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    Subject[RFC PATCH 5/6] iommu/arm-smmu-v3: fix panic when handle stall mode irq
    Date
    When SMMU do not support SVM feature, however the master support SVM,
    which means matser can stall and with mult-pasid number, then the user
    can bind a task to device using API like iommu_bind_task(). however,
    when device trigger a stall mode fault i will cause panic:

    [ 106.996087] Unable to handle kernel NULL pointer dereference at virtual address 00000100
    [ 106.996122] user pgtable: 4k pages, 48-bit VAs, pgd = ffff80003e023000
    [ 106.996150] [0000000000000100] *pgd=000000003e04a003, *pud=000000003e04b003, *pmd=0000000000000000
    [ 106.996201] Internal error: Oops: 96000006 [#1] PREEMPT SM
    [ 106.996224] Modules linked in:
    [ 106.996256] CPU: 0 PID: 916 Comm: irq/14-arm-smmu Not tainted 4.13.0-rc5-00035-g1235ddd-dirty #67
    [ 106.996288] Hardware name: Hisilicon PhosphorHi1383 ESL (DT)
    [ 106.996317] task: ffff80003adc1c00 task.stack: ffff80003a9f8000
    [ 106.996347] PC is at __queue_work+0x30/0x3a8
    [ 106.996374] LR is at queue_work_on+0x60/0x78
    [ 106.996401] pc : [<ffff0000080d7d10>] lr : [<ffff0000080d80e8>] pstate: 40c001c9
    [ 106.996430] sp : ffff80003a9fbc20
    [ 106.996451] x29: ffff80003a9fbc20 x28: ffff80003adc1c00
    [ 106.996488] x27: ffff000008d05080 x26: ffff80003ab0e028
    [ 106.996526] x25: ffff80003a9900ac x24: 0000000000000001
    [ 106.996562] x23: 0000000000000040 x22: 0000000000000000
    [ 106.996598] x21: 0000000000000000 x20: 0000000000000140
    [ 106.996634] x19: ffff80003ab0e028 x18: 0000000000000010
    [ 106.996670] x17: 0000ffffa52a5040 x16: ffff00000820f260
    [ 106.996708] x15: 00000018e97629e0 x14: ffff80003fb89468
    [ 106.996744] x13: 0000000000000000 x12: ffff80003abb0600
    [ 106.996781] x11: 0000000000000000 x10: 0000010100000100
    [ 106.996817] x9 : 0000ffff85de5010 x8 : 00000000e4830001
    [ 106.996854] x7 : ffff80003a9fbcf8 x6 : 0000000fffffffe0
    [ 106.996890] x5 : 0000000000000000 x4 : 0000000000000001
    [ 106.996926] x3 : 0000000000000000 x2 : ffff80003ab0e028
    [ 106.996962] x1 : 0000000000000000 x0 : 00000000000001c0
    [ 106.997002] Process irq/14-arm-smmu (pid: 916, stack limit =0xffff80003a9f8000)
    [ 106.997035] Stack: (0xffff80003a9fbc20 to 0xffff80003a9fc000)
    [...]
    [ 106.998366] Call trace:
    [ 106.998842] [<ffff0000080d7d10>] __queue_work+0x30/0x3a8
    [ 106.998874] [<ffff0000080d80e8>] queue_work_on+0x60/0x78
    [ 106.998912] [<ffff00000857aae4>] arm_smmu_handle_stall+0x104/0x138
    [ 106.998952] [<ffff00000857b150>] arm_smmu_evtq_thread+0xc0/0x158
    [ 106.998989] [<ffff000008112128>] irq_thread_fn+0x28/0x68
    [ 106.999025] [<ffff0000081123e0>] irq_thread+0x128/0x1d0
    [ 106.999060] [<ffff0000080df6bc>] kthread+0xfc/0x128
    [ 106.999093] [<ffff000008082ec0>] ret_from_fork+0x10/0x50
    [ 106.999130] Code: a90153f3 a90573fb d53b4220 363814c0 (b94102a0)
    [ 106.999159] ---[ end trace 7e5c9f0cb1f2fecd ]---

    And the resean is we donot init fault_queue while the fault handle need
    to use it. Fix by return -EINVAL in arm_smmu_bind_task() when smmu do not
    support the feature of SVM.

    Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
    ---
    drivers/iommu/arm-smmu-v3.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
    index d44256a..dbda2eb 100644
    --- a/drivers/iommu/arm-smmu-v3.c
    +++ b/drivers/iommu/arm-smmu-v3.c
    @@ -2922,6 +2922,8 @@ static int arm_smmu_bind_task(struct device *dev, struct task_struct *task,
    return -EINVAL;

    smmu = master->smmu;
    + if (!(smmu->features & ARM_SMMU_FEAT_SVM))
    + return -EINVAL;

    domain = iommu_get_domain_for_dev(dev);
    if (WARN_ON(!domain))
    --
    1.7.12.4
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