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f204e0b8 IM |
1 | /* |
2 | * Copyright 2014 IBM Corp. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/pci_regs.h> | |
11 | #include <linux/pci_ids.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/sort.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/delay.h> | |
20 | #include <asm/opal.h> | |
21 | #include <asm/msi_bitmap.h> | |
22 | #include <asm/pci-bridge.h> /* for struct pci_controller */ | |
23 | #include <asm/pnv-pci.h> | |
62fa19d4 | 24 | #include <asm/io.h> |
f204e0b8 IM |
25 | |
26 | #include "cxl.h" | |
9e8df8a2 | 27 | #include <misc/cxl.h> |
f204e0b8 IM |
28 | |
29 | ||
30 | #define CXL_PCI_VSEC_ID 0x1280 | |
31 | #define CXL_VSEC_MIN_SIZE 0x80 | |
32 | ||
33 | #define CXL_READ_VSEC_LENGTH(dev, vsec, dest) \ | |
34 | { \ | |
35 | pci_read_config_word(dev, vsec + 0x6, dest); \ | |
36 | *dest >>= 4; \ | |
37 | } | |
38 | #define CXL_READ_VSEC_NAFUS(dev, vsec, dest) \ | |
39 | pci_read_config_byte(dev, vsec + 0x8, dest) | |
40 | ||
41 | #define CXL_READ_VSEC_STATUS(dev, vsec, dest) \ | |
42 | pci_read_config_byte(dev, vsec + 0x9, dest) | |
43 | #define CXL_STATUS_SECOND_PORT 0x80 | |
44 | #define CXL_STATUS_MSI_X_FULL 0x40 | |
45 | #define CXL_STATUS_MSI_X_SINGLE 0x20 | |
46 | #define CXL_STATUS_FLASH_RW 0x08 | |
47 | #define CXL_STATUS_FLASH_RO 0x04 | |
48 | #define CXL_STATUS_LOADABLE_AFU 0x02 | |
49 | #define CXL_STATUS_LOADABLE_PSL 0x01 | |
50 | /* If we see these features we won't try to use the card */ | |
51 | #define CXL_UNSUPPORTED_FEATURES \ | |
52 | (CXL_STATUS_MSI_X_FULL | CXL_STATUS_MSI_X_SINGLE) | |
53 | ||
54 | #define CXL_READ_VSEC_MODE_CONTROL(dev, vsec, dest) \ | |
55 | pci_read_config_byte(dev, vsec + 0xa, dest) | |
56 | #define CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val) \ | |
57 | pci_write_config_byte(dev, vsec + 0xa, val) | |
58 | #define CXL_VSEC_PROTOCOL_MASK 0xe0 | |
59 | #define CXL_VSEC_PROTOCOL_1024TB 0x80 | |
60 | #define CXL_VSEC_PROTOCOL_512TB 0x40 | |
61 | #define CXL_VSEC_PROTOCOL_256TB 0x20 /* Power 8 uses this */ | |
62 | #define CXL_VSEC_PROTOCOL_ENABLE 0x01 | |
63 | ||
64 | #define CXL_READ_VSEC_PSL_REVISION(dev, vsec, dest) \ | |
65 | pci_read_config_word(dev, vsec + 0xc, dest) | |
66 | #define CXL_READ_VSEC_CAIA_MINOR(dev, vsec, dest) \ | |
67 | pci_read_config_byte(dev, vsec + 0xe, dest) | |
68 | #define CXL_READ_VSEC_CAIA_MAJOR(dev, vsec, dest) \ | |
69 | pci_read_config_byte(dev, vsec + 0xf, dest) | |
70 | #define CXL_READ_VSEC_BASE_IMAGE(dev, vsec, dest) \ | |
71 | pci_read_config_word(dev, vsec + 0x10, dest) | |
72 | ||
73 | #define CXL_READ_VSEC_IMAGE_STATE(dev, vsec, dest) \ | |
74 | pci_read_config_byte(dev, vsec + 0x13, dest) | |
75 | #define CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, val) \ | |
76 | pci_write_config_byte(dev, vsec + 0x13, val) | |
77 | #define CXL_VSEC_USER_IMAGE_LOADED 0x80 /* RO */ | |
78 | #define CXL_VSEC_PERST_LOADS_IMAGE 0x20 /* RW */ | |
79 | #define CXL_VSEC_PERST_SELECT_USER 0x10 /* RW */ | |
80 | ||
81 | #define CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, dest) \ | |
82 | pci_read_config_dword(dev, vsec + 0x20, dest) | |
83 | #define CXL_READ_VSEC_AFU_DESC_SIZE(dev, vsec, dest) \ | |
84 | pci_read_config_dword(dev, vsec + 0x24, dest) | |
85 | #define CXL_READ_VSEC_PS_OFF(dev, vsec, dest) \ | |
86 | pci_read_config_dword(dev, vsec + 0x28, dest) | |
87 | #define CXL_READ_VSEC_PS_SIZE(dev, vsec, dest) \ | |
88 | pci_read_config_dword(dev, vsec + 0x2c, dest) | |
89 | ||
90 | ||
91 | /* This works a little different than the p1/p2 register accesses to make it | |
92 | * easier to pull out individual fields */ | |
93 | #define AFUD_READ(afu, off) in_be64(afu->afu_desc_mmio + off) | |
bfcdc8ff | 94 | #define AFUD_READ_LE(afu, off) in_le64(afu->afu_desc_mmio + off) |
f204e0b8 IM |
95 | #define EXTRACT_PPC_BIT(val, bit) (!!(val & PPC_BIT(bit))) |
96 | #define EXTRACT_PPC_BITS(val, bs, be) ((val & PPC_BITMASK(bs, be)) >> PPC_BITLSHIFT(be)) | |
97 | ||
98 | #define AFUD_READ_INFO(afu) AFUD_READ(afu, 0x0) | |
99 | #define AFUD_NUM_INTS_PER_PROC(val) EXTRACT_PPC_BITS(val, 0, 15) | |
100 | #define AFUD_NUM_PROCS(val) EXTRACT_PPC_BITS(val, 16, 31) | |
101 | #define AFUD_NUM_CRS(val) EXTRACT_PPC_BITS(val, 32, 47) | |
102 | #define AFUD_MULTIMODE(val) EXTRACT_PPC_BIT(val, 48) | |
103 | #define AFUD_PUSH_BLOCK_TRANSFER(val) EXTRACT_PPC_BIT(val, 55) | |
104 | #define AFUD_DEDICATED_PROCESS(val) EXTRACT_PPC_BIT(val, 59) | |
105 | #define AFUD_AFU_DIRECTED(val) EXTRACT_PPC_BIT(val, 61) | |
106 | #define AFUD_TIME_SLICED(val) EXTRACT_PPC_BIT(val, 63) | |
107 | #define AFUD_READ_CR(afu) AFUD_READ(afu, 0x20) | |
108 | #define AFUD_CR_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) | |
109 | #define AFUD_READ_CR_OFF(afu) AFUD_READ(afu, 0x28) | |
110 | #define AFUD_READ_PPPSA(afu) AFUD_READ(afu, 0x30) | |
111 | #define AFUD_PPPSA_PP(val) EXTRACT_PPC_BIT(val, 6) | |
112 | #define AFUD_PPPSA_PSA(val) EXTRACT_PPC_BIT(val, 7) | |
113 | #define AFUD_PPPSA_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) | |
114 | #define AFUD_READ_PPPSA_OFF(afu) AFUD_READ(afu, 0x38) | |
115 | #define AFUD_READ_EB(afu) AFUD_READ(afu, 0x40) | |
116 | #define AFUD_EB_LEN(val) EXTRACT_PPC_BITS(val, 8, 63) | |
117 | #define AFUD_READ_EB_OFF(afu) AFUD_READ(afu, 0x48) | |
118 | ||
b087e619 IM |
119 | u16 cxl_afu_cr_read16(struct cxl_afu *afu, int cr, u64 off) |
120 | { | |
121 | u64 aligned_off = off & ~0x3L; | |
122 | u32 val; | |
123 | ||
124 | val = cxl_afu_cr_read32(afu, cr, aligned_off); | |
125 | return (val >> ((off & 0x2) * 8)) & 0xffff; | |
126 | } | |
127 | ||
128 | u8 cxl_afu_cr_read8(struct cxl_afu *afu, int cr, u64 off) | |
129 | { | |
130 | u64 aligned_off = off & ~0x3L; | |
131 | u32 val; | |
132 | ||
133 | val = cxl_afu_cr_read32(afu, cr, aligned_off); | |
134 | return (val >> ((off & 0x3) * 8)) & 0xff; | |
135 | } | |
136 | ||
f47f966f | 137 | static const struct pci_device_id cxl_pci_tbl[] = { |
f204e0b8 IM |
138 | { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0477), }, |
139 | { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x044b), }, | |
140 | { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x04cf), }, | |
141 | { PCI_DEVICE_CLASS(0x120000, ~0), }, | |
142 | ||
143 | { } | |
144 | }; | |
145 | MODULE_DEVICE_TABLE(pci, cxl_pci_tbl); | |
146 | ||
147 | ||
148 | /* | |
149 | * Mostly using these wrappers to avoid confusion: | |
150 | * priv 1 is BAR2, while priv 2 is BAR0 | |
151 | */ | |
152 | static inline resource_size_t p1_base(struct pci_dev *dev) | |
153 | { | |
154 | return pci_resource_start(dev, 2); | |
155 | } | |
156 | ||
157 | static inline resource_size_t p1_size(struct pci_dev *dev) | |
158 | { | |
159 | return pci_resource_len(dev, 2); | |
160 | } | |
161 | ||
162 | static inline resource_size_t p2_base(struct pci_dev *dev) | |
163 | { | |
164 | return pci_resource_start(dev, 0); | |
165 | } | |
166 | ||
167 | static inline resource_size_t p2_size(struct pci_dev *dev) | |
168 | { | |
169 | return pci_resource_len(dev, 0); | |
170 | } | |
171 | ||
172 | static int find_cxl_vsec(struct pci_dev *dev) | |
173 | { | |
174 | int vsec = 0; | |
175 | u16 val; | |
176 | ||
177 | while ((vsec = pci_find_next_ext_capability(dev, vsec, PCI_EXT_CAP_ID_VNDR))) { | |
178 | pci_read_config_word(dev, vsec + 0x4, &val); | |
179 | if (val == CXL_PCI_VSEC_ID) | |
180 | return vsec; | |
181 | } | |
182 | return 0; | |
183 | ||
184 | } | |
185 | ||
186 | static void dump_cxl_config_space(struct pci_dev *dev) | |
187 | { | |
188 | int vsec; | |
189 | u32 val; | |
190 | ||
191 | dev_info(&dev->dev, "dump_cxl_config_space\n"); | |
192 | ||
193 | pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &val); | |
194 | dev_info(&dev->dev, "BAR0: %#.8x\n", val); | |
195 | pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &val); | |
196 | dev_info(&dev->dev, "BAR1: %#.8x\n", val); | |
197 | pci_read_config_dword(dev, PCI_BASE_ADDRESS_2, &val); | |
198 | dev_info(&dev->dev, "BAR2: %#.8x\n", val); | |
199 | pci_read_config_dword(dev, PCI_BASE_ADDRESS_3, &val); | |
200 | dev_info(&dev->dev, "BAR3: %#.8x\n", val); | |
201 | pci_read_config_dword(dev, PCI_BASE_ADDRESS_4, &val); | |
202 | dev_info(&dev->dev, "BAR4: %#.8x\n", val); | |
203 | pci_read_config_dword(dev, PCI_BASE_ADDRESS_5, &val); | |
204 | dev_info(&dev->dev, "BAR5: %#.8x\n", val); | |
205 | ||
206 | dev_info(&dev->dev, "p1 regs: %#llx, len: %#llx\n", | |
207 | p1_base(dev), p1_size(dev)); | |
208 | dev_info(&dev->dev, "p2 regs: %#llx, len: %#llx\n", | |
f2931069 | 209 | p2_base(dev), p2_size(dev)); |
f204e0b8 IM |
210 | dev_info(&dev->dev, "BAR 4/5: %#llx, len: %#llx\n", |
211 | pci_resource_start(dev, 4), pci_resource_len(dev, 4)); | |
212 | ||
213 | if (!(vsec = find_cxl_vsec(dev))) | |
214 | return; | |
215 | ||
216 | #define show_reg(name, what) \ | |
217 | dev_info(&dev->dev, "cxl vsec: %30s: %#x\n", name, what) | |
218 | ||
219 | pci_read_config_dword(dev, vsec + 0x0, &val); | |
220 | show_reg("Cap ID", (val >> 0) & 0xffff); | |
221 | show_reg("Cap Ver", (val >> 16) & 0xf); | |
222 | show_reg("Next Cap Ptr", (val >> 20) & 0xfff); | |
223 | pci_read_config_dword(dev, vsec + 0x4, &val); | |
224 | show_reg("VSEC ID", (val >> 0) & 0xffff); | |
225 | show_reg("VSEC Rev", (val >> 16) & 0xf); | |
226 | show_reg("VSEC Length", (val >> 20) & 0xfff); | |
227 | pci_read_config_dword(dev, vsec + 0x8, &val); | |
228 | show_reg("Num AFUs", (val >> 0) & 0xff); | |
229 | show_reg("Status", (val >> 8) & 0xff); | |
230 | show_reg("Mode Control", (val >> 16) & 0xff); | |
231 | show_reg("Reserved", (val >> 24) & 0xff); | |
232 | pci_read_config_dword(dev, vsec + 0xc, &val); | |
233 | show_reg("PSL Rev", (val >> 0) & 0xffff); | |
234 | show_reg("CAIA Ver", (val >> 16) & 0xffff); | |
235 | pci_read_config_dword(dev, vsec + 0x10, &val); | |
236 | show_reg("Base Image Rev", (val >> 0) & 0xffff); | |
237 | show_reg("Reserved", (val >> 16) & 0x0fff); | |
238 | show_reg("Image Control", (val >> 28) & 0x3); | |
239 | show_reg("Reserved", (val >> 30) & 0x1); | |
240 | show_reg("Image Loaded", (val >> 31) & 0x1); | |
241 | ||
242 | pci_read_config_dword(dev, vsec + 0x14, &val); | |
243 | show_reg("Reserved", val); | |
244 | pci_read_config_dword(dev, vsec + 0x18, &val); | |
245 | show_reg("Reserved", val); | |
246 | pci_read_config_dword(dev, vsec + 0x1c, &val); | |
247 | show_reg("Reserved", val); | |
248 | ||
249 | pci_read_config_dword(dev, vsec + 0x20, &val); | |
250 | show_reg("AFU Descriptor Offset", val); | |
251 | pci_read_config_dword(dev, vsec + 0x24, &val); | |
252 | show_reg("AFU Descriptor Size", val); | |
253 | pci_read_config_dword(dev, vsec + 0x28, &val); | |
254 | show_reg("Problem State Offset", val); | |
255 | pci_read_config_dword(dev, vsec + 0x2c, &val); | |
256 | show_reg("Problem State Size", val); | |
257 | ||
258 | pci_read_config_dword(dev, vsec + 0x30, &val); | |
259 | show_reg("Reserved", val); | |
260 | pci_read_config_dword(dev, vsec + 0x34, &val); | |
261 | show_reg("Reserved", val); | |
262 | pci_read_config_dword(dev, vsec + 0x38, &val); | |
263 | show_reg("Reserved", val); | |
264 | pci_read_config_dword(dev, vsec + 0x3c, &val); | |
265 | show_reg("Reserved", val); | |
266 | ||
267 | pci_read_config_dword(dev, vsec + 0x40, &val); | |
268 | show_reg("PSL Programming Port", val); | |
269 | pci_read_config_dword(dev, vsec + 0x44, &val); | |
270 | show_reg("PSL Programming Control", val); | |
271 | ||
272 | pci_read_config_dword(dev, vsec + 0x48, &val); | |
273 | show_reg("Reserved", val); | |
274 | pci_read_config_dword(dev, vsec + 0x4c, &val); | |
275 | show_reg("Reserved", val); | |
276 | ||
277 | pci_read_config_dword(dev, vsec + 0x50, &val); | |
278 | show_reg("Flash Address Register", val); | |
279 | pci_read_config_dword(dev, vsec + 0x54, &val); | |
280 | show_reg("Flash Size Register", val); | |
281 | pci_read_config_dword(dev, vsec + 0x58, &val); | |
282 | show_reg("Flash Status/Control Register", val); | |
283 | pci_read_config_dword(dev, vsec + 0x58, &val); | |
284 | show_reg("Flash Data Port", val); | |
285 | ||
286 | #undef show_reg | |
287 | } | |
288 | ||
289 | static void dump_afu_descriptor(struct cxl_afu *afu) | |
290 | { | |
bfcdc8ff MN |
291 | u64 val, afu_cr_num, afu_cr_off, afu_cr_len; |
292 | int i; | |
f204e0b8 IM |
293 | |
294 | #define show_reg(name, what) \ | |
295 | dev_info(&afu->dev, "afu desc: %30s: %#llx\n", name, what) | |
296 | ||
297 | val = AFUD_READ_INFO(afu); | |
298 | show_reg("num_ints_per_process", AFUD_NUM_INTS_PER_PROC(val)); | |
299 | show_reg("num_of_processes", AFUD_NUM_PROCS(val)); | |
300 | show_reg("num_of_afu_CRs", AFUD_NUM_CRS(val)); | |
301 | show_reg("req_prog_mode", val & 0xffffULL); | |
bfcdc8ff | 302 | afu_cr_num = AFUD_NUM_CRS(val); |
f204e0b8 IM |
303 | |
304 | val = AFUD_READ(afu, 0x8); | |
305 | show_reg("Reserved", val); | |
306 | val = AFUD_READ(afu, 0x10); | |
307 | show_reg("Reserved", val); | |
308 | val = AFUD_READ(afu, 0x18); | |
309 | show_reg("Reserved", val); | |
310 | ||
311 | val = AFUD_READ_CR(afu); | |
312 | show_reg("Reserved", (val >> (63-7)) & 0xff); | |
313 | show_reg("AFU_CR_len", AFUD_CR_LEN(val)); | |
bfcdc8ff | 314 | afu_cr_len = AFUD_CR_LEN(val) * 256; |
f204e0b8 IM |
315 | |
316 | val = AFUD_READ_CR_OFF(afu); | |
bfcdc8ff | 317 | afu_cr_off = val; |
f204e0b8 IM |
318 | show_reg("AFU_CR_offset", val); |
319 | ||
320 | val = AFUD_READ_PPPSA(afu); | |
321 | show_reg("PerProcessPSA_control", (val >> (63-7)) & 0xff); | |
322 | show_reg("PerProcessPSA Length", AFUD_PPPSA_LEN(val)); | |
323 | ||
324 | val = AFUD_READ_PPPSA_OFF(afu); | |
325 | show_reg("PerProcessPSA_offset", val); | |
326 | ||
327 | val = AFUD_READ_EB(afu); | |
328 | show_reg("Reserved", (val >> (63-7)) & 0xff); | |
329 | show_reg("AFU_EB_len", AFUD_EB_LEN(val)); | |
330 | ||
331 | val = AFUD_READ_EB_OFF(afu); | |
332 | show_reg("AFU_EB_offset", val); | |
333 | ||
bfcdc8ff MN |
334 | for (i = 0; i < afu_cr_num; i++) { |
335 | val = AFUD_READ_LE(afu, afu_cr_off + i * afu_cr_len); | |
336 | show_reg("CR Vendor", val & 0xffff); | |
337 | show_reg("CR Device", (val >> 16) & 0xffff); | |
338 | } | |
f204e0b8 IM |
339 | #undef show_reg |
340 | } | |
341 | ||
342 | static int init_implementation_adapter_regs(struct cxl *adapter, struct pci_dev *dev) | |
343 | { | |
344 | struct device_node *np; | |
345 | const __be32 *prop; | |
346 | u64 psl_dsnctl; | |
347 | u64 chipid; | |
348 | ||
6f963ec2 | 349 | if (!(np = pnv_pci_get_phb_node(dev))) |
f204e0b8 IM |
350 | return -ENODEV; |
351 | ||
352 | while (np && !(prop = of_get_property(np, "ibm,chip-id", NULL))) | |
353 | np = of_get_next_parent(np); | |
354 | if (!np) | |
355 | return -ENODEV; | |
356 | chipid = be32_to_cpup(prop); | |
357 | of_node_put(np); | |
358 | ||
359 | /* Tell PSL where to route data to */ | |
360 | psl_dsnctl = 0x02E8900002000000ULL | (chipid << (63-5)); | |
361 | cxl_p1_write(adapter, CXL_PSL_DSNDCTL, psl_dsnctl); | |
362 | cxl_p1_write(adapter, CXL_PSL_RESLCKTO, 0x20000000200ULL); | |
363 | /* snoop write mask */ | |
364 | cxl_p1_write(adapter, CXL_PSL_SNWRALLOC, 0x00000000FFFFFFFFULL); | |
365 | /* set fir_accum */ | |
366 | cxl_p1_write(adapter, CXL_PSL_FIR_CNTL, 0x0800000000000000ULL); | |
367 | /* for debugging with trace arrays */ | |
368 | cxl_p1_write(adapter, CXL_PSL_TRACE, 0x0000FF7C00000000ULL); | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
390fd592 PB |
373 | #define TBSYNC_CNT(n) (((u64)n & 0x7) << (63-6)) |
374 | #define _2048_250MHZ_CYCLES 1 | |
375 | ||
376 | static int cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) | |
377 | { | |
378 | u64 psl_tb; | |
379 | int delta; | |
380 | unsigned int retry = 0; | |
381 | struct device_node *np; | |
382 | ||
383 | if (!(np = pnv_pci_get_phb_node(dev))) | |
384 | return -ENODEV; | |
385 | ||
386 | /* Do not fail when CAPP timebase sync is not supported by OPAL */ | |
387 | of_node_get(np); | |
388 | if (! of_get_property(np, "ibm,capp-timebase-sync", NULL)) { | |
389 | of_node_put(np); | |
390 | pr_err("PSL: Timebase sync: OPAL support missing\n"); | |
391 | return 0; | |
392 | } | |
393 | of_node_put(np); | |
394 | ||
395 | /* | |
396 | * Setup PSL Timebase Control and Status register | |
397 | * with the recommended Timebase Sync Count value | |
398 | */ | |
399 | cxl_p1_write(adapter, CXL_PSL_TB_CTLSTAT, | |
400 | TBSYNC_CNT(2 * _2048_250MHZ_CYCLES)); | |
401 | ||
402 | /* Enable PSL Timebase */ | |
403 | cxl_p1_write(adapter, CXL_PSL_Control, 0x0000000000000000); | |
404 | cxl_p1_write(adapter, CXL_PSL_Control, CXL_PSL_Control_tb); | |
405 | ||
406 | /* Wait until CORE TB and PSL TB difference <= 16usecs */ | |
407 | do { | |
408 | msleep(1); | |
409 | if (retry++ > 5) { | |
410 | pr_err("PSL: Timebase sync: giving up!\n"); | |
411 | return -EIO; | |
412 | } | |
413 | psl_tb = cxl_p1_read(adapter, CXL_PSL_Timebase); | |
414 | delta = mftb() - psl_tb; | |
415 | if (delta < 0) | |
416 | delta = -delta; | |
417 | } while (cputime_to_usecs(delta) > 16); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
f204e0b8 IM |
422 | static int init_implementation_afu_regs(struct cxl_afu *afu) |
423 | { | |
424 | /* read/write masks for this slice */ | |
425 | cxl_p1n_write(afu, CXL_PSL_APCALLOC_A, 0xFFFFFFFEFEFEFEFEULL); | |
426 | /* APC read/write masks for this slice */ | |
427 | cxl_p1n_write(afu, CXL_PSL_COALLOC_A, 0xFF000000FEFEFEFEULL); | |
428 | /* for debugging with trace arrays */ | |
429 | cxl_p1n_write(afu, CXL_PSL_SLICE_TRACE, 0x0000FFFF00000000ULL); | |
d6a6af2c | 430 | cxl_p1n_write(afu, CXL_PSL_RXCTL_A, CXL_PSL_RXCTL_AFUHP_4S); |
f204e0b8 IM |
431 | |
432 | return 0; | |
433 | } | |
434 | ||
435 | int cxl_setup_irq(struct cxl *adapter, unsigned int hwirq, | |
436 | unsigned int virq) | |
437 | { | |
438 | struct pci_dev *dev = to_pci_dev(adapter->dev.parent); | |
439 | ||
440 | return pnv_cxl_ioda_msi_setup(dev, hwirq, virq); | |
441 | } | |
442 | ||
4beb5421 RG |
443 | int cxl_update_image_control(struct cxl *adapter) |
444 | { | |
445 | struct pci_dev *dev = to_pci_dev(adapter->dev.parent); | |
446 | int rc; | |
447 | int vsec; | |
448 | u8 image_state; | |
449 | ||
450 | if (!(vsec = find_cxl_vsec(dev))) { | |
451 | dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); | |
452 | return -ENODEV; | |
453 | } | |
454 | ||
455 | if ((rc = CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state))) { | |
456 | dev_err(&dev->dev, "failed to read image state: %i\n", rc); | |
457 | return rc; | |
458 | } | |
459 | ||
460 | if (adapter->perst_loads_image) | |
461 | image_state |= CXL_VSEC_PERST_LOADS_IMAGE; | |
462 | else | |
463 | image_state &= ~CXL_VSEC_PERST_LOADS_IMAGE; | |
464 | ||
465 | if (adapter->perst_select_user) | |
466 | image_state |= CXL_VSEC_PERST_SELECT_USER; | |
467 | else | |
468 | image_state &= ~CXL_VSEC_PERST_SELECT_USER; | |
469 | ||
470 | if ((rc = CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, image_state))) { | |
471 | dev_err(&dev->dev, "failed to update image control: %i\n", rc); | |
472 | return rc; | |
473 | } | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
f204e0b8 IM |
478 | int cxl_alloc_one_irq(struct cxl *adapter) |
479 | { | |
480 | struct pci_dev *dev = to_pci_dev(adapter->dev.parent); | |
481 | ||
482 | return pnv_cxl_alloc_hwirqs(dev, 1); | |
483 | } | |
484 | ||
485 | void cxl_release_one_irq(struct cxl *adapter, int hwirq) | |
486 | { | |
487 | struct pci_dev *dev = to_pci_dev(adapter->dev.parent); | |
488 | ||
489 | return pnv_cxl_release_hwirqs(dev, hwirq, 1); | |
490 | } | |
491 | ||
492 | int cxl_alloc_irq_ranges(struct cxl_irq_ranges *irqs, struct cxl *adapter, unsigned int num) | |
493 | { | |
494 | struct pci_dev *dev = to_pci_dev(adapter->dev.parent); | |
495 | ||
496 | return pnv_cxl_alloc_hwirq_ranges(irqs, dev, num); | |
497 | } | |
498 | ||
499 | void cxl_release_irq_ranges(struct cxl_irq_ranges *irqs, struct cxl *adapter) | |
500 | { | |
501 | struct pci_dev *dev = to_pci_dev(adapter->dev.parent); | |
502 | ||
503 | pnv_cxl_release_hwirq_ranges(irqs, dev); | |
504 | } | |
505 | ||
506 | static int setup_cxl_bars(struct pci_dev *dev) | |
507 | { | |
508 | /* Safety check in case we get backported to < 3.17 without M64 */ | |
509 | if ((p1_base(dev) < 0x100000000ULL) || | |
510 | (p2_base(dev) < 0x100000000ULL)) { | |
511 | dev_err(&dev->dev, "ABORTING: M32 BAR assignment incompatible with CXL\n"); | |
512 | return -ENODEV; | |
513 | } | |
514 | ||
515 | /* | |
516 | * BAR 4/5 has a special meaning for CXL and must be programmed with a | |
517 | * special value corresponding to the CXL protocol address range. | |
518 | * For POWER 8 that means bits 48:49 must be set to 10 | |
519 | */ | |
520 | pci_write_config_dword(dev, PCI_BASE_ADDRESS_4, 0x00000000); | |
521 | pci_write_config_dword(dev, PCI_BASE_ADDRESS_5, 0x00020000); | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | /* pciex node: ibm,opal-m64-window = <0x3d058 0x0 0x3d058 0x0 0x8 0x0>; */ | |
527 | static int switch_card_to_cxl(struct pci_dev *dev) | |
528 | { | |
529 | int vsec; | |
530 | u8 val; | |
531 | int rc; | |
532 | ||
533 | dev_info(&dev->dev, "switch card to CXL\n"); | |
534 | ||
535 | if (!(vsec = find_cxl_vsec(dev))) { | |
536 | dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); | |
537 | return -ENODEV; | |
538 | } | |
539 | ||
540 | if ((rc = CXL_READ_VSEC_MODE_CONTROL(dev, vsec, &val))) { | |
541 | dev_err(&dev->dev, "failed to read current mode control: %i", rc); | |
542 | return rc; | |
543 | } | |
544 | val &= ~CXL_VSEC_PROTOCOL_MASK; | |
545 | val |= CXL_VSEC_PROTOCOL_256TB | CXL_VSEC_PROTOCOL_ENABLE; | |
546 | if ((rc = CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val))) { | |
547 | dev_err(&dev->dev, "failed to enable CXL protocol: %i", rc); | |
548 | return rc; | |
549 | } | |
550 | /* | |
551 | * The CAIA spec (v0.12 11.6 Bi-modal Device Support) states | |
552 | * we must wait 100ms after this mode switch before touching | |
553 | * PCIe config space. | |
554 | */ | |
555 | msleep(100); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | static int cxl_map_slice_regs(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) | |
561 | { | |
562 | u64 p1n_base, p2n_base, afu_desc; | |
563 | const u64 p1n_size = 0x100; | |
564 | const u64 p2n_size = 0x1000; | |
565 | ||
566 | p1n_base = p1_base(dev) + 0x10000 + (afu->slice * p1n_size); | |
567 | p2n_base = p2_base(dev) + (afu->slice * p2n_size); | |
568 | afu->psn_phys = p2_base(dev) + (adapter->ps_off + (afu->slice * adapter->ps_size)); | |
569 | afu_desc = p2_base(dev) + adapter->afu_desc_off + (afu->slice * adapter->afu_desc_size); | |
570 | ||
571 | if (!(afu->p1n_mmio = ioremap(p1n_base, p1n_size))) | |
572 | goto err; | |
573 | if (!(afu->p2n_mmio = ioremap(p2n_base, p2n_size))) | |
574 | goto err1; | |
575 | if (afu_desc) { | |
576 | if (!(afu->afu_desc_mmio = ioremap(afu_desc, adapter->afu_desc_size))) | |
577 | goto err2; | |
578 | } | |
579 | ||
580 | return 0; | |
581 | err2: | |
582 | iounmap(afu->p2n_mmio); | |
583 | err1: | |
584 | iounmap(afu->p1n_mmio); | |
585 | err: | |
586 | dev_err(&afu->dev, "Error mapping AFU MMIO regions\n"); | |
587 | return -ENOMEM; | |
588 | } | |
589 | ||
590 | static void cxl_unmap_slice_regs(struct cxl_afu *afu) | |
591 | { | |
575e6986 | 592 | if (afu->p2n_mmio) { |
f204e0b8 | 593 | iounmap(afu->p2n_mmio); |
575e6986 DA |
594 | afu->p2n_mmio = NULL; |
595 | } | |
596 | if (afu->p1n_mmio) { | |
f204e0b8 | 597 | iounmap(afu->p1n_mmio); |
575e6986 DA |
598 | afu->p1n_mmio = NULL; |
599 | } | |
600 | if (afu->afu_desc_mmio) { | |
601 | iounmap(afu->afu_desc_mmio); | |
602 | afu->afu_desc_mmio = NULL; | |
603 | } | |
f204e0b8 IM |
604 | } |
605 | ||
606 | static void cxl_release_afu(struct device *dev) | |
607 | { | |
608 | struct cxl_afu *afu = to_cxl_afu(dev); | |
609 | ||
610 | pr_devel("cxl_release_afu\n"); | |
611 | ||
bd664f89 | 612 | idr_destroy(&afu->contexts_idr); |
05155772 DA |
613 | cxl_release_spa(afu); |
614 | ||
f204e0b8 IM |
615 | kfree(afu); |
616 | } | |
617 | ||
618 | static struct cxl_afu *cxl_alloc_afu(struct cxl *adapter, int slice) | |
619 | { | |
620 | struct cxl_afu *afu; | |
621 | ||
622 | if (!(afu = kzalloc(sizeof(struct cxl_afu), GFP_KERNEL))) | |
623 | return NULL; | |
624 | ||
625 | afu->adapter = adapter; | |
626 | afu->dev.parent = &adapter->dev; | |
627 | afu->dev.release = cxl_release_afu; | |
628 | afu->slice = slice; | |
629 | idr_init(&afu->contexts_idr); | |
ee41d11d | 630 | mutex_init(&afu->contexts_lock); |
f204e0b8 IM |
631 | spin_lock_init(&afu->afu_cntl_lock); |
632 | mutex_init(&afu->spa_mutex); | |
633 | ||
634 | afu->prefault_mode = CXL_PREFAULT_NONE; | |
635 | afu->irqs_max = afu->adapter->user_irqs; | |
636 | ||
637 | return afu; | |
638 | } | |
639 | ||
640 | /* Expects AFU struct to have recently been zeroed out */ | |
641 | static int cxl_read_afu_descriptor(struct cxl_afu *afu) | |
642 | { | |
643 | u64 val; | |
644 | ||
645 | val = AFUD_READ_INFO(afu); | |
646 | afu->pp_irqs = AFUD_NUM_INTS_PER_PROC(val); | |
647 | afu->max_procs_virtualised = AFUD_NUM_PROCS(val); | |
b087e619 | 648 | afu->crs_num = AFUD_NUM_CRS(val); |
f204e0b8 IM |
649 | |
650 | if (AFUD_AFU_DIRECTED(val)) | |
651 | afu->modes_supported |= CXL_MODE_DIRECTED; | |
652 | if (AFUD_DEDICATED_PROCESS(val)) | |
653 | afu->modes_supported |= CXL_MODE_DEDICATED; | |
654 | if (AFUD_TIME_SLICED(val)) | |
655 | afu->modes_supported |= CXL_MODE_TIME_SLICED; | |
656 | ||
657 | val = AFUD_READ_PPPSA(afu); | |
658 | afu->pp_size = AFUD_PPPSA_LEN(val) * 4096; | |
659 | afu->psa = AFUD_PPPSA_PSA(val); | |
660 | if ((afu->pp_psa = AFUD_PPPSA_PP(val))) | |
661 | afu->pp_offset = AFUD_READ_PPPSA_OFF(afu); | |
662 | ||
b087e619 IM |
663 | val = AFUD_READ_CR(afu); |
664 | afu->crs_len = AFUD_CR_LEN(val) * 256; | |
665 | afu->crs_offset = AFUD_READ_CR_OFF(afu); | |
666 | ||
e36f6fe1 VJ |
667 | |
668 | /* eb_len is in multiple of 4K */ | |
669 | afu->eb_len = AFUD_EB_LEN(AFUD_READ_EB(afu)) * 4096; | |
670 | afu->eb_offset = AFUD_READ_EB_OFF(afu); | |
671 | ||
672 | /* eb_off is 4K aligned so lower 12 bits are always zero */ | |
673 | if (EXTRACT_PPC_BITS(afu->eb_offset, 0, 11) != 0) { | |
674 | dev_warn(&afu->dev, | |
675 | "Invalid AFU error buffer offset %Lx\n", | |
676 | afu->eb_offset); | |
677 | dev_info(&afu->dev, | |
678 | "Ignoring AFU error buffer in the descriptor\n"); | |
679 | /* indicate that no afu buffer exists */ | |
680 | afu->eb_len = 0; | |
681 | } | |
682 | ||
f204e0b8 IM |
683 | return 0; |
684 | } | |
685 | ||
686 | static int cxl_afu_descriptor_looks_ok(struct cxl_afu *afu) | |
687 | { | |
3d5be039 IM |
688 | int i; |
689 | ||
f204e0b8 IM |
690 | if (afu->psa && afu->adapter->ps_size < |
691 | (afu->pp_offset + afu->pp_size*afu->max_procs_virtualised)) { | |
692 | dev_err(&afu->dev, "per-process PSA can't fit inside the PSA!\n"); | |
693 | return -ENODEV; | |
694 | } | |
695 | ||
696 | if (afu->pp_psa && (afu->pp_size < PAGE_SIZE)) | |
697 | dev_warn(&afu->dev, "AFU uses < PAGE_SIZE per-process PSA!"); | |
698 | ||
3d5be039 IM |
699 | for (i = 0; i < afu->crs_num; i++) { |
700 | if ((cxl_afu_cr_read32(afu, i, 0) == 0)) { | |
701 | dev_err(&afu->dev, "ABORTING: AFU configuration record %i is invalid\n", i); | |
702 | return -EINVAL; | |
703 | } | |
704 | } | |
705 | ||
f204e0b8 IM |
706 | return 0; |
707 | } | |
708 | ||
709 | static int sanitise_afu_regs(struct cxl_afu *afu) | |
710 | { | |
711 | u64 reg; | |
712 | ||
713 | /* | |
714 | * Clear out any regs that contain either an IVTE or address or may be | |
715 | * waiting on an acknowledgement to try to be a bit safer as we bring | |
716 | * it online | |
717 | */ | |
718 | reg = cxl_p2n_read(afu, CXL_AFU_Cntl_An); | |
719 | if ((reg & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) { | |
de369538 | 720 | dev_warn(&afu->dev, "WARNING: AFU was not disabled: %#016llx\n", reg); |
b12994fb | 721 | if (__cxl_afu_reset(afu)) |
f204e0b8 IM |
722 | return -EIO; |
723 | if (cxl_afu_disable(afu)) | |
724 | return -EIO; | |
725 | if (cxl_psl_purge(afu)) | |
726 | return -EIO; | |
727 | } | |
728 | cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0x0000000000000000); | |
729 | cxl_p1n_write(afu, CXL_PSL_IVTE_Limit_An, 0x0000000000000000); | |
730 | cxl_p1n_write(afu, CXL_PSL_IVTE_Offset_An, 0x0000000000000000); | |
731 | cxl_p1n_write(afu, CXL_PSL_AMBAR_An, 0x0000000000000000); | |
732 | cxl_p1n_write(afu, CXL_PSL_SPOffset_An, 0x0000000000000000); | |
733 | cxl_p1n_write(afu, CXL_HAURP_An, 0x0000000000000000); | |
734 | cxl_p2n_write(afu, CXL_CSRP_An, 0x0000000000000000); | |
735 | cxl_p2n_write(afu, CXL_AURP1_An, 0x0000000000000000); | |
736 | cxl_p2n_write(afu, CXL_AURP0_An, 0x0000000000000000); | |
737 | cxl_p2n_write(afu, CXL_SSTP1_An, 0x0000000000000000); | |
738 | cxl_p2n_write(afu, CXL_SSTP0_An, 0x0000000000000000); | |
739 | reg = cxl_p2n_read(afu, CXL_PSL_DSISR_An); | |
740 | if (reg) { | |
de369538 | 741 | dev_warn(&afu->dev, "AFU had pending DSISR: %#016llx\n", reg); |
f204e0b8 IM |
742 | if (reg & CXL_PSL_DSISR_TRANS) |
743 | cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE); | |
744 | else | |
745 | cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A); | |
746 | } | |
747 | reg = cxl_p1n_read(afu, CXL_PSL_SERR_An); | |
748 | if (reg) { | |
749 | if (reg & ~0xffff) | |
de369538 | 750 | dev_warn(&afu->dev, "AFU had pending SERR: %#016llx\n", reg); |
f204e0b8 IM |
751 | cxl_p1n_write(afu, CXL_PSL_SERR_An, reg & ~0xffff); |
752 | } | |
753 | reg = cxl_p2n_read(afu, CXL_PSL_ErrStat_An); | |
754 | if (reg) { | |
de369538 | 755 | dev_warn(&afu->dev, "AFU had pending error status: %#016llx\n", reg); |
f204e0b8 IM |
756 | cxl_p2n_write(afu, CXL_PSL_ErrStat_An, reg); |
757 | } | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
e36f6fe1 VJ |
762 | #define ERR_BUFF_MAX_COPY_SIZE PAGE_SIZE |
763 | /* | |
764 | * afu_eb_read: | |
765 | * Called from sysfs and reads the afu error info buffer. The h/w only supports | |
766 | * 4/8 bytes aligned access. So in case the requested offset/count arent 8 byte | |
767 | * aligned the function uses a bounce buffer which can be max PAGE_SIZE. | |
768 | */ | |
769 | ssize_t cxl_afu_read_err_buffer(struct cxl_afu *afu, char *buf, | |
770 | loff_t off, size_t count) | |
771 | { | |
772 | loff_t aligned_start, aligned_end; | |
773 | size_t aligned_length; | |
774 | void *tbuf; | |
775 | const void __iomem *ebuf = afu->afu_desc_mmio + afu->eb_offset; | |
776 | ||
777 | if (count == 0 || off < 0 || (size_t)off >= afu->eb_len) | |
778 | return 0; | |
779 | ||
780 | /* calculate aligned read window */ | |
781 | count = min((size_t)(afu->eb_len - off), count); | |
782 | aligned_start = round_down(off, 8); | |
783 | aligned_end = round_up(off + count, 8); | |
784 | aligned_length = aligned_end - aligned_start; | |
785 | ||
786 | /* max we can copy in one read is PAGE_SIZE */ | |
787 | if (aligned_length > ERR_BUFF_MAX_COPY_SIZE) { | |
788 | aligned_length = ERR_BUFF_MAX_COPY_SIZE; | |
789 | count = ERR_BUFF_MAX_COPY_SIZE - (off & 0x7); | |
790 | } | |
791 | ||
792 | /* use bounce buffer for copy */ | |
793 | tbuf = (void *)__get_free_page(GFP_TEMPORARY); | |
794 | if (!tbuf) | |
795 | return -ENOMEM; | |
796 | ||
797 | /* perform aligned read from the mmio region */ | |
798 | memcpy_fromio(tbuf, ebuf + aligned_start, aligned_length); | |
799 | memcpy(buf, tbuf + (off & 0x7), count); | |
800 | ||
801 | free_page((unsigned long)tbuf); | |
802 | ||
803 | return count; | |
804 | } | |
805 | ||
d76427b0 | 806 | static int cxl_configure_afu(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) |
f204e0b8 | 807 | { |
f204e0b8 IM |
808 | int rc; |
809 | ||
f204e0b8 | 810 | if ((rc = cxl_map_slice_regs(afu, adapter, dev))) |
d76427b0 | 811 | return rc; |
f204e0b8 IM |
812 | |
813 | if ((rc = sanitise_afu_regs(afu))) | |
d76427b0 | 814 | goto err1; |
f204e0b8 IM |
815 | |
816 | /* We need to reset the AFU before we can read the AFU descriptor */ | |
b12994fb | 817 | if ((rc = __cxl_afu_reset(afu))) |
d76427b0 | 818 | goto err1; |
f204e0b8 IM |
819 | |
820 | if (cxl_verbose) | |
821 | dump_afu_descriptor(afu); | |
822 | ||
823 | if ((rc = cxl_read_afu_descriptor(afu))) | |
d76427b0 | 824 | goto err1; |
f204e0b8 IM |
825 | |
826 | if ((rc = cxl_afu_descriptor_looks_ok(afu))) | |
d76427b0 | 827 | goto err1; |
f204e0b8 IM |
828 | |
829 | if ((rc = init_implementation_afu_regs(afu))) | |
d76427b0 | 830 | goto err1; |
f204e0b8 IM |
831 | |
832 | if ((rc = cxl_register_serr_irq(afu))) | |
d76427b0 | 833 | goto err1; |
f204e0b8 IM |
834 | |
835 | if ((rc = cxl_register_psl_irq(afu))) | |
d76427b0 DA |
836 | goto err2; |
837 | ||
838 | return 0; | |
839 | ||
840 | err2: | |
841 | cxl_release_serr_irq(afu); | |
842 | err1: | |
843 | cxl_unmap_slice_regs(afu); | |
844 | return rc; | |
845 | } | |
846 | ||
847 | static void cxl_deconfigure_afu(struct cxl_afu *afu) | |
848 | { | |
849 | cxl_release_psl_irq(afu); | |
850 | cxl_release_serr_irq(afu); | |
851 | cxl_unmap_slice_regs(afu); | |
852 | } | |
853 | ||
854 | static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) | |
855 | { | |
856 | struct cxl_afu *afu; | |
857 | int rc; | |
858 | ||
859 | afu = cxl_alloc_afu(adapter, slice); | |
860 | if (!afu) | |
861 | return -ENOMEM; | |
862 | ||
863 | rc = dev_set_name(&afu->dev, "afu%i.%i", adapter->adapter_num, slice); | |
864 | if (rc) | |
865 | goto err_free; | |
866 | ||
867 | rc = cxl_configure_afu(afu, adapter, dev); | |
868 | if (rc) | |
869 | goto err_free; | |
f204e0b8 IM |
870 | |
871 | /* Don't care if this fails */ | |
872 | cxl_debugfs_afu_add(afu); | |
873 | ||
874 | /* | |
875 | * After we call this function we must not free the afu directly, even | |
876 | * if it returns an error! | |
877 | */ | |
878 | if ((rc = cxl_register_afu(afu))) | |
879 | goto err_put1; | |
880 | ||
881 | if ((rc = cxl_sysfs_afu_add(afu))) | |
882 | goto err_put1; | |
883 | ||
f204e0b8 IM |
884 | adapter->afu[afu->slice] = afu; |
885 | ||
6f7f0b3d MN |
886 | if ((rc = cxl_pci_vphb_add(afu))) |
887 | dev_info(&afu->dev, "Can't register vPHB\n"); | |
888 | ||
f204e0b8 IM |
889 | return 0; |
890 | ||
f204e0b8 | 891 | err_put1: |
d76427b0 | 892 | cxl_deconfigure_afu(afu); |
f204e0b8 | 893 | cxl_debugfs_afu_remove(afu); |
d76427b0 | 894 | device_unregister(&afu->dev); |
f204e0b8 | 895 | return rc; |
d76427b0 DA |
896 | |
897 | err_free: | |
898 | kfree(afu); | |
899 | return rc; | |
900 | ||
f204e0b8 IM |
901 | } |
902 | ||
903 | static void cxl_remove_afu(struct cxl_afu *afu) | |
904 | { | |
905 | pr_devel("cxl_remove_afu\n"); | |
906 | ||
907 | if (!afu) | |
908 | return; | |
909 | ||
910 | cxl_sysfs_afu_remove(afu); | |
911 | cxl_debugfs_afu_remove(afu); | |
912 | ||
913 | spin_lock(&afu->adapter->afu_list_lock); | |
914 | afu->adapter->afu[afu->slice] = NULL; | |
915 | spin_unlock(&afu->adapter->afu_list_lock); | |
916 | ||
917 | cxl_context_detach_all(afu); | |
918 | cxl_afu_deactivate_mode(afu); | |
919 | ||
d76427b0 | 920 | cxl_deconfigure_afu(afu); |
f204e0b8 IM |
921 | device_unregister(&afu->dev); |
922 | } | |
923 | ||
62fa19d4 RG |
924 | int cxl_reset(struct cxl *adapter) |
925 | { | |
926 | struct pci_dev *dev = to_pci_dev(adapter->dev.parent); | |
927 | int rc; | |
62fa19d4 | 928 | |
13e68d8b DA |
929 | if (adapter->perst_same_image) { |
930 | dev_warn(&dev->dev, | |
931 | "cxl: refusing to reset/reflash when perst_reloads_same_image is set.\n"); | |
932 | return -EINVAL; | |
933 | } | |
934 | ||
62fa19d4 RG |
935 | dev_info(&dev->dev, "CXL reset\n"); |
936 | ||
62fa19d4 RG |
937 | /* pcie_warm_reset requests a fundamental pci reset which includes a |
938 | * PERST assert/deassert. PERST triggers a loading of the image | |
939 | * if "user" or "factory" is selected in sysfs */ | |
940 | if ((rc = pci_set_pcie_reset_state(dev, pcie_warm_reset))) { | |
941 | dev_err(&dev->dev, "cxl: pcie_warm_reset failed\n"); | |
942 | return rc; | |
943 | } | |
944 | ||
62fa19d4 RG |
945 | return rc; |
946 | } | |
f204e0b8 IM |
947 | |
948 | static int cxl_map_adapter_regs(struct cxl *adapter, struct pci_dev *dev) | |
949 | { | |
950 | if (pci_request_region(dev, 2, "priv 2 regs")) | |
951 | goto err1; | |
952 | if (pci_request_region(dev, 0, "priv 1 regs")) | |
953 | goto err2; | |
954 | ||
de369538 | 955 | pr_devel("cxl_map_adapter_regs: p1: %#016llx %#llx, p2: %#016llx %#llx", |
f204e0b8 IM |
956 | p1_base(dev), p1_size(dev), p2_base(dev), p2_size(dev)); |
957 | ||
958 | if (!(adapter->p1_mmio = ioremap(p1_base(dev), p1_size(dev)))) | |
959 | goto err3; | |
960 | ||
961 | if (!(adapter->p2_mmio = ioremap(p2_base(dev), p2_size(dev)))) | |
962 | goto err4; | |
963 | ||
964 | return 0; | |
965 | ||
966 | err4: | |
967 | iounmap(adapter->p1_mmio); | |
968 | adapter->p1_mmio = NULL; | |
969 | err3: | |
970 | pci_release_region(dev, 0); | |
971 | err2: | |
972 | pci_release_region(dev, 2); | |
973 | err1: | |
974 | return -ENOMEM; | |
975 | } | |
976 | ||
977 | static void cxl_unmap_adapter_regs(struct cxl *adapter) | |
978 | { | |
575e6986 | 979 | if (adapter->p1_mmio) { |
f204e0b8 | 980 | iounmap(adapter->p1_mmio); |
575e6986 DA |
981 | adapter->p1_mmio = NULL; |
982 | pci_release_region(to_pci_dev(adapter->dev.parent), 2); | |
983 | } | |
984 | if (adapter->p2_mmio) { | |
f204e0b8 | 985 | iounmap(adapter->p2_mmio); |
575e6986 DA |
986 | adapter->p2_mmio = NULL; |
987 | pci_release_region(to_pci_dev(adapter->dev.parent), 0); | |
988 | } | |
f204e0b8 IM |
989 | } |
990 | ||
991 | static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev) | |
992 | { | |
993 | int vsec; | |
994 | u32 afu_desc_off, afu_desc_size; | |
995 | u32 ps_off, ps_size; | |
996 | u16 vseclen; | |
997 | u8 image_state; | |
998 | ||
999 | if (!(vsec = find_cxl_vsec(dev))) { | |
bee30c70 | 1000 | dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); |
f204e0b8 IM |
1001 | return -ENODEV; |
1002 | } | |
1003 | ||
1004 | CXL_READ_VSEC_LENGTH(dev, vsec, &vseclen); | |
1005 | if (vseclen < CXL_VSEC_MIN_SIZE) { | |
bee30c70 | 1006 | dev_err(&dev->dev, "ABORTING: CXL VSEC too short\n"); |
f204e0b8 IM |
1007 | return -EINVAL; |
1008 | } | |
1009 | ||
1010 | CXL_READ_VSEC_STATUS(dev, vsec, &adapter->vsec_status); | |
1011 | CXL_READ_VSEC_PSL_REVISION(dev, vsec, &adapter->psl_rev); | |
1012 | CXL_READ_VSEC_CAIA_MAJOR(dev, vsec, &adapter->caia_major); | |
1013 | CXL_READ_VSEC_CAIA_MINOR(dev, vsec, &adapter->caia_minor); | |
1014 | CXL_READ_VSEC_BASE_IMAGE(dev, vsec, &adapter->base_image); | |
1015 | CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state); | |
1016 | adapter->user_image_loaded = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); | |
4beb5421 | 1017 | adapter->perst_select_user = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); |
f204e0b8 IM |
1018 | |
1019 | CXL_READ_VSEC_NAFUS(dev, vsec, &adapter->slices); | |
1020 | CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, &afu_desc_off); | |
1021 | CXL_READ_VSEC_AFU_DESC_SIZE(dev, vsec, &afu_desc_size); | |
1022 | CXL_READ_VSEC_PS_OFF(dev, vsec, &ps_off); | |
1023 | CXL_READ_VSEC_PS_SIZE(dev, vsec, &ps_size); | |
1024 | ||
1025 | /* Convert everything to bytes, because there is NO WAY I'd look at the | |
1026 | * code a month later and forget what units these are in ;-) */ | |
1027 | adapter->ps_off = ps_off * 64 * 1024; | |
1028 | adapter->ps_size = ps_size * 64 * 1024; | |
1029 | adapter->afu_desc_off = afu_desc_off * 64 * 1024; | |
1030 | adapter->afu_desc_size = afu_desc_size *64 * 1024; | |
1031 | ||
1032 | /* Total IRQs - 1 PSL ERROR - #AFU*(1 slice error + 1 DSI) */ | |
1033 | adapter->user_irqs = pnv_cxl_get_irq_count(dev) - 1 - 2*adapter->slices; | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static int cxl_vsec_looks_ok(struct cxl *adapter, struct pci_dev *dev) | |
1039 | { | |
1040 | if (adapter->vsec_status & CXL_STATUS_SECOND_PORT) | |
1041 | return -EBUSY; | |
1042 | ||
1043 | if (adapter->vsec_status & CXL_UNSUPPORTED_FEATURES) { | |
bee30c70 | 1044 | dev_err(&dev->dev, "ABORTING: CXL requires unsupported features\n"); |
f204e0b8 IM |
1045 | return -EINVAL; |
1046 | } | |
1047 | ||
1048 | if (!adapter->slices) { | |
1049 | /* Once we support dynamic reprogramming we can use the card if | |
1050 | * it supports loadable AFUs */ | |
bee30c70 | 1051 | dev_err(&dev->dev, "ABORTING: Device has no AFUs\n"); |
f204e0b8 IM |
1052 | return -EINVAL; |
1053 | } | |
1054 | ||
1055 | if (!adapter->afu_desc_off || !adapter->afu_desc_size) { | |
bee30c70 | 1056 | dev_err(&dev->dev, "ABORTING: VSEC shows no AFU descriptors\n"); |
f204e0b8 IM |
1057 | return -EINVAL; |
1058 | } | |
1059 | ||
1060 | if (adapter->ps_size > p2_size(dev) - adapter->ps_off) { | |
bee30c70 | 1061 | dev_err(&dev->dev, "ABORTING: Problem state size larger than " |
f204e0b8 IM |
1062 | "available in BAR2: 0x%llx > 0x%llx\n", |
1063 | adapter->ps_size, p2_size(dev) - adapter->ps_off); | |
1064 | return -EINVAL; | |
1065 | } | |
1066 | ||
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static void cxl_release_adapter(struct device *dev) | |
1071 | { | |
1072 | struct cxl *adapter = to_cxl_adapter(dev); | |
1073 | ||
1074 | pr_devel("cxl_release_adapter\n"); | |
1075 | ||
c044c415 DA |
1076 | cxl_remove_adapter_nr(adapter); |
1077 | ||
f204e0b8 IM |
1078 | kfree(adapter); |
1079 | } | |
1080 | ||
c044c415 | 1081 | static struct cxl *cxl_alloc_adapter(void) |
f204e0b8 IM |
1082 | { |
1083 | struct cxl *adapter; | |
1084 | ||
1085 | if (!(adapter = kzalloc(sizeof(struct cxl), GFP_KERNEL))) | |
1086 | return NULL; | |
1087 | ||
f204e0b8 IM |
1088 | spin_lock_init(&adapter->afu_list_lock); |
1089 | ||
c044c415 DA |
1090 | if (cxl_alloc_adapter_nr(adapter)) |
1091 | goto err1; | |
1092 | ||
1093 | if (dev_set_name(&adapter->dev, "card%i", adapter->adapter_num)) | |
1094 | goto err2; | |
1095 | ||
f204e0b8 | 1096 | return adapter; |
c044c415 DA |
1097 | |
1098 | err2: | |
1099 | cxl_remove_adapter_nr(adapter); | |
1100 | err1: | |
1101 | kfree(adapter); | |
1102 | return NULL; | |
f204e0b8 IM |
1103 | } |
1104 | ||
390fd592 PB |
1105 | #define CXL_PSL_ErrIVTE_tberror (0x1ull << (63-31)) |
1106 | ||
f204e0b8 IM |
1107 | static int sanitise_adapter_regs(struct cxl *adapter) |
1108 | { | |
390fd592 PB |
1109 | /* Clear PSL tberror bit by writing 1 to it */ |
1110 | cxl_p1_write(adapter, CXL_PSL_ErrIVTE, CXL_PSL_ErrIVTE_tberror); | |
f204e0b8 IM |
1111 | return cxl_tlb_slb_invalidate(adapter); |
1112 | } | |
1113 | ||
c044c415 DA |
1114 | /* This should contain *only* operations that can safely be done in |
1115 | * both creation and recovery. | |
1116 | */ | |
1117 | static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev) | |
f204e0b8 | 1118 | { |
f204e0b8 IM |
1119 | int rc; |
1120 | ||
c044c415 DA |
1121 | adapter->dev.parent = &dev->dev; |
1122 | adapter->dev.release = cxl_release_adapter; | |
1123 | pci_set_drvdata(dev, adapter); | |
f204e0b8 | 1124 | |
c044c415 DA |
1125 | rc = pci_enable_device(dev); |
1126 | if (rc) { | |
1127 | dev_err(&dev->dev, "pci_enable_device failed: %i\n", rc); | |
1128 | return rc; | |
1129 | } | |
f204e0b8 | 1130 | |
bee30c70 | 1131 | if ((rc = cxl_read_vsec(adapter, dev))) |
c044c415 | 1132 | return rc; |
bee30c70 IM |
1133 | |
1134 | if ((rc = cxl_vsec_looks_ok(adapter, dev))) | |
c044c415 | 1135 | return rc; |
bee30c70 IM |
1136 | |
1137 | if ((rc = setup_cxl_bars(dev))) | |
c044c415 | 1138 | return rc; |
bee30c70 | 1139 | |
f204e0b8 | 1140 | if ((rc = switch_card_to_cxl(dev))) |
c044c415 | 1141 | return rc; |
f204e0b8 | 1142 | |
4beb5421 | 1143 | if ((rc = cxl_update_image_control(adapter))) |
c044c415 | 1144 | return rc; |
4beb5421 | 1145 | |
f204e0b8 | 1146 | if ((rc = cxl_map_adapter_regs(adapter, dev))) |
c044c415 | 1147 | return rc; |
f204e0b8 IM |
1148 | |
1149 | if ((rc = sanitise_adapter_regs(adapter))) | |
c044c415 | 1150 | goto err; |
f204e0b8 IM |
1151 | |
1152 | if ((rc = init_implementation_adapter_regs(adapter, dev))) | |
c044c415 | 1153 | goto err; |
f204e0b8 | 1154 | |
1212aa1c | 1155 | if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_CAPI))) |
c044c415 | 1156 | goto err; |
f204e0b8 | 1157 | |
1212aa1c RG |
1158 | /* If recovery happened, the last step is to turn on snooping. |
1159 | * In the non-recovery case this has no effect */ | |
c044c415 DA |
1160 | if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_ON))) |
1161 | goto err; | |
1212aa1c | 1162 | |
390fd592 PB |
1163 | if ((rc = cxl_setup_psl_timebase(adapter, dev))) |
1164 | goto err; | |
1165 | ||
f204e0b8 | 1166 | if ((rc = cxl_register_psl_err_irq(adapter))) |
c044c415 DA |
1167 | goto err; |
1168 | ||
1169 | return 0; | |
1170 | ||
1171 | err: | |
1172 | cxl_unmap_adapter_regs(adapter); | |
1173 | return rc; | |
1174 | ||
1175 | } | |
1176 | ||
1177 | static void cxl_deconfigure_adapter(struct cxl *adapter) | |
1178 | { | |
1179 | struct pci_dev *pdev = to_pci_dev(adapter->dev.parent); | |
1180 | ||
1181 | cxl_release_psl_err_irq(adapter); | |
1182 | cxl_unmap_adapter_regs(adapter); | |
1183 | ||
1184 | pci_disable_device(pdev); | |
1185 | } | |
1186 | ||
1187 | static struct cxl *cxl_init_adapter(struct pci_dev *dev) | |
1188 | { | |
1189 | struct cxl *adapter; | |
1190 | int rc; | |
1191 | ||
1192 | adapter = cxl_alloc_adapter(); | |
1193 | if (!adapter) | |
1194 | return ERR_PTR(-ENOMEM); | |
1195 | ||
1196 | /* Set defaults for parameters which need to persist over | |
1197 | * configure/reconfigure | |
1198 | */ | |
1199 | adapter->perst_loads_image = true; | |
13e68d8b | 1200 | adapter->perst_same_image = false; |
c044c415 DA |
1201 | |
1202 | rc = cxl_configure_adapter(adapter, dev); | |
1203 | if (rc) { | |
1204 | pci_disable_device(dev); | |
1205 | cxl_release_adapter(&adapter->dev); | |
1206 | return ERR_PTR(rc); | |
1207 | } | |
f204e0b8 IM |
1208 | |
1209 | /* Don't care if this one fails: */ | |
1210 | cxl_debugfs_adapter_add(adapter); | |
1211 | ||
1212 | /* | |
1213 | * After we call this function we must not free the adapter directly, | |
1214 | * even if it returns an error! | |
1215 | */ | |
1216 | if ((rc = cxl_register_adapter(adapter))) | |
1217 | goto err_put1; | |
1218 | ||
1219 | if ((rc = cxl_sysfs_adapter_add(adapter))) | |
1220 | goto err_put1; | |
1221 | ||
1222 | return adapter; | |
1223 | ||
1224 | err_put1: | |
c044c415 DA |
1225 | /* This should mirror cxl_remove_adapter, except without the |
1226 | * sysfs parts | |
1227 | */ | |
f204e0b8 | 1228 | cxl_debugfs_adapter_remove(adapter); |
c044c415 DA |
1229 | cxl_deconfigure_adapter(adapter); |
1230 | device_unregister(&adapter->dev); | |
f204e0b8 IM |
1231 | return ERR_PTR(rc); |
1232 | } | |
1233 | ||
1234 | static void cxl_remove_adapter(struct cxl *adapter) | |
1235 | { | |
c044c415 | 1236 | pr_devel("cxl_remove_adapter\n"); |
f204e0b8 IM |
1237 | |
1238 | cxl_sysfs_adapter_remove(adapter); | |
1239 | cxl_debugfs_adapter_remove(adapter); | |
f204e0b8 | 1240 | |
c044c415 | 1241 | cxl_deconfigure_adapter(adapter); |
f204e0b8 | 1242 | |
c044c415 | 1243 | device_unregister(&adapter->dev); |
f204e0b8 IM |
1244 | } |
1245 | ||
1246 | static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
1247 | { | |
1248 | struct cxl *adapter; | |
1249 | int slice; | |
1250 | int rc; | |
1251 | ||
f204e0b8 IM |
1252 | if (cxl_verbose) |
1253 | dump_cxl_config_space(dev); | |
1254 | ||
f204e0b8 IM |
1255 | adapter = cxl_init_adapter(dev); |
1256 | if (IS_ERR(adapter)) { | |
1257 | dev_err(&dev->dev, "cxl_init_adapter failed: %li\n", PTR_ERR(adapter)); | |
1258 | return PTR_ERR(adapter); | |
1259 | } | |
1260 | ||
1261 | for (slice = 0; slice < adapter->slices; slice++) { | |
d76427b0 | 1262 | if ((rc = cxl_init_afu(adapter, slice, dev))) { |
f204e0b8 | 1263 | dev_err(&dev->dev, "AFU %i failed to initialise: %i\n", slice, rc); |
d76427b0 DA |
1264 | continue; |
1265 | } | |
1266 | ||
1267 | rc = cxl_afu_select_best_mode(adapter->afu[slice]); | |
1268 | if (rc) | |
1269 | dev_err(&dev->dev, "AFU %i failed to start: %i\n", slice, rc); | |
f204e0b8 IM |
1270 | } |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | static void cxl_remove(struct pci_dev *dev) | |
1276 | { | |
1277 | struct cxl *adapter = pci_get_drvdata(dev); | |
6f7f0b3d MN |
1278 | struct cxl_afu *afu; |
1279 | int i; | |
f204e0b8 | 1280 | |
f204e0b8 IM |
1281 | /* |
1282 | * Lock to prevent someone grabbing a ref through the adapter list as | |
1283 | * we are removing it | |
1284 | */ | |
6f7f0b3d MN |
1285 | for (i = 0; i < adapter->slices; i++) { |
1286 | afu = adapter->afu[i]; | |
1287 | cxl_pci_vphb_remove(afu); | |
1288 | cxl_remove_afu(afu); | |
1289 | } | |
f204e0b8 IM |
1290 | cxl_remove_adapter(adapter); |
1291 | } | |
1292 | ||
9e8df8a2 DA |
1293 | static pci_ers_result_t cxl_vphb_error_detected(struct cxl_afu *afu, |
1294 | pci_channel_state_t state) | |
1295 | { | |
1296 | struct pci_dev *afu_dev; | |
1297 | pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; | |
1298 | pci_ers_result_t afu_result = PCI_ERS_RESULT_NEED_RESET; | |
1299 | ||
1300 | /* There should only be one entry, but go through the list | |
1301 | * anyway | |
1302 | */ | |
1303 | list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { | |
1304 | if (!afu_dev->driver) | |
1305 | continue; | |
1306 | ||
1307 | afu_dev->error_state = state; | |
1308 | ||
1309 | if (afu_dev->driver->err_handler) | |
1310 | afu_result = afu_dev->driver->err_handler->error_detected(afu_dev, | |
1311 | state); | |
1312 | /* Disconnect trumps all, NONE trumps NEED_RESET */ | |
1313 | if (afu_result == PCI_ERS_RESULT_DISCONNECT) | |
1314 | result = PCI_ERS_RESULT_DISCONNECT; | |
1315 | else if ((afu_result == PCI_ERS_RESULT_NONE) && | |
1316 | (result == PCI_ERS_RESULT_NEED_RESET)) | |
1317 | result = PCI_ERS_RESULT_NONE; | |
1318 | } | |
1319 | return result; | |
1320 | } | |
1321 | ||
1322 | static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev, | |
1323 | pci_channel_state_t state) | |
1324 | { | |
1325 | struct cxl *adapter = pci_get_drvdata(pdev); | |
1326 | struct cxl_afu *afu; | |
1327 | pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; | |
1328 | int i; | |
1329 | ||
1330 | /* At this point, we could still have an interrupt pending. | |
1331 | * Let's try to get them out of the way before they do | |
1332 | * anything we don't like. | |
1333 | */ | |
1334 | schedule(); | |
1335 | ||
1336 | /* If we're permanently dead, give up. */ | |
1337 | if (state == pci_channel_io_perm_failure) { | |
1338 | /* Tell the AFU drivers; but we don't care what they | |
1339 | * say, we're going away. | |
1340 | */ | |
1341 | for (i = 0; i < adapter->slices; i++) { | |
1342 | afu = adapter->afu[i]; | |
1343 | cxl_vphb_error_detected(afu, state); | |
1344 | } | |
1345 | return PCI_ERS_RESULT_DISCONNECT; | |
1346 | } | |
1347 | ||
1348 | /* Are we reflashing? | |
1349 | * | |
1350 | * If we reflash, we could come back as something entirely | |
1351 | * different, including a non-CAPI card. As such, by default | |
1352 | * we don't participate in the process. We'll be unbound and | |
1353 | * the slot re-probed. (TODO: check EEH doesn't blindly rebind | |
1354 | * us!) | |
1355 | * | |
1356 | * However, this isn't the entire story: for reliablity | |
1357 | * reasons, we usually want to reflash the FPGA on PERST in | |
1358 | * order to get back to a more reliable known-good state. | |
1359 | * | |
1360 | * This causes us a bit of a problem: if we reflash we can't | |
1361 | * trust that we'll come back the same - we could have a new | |
1362 | * image and been PERSTed in order to load that | |
1363 | * image. However, most of the time we actually *will* come | |
1364 | * back the same - for example a regular EEH event. | |
1365 | * | |
1366 | * Therefore, we allow the user to assert that the image is | |
1367 | * indeed the same and that we should continue on into EEH | |
1368 | * anyway. | |
1369 | */ | |
1370 | if (adapter->perst_loads_image && !adapter->perst_same_image) { | |
1371 | /* TODO take the PHB out of CXL mode */ | |
1372 | dev_info(&pdev->dev, "reflashing, so opting out of EEH!\n"); | |
1373 | return PCI_ERS_RESULT_NONE; | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * At this point, we want to try to recover. We'll always | |
1378 | * need a complete slot reset: we don't trust any other reset. | |
1379 | * | |
1380 | * Now, we go through each AFU: | |
1381 | * - We send the driver, if bound, an error_detected callback. | |
1382 | * We expect it to clean up, but it can also tell us to give | |
1383 | * up and permanently detach the card. To simplify things, if | |
1384 | * any bound AFU driver doesn't support EEH, we give up on EEH. | |
1385 | * | |
1386 | * - We detach all contexts associated with the AFU. This | |
1387 | * does not free them, but puts them into a CLOSED state | |
1388 | * which causes any the associated files to return useful | |
1389 | * errors to userland. It also unmaps, but does not free, | |
1390 | * any IRQs. | |
1391 | * | |
1392 | * - We clean up our side: releasing and unmapping resources we hold | |
1393 | * so we can wire them up again when the hardware comes back up. | |
1394 | * | |
1395 | * Driver authors should note: | |
1396 | * | |
1397 | * - Any contexts you create in your kernel driver (except | |
1398 | * those associated with anonymous file descriptors) are | |
1399 | * your responsibility to free and recreate. Likewise with | |
1400 | * any attached resources. | |
1401 | * | |
1402 | * - We will take responsibility for re-initialising the | |
1403 | * device context (the one set up for you in | |
1404 | * cxl_pci_enable_device_hook and accessed through | |
1405 | * cxl_get_context). If you've attached IRQs or other | |
1406 | * resources to it, they remains yours to free. | |
1407 | * | |
1408 | * You can call the same functions to release resources as you | |
1409 | * normally would: we make sure that these functions continue | |
1410 | * to work when the hardware is down. | |
1411 | * | |
1412 | * Two examples: | |
1413 | * | |
1414 | * 1) If you normally free all your resources at the end of | |
1415 | * each request, or if you use anonymous FDs, your | |
1416 | * error_detected callback can simply set a flag to tell | |
1417 | * your driver not to start any new calls. You can then | |
1418 | * clear the flag in the resume callback. | |
1419 | * | |
1420 | * 2) If you normally allocate your resources on startup: | |
1421 | * * Set a flag in error_detected as above. | |
1422 | * * Let CXL detach your contexts. | |
1423 | * * In slot_reset, free the old resources and allocate new ones. | |
1424 | * * In resume, clear the flag to allow things to start. | |
1425 | */ | |
1426 | for (i = 0; i < adapter->slices; i++) { | |
1427 | afu = adapter->afu[i]; | |
1428 | ||
1429 | result = cxl_vphb_error_detected(afu, state); | |
1430 | ||
1431 | /* Only continue if everyone agrees on NEED_RESET */ | |
1432 | if (result != PCI_ERS_RESULT_NEED_RESET) | |
1433 | return result; | |
1434 | ||
1435 | cxl_context_detach_all(afu); | |
1436 | cxl_afu_deactivate_mode(afu); | |
1437 | cxl_deconfigure_afu(afu); | |
1438 | } | |
1439 | cxl_deconfigure_adapter(adapter); | |
1440 | ||
1441 | return result; | |
1442 | } | |
1443 | ||
1444 | static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev) | |
1445 | { | |
1446 | struct cxl *adapter = pci_get_drvdata(pdev); | |
1447 | struct cxl_afu *afu; | |
1448 | struct cxl_context *ctx; | |
1449 | struct pci_dev *afu_dev; | |
1450 | pci_ers_result_t afu_result = PCI_ERS_RESULT_RECOVERED; | |
1451 | pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED; | |
1452 | int i; | |
1453 | ||
1454 | if (cxl_configure_adapter(adapter, pdev)) | |
1455 | goto err; | |
1456 | ||
1457 | for (i = 0; i < adapter->slices; i++) { | |
1458 | afu = adapter->afu[i]; | |
1459 | ||
1460 | if (cxl_configure_afu(afu, adapter, pdev)) | |
1461 | goto err; | |
1462 | ||
1463 | if (cxl_afu_select_best_mode(afu)) | |
1464 | goto err; | |
1465 | ||
1466 | cxl_pci_vphb_reconfigure(afu); | |
1467 | ||
1468 | list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { | |
1469 | /* Reset the device context. | |
1470 | * TODO: make this less disruptive | |
1471 | */ | |
1472 | ctx = cxl_get_context(afu_dev); | |
1473 | ||
1474 | if (ctx && cxl_release_context(ctx)) | |
1475 | goto err; | |
1476 | ||
1477 | ctx = cxl_dev_context_init(afu_dev); | |
1478 | if (!ctx) | |
1479 | goto err; | |
1480 | ||
1481 | afu_dev->dev.archdata.cxl_ctx = ctx; | |
1482 | ||
1483 | if (cxl_afu_check_and_enable(afu)) | |
1484 | goto err; | |
1485 | ||
1486 | afu_dev->error_state = pci_channel_io_normal; | |
1487 | ||
1488 | /* If there's a driver attached, allow it to | |
1489 | * chime in on recovery. Drivers should check | |
1490 | * if everything has come back OK, but | |
1491 | * shouldn't start new work until we call | |
1492 | * their resume function. | |
1493 | */ | |
1494 | if (!afu_dev->driver) | |
1495 | continue; | |
1496 | ||
1497 | if (afu_dev->driver->err_handler && | |
1498 | afu_dev->driver->err_handler->slot_reset) | |
1499 | afu_result = afu_dev->driver->err_handler->slot_reset(afu_dev); | |
1500 | ||
1501 | if (afu_result == PCI_ERS_RESULT_DISCONNECT) | |
1502 | result = PCI_ERS_RESULT_DISCONNECT; | |
1503 | } | |
1504 | } | |
1505 | return result; | |
1506 | ||
1507 | err: | |
1508 | /* All the bits that happen in both error_detected and cxl_remove | |
1509 | * should be idempotent, so we don't need to worry about leaving a mix | |
1510 | * of unconfigured and reconfigured resources. | |
1511 | */ | |
1512 | dev_err(&pdev->dev, "EEH recovery failed. Asking to be disconnected.\n"); | |
1513 | return PCI_ERS_RESULT_DISCONNECT; | |
1514 | } | |
1515 | ||
1516 | static void cxl_pci_resume(struct pci_dev *pdev) | |
1517 | { | |
1518 | struct cxl *adapter = pci_get_drvdata(pdev); | |
1519 | struct cxl_afu *afu; | |
1520 | struct pci_dev *afu_dev; | |
1521 | int i; | |
1522 | ||
1523 | /* Everything is back now. Drivers should restart work now. | |
1524 | * This is not the place to be checking if everything came back up | |
1525 | * properly, because there's no return value: do that in slot_reset. | |
1526 | */ | |
1527 | for (i = 0; i < adapter->slices; i++) { | |
1528 | afu = adapter->afu[i]; | |
1529 | ||
1530 | list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { | |
1531 | if (afu_dev->driver && afu_dev->driver->err_handler && | |
1532 | afu_dev->driver->err_handler->resume) | |
1533 | afu_dev->driver->err_handler->resume(afu_dev); | |
1534 | } | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | static const struct pci_error_handlers cxl_err_handler = { | |
1539 | .error_detected = cxl_pci_error_detected, | |
1540 | .slot_reset = cxl_pci_slot_reset, | |
1541 | .resume = cxl_pci_resume, | |
1542 | }; | |
1543 | ||
f204e0b8 IM |
1544 | struct pci_driver cxl_pci_driver = { |
1545 | .name = "cxl-pci", | |
1546 | .id_table = cxl_pci_tbl, | |
1547 | .probe = cxl_probe, | |
1548 | .remove = cxl_remove, | |
aa70775e | 1549 | .shutdown = cxl_remove, |
9e8df8a2 | 1550 | .err_handler = &cxl_err_handler, |
f204e0b8 | 1551 | }; |