arm64: acpi: Prepare for longer MADTs
The BAD_MADT_GICC_ENTRY check is a little too strict because it rejects MADT entries that don't match the currently known lengths. We should remove this restriction to avoid problems if the table length changes. Future code which might depend on additional fields should be written to validate those fields before using them, rather than trying to globally check known MADT version lengths. Link: https://lkml.kernel.org/r/20181012192937.3819951-1-jeremy.linton@arm.com Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> [lorenzo.pieralisi@arm.com: added MADT macro comments] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Al Stone <ahs3@redhat.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -22,12 +22,23 @@
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#include <asm/tlbflush.h>
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/* Macros for consistency checks of the GICC subtable of MADT */
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#define ACPI_MADT_GICC_LENGTH \
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(acpi_gbl_FADT.header.revision < 6 ? 76 : 80)
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/*
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* MADT GICC minimum length refers to the MADT GICC structure table length as
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* defined in the earliest ACPI version supported on arm64, ie ACPI 5.1.
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*
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* The efficiency_class member was added to the
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* struct acpi_madt_generic_interrupt to represent the MADT GICC structure
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* "Processor Power Efficiency Class" field, added in ACPI 6.0 whose offset
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* is therefore used to delimit the MADT GICC structure minimum length
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* appropriately.
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*/
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#define ACPI_MADT_GICC_MIN_LENGTH ACPI_OFFSET( \
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struct acpi_madt_generic_interrupt, efficiency_class)
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#define BAD_MADT_GICC_ENTRY(entry, end) \
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(!(entry) || (entry)->header.length != ACPI_MADT_GICC_LENGTH || \
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(unsigned long)(entry) + ACPI_MADT_GICC_LENGTH > (end))
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(!(entry) || (entry)->header.length < ACPI_MADT_GICC_MIN_LENGTH || \
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(unsigned long)(entry) + (entry)->header.length > (end))
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/* Basic configuration for ACPI */
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#ifdef CONFIG_ACPI
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