linux-kernel - [PATCH 3/3] ACPI: Let ACPI know we support Generic Initiator Affinity Structures

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Message-ID: <20190212164926.202-4-Jonathan.Cameron@huawei.com>
Date:   Tue, 12 Feb 2019 16:49:26 +0000
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     <jonathan.cameron@...wei.com>, <linux-mm@...ck.org>,
        <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <linuxarm@...wei.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Keith Busch <keith.busch@...el.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Michal Hocko <mhocko@...nel.org>, <jcm@...hat.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 3/3] ACPI: Let ACPI know we support Generic Initiator Affinity Structures

Until we tell ACPI that we support generic initiators, it will have
to operate in fall back domain mode and all _PXM entries should
be on existing non GI domains.

This patch sets the relevant OSC bit to make that happen.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---

Note that this will need platform guards unless we make generic initiators
work on all ACPI platforms from the start.

 drivers/acpi/bus.c   | 1 +
 include/linux/acpi.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 5c093ce01bcd..461fb393346a 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -315,6 +315,7 @@ static void acpi_bus_osc_support(void)
 
 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
+	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 
 #ifdef CONFIG_X86
 	if (boot_cpu_has(X86_FEATURE_HWP)) {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 87715f20b69a..760c6f3d57f0 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -498,6 +498,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
 #define OSC_SB_PCLPI_SUPPORT			0x00000080
 #define OSC_SB_OSLPI_SUPPORT			0x00000100
 #define OSC_SB_CPC_DIVERSE_HIGH_SUPPORT		0x00001000
+#define OSC_SB_GENERIC_INITIATOR_SUPPORT	0x00002000
 
 extern bool osc_sb_apei_support_acked;
 extern bool osc_pc_lpi_support_confirmed;
-- 
2.18.0