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
  30 #define PCI_DEVICE_ID_INTEL_IOAT        0x1a38
  31
  32 #define IOAT_LOW_COMPLETION_MASK        0xffffffc0
  33
  34 extern struct list_head dma_device_list;
  35 extern struct list_head dma_client_list;
  36
  37 /**
  38  * struct ioat_device - internal representation of a IOAT device
  39  * @pdev: PCI-Express device
  40  * @reg_base: MMIO register space base address
  41  * @dma_pool: for allocating DMA descriptors
  42  * @common: embedded struct dma_device
  43  * @msi: Message Signaled Interrupt number
  44  */
  45
  46 struct ioat_device {
  47         struct pci_dev *pdev;
  48         void *reg_base;
  49         struct pci_pool *dma_pool;
  50         struct pci_pool *completion_pool;
  51
  52         struct dma_device common;
  53         u8 msi;
  54 };
  55
  56 /**
  57  * struct ioat_dma_chan - internal representation of a DMA channel
  58  * @device:
  59  * @reg_base:
  60  * @sw_in_use:
  61  * @completion:
  62  * @completion_low:
  63  * @completion_high:
  64  * @completed_cookie: last cookie seen completed on cleanup
  65  * @cookie: value of last cookie given to client
  66  * @last_completion:
  67  * @xfercap:
  68  * @desc_lock:
  69  * @free_desc:
  70  * @used_desc:
  71  * @resource:
  72  * @device_node:
  73  */
  74
  75 struct ioat_dma_chan {
  76
  77         void *reg_base;
  78
  79         dma_cookie_t completed_cookie;
  80         unsigned long last_completion;
  81
  82         u32 xfercap;    /* XFERCAP register value expanded out */
  83
  84         spinlock_t cleanup_lock;
  85         spinlock_t desc_lock;
  86         struct list_head free_desc;
  87         struct list_head used_desc;
  88
  89         int pending;
  90
  91         struct ioat_device *device;
  92         struct dma_chan common;
  93
  94         dma_addr_t completion_addr;
  95         union {
  96                 u64 full; /* HW completion writeback */
  97                 struct {
  98                         u32 low;
  99                         u32 high;
 100                 };
 101         } *completion_virt;
 102 };
 103
 104 /* wrapper around hardware descriptor format + additional software fields */
 105
 106 /**
 107  * struct ioat_desc_sw - wrapper around hardware descriptor
 108  * @hw: hardware DMA descriptor
 109  * @node:
 110  * @cookie:
 111  * @phys:
 112  */
 113
 114 struct ioat_desc_sw {
 115         struct ioat_dma_descriptor *hw;
 116         struct list_head node;
 117         dma_cookie_t cookie;
 118         dma_addr_t phys;
 119         DECLARE_PCI_UNMAP_ADDR(src)
 120         DECLARE_PCI_UNMAP_LEN(src_len)
 121         DECLARE_PCI_UNMAP_ADDR(dst)
 122         DECLARE_PCI_UNMAP_LEN(dst_len)
 123 };
 124
 125 #endif /* IOATDMA_H */
 126