Per ACPI spec r6.0, sec 6.4.3.5.1, 2, 3, Bit [0] of General Flags (the Consumer/Producer bit) should be ignored for QWord/DWord/Word Address Space descriptors. The Consumer/Producer bit is defined only for the Extended Address Space descriptor.
Ignore Consumer/Producer except for Extended Address Space descriptors. Note that for QWord/DWord/Word descriptors, we previously applied the translation offset (_TRA) only when the Consumer/Producer bit was set. This patch changes that: for those descriptors, we ignore Consumer/Producer and always apply the translation offset. Signed-off-by: Bjorn Helgaas <bhelg...@google.com> --- drivers/acpi/resource.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c index 2732d39e..b45cd8f 100644 --- a/drivers/acpi/resource.c +++ b/drivers/acpi/resource.c @@ -261,11 +261,16 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares, * primary side. Non-bridge devices must list 0 for all Address * Translation offset bits. */ - if (addr->producer_consumer == ACPI_PRODUCER) + if (ares->type == ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64) { + if (addr->producer_consumer == ACPI_PRODUCER) + offset = attr->translation_offset; + else if (attr->translation_offset) + pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n", + attr->translation_offset); + } else { offset = attr->translation_offset; - else if (attr->translation_offset) - pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n", - attr->translation_offset); + } + start = attr->minimum + offset; end = attr->maximum + offset; @@ -294,7 +299,8 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares, return false; } - if (addr->producer_consumer == ACPI_PRODUCER) + if (ares->type == ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64 && + addr->producer_consumer == ACPI_PRODUCER) res->flags |= IORESOURCE_WINDOW; if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)