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1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  * CXL Flash Device Driver
4  *
5  * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
6  *             Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
7  *
8  * Copyright (C) 2015 IBM Corporation
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License
12  * as published by the Free Software Foundation; either version
13  * 2 of the License, or (at your option) any later version.
14  */
15 
16 #ifndef _CXLFLASH_IOCTL_H
17 #define _CXLFLASH_IOCTL_H
18 
19 #include <linux/types.h>
20 
21 /*
22  * Structure and definitions for all CXL Flash ioctls
23  */
24 #define CXLFLASH_WWID_LEN		16
25 
26 /*
27  * Structure and flag definitions CXL Flash superpipe ioctls
28  */
29 
30 #define DK_CXLFLASH_VERSION_0	0
31 
32 struct dk_cxlflash_hdr {
33 	__u16 version;			/* Version data */
34 	__u16 rsvd[3];			/* Reserved for future use */
35 	__u64 flags;			/* Input flags */
36 	__u64 return_flags;		/* Returned flags */
37 };
38 
39 /*
40  * Return flag definitions available to all superpipe ioctls
41  *
42  * Similar to the input flags, these are grown from the bottom-up with the
43  * intention that ioctl-specific return flag definitions would grow from the
44  * top-down, allowing the two sets to co-exist. While not required/enforced
45  * at this time, this provides future flexibility.
46  */
47 #define DK_CXLFLASH_ALL_PORTS_ACTIVE	0x0000000000000001ULL
48 #define DK_CXLFLASH_APP_CLOSE_ADAP_FD	0x0000000000000002ULL
49 #define DK_CXLFLASH_CONTEXT_SQ_CMD_MODE	0x0000000000000004ULL
50 
51 /*
52  * General Notes:
53  * -------------
54  * The 'context_id' field of all ioctl structures contains the context
55  * identifier for a context in the lower 32-bits (upper 32-bits are not
56  * to be used when identifying a context to the AFU). That said, the value
57  * in its entirety (all 64-bits) is to be treated as an opaque cookie and
58  * should be presented as such when issuing ioctls.
59  */
60 
61 /*
62  * DK_CXLFLASH_ATTACH Notes:
63  * ------------------------
64  * Read/write access permissions are specified via the O_RDONLY, O_WRONLY,
65  * and O_RDWR flags defined in the fcntl.h header file.
66  *
67  * A valid adapter file descriptor (fd >= 0) is only returned on the initial
68  * attach (successful) of a context. When a context is shared(reused), the user
69  * is expected to already 'know' the adapter file descriptor associated with the
70  * context.
71  */
72 #define DK_CXLFLASH_ATTACH_REUSE_CONTEXT	0x8000000000000000ULL
73 
74 struct dk_cxlflash_attach {
75 	struct dk_cxlflash_hdr hdr;	/* Common fields */
76 	__u64 num_interrupts;		/* Requested number of interrupts */
77 	__u64 context_id;		/* Returned context */
78 	__u64 mmio_size;		/* Returned size of MMIO area */
79 	__u64 block_size;		/* Returned block size, in bytes */
80 	__u64 adap_fd;			/* Returned adapter file descriptor */
81 	__u64 last_lba;			/* Returned last LBA on the device */
82 	__u64 max_xfer;			/* Returned max transfer size, blocks */
83 	__u64 reserved[8];		/* Reserved for future use */
84 };
85 
86 struct dk_cxlflash_detach {
87 	struct dk_cxlflash_hdr hdr;	/* Common fields */
88 	__u64 context_id;		/* Context to detach */
89 	__u64 reserved[8];		/* Reserved for future use */
90 };
91 
92 struct dk_cxlflash_udirect {
93 	struct dk_cxlflash_hdr hdr;	/* Common fields */
94 	__u64 context_id;		/* Context to own physical resources */
95 	__u64 rsrc_handle;		/* Returned resource handle */
96 	__u64 last_lba;			/* Returned last LBA on the device */
97 	__u64 reserved[8];		/* Reserved for future use */
98 };
99 
100 #define DK_CXLFLASH_UVIRTUAL_NEED_WRITE_SAME	0x8000000000000000ULL
101 
102 struct dk_cxlflash_uvirtual {
103 	struct dk_cxlflash_hdr hdr;	/* Common fields */
104 	__u64 context_id;		/* Context to own virtual resources */
105 	__u64 lun_size;			/* Requested size, in 4K blocks */
106 	__u64 rsrc_handle;		/* Returned resource handle */
107 	__u64 last_lba;			/* Returned last LBA of LUN */
108 	__u64 reserved[8];		/* Reserved for future use */
109 };
110 
111 struct dk_cxlflash_release {
112 	struct dk_cxlflash_hdr hdr;	/* Common fields */
113 	__u64 context_id;		/* Context owning resources */
114 	__u64 rsrc_handle;		/* Resource handle to release */
115 	__u64 reserved[8];		/* Reserved for future use */
116 };
117 
118 struct dk_cxlflash_resize {
119 	struct dk_cxlflash_hdr hdr;	/* Common fields */
120 	__u64 context_id;		/* Context owning resources */
121 	__u64 rsrc_handle;		/* Resource handle of LUN to resize */
122 	__u64 req_size;			/* New requested size, in 4K blocks */
123 	__u64 last_lba;			/* Returned last LBA of LUN */
124 	__u64 reserved[8];		/* Reserved for future use */
125 };
126 
127 struct dk_cxlflash_clone {
128 	struct dk_cxlflash_hdr hdr;	/* Common fields */
129 	__u64 context_id_src;		/* Context to clone from */
130 	__u64 context_id_dst;		/* Context to clone to */
131 	__u64 adap_fd_src;		/* Source context adapter fd */
132 	__u64 reserved[8];		/* Reserved for future use */
133 };
134 
135 #define DK_CXLFLASH_VERIFY_SENSE_LEN	18
136 #define DK_CXLFLASH_VERIFY_HINT_SENSE	0x8000000000000000ULL
137 
138 struct dk_cxlflash_verify {
139 	struct dk_cxlflash_hdr hdr;	/* Common fields */
140 	__u64 context_id;		/* Context owning resources to verify */
141 	__u64 rsrc_handle;		/* Resource handle of LUN */
142 	__u64 hint;			/* Reasons for verify */
143 	__u64 last_lba;			/* Returned last LBA of device */
144 	__u8 sense_data[DK_CXLFLASH_VERIFY_SENSE_LEN]; /* SCSI sense data */
145 	__u8 pad[6];			/* Pad to next 8-byte boundary */
146 	__u64 reserved[8];		/* Reserved for future use */
147 };
148 
149 #define DK_CXLFLASH_RECOVER_AFU_CONTEXT_RESET	0x8000000000000000ULL
150 
151 struct dk_cxlflash_recover_afu {
152 	struct dk_cxlflash_hdr hdr;	/* Common fields */
153 	__u64 reason;			/* Reason for recovery request */
154 	__u64 context_id;		/* Context to recover / updated ID */
155 	__u64 mmio_size;		/* Returned size of MMIO area */
156 	__u64 adap_fd;			/* Returned adapter file descriptor */
157 	__u64 reserved[8];		/* Reserved for future use */
158 };
159 
160 #define DK_CXLFLASH_MANAGE_LUN_WWID_LEN			CXLFLASH_WWID_LEN
161 #define DK_CXLFLASH_MANAGE_LUN_ENABLE_SUPERPIPE		0x8000000000000000ULL
162 #define DK_CXLFLASH_MANAGE_LUN_DISABLE_SUPERPIPE	0x4000000000000000ULL
163 #define DK_CXLFLASH_MANAGE_LUN_ALL_PORTS_ACCESSIBLE	0x2000000000000000ULL
164 
165 struct dk_cxlflash_manage_lun {
166 	struct dk_cxlflash_hdr hdr;			/* Common fields */
167 	__u8 wwid[DK_CXLFLASH_MANAGE_LUN_WWID_LEN];	/* Page83 WWID, NAA-6 */
168 	__u64 reserved[8];				/* Rsvd, future use */
169 };
170 
171 union cxlflash_ioctls {
172 	struct dk_cxlflash_attach attach;
173 	struct dk_cxlflash_detach detach;
174 	struct dk_cxlflash_udirect udirect;
175 	struct dk_cxlflash_uvirtual uvirtual;
176 	struct dk_cxlflash_release release;
177 	struct dk_cxlflash_resize resize;
178 	struct dk_cxlflash_clone clone;
179 	struct dk_cxlflash_verify verify;
180 	struct dk_cxlflash_recover_afu recover_afu;
181 	struct dk_cxlflash_manage_lun manage_lun;
182 };
183 
184 #define MAX_CXLFLASH_IOCTL_SZ	(sizeof(union cxlflash_ioctls))
185 
186 #define CXL_MAGIC 0xCA
187 #define CXL_IOWR(_n, _s)	_IOWR(CXL_MAGIC, _n, struct _s)
188 
189 /*
190  * CXL Flash superpipe ioctls start at base of the reserved CXL_MAGIC
191  * region (0x80) and grow upwards.
192  */
193 #define DK_CXLFLASH_ATTACH		CXL_IOWR(0x80, dk_cxlflash_attach)
194 #define DK_CXLFLASH_USER_DIRECT		CXL_IOWR(0x81, dk_cxlflash_udirect)
195 #define DK_CXLFLASH_RELEASE		CXL_IOWR(0x82, dk_cxlflash_release)
196 #define DK_CXLFLASH_DETACH		CXL_IOWR(0x83, dk_cxlflash_detach)
197 #define DK_CXLFLASH_VERIFY		CXL_IOWR(0x84, dk_cxlflash_verify)
198 #define DK_CXLFLASH_RECOVER_AFU		CXL_IOWR(0x85, dk_cxlflash_recover_afu)
199 #define DK_CXLFLASH_MANAGE_LUN		CXL_IOWR(0x86, dk_cxlflash_manage_lun)
200 #define DK_CXLFLASH_USER_VIRTUAL	CXL_IOWR(0x87, dk_cxlflash_uvirtual)
201 #define DK_CXLFLASH_VLUN_RESIZE		CXL_IOWR(0x88, dk_cxlflash_resize)
202 #define DK_CXLFLASH_VLUN_CLONE		CXL_IOWR(0x89, dk_cxlflash_clone)
203 
204 /*
205  * Structure and flag definitions CXL Flash host ioctls
206  */
207 
208 #define HT_CXLFLASH_VERSION_0  0
209 
210 struct ht_cxlflash_hdr {
211 	__u16 version;		/* Version data */
212 	__u16 subcmd;		/* Sub-command */
213 	__u16 rsvd[2];		/* Reserved for future use */
214 	__u64 flags;		/* Input flags */
215 	__u64 return_flags;	/* Returned flags */
216 };
217 
218 /*
219  * Input flag definitions available to all host ioctls
220  *
221  * These are grown from the bottom-up with the intention that ioctl-specific
222  * input flag definitions would grow from the top-down, allowing the two sets
223  * to co-exist. While not required/enforced at this time, this provides future
224  * flexibility.
225  */
226 #define HT_CXLFLASH_HOST_READ				0x0000000000000000ULL
227 #define HT_CXLFLASH_HOST_WRITE				0x0000000000000001ULL
228 
229 #define HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN	0x0001
230 #define HT_CXLFLASH_LUN_PROVISION_SUBCMD_DELETE_LUN	0x0002
231 #define HT_CXLFLASH_LUN_PROVISION_SUBCMD_QUERY_PORT	0x0003
232 
233 struct ht_cxlflash_lun_provision {
234 	struct ht_cxlflash_hdr hdr; /* Common fields */
235 	__u16 port;		    /* Target port for provision request */
236 	__u16 reserved16[3];	    /* Reserved for future use */
237 	__u64 size;		    /* Size of LUN (4K blocks) */
238 	__u64 lun_id;		    /* SCSI LUN ID */
239 	__u8 wwid[CXLFLASH_WWID_LEN];/* Page83 WWID, NAA-6 */
240 	__u64 max_num_luns;	    /* Maximum number of LUNs provisioned */
241 	__u64 cur_num_luns;	    /* Current number of LUNs provisioned */
242 	__u64 max_cap_port;	    /* Total capacity for port (4K blocks) */
243 	__u64 cur_cap_port;	    /* Current capacity for port (4K blocks) */
244 	__u64 reserved[8];	    /* Reserved for future use */
245 };
246 
247 #define	HT_CXLFLASH_AFU_DEBUG_MAX_DATA_LEN		262144	/* 256K */
248 #define HT_CXLFLASH_AFU_DEBUG_SUBCMD_LEN		12
249 struct ht_cxlflash_afu_debug {
250 	struct ht_cxlflash_hdr hdr; /* Common fields */
251 	__u8 reserved8[4];	    /* Reserved for future use */
252 	__u8 afu_subcmd[HT_CXLFLASH_AFU_DEBUG_SUBCMD_LEN]; /* AFU subcommand,
253 							    * (pass through)
254 							    */
255 	__u64 data_ea;		    /* Data buffer effective address */
256 	__u32 data_len;		    /* Data buffer length */
257 	__u32 reserved32;	    /* Reserved for future use */
258 	__u64 reserved[8];	    /* Reserved for future use */
259 };
260 
261 union cxlflash_ht_ioctls {
262 	struct ht_cxlflash_lun_provision lun_provision;
263 	struct ht_cxlflash_afu_debug afu_debug;
264 };
265 
266 #define MAX_HT_CXLFLASH_IOCTL_SZ	(sizeof(union cxlflash_ht_ioctls))
267 
268 /*
269  * CXL Flash host ioctls start at the top of the reserved CXL_MAGIC
270  * region (0xBF) and grow downwards.
271  */
272 #define HT_CXLFLASH_LUN_PROVISION CXL_IOWR(0xBF, ht_cxlflash_lun_provision)
273 #define HT_CXLFLASH_AFU_DEBUG	  CXL_IOWR(0xBE, ht_cxlflash_afu_debug)
274 
275 
276 #endif /* ifndef _CXLFLASH_IOCTL_H */
277