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irqchip/gicv3-its: platform-msi: Scan MADT to create platform msi domain 

With the introduction of its_pmsi_init_one(), support for ACPI
firmware interface can be plugged into the gicv3 ITS driver.

Add code to scan the MADT table to get the ITS entry(ies), then use
the information to create the platform msi domain for devices
connected to it, mirroring the ITS PCI MSI code path.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
[lorenzo.pieralisi@arm.com: rewrote commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Tested-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Wei Xu <xuwei5@hisilicon.com>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
Cc: Tomasz Nowicki <tn@semihalf.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Hanjun Guo 2017-03-07 20:40:02 +08:00 committed by Marc Zyngier
parent 42677db900
commit f785f7d2e3
1 changed files with 37 additions and 0 deletions
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37
drivers/irqchip/irq-gic-v3-its-platform-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/device.h>
#include <linux/msi.h>
#include <linux/of.h>
@ -103,6 +104,41 @@ static int __init its_pmsi_init_one(struct fwnode_handle *fwnode,
return 0;
}
#ifdef CONFIG_ACPI
static int __init
its_pmsi_parse_madt(struct acpi_subtable_header *header,
const unsigned long end)
{
struct acpi_madt_generic_translator *its_entry;
struct fwnode_handle *domain_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);
domain_handle = iort_find_domain_token(its_entry->translation_id);
if (!domain_handle) {
pr_err("%s: Unable to locate ITS domain handle\n", node_name);
goto out;
}
err = its_pmsi_init_one(domain_handle, node_name);
out:
kfree(node_name);
return err;
}
static void __init its_pmsi_acpi_init(void)
{
acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
its_pmsi_parse_madt, 0);
}
#else
static inline void its_pmsi_acpi_init(void) { }
#endif
static void __init its_pmsi_of_init(void)
{
struct device_node *np;
@ -119,6 +155,7 @@ static void __init its_pmsi_of_init(void)
static int __init its_pmsi_init(void)
{
its_pmsi_of_init();
its_pmsi_acpi_init();
return 0;
}
early_initcall(its_pmsi_init);