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Commit 723344dd authored by Tomasz Nowicki's avatar Tomasz Nowicki Committed by Marc Zyngier
Browse files

irqchip/gicv3-its: Use MADT ITS subtable to do PCI/MSI domain initialization 



Let ACPI build ITS PCI MSI domain. ACPI code is responsible for retrieving
inner domain token and passing it on to its_pci_msi_init_one generic
init call.

IORT maintains list of registered domain tokens and allows to find
corresponding domain based on MADT ITS subtable ID info.

Signed-off-by: default avatarTomasz Nowicki <tn@semihalf.com>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Reviewed-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent db744aaa

drivers/irqchip/irq-gic-v3-its-pci-msi.c

+44 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/acpi_iort.h>

#include <linux/msi.h>

#include <linux/of.h>

#include <linux/of_irq.h>
@@ -144,9 +145,52 @@ static int __init its_pci_of_msi_init(void) 
	return 0;

}



#ifdef CONFIG_ACPI



static int __init

its_pci_msi_parse_madt(struct acpi_subtable_header *header,

		       const unsigned long end)

{

	struct acpi_madt_generic_translator *its_entry;

	struct fwnode_handle *dom_handle;

	const char *node_name;

	int err = -ENXIO;



	its_entry = (struct acpi_madt_generic_translator *)header;

	node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",

			      (long)its_entry->base_address);

	dom_handle = iort_find_domain_token(its_entry->translation_id);

	if (!dom_handle) {

		pr_err("%s: Unable to locate ITS domain handle\n", node_name);

		goto out;

	}



	err = its_pci_msi_init_one(dom_handle, node_name);

	if (!err)

		pr_info("PCI/MSI: %s domain created\n", node_name);



out:

	kfree(node_name);

	return err;

}



static int __init its_pci_acpi_msi_init(void)

{

	acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,

			      its_pci_msi_parse_madt, 0);

	return 0;

}

#else

static int __init its_pci_acpi_msi_init(void)

{

	return 0;

}

#endif



static int __init its_pci_msi_init(void)

{

	its_pci_of_msi_init();

	its_pci_acpi_msi_init();



	return 0;

}