drivers/dma/ioatdma.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_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 #include <net/tcp.h>
  31
  32 #define IOAT_DMA_VERSION  "3.64"
  33
  34 enum ioat_interrupt {
  35         none = 0,
  36         msix_multi_vector = 1,
  37         msix_single_vector = 2,
  38         msi = 3,
  39         intx = 4,
  40 };
  41
  42 #define IOAT_LOW_COMPLETION_MASK        0xffffffc0
  43 #define IOAT_DMA_DCA_ANY_CPU            ~0
  44 #define IOAT_WATCHDOG_PERIOD            (2 * HZ)
  45
  46
  47 /**
  48  * struct ioatdma_device - internal representation of a IOAT device
  49  * @pdev: PCI-Express device
  50  * @reg_base: MMIO register space base address
  51  * @dma_pool: for allocating DMA descriptors
  52  * @common: embedded struct dma_device
  53  * @version: version of ioatdma device
  54  * @irq_mode: which style irq to use
  55  * @msix_entries: irq handlers
  56  * @idx: per channel data
  57  */
  58
  59 struct ioatdma_device {
  60         struct pci_dev *pdev;
  61         void __iomem *reg_base;
  62         struct pci_pool *dma_pool;
  63         struct pci_pool *completion_pool;
  64         struct dma_device common;
  65         u8 version;
  66         enum ioat_interrupt irq_mode;
  67         struct delayed_work work;
  68         struct msix_entry msix_entries[4];
  69         struct ioat_dma_chan *idx[4];
  70 };
  71
  72 /**
  73  * struct ioat_dma_chan - internal representation of a DMA channel
  74  */
  75 struct ioat_dma_chan {
  76
  77         void __iomem *reg_base;
  78
  79         dma_cookie_t completed_cookie;
  80         unsigned long last_completion;
  81         unsigned long last_completion_time;
  82
  83         size_t xfercap; /* XFERCAP register value expanded out */
  84
  85         spinlock_t cleanup_lock;
  86         spinlock_t desc_lock;
  87         struct list_head free_desc;
  88         struct list_head used_desc;
  89         unsigned long watchdog_completion;
  90         int watchdog_tcp_cookie;
  91         u32 watchdog_last_tcp_cookie;
  92         struct delayed_work work;
  93
  94         int pending;
  95         int dmacount;
  96         int desccount;
  97
  98         struct ioatdma_device *device;
  99         struct dma_chan common;
 100
 101         dma_addr_t completion_addr;
 102         union {
 103                 u64 full; /* HW completion writeback */
 104                 struct {
 105                         u32 low;
 106                         u32 high;
 107                 };
 108         } *completion_virt;
 109         unsigned long last_compl_desc_addr_hw;
 110         struct tasklet_struct cleanup_task;
 111 };
 112
 113 /* wrapper around hardware descriptor format + additional software fields */
 114
 115 /**
 116  * struct ioat_desc_sw - wrapper around hardware descriptor
 117  * @hw: hardware DMA descriptor
 118  * @node: this descriptor will either be on the free list,
 119  *     or attached to a transaction list (async_tx.tx_list)
 120  * @tx_cnt: number of descriptors required to complete the transaction
 121  * @async_tx: the generic software descriptor for all engines
 122  */
 123 struct ioat_desc_sw {
 124         struct ioat_dma_descriptor *hw;
 125         struct list_head node;
 126         int tx_cnt;
 127         size_t len;
 128         dma_addr_t src;
 129         dma_addr_t dst;
 130         struct dma_async_tx_descriptor async_tx;
 131 };
 132
 133 static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev)
 134 {
 135         #ifdef CONFIG_NET_DMA
 136         switch (dev->version) {
 137         case IOAT_VER_1_2:
 138                 sysctl_tcp_dma_copybreak = 4096;
 139                 break;
 140         case IOAT_VER_2_0:
 141                 sysctl_tcp_dma_copybreak = 2048;
 142                 break;
 143         case IOAT_VER_3_0:
 144                 sysctl_tcp_dma_copybreak = 262144;
 145                 break;
 146         }
 147         #endif
 148 }
 149
 150 #if defined(CONFIG_INTEL_IOATDMA) || defined(CONFIG_INTEL_IOATDMA_MODULE)
 151 struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
 152                                       void __iomem *iobase);
 153 void ioat_dma_remove(struct ioatdma_device *device);
 154 struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 155 struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 156 struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 157 #else
 158 #define ioat_dma_probe(pdev, iobase)    NULL
 159 #define ioat_dma_remove(device)         do { } while (0)
 160 #define ioat_dca_init(pdev, iobase)     NULL
 161 #define ioat2_dca_init(pdev, iobase)    NULL
 162 #define ioat3_dca_init(pdev, iobase)    NULL
 163 #endif
 164
 165 #endif /* IOATDMA_H */