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1/*
2 * GRU KERNEL MCS INSTRUCTIONS
3 *
4 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/kernel.h>
22#include "gru.h"
23#include "grulib.h"
24#include "grutables.h"
25
26/* 10 sec */
27#ifdef CONFIG_IA64
28#include <asm/processor.h>
29#define GRU_OPERATION_TIMEOUT (((cycles_t) local_cpu_data->itc_freq)*10)
30#define CLKS2NSEC(c) ((c) *1000000000 / local_cpu_data->itc_freq)
31#else
32#include <asm/tsc.h>
33#define GRU_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
34#define CLKS2NSEC(c) ((c) * 1000000 / tsc_khz)
35#endif
36
37/* Extract the status field from a kernel handle */
38#define GET_MSEG_HANDLE_STATUS(h) (((*(unsigned long *)(h)) >> 16) & 3)
39
40struct mcs_op_statistic mcs_op_statistics[mcsop_last];
41
42static void update_mcs_stats(enum mcs_op op, unsigned long clks)
43{
44 unsigned long nsec;
45
46 nsec = CLKS2NSEC(clks);
47 atomic_long_inc(&mcs_op_statistics[op].count);
48 atomic_long_add(nsec, &mcs_op_statistics[op].total);
49 if (mcs_op_statistics[op].max < nsec)
50 mcs_op_statistics[op].max = nsec;
51}
52
53static void start_instruction(void *h)
54{
55 unsigned long *w0 = h;
56
57 wmb(); /* setting CMD/STATUS bits must be last */
58 *w0 = *w0 | 0x20001;
59 gru_flush_cache(h);
60}
61
62static void report_instruction_timeout(void *h)
63{
64 unsigned long goff = GSEGPOFF((unsigned long)h);
65 char *id = "???";
66
67 if (TYPE_IS(CCH, goff))
68 id = "CCH";
69 else if (TYPE_IS(TGH, goff))
70 id = "TGH";
71 else if (TYPE_IS(TFH, goff))
72 id = "TFH";
73
74 panic(KERN_ALERT "GRU %p (%s) is malfunctioning\n", h, id);
75}
76
77static int wait_instruction_complete(void *h, enum mcs_op opc)
78{
79 int status;
80 unsigned long start_time = get_cycles();
81
82 while (1) {
83 cpu_relax();
84 status = GET_MSEG_HANDLE_STATUS(h);
85 if (status != CCHSTATUS_ACTIVE)
86 break;
87 if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time)) {
88 report_instruction_timeout(h);
89 start_time = get_cycles();
90 }
91 }
92 if (gru_options & OPT_STATS)
93 update_mcs_stats(opc, get_cycles() - start_time);
94 return status;
95}
96
97int cch_allocate(struct gru_context_configuration_handle *cch)
98{
99 int ret;
100
101 cch->opc = CCHOP_ALLOCATE;
102 start_instruction(cch);
103 ret = wait_instruction_complete(cch, cchop_allocate);
104
105 /*
106 * Stop speculation into the GSEG being mapped by the previous ALLOCATE.
107 * The GSEG memory does not exist until the ALLOCATE completes.
108 */
109 sync_core();
110 return ret;
111}
112
113int cch_start(struct gru_context_configuration_handle *cch)
114{
115 cch->opc = CCHOP_START;
116 start_instruction(cch);
117 return wait_instruction_complete(cch, cchop_start);
118}
119
120int cch_interrupt(struct gru_context_configuration_handle *cch)
121{
122 cch->opc = CCHOP_INTERRUPT;
123 start_instruction(cch);
124 return wait_instruction_complete(cch, cchop_interrupt);
125}
126
127int cch_deallocate(struct gru_context_configuration_handle *cch)
128{
129 int ret;
130
131 cch->opc = CCHOP_DEALLOCATE;
132 start_instruction(cch);
133 ret = wait_instruction_complete(cch, cchop_deallocate);
134
135 /*
136 * Stop speculation into the GSEG being unmapped by the previous
137 * DEALLOCATE.
138 */
139 sync_core();
140 return ret;
141}
142
143int cch_interrupt_sync(struct gru_context_configuration_handle
144 *cch)
145{
146 cch->opc = CCHOP_INTERRUPT_SYNC;
147 start_instruction(cch);
148 return wait_instruction_complete(cch, cchop_interrupt_sync);
149}
150
151int tgh_invalidate(struct gru_tlb_global_handle *tgh,
152 unsigned long vaddr, unsigned long vaddrmask,
153 int asid, int pagesize, int global, int n,
154 unsigned short ctxbitmap)
155{
156 tgh->vaddr = vaddr;
157 tgh->asid = asid;
158 tgh->pagesize = pagesize;
159 tgh->n = n;
160 tgh->global = global;
161 tgh->vaddrmask = vaddrmask;
162 tgh->ctxbitmap = ctxbitmap;
163 tgh->opc = TGHOP_TLBINV;
164 start_instruction(tgh);
165 return wait_instruction_complete(tgh, tghop_invalidate);
166}
167
168int tfh_write_only(struct gru_tlb_fault_handle *tfh,
169 unsigned long paddr, int gaa,
170 unsigned long vaddr, int asid, int dirty,
171 int pagesize)
172{
173 tfh->fillasid = asid;
174 tfh->fillvaddr = vaddr;
175 tfh->pfn = paddr >> GRU_PADDR_SHIFT;
176 tfh->gaa = gaa;
177 tfh->dirty = dirty;
178 tfh->pagesize = pagesize;
179 tfh->opc = TFHOP_WRITE_ONLY;
180 start_instruction(tfh);
181 return wait_instruction_complete(tfh, tfhop_write_only);
182}
183
184void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
185 unsigned long paddr, int gaa,
186 unsigned long vaddr, int asid, int dirty,
187 int pagesize)
188{
189 tfh->fillasid = asid;
190 tfh->fillvaddr = vaddr;
191 tfh->pfn = paddr >> GRU_PADDR_SHIFT;
192 tfh->gaa = gaa;
193 tfh->dirty = dirty;
194 tfh->pagesize = pagesize;
195 tfh->opc = TFHOP_WRITE_RESTART;
196 start_instruction(tfh);
197}
198
199void tfh_restart(struct gru_tlb_fault_handle *tfh)
200{
201 tfh->opc = TFHOP_RESTART;
202 start_instruction(tfh);
203}
204
205void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
206{
207 tfh->opc = TFHOP_USER_POLLING_MODE;
208 start_instruction(tfh);
209}
210
211void tfh_exception(struct gru_tlb_fault_handle *tfh)
212{
213 tfh->opc = TFHOP_EXCEPTION;
214 start_instruction(tfh);
215}
216
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * GRU KERNEL MCS INSTRUCTIONS
4 *
5 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
6 */
7
8#include <linux/kernel.h>
9#include "gru.h"
10#include "grulib.h"
11#include "grutables.h"
12
13/* 10 sec */
14#include <linux/sync_core.h>
15#include <asm/tsc.h>
16#define GRU_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
17#define CLKS2NSEC(c) ((c) * 1000000 / tsc_khz)
18
19/* Extract the status field from a kernel handle */
20#define GET_MSEG_HANDLE_STATUS(h) (((*(unsigned long *)(h)) >> 16) & 3)
21
22struct mcs_op_statistic mcs_op_statistics[mcsop_last];
23
24static void update_mcs_stats(enum mcs_op op, unsigned long clks)
25{
26 unsigned long nsec;
27
28 nsec = CLKS2NSEC(clks);
29 atomic_long_inc(&mcs_op_statistics[op].count);
30 atomic_long_add(nsec, &mcs_op_statistics[op].total);
31 if (mcs_op_statistics[op].max < nsec)
32 mcs_op_statistics[op].max = nsec;
33}
34
35static void start_instruction(void *h)
36{
37 unsigned long *w0 = h;
38
39 wmb(); /* setting CMD/STATUS bits must be last */
40 *w0 = *w0 | 0x20001;
41 gru_flush_cache(h);
42}
43
44static void report_instruction_timeout(void *h)
45{
46 unsigned long goff = GSEGPOFF((unsigned long)h);
47 char *id = "???";
48
49 if (TYPE_IS(CCH, goff))
50 id = "CCH";
51 else if (TYPE_IS(TGH, goff))
52 id = "TGH";
53 else if (TYPE_IS(TFH, goff))
54 id = "TFH";
55
56 panic(KERN_ALERT "GRU %p (%s) is malfunctioning\n", h, id);
57}
58
59static int wait_instruction_complete(void *h, enum mcs_op opc)
60{
61 int status;
62 unsigned long start_time = get_cycles();
63
64 while (1) {
65 cpu_relax();
66 status = GET_MSEG_HANDLE_STATUS(h);
67 if (status != CCHSTATUS_ACTIVE)
68 break;
69 if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time)) {
70 report_instruction_timeout(h);
71 start_time = get_cycles();
72 }
73 }
74 if (gru_options & OPT_STATS)
75 update_mcs_stats(opc, get_cycles() - start_time);
76 return status;
77}
78
79int cch_allocate(struct gru_context_configuration_handle *cch)
80{
81 int ret;
82
83 cch->opc = CCHOP_ALLOCATE;
84 start_instruction(cch);
85 ret = wait_instruction_complete(cch, cchop_allocate);
86
87 /*
88 * Stop speculation into the GSEG being mapped by the previous ALLOCATE.
89 * The GSEG memory does not exist until the ALLOCATE completes.
90 */
91 sync_core();
92 return ret;
93}
94
95int cch_start(struct gru_context_configuration_handle *cch)
96{
97 cch->opc = CCHOP_START;
98 start_instruction(cch);
99 return wait_instruction_complete(cch, cchop_start);
100}
101
102int cch_interrupt(struct gru_context_configuration_handle *cch)
103{
104 cch->opc = CCHOP_INTERRUPT;
105 start_instruction(cch);
106 return wait_instruction_complete(cch, cchop_interrupt);
107}
108
109int cch_deallocate(struct gru_context_configuration_handle *cch)
110{
111 int ret;
112
113 cch->opc = CCHOP_DEALLOCATE;
114 start_instruction(cch);
115 ret = wait_instruction_complete(cch, cchop_deallocate);
116
117 /*
118 * Stop speculation into the GSEG being unmapped by the previous
119 * DEALLOCATE.
120 */
121 sync_core();
122 return ret;
123}
124
125int cch_interrupt_sync(struct gru_context_configuration_handle
126 *cch)
127{
128 cch->opc = CCHOP_INTERRUPT_SYNC;
129 start_instruction(cch);
130 return wait_instruction_complete(cch, cchop_interrupt_sync);
131}
132
133int tgh_invalidate(struct gru_tlb_global_handle *tgh,
134 unsigned long vaddr, unsigned long vaddrmask,
135 int asid, int pagesize, int global, int n,
136 unsigned short ctxbitmap)
137{
138 tgh->vaddr = vaddr;
139 tgh->asid = asid;
140 tgh->pagesize = pagesize;
141 tgh->n = n;
142 tgh->global = global;
143 tgh->vaddrmask = vaddrmask;
144 tgh->ctxbitmap = ctxbitmap;
145 tgh->opc = TGHOP_TLBINV;
146 start_instruction(tgh);
147 return wait_instruction_complete(tgh, tghop_invalidate);
148}
149
150int tfh_write_only(struct gru_tlb_fault_handle *tfh,
151 unsigned long paddr, int gaa,
152 unsigned long vaddr, int asid, int dirty,
153 int pagesize)
154{
155 tfh->fillasid = asid;
156 tfh->fillvaddr = vaddr;
157 tfh->pfn = paddr >> GRU_PADDR_SHIFT;
158 tfh->gaa = gaa;
159 tfh->dirty = dirty;
160 tfh->pagesize = pagesize;
161 tfh->opc = TFHOP_WRITE_ONLY;
162 start_instruction(tfh);
163 return wait_instruction_complete(tfh, tfhop_write_only);
164}
165
166void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
167 unsigned long paddr, int gaa,
168 unsigned long vaddr, int asid, int dirty,
169 int pagesize)
170{
171 tfh->fillasid = asid;
172 tfh->fillvaddr = vaddr;
173 tfh->pfn = paddr >> GRU_PADDR_SHIFT;
174 tfh->gaa = gaa;
175 tfh->dirty = dirty;
176 tfh->pagesize = pagesize;
177 tfh->opc = TFHOP_WRITE_RESTART;
178 start_instruction(tfh);
179}
180
181void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
182{
183 tfh->opc = TFHOP_USER_POLLING_MODE;
184 start_instruction(tfh);
185}
186
187void tfh_exception(struct gru_tlb_fault_handle *tfh)
188{
189 tfh->opc = TFHOP_EXCEPTION;
190 start_instruction(tfh);
191}
192