drivers/dma/ioatdma.h

   1 /*
   2  * Copyright(c) 2004 - 2006 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 "ioatdma_hw.h"
  26 #include <linux/init.h>
  27 #include <linux/dmapool.h>
  28 #include <linux/cache.h>
  29 #include <linux/pci_ids.h>
  30
  31 #define IOAT_LOW_COMPLETION_MASK        0xffffffc0
  32
  33 extern struct list_head dma_device_list;
  34 extern struct list_head dma_client_list;
  35
  36 /**
  37  * struct ioat_device - internal representation of a IOAT device
  38  * @pdev: PCI-Express device
  39  * @reg_base: MMIO register space base address
  40  * @dma_pool: for allocating DMA descriptors
  41  * @common: embedded struct dma_device
  42  * @msi: Message Signaled Interrupt number
  43  */
  44
  45 struct ioat_device {
  46         struct pci_dev *pdev;
  47         void __iomem *reg_base;
  48         struct pci_pool *dma_pool;
  49         struct pci_pool *completion_pool;
  50
  51         struct dma_device common;
  52         u8 msi;
  53 };
  54
  55 /**
  56  * struct ioat_dma_chan - internal representation of a DMA channel
  57  * @device:
  58  * @reg_base:
  59  * @sw_in_use:
  60  * @completion:
  61  * @completion_low:
  62  * @completion_high:
  63  * @completed_cookie: last cookie seen completed on cleanup
  64  * @cookie: value of last cookie given to client
  65  * @last_completion:
  66  * @xfercap:
  67  * @desc_lock:
  68  * @free_desc:
  69  * @used_desc:
  70  * @resource:
  71  * @device_node:
  72  */
  73
  74 struct ioat_dma_chan {
  75
  76         void __iomem *reg_base;
  77
  78         dma_cookie_t completed_cookie;
  79         unsigned long last_completion;
  80
  81         u32 xfercap;    /* XFERCAP register value expanded out */
  82
  83         spinlock_t cleanup_lock;
  84         spinlock_t desc_lock;
  85         struct list_head free_desc;
  86         struct list_head used_desc;
  87
  88         int pending;
  89
  90         struct ioat_device *device;
  91         struct dma_chan common;
  92
  93         dma_addr_t completion_addr;
  94         union {
  95                 u64 full; /* HW completion writeback */
  96                 struct {
  97                         u32 low;
  98                         u32 high;
  99                 };
 100         } *completion_virt;
 101 };
 102
 103 /* wrapper around hardware descriptor format + additional software fields */
 104
 105 /**
 106  * struct ioat_desc_sw - wrapper around hardware descriptor
 107  * @hw: hardware DMA descriptor
 108  * @node:
 109  * @cookie:
 110  * @phys:
 111  */
 112
 113 struct ioat_desc_sw {
 114         struct ioat_dma_descriptor *hw;
 115         struct list_head node;
 116         dma_cookie_t cookie;
 117         dma_addr_t phys;
 118         DECLARE_PCI_UNMAP_ADDR(src)
 119         DECLARE_PCI_UNMAP_LEN(src_len)
 120         DECLARE_PCI_UNMAP_ADDR(dst)
 121         DECLARE_PCI_UNMAP_LEN(dst_len)
 122 };
 123
 124 #endif /* IOATDMA_H */
 125