drivers/scsi/cxlflash/cxl_hw.c

   1 /*
   2  * CXL Flash Device Driver
   3  *
   4  * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
   5  *             Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
   6  *
   7  * Copyright (C) 2018 IBM Corporation
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <misc/cxl.h>
  16
  17 #include "backend.h"
  18
  19 /*
  20  * The following routines map the cxlflash backend operations to existing CXL
  21  * kernel API function and are largely simple shims that provide an abstraction
  22  * for converting generic context and AFU cookies into cxl_context or cxl_afu
  23  * pointers.
  24  */
  25
  26 static void __iomem *cxlflash_psa_map(void *ctx_cookie)
  27 {
  28         return cxl_psa_map(ctx_cookie);
  29 }
  30
  31 static void cxlflash_psa_unmap(void __iomem *addr)
  32 {
  33         cxl_psa_unmap(addr);
  34 }
  35
  36 static int cxlflash_process_element(void *ctx_cookie)
  37 {
  38         return cxl_process_element(ctx_cookie);
  39 }
  40
  41 static int cxlflash_map_afu_irq(void *ctx_cookie, int num,
  42                                 irq_handler_t handler, void *cookie, char *name)
  43 {
  44         return cxl_map_afu_irq(ctx_cookie, num, handler, cookie, name);
  45 }
  46
  47 static void cxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie)
  48 {
  49         cxl_unmap_afu_irq(ctx_cookie, num, cookie);
  50 }
  51
  52 static u64 cxlflash_get_irq_objhndl(void *ctx_cookie, int irq)
  53 {
  54         /* Dummy fop for cxl */
  55         return 0;
  56 }
  57
  58 static int cxlflash_start_context(void *ctx_cookie)
  59 {
  60         return cxl_start_context(ctx_cookie, 0, NULL);
  61 }
  62
  63 static int cxlflash_stop_context(void *ctx_cookie)
  64 {
  65         return cxl_stop_context(ctx_cookie);
  66 }
  67
  68 static int cxlflash_afu_reset(void *ctx_cookie)
  69 {
  70         return cxl_afu_reset(ctx_cookie);
  71 }
  72
  73 static void cxlflash_set_master(void *ctx_cookie)
  74 {
  75         cxl_set_master(ctx_cookie);
  76 }
  77
  78 static void *cxlflash_get_context(struct pci_dev *dev, void *afu_cookie)
  79 {
  80         return cxl_get_context(dev);
  81 }
  82
  83 static void *cxlflash_dev_context_init(struct pci_dev *dev, void *afu_cookie)
  84 {
  85         return cxl_dev_context_init(dev);
  86 }
  87
  88 static int cxlflash_release_context(void *ctx_cookie)
  89 {
  90         return cxl_release_context(ctx_cookie);
  91 }
  92
  93 static void cxlflash_perst_reloads_same_image(void *afu_cookie, bool image)
  94 {
  95         cxl_perst_reloads_same_image(afu_cookie, image);
  96 }
  97
  98 static ssize_t cxlflash_read_adapter_vpd(struct pci_dev *dev,
  99                                          void *buf, size_t count)
 100 {
 101         return cxl_read_adapter_vpd(dev, buf, count);
 102 }
 103
 104 static int cxlflash_allocate_afu_irqs(void *ctx_cookie, int num)
 105 {
 106         return cxl_allocate_afu_irqs(ctx_cookie, num);
 107 }
 108
 109 static void cxlflash_free_afu_irqs(void *ctx_cookie)
 110 {
 111         cxl_free_afu_irqs(ctx_cookie);
 112 }
 113
 114 static void *cxlflash_create_afu(struct pci_dev *dev)
 115 {
 116         return cxl_pci_to_afu(dev);
 117 }
 118
 119 static void cxlflash_destroy_afu(void *afu)
 120 {
 121         /* Dummy fop for cxl */
 122 }
 123
 124 static struct file *cxlflash_get_fd(void *ctx_cookie,
 125                                     struct file_operations *fops, int *fd)
 126 {
 127         return cxl_get_fd(ctx_cookie, fops, fd);
 128 }
 129
 130 static void *cxlflash_fops_get_context(struct file *file)
 131 {
 132         return cxl_fops_get_context(file);
 133 }
 134
 135 static int cxlflash_start_work(void *ctx_cookie, u64 irqs)
 136 {
 137         struct cxl_ioctl_start_work work = { 0 };
 138
 139         work.num_interrupts = irqs;
 140         work.flags = CXL_START_WORK_NUM_IRQS;
 141
 142         return cxl_start_work(ctx_cookie, &work);
 143 }
 144
 145 static int cxlflash_fd_mmap(struct file *file, struct vm_area_struct *vm)
 146 {
 147         return cxl_fd_mmap(file, vm);
 148 }
 149
 150 static int cxlflash_fd_release(struct inode *inode, struct file *file)
 151 {
 152         return cxl_fd_release(inode, file);
 153 }
 154
 155 const struct cxlflash_backend_ops cxlflash_cxl_ops = {
 156         .module                 = THIS_MODULE,
 157         .psa_map                = cxlflash_psa_map,
 158         .psa_unmap              = cxlflash_psa_unmap,
 159         .process_element        = cxlflash_process_element,
 160         .map_afu_irq            = cxlflash_map_afu_irq,
 161         .unmap_afu_irq          = cxlflash_unmap_afu_irq,
 162         .get_irq_objhndl        = cxlflash_get_irq_objhndl,
 163         .start_context          = cxlflash_start_context,
 164         .stop_context           = cxlflash_stop_context,
 165         .afu_reset              = cxlflash_afu_reset,
 166         .set_master             = cxlflash_set_master,
 167         .get_context            = cxlflash_get_context,
 168         .dev_context_init       = cxlflash_dev_context_init,
 169         .release_context        = cxlflash_release_context,
 170         .perst_reloads_same_image = cxlflash_perst_reloads_same_image,
 171         .read_adapter_vpd       = cxlflash_read_adapter_vpd,
 172         .allocate_afu_irqs      = cxlflash_allocate_afu_irqs,
 173         .free_afu_irqs          = cxlflash_free_afu_irqs,
 174         .create_afu             = cxlflash_create_afu,
 175         .destroy_afu            = cxlflash_destroy_afu,
 176         .get_fd                 = cxlflash_get_fd,
 177         .fops_get_context       = cxlflash_fops_get_context,
 178         .start_work             = cxlflash_start_work,
 179         .fd_mmap                = cxlflash_fd_mmap,
 180         .fd_release             = cxlflash_fd_release,
 181 };