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Wed, 3 Sep 2025 21:08:34 -0700 From: To: , , , , , , , CC: , , , , , , , , , , , , , , Subject: [RFC 13/14] vfio/nvgrace-egm: expose the egm size through sysfs Date: Thu, 4 Sep 2025 04:08:27 +0000 Message-ID: <20250904040828.319452-14-ankita@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250904040828.319452-1-ankita@nvidia.com> References: <20250904040828.319452-1-ankita@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002529D:EE_|BL1PR12MB5993:EE_ X-MS-Office365-Filtering-Correlation-Id: 08f378de-9d51-4c51-7dcf-08ddeb68bd84 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|82310400026|1800799024|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?oQ80znGw+L7IqJyrzaW35bVFahTmCEt7MDQq6m/LxcFVUxKL5DMEpcsqubvv?= =?us-ascii?Q?edPKcZLv4LIr7/7uPA6jSLuiCw/KHv7QVAXAU4MhizxekaT9gTPysgqGY5R1?= =?us-ascii?Q?+sj//5ydIsoapUFg1Ev8Xoqi55lHPe3JQhUh4ICmPOBvdAWoBbw9BIp2lBJN?= =?us-ascii?Q?Cf/UguQlm/OaboWaoZ9h5nwmPhtQG9Lm2MmspHYfjAlBXAdJEezWWCOVfXC/?= =?us-ascii?Q?Wh4CEToB80Mo4uHE+rlsBsXFMRwlutVrBfM7BgI2IVVs9XTuCRoOMGZxRn15?= =?us-ascii?Q?YaITtIPocIviNM13qf9BKLi/Q6HguuHNEDrnv7qt1won4LNITdboiRme3JXw?= =?us-ascii?Q?URtusZ5l9/RL4IwWmmMbTI6mlCpqBhHEEaMwtBLVendzQ/IGwmCvS9KvwPaR?= =?us-ascii?Q?6BRrnVk0avoeEUoGIq/nEFx3/zYAdOOx1A2qY4FTqH7iP6tE+J1dug/2Pp8q?= =?us-ascii?Q?7yL0ftLG9x7lYrbwRy1MmMKFbjWTTrgrWiRb14WNKhwXlcozwLLyW0dC8Sog?= =?us-ascii?Q?DnR4tCj0bo5YEAme95uAyUtoKBHcpeX6+sh/R6VD7P7K4yGE+X8d1YHB35Kq?= =?us-ascii?Q?6xJ/Ox2Znlf/aVFuQmAwqVlrgEGhdmbAkzqtepczqWturw2aPCIgRHlMyB8d?= =?us-ascii?Q?0wT0CBka1UZbMBJol/wwfVBTTbO4lAshvlc23MPqiZnxngx3RIViWa2zXxO9?= =?us-ascii?Q?HdQWE1fUp5LbSDb/vo4fumxSo6iynVByAMNpueUaLCYHswLNaqtHD/KldLV3?= =?us-ascii?Q?JD819INL8ez9GFG1Ducj+lXM9rV1W8cvGW35LZy/ru98JddErcSLv0ls7VDo?= =?us-ascii?Q?y1Dng4F+8f6WkhT174lZIMf9vUkhToVAfxhtBzX095UB4uipQA6fvNUDIIOv?= =?us-ascii?Q?qTePFlyzOuAMwMM/v5QvXqqJXMOQSAVCHoi55lcdiohyfzJWLQnJ/AmI1XmE?= =?us-ascii?Q?GY0V2ear/kIu9kzuPV+hVFGdpntf4r2r9UQQ44dWvt07a78fsXHIPXtKG3C+?= =?us-ascii?Q?1cnRSAeTpCS5v/WpF9IRiXiiqE4bTX+XJhRhYBGh5rKsuc5kRmHCUnZRaai4?= =?us-ascii?Q?+WAKvzyk8v5sijphQq7OEtZwSvhAJQ8O+1p6T8OFf0avapeFnZLp0L2U8t0y?= =?us-ascii?Q?eNDxJ2o9V+6CWyFmMZZU8XmRhzmRDyF2KLZNxxn3fQc/66hKAWGzDQvO4LWQ?= =?us-ascii?Q?Bsw/QNOZRkG708VSGErviv2J56IJ1ChObFfPTWHRfXs3YsUxP6XP2G7E9zlp?= =?us-ascii?Q?4oMl4jPtaYqAtbF7oRsR6tF9ZdIhoMa87j/7BtVrTrcdqA26PfP8aR2rM+wf?= =?us-ascii?Q?qqRs6m3T1eHcuFRO/236KFDOJkMhC2Qxr3YulbFjDTOGXp9afLfEsktWXN9p?= =?us-ascii?Q?JaFjAmWaIQlTO8Y/G70OglERsQk5+zg4OtIoKWw1Pf7ha8hets9UUPxbrjfR?= =?us-ascii?Q?ICSAqoKh8XHbkIxNKnp1y6L9hjExRncJ63kWvQdmGYfvsi640X8ezaG38PiT?= =?us-ascii?Q?aF2RB+2C9A9U+FX/EIRGlukNa8/6EHnb89UC?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(82310400026)(1800799024)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Sep 2025 04:08:44.3780 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 08f378de-9d51-4c51-7dcf-08ddeb68bd84 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002529D.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5993 Content-Type: text/plain; charset="utf-8" From: Ankit Agrawal To allocate the EGM, the userspace need to know its size. Currently, there is no easy way for the userspace to determine that. Make nvgrace-egm expose the size through sysfs that can be queried by the userspace from /egm_size. On a 2-socket, 4 GPU Grace Blackwell setup, it shows up as: Socket0: /sys/devices/pci0008:00/0008:00:00.0/0008:01:00.0/nvgrace_gpu_vfio_pci.egm.= 4/egm/egm4/egm_size /sys/devices/pci0009:00/0009:00:00.0/0009:01:00.0/nvgrace_gpu_vfio_pci.egm.= 4/egm/egm4/egm_size Socket1: /sys/devices/pci0018:00/0018:00:00.0/0018:01:00.0/nvgrace_gpu_vfio_pci.egm.= 5/egm/egm5/egm_size /sys/devices/pci0019:00/0019:00:00.0/0019:01:00.0/nvgrace_gpu_vfio_pci.egm.= 5/egm/egm5/egm_size Signed-off-by: Ankit Agrawal --- drivers/vfio/pci/nvgrace-gpu/egm.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/vfio/pci/nvgrace-gpu/egm.c b/drivers/vfio/pci/nvgrace-= gpu/egm.c index 2cb100e39c4b..346607eeb0f9 100644 --- a/drivers/vfio/pci/nvgrace-gpu/egm.c +++ b/drivers/vfio/pci/nvgrace-gpu/egm.c @@ -343,6 +343,32 @@ static char *egm_devnode(const struct device *device, = umode_t *mode) return NULL; } =20 +static ssize_t egm_size_show(struct device *dev, struct device_attribute *= attr, + char *buf) +{ + struct chardev *egm_chardev =3D container_of(dev, struct chardev, device); + struct nvgrace_egm_dev *egm_dev =3D + egm_chardev_to_nvgrace_egm_dev(egm_chardev); + + return sysfs_emit(buf, "0x%lx\n", egm_dev->egmlength); +} + +static DEVICE_ATTR_RO(egm_size); + +static struct attribute *attrs[] =3D { + &dev_attr_egm_size.attr, + NULL, +}; + +static struct attribute_group attr_group =3D { + .attrs =3D attrs, +}; + +static const struct attribute_group *attr_groups[2] =3D { + &attr_group, + NULL +}; + static int __init nvgrace_egm_init(void) { int ret; @@ -364,6 +390,7 @@ static int __init nvgrace_egm_init(void) } =20 class->devnode =3D egm_devnode; + class->dev_groups =3D attr_groups; =20 ret =3D auxiliary_driver_register(&egm_driver); if (!ret) --=20 2.34.1