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get_irq_table() previously acquired amd_iommu_devtable_lock which is not a raw lock, and thus cannot be acquired from atomic context on PREEMPT_RT. Many calls to modify_irte*() come from atomic context due to the IRQ desc->lock, as does amd_iommu_update_ga() due to the preemption disabling in vcpu_load/put(). The only difference between calling get_irq_table() and reading from irq_lookup_table[] directly, other than the lock acquisition and amd_iommu_rlookup_table[] check, is if the table entry is unpopulated, which should never happen when looking up a devid that came from an irq_2_irte struct, as get_irq_table() would have already been called on that devid during irq_remapping_alloc(). The lock acquisition is not needed in these cases because entries in irq_lookup_table[] never change once non-NULL -- nor would the amd_iommu_devtable_lock usage in get_irq_table() provide meaningful protection if they did, since it's released before using the looked up table in the get_irq_table() caller. Rename the old get_irq_table() to alloc_irq_table(), and create a new lockless get_irq_table() to be used in non-allocating contexts that WARNs if it doesn't find what it's looking for. Signed-off-by: Scott Wood <swood@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.