xref: /openbmc/linux/drivers/scsi/cxlflash/cxl_hw.c (revision 2874c5fd)
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 
cxlflash_psa_map(void * ctx_cookie)22 static void __iomem *cxlflash_psa_map(void *ctx_cookie)
23 {
24 	return cxl_psa_map(ctx_cookie);
25 }
26 
cxlflash_psa_unmap(void __iomem * addr)27 static void cxlflash_psa_unmap(void __iomem *addr)
28 {
29 	cxl_psa_unmap(addr);
30 }
31 
cxlflash_process_element(void * ctx_cookie)32 static int cxlflash_process_element(void *ctx_cookie)
33 {
34 	return cxl_process_element(ctx_cookie);
35 }
36 
cxlflash_map_afu_irq(void * ctx_cookie,int num,irq_handler_t handler,void * cookie,char * name)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(ctx_cookie, num, handler, cookie, name);
41 }
42 
cxlflash_unmap_afu_irq(void * ctx_cookie,int num,void * cookie)43 static void cxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie)
44 {
45 	cxl_unmap_afu_irq(ctx_cookie, num, cookie);
46 }
47 
cxlflash_get_irq_objhndl(void * ctx_cookie,int irq)48 static u64 cxlflash_get_irq_objhndl(void *ctx_cookie, int irq)
49 {
50 	/* Dummy fop for cxl */
51 	return 0;
52 }
53 
cxlflash_start_context(void * ctx_cookie)54 static int cxlflash_start_context(void *ctx_cookie)
55 {
56 	return cxl_start_context(ctx_cookie, 0, NULL);
57 }
58 
cxlflash_stop_context(void * ctx_cookie)59 static int cxlflash_stop_context(void *ctx_cookie)
60 {
61 	return cxl_stop_context(ctx_cookie);
62 }
63 
cxlflash_afu_reset(void * ctx_cookie)64 static int cxlflash_afu_reset(void *ctx_cookie)
65 {
66 	return cxl_afu_reset(ctx_cookie);
67 }
68 
cxlflash_set_master(void * ctx_cookie)69 static void cxlflash_set_master(void *ctx_cookie)
70 {
71 	cxl_set_master(ctx_cookie);
72 }
73 
cxlflash_get_context(struct pci_dev * dev,void * afu_cookie)74 static void *cxlflash_get_context(struct pci_dev *dev, void *afu_cookie)
75 {
76 	return cxl_get_context(dev);
77 }
78 
cxlflash_dev_context_init(struct pci_dev * dev,void * afu_cookie)79 static void *cxlflash_dev_context_init(struct pci_dev *dev, void *afu_cookie)
80 {
81 	return cxl_dev_context_init(dev);
82 }
83 
cxlflash_release_context(void * ctx_cookie)84 static int cxlflash_release_context(void *ctx_cookie)
85 {
86 	return cxl_release_context(ctx_cookie);
87 }
88 
cxlflash_perst_reloads_same_image(void * afu_cookie,bool image)89 static void cxlflash_perst_reloads_same_image(void *afu_cookie, bool image)
90 {
91 	cxl_perst_reloads_same_image(afu_cookie, image);
92 }
93 
cxlflash_read_adapter_vpd(struct pci_dev * dev,void * buf,size_t count)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 
cxlflash_allocate_afu_irqs(void * ctx_cookie,int num)100 static int cxlflash_allocate_afu_irqs(void *ctx_cookie, int num)
101 {
102 	return cxl_allocate_afu_irqs(ctx_cookie, num);
103 }
104 
cxlflash_free_afu_irqs(void * ctx_cookie)105 static void cxlflash_free_afu_irqs(void *ctx_cookie)
106 {
107 	cxl_free_afu_irqs(ctx_cookie);
108 }
109 
cxlflash_create_afu(struct pci_dev * dev)110 static void *cxlflash_create_afu(struct pci_dev *dev)
111 {
112 	return cxl_pci_to_afu(dev);
113 }
114 
cxlflash_destroy_afu(void * afu)115 static void cxlflash_destroy_afu(void *afu)
116 {
117 	/* Dummy fop for cxl */
118 }
119 
cxlflash_get_fd(void * ctx_cookie,struct file_operations * fops,int * fd)120 static 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 
cxlflash_fops_get_context(struct file * file)126 static void *cxlflash_fops_get_context(struct file *file)
127 {
128 	return cxl_fops_get_context(file);
129 }
130 
cxlflash_start_work(void * ctx_cookie,u64 irqs)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_cookie, &work);
139 }
140 
cxlflash_fd_mmap(struct file * file,struct vm_area_struct * vm)141 static int cxlflash_fd_mmap(struct file *file, struct vm_area_struct *vm)
142 {
143 	return cxl_fd_mmap(file, vm);
144 }
145 
cxlflash_fd_release(struct inode * inode,struct file * file)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