From nobody Fri Dec 19 07:35:52 2025 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C11C14F9F4 for ; Wed, 26 Mar 2025 02:15:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742955346; cv=pass; b=rB7skAdaeNU5JMY2kyAP7fqI+i4R3yvHlUEg8H8wfIr3ys+sZ6+9051jeSzb20qUQUVcor80P9FW8ECPXCerhjFCir5amtS5YD74wrunPhGC62rJZ2LrLhDpdSiyfGI5qWQnRFXe9B4GteLKU/O56i/1tPY6FMGDZF5zMZW82AE= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742955346; c=relaxed/simple; bh=P5UJTQ3Gn8WB5lpexHITraKYUI9T9VYP8az19NgsZ1k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=PlMWy9VyTPcPBvNS1btICOElnTImDHD5Oh2nmOrCTWilg++hK7MX8BR2q3xZjcwPxk4fuKvrKgtMgYcwwX24RuLXNXU/967Jm4iDIzH/OA+QTwIlrGukVZ+kxRsodqQcqlejRz6rtM3lessv195xiDDyRqaBPAenVdxyG+LzqNI= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=adrian.larumbe@collabora.com header.b=Pz4wy852; arc=pass smtp.client-ip=136.143.188.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=adrian.larumbe@collabora.com header.b="Pz4wy852" ARC-Seal: i=1; a=rsa-sha256; t=1742955329; cv=none; d=zohomail.com; s=zohoarc; b=AVIT6ySTRQ1Imu+ucy2Dzhyb2FJkiCe7K5I0YwNBjY9UMzzBDykyCx6iBeYN7+MLUSWLbSzQqtdBG6i5dKKxMaziyiinQD6rD4Y248131FLNKSPIeHaIN1QgspIkBoMXE1hWw80vmVRf+wpk0VYs7TUsAolZboxx7Ru4VD8pKNE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1742955329; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=N6EeRE7HqfdBtYDSzkFIhVK4YQkzAdXLdg8zrxDgL4k=; b=i7CpF8tzro9wd8czMBVwYXeuIEk/xDMTSBOuxETs8FabCwQkTjLSyvBfJvEDlcFsOuJeqM1sRTNtUG2v6L+h7SmnmGqwHAnraNhBG0q07eri7LZCLPU3eXYpu5iLEbvTHv52QBp/houtDiGEiw8g2vgY6mGSn9sfGU1PKZs+31s= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=adrian.larumbe@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1742955329; s=zohomail; d=collabora.com; i=adrian.larumbe@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:In-Reply-To:References:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Reply-To; bh=N6EeRE7HqfdBtYDSzkFIhVK4YQkzAdXLdg8zrxDgL4k=; b=Pz4wy852f6C+t8RXrYy3l5Vn6wYcFD3Ph0iCOiBCmpooyplmEaumi7VpBPRyT53T DlhtZ0C59AHLM1QQz4PSLjvCM+5Gwnpk4OL0pq3UxUWGFYSRgvQGAtM+nklik+Nuz3K TT6Y5T58EQwh6CFAN+P4PbCWY/EUibBbgSVlftaY= Received: by mx.zohomail.com with SMTPS id 1742955327646847.7799386101219; Tue, 25 Mar 2025 19:15:27 -0700 (PDT) From: =?UTF-8?q?Adri=C3=A1n=20Larumbe?= To: Andrew Morton , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Boris Brezillon , Rob Herring , Steven Price , Liviu Dudau Cc: kernel@collabora.com, =?UTF-8?q?Adri=C3=A1n=20Larumbe?= , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC PATCH v2 5/6] drm/shmem: Add a helper to check object's page backing status Date: Wed, 26 Mar 2025 02:14:25 +0000 Message-ID: <20250326021433.772196-6-adrian.larumbe@collabora.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250326021433.772196-1-adrian.larumbe@collabora.com> References: <20250326021433.772196-1-adrian.larumbe@collabora.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Provide a helper function that lets shmem API users know whether a given object is backed by physical pages, or else in the case of a sparse shmem object, at least one of them is populated. The obvious user is fdinfo, which needs to know an object's resident status. Signed-off-by: Adri=C3=A1n Larumbe --- drivers/gpu/drm/drm_gem_shmem_helper.c | 18 ++++++++++++++++++ include/drm/drm_gem_shmem_helper.h | 2 ++ 2 files changed, 20 insertions(+) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_g= em_shmem_helper.c index 1bf33e5a1c4c..79ac7c7c953f 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -1033,6 +1033,24 @@ drm_gem_shmem_prime_import_sg_table(struct drm_devic= e *dev, } EXPORT_SYMBOL_GPL(drm_gem_shmem_prime_import_sg_table); =20 +/** + * drm_gem_shmem_is_populated - Tell whether the shem object is backed by + * at least one page of physical memory + * @shmem: shmem GEM object + * + * Returns: + * A boolean, where the 'true' value depends on at least one page being pr= eset + * in a sparse object's xarray, or all the shmem file pages for PRIME buff= ers + * and regular shmem objects. + */ +bool drm_gem_shmem_is_populated(struct drm_gem_shmem_object *shmem) +{ + return (shmem->base.import_attach || + (!shmem->sparse && shmem->pages) || + (shmem->sparse && !xa_empty(&shmem->xapages))); +} +EXPORT_SYMBOL_GPL(drm_gem_shmem_is_populated); + MODULE_DESCRIPTION("DRM SHMEM memory-management helpers"); MODULE_IMPORT_NS("DMA_BUF"); MODULE_LICENSE("GPL v2"); diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem= _helper.h index cbe4548e3ff6..60d2b8ef230b 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -302,6 +302,8 @@ drm_gem_shmem_prime_import_sg_table(struct drm_device *= dev, int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *de= v, struct drm_mode_create_dumb *args); =20 +bool drm_gem_shmem_is_populated(struct drm_gem_shmem_object *shmem); + /** * DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations * --=20 2.48.1