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Wed, 22 Oct 2025 23:02:32 +0000 Message-ID: <9d7ccca5-f6c8-4a6b-9319-e183fac9a5af@intel.com> Date: Thu, 23 Oct 2025 01:02:26 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 08/26] drm/xe/pf: Expose VF migration data size over debugfs To: =?UTF-8?Q?Micha=C5=82_Winiarski?= , "Alex Williamson" , Lucas De Marchi , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= , Rodrigo Vivi , Jason Gunthorpe , Yishai Hadas , Kevin Tian , , , , Matthew Brost CC: , Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , "Lukasz Laguna" References: <20251021224133.577765-1-michal.winiarski@intel.com> <20251021224133.577765-9-michal.winiarski@intel.com> Content-Language: en-US From: Michal Wajdeczko In-Reply-To: <20251021224133.577765-9-michal.winiarski@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: BE1P281CA0135.DEUP281.PROD.OUTLOOK.COM (2603:10a6:b10:7a::6) To MN0PR11MB6011.namprd11.prod.outlook.com (2603:10b6:208:372::6) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN0PR11MB6011:EE_|IA4PR11MB8913:EE_ X-MS-Office365-Filtering-Correlation-Id: a2670813-f825-4d1e-9c12-08de11bf1509 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|366016|1800799024|376014|921020; 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> + > + xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt))); > + > + /* Nothing to query yet - will be updated once per-GT migration data types are added */ > + return total; > +} > + > /** > * xe_gt_sriov_pf_migration_ring_empty() - Check if a migration ring is empty. > * @gt: the &xe_gt > diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h > index 1ed2248f0a17e..e2d41750f863c 100644 > --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h > +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h > @@ -15,6 +15,8 @@ int xe_gt_sriov_pf_migration_init(struct xe_gt *gt); > int xe_gt_sriov_pf_migration_save_guc_state(struct xe_gt *gt, unsigned int vfid); > int xe_gt_sriov_pf_migration_restore_guc_state(struct xe_gt *gt, unsigned int vfid); > > +ssize_t xe_gt_sriov_pf_migration_size(struct xe_gt *gt, unsigned int vfid); > + > bool xe_gt_sriov_pf_migration_ring_empty(struct xe_gt *gt, unsigned int vfid); > bool xe_gt_sriov_pf_migration_ring_full(struct xe_gt *gt, unsigned int vfid); > void xe_gt_sriov_pf_migration_ring_free(struct xe_gt *gt, unsigned int vfid); > diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c > index a9a28aec22421..bc2d0b0342f22 100644 > --- a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c > +++ b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c > @@ -14,6 +14,7 @@ > #include "xe_sriov_pf_control.h" > #include "xe_sriov_pf_debugfs.h" > #include "xe_sriov_pf_helpers.h" > +#include "xe_sriov_pf_migration.h" > #include "xe_sriov_pf_provision.h" > #include "xe_sriov_pf_service.h" > #include "xe_sriov_printk.h" > @@ -254,6 +255,33 @@ static const struct file_operations data_vf_fops = { > .llseek = default_llseek, > }; > > +static ssize_t size_read(struct file *file, char __user *ubuf, size_t count, loff_t *ppos) > +{ > + struct dentry *dent = file_dentry(file)->d_parent; > + struct xe_device *xe = extract_xe(dent); > + unsigned int vfid = extract_vfid(dent); > + char buf[21]; > + ssize_t ret; > + int len; > + > + xe_pm_runtime_get(xe); > + ret = xe_sriov_pf_migration_size(xe, vfid); > + xe_pm_runtime_put(xe); IIRC during simple "cat migration_size" we might be called twice to avoid that we can calc size in .open instead, see config_blob but not a blocker, so Reviewed-by: Michal Wajdeczko > + if (ret < 0) > + return ret; > + > + len = scnprintf(buf, sizeof(buf), "%zd\n", ret); > + > + return simple_read_from_buffer(ubuf, count, ppos, buf, len); > +} > + > +static const struct file_operations size_vf_fops = { > + .owner = THIS_MODULE, > + .open = simple_open, > + .read = size_read, > + .llseek = default_llseek, > +}; > + > static void pf_populate_vf(struct xe_device *xe, struct dentry *vfdent) > { > debugfs_create_file("pause", 0200, vfdent, xe, &pause_vf_fops); > @@ -263,6 +291,7 @@ static void pf_populate_vf(struct xe_device *xe, struct dentry *vfdent) > debugfs_create_file("save", 0600, vfdent, xe, &save_vf_fops); > debugfs_create_file("restore", 0600, vfdent, xe, &restore_vf_fops); > debugfs_create_file("migration_data", 0600, vfdent, xe, &data_vf_fops); > + debugfs_create_file("migration_size", 0400, vfdent, xe, &size_vf_fops); > } > > static void pf_populate_with_tiles(struct xe_device *xe, struct dentry *dent, unsigned int vfid) > diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_migration.c b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c > index 0b4b237780102..88babec9c893e 100644 > --- a/drivers/gpu/drm/xe/xe_sriov_pf_migration.c > +++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c > @@ -242,3 +242,33 @@ int xe_sriov_pf_migration_restore_produce(struct xe_device *xe, unsigned int vfi > > return xe_gt_sriov_pf_migration_restore_produce(gt, vfid, data); > } > + > +/** > + * xe_sriov_pf_migration_size() - Total size of migration data from all components within a device > + * @xe: the &xe_device > + * @vfid: the VF identifier (can't be 0) > + * > + * This function is for PF only. > + * > + * Return: total migration data size in bytes or a negative error code on failure. > + */ > +ssize_t xe_sriov_pf_migration_size(struct xe_device *xe, unsigned int vfid) > +{ > + size_t size = 0; > + struct xe_gt *gt; > + ssize_t ret; > + u8 gt_id; > + > + xe_assert(xe, IS_SRIOV_PF(xe)); > + xe_assert(xe, vfid); > + > + for_each_gt(gt, xe, gt_id) { > + ret = xe_gt_sriov_pf_migration_size(gt, vfid); > + if (ret < 0) > + return ret; > + > + size += ret; > + } > + > + return size; > +} > diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_migration.h b/drivers/gpu/drm/xe/xe_sriov_pf_migration.h > index df81a540c246a..16cb444c36aa6 100644 > --- a/drivers/gpu/drm/xe/xe_sriov_pf_migration.h > +++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.h > @@ -18,6 +18,7 @@ int xe_sriov_pf_migration_restore_produce(struct xe_device *xe, unsigned int vfi > struct xe_sriov_migration_data *data); > struct xe_sriov_migration_data * > xe_sriov_pf_migration_save_consume(struct xe_device *xe, unsigned int vfid); > +ssize_t xe_sriov_pf_migration_size(struct xe_device *xe, unsigned int vfid); > wait_queue_head_t *xe_sriov_pf_migration_waitqueue(struct xe_device *xe, unsigned int vfid); > > #endif