 sysctl_tcp_dma_copybreak = 262144;
156 struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
157 void __iomem *iobase);
158 void ioat_dma_remove(struct ioatdma_device *device);
159 struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase);
160 struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase);
161 struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase);
162 #endif /* IOATDMA_H */