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Commit 02acc43a authored by Joerg Roedel's avatar Joerg Roedel
Browse files

amd-iommu: print ivmd information to dmesg when requested 



Add information about device memory mapping requirements for the IOMMU
as described in the IVRS ACPI table to the kernel log if amd_iommu_dump
was specified on the kernel command line.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 42a698f4

arch/x86/kernel/amd_iommu_init.c

+11 −0
Original line number Diff line number Diff line
@@ -983,6 +983,7 @@ static int __init init_exclusion_range(struct ivmd_header *m) 
static int __init init_unity_map_range(struct ivmd_header *m)

{

	struct unity_map_entry *e = 0;

	char *s;



	e = kzalloc(sizeof(*e), GFP_KERNEL);

	if (e == NULL)
@@ -991,13 +992,16 @@ static int __init init_unity_map_range(struct ivmd_header *m) 
	switch (m->type) {

	default:

	case ACPI_IVMD_TYPE:

		s = "IVMD_TYPEi\t\t\t";

		e->devid_start = e->devid_end = m->devid;

		break;

	case ACPI_IVMD_TYPE_ALL:

		s = "IVMD_TYPE_ALL\t\t";

		e->devid_start = 0;

		e->devid_end = amd_iommu_last_bdf;

		break;

	case ACPI_IVMD_TYPE_RANGE:

		s = "IVMD_TYPE_RANGE\t\t";

		e->devid_start = m->devid;

		e->devid_end = m->aux;

		break;
@@ -1006,6 +1010,13 @@ static int __init init_unity_map_range(struct ivmd_header *m) 
	e->address_end = e->address_start + PAGE_ALIGN(m->range_length);

	e->prot = m->flags >> 1;



	DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"

		    " range_start: %016llx range_end: %016llx flags: %x\n", s,

		    PCI_BUS(e->devid_start), PCI_SLOT(e->devid_start),

		    PCI_FUNC(e->devid_start), PCI_BUS(e->devid_end),

		    PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),

		    e->address_start, e->address_end, m->flags);



	list_add_tail(&e->list, &amd_iommu_unity_map);



	return 0;