drivers/infiniband/hw/usnic/usnic_uiom.h

   1 /*
   2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  *
  17  */
  18
  19 #ifndef USNIC_UIOM_H_
  20 #define USNIC_UIOM_H_
  21
  22 #include <linux/list.h>
  23 #include <linux/scatterlist.h>
  24
  25 #include "usnic_uiom_interval_tree.h"
  26
  27 #define USNIC_UIOM_READ                 (1)
  28 #define USNIC_UIOM_WRITE                (2)
  29
  30 #define USNIC_UIOM_MAX_PD_CNT           (1000)
  31 #define USNIC_UIOM_MAX_MR_CNT           (1000000)
  32 #define USNIC_UIOM_MAX_MR_SIZE          (~0UL)
  33 #define USNIC_UIOM_PAGE_SIZE            (PAGE_SIZE)
  34
  35 struct usnic_uiom_dev {
  36         struct device                   *dev;
  37         struct list_head                link;
  38 };
  39
  40 struct usnic_uiom_pd {
  41         struct iommu_domain             *domain;
  42         spinlock_t                      lock;
  43         struct rb_root                  rb_root;
  44         struct list_head                devs;
  45         int                             dev_cnt;
  46 };
  47
  48 struct usnic_uiom_reg {
  49         struct usnic_uiom_pd            *pd;
  50         unsigned long                   va;
  51         size_t                          length;
  52         int                             offset;
  53         int                             page_size;
  54         int                             writable;
  55         struct list_head                chunk_list;
  56         struct work_struct              work;
  57         struct mm_struct                *mm;
  58         unsigned long                   diff;
  59 };
  60
  61 struct usnic_uiom_chunk {
  62         struct list_head                list;
  63         int                             nents;
  64         struct scatterlist              page_list[0];
  65 };
  66
  67 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
  68 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
  69 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
  70 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
  71                                         struct device *dev);
  72 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
  73 void usnic_uiom_free_dev_list(struct device **devs);
  74 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
  75                                                 unsigned long addr, size_t size,
  76                                                 int access, int dmasync);
  77 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing);
  78 int usnic_uiom_init(char *drv_name);
  79 void usnic_uiom_fini(void);
  80 #endif /* USNIC_UIOM_H_ */