1 /* SPDX-License-Identifier: BSD-3-Clause
2 *
3 * Copyright(c) 2019-2021 Xilinx, Inc.
4 * Copyright(c) 2019 Solarflare Communications Inc.
5 */
6
7 #include "efx.h"
8 #include "efx_impl.h"
9
10 #if EFSYS_OPT_RIVERHEAD && EFSYS_OPT_PCI
11
12 /*
13 * Search for a EF100 resource locator from the given offset of an entry
14 * in a Xilinx capabilities table.
15 */
16 static __checkReturn efx_rc_t
rhead_xilinx_cap_tbl_find_ef100_locator(__in efsys_bar_t * esbp,__in efsys_dma_addr_t tbl_offset,__out efx_bar_region_t * ef100_ebrp)17 rhead_xilinx_cap_tbl_find_ef100_locator(
18 __in efsys_bar_t *esbp,
19 __in efsys_dma_addr_t tbl_offset,
20 __out efx_bar_region_t *ef100_ebrp)
21 {
22 efx_rc_t rc;
23 efsys_dma_addr_t entry_offset = tbl_offset;
24
25 rc = efx_pci_xilinx_cap_tbl_find(esbp, ESE_GZ_CFGBAR_ENTRY_EF100,
26 B_FALSE, &entry_offset);
27 if (rc != 0) {
28 /* EF100 locator not found (ENOENT) or other error */
29 goto fail1;
30 }
31
32 rc = rhead_nic_xilinx_cap_tbl_read_ef100_locator(esbp, entry_offset,
33 ef100_ebrp);
34 if (rc != 0)
35 goto fail2;
36
37 return (0);
38
39 fail2:
40 EFSYS_PROBE(fail2);
41 fail1:
42 EFSYS_PROBE1(fail1, efx_rc_t, rc);
43
44 return (rc);
45 }
46
47 __checkReturn efx_rc_t
rhead_pci_nic_membar_lookup(__in efsys_pci_config_t * espcp,__in const efx_pci_ops_t * epop,__out efx_bar_region_t * ebrp)48 rhead_pci_nic_membar_lookup(
49 __in efsys_pci_config_t *espcp,
50 __in const efx_pci_ops_t *epop,
51 __out efx_bar_region_t *ebrp)
52 {
53 boolean_t xilinx_tbl_found = B_FALSE;
54 unsigned int xilinx_tbl_bar;
55 efsys_dma_addr_t xilinx_tbl_offset;
56 size_t pci_capa_offset = 0;
57 boolean_t bar_found = B_FALSE;
58 efx_rc_t rc = ENOENT;
59 efsys_bar_t xil_eb;
60 efsys_bar_t nic_eb;
61 efx_dword_t magic_ed;
62 uint32_t magic;
63
64 /*
65 * SF-119689-TC Riverhead Host Interface section 4.2.2. describes
66 * the following discovery steps.
67 */
68 while (1) {
69 rc = efx_pci_find_next_xilinx_cap_table(espcp, epop,
70 &pci_capa_offset,
71 &xilinx_tbl_bar,
72 &xilinx_tbl_offset);
73 if (rc != 0) {
74 /*
75 * SF-119689-TC Riverhead Host Interface section 4.2.2.
76 * defines the following fallbacks for the memory bar
77 * and the offset when no Xilinx capabilities table is
78 * found.
79 */
80 if (rc == ENOENT && xilinx_tbl_found == B_FALSE) {
81 ebrp->ebr_type = EFX_BAR_TYPE_MEM;
82 ebrp->ebr_index = EFX_MEM_BAR_RIVERHEAD;
83 ebrp->ebr_offset = 0;
84 ebrp->ebr_length = 0;
85 bar_found = B_TRUE;
86 break;
87 } else {
88 goto fail1;
89 }
90
91 }
92
93 xilinx_tbl_found = B_TRUE;
94
95 rc = epop->epo_find_mem_bar(espcp, xilinx_tbl_bar, &xil_eb);
96 if (rc != 0)
97 goto fail2;
98
99 rc = rhead_xilinx_cap_tbl_find_ef100_locator(&xil_eb,
100 xilinx_tbl_offset,
101 ebrp);
102 if (rc == 0) {
103 /* Found valid EF100 locator. */
104 bar_found = B_TRUE;
105 break;
106 } else if (rc != ENOENT) {
107 /* Table access failed, so terminate search. */
108 goto fail3;
109 }
110 }
111
112 if (bar_found == B_FALSE)
113 goto fail4;
114
115 rc = epop->epo_find_mem_bar(espcp, ebrp->ebr_index, &nic_eb);
116 if (rc != 0)
117 goto fail5;
118
119 EFSYS_BAR_READD(&nic_eb, ebrp->ebr_offset + ER_GZ_NIC_MAGIC_OFST,
120 &magic_ed, B_FALSE);
121
122 magic = EFX_DWORD_FIELD(magic_ed, ERF_GZ_NIC_MAGIC);
123 if (magic != EFE_GZ_NIC_MAGIC_EXPECTED) {
124 rc = EINVAL;
125 goto fail6;
126 }
127
128 return (0);
129
130 fail6:
131 EFSYS_PROBE(fail6);
132 fail5:
133 EFSYS_PROBE(fail5);
134 fail4:
135 EFSYS_PROBE(fail4);
136 fail3:
137 EFSYS_PROBE(fail3);
138 fail2:
139 EFSYS_PROBE(fail2);
140 fail1:
141 EFSYS_PROBE1(fail1, efx_rc_t, rc);
142
143 return (rc);
144 }
145
146 #endif /* EFSYS_OPT_RIVERHEAD && EFSYS_OPT_PCI */
147