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-rw-r--r--drivers/misc/sgi-gru/gruhandles.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/gruhandles.c b/drivers/misc/sgi-gru/gruhandles.c
new file mode 100644
index 000000000000..9b7ccb328697
--- /dev/null
+++ b/drivers/misc/sgi-gru/gruhandles.c
@@ -0,0 +1,183 @@
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#else
31#include <asm/tsc.h>
32#define GRU_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
33#endif
34
35/* Extract the status field from a kernel handle */
36#define GET_MSEG_HANDLE_STATUS(h) (((*(unsigned long *)(h)) >> 16) & 3)
37
38struct mcs_op_statistic mcs_op_statistics[mcsop_last];
39
40static void update_mcs_stats(enum mcs_op op, unsigned long clks)
41{
42 atomic_long_inc(&mcs_op_statistics[op].count);
43 atomic_long_add(clks, &mcs_op_statistics[op].total);
44 if (mcs_op_statistics[op].max < clks)
45 mcs_op_statistics[op].max = clks;
46}
47
48static void start_instruction(void *h)
49{
50 unsigned long *w0 = h;
51
52 wmb(); /* setting CMD bit must be last */
53 *w0 = *w0 | 1;
54 gru_flush_cache(h);
55}
56
57static int wait_instruction_complete(void *h, enum mcs_op opc)
58{
59 int status;
60 cycles_t start_time = get_cycles();
61
62 while (1) {
63 cpu_relax();
64 status = GET_MSEG_HANDLE_STATUS(h);
65 if (status != CCHSTATUS_ACTIVE)
66 break;
67 if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time))
68 panic("GRU %p is malfunctioning\n", h);
69 }
70 if (gru_options & OPT_STATS)
71 update_mcs_stats(opc, get_cycles() - start_time);
72 return status;
73}
74
75int cch_allocate(struct gru_context_configuration_handle *cch,
76 int asidval, int sizeavail, unsigned long cbrmap,
77 unsigned long dsrmap)
78{
79 int i;
80
81 for (i = 0; i < 8; i++) {
82 cch->asid[i] = (asidval++);
83 cch->sizeavail[i] = sizeavail;
84 }
85 cch->dsr_allocation_map = dsrmap;
86 cch->cbr_allocation_map = cbrmap;
87 cch->opc = CCHOP_ALLOCATE;
88 start_instruction(cch);
89 return wait_instruction_complete(cch, cchop_allocate);
90}
91
92int cch_start(struct gru_context_configuration_handle *cch)
93{
94 cch->opc = CCHOP_START;
95 start_instruction(cch);
96 return wait_instruction_complete(cch, cchop_start);
97}
98
99int cch_interrupt(struct gru_context_configuration_handle *cch)
100{
101 cch->opc = CCHOP_INTERRUPT;
102 start_instruction(cch);
103 return wait_instruction_complete(cch, cchop_interrupt);
104}
105
106int cch_deallocate(struct gru_context_configuration_handle *cch)
107{
108 cch->opc = CCHOP_DEALLOCATE;
109 start_instruction(cch);
110 return wait_instruction_complete(cch, cchop_deallocate);
111}
112
113int cch_interrupt_sync(struct gru_context_configuration_handle
114 *cch)
115{
116 cch->opc = CCHOP_INTERRUPT_SYNC;
117 start_instruction(cch);
118 return wait_instruction_complete(cch, cchop_interrupt_sync);
119}
120
121int tgh_invalidate(struct gru_tlb_global_handle *tgh,
122 unsigned long vaddr, unsigned long vaddrmask,
123 int asid, int pagesize, int global, int n,
124 unsigned short ctxbitmap)
125{
126 tgh->vaddr = vaddr;
127 tgh->asid = asid;
128 tgh->pagesize = pagesize;
129 tgh->n = n;
130 tgh->global = global;
131 tgh->vaddrmask = vaddrmask;
132 tgh->ctxbitmap = ctxbitmap;
133 tgh->opc = TGHOP_TLBINV;
134 start_instruction(tgh);
135 return wait_instruction_complete(tgh, tghop_invalidate);
136}
137
138void tfh_write_only(struct gru_tlb_fault_handle *tfh,
139 unsigned long pfn, unsigned long vaddr,
140 int asid, int dirty, int pagesize)
141{
142 tfh->fillasid = asid;
143 tfh->fillvaddr = vaddr;
144 tfh->pfn = pfn;
145 tfh->dirty = dirty;
146 tfh->pagesize = pagesize;
147 tfh->opc = TFHOP_WRITE_ONLY;
148 start_instruction(tfh);
149}
150
151void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
152 unsigned long paddr, int gaa,
153 unsigned long vaddr, int asid, int dirty,
154 int pagesize)
155{
156 tfh->fillasid = asid;
157 tfh->fillvaddr = vaddr;
158 tfh->pfn = paddr >> GRU_PADDR_SHIFT;
159 tfh->gaa = gaa;
160 tfh->dirty = dirty;
161 tfh->pagesize = pagesize;
162 tfh->opc = TFHOP_WRITE_RESTART;
163 start_instruction(tfh);
164}
165
166void tfh_restart(struct gru_tlb_fault_handle *tfh)
167{
168 tfh->opc = TFHOP_RESTART;
169 start_instruction(tfh);
170}
171
172void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
173{
174 tfh->opc = TFHOP_USER_POLLING_MODE;
175 start_instruction(tfh);
176}
177
178void tfh_exception(struct gru_tlb_fault_handle *tfh)
179{
180 tfh->opc = TFHOP_EXCEPTION;
181 start_instruction(tfh);
182}
183
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