[ammarfaizi2-block:google/android/kernel/common/android13-5.10 2579/9999] mm/hmm.c:177:13: error: implicit declaration of function 'pmd_protnone'; did you mean 'pmd_none'?

From: kernel test robot
Date: Sat Jan 08 2022 - 03:28:01 EST

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Hi Jihan,

First bad commit (maybe != root cause):

tree: https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android13-5.10
head: d5c19346d14b2bdccf8b127cdbcc36696539d6bb
commit: 2ea27b7efa3f6fd0b4fab6a748ab08322280f29b [2579/9999] ANDROID: GKI: Kconfig.gki: enable CONFIG_HMM_MIRROR with HIDDEN GPU
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220108/202201081628.NT1tKBMO-lkp@xxxxxxxxx/config)
compiler: sh4-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/ammarfaizi2/linux-block/commit/2ea27b7efa3f6fd0b4fab6a748ab08322280f29b
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android13-5.10
git checkout 2ea27b7efa3f6fd0b4fab6a748ab08322280f29b
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sh SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

mm/hmm.c: In function 'pmd_to_hmm_pfn_flags':
>> mm/hmm.c:177:13: error: implicit declaration of function 'pmd_protnone'; did you mean 'pmd_none'? [-Werror=implicit-function-declaration]
177 | if (pmd_protnone(pmd))
| ^~~~~~~~~~~~
| pmd_none
>> mm/hmm.c:179:17: error: implicit declaration of function 'pmd_write'; did you mean 'pgd_write'? [-Werror=implicit-function-declaration]
179 | return (pmd_write(pmd) ? (HMM_PFN_VALID | HMM_PFN_WRITE) :
| ^~~~~~~~~
| pgd_write
mm/hmm.c: In function 'hmm_is_device_private_entry':
>> mm/hmm.c:216:16: error: implicit declaration of function 'is_device_private_entry'; did you mean 'hmm_is_device_private_entry'? [-Werror=implicit-function-declaration]
216 | return is_device_private_entry(entry) &&
| ^~~~~~~~~~~~~~~~~~~~~~~
| hmm_is_device_private_entry
>> mm/hmm.c:217:17: error: implicit declaration of function 'device_private_entry_to_page' [-Werror=implicit-function-declaration]
217 | device_private_entry_to_page(entry)->pgmap->owner ==
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> mm/hmm.c:217:52: error: invalid type argument of '->' (have 'int')
217 | device_private_entry_to_page(entry)->pgmap->owner ==
| ^~
mm/hmm.c: In function 'pte_to_hmm_pfn_flags':
>> mm/hmm.c:224:51: error: implicit declaration of function 'pte_protnone'; did you mean 'pte_none'? [-Werror=implicit-function-declaration]
224 | if (pte_none(pte) || !pte_present(pte) || pte_protnone(pte))
| ^~~~~~~~~~~~
| pte_none
mm/hmm.c: In function 'hmm_vma_handle_pte':
>> mm/hmm.c:250:37: error: implicit declaration of function 'pte_to_swp_entry' [-Werror=implicit-function-declaration]
250 | swp_entry_t entry = pte_to_swp_entry(pte);
| ^~~~~~~~~~~~~~~~
>> mm/hmm.c:250:37: error: invalid initializer
>> mm/hmm.c:258:29: error: implicit declaration of function 'is_write_device_private_entry'; did you mean 'hmm_is_device_private_entry'? [-Werror=implicit-function-declaration]
258 | if (is_write_device_private_entry(entry))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| hmm_is_device_private_entry
>> mm/hmm.c:260:36: error: implicit declaration of function 'device_private_entry_to_pfn' [-Werror=implicit-function-declaration]
260 | *hmm_pfn = device_private_entry_to_pfn(entry) |
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> mm/hmm.c:272:22: error: implicit declaration of function 'non_swap_entry' [-Werror=implicit-function-declaration]
272 | if (!non_swap_entry(entry))
| ^~~~~~~~~~~~~~
>> mm/hmm.c:275:21: error: implicit declaration of function 'is_migration_entry' [-Werror=implicit-function-declaration]
275 | if (is_migration_entry(entry)) {
| ^~~~~~~~~~~~~~~~~~
>> mm/hmm.c:276:25: error: implicit declaration of function 'pte_unmap'; did you mean 'pmb_unmap'? [-Werror=implicit-function-declaration]
276 | pte_unmap(ptep);
| ^~~~~~~~~
| pmb_unmap
>> mm/hmm.c:278:25: error: implicit declaration of function 'migration_entry_wait' [-Werror=implicit-function-declaration]
278 | migration_entry_wait(walk->mm, pmdp, addr);
| ^~~~~~~~~~~~~~~~~~~~
mm/hmm.c: In function 'hmm_vma_walk_pmd':
>> mm/hmm.c:334:42: error: implicit declaration of function 'is_pmd_migration_entry' [-Werror=implicit-function-declaration]
334 | if (thp_migration_supported() && is_pmd_migration_entry(pmd)) {
| ^~~~~~~~~~~~~~~~~~~~~~
>> mm/hmm.c:337:25: error: implicit declaration of function 'pmd_migration_entry_wait' [-Werror=implicit-function-declaration]
337 | pmd_migration_entry_wait(walk->mm, pmdp);
| ^~~~~~~~~~~~~~~~~~~~~~~~
>> mm/hmm.c:349:13: error: implicit declaration of function 'pmd_devmap'; did you mean 'pte_devmap'? [-Werror=implicit-function-declaration]
349 | if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) {
| ^~~~~~~~~~
| pte_devmap
>> mm/hmm.c:349:32: error: implicit declaration of function 'pmd_trans_huge'; did you mean 'pmd_trans_huge_lock'? [-Werror=implicit-function-declaration]
349 | if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) {
| ^~~~~~~~~~~~~~
| pmd_trans_huge_lock
>> mm/hmm.c:359:23: error: implicit declaration of function 'pmd_read_atomic' [-Werror=implicit-function-declaration]
359 | pmd = pmd_read_atomic(pmdp);
| ^~~~~~~~~~~~~~~
>> mm/hmm.c:359:23: error: incompatible types when assigning to type 'pmd_t' from type 'int'
mm/hmm.c:379:16: error: implicit declaration of function 'pte_offset_map'; did you mean 'pte_offset_map_lock'? [-Werror=implicit-function-declaration]
379 | ptep = pte_offset_map(pmdp, addr);
| ^~~~~~~~~~~~~~
| pte_offset_map_lock
mm/hmm.c:379:14: warning: assignment to 'pte_t *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
379 | ptep = pte_offset_map(pmdp, addr);
| ^
mm/hmm.c: In function 'hmm_is_device_private_entry':
mm/hmm.c:219:1: error: control reaches end of non-void function [-Werror=return-type]
219 | }
| ^
cc1: some warnings being treated as errors

Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for DMADEVICES
Depends on HAS_DMA
Selected by
- GKI_HIDDEN_SND_SOC_CONFIGS
WARNING: unmet direct dependencies detected for DRM_MIPI_DSI
Depends on HAS_IOMEM && DRM
Selected by
- GKI_HIDDEN_DRM_CONFIGS
WARNING: unmet direct dependencies detected for SND_ATMEL_SOC_PDC
Depends on SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && HAS_DMA
Selected by
- SND_ATMEL_SOC_SSC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC
- SND_ATMEL_SOC_SSC_PDC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && ATMEL_SSC
WARNING: unmet direct dependencies detected for DRM_KMS_CMA_HELPER
Depends on HAS_IOMEM && DRM
Selected by
- GKI_HIDDEN_DRM_CONFIGS
WARNING: unmet direct dependencies detected for HMM_MIRROR
Depends on MMU
Selected by
- GKI_HIDDEN_GPU_CONFIGS
WARNING: unmet direct dependencies detected for DRM_GEM_CMA_HELPER
Depends on HAS_IOMEM && DRM
Selected by
- GKI_HIDDEN_DRM_CONFIGS
WARNING: unmet direct dependencies detected for BALLOON_COMPACTION
Depends on COMPACTION && MEMORY_BALLOON
Selected by
- GKI_HIDDEN_MM_CONFIGS

vim +177 mm/hmm.c

3b50a6e536d2d8 Ralph Campbell 2020-07-01 173
2733ea144dcce7 Jason Gunthorpe 2020-05-01 174 static inline unsigned long pmd_to_hmm_pfn_flags(struct hmm_range *range,
2733ea144dcce7 Jason Gunthorpe 2020-05-01 175 pmd_t pmd)
2aee09d8c11642 Jérôme Glisse 2018-04-10 176 {
2aee09d8c11642 Jérôme Glisse 2018-04-10 @177 if (pmd_protnone(pmd))
2aee09d8c11642 Jérôme Glisse 2018-04-10 178 return 0;
3b50a6e536d2d8 Ralph Campbell 2020-07-01 @179 return (pmd_write(pmd) ? (HMM_PFN_VALID | HMM_PFN_WRITE) :
3b50a6e536d2d8 Ralph Campbell 2020-07-01 180 HMM_PFN_VALID) |
3b50a6e536d2d8 Ralph Campbell 2020-07-01 181 hmm_pfn_flags_order(PMD_SHIFT - PAGE_SHIFT);
da4c3c735ea4dc Jérôme Glisse 2017-09-08 182 }
da4c3c735ea4dc Jérôme Glisse 2017-09-08 183
992de9a8b75116 Jérôme Glisse 2019-05-13 184 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
9d3973d60f0abd Christoph Hellwig 2019-08-06 185 static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
2733ea144dcce7 Jason Gunthorpe 2020-05-01 186 unsigned long end, unsigned long hmm_pfns[],
2733ea144dcce7 Jason Gunthorpe 2020-05-01 187 pmd_t pmd)
9d3973d60f0abd Christoph Hellwig 2019-08-06 188 {
74eee180b935fc Jérôme Glisse 2017-09-08 189 struct hmm_vma_walk *hmm_vma_walk = walk->private;
f88a1e90c66540 Jérôme Glisse 2018-04-10 190 struct hmm_range *range = hmm_vma_walk->range;
2aee09d8c11642 Jérôme Glisse 2018-04-10 191 unsigned long pfn, npages, i;
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 192 unsigned int required_fault;
2733ea144dcce7 Jason Gunthorpe 2020-05-01 193 unsigned long cpu_flags;
da4c3c735ea4dc Jérôme Glisse 2017-09-08 194
2aee09d8c11642 Jérôme Glisse 2018-04-10 195 npages = (end - addr) >> PAGE_SHIFT;
f88a1e90c66540 Jérôme Glisse 2018-04-10 196 cpu_flags = pmd_to_hmm_pfn_flags(range, pmd);
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 197 required_fault =
2733ea144dcce7 Jason Gunthorpe 2020-05-01 198 hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, cpu_flags);
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 199 if (required_fault)
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 200 return hmm_vma_fault(addr, end, required_fault, walk);
74eee180b935fc Jérôme Glisse 2017-09-08 201
309f9a4f5e1a23 Christoph Hellwig 2019-08-06 202 pfn = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
068354ade5dd9e Jason Gunthorpe 2020-03-27 203 for (i = 0; addr < end; addr += PAGE_SIZE, i++, pfn++)
2733ea144dcce7 Jason Gunthorpe 2020-05-01 204 hmm_pfns[i] = pfn | cpu_flags;
da4c3c735ea4dc Jérôme Glisse 2017-09-08 205 return 0;
da4c3c735ea4dc Jérôme Glisse 2017-09-08 206 }
9d3973d60f0abd Christoph Hellwig 2019-08-06 207 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
9d3973d60f0abd Christoph Hellwig 2019-08-06 208 /* stub to allow the code below to compile */
9d3973d60f0abd Christoph Hellwig 2019-08-06 209 int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
2733ea144dcce7 Jason Gunthorpe 2020-05-01 210 unsigned long end, unsigned long hmm_pfns[], pmd_t pmd);
9d3973d60f0abd Christoph Hellwig 2019-08-06 211 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
da4c3c735ea4dc Jérôme Glisse 2017-09-08 212
08ddddda667b3b Christoph Hellwig 2020-03-16 213 static inline bool hmm_is_device_private_entry(struct hmm_range *range,
08ddddda667b3b Christoph Hellwig 2020-03-16 214 swp_entry_t entry)
08ddddda667b3b Christoph Hellwig 2020-03-16 215 {
08ddddda667b3b Christoph Hellwig 2020-03-16 @216 return is_device_private_entry(entry) &&
08ddddda667b3b Christoph Hellwig 2020-03-16 @217 device_private_entry_to_page(entry)->pgmap->owner ==
08ddddda667b3b Christoph Hellwig 2020-03-16 218 range->dev_private_owner;
08ddddda667b3b Christoph Hellwig 2020-03-16 219 }
08ddddda667b3b Christoph Hellwig 2020-03-16 220
2733ea144dcce7 Jason Gunthorpe 2020-05-01 221 static inline unsigned long pte_to_hmm_pfn_flags(struct hmm_range *range,
2733ea144dcce7 Jason Gunthorpe 2020-05-01 222 pte_t pte)
2aee09d8c11642 Jérôme Glisse 2018-04-10 223 {
789c2af88f24d1 Philip Yang 2019-05-23 @224 if (pte_none(pte) || !pte_present(pte) || pte_protnone(pte))
2aee09d8c11642 Jérôme Glisse 2018-04-10 225 return 0;
2733ea144dcce7 Jason Gunthorpe 2020-05-01 226 return pte_write(pte) ? (HMM_PFN_VALID | HMM_PFN_WRITE) : HMM_PFN_VALID;
2aee09d8c11642 Jérôme Glisse 2018-04-10 227 }
2aee09d8c11642 Jérôme Glisse 2018-04-10 228
53f5c3f489ecdd Jérôme Glisse 2018-04-10 229 static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
53f5c3f489ecdd Jérôme Glisse 2018-04-10 230 unsigned long end, pmd_t *pmdp, pte_t *ptep,
2733ea144dcce7 Jason Gunthorpe 2020-05-01 231 unsigned long *hmm_pfn)
53f5c3f489ecdd Jérôme Glisse 2018-04-10 232 {
53f5c3f489ecdd Jérôme Glisse 2018-04-10 233 struct hmm_vma_walk *hmm_vma_walk = walk->private;
f88a1e90c66540 Jérôme Glisse 2018-04-10 234 struct hmm_range *range = hmm_vma_walk->range;
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 235 unsigned int required_fault;
2733ea144dcce7 Jason Gunthorpe 2020-05-01 236 unsigned long cpu_flags;
da4c3c735ea4dc Jérôme Glisse 2017-09-08 237 pte_t pte = *ptep;
2733ea144dcce7 Jason Gunthorpe 2020-05-01 238 uint64_t pfn_req_flags = *hmm_pfn;
da4c3c735ea4dc Jérôme Glisse 2017-09-08 239
74eee180b935fc Jérôme Glisse 2017-09-08 240 if (pte_none(pte)) {
2733ea144dcce7 Jason Gunthorpe 2020-05-01 241 required_fault =
2733ea144dcce7 Jason Gunthorpe 2020-05-01 242 hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 243 if (required_fault)
74eee180b935fc Jérôme Glisse 2017-09-08 244 goto fault;
2733ea144dcce7 Jason Gunthorpe 2020-05-01 245 *hmm_pfn = 0;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 246 return 0;
74eee180b935fc Jérôme Glisse 2017-09-08 247 }
74eee180b935fc Jérôme Glisse 2017-09-08 248
74eee180b935fc Jérôme Glisse 2017-09-08 249 if (!pte_present(pte)) {
8d63e4cd62b258 Ralph Campbell 2018-01-31 @250 swp_entry_t entry = pte_to_swp_entry(pte);
74eee180b935fc Jérôme Glisse 2017-09-08 251
74eee180b935fc Jérôme Glisse 2017-09-08 252 /*
0cb80a2fb5bcd1 Randy Dunlap 2020-08-11 253 * Never fault in device private pages, but just report
17ffdc482982af Christoph Hellwig 2020-03-16 254 * the PFN even if not present.
74eee180b935fc Jérôme Glisse 2017-09-08 255 */
08ddddda667b3b Christoph Hellwig 2020-03-16 256 if (hmm_is_device_private_entry(range, entry)) {
2733ea144dcce7 Jason Gunthorpe 2020-05-01 257 cpu_flags = HMM_PFN_VALID;
17ffdc482982af Christoph Hellwig 2020-03-16 @258 if (is_write_device_private_entry(entry))
2733ea144dcce7 Jason Gunthorpe 2020-05-01 259 cpu_flags |= HMM_PFN_WRITE;
2733ea144dcce7 Jason Gunthorpe 2020-05-01 @260 *hmm_pfn = device_private_entry_to_pfn(entry) |
2733ea144dcce7 Jason Gunthorpe 2020-05-01 261 cpu_flags;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 262 return 0;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 263 }
53f5c3f489ecdd Jérôme Glisse 2018-04-10 264
2733ea144dcce7 Jason Gunthorpe 2020-05-01 265 required_fault =
2733ea144dcce7 Jason Gunthorpe 2020-05-01 266 hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
846babe85efdda Jason Gunthorpe 2020-03-27 267 if (!required_fault) {
2733ea144dcce7 Jason Gunthorpe 2020-05-01 268 *hmm_pfn = 0;
76612d6ce4ccd2 Jason Gunthorpe 2020-02-28 269 return 0;
846babe85efdda Jason Gunthorpe 2020-03-27 270 }
76612d6ce4ccd2 Jason Gunthorpe 2020-02-28 271
76612d6ce4ccd2 Jason Gunthorpe 2020-02-28 @272 if (!non_swap_entry(entry))
76612d6ce4ccd2 Jason Gunthorpe 2020-02-28 273 goto fault;
76612d6ce4ccd2 Jason Gunthorpe 2020-02-28 274
53f5c3f489ecdd Jérôme Glisse 2018-04-10 @275 if (is_migration_entry(entry)) {
74eee180b935fc Jérôme Glisse 2017-09-08 @276 pte_unmap(ptep);
74eee180b935fc Jérôme Glisse 2017-09-08 277 hmm_vma_walk->last = addr;
d2e8d551165ccb Ralph Campbell 2019-07-25 @278 migration_entry_wait(walk->mm, pmdp, addr);
73231612dc7c90 Jérôme Glisse 2019-05-13 279 return -EBUSY;
74eee180b935fc Jérôme Glisse 2017-09-08 280 }
53f5c3f489ecdd Jérôme Glisse 2018-04-10 281
53f5c3f489ecdd Jérôme Glisse 2018-04-10 282 /* Report error for everything else */
dfdc22078f3f06 Jason Gunthorpe 2020-02-28 283 pte_unmap(ptep);
53f5c3f489ecdd Jérôme Glisse 2018-04-10 284 return -EFAULT;
da4c3c735ea4dc Jérôme Glisse 2017-09-08 285 }
da4c3c735ea4dc Jérôme Glisse 2017-09-08 286
76612d6ce4ccd2 Jason Gunthorpe 2020-02-28 287 cpu_flags = pte_to_hmm_pfn_flags(range, pte);
2733ea144dcce7 Jason Gunthorpe 2020-05-01 288 required_fault =
2733ea144dcce7 Jason Gunthorpe 2020-05-01 289 hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, cpu_flags);
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 290 if (required_fault)
74eee180b935fc Jérôme Glisse 2017-09-08 291 goto fault;
74eee180b935fc Jérôme Glisse 2017-09-08 292
ac541f25037229 Ralph Campbell 2019-10-23 293 /*
40550627492291 Jason Gunthorpe 2020-03-05 294 * Since each architecture defines a struct page for the zero page, just
40550627492291 Jason Gunthorpe 2020-03-05 295 * fall through and treat it like a normal page.
ac541f25037229 Ralph Campbell 2019-10-23 296 */
40550627492291 Jason Gunthorpe 2020-03-05 297 if (pte_special(pte) && !is_zero_pfn(pte_pfn(pte))) {
2733ea144dcce7 Jason Gunthorpe 2020-05-01 298 if (hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0)) {
40550627492291 Jason Gunthorpe 2020-03-05 299 pte_unmap(ptep);
40550627492291 Jason Gunthorpe 2020-03-05 300 return -EFAULT;
40550627492291 Jason Gunthorpe 2020-03-05 301 }
2733ea144dcce7 Jason Gunthorpe 2020-05-01 302 *hmm_pfn = HMM_PFN_ERROR;
40550627492291 Jason Gunthorpe 2020-03-05 303 return 0;
ac541f25037229 Ralph Campbell 2019-10-23 304 }
992de9a8b75116 Jérôme Glisse 2019-05-13 305
2733ea144dcce7 Jason Gunthorpe 2020-05-01 306 *hmm_pfn = pte_pfn(pte) | cpu_flags;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 307 return 0;
74eee180b935fc Jérôme Glisse 2017-09-08 308
74eee180b935fc Jérôme Glisse 2017-09-08 309 fault:
74eee180b935fc Jérôme Glisse 2017-09-08 310 pte_unmap(ptep);
5504ed29692faa Jérôme Glisse 2018-04-10 311 /* Fault any virtual address we were asked to fault */
a3eb13c1579ba9 Jason Gunthorpe 2020-03-27 312 return hmm_vma_fault(addr, end, required_fault, walk);
53f5c3f489ecdd Jérôme Glisse 2018-04-10 313 }
53f5c3f489ecdd Jérôme Glisse 2018-04-10 314
53f5c3f489ecdd Jérôme Glisse 2018-04-10 315 static int hmm_vma_walk_pmd(pmd_t *pmdp,
53f5c3f489ecdd Jérôme Glisse 2018-04-10 316 unsigned long start,
53f5c3f489ecdd Jérôme Glisse 2018-04-10 317 unsigned long end,
53f5c3f489ecdd Jérôme Glisse 2018-04-10 318 struct mm_walk *walk)
53f5c3f489ecdd Jérôme Glisse 2018-04-10 319 {
53f5c3f489ecdd Jérôme Glisse 2018-04-10 320 struct hmm_vma_walk *hmm_vma_walk = walk->private;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 321 struct hmm_range *range = hmm_vma_walk->range;
2733ea144dcce7 Jason Gunthorpe 2020-05-01 322 unsigned long *hmm_pfns =
2733ea144dcce7 Jason Gunthorpe 2020-05-01 323 &range->hmm_pfns[(start - range->start) >> PAGE_SHIFT];
2288a9a68175ce Jason Gunthorpe 2020-03-05 324 unsigned long npages = (end - start) >> PAGE_SHIFT;
2288a9a68175ce Jason Gunthorpe 2020-03-05 325 unsigned long addr = start;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 326 pte_t *ptep;
d08faca018c461 Jérôme Glisse 2018-10-30 327 pmd_t pmd;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 328
53f5c3f489ecdd Jérôme Glisse 2018-04-10 329 again:
d08faca018c461 Jérôme Glisse 2018-10-30 330 pmd = READ_ONCE(*pmdp);
d08faca018c461 Jérôme Glisse 2018-10-30 331 if (pmd_none(pmd))
b7a16c7ad790d0 Steven Price 2020-02-03 332 return hmm_vma_walk_hole(start, end, -1, walk);
53f5c3f489ecdd Jérôme Glisse 2018-04-10 333
d08faca018c461 Jérôme Glisse 2018-10-30 @334 if (thp_migration_supported() && is_pmd_migration_entry(pmd)) {
2733ea144dcce7 Jason Gunthorpe 2020-05-01 335 if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0)) {
d08faca018c461 Jérôme Glisse 2018-10-30 336 hmm_vma_walk->last = addr;
d2e8d551165ccb Ralph Campbell 2019-07-25 @337 pmd_migration_entry_wait(walk->mm, pmdp);
73231612dc7c90 Jérôme Glisse 2019-05-13 338 return -EBUSY;
d08faca018c461 Jérôme Glisse 2018-10-30 339 }
2733ea144dcce7 Jason Gunthorpe 2020-05-01 340 return hmm_pfns_fill(start, end, range, 0);
2288a9a68175ce Jason Gunthorpe 2020-03-05 341 }
2288a9a68175ce Jason Gunthorpe 2020-03-05 342
2288a9a68175ce Jason Gunthorpe 2020-03-05 343 if (!pmd_present(pmd)) {
2733ea144dcce7 Jason Gunthorpe 2020-05-01 344 if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0))
2288a9a68175ce Jason Gunthorpe 2020-03-05 345 return -EFAULT;
d28c2c9a487708 Ralph Campbell 2019-11-04 346 return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
2288a9a68175ce Jason Gunthorpe 2020-03-05 347 }
d08faca018c461 Jérôme Glisse 2018-10-30 348
d08faca018c461 Jérôme Glisse 2018-10-30 @349 if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) {
53f5c3f489ecdd Jérôme Glisse 2018-04-10 350 /*
d2e8d551165ccb Ralph Campbell 2019-07-25 351 * No need to take pmd_lock here, even if some other thread
53f5c3f489ecdd Jérôme Glisse 2018-04-10 352 * is splitting the huge pmd we will get that event through
53f5c3f489ecdd Jérôme Glisse 2018-04-10 353 * mmu_notifier callback.
53f5c3f489ecdd Jérôme Glisse 2018-04-10 354 *
d2e8d551165ccb Ralph Campbell 2019-07-25 355 * So just read pmd value and check again it's a transparent
53f5c3f489ecdd Jérôme Glisse 2018-04-10 356 * huge or device mapping one and compute corresponding pfn
53f5c3f489ecdd Jérôme Glisse 2018-04-10 357 * values.
53f5c3f489ecdd Jérôme Glisse 2018-04-10 358 */
53f5c3f489ecdd Jérôme Glisse 2018-04-10 @359 pmd = pmd_read_atomic(pmdp);
53f5c3f489ecdd Jérôme Glisse 2018-04-10 360 barrier();
53f5c3f489ecdd Jérôme Glisse 2018-04-10 361 if (!pmd_devmap(pmd) && !pmd_trans_huge(pmd))
53f5c3f489ecdd Jérôme Glisse 2018-04-10 362 goto again;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 363
2733ea144dcce7 Jason Gunthorpe 2020-05-01 364 return hmm_vma_handle_pmd(walk, addr, end, hmm_pfns, pmd);
53f5c3f489ecdd Jérôme Glisse 2018-04-10 365 }
53f5c3f489ecdd Jérôme Glisse 2018-04-10 366
d08faca018c461 Jérôme Glisse 2018-10-30 367 /*
d2e8d551165ccb Ralph Campbell 2019-07-25 368 * We have handled all the valid cases above ie either none, migration,
d08faca018c461 Jérôme Glisse 2018-10-30 369 * huge or transparent huge. At this point either it is a valid pmd
d08faca018c461 Jérôme Glisse 2018-10-30 370 * entry pointing to pte directory or it is a bad pmd that will not
d08faca018c461 Jérôme Glisse 2018-10-30 371 * recover.
d08faca018c461 Jérôme Glisse 2018-10-30 372 */
2288a9a68175ce Jason Gunthorpe 2020-03-05 373 if (pmd_bad(pmd)) {
2733ea144dcce7 Jason Gunthorpe 2020-05-01 374 if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0))
2288a9a68175ce Jason Gunthorpe 2020-03-05 375 return -EFAULT;
d28c2c9a487708 Ralph Campbell 2019-11-04 376 return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
2288a9a68175ce Jason Gunthorpe 2020-03-05 377 }
53f5c3f489ecdd Jérôme Glisse 2018-04-10 378
53f5c3f489ecdd Jérôme Glisse 2018-04-10 379 ptep = pte_offset_map(pmdp, addr);
2733ea144dcce7 Jason Gunthorpe 2020-05-01 380 for (; addr < end; addr += PAGE_SIZE, ptep++, hmm_pfns++) {
53f5c3f489ecdd Jérôme Glisse 2018-04-10 381 int r;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 382
2733ea144dcce7 Jason Gunthorpe 2020-05-01 383 r = hmm_vma_handle_pte(walk, addr, end, pmdp, ptep, hmm_pfns);
53f5c3f489ecdd Jérôme Glisse 2018-04-10 384 if (r) {
dfdc22078f3f06 Jason Gunthorpe 2020-02-28 385 /* hmm_vma_handle_pte() did pte_unmap() */
53f5c3f489ecdd Jérôme Glisse 2018-04-10 386 return r;
53f5c3f489ecdd Jérôme Glisse 2018-04-10 387 }
da4c3c735ea4dc Jérôme Glisse 2017-09-08 388 }
da4c3c735ea4dc Jérôme Glisse 2017-09-08 389 pte_unmap(ptep - 1);
da4c3c735ea4dc Jérôme Glisse 2017-09-08 390 return 0;
da4c3c735ea4dc Jérôme Glisse 2017-09-08 391 }
da4c3c735ea4dc Jérôme Glisse 2017-09-08 392

:::::: The code at line 177 was first introduced by commit
:::::: 2aee09d8c1164219971c7b396f2235bd5334018c mm/hmm: change hmm_vma_fault() to allow write fault on page basis

:::::: TO: Jérôme Glisse <jglisse@xxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

---
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