| 1 | /* |
| 2 | * Call Logical Processor (CLP) architecture |
| 3 | * |
| 4 | * Copyright 2025 IBM Corp. |
| 5 | * Author(s): Jared Rossi <jrossi@linux.ibm.com> |
| 6 | * |
| 7 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 8 | */ |
| 9 | |
| 10 | #include "clp.h" |
| 11 | #include <stdio.h> |
| 12 | #include <string.h> |
| 13 | |
| 14 | int clp_pci(void *data) |
| 15 | { |
| 16 | struct { uint8_t _[CLP_BLK_SIZE]; } *req = data; |
| 17 | int cc = 3; |
| 18 | |
| 19 | asm volatile ( |
| 20 | " .insn rrf,0xb9a00000,0,%[req],0,2\n" |
| 21 | " ipm %[cc]\n" |
| 22 | " srl %[cc],28\n" |
| 23 | : [cc] "+d" (cc), "+m" (*req) |
| 24 | : [req] "a" (req) |
| 25 | : "cc"); |
| 26 | if (cc) { |
| 27 | printf("CLP returned with non-zero condition code %d\n", cc); |
| 28 | } |
| 29 | return cc; |
| 30 | } |
| 31 | |
| 32 | /* |
| 33 | * Get the PCI function entry for a given function ID |
| 34 | * Return 0 on success, 1 if the FID is not found, or a negative RC on error |
| 35 | */ |
| 36 | int find_pci_function(uint32_t fid, ClpFhListEntry *entry) |
| 37 | { |
| 38 | int count = 0; |
| 39 | int limit = PCI_MAX_FUNCTIONS; |
| 40 | ClpReqRspListPci rrb; |
| 41 | |
| 42 | rrb.request.hdr.len = sizeof(ClpReqListPci); |
| 43 | rrb.request.hdr.cmd = 0x02; |
| 44 | rrb.request.resume_token = 0; |
| 45 | rrb.response.hdr.len = sizeof(ClpRspListPci); |
| 46 | |
| 47 | do { |
| 48 | if (clp_pci(&rrb) || rrb.response.hdr.rsp != 0x0010) { |
| 49 | puts("Failed to list PCI functions"); |
| 50 | return -1; |
| 51 | } |
| 52 | |
| 53 | /* Resume token set when max entries are returned */ |
| 54 | if (rrb.response.resume_token) { |
| 55 | count = CLP_FH_LIST_NR_ENTRIES; |
| 56 | rrb.request.resume_token = rrb.response.resume_token; |
| 57 | } else { |
| 58 | count = (rrb.response.hdr.len - 32) / sizeof(ClpFhListEntry); |
| 59 | } |
| 60 | |
| 61 | limit -= count; |
| 62 | |
| 63 | for (int i = 0; i < count; i++) { |
| 64 | if (rrb.response.fh_list[i].fid == fid) { |
| 65 | memcpy(entry, &rrb.response.fh_list[i], sizeof(ClpFhListEntry)); |
| 66 | return 0; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | } while (rrb.request.resume_token && limit > 0); |
| 71 | |
| 72 | puts("No function entry found for FID!"); |
| 73 | |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * Enable the PCI function associated with a given handle |
| 79 | * Return 0 on success or a negative RC on error |
| 80 | */ |
| 81 | int enable_pci_function(uint32_t *fhandle) |
| 82 | { |
| 83 | ClpReqRspSetPci rrb; |
| 84 | |
| 85 | rrb.request.hdr.len = sizeof(ClpReqSetPci); |
| 86 | rrb.request.hdr.cmd = 0x05; |
| 87 | rrb.request.fh = *fhandle; |
| 88 | rrb.request.oc = 0; |
| 89 | rrb.request.ndas = 1; |
| 90 | rrb.response.hdr.len = sizeof(ClpRspSetPci); |
| 91 | |
| 92 | if (clp_pci(&rrb) || rrb.response.hdr.rsp != 0x0010) { |
| 93 | puts("Failed to enable PCI function"); |
| 94 | return -1; |
| 95 | } |
| 96 | |
| 97 | *fhandle = rrb.response.fh; |
| 98 | return 0; |
| 99 | } |