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Wed, 28 Sep 2022 19:57:30 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Wed, 28 Sep 2022 12:57:29 -0700 From: Elliot Berman To: Bjorn Andersson CC: Elliot Berman , Murali Nalajala , Trilok Soni , "Srivatsa Vaddagiri" , Carl van Schaik , Andy Gross , Dmitry Baryshkov , Jassi Brar , , Mark Rutland , Lorenzo Pieralisi , Sudeep Holla , Marc Zyngier , Rob Herring , Krzysztof Kozlowski , Jonathan Corbet , "Will Deacon" , Catalin Marinas , "Arnd Bergmann" , Greg Kroah-Hartman , , , , Subject: [PATCH v4 10/14] gunyah: sysfs: Add node to describe supported features Date: Wed, 28 Sep 2022 12:56:29 -0700 Message-ID: <20220928195633.2348848-11-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220928195633.2348848-1-quic_eberman@quicinc.com> References: <20220928195633.2348848-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: pUJGMMg_9P2Ys9jig0Tv6oGKrlLeQ9XR X-Proofpoint-ORIG-GUID: pUJGMMg_9P2Ys9jig0Tv6oGKrlLeQ9XR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-28_08,2022-09-28_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 clxscore=1015 mlxlogscore=892 malwarescore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 mlxscore=0 impostorscore=0 suspectscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2209280119 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220928_125742_910878_E2DF7BF7 X-CRM114-Status: GOOD ( 18.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- 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 7d74e74e9edd..6d0cde30355a 100644 --- a/Documentation/ABI/testing/sysfs-hypervisor-gunyah +++ b/Documentation/ABI/testing/sysfs-hypervisor-gunyah @@ -1,3 +1,18 @@ +What: /sys/hypervisor/gunyah/features +Date: October 2022 +KernelVersion: 6.1 +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: October 2022 KernelVersion: 6.1 diff --git a/drivers/virt/gunyah/sysfs.c b/drivers/virt/gunyah/sysfs.c index ec11510cbece..f8ec0553c197 100644 --- a/drivers/virt/gunyah/sysfs.c +++ b/drivers/virt/gunyah/sysfs.c @@ -25,9 +25,24 @@ 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 };