drivers/misc/cxl/phb.c

   1 /*
   2  * Copyright 2014-2016 IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/pci.h>
  11 #include "cxl.h"
  12
  13 bool _cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu)
  14 {
  15         struct cxl_context *ctx;
  16
  17         /*
  18          * Allocate a context to do cxl things to. This is used for interrupts
  19          * in the peer model using a real phb, and if we eventually do DMA ops
  20          * in the virtual phb, we'll need a default context to attach them to.
  21          */
  22         ctx = cxl_dev_context_init(dev);
  23         if (IS_ERR(ctx))
  24                 return false;
  25         dev->dev.archdata.cxl_ctx = ctx;
  26
  27         return (cxl_ops->afu_check_and_enable(afu) == 0);
  28 }
  29 /* exported via cxl_base */
  30
  31 void _cxl_pci_disable_device(struct pci_dev *dev)
  32 {
  33         struct cxl_context *ctx = cxl_get_context(dev);
  34
  35         if (ctx) {
  36                 if (ctx->status == STARTED) {
  37                         dev_err(&dev->dev, "Default context started\n");
  38                         return;
  39                 }
  40                 dev->dev.archdata.cxl_ctx = NULL;
  41                 cxl_release_context(ctx);
  42         }
  43 }
  44 /* exported via cxl_base */