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ae4de14c AK |
1 | /* |
2 | * QEMU sPAPR Dynamic DMA windows support | |
3 | * | |
4 | * Copyright (c) 2015 Alexey Kardashevskiy, IBM Corporation. | |
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, | |
9 | * or (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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include "qemu/osdep.h" | |
ae4de14c | 21 | #include "qemu/error-report.h" |
0b8fa32f | 22 | #include "qemu/module.h" |
ae4de14c AK |
23 | #include "hw/ppc/spapr.h" |
24 | #include "hw/pci-host/spapr.h" | |
25 | #include "trace.h" | |
26 | ||
27 | static int spapr_phb_get_active_win_num_cb(Object *child, void *opaque) | |
28 | { | |
ce2918cb | 29 | SpaprTceTable *tcet; |
ae4de14c | 30 | |
ce2918cb | 31 | tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); |
ae4de14c AK |
32 | if (tcet && tcet->nb_table) { |
33 | ++*(unsigned *)opaque; | |
34 | } | |
35 | return 0; | |
36 | } | |
37 | ||
ce2918cb | 38 | static unsigned spapr_phb_get_active_win_num(SpaprPhbState *sphb) |
ae4de14c AK |
39 | { |
40 | unsigned ret = 0; | |
41 | ||
42 | object_child_foreach(OBJECT(sphb), spapr_phb_get_active_win_num_cb, &ret); | |
43 | ||
44 | return ret; | |
45 | } | |
46 | ||
47 | static int spapr_phb_get_free_liobn_cb(Object *child, void *opaque) | |
48 | { | |
ce2918cb | 49 | SpaprTceTable *tcet; |
ae4de14c | 50 | |
ce2918cb | 51 | tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); |
ae4de14c AK |
52 | if (tcet && !tcet->nb_table) { |
53 | *(uint32_t *)opaque = tcet->liobn; | |
54 | return 1; | |
55 | } | |
56 | return 0; | |
57 | } | |
58 | ||
ce2918cb | 59 | static unsigned spapr_phb_get_free_liobn(SpaprPhbState *sphb) |
ae4de14c AK |
60 | { |
61 | uint32_t liobn = 0; | |
62 | ||
63 | object_child_foreach(OBJECT(sphb), spapr_phb_get_free_liobn_cb, &liobn); | |
64 | ||
65 | return liobn; | |
66 | } | |
67 | ||
68 | static uint32_t spapr_page_mask_to_query_mask(uint64_t page_mask) | |
69 | { | |
70 | int i; | |
71 | uint32_t mask = 0; | |
72 | const struct { int shift; uint32_t mask; } masks[] = { | |
73 | { 12, RTAS_DDW_PGSIZE_4K }, | |
74 | { 16, RTAS_DDW_PGSIZE_64K }, | |
4c7daca3 | 75 | { 21, RTAS_DDW_PGSIZE_2M }, |
ae4de14c AK |
76 | { 24, RTAS_DDW_PGSIZE_16M }, |
77 | { 25, RTAS_DDW_PGSIZE_32M }, | |
78 | { 26, RTAS_DDW_PGSIZE_64M }, | |
79 | { 27, RTAS_DDW_PGSIZE_128M }, | |
80 | { 28, RTAS_DDW_PGSIZE_256M }, | |
81 | { 34, RTAS_DDW_PGSIZE_16G }, | |
82 | }; | |
83 | ||
84 | for (i = 0; i < ARRAY_SIZE(masks); ++i) { | |
85 | if (page_mask & (1ULL << masks[i].shift)) { | |
86 | mask |= masks[i].mask; | |
87 | } | |
88 | } | |
89 | ||
90 | return mask; | |
91 | } | |
92 | ||
93 | static void rtas_ibm_query_pe_dma_window(PowerPCCPU *cpu, | |
ce2918cb | 94 | SpaprMachineState *spapr, |
ae4de14c AK |
95 | uint32_t token, uint32_t nargs, |
96 | target_ulong args, | |
97 | uint32_t nret, target_ulong rets) | |
98 | { | |
ce2918cb | 99 | SpaprPhbState *sphb; |
8994e91e | 100 | uint64_t buid; |
ae4de14c | 101 | uint32_t avail, addr, pgmask = 0; |
ae4de14c | 102 | |
c0e765da | 103 | if ((nargs != 3) || ((nret != 5) && (nret != 6))) { |
ae4de14c AK |
104 | goto param_error_exit; |
105 | } | |
106 | ||
107 | buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); | |
108 | addr = rtas_ld(args, 0); | |
109 | sphb = spapr_pci_find_phb(spapr, buid); | |
110 | if (!sphb || !sphb->ddw_enabled) { | |
111 | goto param_error_exit; | |
112 | } | |
113 | ||
114 | /* Translate page mask to LoPAPR format */ | |
115 | pgmask = spapr_page_mask_to_query_mask(sphb->page_size_mask); | |
116 | ||
ae4de14c AK |
117 | avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb); |
118 | ||
119 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); | |
120 | rtas_st(rets, 1, avail); | |
c0e765da AK |
121 | if (nret == 6) { |
122 | /* | |
123 | * Set the Max TCE number as 1<<(58-21) = 0x20.0000.0000 | |
124 | * 1<<59 is the huge window start and 21 is 2M page shift. | |
125 | */ | |
126 | rtas_st(rets, 2, 0x00000020); | |
127 | rtas_st(rets, 3, 0x00000000); | |
128 | rtas_st(rets, 4, pgmask); | |
129 | rtas_st(rets, 5, 0); /* DMA migration mask, not supported */ | |
130 | } else { | |
131 | rtas_st(rets, 2, 0x80000000); | |
132 | rtas_st(rets, 3, pgmask); | |
133 | rtas_st(rets, 4, 0); /* DMA migration mask, not supported */ | |
134 | } | |
ae4de14c | 135 | |
8994e91e | 136 | trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask); |
ae4de14c AK |
137 | return; |
138 | ||
139 | param_error_exit: | |
140 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); | |
141 | } | |
142 | ||
143 | static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu, | |
ce2918cb | 144 | SpaprMachineState *spapr, |
ae4de14c AK |
145 | uint32_t token, uint32_t nargs, |
146 | target_ulong args, | |
147 | uint32_t nret, target_ulong rets) | |
148 | { | |
ce2918cb DG |
149 | SpaprPhbState *sphb; |
150 | SpaprTceTable *tcet = NULL; | |
ae4de14c AK |
151 | uint32_t addr, page_shift, window_shift, liobn; |
152 | uint64_t buid, win_addr; | |
153 | int windows; | |
154 | ||
155 | if ((nargs != 5) || (nret != 4)) { | |
156 | goto param_error_exit; | |
157 | } | |
158 | ||
159 | buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); | |
160 | addr = rtas_ld(args, 0); | |
161 | sphb = spapr_pci_find_phb(spapr, buid); | |
162 | if (!sphb || !sphb->ddw_enabled) { | |
163 | goto param_error_exit; | |
164 | } | |
165 | ||
166 | page_shift = rtas_ld(args, 3); | |
167 | window_shift = rtas_ld(args, 4); | |
168 | liobn = spapr_phb_get_free_liobn(sphb); | |
169 | windows = spapr_phb_get_active_win_num(sphb); | |
170 | ||
171 | if (!(sphb->page_size_mask & (1ULL << page_shift)) || | |
172 | (window_shift < page_shift)) { | |
173 | goto param_error_exit; | |
174 | } | |
175 | ||
176 | if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) { | |
177 | goto hw_error_exit; | |
178 | } | |
179 | ||
180 | tcet = spapr_tce_find_by_liobn(liobn); | |
181 | if (!tcet) { | |
182 | goto hw_error_exit; | |
183 | } | |
184 | ||
185 | win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr; | |
5f366667 AK |
186 | /* |
187 | * We have just created a window, we know for the fact that it is empty, | |
188 | * use a hack to avoid iterating over the table as it is quite possible | |
189 | * to have billions of TCEs, all empty. | |
190 | * Note that we cannot delay this to the first H_PUT_TCE as this hcall is | |
191 | * mostly likely to be handled in KVM so QEMU just does not know if it | |
192 | * happened. | |
193 | */ | |
194 | tcet->skipping_replay = true; | |
ae4de14c AK |
195 | spapr_tce_table_enable(tcet, page_shift, win_addr, |
196 | 1ULL << (window_shift - page_shift)); | |
5f366667 | 197 | tcet->skipping_replay = false; |
ae4de14c AK |
198 | if (!tcet->nb_table) { |
199 | goto hw_error_exit; | |
200 | } | |
201 | ||
202 | trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift, | |
203 | 1ULL << window_shift, tcet->bus_offset, liobn); | |
204 | ||
205 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); | |
206 | rtas_st(rets, 1, liobn); | |
207 | rtas_st(rets, 2, tcet->bus_offset >> 32); | |
208 | rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1)); | |
209 | ||
210 | return; | |
211 | ||
212 | hw_error_exit: | |
213 | rtas_st(rets, 0, RTAS_OUT_HW_ERROR); | |
214 | return; | |
215 | ||
216 | param_error_exit: | |
217 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); | |
218 | } | |
219 | ||
220 | static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu, | |
ce2918cb | 221 | SpaprMachineState *spapr, |
ae4de14c AK |
222 | uint32_t token, uint32_t nargs, |
223 | target_ulong args, | |
224 | uint32_t nret, target_ulong rets) | |
225 | { | |
ce2918cb DG |
226 | SpaprPhbState *sphb; |
227 | SpaprTceTable *tcet; | |
ae4de14c | 228 | uint32_t liobn; |
31cc81f7 | 229 | bool def_win_removed; |
ae4de14c AK |
230 | |
231 | if ((nargs != 1) || (nret != 1)) { | |
232 | goto param_error_exit; | |
233 | } | |
234 | ||
235 | liobn = rtas_ld(args, 0); | |
236 | tcet = spapr_tce_find_by_liobn(liobn); | |
237 | if (!tcet) { | |
238 | goto param_error_exit; | |
239 | } | |
240 | ||
241 | sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent); | |
242 | if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) { | |
243 | goto param_error_exit; | |
244 | } | |
245 | ||
31cc81f7 | 246 | def_win_removed = tcet->def_win; |
ae4de14c AK |
247 | spapr_tce_table_disable(tcet); |
248 | trace_spapr_iommu_ddw_remove(liobn); | |
249 | ||
31cc81f7 AK |
250 | /* |
251 | * PAPR+/LoPAPR says: | |
252 | * The platform must restore the default DMA window for the PE on a call | |
253 | * to the ibm,remove-pe-dma-window RTAS call when all of the following | |
254 | * are true: | |
255 | * a. The call removes the last DMA window remaining for the PE. | |
256 | * b. The DMA window being removed is not the default window | |
257 | */ | |
258 | if (spapr_phb_get_active_win_num(sphb) == 0 && !def_win_removed) { | |
259 | spapr_phb_dma_reset(sphb); | |
260 | trace_spapr_iommu_ddw_reset(sphb->buid, 0); | |
261 | } | |
262 | ||
ae4de14c AK |
263 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
264 | return; | |
265 | ||
266 | param_error_exit: | |
267 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); | |
268 | } | |
269 | ||
270 | static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu, | |
ce2918cb | 271 | SpaprMachineState *spapr, |
ae4de14c AK |
272 | uint32_t token, uint32_t nargs, |
273 | target_ulong args, | |
274 | uint32_t nret, target_ulong rets) | |
275 | { | |
ce2918cb | 276 | SpaprPhbState *sphb; |
ae4de14c AK |
277 | uint64_t buid; |
278 | uint32_t addr; | |
279 | ||
280 | if ((nargs != 3) || (nret != 1)) { | |
281 | goto param_error_exit; | |
282 | } | |
283 | ||
284 | buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); | |
285 | addr = rtas_ld(args, 0); | |
286 | sphb = spapr_pci_find_phb(spapr, buid); | |
287 | if (!sphb || !sphb->ddw_enabled) { | |
288 | goto param_error_exit; | |
289 | } | |
290 | ||
291 | spapr_phb_dma_reset(sphb); | |
292 | trace_spapr_iommu_ddw_reset(buid, addr); | |
293 | ||
294 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); | |
295 | ||
296 | return; | |
297 | ||
298 | param_error_exit: | |
299 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); | |
300 | } | |
301 | ||
302 | static void spapr_rtas_ddw_init(void) | |
303 | { | |
304 | spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW, | |
305 | "ibm,query-pe-dma-window", | |
306 | rtas_ibm_query_pe_dma_window); | |
307 | spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW, | |
308 | "ibm,create-pe-dma-window", | |
309 | rtas_ibm_create_pe_dma_window); | |
310 | spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW, | |
311 | "ibm,remove-pe-dma-window", | |
312 | rtas_ibm_remove_pe_dma_window); | |
313 | spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW, | |
314 | "ibm,reset-pe-dma-window", | |
315 | rtas_ibm_reset_pe_dma_window); | |
316 | } | |
317 | ||
318 | type_init(spapr_rtas_ddw_init) |