drivers/infiniband/hw/ehca/ehca_uverbs.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  userspace support verbs
   5  *
   6  *  Authors: Christoph Raisch <raisch@de.ibm.com>
   7  *           Hoang-Nam Nguyen <hnguyen@de.ibm.com>
   8  *           Heiko J Schick <schickhj@de.ibm.com>
   9  *
  10  *  Copyright (c) 2005 IBM Corporation
  11  *
  12  *  All rights reserved.
  13  *
  14  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  15  *  BSD.
  16  *
  17  * OpenIB BSD License
  18  *
  19  * Redistribution and use in source and binary forms, with or without
  20  * modification, are permitted provided that the following conditions are met:
  21  *
  22  * Redistributions of source code must retain the above copyright notice, this
  23  * list of conditions and the following disclaimer.
  24  *
  25  * Redistributions in binary form must reproduce the above copyright notice,
  26  * this list of conditions and the following disclaimer in the documentation
  27  * and/or other materials
  28  * provided with the distribution.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  31  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  34  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  35  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  36  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  37  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  38  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  40  * POSSIBILITY OF SUCH DAMAGE.
  41  */
  42
  43 #include <linux/slab.h>
  44
  45 #include "ehca_classes.h"
  46 #include "ehca_iverbs.h"
  47 #include "ehca_mrmw.h"
  48 #include "ehca_tools.h"
  49 #include "hcp_if.h"
  50
  51 struct ib_ucontext *ehca_alloc_ucontext(struct ib_device *device,
  52                                         struct ib_udata *udata)
  53 {
  54         struct ehca_ucontext *my_context;
  55
  56         my_context = kzalloc(sizeof *my_context, GFP_KERNEL);
  57         if (!my_context) {
  58                 ehca_err(device, "Out of memory device=%p", device);
  59                 return ERR_PTR(-ENOMEM);
  60         }
  61
  62         return &my_context->ib_ucontext;
  63 }
  64
  65 int ehca_dealloc_ucontext(struct ib_ucontext *context)
  66 {
  67         kfree(container_of(context, struct ehca_ucontext, ib_ucontext));
  68         return 0;
  69 }
  70
  71 static void ehca_mm_open(struct vm_area_struct *vma)
  72 {
  73         u32 *count = (u32 *)vma->vm_private_data;
  74         if (!count) {
  75                 ehca_gen_err("Invalid vma struct vm_start=%lx vm_end=%lx",
  76                              vma->vm_start, vma->vm_end);
  77                 return;
  78         }
  79         (*count)++;
  80         if (!(*count))
  81                 ehca_gen_err("Use count overflow vm_start=%lx vm_end=%lx",
  82                              vma->vm_start, vma->vm_end);
  83         ehca_gen_dbg("vm_start=%lx vm_end=%lx count=%x",
  84                      vma->vm_start, vma->vm_end, *count);
  85 }
  86
  87 static void ehca_mm_close(struct vm_area_struct *vma)
  88 {
  89         u32 *count = (u32 *)vma->vm_private_data;
  90         if (!count) {
  91                 ehca_gen_err("Invalid vma struct vm_start=%lx vm_end=%lx",
  92                              vma->vm_start, vma->vm_end);
  93                 return;
  94         }
  95         (*count)--;
  96         ehca_gen_dbg("vm_start=%lx vm_end=%lx count=%x",
  97                      vma->vm_start, vma->vm_end, *count);
  98 }
  99
 100 static const struct vm_operations_struct vm_ops = {
 101         .open = ehca_mm_open,
 102         .close = ehca_mm_close,
 103 };
 104
 105 static int ehca_mmap_fw(struct vm_area_struct *vma, struct h_galpas *galpas,
 106                         u32 *mm_count)
 107 {
 108         int ret;
 109         u64 vsize, physical;
 110
 111         vsize = vma->vm_end - vma->vm_start;
 112         if (vsize < EHCA_PAGESIZE) {
 113                 ehca_gen_err("invalid vsize=%lx", vma->vm_end - vma->vm_start);
 114                 return -EINVAL;
 115         }
 116
 117         physical = galpas->user.fw_handle;
 118         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 119         ehca_gen_dbg("vsize=%llx physical=%llx", vsize, physical);
 120         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
 121         ret = remap_4k_pfn(vma, vma->vm_start, physical >> EHCA_PAGESHIFT,
 122                            vma->vm_page_prot);
 123         if (unlikely(ret)) {
 124                 ehca_gen_err("remap_pfn_range() failed ret=%i", ret);
 125                 return -ENOMEM;
 126         }
 127
 128         vma->vm_private_data = mm_count;
 129         (*mm_count)++;
 130         vma->vm_ops = &vm_ops;
 131
 132         return 0;
 133 }
 134
 135 static int ehca_mmap_queue(struct vm_area_struct *vma, struct ipz_queue *queue,
 136                            u32 *mm_count)
 137 {
 138         int ret;
 139         u64 start, ofs;
 140         struct page *page;
 141
 142         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 143         start = vma->vm_start;
 144         for (ofs = 0; ofs < queue->queue_length; ofs += PAGE_SIZE) {
 145                 u64 virt_addr = (u64)ipz_qeit_calc(queue, ofs);
 146                 page = virt_to_page(virt_addr);
 147                 ret = vm_insert_page(vma, start, page);
 148                 if (unlikely(ret)) {
 149                         ehca_gen_err("vm_insert_page() failed rc=%i", ret);
 150                         return ret;
 151                 }
 152                 start += PAGE_SIZE;
 153         }
 154         vma->vm_private_data = mm_count;
 155         (*mm_count)++;
 156         vma->vm_ops = &vm_ops;
 157
 158         return 0;
 159 }
 160
 161 static int ehca_mmap_cq(struct vm_area_struct *vma, struct ehca_cq *cq,
 162                         u32 rsrc_type)
 163 {
 164         int ret;
 165
 166         switch (rsrc_type) {
 167         case 0: /* galpa fw handle */
 168                 ehca_dbg(cq->ib_cq.device, "cq_num=%x fw", cq->cq_number);
 169                 ret = ehca_mmap_fw(vma, &cq->galpas, &cq->mm_count_galpa);
 170                 if (unlikely(ret)) {
 171                         ehca_err(cq->ib_cq.device,
 172                                  "ehca_mmap_fw() failed rc=%i cq_num=%x",
 173                                  ret, cq->cq_number);
 174                         return ret;
 175                 }
 176                 break;
 177
 178         case 1: /* cq queue_addr */
 179                 ehca_dbg(cq->ib_cq.device, "cq_num=%x queue", cq->cq_number);
 180                 ret = ehca_mmap_queue(vma, &cq->ipz_queue, &cq->mm_count_queue);
 181                 if (unlikely(ret)) {
 182                         ehca_err(cq->ib_cq.device,
 183                                  "ehca_mmap_queue() failed rc=%i cq_num=%x",
 184                                  ret, cq->cq_number);
 185                         return ret;
 186                 }
 187                 break;
 188
 189         default:
 190                 ehca_err(cq->ib_cq.device, "bad resource type=%x cq_num=%x",
 191                          rsrc_type, cq->cq_number);
 192                 return -EINVAL;
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int ehca_mmap_qp(struct vm_area_struct *vma, struct ehca_qp *qp,
 199                         u32 rsrc_type)
 200 {
 201         int ret;
 202
 203         switch (rsrc_type) {
 204         case 0: /* galpa fw handle */
 205                 ehca_dbg(qp->ib_qp.device, "qp_num=%x fw", qp->ib_qp.qp_num);
 206                 ret = ehca_mmap_fw(vma, &qp->galpas, &qp->mm_count_galpa);
 207                 if (unlikely(ret)) {
 208                         ehca_err(qp->ib_qp.device,
 209                                  "remap_pfn_range() failed ret=%i qp_num=%x",
 210                                  ret, qp->ib_qp.qp_num);
 211                         return -ENOMEM;
 212                 }
 213                 break;
 214
 215         case 1: /* qp rqueue_addr */
 216                 ehca_dbg(qp->ib_qp.device, "qp_num=%x rq", qp->ib_qp.qp_num);
 217                 ret = ehca_mmap_queue(vma, &qp->ipz_rqueue,
 218                                       &qp->mm_count_rqueue);
 219                 if (unlikely(ret)) {
 220                         ehca_err(qp->ib_qp.device,
 221                                  "ehca_mmap_queue(rq) failed rc=%i qp_num=%x",
 222                                  ret, qp->ib_qp.qp_num);
 223                         return ret;
 224                 }
 225                 break;
 226
 227         case 2: /* qp squeue_addr */
 228                 ehca_dbg(qp->ib_qp.device, "qp_num=%x sq", qp->ib_qp.qp_num);
 229                 ret = ehca_mmap_queue(vma, &qp->ipz_squeue,
 230                                       &qp->mm_count_squeue);
 231                 if (unlikely(ret)) {
 232                         ehca_err(qp->ib_qp.device,
 233                                  "ehca_mmap_queue(sq) failed rc=%i qp_num=%x",
 234                                  ret, qp->ib_qp.qp_num);
 235                         return ret;
 236                 }
 237                 break;
 238
 239         default:
 240                 ehca_err(qp->ib_qp.device, "bad resource type=%x qp=num=%x",
 241                          rsrc_type, qp->ib_qp.qp_num);
 242                 return -EINVAL;
 243         }
 244
 245         return 0;
 246 }
 247
 248 int ehca_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
 249 {
 250         u64 fileoffset = vma->vm_pgoff;
 251         u32 idr_handle = fileoffset & 0x1FFFFFF;
 252         u32 q_type = (fileoffset >> 27) & 0x1;    /* CQ, QP,...        */
 253         u32 rsrc_type = (fileoffset >> 25) & 0x3; /* sq,rq,cmnd_window */
 254         u32 ret;
 255         struct ehca_cq *cq;
 256         struct ehca_qp *qp;
 257         struct ib_uobject *uobject;
 258
 259         switch (q_type) {
 260         case  0: /* CQ */
 261                 read_lock(&ehca_cq_idr_lock);
 262                 cq = idr_find(&ehca_cq_idr, idr_handle);
 263                 read_unlock(&ehca_cq_idr_lock);
 264
 265                 /* make sure this mmap really belongs to the authorized user */
 266                 if (!cq)
 267                         return -EINVAL;
 268
 269                 if (!cq->ib_cq.uobject || cq->ib_cq.uobject->context != context)
 270                         return -EINVAL;
 271
 272                 ret = ehca_mmap_cq(vma, cq, rsrc_type);
 273                 if (unlikely(ret)) {
 274                         ehca_err(cq->ib_cq.device,
 275                                  "ehca_mmap_cq() failed rc=%i cq_num=%x",
 276                                  ret, cq->cq_number);
 277                         return ret;
 278                 }
 279                 break;
 280
 281         case 1: /* QP */
 282                 read_lock(&ehca_qp_idr_lock);
 283                 qp = idr_find(&ehca_qp_idr, idr_handle);
 284                 read_unlock(&ehca_qp_idr_lock);
 285
 286                 /* make sure this mmap really belongs to the authorized user */
 287                 if (!qp)
 288                         return -EINVAL;
 289
 290                 uobject = IS_SRQ(qp) ? qp->ib_srq.uobject : qp->ib_qp.uobject;
 291                 if (!uobject || uobject->context != context)
 292                         return -EINVAL;
 293
 294                 ret = ehca_mmap_qp(vma, qp, rsrc_type);
 295                 if (unlikely(ret)) {
 296                         ehca_err(qp->ib_qp.device,
 297                                  "ehca_mmap_qp() failed rc=%i qp_num=%x",
 298                                  ret, qp->ib_qp.qp_num);
 299                         return ret;
 300                 }
 301                 break;
 302
 303         default:
 304                 ehca_gen_err("bad queue type %x", q_type);
 305                 return -EINVAL;
 306         }
 307
 308         return 0;
 309 }