2 * Copyright 2014 IBM Corp.
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.
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>
19 #include <linux/delay.h>
21 #include <asm/msi_bitmap.h>
22 #include <asm/pnv-pci.h>
30 #define CXL_PCI_VSEC_ID 0x1280
31 #define CXL_VSEC_MIN_SIZE 0x80
33 #define CXL_READ_VSEC_LENGTH(dev, vsec, dest) \
35 pci_read_config_word(dev, vsec + 0x6, dest); \
38 #define CXL_READ_VSEC_NAFUS(dev, vsec, dest) \
39 pci_read_config_byte(dev, vsec + 0x8, dest)
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)
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_WRITE_VSEC_MODE_CONTROL_BUS(bus, devfn, vsec, val) \
59 pci_bus_write_config_byte(bus, devfn, vsec + 0xa, val)
60 #define CXL_VSEC_PROTOCOL_MASK 0xe0
61 #define CXL_VSEC_PROTOCOL_1024TB 0x80
62 #define CXL_VSEC_PROTOCOL_512TB 0x40
63 #define CXL_VSEC_PROTOCOL_256TB 0x20 /* Power 8/9 uses this */
64 #define CXL_VSEC_PROTOCOL_ENABLE 0x01
66 #define CXL_READ_VSEC_PSL_REVISION(dev, vsec, dest) \
67 pci_read_config_word(dev, vsec + 0xc, dest)
68 #define CXL_READ_VSEC_CAIA_MINOR(dev, vsec, dest) \
69 pci_read_config_byte(dev, vsec + 0xe, dest)
70 #define CXL_READ_VSEC_CAIA_MAJOR(dev, vsec, dest) \
71 pci_read_config_byte(dev, vsec + 0xf, dest)
72 #define CXL_READ_VSEC_BASE_IMAGE(dev, vsec, dest) \
73 pci_read_config_word(dev, vsec + 0x10, dest)
75 #define CXL_READ_VSEC_IMAGE_STATE(dev, vsec, dest) \
76 pci_read_config_byte(dev, vsec + 0x13, dest)
77 #define CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, val) \
78 pci_write_config_byte(dev, vsec + 0x13, val)
79 #define CXL_VSEC_USER_IMAGE_LOADED 0x80 /* RO */
80 #define CXL_VSEC_PERST_LOADS_IMAGE 0x20 /* RW */
81 #define CXL_VSEC_PERST_SELECT_USER 0x10 /* RW */
83 #define CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, dest) \
84 pci_read_config_dword(dev, vsec + 0x20, dest)
85 #define CXL_READ_VSEC_AFU_DESC_SIZE(dev, vsec, dest) \
86 pci_read_config_dword(dev, vsec + 0x24, dest)
87 #define CXL_READ_VSEC_PS_OFF(dev, vsec, dest) \
88 pci_read_config_dword(dev, vsec + 0x28, dest)
89 #define CXL_READ_VSEC_PS_SIZE(dev, vsec, dest) \
90 pci_read_config_dword(dev, vsec + 0x2c, dest)
93 /* This works a little different than the p1/p2 register accesses to make it
94 * easier to pull out individual fields */
95 #define AFUD_READ(afu, off) in_be64(afu->native->afu_desc_mmio + off)
96 #define AFUD_READ_LE(afu, off) in_le64(afu->native->afu_desc_mmio + off)
97 #define EXTRACT_PPC_BIT(val, bit) (!!(val & PPC_BIT(bit)))
98 #define EXTRACT_PPC_BITS(val, bs, be) ((val & PPC_BITMASK(bs, be)) >> PPC_BITLSHIFT(be))
100 #define AFUD_READ_INFO(afu) AFUD_READ(afu, 0x0)
101 #define AFUD_NUM_INTS_PER_PROC(val) EXTRACT_PPC_BITS(val, 0, 15)
102 #define AFUD_NUM_PROCS(val) EXTRACT_PPC_BITS(val, 16, 31)
103 #define AFUD_NUM_CRS(val) EXTRACT_PPC_BITS(val, 32, 47)
104 #define AFUD_MULTIMODE(val) EXTRACT_PPC_BIT(val, 48)
105 #define AFUD_PUSH_BLOCK_TRANSFER(val) EXTRACT_PPC_BIT(val, 55)
106 #define AFUD_DEDICATED_PROCESS(val) EXTRACT_PPC_BIT(val, 59)
107 #define AFUD_AFU_DIRECTED(val) EXTRACT_PPC_BIT(val, 61)
108 #define AFUD_TIME_SLICED(val) EXTRACT_PPC_BIT(val, 63)
109 #define AFUD_READ_CR(afu) AFUD_READ(afu, 0x20)
110 #define AFUD_CR_LEN(val) EXTRACT_PPC_BITS(val, 8, 63)
111 #define AFUD_READ_CR_OFF(afu) AFUD_READ(afu, 0x28)
112 #define AFUD_READ_PPPSA(afu) AFUD_READ(afu, 0x30)
113 #define AFUD_PPPSA_PP(val) EXTRACT_PPC_BIT(val, 6)
114 #define AFUD_PPPSA_PSA(val) EXTRACT_PPC_BIT(val, 7)
115 #define AFUD_PPPSA_LEN(val) EXTRACT_PPC_BITS(val, 8, 63)
116 #define AFUD_READ_PPPSA_OFF(afu) AFUD_READ(afu, 0x38)
117 #define AFUD_READ_EB(afu) AFUD_READ(afu, 0x40)
118 #define AFUD_EB_LEN(val) EXTRACT_PPC_BITS(val, 8, 63)
119 #define AFUD_READ_EB_OFF(afu) AFUD_READ(afu, 0x48)
121 static const struct pci_device_id cxl_pci_tbl
[] = {
122 { PCI_DEVICE(PCI_VENDOR_ID_IBM
, 0x0477), },
123 { PCI_DEVICE(PCI_VENDOR_ID_IBM
, 0x044b), },
124 { PCI_DEVICE(PCI_VENDOR_ID_IBM
, 0x04cf), },
125 { PCI_DEVICE(PCI_VENDOR_ID_IBM
, 0x0601), },
126 { PCI_DEVICE(PCI_VENDOR_ID_IBM
, 0x0623), },
127 { PCI_DEVICE(PCI_VENDOR_ID_IBM
, 0x0628), },
128 { PCI_DEVICE_CLASS(0x120000, ~0), },
132 MODULE_DEVICE_TABLE(pci
, cxl_pci_tbl
);
136 * Mostly using these wrappers to avoid confusion:
137 * priv 1 is BAR2, while priv 2 is BAR0
139 static inline resource_size_t
p1_base(struct pci_dev
*dev
)
141 return pci_resource_start(dev
, 2);
144 static inline resource_size_t
p1_size(struct pci_dev
*dev
)
146 return pci_resource_len(dev
, 2);
149 static inline resource_size_t
p2_base(struct pci_dev
*dev
)
151 return pci_resource_start(dev
, 0);
154 static inline resource_size_t
p2_size(struct pci_dev
*dev
)
156 return pci_resource_len(dev
, 0);
159 static int find_cxl_vsec(struct pci_dev
*dev
)
164 while ((vsec
= pci_find_next_ext_capability(dev
, vsec
, PCI_EXT_CAP_ID_VNDR
))) {
165 pci_read_config_word(dev
, vsec
+ 0x4, &val
);
166 if (val
== CXL_PCI_VSEC_ID
)
173 static void dump_cxl_config_space(struct pci_dev
*dev
)
178 dev_info(&dev
->dev
, "dump_cxl_config_space\n");
180 pci_read_config_dword(dev
, PCI_BASE_ADDRESS_0
, &val
);
181 dev_info(&dev
->dev
, "BAR0: %#.8x\n", val
);
182 pci_read_config_dword(dev
, PCI_BASE_ADDRESS_1
, &val
);
183 dev_info(&dev
->dev
, "BAR1: %#.8x\n", val
);
184 pci_read_config_dword(dev
, PCI_BASE_ADDRESS_2
, &val
);
185 dev_info(&dev
->dev
, "BAR2: %#.8x\n", val
);
186 pci_read_config_dword(dev
, PCI_BASE_ADDRESS_3
, &val
);
187 dev_info(&dev
->dev
, "BAR3: %#.8x\n", val
);
188 pci_read_config_dword(dev
, PCI_BASE_ADDRESS_4
, &val
);
189 dev_info(&dev
->dev
, "BAR4: %#.8x\n", val
);
190 pci_read_config_dword(dev
, PCI_BASE_ADDRESS_5
, &val
);
191 dev_info(&dev
->dev
, "BAR5: %#.8x\n", val
);
193 dev_info(&dev
->dev
, "p1 regs: %#llx, len: %#llx\n",
194 p1_base(dev
), p1_size(dev
));
195 dev_info(&dev
->dev
, "p2 regs: %#llx, len: %#llx\n",
196 p2_base(dev
), p2_size(dev
));
197 dev_info(&dev
->dev
, "BAR 4/5: %#llx, len: %#llx\n",
198 pci_resource_start(dev
, 4), pci_resource_len(dev
, 4));
200 if (!(vsec
= find_cxl_vsec(dev
)))
203 #define show_reg(name, what) \
204 dev_info(&dev->dev, "cxl vsec: %30s: %#x\n", name, what)
206 pci_read_config_dword(dev
, vsec
+ 0x0, &val
);
207 show_reg("Cap ID", (val
>> 0) & 0xffff);
208 show_reg("Cap Ver", (val
>> 16) & 0xf);
209 show_reg("Next Cap Ptr", (val
>> 20) & 0xfff);
210 pci_read_config_dword(dev
, vsec
+ 0x4, &val
);
211 show_reg("VSEC ID", (val
>> 0) & 0xffff);
212 show_reg("VSEC Rev", (val
>> 16) & 0xf);
213 show_reg("VSEC Length", (val
>> 20) & 0xfff);
214 pci_read_config_dword(dev
, vsec
+ 0x8, &val
);
215 show_reg("Num AFUs", (val
>> 0) & 0xff);
216 show_reg("Status", (val
>> 8) & 0xff);
217 show_reg("Mode Control", (val
>> 16) & 0xff);
218 show_reg("Reserved", (val
>> 24) & 0xff);
219 pci_read_config_dword(dev
, vsec
+ 0xc, &val
);
220 show_reg("PSL Rev", (val
>> 0) & 0xffff);
221 show_reg("CAIA Ver", (val
>> 16) & 0xffff);
222 pci_read_config_dword(dev
, vsec
+ 0x10, &val
);
223 show_reg("Base Image Rev", (val
>> 0) & 0xffff);
224 show_reg("Reserved", (val
>> 16) & 0x0fff);
225 show_reg("Image Control", (val
>> 28) & 0x3);
226 show_reg("Reserved", (val
>> 30) & 0x1);
227 show_reg("Image Loaded", (val
>> 31) & 0x1);
229 pci_read_config_dword(dev
, vsec
+ 0x14, &val
);
230 show_reg("Reserved", val
);
231 pci_read_config_dword(dev
, vsec
+ 0x18, &val
);
232 show_reg("Reserved", val
);
233 pci_read_config_dword(dev
, vsec
+ 0x1c, &val
);
234 show_reg("Reserved", val
);
236 pci_read_config_dword(dev
, vsec
+ 0x20, &val
);
237 show_reg("AFU Descriptor Offset", val
);
238 pci_read_config_dword(dev
, vsec
+ 0x24, &val
);
239 show_reg("AFU Descriptor Size", val
);
240 pci_read_config_dword(dev
, vsec
+ 0x28, &val
);
241 show_reg("Problem State Offset", val
);
242 pci_read_config_dword(dev
, vsec
+ 0x2c, &val
);
243 show_reg("Problem State Size", val
);
245 pci_read_config_dword(dev
, vsec
+ 0x30, &val
);
246 show_reg("Reserved", val
);
247 pci_read_config_dword(dev
, vsec
+ 0x34, &val
);
248 show_reg("Reserved", val
);
249 pci_read_config_dword(dev
, vsec
+ 0x38, &val
);
250 show_reg("Reserved", val
);
251 pci_read_config_dword(dev
, vsec
+ 0x3c, &val
);
252 show_reg("Reserved", val
);
254 pci_read_config_dword(dev
, vsec
+ 0x40, &val
);
255 show_reg("PSL Programming Port", val
);
256 pci_read_config_dword(dev
, vsec
+ 0x44, &val
);
257 show_reg("PSL Programming Control", val
);
259 pci_read_config_dword(dev
, vsec
+ 0x48, &val
);
260 show_reg("Reserved", val
);
261 pci_read_config_dword(dev
, vsec
+ 0x4c, &val
);
262 show_reg("Reserved", val
);
264 pci_read_config_dword(dev
, vsec
+ 0x50, &val
);
265 show_reg("Flash Address Register", val
);
266 pci_read_config_dword(dev
, vsec
+ 0x54, &val
);
267 show_reg("Flash Size Register", val
);
268 pci_read_config_dword(dev
, vsec
+ 0x58, &val
);
269 show_reg("Flash Status/Control Register", val
);
270 pci_read_config_dword(dev
, vsec
+ 0x58, &val
);
271 show_reg("Flash Data Port", val
);
276 static void dump_afu_descriptor(struct cxl_afu
*afu
)
278 u64 val
, afu_cr_num
, afu_cr_off
, afu_cr_len
;
281 #define show_reg(name, what) \
282 dev_info(&afu->dev, "afu desc: %30s: %#llx\n", name, what)
284 val
= AFUD_READ_INFO(afu
);
285 show_reg("num_ints_per_process", AFUD_NUM_INTS_PER_PROC(val
));
286 show_reg("num_of_processes", AFUD_NUM_PROCS(val
));
287 show_reg("num_of_afu_CRs", AFUD_NUM_CRS(val
));
288 show_reg("req_prog_mode", val
& 0xffffULL
);
289 afu_cr_num
= AFUD_NUM_CRS(val
);
291 val
= AFUD_READ(afu
, 0x8);
292 show_reg("Reserved", val
);
293 val
= AFUD_READ(afu
, 0x10);
294 show_reg("Reserved", val
);
295 val
= AFUD_READ(afu
, 0x18);
296 show_reg("Reserved", val
);
298 val
= AFUD_READ_CR(afu
);
299 show_reg("Reserved", (val
>> (63-7)) & 0xff);
300 show_reg("AFU_CR_len", AFUD_CR_LEN(val
));
301 afu_cr_len
= AFUD_CR_LEN(val
) * 256;
303 val
= AFUD_READ_CR_OFF(afu
);
305 show_reg("AFU_CR_offset", val
);
307 val
= AFUD_READ_PPPSA(afu
);
308 show_reg("PerProcessPSA_control", (val
>> (63-7)) & 0xff);
309 show_reg("PerProcessPSA Length", AFUD_PPPSA_LEN(val
));
311 val
= AFUD_READ_PPPSA_OFF(afu
);
312 show_reg("PerProcessPSA_offset", val
);
314 val
= AFUD_READ_EB(afu
);
315 show_reg("Reserved", (val
>> (63-7)) & 0xff);
316 show_reg("AFU_EB_len", AFUD_EB_LEN(val
));
318 val
= AFUD_READ_EB_OFF(afu
);
319 show_reg("AFU_EB_offset", val
);
321 for (i
= 0; i
< afu_cr_num
; i
++) {
322 val
= AFUD_READ_LE(afu
, afu_cr_off
+ i
* afu_cr_len
);
323 show_reg("CR Vendor", val
& 0xffff);
324 show_reg("CR Device", (val
>> 16) & 0xffff);
329 #define P8_CAPP_UNIT0_ID 0xBA
330 #define P8_CAPP_UNIT1_ID 0XBE
331 #define P9_CAPP_UNIT0_ID 0xC0
332 #define P9_CAPP_UNIT1_ID 0xE0
334 static int get_phb_index(struct device_node
*np
, u32
*phb_index
)
336 if (of_property_read_u32(np
, "ibm,phb-index", phb_index
))
341 static u64
get_capp_unit_id(struct device_node
*np
, u32 phb_index
)
345 * - For chips other than POWER8NVL, we only have CAPP 0,
346 * irrespective of which PHB is used.
347 * - For POWER8NVL, assume CAPP 0 is attached to PHB0 and
348 * CAPP 1 is attached to PHB1.
350 if (cxl_is_power8()) {
351 if (!pvr_version_is(PVR_POWER8NVL
))
352 return P8_CAPP_UNIT0_ID
;
355 return P8_CAPP_UNIT0_ID
;
358 return P8_CAPP_UNIT1_ID
;
363 * PEC0 (PHB0). Capp ID = CAPP0 (0b1100_0000)
364 * PEC1 (PHB1 - PHB2). No capi mode
365 * PEC2 (PHB3 - PHB4 - PHB5): Capi mode on PHB3 only. Capp ID = CAPP1 (0b1110_0000)
367 if (cxl_is_power9()) {
369 return P9_CAPP_UNIT0_ID
;
372 return P9_CAPP_UNIT1_ID
;
378 int cxl_calc_capp_routing(struct pci_dev
*dev
, u64
*chipid
,
379 u32
*phb_index
, u64
*capp_unit_id
)
382 struct device_node
*np
;
385 if (!(np
= pnv_pci_get_phb_node(dev
)))
388 while (np
&& !(prop
= of_get_property(np
, "ibm,chip-id", NULL
)))
389 np
= of_get_next_parent(np
);
393 *chipid
= be32_to_cpup(prop
);
395 rc
= get_phb_index(np
, phb_index
);
397 pr_err("cxl: invalid phb index\n");
401 *capp_unit_id
= get_capp_unit_id(np
, *phb_index
);
403 if (!*capp_unit_id
) {
404 pr_err("cxl: invalid capp unit id (phb_index: %d)\n",
412 int cxl_get_xsl9_dsnctl(u64 capp_unit_id
, u64
*reg
)
417 * CAPI Identifier bits [0:7]
418 * bit 61:60 MSI bits --> 0
419 * bit 59 TVT selector --> 0
423 * Tell XSL where to route data to.
424 * The field chipid should match the PHB CAPI_CMPM register
426 xsl_dsnctl
= ((u64
)0x2 << (63-7)); /* Bit 57 */
427 xsl_dsnctl
|= (capp_unit_id
<< (63-15));
429 /* nMMU_ID Defaults to: b’000001001’*/
430 xsl_dsnctl
|= ((u64
)0x09 << (63-28));
432 if (!(cxl_is_power9_dd1())) {
434 * Used to identify CAPI packets which should be sorted into
435 * the Non-Blocking queues by the PHB. This field should match
436 * the PHB PBL_NBW_CMPM register
437 * nbwind=0x03, bits [57:58], must include capi indicator.
438 * Not supported on P9 DD1.
440 xsl_dsnctl
|= ((u64
)0x03 << (63-47));
443 * Upper 16b address bits of ASB_Notify messages sent to the
444 * system. Need to match the PHB’s ASN Compare/Mask Register.
445 * Not supported on P9 DD1.
447 xsl_dsnctl
|= ((u64
)0x04 << (63-55));
454 static int init_implementation_adapter_regs_psl9(struct cxl
*adapter
,
457 u64 xsl_dsnctl
, psl_fircntl
;
463 rc
= cxl_calc_capp_routing(dev
, &chipid
, &phb_index
, &capp_unit_id
);
467 rc
= cxl_get_xsl9_dsnctl(capp_unit_id
, &xsl_dsnctl
);
471 cxl_p1_write(adapter
, CXL_XSL9_DSNCTL
, xsl_dsnctl
);
473 /* Set fir_cntl to recommended value for production env */
474 psl_fircntl
= (0x2ULL
<< (63-3)); /* ce_report */
475 psl_fircntl
|= (0x1ULL
<< (63-6)); /* FIR_report */
476 psl_fircntl
|= 0x1ULL
; /* ce_thresh */
477 cxl_p1_write(adapter
, CXL_PSL9_FIR_CNTL
, psl_fircntl
);
479 /* Setup the PSL to transmit packets on the PCIe before the
482 cxl_p1_write(adapter
, CXL_PSL9_DSNDCTL
, 0x0001001000002A10ULL
);
485 * A response to an ASB_Notify request is returned by the
486 * system as an MMIO write to the address defined in
487 * the PSL_TNR_ADDR register.
488 * keep the Reset Value: 0x00020000E0000000
491 /* Enable XSL rty limit */
492 cxl_p1_write(adapter
, CXL_XSL9_DEF
, 0x51F8000000000005ULL
);
494 /* Change XSL_INV dummy read threshold */
495 cxl_p1_write(adapter
, CXL_XSL9_INV
, 0x0000040007FFC200ULL
);
497 if (phb_index
== 3) {
498 /* disable machines 31-47 and 20-27 for DMA */
499 cxl_p1_write(adapter
, CXL_PSL9_APCDEDTYPE
, 0x40000FF3FFFF0000ULL
);
503 cxl_p1_write(adapter
, CXL_PSL9_APCDEDALLOC
, 0x800F000200000000ULL
);
505 if (cxl_is_power9_dd1()) {
506 /* Disabling deadlock counter CAR */
507 cxl_p1_write(adapter
, CXL_PSL9_GP_CT
, 0x0020000000000001ULL
);
509 cxl_p1_write(adapter
, CXL_PSL9_DEBUG
, 0x4000000000000000ULL
);
514 static int init_implementation_adapter_regs_psl8(struct cxl
*adapter
, struct pci_dev
*dev
)
516 u64 psl_dsnctl
, psl_fircntl
;
522 rc
= cxl_calc_capp_routing(dev
, &chipid
, &phb_index
, &capp_unit_id
);
526 psl_dsnctl
= 0x0000900000000000ULL
; /* pteupd ttype, scdone */
527 psl_dsnctl
|= (0x2ULL
<< (63-38)); /* MMIO hang pulse: 256 us */
528 /* Tell PSL where to route data to */
529 psl_dsnctl
|= (chipid
<< (63-5));
530 psl_dsnctl
|= (capp_unit_id
<< (63-13));
532 cxl_p1_write(adapter
, CXL_PSL_DSNDCTL
, psl_dsnctl
);
533 cxl_p1_write(adapter
, CXL_PSL_RESLCKTO
, 0x20000000200ULL
);
534 /* snoop write mask */
535 cxl_p1_write(adapter
, CXL_PSL_SNWRALLOC
, 0x00000000FFFFFFFFULL
);
536 /* set fir_cntl to recommended value for production env */
537 psl_fircntl
= (0x2ULL
<< (63-3)); /* ce_report */
538 psl_fircntl
|= (0x1ULL
<< (63-6)); /* FIR_report */
539 psl_fircntl
|= 0x1ULL
; /* ce_thresh */
540 cxl_p1_write(adapter
, CXL_PSL_FIR_CNTL
, psl_fircntl
);
541 /* for debugging with trace arrays */
542 cxl_p1_write(adapter
, CXL_PSL_TRACE
, 0x0000FF7C00000000ULL
);
547 static int init_implementation_adapter_regs_xsl(struct cxl
*adapter
, struct pci_dev
*dev
)
555 rc
= cxl_calc_capp_routing(dev
, &chipid
, &phb_index
, &capp_unit_id
);
559 /* Tell XSL where to route data to */
560 xsl_dsnctl
= 0x0000600000000000ULL
| (chipid
<< (63-5));
561 xsl_dsnctl
|= (capp_unit_id
<< (63-13));
562 cxl_p1_write(adapter
, CXL_XSL_DSNCTL
, xsl_dsnctl
);
568 #define TBSYNC_CAL(n) (((u64)n & 0x7) << (63-3))
569 #define TBSYNC_CNT(n) (((u64)n & 0x7) << (63-6))
570 /* For the PSL this is a multiple for 0 < n <= 7: */
571 #define PSL_2048_250MHZ_CYCLES 1
573 static void write_timebase_ctrl_psl9(struct cxl
*adapter
)
575 cxl_p1_write(adapter
, CXL_PSL9_TB_CTLSTAT
,
576 TBSYNC_CNT(2 * PSL_2048_250MHZ_CYCLES
));
579 static void write_timebase_ctrl_psl8(struct cxl
*adapter
)
581 cxl_p1_write(adapter
, CXL_PSL_TB_CTLSTAT
,
582 TBSYNC_CNT(2 * PSL_2048_250MHZ_CYCLES
));
586 #define TBSYNC_ENA (1ULL << 63)
587 /* For the XSL this is 2**n * 2000 clocks for 0 < n <= 6: */
588 #define XSL_2000_CLOCKS 1
589 #define XSL_4000_CLOCKS 2
590 #define XSL_8000_CLOCKS 3
592 static void write_timebase_ctrl_xsl(struct cxl
*adapter
)
594 cxl_p1_write(adapter
, CXL_XSL_TB_CTLSTAT
,
597 TBSYNC_CNT(XSL_4000_CLOCKS
));
600 static u64
timebase_read_psl9(struct cxl
*adapter
)
602 return cxl_p1_read(adapter
, CXL_PSL9_Timebase
);
605 static u64
timebase_read_psl8(struct cxl
*adapter
)
607 return cxl_p1_read(adapter
, CXL_PSL_Timebase
);
610 static u64
timebase_read_xsl(struct cxl
*adapter
)
612 return cxl_p1_read(adapter
, CXL_XSL_Timebase
);
615 static void cxl_setup_psl_timebase(struct cxl
*adapter
, struct pci_dev
*dev
)
619 unsigned int retry
= 0;
620 struct device_node
*np
;
622 adapter
->psl_timebase_synced
= false;
624 if (!(np
= pnv_pci_get_phb_node(dev
)))
627 /* Do not fail when CAPP timebase sync is not supported by OPAL */
629 if (! of_get_property(np
, "ibm,capp-timebase-sync", NULL
)) {
631 dev_info(&dev
->dev
, "PSL timebase inactive: OPAL support missing\n");
637 * Setup PSL Timebase Control and Status register
638 * with the recommended Timebase Sync Count value
640 adapter
->native
->sl_ops
->write_timebase_ctrl(adapter
);
642 /* Enable PSL Timebase */
643 cxl_p1_write(adapter
, CXL_PSL_Control
, 0x0000000000000000);
644 cxl_p1_write(adapter
, CXL_PSL_Control
, CXL_PSL_Control_tb
);
646 /* Wait until CORE TB and PSL TB difference <= 16usecs */
650 dev_info(&dev
->dev
, "PSL timebase can't synchronize\n");
653 psl_tb
= adapter
->native
->sl_ops
->timebase_read(adapter
);
654 delta
= mftb() - psl_tb
;
657 } while (tb_to_ns(delta
) > 16000);
659 adapter
->psl_timebase_synced
= true;
663 static int init_implementation_afu_regs_psl9(struct cxl_afu
*afu
)
668 static int init_implementation_afu_regs_psl8(struct cxl_afu
*afu
)
670 /* read/write masks for this slice */
671 cxl_p1n_write(afu
, CXL_PSL_APCALLOC_A
, 0xFFFFFFFEFEFEFEFEULL
);
672 /* APC read/write masks for this slice */
673 cxl_p1n_write(afu
, CXL_PSL_COALLOC_A
, 0xFF000000FEFEFEFEULL
);
674 /* for debugging with trace arrays */
675 cxl_p1n_write(afu
, CXL_PSL_SLICE_TRACE
, 0x0000FFFF00000000ULL
);
676 cxl_p1n_write(afu
, CXL_PSL_RXCTL_A
, CXL_PSL_RXCTL_AFUHP_4S
);
681 int cxl_pci_setup_irq(struct cxl
*adapter
, unsigned int hwirq
,
684 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
686 return pnv_cxl_ioda_msi_setup(dev
, hwirq
, virq
);
689 int cxl_update_image_control(struct cxl
*adapter
)
691 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
696 if (!(vsec
= find_cxl_vsec(dev
))) {
697 dev_err(&dev
->dev
, "ABORTING: CXL VSEC not found!\n");
701 if ((rc
= CXL_READ_VSEC_IMAGE_STATE(dev
, vsec
, &image_state
))) {
702 dev_err(&dev
->dev
, "failed to read image state: %i\n", rc
);
706 if (adapter
->perst_loads_image
)
707 image_state
|= CXL_VSEC_PERST_LOADS_IMAGE
;
709 image_state
&= ~CXL_VSEC_PERST_LOADS_IMAGE
;
711 if (adapter
->perst_select_user
)
712 image_state
|= CXL_VSEC_PERST_SELECT_USER
;
714 image_state
&= ~CXL_VSEC_PERST_SELECT_USER
;
716 if ((rc
= CXL_WRITE_VSEC_IMAGE_STATE(dev
, vsec
, image_state
))) {
717 dev_err(&dev
->dev
, "failed to update image control: %i\n", rc
);
724 int cxl_pci_alloc_one_irq(struct cxl
*adapter
)
726 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
728 return pnv_cxl_alloc_hwirqs(dev
, 1);
731 void cxl_pci_release_one_irq(struct cxl
*adapter
, int hwirq
)
733 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
735 return pnv_cxl_release_hwirqs(dev
, hwirq
, 1);
738 int cxl_pci_alloc_irq_ranges(struct cxl_irq_ranges
*irqs
,
739 struct cxl
*adapter
, unsigned int num
)
741 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
743 return pnv_cxl_alloc_hwirq_ranges(irqs
, dev
, num
);
746 void cxl_pci_release_irq_ranges(struct cxl_irq_ranges
*irqs
,
749 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
751 pnv_cxl_release_hwirq_ranges(irqs
, dev
);
754 static int setup_cxl_bars(struct pci_dev
*dev
)
756 /* Safety check in case we get backported to < 3.17 without M64 */
757 if ((p1_base(dev
) < 0x100000000ULL
) ||
758 (p2_base(dev
) < 0x100000000ULL
)) {
759 dev_err(&dev
->dev
, "ABORTING: M32 BAR assignment incompatible with CXL\n");
764 * BAR 4/5 has a special meaning for CXL and must be programmed with a
765 * special value corresponding to the CXL protocol address range.
766 * For POWER 8/9 that means bits 48:49 must be set to 10
768 pci_write_config_dword(dev
, PCI_BASE_ADDRESS_4
, 0x00000000);
769 pci_write_config_dword(dev
, PCI_BASE_ADDRESS_5
, 0x00020000);
774 #ifdef CONFIG_CXL_BIMODAL
776 struct cxl_switch_work
{
778 struct work_struct work
;
783 static void switch_card_to_cxl(struct work_struct
*work
)
785 struct cxl_switch_work
*switch_work
=
786 container_of(work
, struct cxl_switch_work
, work
);
787 struct pci_dev
*dev
= switch_work
->dev
;
788 struct pci_bus
*bus
= dev
->bus
;
789 struct pci_controller
*hose
= pci_bus_to_host(bus
);
790 struct pci_dev
*bridge
;
791 struct pnv_php_slot
*php_slot
;
796 dev_info(&bus
->dev
, "cxl: Preparing for mode switch...\n");
797 bridge
= list_first_entry_or_null(&hose
->bus
->devices
, struct pci_dev
,
800 dev_WARN(&bus
->dev
, "cxl: Couldn't find root port!\n");
804 php_slot
= pnv_php_find_slot(pci_device_to_OF_node(bridge
));
806 dev_err(&bus
->dev
, "cxl: Failed to find slot hotplug "
807 "information. You may need to upgrade "
808 "skiboot. Aborting.\n");
812 rc
= CXL_READ_VSEC_MODE_CONTROL(dev
, switch_work
->vsec
, &val
);
814 dev_err(&bus
->dev
, "cxl: Failed to read CAPI mode control: %i\n", rc
);
819 /* Release the reference obtained in cxl_check_and_switch_mode() */
822 dev_dbg(&bus
->dev
, "cxl: Removing PCI devices from kernel\n");
823 pci_lock_rescan_remove();
824 pci_hp_remove_devices(bridge
->subordinate
);
825 pci_unlock_rescan_remove();
827 /* Switch the CXL protocol on the card */
828 if (switch_work
->mode
== CXL_BIMODE_CXL
) {
829 dev_info(&bus
->dev
, "cxl: Switching card to CXL mode\n");
830 val
&= ~CXL_VSEC_PROTOCOL_MASK
;
831 val
|= CXL_VSEC_PROTOCOL_256TB
| CXL_VSEC_PROTOCOL_ENABLE
;
832 rc
= pnv_cxl_enable_phb_kernel_api(hose
, true);
834 dev_err(&bus
->dev
, "cxl: Failed to enable kernel API"
835 " on real PHB, aborting\n");
839 dev_WARN(&bus
->dev
, "cxl: Switching card to PCI mode not supported!\n");
843 rc
= CXL_WRITE_VSEC_MODE_CONTROL_BUS(bus
, devfn
, switch_work
->vsec
, val
);
845 dev_err(&bus
->dev
, "cxl: Failed to configure CXL protocol: %i\n", rc
);
850 * The CAIA spec (v1.1, Section 10.6 Bi-modal Device Support) states
851 * we must wait 100ms after this mode switch before touching PCIe config
857 * Hot reset to cause the card to come back in cxl mode. A
858 * OPAL_RESET_PCI_LINK would be sufficient, but currently lacks support
859 * in skiboot, so we use a hot reset instead.
861 * We call pci_set_pcie_reset_state() on the bridge, as a CAPI card is
862 * guaranteed to sit directly under the root port, and setting the reset
863 * state on a device directly under the root port is equivalent to doing
864 * it on the root port iself.
866 dev_info(&bus
->dev
, "cxl: Configuration write complete, resetting card\n");
867 pci_set_pcie_reset_state(bridge
, pcie_hot_reset
);
868 pci_set_pcie_reset_state(bridge
, pcie_deassert_reset
);
870 dev_dbg(&bus
->dev
, "cxl: Offlining slot\n");
871 rc
= pnv_php_set_slot_power_state(&php_slot
->slot
, OPAL_PCI_SLOT_OFFLINE
);
873 dev_err(&bus
->dev
, "cxl: OPAL offlining call failed: %i\n", rc
);
877 dev_dbg(&bus
->dev
, "cxl: Onlining and probing slot\n");
878 rc
= pnv_php_set_slot_power_state(&php_slot
->slot
, OPAL_PCI_SLOT_ONLINE
);
880 dev_err(&bus
->dev
, "cxl: OPAL onlining call failed: %i\n", rc
);
884 pci_lock_rescan_remove();
885 pci_hp_add_devices(bridge
->subordinate
);
886 pci_unlock_rescan_remove();
888 dev_info(&bus
->dev
, "cxl: CAPI mode switch completed\n");
893 /* Release the reference obtained in cxl_check_and_switch_mode() */
899 int cxl_check_and_switch_mode(struct pci_dev
*dev
, int mode
, int vsec
)
901 struct cxl_switch_work
*work
;
905 if (!cpu_has_feature(CPU_FTR_HVMODE
))
909 vsec
= find_cxl_vsec(dev
);
911 dev_info(&dev
->dev
, "CXL VSEC not found\n");
916 rc
= CXL_READ_VSEC_MODE_CONTROL(dev
, vsec
, &val
);
918 dev_err(&dev
->dev
, "Failed to read current mode control: %i", rc
);
922 if (mode
== CXL_BIMODE_PCI
) {
923 if (!(val
& CXL_VSEC_PROTOCOL_ENABLE
)) {
924 dev_info(&dev
->dev
, "Card is already in PCI mode\n");
928 * TODO: Before it's safe to switch the card back to PCI mode
929 * we need to disable the CAPP and make sure any cachelines the
930 * card holds have been flushed out. Needs skiboot support.
932 dev_WARN(&dev
->dev
, "CXL mode switch to PCI unsupported!\n");
936 if (val
& CXL_VSEC_PROTOCOL_ENABLE
) {
937 dev_info(&dev
->dev
, "Card is already in CXL mode\n");
941 dev_info(&dev
->dev
, "Card is in PCI mode, scheduling kernel thread "
942 "to switch to CXL mode\n");
944 work
= kmalloc(sizeof(struct cxl_switch_work
), GFP_KERNEL
);
952 INIT_WORK(&work
->work
, switch_card_to_cxl
);
954 schedule_work(&work
->work
);
957 * We return a failure now to abort the driver init. Once the
958 * link has been cycled and the card is in cxl mode we will
959 * come back (possibly using the generic cxl driver), but
960 * return success as the card should then be in cxl mode.
962 * TODO: What if the card comes back in PCI mode even after
963 * the switch? Don't want to spin endlessly.
967 EXPORT_SYMBOL_GPL(cxl_check_and_switch_mode
);
969 #endif /* CONFIG_CXL_BIMODAL */
971 static int setup_cxl_protocol_area(struct pci_dev
*dev
)
975 int vsec
= find_cxl_vsec(dev
);
978 dev_info(&dev
->dev
, "CXL VSEC not found\n");
982 rc
= CXL_READ_VSEC_MODE_CONTROL(dev
, vsec
, &val
);
984 dev_err(&dev
->dev
, "Failed to read current mode control: %i\n", rc
);
988 if (!(val
& CXL_VSEC_PROTOCOL_ENABLE
)) {
989 dev_err(&dev
->dev
, "Card not in CAPI mode!\n");
993 if ((val
& CXL_VSEC_PROTOCOL_MASK
) != CXL_VSEC_PROTOCOL_256TB
) {
994 val
&= ~CXL_VSEC_PROTOCOL_MASK
;
995 val
|= CXL_VSEC_PROTOCOL_256TB
;
996 rc
= CXL_WRITE_VSEC_MODE_CONTROL(dev
, vsec
, val
);
998 dev_err(&dev
->dev
, "Failed to set CXL protocol area: %i\n", rc
);
1006 static int pci_map_slice_regs(struct cxl_afu
*afu
, struct cxl
*adapter
, struct pci_dev
*dev
)
1008 u64 p1n_base
, p2n_base
, afu_desc
;
1009 const u64 p1n_size
= 0x100;
1010 const u64 p2n_size
= 0x1000;
1012 p1n_base
= p1_base(dev
) + 0x10000 + (afu
->slice
* p1n_size
);
1013 p2n_base
= p2_base(dev
) + (afu
->slice
* p2n_size
);
1014 afu
->psn_phys
= p2_base(dev
) + (adapter
->native
->ps_off
+ (afu
->slice
* adapter
->ps_size
));
1015 afu_desc
= p2_base(dev
) + adapter
->native
->afu_desc_off
+ (afu
->slice
* adapter
->native
->afu_desc_size
);
1017 if (!(afu
->native
->p1n_mmio
= ioremap(p1n_base
, p1n_size
)))
1019 if (!(afu
->p2n_mmio
= ioremap(p2n_base
, p2n_size
)))
1022 if (!(afu
->native
->afu_desc_mmio
= ioremap(afu_desc
, adapter
->native
->afu_desc_size
)))
1028 iounmap(afu
->p2n_mmio
);
1030 iounmap(afu
->native
->p1n_mmio
);
1032 dev_err(&afu
->dev
, "Error mapping AFU MMIO regions\n");
1036 static void pci_unmap_slice_regs(struct cxl_afu
*afu
)
1038 if (afu
->p2n_mmio
) {
1039 iounmap(afu
->p2n_mmio
);
1040 afu
->p2n_mmio
= NULL
;
1042 if (afu
->native
->p1n_mmio
) {
1043 iounmap(afu
->native
->p1n_mmio
);
1044 afu
->native
->p1n_mmio
= NULL
;
1046 if (afu
->native
->afu_desc_mmio
) {
1047 iounmap(afu
->native
->afu_desc_mmio
);
1048 afu
->native
->afu_desc_mmio
= NULL
;
1052 void cxl_pci_release_afu(struct device
*dev
)
1054 struct cxl_afu
*afu
= to_cxl_afu(dev
);
1056 pr_devel("%s\n", __func__
);
1058 idr_destroy(&afu
->contexts_idr
);
1059 cxl_release_spa(afu
);
1065 /* Expects AFU struct to have recently been zeroed out */
1066 static int cxl_read_afu_descriptor(struct cxl_afu
*afu
)
1070 val
= AFUD_READ_INFO(afu
);
1071 afu
->pp_irqs
= AFUD_NUM_INTS_PER_PROC(val
);
1072 afu
->max_procs_virtualised
= AFUD_NUM_PROCS(val
);
1073 afu
->crs_num
= AFUD_NUM_CRS(val
);
1075 if (AFUD_AFU_DIRECTED(val
))
1076 afu
->modes_supported
|= CXL_MODE_DIRECTED
;
1077 if (AFUD_DEDICATED_PROCESS(val
))
1078 afu
->modes_supported
|= CXL_MODE_DEDICATED
;
1079 if (AFUD_TIME_SLICED(val
))
1080 afu
->modes_supported
|= CXL_MODE_TIME_SLICED
;
1082 val
= AFUD_READ_PPPSA(afu
);
1083 afu
->pp_size
= AFUD_PPPSA_LEN(val
) * 4096;
1084 afu
->psa
= AFUD_PPPSA_PSA(val
);
1085 if ((afu
->pp_psa
= AFUD_PPPSA_PP(val
)))
1086 afu
->native
->pp_offset
= AFUD_READ_PPPSA_OFF(afu
);
1088 val
= AFUD_READ_CR(afu
);
1089 afu
->crs_len
= AFUD_CR_LEN(val
) * 256;
1090 afu
->crs_offset
= AFUD_READ_CR_OFF(afu
);
1093 /* eb_len is in multiple of 4K */
1094 afu
->eb_len
= AFUD_EB_LEN(AFUD_READ_EB(afu
)) * 4096;
1095 afu
->eb_offset
= AFUD_READ_EB_OFF(afu
);
1097 /* eb_off is 4K aligned so lower 12 bits are always zero */
1098 if (EXTRACT_PPC_BITS(afu
->eb_offset
, 0, 11) != 0) {
1100 "Invalid AFU error buffer offset %Lx\n",
1103 "Ignoring AFU error buffer in the descriptor\n");
1104 /* indicate that no afu buffer exists */
1111 static int cxl_afu_descriptor_looks_ok(struct cxl_afu
*afu
)
1116 if (afu
->psa
&& afu
->adapter
->ps_size
<
1117 (afu
->native
->pp_offset
+ afu
->pp_size
*afu
->max_procs_virtualised
)) {
1118 dev_err(&afu
->dev
, "per-process PSA can't fit inside the PSA!\n");
1122 if (afu
->pp_psa
&& (afu
->pp_size
< PAGE_SIZE
))
1123 dev_warn(&afu
->dev
, "AFU uses pp_size(%#016llx) < PAGE_SIZE per-process PSA!\n", afu
->pp_size
);
1125 for (i
= 0; i
< afu
->crs_num
; i
++) {
1126 rc
= cxl_ops
->afu_cr_read32(afu
, i
, 0, &val
);
1127 if (rc
|| val
== 0) {
1128 dev_err(&afu
->dev
, "ABORTING: AFU configuration record %i is invalid\n", i
);
1133 if ((afu
->modes_supported
& ~CXL_MODE_DEDICATED
) && afu
->max_procs_virtualised
== 0) {
1135 * We could also check this for the dedicated process model
1136 * since the architecture indicates it should be set to 1, but
1137 * in that case we ignore the value and I'd rather not risk
1138 * breaking any existing dedicated process AFUs that left it as
1139 * 0 (not that I'm aware of any). It is clearly an error for an
1140 * AFU directed AFU to set this to 0, and would have previously
1141 * triggered a bug resulting in the maximum not being enforced
1142 * at all since idr_alloc treats 0 as no maximum.
1144 dev_err(&afu
->dev
, "AFU does not support any processes\n");
1151 static int sanitise_afu_regs_psl9(struct cxl_afu
*afu
)
1156 * Clear out any regs that contain either an IVTE or address or may be
1157 * waiting on an acknowledgment to try to be a bit safer as we bring
1160 reg
= cxl_p2n_read(afu
, CXL_AFU_Cntl_An
);
1161 if ((reg
& CXL_AFU_Cntl_An_ES_MASK
) != CXL_AFU_Cntl_An_ES_Disabled
) {
1162 dev_warn(&afu
->dev
, "WARNING: AFU was not disabled: %#016llx\n", reg
);
1163 if (cxl_ops
->afu_reset(afu
))
1165 if (cxl_afu_disable(afu
))
1167 if (cxl_psl_purge(afu
))
1170 cxl_p1n_write(afu
, CXL_PSL_SPAP_An
, 0x0000000000000000);
1171 cxl_p1n_write(afu
, CXL_PSL_AMBAR_An
, 0x0000000000000000);
1172 reg
= cxl_p2n_read(afu
, CXL_PSL_DSISR_An
);
1174 dev_warn(&afu
->dev
, "AFU had pending DSISR: %#016llx\n", reg
);
1175 if (reg
& CXL_PSL9_DSISR_An_TF
)
1176 cxl_p2n_write(afu
, CXL_PSL_TFC_An
, CXL_PSL_TFC_An_AE
);
1178 cxl_p2n_write(afu
, CXL_PSL_TFC_An
, CXL_PSL_TFC_An_A
);
1180 if (afu
->adapter
->native
->sl_ops
->register_serr_irq
) {
1181 reg
= cxl_p1n_read(afu
, CXL_PSL_SERR_An
);
1183 if (reg
& ~0x000000007fffffff)
1184 dev_warn(&afu
->dev
, "AFU had pending SERR: %#016llx\n", reg
);
1185 cxl_p1n_write(afu
, CXL_PSL_SERR_An
, reg
& ~0xffff);
1188 reg
= cxl_p2n_read(afu
, CXL_PSL_ErrStat_An
);
1190 dev_warn(&afu
->dev
, "AFU had pending error status: %#016llx\n", reg
);
1191 cxl_p2n_write(afu
, CXL_PSL_ErrStat_An
, reg
);
1197 static int sanitise_afu_regs_psl8(struct cxl_afu
*afu
)
1202 * Clear out any regs that contain either an IVTE or address or may be
1203 * waiting on an acknowledgement to try to be a bit safer as we bring
1206 reg
= cxl_p2n_read(afu
, CXL_AFU_Cntl_An
);
1207 if ((reg
& CXL_AFU_Cntl_An_ES_MASK
) != CXL_AFU_Cntl_An_ES_Disabled
) {
1208 dev_warn(&afu
->dev
, "WARNING: AFU was not disabled: %#016llx\n", reg
);
1209 if (cxl_ops
->afu_reset(afu
))
1211 if (cxl_afu_disable(afu
))
1213 if (cxl_psl_purge(afu
))
1216 cxl_p1n_write(afu
, CXL_PSL_SPAP_An
, 0x0000000000000000);
1217 cxl_p1n_write(afu
, CXL_PSL_IVTE_Limit_An
, 0x0000000000000000);
1218 cxl_p1n_write(afu
, CXL_PSL_IVTE_Offset_An
, 0x0000000000000000);
1219 cxl_p1n_write(afu
, CXL_PSL_AMBAR_An
, 0x0000000000000000);
1220 cxl_p1n_write(afu
, CXL_PSL_SPOffset_An
, 0x0000000000000000);
1221 cxl_p1n_write(afu
, CXL_HAURP_An
, 0x0000000000000000);
1222 cxl_p2n_write(afu
, CXL_CSRP_An
, 0x0000000000000000);
1223 cxl_p2n_write(afu
, CXL_AURP1_An
, 0x0000000000000000);
1224 cxl_p2n_write(afu
, CXL_AURP0_An
, 0x0000000000000000);
1225 cxl_p2n_write(afu
, CXL_SSTP1_An
, 0x0000000000000000);
1226 cxl_p2n_write(afu
, CXL_SSTP0_An
, 0x0000000000000000);
1227 reg
= cxl_p2n_read(afu
, CXL_PSL_DSISR_An
);
1229 dev_warn(&afu
->dev
, "AFU had pending DSISR: %#016llx\n", reg
);
1230 if (reg
& CXL_PSL_DSISR_TRANS
)
1231 cxl_p2n_write(afu
, CXL_PSL_TFC_An
, CXL_PSL_TFC_An_AE
);
1233 cxl_p2n_write(afu
, CXL_PSL_TFC_An
, CXL_PSL_TFC_An_A
);
1235 if (afu
->adapter
->native
->sl_ops
->register_serr_irq
) {
1236 reg
= cxl_p1n_read(afu
, CXL_PSL_SERR_An
);
1239 dev_warn(&afu
->dev
, "AFU had pending SERR: %#016llx\n", reg
);
1240 cxl_p1n_write(afu
, CXL_PSL_SERR_An
, reg
& ~0xffff);
1243 reg
= cxl_p2n_read(afu
, CXL_PSL_ErrStat_An
);
1245 dev_warn(&afu
->dev
, "AFU had pending error status: %#016llx\n", reg
);
1246 cxl_p2n_write(afu
, CXL_PSL_ErrStat_An
, reg
);
1252 #define ERR_BUFF_MAX_COPY_SIZE PAGE_SIZE
1255 * Called from sysfs and reads the afu error info buffer. The h/w only supports
1256 * 4/8 bytes aligned access. So in case the requested offset/count arent 8 byte
1257 * aligned the function uses a bounce buffer which can be max PAGE_SIZE.
1259 ssize_t
cxl_pci_afu_read_err_buffer(struct cxl_afu
*afu
, char *buf
,
1260 loff_t off
, size_t count
)
1262 loff_t aligned_start
, aligned_end
;
1263 size_t aligned_length
;
1265 const void __iomem
*ebuf
= afu
->native
->afu_desc_mmio
+ afu
->eb_offset
;
1267 if (count
== 0 || off
< 0 || (size_t)off
>= afu
->eb_len
)
1270 /* calculate aligned read window */
1271 count
= min((size_t)(afu
->eb_len
- off
), count
);
1272 aligned_start
= round_down(off
, 8);
1273 aligned_end
= round_up(off
+ count
, 8);
1274 aligned_length
= aligned_end
- aligned_start
;
1276 /* max we can copy in one read is PAGE_SIZE */
1277 if (aligned_length
> ERR_BUFF_MAX_COPY_SIZE
) {
1278 aligned_length
= ERR_BUFF_MAX_COPY_SIZE
;
1279 count
= ERR_BUFF_MAX_COPY_SIZE
- (off
& 0x7);
1282 /* use bounce buffer for copy */
1283 tbuf
= (void *)__get_free_page(GFP_KERNEL
);
1287 /* perform aligned read from the mmio region */
1288 memcpy_fromio(tbuf
, ebuf
+ aligned_start
, aligned_length
);
1289 memcpy(buf
, tbuf
+ (off
& 0x7), count
);
1291 free_page((unsigned long)tbuf
);
1296 static int pci_configure_afu(struct cxl_afu
*afu
, struct cxl
*adapter
, struct pci_dev
*dev
)
1300 if ((rc
= pci_map_slice_regs(afu
, adapter
, dev
)))
1303 if (adapter
->native
->sl_ops
->sanitise_afu_regs
) {
1304 rc
= adapter
->native
->sl_ops
->sanitise_afu_regs(afu
);
1309 /* We need to reset the AFU before we can read the AFU descriptor */
1310 if ((rc
= cxl_ops
->afu_reset(afu
)))
1314 dump_afu_descriptor(afu
);
1316 if ((rc
= cxl_read_afu_descriptor(afu
)))
1319 if ((rc
= cxl_afu_descriptor_looks_ok(afu
)))
1322 if (adapter
->native
->sl_ops
->afu_regs_init
)
1323 if ((rc
= adapter
->native
->sl_ops
->afu_regs_init(afu
)))
1326 if (adapter
->native
->sl_ops
->register_serr_irq
)
1327 if ((rc
= adapter
->native
->sl_ops
->register_serr_irq(afu
)))
1330 if ((rc
= cxl_native_register_psl_irq(afu
)))
1333 atomic_set(&afu
->configured_state
, 0);
1337 if (adapter
->native
->sl_ops
->release_serr_irq
)
1338 adapter
->native
->sl_ops
->release_serr_irq(afu
);
1340 pci_unmap_slice_regs(afu
);
1344 static void pci_deconfigure_afu(struct cxl_afu
*afu
)
1347 * It's okay to deconfigure when AFU is already locked, otherwise wait
1348 * until there are no readers
1350 if (atomic_read(&afu
->configured_state
) != -1) {
1351 while (atomic_cmpxchg(&afu
->configured_state
, 0, -1) != -1)
1354 cxl_native_release_psl_irq(afu
);
1355 if (afu
->adapter
->native
->sl_ops
->release_serr_irq
)
1356 afu
->adapter
->native
->sl_ops
->release_serr_irq(afu
);
1357 pci_unmap_slice_regs(afu
);
1360 static int pci_init_afu(struct cxl
*adapter
, int slice
, struct pci_dev
*dev
)
1362 struct cxl_afu
*afu
;
1365 afu
= cxl_alloc_afu(adapter
, slice
);
1369 afu
->native
= kzalloc(sizeof(struct cxl_afu_native
), GFP_KERNEL
);
1373 mutex_init(&afu
->native
->spa_mutex
);
1375 rc
= dev_set_name(&afu
->dev
, "afu%i.%i", adapter
->adapter_num
, slice
);
1377 goto err_free_native
;
1379 rc
= pci_configure_afu(afu
, adapter
, dev
);
1381 goto err_free_native
;
1383 /* Don't care if this fails */
1384 cxl_debugfs_afu_add(afu
);
1387 * After we call this function we must not free the afu directly, even
1388 * if it returns an error!
1390 if ((rc
= cxl_register_afu(afu
)))
1393 if ((rc
= cxl_sysfs_afu_add(afu
)))
1396 adapter
->afu
[afu
->slice
] = afu
;
1398 if ((rc
= cxl_pci_vphb_add(afu
)))
1399 dev_info(&afu
->dev
, "Can't register vPHB\n");
1404 pci_deconfigure_afu(afu
);
1405 cxl_debugfs_afu_remove(afu
);
1406 device_unregister(&afu
->dev
);
1417 static void cxl_pci_remove_afu(struct cxl_afu
*afu
)
1419 pr_devel("%s\n", __func__
);
1424 cxl_pci_vphb_remove(afu
);
1425 cxl_sysfs_afu_remove(afu
);
1426 cxl_debugfs_afu_remove(afu
);
1428 spin_lock(&afu
->adapter
->afu_list_lock
);
1429 afu
->adapter
->afu
[afu
->slice
] = NULL
;
1430 spin_unlock(&afu
->adapter
->afu_list_lock
);
1432 cxl_context_detach_all(afu
);
1433 cxl_ops
->afu_deactivate_mode(afu
, afu
->current_mode
);
1435 pci_deconfigure_afu(afu
);
1436 device_unregister(&afu
->dev
);
1439 int cxl_pci_reset(struct cxl
*adapter
)
1441 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
1444 if (adapter
->perst_same_image
) {
1446 "cxl: refusing to reset/reflash when perst_reloads_same_image is set.\n");
1450 dev_info(&dev
->dev
, "CXL reset\n");
1453 * The adapter is about to be reset, so ignore errors.
1454 * Not supported on P9 DD1
1456 if ((cxl_is_power8()) || (!(cxl_is_power9_dd1())))
1457 cxl_data_cache_flush(adapter
);
1459 /* pcie_warm_reset requests a fundamental pci reset which includes a
1460 * PERST assert/deassert. PERST triggers a loading of the image
1461 * if "user" or "factory" is selected in sysfs */
1462 if ((rc
= pci_set_pcie_reset_state(dev
, pcie_warm_reset
))) {
1463 dev_err(&dev
->dev
, "cxl: pcie_warm_reset failed\n");
1470 static int cxl_map_adapter_regs(struct cxl
*adapter
, struct pci_dev
*dev
)
1472 if (pci_request_region(dev
, 2, "priv 2 regs"))
1474 if (pci_request_region(dev
, 0, "priv 1 regs"))
1477 pr_devel("cxl_map_adapter_regs: p1: %#016llx %#llx, p2: %#016llx %#llx",
1478 p1_base(dev
), p1_size(dev
), p2_base(dev
), p2_size(dev
));
1480 if (!(adapter
->native
->p1_mmio
= ioremap(p1_base(dev
), p1_size(dev
))))
1483 if (!(adapter
->native
->p2_mmio
= ioremap(p2_base(dev
), p2_size(dev
))))
1489 iounmap(adapter
->native
->p1_mmio
);
1490 adapter
->native
->p1_mmio
= NULL
;
1492 pci_release_region(dev
, 0);
1494 pci_release_region(dev
, 2);
1499 static void cxl_unmap_adapter_regs(struct cxl
*adapter
)
1501 if (adapter
->native
->p1_mmio
) {
1502 iounmap(adapter
->native
->p1_mmio
);
1503 adapter
->native
->p1_mmio
= NULL
;
1504 pci_release_region(to_pci_dev(adapter
->dev
.parent
), 2);
1506 if (adapter
->native
->p2_mmio
) {
1507 iounmap(adapter
->native
->p2_mmio
);
1508 adapter
->native
->p2_mmio
= NULL
;
1509 pci_release_region(to_pci_dev(adapter
->dev
.parent
), 0);
1513 static int cxl_read_vsec(struct cxl
*adapter
, struct pci_dev
*dev
)
1516 u32 afu_desc_off
, afu_desc_size
;
1517 u32 ps_off
, ps_size
;
1521 if (!(vsec
= find_cxl_vsec(dev
))) {
1522 dev_err(&dev
->dev
, "ABORTING: CXL VSEC not found!\n");
1526 CXL_READ_VSEC_LENGTH(dev
, vsec
, &vseclen
);
1527 if (vseclen
< CXL_VSEC_MIN_SIZE
) {
1528 dev_err(&dev
->dev
, "ABORTING: CXL VSEC too short\n");
1532 CXL_READ_VSEC_STATUS(dev
, vsec
, &adapter
->vsec_status
);
1533 CXL_READ_VSEC_PSL_REVISION(dev
, vsec
, &adapter
->psl_rev
);
1534 CXL_READ_VSEC_CAIA_MAJOR(dev
, vsec
, &adapter
->caia_major
);
1535 CXL_READ_VSEC_CAIA_MINOR(dev
, vsec
, &adapter
->caia_minor
);
1536 CXL_READ_VSEC_BASE_IMAGE(dev
, vsec
, &adapter
->base_image
);
1537 CXL_READ_VSEC_IMAGE_STATE(dev
, vsec
, &image_state
);
1538 adapter
->user_image_loaded
= !!(image_state
& CXL_VSEC_USER_IMAGE_LOADED
);
1539 adapter
->perst_select_user
= !!(image_state
& CXL_VSEC_USER_IMAGE_LOADED
);
1540 adapter
->perst_loads_image
= !!(image_state
& CXL_VSEC_PERST_LOADS_IMAGE
);
1542 CXL_READ_VSEC_NAFUS(dev
, vsec
, &adapter
->slices
);
1543 CXL_READ_VSEC_AFU_DESC_OFF(dev
, vsec
, &afu_desc_off
);
1544 CXL_READ_VSEC_AFU_DESC_SIZE(dev
, vsec
, &afu_desc_size
);
1545 CXL_READ_VSEC_PS_OFF(dev
, vsec
, &ps_off
);
1546 CXL_READ_VSEC_PS_SIZE(dev
, vsec
, &ps_size
);
1548 /* Convert everything to bytes, because there is NO WAY I'd look at the
1549 * code a month later and forget what units these are in ;-) */
1550 adapter
->native
->ps_off
= ps_off
* 64 * 1024;
1551 adapter
->ps_size
= ps_size
* 64 * 1024;
1552 adapter
->native
->afu_desc_off
= afu_desc_off
* 64 * 1024;
1553 adapter
->native
->afu_desc_size
= afu_desc_size
* 64 * 1024;
1555 /* Total IRQs - 1 PSL ERROR - #AFU*(1 slice error + 1 DSI) */
1556 adapter
->user_irqs
= pnv_cxl_get_irq_count(dev
) - 1 - 2*adapter
->slices
;
1562 * Workaround a PCIe Host Bridge defect on some cards, that can cause
1563 * malformed Transaction Layer Packet (TLP) errors to be erroneously
1564 * reported. Mask this error in the Uncorrectable Error Mask Register.
1566 * The upper nibble of the PSL revision is used to distinguish between
1567 * different cards. The affected ones have it set to 0.
1569 static void cxl_fixup_malformed_tlp(struct cxl
*adapter
, struct pci_dev
*dev
)
1574 if (adapter
->psl_rev
& 0xf000)
1576 if (!(aer
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ERR
)))
1578 pci_read_config_dword(dev
, aer
+ PCI_ERR_UNCOR_MASK
, &data
);
1579 if (data
& PCI_ERR_UNC_MALF_TLP
)
1580 if (data
& PCI_ERR_UNC_INTN
)
1582 data
|= PCI_ERR_UNC_MALF_TLP
;
1583 data
|= PCI_ERR_UNC_INTN
;
1584 pci_write_config_dword(dev
, aer
+ PCI_ERR_UNCOR_MASK
, data
);
1587 static bool cxl_compatible_caia_version(struct cxl
*adapter
)
1589 if (cxl_is_power8() && (adapter
->caia_major
== 1))
1592 if (cxl_is_power9() && (adapter
->caia_major
== 2))
1598 static int cxl_vsec_looks_ok(struct cxl
*adapter
, struct pci_dev
*dev
)
1600 if (adapter
->vsec_status
& CXL_STATUS_SECOND_PORT
)
1603 if (adapter
->vsec_status
& CXL_UNSUPPORTED_FEATURES
) {
1604 dev_err(&dev
->dev
, "ABORTING: CXL requires unsupported features\n");
1608 if (!cxl_compatible_caia_version(adapter
)) {
1609 dev_info(&dev
->dev
, "Ignoring card. PSL type is not supported (caia version: %d)\n",
1610 adapter
->caia_major
);
1614 if (!adapter
->slices
) {
1615 /* Once we support dynamic reprogramming we can use the card if
1616 * it supports loadable AFUs */
1617 dev_err(&dev
->dev
, "ABORTING: Device has no AFUs\n");
1621 if (!adapter
->native
->afu_desc_off
|| !adapter
->native
->afu_desc_size
) {
1622 dev_err(&dev
->dev
, "ABORTING: VSEC shows no AFU descriptors\n");
1626 if (adapter
->ps_size
> p2_size(dev
) - adapter
->native
->ps_off
) {
1627 dev_err(&dev
->dev
, "ABORTING: Problem state size larger than "
1628 "available in BAR2: 0x%llx > 0x%llx\n",
1629 adapter
->ps_size
, p2_size(dev
) - adapter
->native
->ps_off
);
1636 ssize_t
cxl_pci_read_adapter_vpd(struct cxl
*adapter
, void *buf
, size_t len
)
1638 return pci_read_vpd(to_pci_dev(adapter
->dev
.parent
), 0, len
, buf
);
1641 static void cxl_release_adapter(struct device
*dev
)
1643 struct cxl
*adapter
= to_cxl_adapter(dev
);
1645 pr_devel("cxl_release_adapter\n");
1647 cxl_remove_adapter_nr(adapter
);
1649 kfree(adapter
->native
);
1653 #define CXL_PSL_ErrIVTE_tberror (0x1ull << (63-31))
1655 static int sanitise_adapter_regs(struct cxl
*adapter
)
1659 /* Clear PSL tberror bit by writing 1 to it */
1660 cxl_p1_write(adapter
, CXL_PSL_ErrIVTE
, CXL_PSL_ErrIVTE_tberror
);
1662 if (adapter
->native
->sl_ops
->invalidate_all
) {
1663 /* do not invalidate ERAT entries when not reloading on PERST */
1664 if (cxl_is_power9() && (adapter
->perst_loads_image
))
1666 rc
= adapter
->native
->sl_ops
->invalidate_all(adapter
);
1672 /* This should contain *only* operations that can safely be done in
1673 * both creation and recovery.
1675 static int cxl_configure_adapter(struct cxl
*adapter
, struct pci_dev
*dev
)
1679 adapter
->dev
.parent
= &dev
->dev
;
1680 adapter
->dev
.release
= cxl_release_adapter
;
1681 pci_set_drvdata(dev
, adapter
);
1683 rc
= pci_enable_device(dev
);
1685 dev_err(&dev
->dev
, "pci_enable_device failed: %i\n", rc
);
1689 if ((rc
= cxl_read_vsec(adapter
, dev
)))
1692 if ((rc
= cxl_vsec_looks_ok(adapter
, dev
)))
1695 cxl_fixup_malformed_tlp(adapter
, dev
);
1697 if ((rc
= setup_cxl_bars(dev
)))
1700 if ((rc
= setup_cxl_protocol_area(dev
)))
1703 if ((rc
= cxl_update_image_control(adapter
)))
1706 if ((rc
= cxl_map_adapter_regs(adapter
, dev
)))
1709 if ((rc
= sanitise_adapter_regs(adapter
)))
1712 if ((rc
= adapter
->native
->sl_ops
->adapter_regs_init(adapter
, dev
)))
1715 /* Required for devices using CAPP DMA mode, harmless for others */
1716 pci_set_master(dev
);
1718 if ((rc
= pnv_phb_to_cxl_mode(dev
, adapter
->native
->sl_ops
->capi_mode
)))
1721 /* If recovery happened, the last step is to turn on snooping.
1722 * In the non-recovery case this has no effect */
1723 if ((rc
= pnv_phb_to_cxl_mode(dev
, OPAL_PHB_CAPI_MODE_SNOOP_ON
)))
1726 /* Ignore error, adapter init is not dependant on timebase sync */
1727 cxl_setup_psl_timebase(adapter
, dev
);
1729 if ((rc
= cxl_native_register_psl_err_irq(adapter
)))
1735 cxl_unmap_adapter_regs(adapter
);
1740 static void cxl_deconfigure_adapter(struct cxl
*adapter
)
1742 struct pci_dev
*pdev
= to_pci_dev(adapter
->dev
.parent
);
1744 cxl_native_release_psl_err_irq(adapter
);
1745 cxl_unmap_adapter_regs(adapter
);
1747 pci_disable_device(pdev
);
1750 static void cxl_stop_trace_psl9(struct cxl
*adapter
)
1753 u64 trace_state
, trace_mask
;
1754 struct pci_dev
*dev
= to_pci_dev(adapter
->dev
.parent
);
1756 /* read each tracearray state and issue mmio to stop them is needed */
1757 for (traceid
= 0; traceid
<= CXL_PSL9_TRACEID_MAX
; ++traceid
) {
1758 trace_state
= cxl_p1_read(adapter
, CXL_PSL9_CTCCFG
);
1759 trace_mask
= (0x3ULL
<< (62 - traceid
* 2));
1760 trace_state
= (trace_state
& trace_mask
) >> (62 - traceid
* 2);
1761 dev_dbg(&dev
->dev
, "cxl: Traceid-%d trace_state=0x%0llX\n",
1762 traceid
, trace_state
);
1764 /* issue mmio if the trace array isn't in FIN state */
1765 if (trace_state
!= CXL_PSL9_TRACESTATE_FIN
)
1766 cxl_p1_write(adapter
, CXL_PSL9_TRACECFG
,
1767 0x8400000000000000ULL
| traceid
);
1771 static void cxl_stop_trace_psl8(struct cxl
*adapter
)
1775 /* Stop the trace */
1776 cxl_p1_write(adapter
, CXL_PSL_TRACE
, 0x8000000000000017LL
);
1778 /* Stop the slice traces */
1779 spin_lock(&adapter
->afu_list_lock
);
1780 for (slice
= 0; slice
< adapter
->slices
; slice
++) {
1781 if (adapter
->afu
[slice
])
1782 cxl_p1n_write(adapter
->afu
[slice
], CXL_PSL_SLICE_TRACE
,
1783 0x8000000000000000LL
);
1785 spin_unlock(&adapter
->afu_list_lock
);
1788 static const struct cxl_service_layer_ops psl9_ops
= {
1789 .adapter_regs_init
= init_implementation_adapter_regs_psl9
,
1790 .invalidate_all
= cxl_invalidate_all_psl9
,
1791 .afu_regs_init
= init_implementation_afu_regs_psl9
,
1792 .sanitise_afu_regs
= sanitise_afu_regs_psl9
,
1793 .register_serr_irq
= cxl_native_register_serr_irq
,
1794 .release_serr_irq
= cxl_native_release_serr_irq
,
1795 .handle_interrupt
= cxl_irq_psl9
,
1796 .fail_irq
= cxl_fail_irq_psl
,
1797 .activate_dedicated_process
= cxl_activate_dedicated_process_psl9
,
1798 .attach_afu_directed
= cxl_attach_afu_directed_psl9
,
1799 .attach_dedicated_process
= cxl_attach_dedicated_process_psl9
,
1800 .update_dedicated_ivtes
= cxl_update_dedicated_ivtes_psl9
,
1801 .debugfs_add_adapter_regs
= cxl_debugfs_add_adapter_regs_psl9
,
1802 .debugfs_add_afu_regs
= cxl_debugfs_add_afu_regs_psl9
,
1803 .psl_irq_dump_registers
= cxl_native_irq_dump_regs_psl9
,
1804 .err_irq_dump_registers
= cxl_native_err_irq_dump_regs_psl9
,
1805 .debugfs_stop_trace
= cxl_stop_trace_psl9
,
1806 .write_timebase_ctrl
= write_timebase_ctrl_psl9
,
1807 .timebase_read
= timebase_read_psl9
,
1808 .capi_mode
= OPAL_PHB_CAPI_MODE_CAPI
,
1809 .needs_reset_before_disable
= true,
1812 static const struct cxl_service_layer_ops psl8_ops
= {
1813 .adapter_regs_init
= init_implementation_adapter_regs_psl8
,
1814 .invalidate_all
= cxl_invalidate_all_psl8
,
1815 .afu_regs_init
= init_implementation_afu_regs_psl8
,
1816 .sanitise_afu_regs
= sanitise_afu_regs_psl8
,
1817 .register_serr_irq
= cxl_native_register_serr_irq
,
1818 .release_serr_irq
= cxl_native_release_serr_irq
,
1819 .handle_interrupt
= cxl_irq_psl8
,
1820 .fail_irq
= cxl_fail_irq_psl
,
1821 .activate_dedicated_process
= cxl_activate_dedicated_process_psl8
,
1822 .attach_afu_directed
= cxl_attach_afu_directed_psl8
,
1823 .attach_dedicated_process
= cxl_attach_dedicated_process_psl8
,
1824 .update_dedicated_ivtes
= cxl_update_dedicated_ivtes_psl8
,
1825 .debugfs_add_adapter_regs
= cxl_debugfs_add_adapter_regs_psl8
,
1826 .debugfs_add_afu_regs
= cxl_debugfs_add_afu_regs_psl8
,
1827 .psl_irq_dump_registers
= cxl_native_irq_dump_regs_psl8
,
1828 .err_irq_dump_registers
= cxl_native_err_irq_dump_regs_psl8
,
1829 .debugfs_stop_trace
= cxl_stop_trace_psl8
,
1830 .write_timebase_ctrl
= write_timebase_ctrl_psl8
,
1831 .timebase_read
= timebase_read_psl8
,
1832 .capi_mode
= OPAL_PHB_CAPI_MODE_CAPI
,
1833 .needs_reset_before_disable
= true,
1836 static const struct cxl_service_layer_ops xsl_ops
= {
1837 .adapter_regs_init
= init_implementation_adapter_regs_xsl
,
1838 .invalidate_all
= cxl_invalidate_all_psl8
,
1839 .sanitise_afu_regs
= sanitise_afu_regs_psl8
,
1840 .handle_interrupt
= cxl_irq_psl8
,
1841 .fail_irq
= cxl_fail_irq_psl
,
1842 .activate_dedicated_process
= cxl_activate_dedicated_process_psl8
,
1843 .attach_afu_directed
= cxl_attach_afu_directed_psl8
,
1844 .attach_dedicated_process
= cxl_attach_dedicated_process_psl8
,
1845 .update_dedicated_ivtes
= cxl_update_dedicated_ivtes_psl8
,
1846 .debugfs_add_adapter_regs
= cxl_debugfs_add_adapter_regs_xsl
,
1847 .write_timebase_ctrl
= write_timebase_ctrl_xsl
,
1848 .timebase_read
= timebase_read_xsl
,
1849 .capi_mode
= OPAL_PHB_CAPI_MODE_DMA
,
1852 static void set_sl_ops(struct cxl
*adapter
, struct pci_dev
*dev
)
1854 if (dev
->vendor
== PCI_VENDOR_ID_MELLANOX
&& dev
->device
== 0x1013) {
1856 dev_info(&dev
->dev
, "Device uses an XSL\n");
1857 adapter
->native
->sl_ops
= &xsl_ops
;
1858 adapter
->min_pe
= 1; /* Workaround for CX-4 hardware bug */
1860 if (cxl_is_power8()) {
1861 dev_info(&dev
->dev
, "Device uses a PSL8\n");
1862 adapter
->native
->sl_ops
= &psl8_ops
;
1864 dev_info(&dev
->dev
, "Device uses a PSL9\n");
1865 adapter
->native
->sl_ops
= &psl9_ops
;
1871 static struct cxl
*cxl_pci_init_adapter(struct pci_dev
*dev
)
1873 struct cxl
*adapter
;
1876 adapter
= cxl_alloc_adapter();
1878 return ERR_PTR(-ENOMEM
);
1880 adapter
->native
= kzalloc(sizeof(struct cxl_native
), GFP_KERNEL
);
1881 if (!adapter
->native
) {
1886 set_sl_ops(adapter
, dev
);
1888 /* Set defaults for parameters which need to persist over
1889 * configure/reconfigure
1891 adapter
->perst_loads_image
= true;
1892 adapter
->perst_same_image
= false;
1894 rc
= cxl_configure_adapter(adapter
, dev
);
1896 pci_disable_device(dev
);
1900 /* Don't care if this one fails: */
1901 cxl_debugfs_adapter_add(adapter
);
1904 * After we call this function we must not free the adapter directly,
1905 * even if it returns an error!
1907 if ((rc
= cxl_register_adapter(adapter
)))
1910 if ((rc
= cxl_sysfs_adapter_add(adapter
)))
1913 /* Release the context lock as adapter is configured */
1914 cxl_adapter_context_unlock(adapter
);
1919 /* This should mirror cxl_remove_adapter, except without the
1922 cxl_debugfs_adapter_remove(adapter
);
1923 cxl_deconfigure_adapter(adapter
);
1924 device_unregister(&adapter
->dev
);
1928 cxl_release_adapter(&adapter
->dev
);
1932 static void cxl_pci_remove_adapter(struct cxl
*adapter
)
1934 pr_devel("cxl_remove_adapter\n");
1936 cxl_sysfs_adapter_remove(adapter
);
1937 cxl_debugfs_adapter_remove(adapter
);
1940 * Flush adapter datacache as its about to be removed.
1941 * Not supported on P9 DD1.
1943 if ((cxl_is_power8()) || (!(cxl_is_power9_dd1())))
1944 cxl_data_cache_flush(adapter
);
1946 cxl_deconfigure_adapter(adapter
);
1948 device_unregister(&adapter
->dev
);
1951 #define CXL_MAX_PCIEX_PARENT 2
1953 int cxl_slot_is_switched(struct pci_dev
*dev
)
1955 struct device_node
*np
;
1959 if (!(np
= pci_device_to_OF_node(dev
))) {
1960 pr_err("cxl: np = NULL\n");
1965 np
= of_get_next_parent(np
);
1966 prop
= of_get_property(np
, "device_type", NULL
);
1967 if (!prop
|| strcmp((char *)prop
, "pciex"))
1972 return (depth
> CXL_MAX_PCIEX_PARENT
);
1975 bool cxl_slot_is_supported(struct pci_dev
*dev
, int flags
)
1977 if (!cpu_has_feature(CPU_FTR_HVMODE
))
1980 if ((flags
& CXL_SLOT_FLAG_DMA
) && (!pvr_version_is(PVR_POWER8NVL
))) {
1982 * CAPP DMA mode is technically supported on regular P8, but
1983 * will EEH if the card attempts to access memory < 4GB, which
1984 * we cannot realistically avoid. We might be able to work
1985 * around the issue, but until then return unsupported:
1990 if (cxl_slot_is_switched(dev
))
1994 * XXX: This gets a little tricky on regular P8 (not POWER8NVL) since
1995 * the CAPP can be connected to PHB 0, 1 or 2 on a first come first
1996 * served basis, which is racy to check from here. If we need to
1997 * support this in future we might need to consider having this
1998 * function effectively reserve it ahead of time.
2000 * Currently, the only user of this API is the Mellanox CX4, which is
2001 * only supported on P8NVL due to the above mentioned limitation of
2002 * CAPP DMA mode and therefore does not need to worry about this. If the
2003 * issue with CAPP DMA mode is later worked around on P8 we might need
2009 EXPORT_SYMBOL_GPL(cxl_slot_is_supported
);
2012 static int cxl_probe(struct pci_dev
*dev
, const struct pci_device_id
*id
)
2014 struct cxl
*adapter
;
2018 if (cxl_pci_is_vphb_device(dev
)) {
2019 dev_dbg(&dev
->dev
, "cxl_init_adapter: Ignoring cxl vphb device\n");
2023 if (cxl_slot_is_switched(dev
)) {
2024 dev_info(&dev
->dev
, "Ignoring card on incompatible PCI slot\n");
2028 if (cxl_is_power9() && !radix_enabled()) {
2029 dev_info(&dev
->dev
, "Only Radix mode supported\n");
2034 dump_cxl_config_space(dev
);
2036 adapter
= cxl_pci_init_adapter(dev
);
2037 if (IS_ERR(adapter
)) {
2038 dev_err(&dev
->dev
, "cxl_init_adapter failed: %li\n", PTR_ERR(adapter
));
2039 return PTR_ERR(adapter
);
2042 for (slice
= 0; slice
< adapter
->slices
; slice
++) {
2043 if ((rc
= pci_init_afu(adapter
, slice
, dev
))) {
2044 dev_err(&dev
->dev
, "AFU %i failed to initialise: %i\n", slice
, rc
);
2048 rc
= cxl_afu_select_best_mode(adapter
->afu
[slice
]);
2050 dev_err(&dev
->dev
, "AFU %i failed to start: %i\n", slice
, rc
);
2053 if (pnv_pci_on_cxl_phb(dev
) && adapter
->slices
>= 1)
2054 pnv_cxl_phb_set_peer_afu(dev
, adapter
->afu
[0]);
2059 static void cxl_remove(struct pci_dev
*dev
)
2061 struct cxl
*adapter
= pci_get_drvdata(dev
);
2062 struct cxl_afu
*afu
;
2066 * Lock to prevent someone grabbing a ref through the adapter list as
2067 * we are removing it
2069 for (i
= 0; i
< adapter
->slices
; i
++) {
2070 afu
= adapter
->afu
[i
];
2071 cxl_pci_remove_afu(afu
);
2073 cxl_pci_remove_adapter(adapter
);
2076 static pci_ers_result_t
cxl_vphb_error_detected(struct cxl_afu
*afu
,
2077 pci_channel_state_t state
)
2079 struct pci_dev
*afu_dev
;
2080 pci_ers_result_t result
= PCI_ERS_RESULT_NEED_RESET
;
2081 pci_ers_result_t afu_result
= PCI_ERS_RESULT_NEED_RESET
;
2083 /* There should only be one entry, but go through the list
2086 if (afu
->phb
== NULL
)
2089 list_for_each_entry(afu_dev
, &afu
->phb
->bus
->devices
, bus_list
) {
2090 if (!afu_dev
->driver
)
2093 afu_dev
->error_state
= state
;
2095 if (afu_dev
->driver
->err_handler
)
2096 afu_result
= afu_dev
->driver
->err_handler
->error_detected(afu_dev
,
2098 /* Disconnect trumps all, NONE trumps NEED_RESET */
2099 if (afu_result
== PCI_ERS_RESULT_DISCONNECT
)
2100 result
= PCI_ERS_RESULT_DISCONNECT
;
2101 else if ((afu_result
== PCI_ERS_RESULT_NONE
) &&
2102 (result
== PCI_ERS_RESULT_NEED_RESET
))
2103 result
= PCI_ERS_RESULT_NONE
;
2108 static pci_ers_result_t
cxl_pci_error_detected(struct pci_dev
*pdev
,
2109 pci_channel_state_t state
)
2111 struct cxl
*adapter
= pci_get_drvdata(pdev
);
2112 struct cxl_afu
*afu
;
2113 pci_ers_result_t result
= PCI_ERS_RESULT_NEED_RESET
, afu_result
;
2116 /* At this point, we could still have an interrupt pending.
2117 * Let's try to get them out of the way before they do
2118 * anything we don't like.
2122 /* If we're permanently dead, give up. */
2123 if (state
== pci_channel_io_perm_failure
) {
2124 for (i
= 0; i
< adapter
->slices
; i
++) {
2125 afu
= adapter
->afu
[i
];
2127 * Tell the AFU drivers; but we don't care what they
2128 * say, we're going away.
2130 cxl_vphb_error_detected(afu
, state
);
2132 return PCI_ERS_RESULT_DISCONNECT
;
2135 /* Are we reflashing?
2137 * If we reflash, we could come back as something entirely
2138 * different, including a non-CAPI card. As such, by default
2139 * we don't participate in the process. We'll be unbound and
2140 * the slot re-probed. (TODO: check EEH doesn't blindly rebind
2143 * However, this isn't the entire story: for reliablity
2144 * reasons, we usually want to reflash the FPGA on PERST in
2145 * order to get back to a more reliable known-good state.
2147 * This causes us a bit of a problem: if we reflash we can't
2148 * trust that we'll come back the same - we could have a new
2149 * image and been PERSTed in order to load that
2150 * image. However, most of the time we actually *will* come
2151 * back the same - for example a regular EEH event.
2153 * Therefore, we allow the user to assert that the image is
2154 * indeed the same and that we should continue on into EEH
2157 if (adapter
->perst_loads_image
&& !adapter
->perst_same_image
) {
2158 /* TODO take the PHB out of CXL mode */
2159 dev_info(&pdev
->dev
, "reflashing, so opting out of EEH!\n");
2160 return PCI_ERS_RESULT_NONE
;
2164 * At this point, we want to try to recover. We'll always
2165 * need a complete slot reset: we don't trust any other reset.
2167 * Now, we go through each AFU:
2168 * - We send the driver, if bound, an error_detected callback.
2169 * We expect it to clean up, but it can also tell us to give
2170 * up and permanently detach the card. To simplify things, if
2171 * any bound AFU driver doesn't support EEH, we give up on EEH.
2173 * - We detach all contexts associated with the AFU. This
2174 * does not free them, but puts them into a CLOSED state
2175 * which causes any the associated files to return useful
2176 * errors to userland. It also unmaps, but does not free,
2179 * - We clean up our side: releasing and unmapping resources we hold
2180 * so we can wire them up again when the hardware comes back up.
2182 * Driver authors should note:
2184 * - Any contexts you create in your kernel driver (except
2185 * those associated with anonymous file descriptors) are
2186 * your responsibility to free and recreate. Likewise with
2187 * any attached resources.
2189 * - We will take responsibility for re-initialising the
2190 * device context (the one set up for you in
2191 * cxl_pci_enable_device_hook and accessed through
2192 * cxl_get_context). If you've attached IRQs or other
2193 * resources to it, they remains yours to free.
2195 * You can call the same functions to release resources as you
2196 * normally would: we make sure that these functions continue
2197 * to work when the hardware is down.
2201 * 1) If you normally free all your resources at the end of
2202 * each request, or if you use anonymous FDs, your
2203 * error_detected callback can simply set a flag to tell
2204 * your driver not to start any new calls. You can then
2205 * clear the flag in the resume callback.
2207 * 2) If you normally allocate your resources on startup:
2208 * * Set a flag in error_detected as above.
2209 * * Let CXL detach your contexts.
2210 * * In slot_reset, free the old resources and allocate new ones.
2211 * * In resume, clear the flag to allow things to start.
2213 for (i
= 0; i
< adapter
->slices
; i
++) {
2214 afu
= adapter
->afu
[i
];
2216 afu_result
= cxl_vphb_error_detected(afu
, state
);
2218 cxl_context_detach_all(afu
);
2219 cxl_ops
->afu_deactivate_mode(afu
, afu
->current_mode
);
2220 pci_deconfigure_afu(afu
);
2222 /* Disconnect trumps all, NONE trumps NEED_RESET */
2223 if (afu_result
== PCI_ERS_RESULT_DISCONNECT
)
2224 result
= PCI_ERS_RESULT_DISCONNECT
;
2225 else if ((afu_result
== PCI_ERS_RESULT_NONE
) &&
2226 (result
== PCI_ERS_RESULT_NEED_RESET
))
2227 result
= PCI_ERS_RESULT_NONE
;
2230 /* should take the context lock here */
2231 if (cxl_adapter_context_lock(adapter
) != 0)
2232 dev_warn(&adapter
->dev
,
2233 "Couldn't take context lock with %d active-contexts\n",
2234 atomic_read(&adapter
->contexts_num
));
2236 cxl_deconfigure_adapter(adapter
);
2241 static pci_ers_result_t
cxl_pci_slot_reset(struct pci_dev
*pdev
)
2243 struct cxl
*adapter
= pci_get_drvdata(pdev
);
2244 struct cxl_afu
*afu
;
2245 struct cxl_context
*ctx
;
2246 struct pci_dev
*afu_dev
;
2247 pci_ers_result_t afu_result
= PCI_ERS_RESULT_RECOVERED
;
2248 pci_ers_result_t result
= PCI_ERS_RESULT_RECOVERED
;
2251 if (cxl_configure_adapter(adapter
, pdev
))
2255 * Unlock context activation for the adapter. Ideally this should be
2256 * done in cxl_pci_resume but cxlflash module tries to activate the
2257 * master context as part of slot_reset callback.
2259 cxl_adapter_context_unlock(adapter
);
2261 for (i
= 0; i
< adapter
->slices
; i
++) {
2262 afu
= adapter
->afu
[i
];
2264 if (pci_configure_afu(afu
, adapter
, pdev
))
2267 if (cxl_afu_select_best_mode(afu
))
2270 if (afu
->phb
== NULL
)
2273 list_for_each_entry(afu_dev
, &afu
->phb
->bus
->devices
, bus_list
) {
2274 /* Reset the device context.
2275 * TODO: make this less disruptive
2277 ctx
= cxl_get_context(afu_dev
);
2279 if (ctx
&& cxl_release_context(ctx
))
2282 ctx
= cxl_dev_context_init(afu_dev
);
2286 afu_dev
->dev
.archdata
.cxl_ctx
= ctx
;
2288 if (cxl_ops
->afu_check_and_enable(afu
))
2291 afu_dev
->error_state
= pci_channel_io_normal
;
2293 /* If there's a driver attached, allow it to
2294 * chime in on recovery. Drivers should check
2295 * if everything has come back OK, but
2296 * shouldn't start new work until we call
2297 * their resume function.
2299 if (!afu_dev
->driver
)
2302 if (afu_dev
->driver
->err_handler
&&
2303 afu_dev
->driver
->err_handler
->slot_reset
)
2304 afu_result
= afu_dev
->driver
->err_handler
->slot_reset(afu_dev
);
2306 if (afu_result
== PCI_ERS_RESULT_DISCONNECT
)
2307 result
= PCI_ERS_RESULT_DISCONNECT
;
2313 /* All the bits that happen in both error_detected and cxl_remove
2314 * should be idempotent, so we don't need to worry about leaving a mix
2315 * of unconfigured and reconfigured resources.
2317 dev_err(&pdev
->dev
, "EEH recovery failed. Asking to be disconnected.\n");
2318 return PCI_ERS_RESULT_DISCONNECT
;
2321 static void cxl_pci_resume(struct pci_dev
*pdev
)
2323 struct cxl
*adapter
= pci_get_drvdata(pdev
);
2324 struct cxl_afu
*afu
;
2325 struct pci_dev
*afu_dev
;
2328 /* Everything is back now. Drivers should restart work now.
2329 * This is not the place to be checking if everything came back up
2330 * properly, because there's no return value: do that in slot_reset.
2332 for (i
= 0; i
< adapter
->slices
; i
++) {
2333 afu
= adapter
->afu
[i
];
2335 if (afu
->phb
== NULL
)
2338 list_for_each_entry(afu_dev
, &afu
->phb
->bus
->devices
, bus_list
) {
2339 if (afu_dev
->driver
&& afu_dev
->driver
->err_handler
&&
2340 afu_dev
->driver
->err_handler
->resume
)
2341 afu_dev
->driver
->err_handler
->resume(afu_dev
);
2346 static const struct pci_error_handlers cxl_err_handler
= {
2347 .error_detected
= cxl_pci_error_detected
,
2348 .slot_reset
= cxl_pci_slot_reset
,
2349 .resume
= cxl_pci_resume
,
2352 struct pci_driver cxl_pci_driver
= {
2354 .id_table
= cxl_pci_tbl
,
2356 .remove
= cxl_remove
,
2357 .shutdown
= cxl_remove
,
2358 .err_handler
= &cxl_err_handler
,