Hi Will, Hi Robin, On Fri, Jan 10, 2020 at 03:28:52PM +0000, Will Deacon wrote: > From: Robin Murphy <robin.mur...@arm.com> > > Now that we can correctly extract top-level indices without relying on > the remaining upper bits being zero, the only remaining impediments to > using a given table for TTBR1 are the address validation on map/unmap > and the awkward TCR translation granule format. Add a quirk so that we > can do the right thing at those points. > > Tested-by: Jordan Crouse <jcro...@codeaurora.org> > Signed-off-by: Robin Murphy <robin.mur...@arm.com> > Signed-off-by: Will Deacon <w...@kernel.org> > --- > drivers/iommu/io-pgtable-arm.c | 25 +++++++++++++++++++------ > include/linux/io-pgtable.h | 4 ++++ > 2 files changed, 23 insertions(+), 6 deletions(-) > > diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c > index 846963c87e0f..5e966ef0bacf 100644 > --- a/drivers/iommu/io-pgtable-arm.c > +++ b/drivers/iommu/io-pgtable-arm.c > @@ -104,6 +104,10 @@ > #define ARM_LPAE_TCR_TG0_64K 1 > #define ARM_LPAE_TCR_TG0_16K 2 > > +#define ARM_LPAE_TCR_TG1_16K 1 > +#define ARM_LPAE_TCR_TG1_4K 2 > +#define ARM_LPAE_TCR_TG1_64K 3 > + > #define ARM_LPAE_TCR_SH_NS 0 > #define ARM_LPAE_TCR_SH_OS 2 > #define ARM_LPAE_TCR_SH_IS 3 > @@ -463,6 +467,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, > unsigned long iova, > arm_lpae_iopte *ptep = data->pgd; > int ret, lvl = data->start_level; > arm_lpae_iopte prot; > + long iaext = (long)iova >> cfg->ias; > > /* If no access, then nothing to do */ > if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) > @@ -471,7 +476,9 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, > unsigned long iova, > if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) > return -EINVAL; > > - if (WARN_ON(iova >> data->iop.cfg.ias || paddr >> data->iop.cfg.oas)) > + if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1) > + iaext = ~iaext; > + if (WARN_ON(iaext || paddr >> cfg->oas)) > return -ERANGE; > > prot = arm_lpae_prot_to_pte(data, iommu_prot); > @@ -637,11 +644,14 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops > *ops, unsigned long iova, > struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); > struct io_pgtable_cfg *cfg = &data->iop.cfg; > arm_lpae_iopte *ptep = data->pgd; > + long iaext = (long)iova >> cfg->ias; > > if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) > return 0; > > - if (WARN_ON(iova >> data->iop.cfg.ias)) > + if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1) > + iaext = ~iaext; > + if (WARN_ON(iaext)) > return 0; > > return __arm_lpae_unmap(data, gather, iova, size, data->start_level, > ptep);
This part of the patch seems to break io-pgtable-arm.c on ARM32 to some extent. I have a device using qcom_iommu that could normally run ARM64, but I'm unable to because of outdated (signed) firmware. :( So it's running a lot of code that would normally run only on ARM64. It used to work quite well but now qcom-venus fails to probe on: if (WARN_ON(iaext || paddr >> cfg->oas)) (I added some debug prints for clarity.) qcom-venus 1d00000.video-codec: Adding to iommu group 0 arm-lpae io-pgtable: quirks: 0x0 arm-lpae io-pgtable: arm_lpae_map: iova: 0xdd800000, paddr: 0xebe3f000, iaext: 0xffffffff, paddr >> oas: 0x0 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 954 at drivers/iommu/io-pgtable-arm.c:487 arm_lpae_map+0xe4/0x510 Hardware name: Generic DT based system ... [<c04bafb0>] (arm_lpae_map) from [<c04bcd6c>] (qcom_iommu_map+0x50/0x78) [<c04bcd6c>] (qcom_iommu_map) from [<c04b7290>] (__iommu_map+0xe8/0x1cc) [<c04b7290>] (__iommu_map) from [<c04b7bbc>] (__iommu_map_sg+0xa8/0x118) [<c04b7bbc>] (__iommu_map_sg) from [<c04b7c64>] (iommu_map_sg_atomic+0x18/0x20) [<c04b7c64>] (iommu_map_sg_atomic) from [<c04b94f8>] (iommu_dma_alloc+0x4dc/0x5a0) [<c04b94f8>] (iommu_dma_alloc) from [<c0196a50>] (dma_alloc_attrs+0x104/0x114) [<c0196a50>] (dma_alloc_attrs) from [<bf302c60>] (venus_hfi_create+0xa4/0x260 [venus_core]) [<bf302c60>] (venus_hfi_create [venus_core]) from [<bf2fe6cc>] (venus_probe+0x1e4/0x328 [venus_core]) [<bf2fe6cc>] (venus_probe [venus_core]) from [<c04c8eb4>] (platform_drv_probe+0x48/0x98) ... Exception stack(0xc2587fa8 to 0xc2587ff0) 7fa0: b6f3dc70 b5051010 b5051010 0017388c b6e645b0 b6e645b0 7fc0: b6f3dc70 b5051010 00020000 00000080 b6e30790 be84ea54 0046ac91 00000000 7fe0: b6e75f1c be84e940 b6e5fb51 b6eec8a4 ---[ end trace 2a0ed284f6d82f16 ]--- qcom-venus: probe of 1d00000.video-codec failed with error -12 Note that iaext = 0xffffffff != 0. It seems to be some int/long size problem that only happens with larger iova addresses on 32-bit systems. Without the (long) cast for iova everything is working correctly again: diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 983b08477e64..f7ecc763c706 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -468,7 +468,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, arm_lpae_iopte *ptep = data->pgd; int ret, lvl = data->start_level; arm_lpae_iopte prot; - long iaext = (long)iova >> cfg->ias; + long iaext = iova >> cfg->ias; /* If no access, then nothing to do */ if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) @@ -645,7 +645,7 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); struct io_pgtable_cfg *cfg = &data->iop.cfg; arm_lpae_iopte *ptep = data->pgd; - long iaext = (long)iova >> cfg->ias; + long iaext = iova >> cfg->ias; if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return 0; But I'm not sure if this is really the correct "fix"... This problem can be also easily reproduced by enabling IOMMU_IO_PGTABLE_LPAE_SELFTEST on ARM32. (Shouldn't there be some system that runs these automatically? ;)) Without this patch all of them are passing: arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 32 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 36 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 40 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 42 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 44 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 48 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 32 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 36 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 40 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 42 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 44 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 48 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 32 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 36 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 40 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 42 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 44 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 48 arm-lpae io-pgtable: selftest: completed with 18 PASS 0 FAIL But with this patch 6 of them are failing (with a similar warning as I posted above): arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 32 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 1 at drivers/iommu/io-pgtable-arm.c:482 arm_lpae_map+0xa4/0x4e4 Hardware name: Generic DT based system [<c01104ac>] (unwind_backtrace) from [<c010c0b4>] (show_stack+0x10/0x14) [<c010c0b4>] (show_stack) from [<c06cfb34>] (dump_stack+0x90/0xa4) [<c06cfb34>] (dump_stack) from [<c012d76c>] (__warn+0xb8/0xd4) [<c012d76c>] (__warn) from [<c012d7ec>] (warn_slowpath_fmt+0x64/0xbc) [<c012d7ec>] (warn_slowpath_fmt) from [<c04baf70>] (arm_lpae_map+0xa4/0x4e4) [<c04baf70>] (arm_lpae_map) from [<c0a1de3c>] (arm_lpae_do_selftests+0x234/0x688) [<c0a1de3c>] (arm_lpae_do_selftests) from [<c0102788>] (do_one_initcall+0x50/0x1b8) [<c0102788>] (do_one_initcall) from [<c0a0148c>] (kernel_init_freeable+0x1ec/0x25c) [<c0a0148c>] (kernel_init_freeable) from [<c06e6dc4>] (kernel_init+0x8/0x110) [<c06e6dc4>] (kernel_init) from [<c01010e8>] (ret_from_fork+0x14/0x2c) Exception stack(0xee867fb0 to 0xee867ff8) 7fa0: 00000000 00000000 00000000 00000000 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ---[ end trace 89e831c50a111e7c ]--- ------------[ cut here ]------------ WARNING: CPU: 3 PID: 1 at drivers/iommu/io-pgtable-arm.c:1182 arm_lpae_do_selftests+0x4b8/0x688 selftest: test failed for fmt idx 0 Hardware name: Generic DT based system [<c01104ac>] (unwind_backtrace) from [<c010c0b4>] (show_stack+0x10/0x14) [<c010c0b4>] (show_stack) from [<c06cfb34>] (dump_stack+0x90/0xa4) [<c06cfb34>] (dump_stack) from [<c012d76c>] (__warn+0xb8/0xd4) [<c012d76c>] (__warn) from [<c012d820>] (warn_slowpath_fmt+0x98/0xbc) [<c012d820>] (warn_slowpath_fmt) from [<c0a1e0c0>] (arm_lpae_do_selftests+0x4b8/0x688) [<c0a1e0c0>] (arm_lpae_do_selftests) from [<c0102788>] (do_one_initcall+0x50/0x1b8) [<c0102788>] (do_one_initcall) from [<c0a0148c>] (kernel_init_freeable+0x1ec/0x25c) [<c0a0148c>] (kernel_init_freeable) from [<c06e6dc4>] (kernel_init+0x8/0x110) [<c06e6dc4>] (kernel_init) from [<c01010e8>] (ret_from_fork+0x14/0x2c) Exception stack(0xee867fb0 to 0xee867ff8) 7fa0: 00000000 00000000 00000000 00000000 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ---[ end trace 89e831c50a111e7d ]--- arm-lpae io-pgtable: cfg: pgsize_bitmap 0x40201000, ias 32-bit arm-lpae io-pgtable: data: 3 levels, 0x20 pgd_size, 12 pg_shift, 9 bits_per_level, pgd @ (ptrval) arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 36 [warning as above] arm-lpae io-pgtable: cfg: pgsize_bitmap 0x40201000, ias 36-bit arm-lpae io-pgtable: data: 3 levels, 0x200 pgd_size, 12 pg_shift, 9 bits_per_level, pgd @ (ptrval) arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 40 [warning as above] arm-lpae io-pgtable: cfg: pgsize_bitmap 0x40201000, ias 40-bit arm-lpae io-pgtable: data: 4 levels, 0x10 pgd_size, 12 pg_shift, 9 bits_per_level, pgd @ (ptrval) arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 42 [warning as above] arm-lpae io-pgtable: cfg: pgsize_bitmap 0x40201000, ias 42-bit arm-lpae io-pgtable: data: 4 levels, 0x40 pgd_size, 12 pg_shift, 9 bits_per_level, pgd @ (ptrval) arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 44 [warning as above] arm-lpae io-pgtable: cfg: pgsize_bitmap 0x40201000, ias 44-bit arm-lpae io-pgtable: data: 4 levels, 0x100 pgd_size, 12 pg_shift, 9 bits_per_level, pgd @ (ptrval) arm-lpae io-pgtable: selftest: pgsize_bitmap 0x40201000, IAS 48 [warning as above] arm-lpae io-pgtable: cfg: pgsize_bitmap 0x40201000, ias 48-bit arm-lpae io-pgtable: data: 4 levels, 0x1000 pgd_size, 12 pg_shift, 9 bits_per_level, pgd @ (ptrval) arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 32 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 36 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 40 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 42 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 44 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x02004000, IAS 48 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 32 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 36 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 40 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 42 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 44 arm-lpae io-pgtable: selftest: pgsize_bitmap 0x20010000, IAS 48 arm-lpae io-pgtable: selftest: completed with 12 PASS 6 FAIL Any suggestions how to fix this properly? Thanks, Stephan _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu