I hope am not messing something up,...
The Linux AMD IOMMU driver does not seem to be applying DTE settings listed in
the ALL field correctly.
The relevant code:
switch (e->type) {
case IVHD_DEV_ALL:
DUMP_printk(" DEV_ALL\t\t\t first devid: %02x:%02x.%x"
" last device %02x:%02x.%x flags: %02x\n",
PCI_BUS_NUM(iommu->first_device),
PCI_SLOT(iommu->first_device),
PCI_FUNC(iommu->first_device),
PCI_BUS_NUM(iommu->last_device),
PCI_SLOT(iommu->last_device),
PCI_FUNC(iommu->last_device),
e->flags);
for (dev_i = iommu->first_device;
dev_i <= iommu->last_device; ++dev_i)
set_dev_entry_from_acpi(iommu, dev_i,
e->flags, 0);
break;
case IVHD_DEV_SELECT:
Basically, the iommu->last/first_device fields are initialized in another state
of the driver much later in the code(during PCI initialization); the values
iommu->first/last_device are used before initialization which breaks the logic
of this code.
On the other hand, this might be a lame bug as I have not seen any IOMMU using
the ALL settings but I haven't seen many.
Cheers,
David.
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