1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3 * Copyright (C) 2012-2014, 2018-2019, 2021 Intel Corporation
4 * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
5 * Copyright (C) 2016-2017 Intel Deutschland GmbH
6 */
7 #include "iwl-drv.h"
8 #include "runtime.h"
9 #include "fw/api/commands.h"
10
iwl_free_fw_paging(struct iwl_fw_runtime * fwrt)11 void iwl_free_fw_paging(struct iwl_fw_runtime *fwrt)
12 {
13 int i;
14
15 if (!fwrt->fw_paging_db[0].fw_paging_block)
16 return;
17
18 for (i = 0; i < NUM_OF_FW_PAGING_BLOCKS; i++) {
19 struct iwl_fw_paging *paging = &fwrt->fw_paging_db[i];
20
21 if (!paging->fw_paging_block) {
22 IWL_DEBUG_FW(fwrt,
23 "Paging: block %d already freed, continue to next page\n",
24 i);
25
26 continue;
27 }
28 dma_unmap_page(fwrt->trans->dev, paging->fw_paging_phys,
29 paging->fw_paging_size, DMA_BIDIRECTIONAL);
30
31 __free_pages(paging->fw_paging_block,
32 get_order(paging->fw_paging_size));
33 paging->fw_paging_block = NULL;
34 }
35
36 memset(fwrt->fw_paging_db, 0, sizeof(fwrt->fw_paging_db));
37 }
38 IWL_EXPORT_SYMBOL(iwl_free_fw_paging);
39
iwl_alloc_fw_paging_mem(struct iwl_fw_runtime * fwrt,const struct fw_img * image)40 static int iwl_alloc_fw_paging_mem(struct iwl_fw_runtime *fwrt,
41 const struct fw_img *image)
42 {
43 struct page *block;
44 dma_addr_t phys = 0;
45 int blk_idx, order, num_of_pages, size;
46
47 if (fwrt->fw_paging_db[0].fw_paging_block)
48 return 0;
49
50 /* ensure BLOCK_2_EXP_SIZE is power of 2 of PAGING_BLOCK_SIZE */
51 BUILD_BUG_ON(BIT(BLOCK_2_EXP_SIZE) != PAGING_BLOCK_SIZE);
52
53 num_of_pages = image->paging_mem_size / FW_PAGING_SIZE;
54 fwrt->num_of_paging_blk =
55 DIV_ROUND_UP(num_of_pages, NUM_OF_PAGE_PER_GROUP);
56 fwrt->num_of_pages_in_last_blk =
57 num_of_pages -
58 NUM_OF_PAGE_PER_GROUP * (fwrt->num_of_paging_blk - 1);
59
60 IWL_DEBUG_FW(fwrt,
61 "Paging: allocating mem for %d paging blocks, each block holds 8 pages, last block holds %d pages\n",
62 fwrt->num_of_paging_blk,
63 fwrt->num_of_pages_in_last_blk);
64
65 /*
66 * Allocate CSS and paging blocks in dram.
67 */
68 for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
69 /* For CSS allocate 4KB, for others PAGING_BLOCK_SIZE (32K) */
70 size = blk_idx ? PAGING_BLOCK_SIZE : FW_PAGING_SIZE;
71 order = get_order(size);
72 block = alloc_pages(GFP_KERNEL, order);
73 if (!block) {
74 /* free all the previous pages since we failed */
75 iwl_free_fw_paging(fwrt);
76 return -ENOMEM;
77 }
78
79 fwrt->fw_paging_db[blk_idx].fw_paging_block = block;
80 fwrt->fw_paging_db[blk_idx].fw_paging_size = size;
81
82 phys = dma_map_page(fwrt->trans->dev, block, 0,
83 PAGE_SIZE << order,
84 DMA_BIDIRECTIONAL);
85 if (dma_mapping_error(fwrt->trans->dev, phys)) {
86 /*
87 * free the previous pages and the current one
88 * since we failed to map_page.
89 */
90 iwl_free_fw_paging(fwrt);
91 return -ENOMEM;
92 }
93 fwrt->fw_paging_db[blk_idx].fw_paging_phys = phys;
94
95 if (!blk_idx)
96 IWL_DEBUG_FW(fwrt,
97 "Paging: allocated 4K(CSS) bytes (order %d) for firmware paging.\n",
98 order);
99 else
100 IWL_DEBUG_FW(fwrt,
101 "Paging: allocated 32K bytes (order %d) for firmware paging.\n",
102 order);
103 }
104
105 return 0;
106 }
107
iwl_fill_paging_mem(struct iwl_fw_runtime * fwrt,const struct fw_img * image)108 static int iwl_fill_paging_mem(struct iwl_fw_runtime *fwrt,
109 const struct fw_img *image)
110 {
111 int sec_idx, idx, ret;
112 u32 offset = 0;
113
114 /*
115 * find where is the paging image start point:
116 * if CPU2 exist and it's in paging format, then the image looks like:
117 * CPU1 sections (2 or more)
118 * CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between CPU1 to CPU2
119 * CPU2 sections (not paged)
120 * PAGING_SEPARATOR_SECTION delimiter - separate between CPU2
121 * non paged to CPU2 paging sec
122 * CPU2 paging CSS
123 * CPU2 paging image (including instruction and data)
124 */
125 for (sec_idx = 0; sec_idx < image->num_sec; sec_idx++) {
126 if (image->sec[sec_idx].offset == PAGING_SEPARATOR_SECTION) {
127 sec_idx++;
128 break;
129 }
130 }
131
132 /*
133 * If paging is enabled there should be at least 2 more sections left
134 * (one for CSS and one for Paging data)
135 */
136 if (sec_idx >= image->num_sec - 1) {
137 IWL_ERR(fwrt, "Paging: Missing CSS and/or paging sections\n");
138 ret = -EINVAL;
139 goto err;
140 }
141
142 /* copy the CSS block to the dram */
143 IWL_DEBUG_FW(fwrt, "Paging: load paging CSS to FW, sec = %d\n",
144 sec_idx);
145
146 if (image->sec[sec_idx].len > fwrt->fw_paging_db[0].fw_paging_size) {
147 IWL_ERR(fwrt, "CSS block is larger than paging size\n");
148 ret = -EINVAL;
149 goto err;
150 }
151
152 memcpy(page_address(fwrt->fw_paging_db[0].fw_paging_block),
153 image->sec[sec_idx].data,
154 image->sec[sec_idx].len);
155 fwrt->fw_paging_db[0].fw_offs = image->sec[sec_idx].offset;
156 dma_sync_single_for_device(fwrt->trans->dev,
157 fwrt->fw_paging_db[0].fw_paging_phys,
158 fwrt->fw_paging_db[0].fw_paging_size,
159 DMA_BIDIRECTIONAL);
160
161 IWL_DEBUG_FW(fwrt,
162 "Paging: copied %d CSS bytes to first block\n",
163 fwrt->fw_paging_db[0].fw_paging_size);
164
165 sec_idx++;
166
167 /*
168 * Copy the paging blocks to the dram. The loop index starts
169 * from 1 since the CSS block (index 0) was already copied to
170 * dram. We use num_of_paging_blk + 1 to account for that.
171 */
172 for (idx = 1; idx < fwrt->num_of_paging_blk + 1; idx++) {
173 struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];
174 int remaining = image->sec[sec_idx].len - offset;
175 int len = block->fw_paging_size;
176
177 /*
178 * For the last block, we copy all that is remaining,
179 * for all other blocks, we copy fw_paging_size at a
180 * time. */
181 if (idx == fwrt->num_of_paging_blk) {
182 len = remaining;
183 if (remaining !=
184 fwrt->num_of_pages_in_last_blk * FW_PAGING_SIZE) {
185 IWL_ERR(fwrt,
186 "Paging: last block contains more data than expected %d\n",
187 remaining);
188 ret = -EINVAL;
189 goto err;
190 }
191 } else if (block->fw_paging_size > remaining) {
192 IWL_ERR(fwrt,
193 "Paging: not enough data in other in block %d (%d)\n",
194 idx, remaining);
195 ret = -EINVAL;
196 goto err;
197 }
198
199 memcpy(page_address(block->fw_paging_block),
200 image->sec[sec_idx].data + offset, len);
201 block->fw_offs = image->sec[sec_idx].offset + offset;
202 dma_sync_single_for_device(fwrt->trans->dev,
203 block->fw_paging_phys,
204 block->fw_paging_size,
205 DMA_BIDIRECTIONAL);
206
207 IWL_DEBUG_FW(fwrt,
208 "Paging: copied %d paging bytes to block %d\n",
209 len, idx);
210
211 offset += block->fw_paging_size;
212 }
213
214 return 0;
215
216 err:
217 iwl_free_fw_paging(fwrt);
218 return ret;
219 }
220
iwl_save_fw_paging(struct iwl_fw_runtime * fwrt,const struct fw_img * fw)221 static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
222 const struct fw_img *fw)
223 {
224 int ret;
225
226 ret = iwl_alloc_fw_paging_mem(fwrt, fw);
227 if (ret)
228 return ret;
229
230 return iwl_fill_paging_mem(fwrt, fw);
231 }
232
233 /* send paging cmd to FW in case CPU2 has paging image */
iwl_send_paging_cmd(struct iwl_fw_runtime * fwrt,const struct fw_img * fw)234 static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
235 const struct fw_img *fw)
236 {
237 struct iwl_fw_paging_cmd paging_cmd = {
238 .flags = cpu_to_le32(PAGING_CMD_IS_SECURED |
239 PAGING_CMD_IS_ENABLED |
240 (fwrt->num_of_pages_in_last_blk <<
241 PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
242 .block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
243 .block_num = cpu_to_le32(fwrt->num_of_paging_blk),
244 };
245 struct iwl_host_cmd hcmd = {
246 .id = iwl_cmd_id(FW_PAGING_BLOCK_CMD, IWL_ALWAYS_LONG_GROUP, 0),
247 .len = { sizeof(paging_cmd), },
248 .data = { &paging_cmd, },
249 };
250 int blk_idx;
251
252 /* loop for for all paging blocks + CSS block */
253 for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
254 dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
255 __le32 phy_addr;
256
257 addr = addr >> PAGE_2_EXP_SIZE;
258 phy_addr = cpu_to_le32(addr);
259 paging_cmd.device_phy_addr[blk_idx] = phy_addr;
260 }
261
262 return iwl_trans_send_cmd(fwrt->trans, &hcmd);
263 }
264
iwl_init_paging(struct iwl_fw_runtime * fwrt,enum iwl_ucode_type type)265 int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
266 {
267 const struct fw_img *fw = &fwrt->fw->img[type];
268 int ret;
269
270 if (fwrt->trans->trans_cfg->gen2)
271 return 0;
272
273 /*
274 * Configure and operate fw paging mechanism.
275 * The driver configures the paging flow only once.
276 * The CPU2 paging image is included in the IWL_UCODE_INIT image.
277 */
278 if (!fw->paging_mem_size)
279 return 0;
280
281 ret = iwl_save_fw_paging(fwrt, fw);
282 if (ret) {
283 IWL_ERR(fwrt, "failed to save the FW paging image\n");
284 return ret;
285 }
286
287 ret = iwl_send_paging_cmd(fwrt, fw);
288 if (ret) {
289 IWL_ERR(fwrt, "failed to send the paging cmd\n");
290 iwl_free_fw_paging(fwrt);
291 return ret;
292 }
293
294 return 0;
295 }
296 IWL_EXPORT_SYMBOL(iwl_init_paging);
297