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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * CXL Flash Device Driver4 *5 * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation6 * Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation7 *8 * Copyright (C) 2018 IBM Corporation9 */10 11#include <misc/cxl.h>12 13#include "backend.h"14 15/*16 * The following routines map the cxlflash backend operations to existing CXL17 * kernel API function and are largely simple shims that provide an abstraction18 * for converting generic context and AFU cookies into cxl_context or cxl_afu19 * 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