[PATCH v3 08/12] gunyah: sysfs: Add node to describe supported features
From: Elliot Berman <hidden>
Date: 2022-08-11 21:47:14
Also in:
linux-arm-msm, linux-devicetree, linux-doc
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add a sysfs node to list the features that the Gunyah hypervisor and Linux supports. For now, Linux support cspace (capability IDs) and message queues, so only report those.. Signed-off-by: Elliot Berman <redacted> --- Documentation/ABI/testing/sysfs-hypervisor-gunyah | 15 +++++++++++++++ drivers/virt/gunyah/sysfs.c | 15 +++++++++++++++ 2 files changed, 30 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-hypervisor-gunyah b/Documentation/ABI/testing/sysfs-hypervisor-gunyah
index 219465783a9e..7c14027b3daa 100644
--- a/Documentation/ABI/testing/sysfs-hypervisor-gunyah
+++ b/Documentation/ABI/testing/sysfs-hypervisor-gunyah@@ -6,6 +6,21 @@ Description: If running under Gunyah: Type of hypervisor: "gunyah": Gunyah hypervisor +What: /sys/hypervisor/gunyah/features +Date: August 2022 +KernelVersion: 6.0 +Contact: linux-arm-msm@vger.kernel.org +Description: If running under Gunyah: + Space separated list of features supported by Linux and Gunyah: + "cspace": Gunyah devices + "doorbell": Sending/receiving virtual interrupts via Gunyah doorbells + "message-queue": Sending/receiving messages via Gunyah message queues + "vic": Interrupt lending + "vpm": Virtual platform management + "vcpu": Virtual CPU management + "memextent": Memory lending/management + "trace": Gunyah hypervisor tracing + What: /sys/hypervisor/gunyah/api Date: August 2022 KernelVersion: 6.0
diff --git a/drivers/virt/gunyah/sysfs.c b/drivers/virt/gunyah/sysfs.c
index 9de700fdbfcb..8c6ea141ec66 100644
--- a/drivers/virt/gunyah/sysfs.c
+++ b/drivers/virt/gunyah/sysfs.c@@ -31,9 +31,24 @@ static ssize_t variant_show(struct kobject *kobj, struct kobj_attribute *attr, c } static struct kobj_attribute variant_attr = __ATTR_RO(variant); +static ssize_t features_show(struct kobject *kobj, struct kobj_attribute *attr, char *buffer) +{ + int len = 0; + + if (GH_IDENTIFY_PARTITION_CSPACE(gunyah_api.flags)) + len += sysfs_emit_at(buffer, len, "cspace "); + if (GH_IDENTIFY_MSGQUEUE(gunyah_api.flags)) + len += sysfs_emit_at(buffer, len, "message-queue "); + + len += sysfs_emit_at(buffer, len, "\n"); + return len; +} +static struct kobj_attribute features_attr = __ATTR_RO(features); + static struct attribute *gunyah_attrs[] = { &api_attr.attr, &variant_attr.attr, + &features_attr.attr, NULL };
--
2.25.1
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