> Subject: [kbuild-all] Re: [PATCH v4 4/7] iommu/vt-d: Handle non-page aligned > address > > Hi Jacob, > > Thank you for the patch! Perhaps something to improve: > > [auto build test WARNING on iommu/next] > [also build test WARNING on linux/master linus/master v5.8-rc4 next-20200707] > [If your patch is applied to the wrong git tree, kindly drop us a note. > And when submitting patch, we suggest to use as documented in > https://git-scm.com/docs/git-format-patch] > > url: https://github.com/0day-ci/linux/commits/Jacob-Pan/iommu-vt-d-Misc- > tweaks-and-fixes-for-vSVA/20200707-081026 > base: https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next > config: x86_64-randconfig-m031-20200707 (attached as .config) > compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <l...@intel.com> > > All warnings (new ones prefixed by >>): Kindly ignore this, which is related to [-Wtype-limits], and is under discussion to move such warning from W=1 to W=2 as it may not suitable to fix which can hurt code readability.
Refer to https://lore.kernel.org/lkml/CAHk-=wiKCXEWKJ9dWUimGbrVRo_N2RosESUw8E7m9AEtyZcu=w...@mail.gmail.com/ for the discussion. > > In file included from include/linux/string.h:6, > from include/linux/uuid.h:12, > from include/linux/mod_devicetable.h:13, > from include/linux/pci.h:27, > from drivers/iommu/intel/dmar.c:19: > drivers/iommu/intel/dmar.c: In function 'qi_flush_dev_iotlb_pasid': > include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 > is > always false [-Wtype-limits] > 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) > | ^ > include/linux/compiler.h:58:52: note: in definition of macro > '__trace_if_var' > 58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : > __trace_if_value(cond)) > | ^~~~ > >> drivers/iommu/intel/dmar.c:1459:2: note: in expansion of macro 'if' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~ > include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' > 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ > | ^~~~~~~~~~~~~~~~~ > include/linux/bits.h:45:3: note: in expansion of macro > 'GENMASK_INPUT_CHECK' > 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) > | ^~~~~~~~~~~~~~~~~~~ > drivers/iommu/intel/dmar.c:1459:13: note: in expansion of macro > 'GENMASK_ULL' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~~~~~~~~~~ > include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 > is > always false [-Wtype-limits] > 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) > | ^ > include/linux/compiler.h:58:52: note: in definition of macro > '__trace_if_var' > 58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : > __trace_if_value(cond)) > | ^~~~ > >> drivers/iommu/intel/dmar.c:1459:2: note: in expansion of macro 'if' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~ > include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' > 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ > | ^~~~~~~~~~~~~~~~~ > include/linux/bits.h:45:3: note: in expansion of macro > 'GENMASK_INPUT_CHECK' > 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) > | ^~~~~~~~~~~~~~~~~~~ > drivers/iommu/intel/dmar.c:1459:13: note: in expansion of macro > 'GENMASK_ULL' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~~~~~~~~~~ > include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 > is > always false [-Wtype-limits] > 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) > | ^ > include/linux/compiler.h:58:61: note: in definition of macro > '__trace_if_var' > 58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : > __trace_if_value(cond)) > | ^~~~ > >> drivers/iommu/intel/dmar.c:1459:2: note: in expansion of macro 'if' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~ > include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' > 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ > | ^~~~~~~~~~~~~~~~~ > include/linux/bits.h:45:3: note: in expansion of macro > 'GENMASK_INPUT_CHECK' > 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) > | ^~~~~~~~~~~~~~~~~~~ > drivers/iommu/intel/dmar.c:1459:13: note: in expansion of macro > 'GENMASK_ULL' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~~~~~~~~~~ > include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 > is > always false [-Wtype-limits] > 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) > | ^ > include/linux/compiler.h:58:61: note: in definition of macro > '__trace_if_var' > 58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : > __trace_if_value(cond)) > | ^~~~ > >> drivers/iommu/intel/dmar.c:1459:2: note: in expansion of macro 'if' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~ > include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' > 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ > | ^~~~~~~~~~~~~~~~~ > include/linux/bits.h:45:3: note: in expansion of macro > 'GENMASK_INPUT_CHECK' > 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) > | ^~~~~~~~~~~~~~~~~~~ > drivers/iommu/intel/dmar.c:1459:13: note: in expansion of macro > 'GENMASK_ULL' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~~~~~~~~~~ > include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 > is > always false [-Wtype-limits] > 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) > | ^ > include/linux/compiler.h:69:3: note: in definition of macro > '__trace_if_value' > 69 | (cond) ? \ > | ^~~~ > include/linux/compiler.h:56:28: note: in expansion of macro > '__trace_if_var' > 56 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## > __VA_ARGS__) ) ) > | ^~~~~~~~~~~~~~ > >> drivers/iommu/intel/dmar.c:1459:2: note: in expansion of macro 'if' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~ > include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' > 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ > | ^~~~~~~~~~~~~~~~~ > include/linux/bits.h:45:3: note: in expansion of macro > 'GENMASK_INPUT_CHECK' > 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) > | ^~~~~~~~~~~~~~~~~~~ > drivers/iommu/intel/dmar.c:1459:13: note: in expansion of macro > 'GENMASK_ULL' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~~~~~~~~~~ > include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 > is > always false [-Wtype-limits] > 26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) > | ^ > include/linux/compiler.h:69:3: note: in definition of macro > '__trace_if_value' > 69 | (cond) ? \ > | ^~~~ > include/linux/compiler.h:56:28: note: in expansion of macro > '__trace_if_var' > 56 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## > __VA_ARGS__) ) ) > | ^~~~~~~~~~~~~~ > >> drivers/iommu/intel/dmar.c:1459:2: note: in expansion of macro 'if' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~ > include/linux/bits.h:25:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO' > 25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ > | ^~~~~~~~~~~~~~~~~ > include/linux/bits.h:45:3: note: in expansion of macro > 'GENMASK_INPUT_CHECK' > 45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) > | ^~~~~~~~~~~~~~~~~~~ > drivers/iommu/intel/dmar.c:1459:13: note: in expansion of macro > 'GENMASK_ULL' > 1459 | if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > | ^~~~~~~~~~~ > > vim +/if +1459 drivers/iommu/intel/dmar.c > > 1438 > 1439 /* PASID-based device IOTLB Invalidate */ > 1440 void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 > sid, u16 > pfsid, > 1441 u32 pasid, u16 qdep, u64 addr, > unsigned int > size_order) > 1442 { > 1443 unsigned long mask = 1UL << (VTD_PAGE_SHIFT + > size_order - > 1); > 1444 struct qi_desc desc = {.qw1 = 0, .qw2 = 0, .qw3 = 0}; > 1445 > 1446 desc.qw0 = QI_DEV_EIOTLB_PASID(pasid) | > QI_DEV_EIOTLB_SID(sid) | > 1447 QI_DEV_EIOTLB_QDEP(qdep) | QI_DEIOTLB_TYPE | > 1448 QI_DEV_IOTLB_PFSID(pfsid); > 1449 > 1450 /* > 1451 * If S bit is 0, we only flush a single page. If S bit > is set, > 1452 * The least significant zero bit indicates the > invalidation address > 1453 * range. VT-d spec 6.5.2.6. > 1454 * e.g. address bit 12[0] indicates 8KB, 13[0] > indicates 16KB. > 1455 * size order = 0 is PAGE_SIZE 4KB > 1456 * Max Invs Pending (MIP) is set to 0 for now until we > have DIT in > 1457 * ECAP. > 1458 */ > > 1459 if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0)) > 1460 pr_warn_ratelimited("Invalidate non-aligned > address %llx, > order %d\n", addr, size_order); > 1461 > 1462 /* Take page address */ > 1463 desc.qw1 = QI_DEV_EIOTLB_ADDR(addr); > 1464 > 1465 if (size_order) { > 1466 /* > 1467 * Existing 0s in address below size_order may > be the > least > 1468 * significant bit, we must set them to 1s to > avoid having > 1469 * smaller size than desired. > 1470 */ > 1471 desc.qw1 |= GENMASK_ULL(size_order + > VTD_PAGE_SHIFT, > 1472 VTD_PAGE_SHIFT); > 1473 /* Clear size_order bit to indicate size */ > 1474 desc.qw1 &= ~mask; > 1475 /* Set the S bit to indicate flushing more than > 1 page */ > 1476 desc.qw1 |= QI_DEV_EIOTLB_SIZE; > 1477 } > 1478 > 1479 qi_submit_sync(iommu, &desc, 1, 0); > 1480 } > 1481 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
