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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: Tomasz Nowicki <tn@semihalf.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Tomasz Nowicki 2016-09-12 20:32:27 +02:00 committed by Marc Zyngier
parent db744aaa27
commit 723344dd0b
1 changed files with 44 additions and 0 deletions
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44
drivers/irqchip/irq-gic-v3-its-pci-msi.c
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@ -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;
}