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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9cc9b056 JS |
2 | /* |
3 | * SN Platform GRU Driver | |
4 | * | |
5 | * Dump GRU State | |
6 | * | |
8820f27a | 7 | * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. |
9cc9b056 JS |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/uaccess.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/bitops.h> | |
16 | #include <asm/uv/uv_hub.h> | |
fee05f45 GS |
17 | |
18 | #include <linux/nospec.h> | |
19 | ||
9cc9b056 JS |
20 | #include "gru.h" |
21 | #include "grutables.h" | |
22 | #include "gruhandles.h" | |
23 | #include "grulib.h" | |
24 | ||
25 | #define CCH_LOCK_ATTEMPTS 10 | |
26 | ||
27 | static int gru_user_copy_handle(void __user **dp, void *s) | |
28 | { | |
2b702b28 | 29 | if (copy_to_user(*dp, s, GRU_HANDLE_BYTES)) |
9cc9b056 JS |
30 | return -1; |
31 | *dp += GRU_HANDLE_BYTES; | |
32 | return 0; | |
33 | } | |
34 | ||
35 | static int gru_dump_context_data(void *grubase, | |
36 | struct gru_context_configuration_handle *cch, | |
b8229bed JS |
37 | void __user *ubuf, int ctxnum, int dsrcnt, |
38 | int flush_cbrs) | |
9cc9b056 JS |
39 | { |
40 | void *cb, *cbe, *tfh, *gseg; | |
41 | int i, scr; | |
42 | ||
43 | gseg = grubase + ctxnum * GRU_GSEG_STRIDE; | |
44 | cb = gseg + GRU_CB_BASE; | |
45 | cbe = grubase + GRU_CBE_BASE; | |
46 | tfh = grubase + GRU_TFH_BASE; | |
47 | ||
48 | for_each_cbr_in_allocation_map(i, &cch->cbr_allocation_map, scr) { | |
b8229bed JS |
49 | if (flush_cbrs) |
50 | gru_flush_cache(cb); | |
9cc9b056 JS |
51 | if (gru_user_copy_handle(&ubuf, cb)) |
52 | goto fail; | |
53 | if (gru_user_copy_handle(&ubuf, tfh + i * GRU_HANDLE_STRIDE)) | |
54 | goto fail; | |
55 | if (gru_user_copy_handle(&ubuf, cbe + i * GRU_HANDLE_STRIDE)) | |
56 | goto fail; | |
57 | cb += GRU_HANDLE_STRIDE; | |
58 | } | |
59 | if (dsrcnt) | |
60 | memcpy(ubuf, gseg + GRU_DS_BASE, dsrcnt * GRU_HANDLE_STRIDE); | |
61 | return 0; | |
62 | ||
63 | fail: | |
64 | return -EFAULT; | |
65 | } | |
66 | ||
67 | static int gru_dump_tfm(struct gru_state *gru, | |
68 | void __user *ubuf, void __user *ubufend) | |
69 | { | |
70 | struct gru_tlb_fault_map *tfm; | |
a010d276 | 71 | int i; |
9cc9b056 | 72 | |
a010d276 SM |
73 | if (GRU_NUM_TFM * GRU_CACHE_LINE_BYTES > ubufend - ubuf) |
74 | return -EFBIG; | |
9cc9b056 JS |
75 | |
76 | for (i = 0; i < GRU_NUM_TFM; i++) { | |
77 | tfm = get_tfm(gru->gs_gru_base_vaddr, i); | |
78 | if (gru_user_copy_handle(&ubuf, tfm)) | |
79 | goto fail; | |
80 | } | |
81 | return GRU_NUM_TFM * GRU_CACHE_LINE_BYTES; | |
82 | ||
83 | fail: | |
84 | return -EFAULT; | |
85 | } | |
86 | ||
87 | static int gru_dump_tgh(struct gru_state *gru, | |
88 | void __user *ubuf, void __user *ubufend) | |
89 | { | |
90 | struct gru_tlb_global_handle *tgh; | |
a010d276 | 91 | int i; |
9cc9b056 | 92 | |
a010d276 SM |
93 | if (GRU_NUM_TGH * GRU_CACHE_LINE_BYTES > ubufend - ubuf) |
94 | return -EFBIG; | |
9cc9b056 JS |
95 | |
96 | for (i = 0; i < GRU_NUM_TGH; i++) { | |
97 | tgh = get_tgh(gru->gs_gru_base_vaddr, i); | |
98 | if (gru_user_copy_handle(&ubuf, tgh)) | |
99 | goto fail; | |
100 | } | |
101 | return GRU_NUM_TGH * GRU_CACHE_LINE_BYTES; | |
102 | ||
103 | fail: | |
104 | return -EFAULT; | |
105 | } | |
106 | ||
107 | static int gru_dump_context(struct gru_state *gru, int ctxnum, | |
108 | void __user *ubuf, void __user *ubufend, char data_opt, | |
b8229bed | 109 | char lock_cch, char flush_cbrs) |
9cc9b056 JS |
110 | { |
111 | struct gru_dump_context_header hdr; | |
112 | struct gru_dump_context_header __user *uhdr = ubuf; | |
2b702b28 | 113 | struct gru_context_configuration_handle *cch, *ubufcch; |
9cc9b056 JS |
114 | struct gru_thread_state *gts; |
115 | int try, cch_locked, cbrcnt = 0, dsrcnt = 0, bytes = 0, ret = 0; | |
116 | void *grubase; | |
117 | ||
118 | memset(&hdr, 0, sizeof(hdr)); | |
119 | grubase = gru->gs_gru_base_vaddr; | |
120 | cch = get_cch(grubase, ctxnum); | |
121 | for (try = 0; try < CCH_LOCK_ATTEMPTS; try++) { | |
122 | cch_locked = trylock_cch_handle(cch); | |
123 | if (cch_locked) | |
124 | break; | |
125 | msleep(1); | |
126 | } | |
127 | ||
128 | ubuf += sizeof(hdr); | |
2b702b28 | 129 | ubufcch = ubuf; |
49d3d6c3 DC |
130 | if (gru_user_copy_handle(&ubuf, cch)) { |
131 | if (cch_locked) | |
132 | unlock_cch_handle(cch); | |
133 | return -EFAULT; | |
134 | } | |
2b702b28 JS |
135 | if (cch_locked) |
136 | ubufcch->delresp = 0; | |
9cc9b056 JS |
137 | bytes = sizeof(hdr) + GRU_CACHE_LINE_BYTES; |
138 | ||
139 | if (cch_locked || !lock_cch) { | |
140 | gts = gru->gs_gts[ctxnum]; | |
836ce679 | 141 | if (gts && gts->ts_vma) { |
9cc9b056 JS |
142 | hdr.pid = gts->ts_tgid_owner; |
143 | hdr.vaddr = gts->ts_vma->vm_start; | |
144 | } | |
145 | if (cch->state != CCHSTATE_INACTIVE) { | |
146 | cbrcnt = hweight64(cch->cbr_allocation_map) * | |
147 | GRU_CBR_AU_SIZE; | |
148 | dsrcnt = data_opt ? hweight32(cch->dsr_allocation_map) * | |
149 | GRU_DSR_AU_CL : 0; | |
150 | } | |
151 | bytes += (3 * cbrcnt + dsrcnt) * GRU_CACHE_LINE_BYTES; | |
152 | if (bytes > ubufend - ubuf) | |
153 | ret = -EFBIG; | |
154 | else | |
155 | ret = gru_dump_context_data(grubase, cch, ubuf, ctxnum, | |
b8229bed | 156 | dsrcnt, flush_cbrs); |
9cc9b056 JS |
157 | } |
158 | if (cch_locked) | |
159 | unlock_cch_handle(cch); | |
160 | if (ret) | |
161 | return ret; | |
162 | ||
163 | hdr.magic = GRU_DUMP_MAGIC; | |
2b702b28 | 164 | hdr.gid = gru->gs_gid; |
9cc9b056 JS |
165 | hdr.ctxnum = ctxnum; |
166 | hdr.cbrcnt = cbrcnt; | |
167 | hdr.dsrcnt = dsrcnt; | |
168 | hdr.cch_locked = cch_locked; | |
b6a83d92 DC |
169 | if (copy_to_user(uhdr, &hdr, sizeof(hdr))) |
170 | return -EFAULT; | |
9cc9b056 | 171 | |
b6a83d92 | 172 | return bytes; |
9cc9b056 JS |
173 | } |
174 | ||
175 | int gru_dump_chiplet_request(unsigned long arg) | |
176 | { | |
177 | struct gru_state *gru; | |
178 | struct gru_dump_chiplet_state_req req; | |
179 | void __user *ubuf; | |
180 | void __user *ubufend; | |
181 | int ctxnum, ret, cnt = 0; | |
182 | ||
183 | if (copy_from_user(&req, (void __user *)arg, sizeof(req))) | |
184 | return -EFAULT; | |
185 | ||
186 | /* Currently, only dump by gid is implemented */ | |
c2ed545c | 187 | if (req.gid >= gru_max_gids) |
9cc9b056 | 188 | return -EINVAL; |
fee05f45 | 189 | req.gid = array_index_nospec(req.gid, gru_max_gids); |
9cc9b056 JS |
190 | |
191 | gru = GID_TO_GRU(req.gid); | |
192 | ubuf = req.buf; | |
193 | ubufend = req.buf + req.buflen; | |
194 | ||
195 | ret = gru_dump_tfm(gru, ubuf, ubufend); | |
196 | if (ret < 0) | |
197 | goto fail; | |
198 | ubuf += ret; | |
199 | ||
200 | ret = gru_dump_tgh(gru, ubuf, ubufend); | |
201 | if (ret < 0) | |
202 | goto fail; | |
203 | ubuf += ret; | |
204 | ||
205 | for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) { | |
206 | if (req.ctxnum == ctxnum || req.ctxnum < 0) { | |
207 | ret = gru_dump_context(gru, ctxnum, ubuf, ubufend, | |
b8229bed JS |
208 | req.data_opt, req.lock_cch, |
209 | req.flush_cbrs); | |
9cc9b056 JS |
210 | if (ret < 0) |
211 | goto fail; | |
212 | ubuf += ret; | |
213 | cnt++; | |
214 | } | |
215 | } | |
216 | ||
217 | if (copy_to_user((void __user *)arg, &req, sizeof(req))) | |
218 | return -EFAULT; | |
219 | return cnt; | |
220 | ||
221 | fail: | |
222 | return ret; | |
223 | } |