1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3 * Copyright (C) 2012-2014, 2018-2019 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 dma_sync_single_for_device(fwrt->trans->dev,
156 fwrt->fw_paging_db[0].fw_paging_phys,
157 fwrt->fw_paging_db[0].fw_paging_size,
158 DMA_BIDIRECTIONAL);
159
160 IWL_DEBUG_FW(fwrt,
161 "Paging: copied %d CSS bytes to first block\n",
162 fwrt->fw_paging_db[0].fw_paging_size);
163
164 sec_idx++;
165
166 /*
167 * Copy the paging blocks to the dram. The loop index starts
168 * from 1 since the CSS block (index 0) was already copied to
169 * dram. We use num_of_paging_blk + 1 to account for that.
170 */
171 for (idx = 1; idx < fwrt->num_of_paging_blk + 1; idx++) {
172 struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];
173 int remaining = image->sec[sec_idx].len - offset;
174 int len = block->fw_paging_size;
175
176 /*
177 * For the last block, we copy all that is remaining,
178 * for all other blocks, we copy fw_paging_size at a
179 * time. */
180 if (idx == fwrt->num_of_paging_blk) {
181 len = remaining;
182 if (remaining !=
183 fwrt->num_of_pages_in_last_blk * FW_PAGING_SIZE) {
184 IWL_ERR(fwrt,
185 "Paging: last block contains more data than expected %d\n",
186 remaining);
187 ret = -EINVAL;
188 goto err;
189 }
190 } else if (block->fw_paging_size > remaining) {
191 IWL_ERR(fwrt,
192 "Paging: not enough data in other in block %d (%d)\n",
193 idx, remaining);
194 ret = -EINVAL;
195 goto err;
196 }
197
198 memcpy(page_address(block->fw_paging_block),
199 image->sec[sec_idx].data + offset, len);
200 dma_sync_single_for_device(fwrt->trans->dev,
201 block->fw_paging_phys,
202 block->fw_paging_size,
203 DMA_BIDIRECTIONAL);
204
205 IWL_DEBUG_FW(fwrt,
206 "Paging: copied %d paging bytes to block %d\n",
207 len, idx);
208
209 offset += block->fw_paging_size;
210 }
211
212 return 0;
213
214 err:
215 iwl_free_fw_paging(fwrt);
216 return ret;
217 }
218
iwl_save_fw_paging(struct iwl_fw_runtime * fwrt,const struct fw_img * fw)219 static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
220 const struct fw_img *fw)
221 {
222 int ret;
223
224 ret = iwl_alloc_fw_paging_mem(fwrt, fw);
225 if (ret)
226 return ret;
227
228 return iwl_fill_paging_mem(fwrt, fw);
229 }
230
231 /* 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)232 static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
233 const struct fw_img *fw)
234 {
235 struct iwl_fw_paging_cmd paging_cmd = {
236 .flags = cpu_to_le32(PAGING_CMD_IS_SECURED |
237 PAGING_CMD_IS_ENABLED |
238 (fwrt->num_of_pages_in_last_blk <<
239 PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
240 .block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
241 .block_num = cpu_to_le32(fwrt->num_of_paging_blk),
242 };
243 struct iwl_host_cmd hcmd = {
244 .id = iwl_cmd_id(FW_PAGING_BLOCK_CMD, IWL_ALWAYS_LONG_GROUP, 0),
245 .len = { sizeof(paging_cmd), },
246 .data = { &paging_cmd, },
247 };
248 int blk_idx;
249
250 /* loop for for all paging blocks + CSS block */
251 for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
252 dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
253 __le32 phy_addr;
254
255 addr = addr >> PAGE_2_EXP_SIZE;
256 phy_addr = cpu_to_le32(addr);
257 paging_cmd.device_phy_addr[blk_idx] = phy_addr;
258 }
259
260 return iwl_trans_send_cmd(fwrt->trans, &hcmd);
261 }
262
iwl_init_paging(struct iwl_fw_runtime * fwrt,enum iwl_ucode_type type)263 int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
264 {
265 const struct fw_img *fw = &fwrt->fw->img[type];
266 int ret;
267
268 if (fwrt->trans->trans_cfg->gen2)
269 return 0;
270
271 /*
272 * Configure and operate fw paging mechanism.
273 * The driver configures the paging flow only once.
274 * The CPU2 paging image is included in the IWL_UCODE_INIT image.
275 */
276 if (!fw->paging_mem_size)
277 return 0;
278
279 ret = iwl_save_fw_paging(fwrt, fw);
280 if (ret) {
281 IWL_ERR(fwrt, "failed to save the FW paging image\n");
282 return ret;
283 }
284
285 ret = iwl_send_paging_cmd(fwrt, fw);
286 if (ret) {
287 IWL_ERR(fwrt, "failed to send the paging cmd\n");
288 iwl_free_fw_paging(fwrt);
289 return ret;
290 }
291
292 return 0;
293 }
294 IWL_EXPORT_SYMBOL(iwl_init_paging);
295