Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3e8064ba authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
Browse files

x86, AMD IOMMU: add functions to find last possible PCI device for IOMMU 



This patch adds functions to find the last PCI bus/device/function the IOMMU
driver has to handle. This information is used later to allocate the memory for
the data structures.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 928abd25

arch/x86/kernel/amd_iommu_init.c

+79 −0
Original line number Diff line number Diff line
@@ -116,3 +116,82 @@ unsigned long *amd_iommu_pd_alloc_bitmap; 
static u32 dev_table_size;

static u32 alias_table_size;

static u32 rlookup_table_size;



static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)

{

	u32 cap;



	cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);

	UPDATE_LAST_BDF(DEVID(MMIO_GET_BUS(cap), MMIO_GET_LD(cap)));



	return 0;

}



static int __init find_last_devid_from_ivhd(struct ivhd_header *h)

{

	u8 *p = (void *)h, *end = (void *)h;

	struct ivhd_entry *dev;



	p += sizeof(*h);

	end += h->length;



	find_last_devid_on_pci(PCI_BUS(h->devid),

			PCI_SLOT(h->devid),

			PCI_FUNC(h->devid),

			h->cap_ptr);



	while (p < end) {

		dev = (struct ivhd_entry *)p;

		switch (dev->type) {

		case IVHD_DEV_SELECT:

		case IVHD_DEV_RANGE_END:

		case IVHD_DEV_ALIAS:

		case IVHD_DEV_EXT_SELECT:

			UPDATE_LAST_BDF(dev->devid);

			break;

		default:

			break;

		}

		p += 0x04 << (*p >> 6);

	}



	WARN_ON(p != end);



	return 0;

}



static int __init find_last_devid_acpi(struct acpi_table_header *table)

{

	int i;

	u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table;

	struct ivhd_header *h;



	/*

	 * Validate checksum here so we don't need to do it when

	 * we actually parse the table

	 */

	for (i = 0; i < table->length; ++i)

		checksum += p[i];

	if (checksum != 0)

		/* ACPI table corrupt */

		return -ENODEV;



	p += IVRS_HEADER_LENGTH;



	end += table->length;

	while (p < end) {

		h = (struct ivhd_header *)p;

		switch (h->type) {

		case ACPI_IVHD_TYPE:

			find_last_devid_from_ivhd(h);

			break;

		default:

			break;

		}

		p += h->length;

	}

	WARN_ON(p != end);



	return 0;

}