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" |
21 | #include "cpu.h" |
22 | #include "qemu/error-report.h" |
23 | #include "qemu/module.h" |
24 | #include "hw/ppc/spapr.h" |
25 | #include "hw/pci-host/spapr.h" |
26 | #include "trace.h" |
27 | |
28 | static int spapr_phb_get_active_win_num_cb(Object *child, void *opaque) |
29 | { |
30 | SpaprTceTable *tcet; |
31 | |
32 | tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); |
33 | if (tcet && tcet->nb_table) { |
34 | ++*(unsigned *)opaque; |
35 | } |
36 | return 0; |
37 | } |
38 | |
39 | static unsigned spapr_phb_get_active_win_num(SpaprPhbState *sphb) |
40 | { |
41 | unsigned ret = 0; |
42 | |
43 | object_child_foreach(OBJECT(sphb), spapr_phb_get_active_win_num_cb, &ret); |
44 | |
45 | return ret; |
46 | } |
47 | |
48 | static int spapr_phb_get_free_liobn_cb(Object *child, void *opaque) |
49 | { |
50 | SpaprTceTable *tcet; |
51 | |
52 | tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); |
53 | if (tcet && !tcet->nb_table) { |
54 | *(uint32_t *)opaque = tcet->liobn; |
55 | return 1; |
56 | } |
57 | return 0; |
58 | } |
59 | |
60 | static unsigned spapr_phb_get_free_liobn(SpaprPhbState *sphb) |
61 | { |
62 | uint32_t liobn = 0; |
63 | |
64 | object_child_foreach(OBJECT(sphb), spapr_phb_get_free_liobn_cb, &liobn); |
65 | |
66 | return liobn; |
67 | } |
68 | |
69 | static uint32_t spapr_page_mask_to_query_mask(uint64_t page_mask) |
70 | { |
71 | int i; |
72 | uint32_t mask = 0; |
73 | const struct { int shift; uint32_t mask; } masks[] = { |
74 | { 12, RTAS_DDW_PGSIZE_4K }, |
75 | { 16, RTAS_DDW_PGSIZE_64K }, |
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, |
94 | SpaprMachineState *spapr, |
95 | uint32_t token, uint32_t nargs, |
96 | target_ulong args, |
97 | uint32_t nret, target_ulong rets) |
98 | { |
99 | SpaprPhbState *sphb; |
100 | uint64_t buid; |
101 | uint32_t avail, addr, pgmask = 0; |
102 | |
103 | if ((nargs != 3) || (nret != 5)) { |
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 | |
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); |
121 | rtas_st(rets, 2, 0x80000000); /* The largest window we can possibly have */ |
122 | rtas_st(rets, 3, pgmask); |
123 | rtas_st(rets, 4, 0); /* DMA migration mask, not supported */ |
124 | |
125 | trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask); |
126 | return; |
127 | |
128 | param_error_exit: |
129 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
130 | } |
131 | |
132 | static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu, |
133 | SpaprMachineState *spapr, |
134 | uint32_t token, uint32_t nargs, |
135 | target_ulong args, |
136 | uint32_t nret, target_ulong rets) |
137 | { |
138 | SpaprPhbState *sphb; |
139 | SpaprTceTable *tcet = NULL; |
140 | uint32_t addr, page_shift, window_shift, liobn; |
141 | uint64_t buid, win_addr; |
142 | int windows; |
143 | |
144 | if ((nargs != 5) || (nret != 4)) { |
145 | goto param_error_exit; |
146 | } |
147 | |
148 | buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); |
149 | addr = rtas_ld(args, 0); |
150 | sphb = spapr_pci_find_phb(spapr, buid); |
151 | if (!sphb || !sphb->ddw_enabled) { |
152 | goto param_error_exit; |
153 | } |
154 | |
155 | page_shift = rtas_ld(args, 3); |
156 | window_shift = rtas_ld(args, 4); |
157 | liobn = spapr_phb_get_free_liobn(sphb); |
158 | windows = spapr_phb_get_active_win_num(sphb); |
159 | |
160 | if (!(sphb->page_size_mask & (1ULL << page_shift)) || |
161 | (window_shift < page_shift)) { |
162 | goto param_error_exit; |
163 | } |
164 | |
165 | if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) { |
166 | goto hw_error_exit; |
167 | } |
168 | |
169 | tcet = spapr_tce_find_by_liobn(liobn); |
170 | if (!tcet) { |
171 | goto hw_error_exit; |
172 | } |
173 | |
174 | win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr; |
175 | /* |
176 | * We have just created a window, we know for the fact that it is empty, |
177 | * use a hack to avoid iterating over the table as it is quite possible |
178 | * to have billions of TCEs, all empty. |
179 | * Note that we cannot delay this to the first H_PUT_TCE as this hcall is |
180 | * mostly likely to be handled in KVM so QEMU just does not know if it |
181 | * happened. |
182 | */ |
183 | tcet->skipping_replay = true; |
184 | spapr_tce_table_enable(tcet, page_shift, win_addr, |
185 | 1ULL << (window_shift - page_shift)); |
186 | tcet->skipping_replay = false; |
187 | if (!tcet->nb_table) { |
188 | goto hw_error_exit; |
189 | } |
190 | |
191 | trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift, |
192 | 1ULL << window_shift, tcet->bus_offset, liobn); |
193 | |
194 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
195 | rtas_st(rets, 1, liobn); |
196 | rtas_st(rets, 2, tcet->bus_offset >> 32); |
197 | rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1)); |
198 | |
199 | return; |
200 | |
201 | hw_error_exit: |
202 | rtas_st(rets, 0, RTAS_OUT_HW_ERROR); |
203 | return; |
204 | |
205 | param_error_exit: |
206 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
207 | } |
208 | |
209 | static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu, |
210 | SpaprMachineState *spapr, |
211 | uint32_t token, uint32_t nargs, |
212 | target_ulong args, |
213 | uint32_t nret, target_ulong rets) |
214 | { |
215 | SpaprPhbState *sphb; |
216 | SpaprTceTable *tcet; |
217 | uint32_t liobn; |
218 | |
219 | if ((nargs != 1) || (nret != 1)) { |
220 | goto param_error_exit; |
221 | } |
222 | |
223 | liobn = rtas_ld(args, 0); |
224 | tcet = spapr_tce_find_by_liobn(liobn); |
225 | if (!tcet) { |
226 | goto param_error_exit; |
227 | } |
228 | |
229 | sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent); |
230 | if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) { |
231 | goto param_error_exit; |
232 | } |
233 | |
234 | spapr_tce_table_disable(tcet); |
235 | trace_spapr_iommu_ddw_remove(liobn); |
236 | |
237 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
238 | return; |
239 | |
240 | param_error_exit: |
241 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
242 | } |
243 | |
244 | static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu, |
245 | SpaprMachineState *spapr, |
246 | uint32_t token, uint32_t nargs, |
247 | target_ulong args, |
248 | uint32_t nret, target_ulong rets) |
249 | { |
250 | SpaprPhbState *sphb; |
251 | uint64_t buid; |
252 | uint32_t addr; |
253 | |
254 | if ((nargs != 3) || (nret != 1)) { |
255 | goto param_error_exit; |
256 | } |
257 | |
258 | buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); |
259 | addr = rtas_ld(args, 0); |
260 | sphb = spapr_pci_find_phb(spapr, buid); |
261 | if (!sphb || !sphb->ddw_enabled) { |
262 | goto param_error_exit; |
263 | } |
264 | |
265 | spapr_phb_dma_reset(sphb); |
266 | trace_spapr_iommu_ddw_reset(buid, addr); |
267 | |
268 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
269 | |
270 | return; |
271 | |
272 | param_error_exit: |
273 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
274 | } |
275 | |
276 | static void spapr_rtas_ddw_init(void) |
277 | { |
278 | spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW, |
279 | "ibm,query-pe-dma-window" , |
280 | rtas_ibm_query_pe_dma_window); |
281 | spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW, |
282 | "ibm,create-pe-dma-window" , |
283 | rtas_ibm_create_pe_dma_window); |
284 | spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW, |
285 | "ibm,remove-pe-dma-window" , |
286 | rtas_ibm_remove_pe_dma_window); |
287 | spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW, |
288 | "ibm,reset-pe-dma-window" , |
289 | rtas_ibm_reset_pe_dma_window); |
290 | } |
291 | |
292 | type_init(spapr_rtas_ddw_init) |
293 | |