From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AC0B7CAC5B5 for ; Mon, 29 Sep 2025 05:48:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5EB4410E152; Mon, 29 Sep 2025 05:48:23 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="FFskXoou"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4941010E152 for ; Mon, 29 Sep 2025 05:48:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1759124902; x=1790660902; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=2RAeBETVs1/KXrxnfI8JSHgmNa2bHGeDNeMm+sV4NRk=; b=FFskXoouzehpA1LohtN4puJ3P4bbhiCG79DDvHIWnOY5OL1xB3MBs04j ljAFW0u8AdxzfuFRE7sv2YWvqdgkOdNCjcdi+GowxC434eakhVTdVFY2n 1af2U4ybJyVGQGoPye+8NcUW5Dkyygtd29l0qK5yQ+KSmjrZf7JhSUkC+ hYMq609yYgCgwxMQXr6e5wZkMJ669TqvYZf3UfJR0LXpukbr6jAkFNC0Q c0K/lK4FbXdlih/okNHqFBwWAgUdDbTAIjYj7jJAk00BAeKwVoAy3TqMM GMpJsyP4WXrDf6J0nJeYn3vfxTRnzzRKFAHNf/FmQgpRhrHx3Lsb93R8Z Q==; X-CSE-ConnectionGUID: G8N3LDF6TQKTEOFSGhOG2Q== X-CSE-MsgGUID: lxycKrhXSsetnHuo80Tqlg== X-IronPort-AV: E=McAfee;i="6800,10657,11567"; a="72459180" X-IronPort-AV: E=Sophos;i="6.18,301,1751266800"; d="scan'208";a="72459180" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2025 22:48:22 -0700 X-CSE-ConnectionGUID: zAzKvycDTcy5TchmWn9jnw== X-CSE-MsgGUID: 4NvnMrF3Q9mWisWZq/26UA== X-ExtLoop1: 1 Received: from naresh-nuc8i7beh.iind.intel.com (HELO nkumarg-desk.iind.intel.com) ([10.190.216.171]) by fmviesa003.fm.intel.com with ESMTP; 28 Sep 2025 22:48:20 -0700 From: Nareshkumar Gollakoti To: intel-xe@lists.freedesktop.org Cc: naresh.kumar.g@intel.com, Michal.Wajdeczko@intel.com, varun.gupta@intel.com Subject: [PATCH] drm/xe/: Mutual Exclusivity b/w Multi CCS Mode & SRIOV VF Provisioning Date: Mon, 29 Sep 2025 11:13:33 +0530 Message-ID: <20250929054332.599463-2-naresh.kumar.g@intel.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" Due to SLA agreement between PF and VFs, multi CCS mode can't be enabled when VFs are already enabled. Similarly, enabling VFs is disabled when multi ccs mode enabled. v2:function xe_device_is_vf_enabled has been refactored to xe_sriov_pf_has_vfs_enabled and moved to xe_sriov_pf_helper.h. The code now distinctly checks for SR-IOV VF mode and SR-IOV PF with VFs enabled. Log messages have been updated to explicitly state the current mode. The function xe_multi_ccs_mode_enabled is moved to xe_device.h Signed-off-by: Nareshkumar Gollakoti --- drivers/gpu/drm/xe/xe_device.h | 8 ++++++++ drivers/gpu/drm/xe/xe_gt_ccs_mode.c | 14 +++++++++++--- drivers/gpu/drm/xe/xe_pci_sriov.c | 6 ++++++ drivers/gpu/drm/xe/xe_sriov_pf_helpers.h | 12 ++++++++++++ 4 files changed, 37 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/xe/xe_device.h b/drivers/gpu/drm/xe/xe_device.h index 32cc6323b7f6..986f9cabb897 100644 --- a/drivers/gpu/drm/xe/xe_device.h +++ b/drivers/gpu/drm/xe/xe_device.h @@ -172,6 +172,14 @@ static inline bool xe_device_has_lmtt(struct xe_device *xe) return IS_DGFX(xe); } +static inline bool xe_multi_ccs_mode_enabled(struct xe_device *xe) +{ + /* Multi CCS mode supported exclusively on GT0 */ + struct xe_gt *gt = xe_device_get_gt(xe, 0); + + return gt->ccs_mode > 1; +} + u32 xe_device_ccs_bytes(struct xe_device *xe, u64 size); void xe_device_snapshot_print(struct xe_device *xe, struct drm_printer *p); diff --git a/drivers/gpu/drm/xe/xe_gt_ccs_mode.c b/drivers/gpu/drm/xe/xe_gt_ccs_mode.c index 50fffc9ebf62..584f3245fc7d 100644 --- a/drivers/gpu/drm/xe/xe_gt_ccs_mode.c +++ b/drivers/gpu/drm/xe/xe_gt_ccs_mode.c @@ -13,6 +13,7 @@ #include "xe_gt_sysfs.h" #include "xe_mmio.h" #include "xe_sriov.h" +#include "xe_sriov_pf_helpers.h" static void __xe_gt_apply_ccs_mode(struct xe_gt *gt, u32 num_engines) { @@ -117,9 +118,16 @@ ccs_mode_store(struct device *kdev, struct device_attribute *attr, u32 num_engines, num_slices; int ret; - if (IS_SRIOV(xe)) { - xe_gt_dbg(gt, "Can't change compute mode when running as %s\n", - xe_sriov_mode_to_string(xe_device_sriov_mode(xe))); + /* + * Check if the device is: + * 1. Operating as an SR-IOV Virtual Function (VF), or + * 2. An SR-IOV Physical Function (PF) with one or more VFs enabled. + * Enabling multi CCS mode is not permitted in either scenario. + */ + if (IS_SRIOV_VF(xe) || xe_sriov_pf_has_vfs_enabled(xe)) { + const char *mode_str = !strcmp(xe_sriov_mode_to_string(xe_device_sriov_mode(xe)), + "SR-IOV VF") ? "SR-IOV VF" : "SR-IOV PF with VFs Enabled"; + xe_gt_dbg(gt, "Can't change compute mode when running as %s\n", mode_str); return -EOPNOTSUPP; } diff --git a/drivers/gpu/drm/xe/xe_pci_sriov.c b/drivers/gpu/drm/xe/xe_pci_sriov.c index af05db07162e..71c1d998ba82 100644 --- a/drivers/gpu/drm/xe/xe_pci_sriov.c +++ b/drivers/gpu/drm/xe/xe_pci_sriov.c @@ -155,6 +155,12 @@ static int pf_enable_vfs(struct xe_device *xe, int num_vfs) xe_assert(xe, num_vfs <= total_vfs); xe_sriov_dbg(xe, "enabling %u VF%s\n", num_vfs, str_plural(num_vfs)); + if (xe_multi_ccs_mode_enabled(xe)) { + xe_sriov_info(xe, "Disable multi-ccs mode before enabling VF's\n"); + + return -ECANCELED; + } + err = xe_sriov_pf_wait_ready(xe); if (err) goto out; diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h b/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h index dd1df950b021..35aff4fab56b 100644 --- a/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h +++ b/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h @@ -43,4 +43,16 @@ static inline struct mutex *xe_sriov_pf_master_mutex(struct xe_device *xe) return &xe->sriov.pf.master_lock; } +/** + * xe_sriov_pf_has_vfs_enabled() - Determines if the PF has any VFs enabled + * + * Return: true if one or more VFs are enabled on the PF, false otherwise. + */ +static inline bool xe_sriov_pf_has_vfs_enabled(const struct xe_device *xe) +{ + struct pci_dev *pdev = to_pci_dev(xe->drm.dev); + + return pci_num_vf(pdev) > 0; +} + #endif -- 2.43.0