1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/import/chips/p9/procedures/hwp/memory/lib/workarounds/mcbist_workarounds.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2016,2017 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
///
/// @file mcbist_workarounds.C
/// @brief Workarounds for the MCBISt engine
/// Workarounds are very deivce specific, so there is no attempt to generalize
/// this code in any way.
///
// *HWP HWP Owner: Brian Silver <bsilver@us.ibm.com>
// *HWP HWP Backup: Steven Glancy <sglancy@usi.ibm.com>
// *HWP Team: Memory
// *HWP Level: 2
// *HWP Consumed by: FSP:HB
#include <fapi2.H>
#include <p9_mc_scom_addresses.H>
#include <p9_mc_scom_addresses_fld.H>
#include <lib/mss_attribute_accessors.H>
#include <generic/memory/lib/utils/scom.H>
#include <generic/memory/lib/utils/pos.H>
#include <lib/dimm/kind.H>
#include <lib/workarounds/mcbist_workarounds.H>
#include <lib/mcbist/mcbist.H>
#include <lib/fir/fir.H>
using fapi2::TARGET_TYPE_MCBIST;
using fapi2::TARGET_TYPE_DIMM;
using fapi2::FAPI2_RC_SUCCESS;
namespace mss
{
namespace workarounds
{
namespace mcbist
{
///
/// @brief Replace reads with displays in the passed in MCBIST program
/// @param[in,out] the MCBIST program to check for read/display replacement
/// @note Useful for testing
///
void replace_read_helper(mss::mcbist::program<TARGET_TYPE_MCBIST>& io_program)
{
using TT = mss::mcbistTraits<TARGET_TYPE_MCBIST>;
io_program.change_maint_broadcast_mode(mss::OFF);
io_program.change_end_boundary(mss::mcbist::end_boundary::STOP_AFTER_ADDRESS);
for (auto& st : io_program.iv_subtests)
{
uint64_t l_op = 0;
st.iv_mcbmr.extractToRight<TT::OP_TYPE, TT::OP_TYPE_LEN>(l_op);
if (l_op == mss::mcbist::op_type::READ)
{
l_op = mss::mcbist::op_type::DISPLAY;
}
st.iv_mcbmr.insertFromRight<TT::OP_TYPE, TT::OP_TYPE_LEN>(l_op);
}
}
///
/// @brief End of rank work around
/// For Nimbus DD1 the MCBIST engine doesn't detect the end of rank properly
/// for a 1R DIMM during a super-fast read. To work around this, we check the
/// MCBIST to see if any port has a 1R DIMM on it and if so we change our stop
/// conditions to immediate. However, because that doesn't work (by design) with
/// read, we also must change all reads to displays (slow read.)
/// @param[in] i_target the fapi2 target of the mcbist
/// @param[in,out] io_program the mcbist program to check
/// @return fapi2::ReturnCode FAPI2_RC_SUCCESS if ok
///
fapi2::ReturnCode end_of_rank( const fapi2::Target<TARGET_TYPE_MCBIST>& i_target,
mss::mcbist::program<TARGET_TYPE_MCBIST>& io_program )
{
using TT = mss::mcbistTraits<TARGET_TYPE_MCBIST>;
// If we don't need the mcbist work-around, we're done.
if (! mss::chip_ec_feature_mcbist_end_of_rank(i_target) )
{
return FAPI2_RC_SUCCESS;
}
// First things first - lets find out if we have an 1R DIMM on our side of the chip.
const auto l_dimm_kinds = dimm::kind::vector( mss::find_targets<TARGET_TYPE_DIMM>(i_target) );
const auto l_kind = std::find_if(l_dimm_kinds.begin(), l_dimm_kinds.end(), [](const dimm::kind & k) -> bool
{
// If total ranks are 1, we have a 1R DIMM, SDP. This is the fellow of concern
return k.iv_total_ranks == 1;
});
// If we don't find the fellow of concern, we can get outta here
if (l_kind == l_dimm_kinds.end())
{
FAPI_INF("no 1R SDP DIMM on this MCBIST (%s), we're ok", mss::c_str(i_target));
return FAPI2_RC_SUCCESS;
}
// Keep in mind that pause-on-error-mode is two bits and it doesn't encode master/slave. The
// end_boundary enums are constructed such that STOP_AFTER_MASTER_RANK is really stop on
// either master or slave for the purposes of this field. So, checking stop-after-master-rank
// will catch both master and slave pauses which is correct for this work-around.
uint64_t l_pause_mode = 0;
io_program.iv_config.extractToRight<TT::CFG_PAUSE_ON_ERROR_MODE, TT::CFG_PAUSE_ON_ERROR_MODE_LEN>(l_pause_mode);
if( l_pause_mode != mss::mcbist::end_boundary::STOP_AFTER_MASTER_RANK )
{
FAPI_INF("not checking rank boundaries on this MCBIST (%s), we're ok", mss::c_str(i_target));
return FAPI2_RC_SUCCESS;
}
// If we're here, we need to fix up our program. We need to set our stop to stop immediate, which implies
// we don't do broadcasts and we can't do read, we have to do display.
replace_read_helper(io_program);
return fapi2::FAPI2_RC_SUCCESS;
}
///
/// @brief WAT debug attention
/// For Nimbus DD1 the MCBIST engine uses the WAT debug bit as a workaround
/// @param[in] i_target the fapi2 target of the mcbist
/// @return fapi2::ReturnCode FAPI2_RC_SUCCESS if ok
///
fapi2::ReturnCode wat_debug_attention( const fapi2::Target<fapi2::TARGET_TYPE_MCBIST>& i_target )
{
// MCBIST attentions are already special attention
if (mss::chip_ec_feature_mss_wat_debug_attn(i_target))
{
fapi2::ReturnCode l_rc;
fir::reg<MCBIST_MCBISTFIRQ> mcbist_fir_register(i_target, l_rc);
FAPI_TRY(l_rc, "unable to create fir::reg for %d", MCBIST_MCBISTFIRQ);
FAPI_TRY(mcbist_fir_register.attention<MCBIST_MCBISTFIRQ_WAT_DEBUG_ATTN>().write());
}
return fapi2::FAPI2_RC_SUCCESS;
fapi_try_exit:
return fapi2::current_err;
}
} // close namespace mcbist
} // close namespace workarounds
} // close namespace mss
|
