LXR linux/drivers/scsi/cxlflash/cxl

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * CXL Flash Device Driver
   4 *
   5 * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
   6 *             Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
   7 *
   8 * Copyright (C) 2018 IBM Corporation
   9 */
  10
  11#include <misc/cxl.h>
  12
  13#include "backend.h"
  14
  15/*
  16 * The following routines map the cxlflash backend operations to existing CXL
  17 * kernel API function and are largely simple shims that provide an abstraction
  18 * for converting generic context and AFU cookies into cxl_context or cxl_afu
  19 * pointers.
  20 */
  21
  22static void __iomem *cxlflash_psa_map(void *ctx_cookie)
  23{
  24        return cxl_psa_map(ctx_cookie);
  25}
  26
  27static void cxlflash_psa_unmap(void __iomem *addr)
  28{
  29        cxl_psa_unmap(addr);
  30}
  31
  32static int cxlflash_process_element(void *ctx_cookie)
  33{
  34        return cxl_process_element(ctx_cookie);
  35}
  36
  37static int cxlflash_map_afu_irq(void *ctx_cookie, int num,
  38                                irq_handler_t handler, void *cookie, char *name)
  39{
  40        return cxl_map_afu_irq(ctx_cookie, num, handler, cookie, name);
  41}
  42
  43static void cxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie)
  44{
  45        cxl_unmap_afu_irq(ctx_cookie, num, cookie);
  46}
  47
  48static u64 cxlflash_get_irq_objhndl(void *ctx_cookie, int irq)
  49{
  50        /* Dummy fop for cxl */
  51        return 0;
  52}
  53
  54static int cxlflash_start_context(void *ctx_cookie)
  55{
  56        return cxl_start_context(ctx_cookie, 0, NULL);
  57}
  58
  59static int cxlflash_stop_context(void *ctx_cookie)
  60{
  61        return cxl_stop_context(ctx_cookie);
  62}
  63
  64static int cxlflash_afu_reset(void *ctx_cookie)
  65{
  66        return cxl_afu_reset(ctx_cookie);
  67}
  68
  69static void cxlflash_set_master(void *ctx_cookie)
  70{
  71        cxl_set_master(ctx_cookie);
  72}
  73
  74static void *cxlflash_get_context(struct pci_dev *dev, void *afu_cookie)
  75{
  76        return cxl_get_context(dev);
  77}
  78
  79static void *cxlflash_dev_context_init(struct pci_dev *dev, void *afu_cookie)
  80{
  81        return cxl_dev_context_init(dev);
  82}
  83
  84static int cxlflash_release_context(void *ctx_cookie)
  85{
  86        return cxl_release_context(ctx_cookie);
  87}
  88
  89static void cxlflash_perst_reloads_same_image(void *afu_cookie, bool image)
  90{
  91        cxl_perst_reloads_same_image(afu_cookie, image);
  92}
  93
  94static ssize_t cxlflash_read_adapter_vpd(struct pci_dev *dev,
  95                                         void *buf, size_t count)
  96{
  97        return cxl_read_adapter_vpd(dev, buf, count);
  98}
  99
 100static int cxlflash_allocate_afu_irqs(void *ctx_cookie, int num)
 101{
 102        return cxl_allocate_afu_irqs(ctx_cookie, num);
 103}
 104
 105static void cxlflash_free_afu_irqs(void *ctx_cookie)
 106{
 107        cxl_free_afu_irqs(ctx_cookie);
 108}
 109
 110static void *cxlflash_create_afu(struct pci_dev *dev)
 111{
 112        return cxl_pci_to_afu(dev);
 113}
 114
 115static void cxlflash_destroy_afu(void *afu)
 116{
 117        /* Dummy fop for cxl */
 118}
 119
 120static struct file *cxlflash_get_fd(void *ctx_cookie,
 121                                    struct file_operations *fops, int *fd)
 122{
 123        return cxl_get_fd(ctx_cookie, fops, fd);
 124}
 125
 126static void *cxlflash_fops_get_context(struct file *file)
 127{
 128        return cxl_fops_get_context(file);
 129}
 130
 131static int cxlflash_start_work(void *ctx_cookie, u64 irqs)
 132{
 133        struct cxl_ioctl_start_work work = { 0 };
 134
 135        work.num_interrupts = irqs;
 136        work.flags = CXL_START_WORK_NUM_IRQS;
 137
 138        return cxl_start_work(ctx_cookie, &work);
 139}
 140
 141static int cxlflash_fd_mmap(struct file *file, struct vm_area_struct *vm)
 142{
 143        return cxl_fd_mmap(file, vm);
 144}
 145
 146static int cxlflash_fd_release(struct inode *inode, struct file *file)
 147{
 148        return cxl_fd_release(inode, file);
 149}
 150
 151const struct cxlflash_backend_ops cxlflash_cxl_ops = {
 152        .module                 = THIS_MODULE,
 153        .psa_map                = cxlflash_psa_map,
 154        .psa_unmap              = cxlflash_psa_unmap,
 155        .process_element        = cxlflash_process_element,
 156        .map_afu_irq            = cxlflash_map_afu_irq,
 157        .unmap_afu_irq          = cxlflash_unmap_afu_irq,
 158        .get_irq_objhndl        = cxlflash_get_irq_objhndl,
 159        .start_context          = cxlflash_start_context,
 160        .stop_context           = cxlflash_stop_context,
 161        .afu_reset              = cxlflash_afu_reset,
 162        .set_master             = cxlflash_set_master,
 163        .get_context            = cxlflash_get_context,
 164        .dev_context_init       = cxlflash_dev_context_init,
 165        .release_context        = cxlflash_release_context,
 166        .perst_reloads_same_image = cxlflash_perst_reloads_same_image,
 167        .read_adapter_vpd       = cxlflash_read_adapter_vpd,
 168        .allocate_afu_irqs      = cxlflash_allocate_afu_irqs,
 169        .free_afu_irqs          = cxlflash_free_afu_irqs,
 170        .create_afu             = cxlflash_create_afu,
 171        .destroy_afu            = cxlflash_destroy_afu,
 172        .get_fd                 = cxlflash_get_fd,
 173        .fops_get_context       = cxlflash_fops_get_context,
 174        .start_work             = cxlflash_start_work,
 175        .fd_mmap                = cxlflash_fd_mmap,
 176        .fd_release             = cxlflash_fd_release,
 177};
 178