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 | |
22 | static void __iomem *cxlflash_psa_map(void *ctx_cookie) |
23 | { |
24 | return cxl_psa_map(ctx: ctx_cookie); |
25 | } |
26 | |
27 | static void cxlflash_psa_unmap(void __iomem *addr) |
28 | { |
29 | cxl_psa_unmap(addr); |
30 | } |
31 | |
32 | static int cxlflash_process_element(void *ctx_cookie) |
33 | { |
34 | return cxl_process_element(ctx: ctx_cookie); |
35 | } |
36 | |
37 | static 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(cxl: ctx_cookie, num, handler, cookie, name); |
41 | } |
42 | |
43 | static void cxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie) |
44 | { |
45 | cxl_unmap_afu_irq(cxl: ctx_cookie, num, cookie); |
46 | } |
47 | |
48 | static u64 cxlflash_get_irq_objhndl(void *ctx_cookie, int irq) |
49 | { |
50 | /* Dummy fop for cxl */ |
51 | return 0; |
52 | } |
53 | |
54 | static int cxlflash_start_context(void *ctx_cookie) |
55 | { |
56 | return cxl_start_context(ctx: ctx_cookie, wed: 0, NULL); |
57 | } |
58 | |
59 | static int cxlflash_stop_context(void *ctx_cookie) |
60 | { |
61 | return cxl_stop_context(ctx: ctx_cookie); |
62 | } |
63 | |
64 | static int cxlflash_afu_reset(void *ctx_cookie) |
65 | { |
66 | return cxl_afu_reset(ctx: ctx_cookie); |
67 | } |
68 | |
69 | static void cxlflash_set_master(void *ctx_cookie) |
70 | { |
71 | cxl_set_master(ctx: ctx_cookie); |
72 | } |
73 | |
74 | static void *cxlflash_get_context(struct pci_dev *dev, void *afu_cookie) |
75 | { |
76 | return cxl_get_context(dev); |
77 | } |
78 | |
79 | static void *cxlflash_dev_context_init(struct pci_dev *dev, void *afu_cookie) |
80 | { |
81 | return cxl_dev_context_init(dev); |
82 | } |
83 | |
84 | static int cxlflash_release_context(void *ctx_cookie) |
85 | { |
86 | return cxl_release_context(ctx: ctx_cookie); |
87 | } |
88 | |
89 | static void cxlflash_perst_reloads_same_image(void *afu_cookie, bool image) |
90 | { |
91 | cxl_perst_reloads_same_image(afu: afu_cookie, perst_reloads_same_image: image); |
92 | } |
93 | |
94 | static 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 | |
100 | static int cxlflash_allocate_afu_irqs(void *ctx_cookie, int num) |
101 | { |
102 | return cxl_allocate_afu_irqs(cxl: ctx_cookie, num); |
103 | } |
104 | |
105 | static void cxlflash_free_afu_irqs(void *ctx_cookie) |
106 | { |
107 | cxl_free_afu_irqs(cxl: ctx_cookie); |
108 | } |
109 | |
110 | static void *cxlflash_create_afu(struct pci_dev *dev) |
111 | { |
112 | return cxl_pci_to_afu(dev); |
113 | } |
114 | |
115 | static void cxlflash_destroy_afu(void *afu) |
116 | { |
117 | /* Dummy fop for cxl */ |
118 | } |
119 | |
120 | static struct file *cxlflash_get_fd(void *ctx_cookie, |
121 | struct file_operations *fops, int *fd) |
122 | { |
123 | return cxl_get_fd(ctx: ctx_cookie, fops, fd); |
124 | } |
125 | |
126 | static void *cxlflash_fops_get_context(struct file *file) |
127 | { |
128 | return cxl_fops_get_context(file); |
129 | } |
130 | |
131 | static 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: ctx_cookie, work: &work); |
139 | } |
140 | |
141 | static int cxlflash_fd_mmap(struct file *file, struct vm_area_struct *vm) |
142 | { |
143 | return cxl_fd_mmap(file, vm); |
144 | } |
145 | |
146 | static int cxlflash_fd_release(struct inode *inode, struct file *file) |
147 | { |
148 | return cxl_fd_release(inode, file); |
149 | } |
150 | |
151 | const 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 | |