From mboxrd@z Thu Jan 1 00:00:00 1970 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 63A6B1A0BD6 for ; Wed, 15 Oct 2025 00:10:46 +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=1760487048; cv=pass; b=QyZFnv3RJNf76HqhXboEeX0Mp8qXdQFEbgDtaA++bbEKIijtDrQNFopjmy9gToFzjFBu/L5dEQ2ApEbqf2DfQJ2SkfP+Y56o2pzwcvbFQ5SchPiDmMPh5Gpz8bCdMGUanNpNRQC5UqfjuyH4ZhS9b1EDdXdHl6kBGrt10dJImk4= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760487048; c=relaxed/simple; bh=5IOB5JiNTlszlwy8/yDSir1ADlcvRJPeYJCvj3iHGSs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=tAq9xZM0nZ62KR6Ts4W5wxmSb3UZ/sy3b3mPfRACtFS9fuE/3KxRdSBc71j9DJA4EldTQpuCPBsiT9qMxKodCcbH6Z3INLsgDuiuj/bIgNyByiYoYIEwhUqsBhQfyl30Ci4VsTBG2eqPPDUiZUM713SWgEgOXWgl0TZ5OvqYqME= 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=B+5vnFa3; 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="B+5vnFa3" ARC-Seal: i=1; a=rsa-sha256; t=1760487029; cv=none; d=zohomail.com; s=zohoarc; b=AbIMEgzChvM3oeaJI9Bd8EODazdIp8H7BBEVDAJoLkajUpuM/LB/owZ48LafIfIz9vrDaslhGdT78Si9r/0INA/JTnS/iwTVknaDLBO5LHMYKhQ4sU7vWaLAR2R0BbfvtxorNpZxa/1mEHfWV/J0Xn0zACfvFdj2+XZK80mhZ/A= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1760487029; 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=iYU8Y6fdfg6t9q0eb4oUSrrpbJyFoasUUDRYSuiHHv4=; b=j2JDCCxSifFpCxlDx/pL+xJRPRKzLLD67ZG94IC3hZX9yk9ZxYvctrg8fQiNXqRNgGp+BY0ZrEun0vqc5AF7KDylRR4dD+jUEQROS4Y5uNRB4IZMRcbWwxMtx2DKfVJKwHPTIfAOpA/XjQeOuEjm26C4zQUmx2KKEP462bpvd4o= 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=1760487029; 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=iYU8Y6fdfg6t9q0eb4oUSrrpbJyFoasUUDRYSuiHHv4=; b=B+5vnFa3GxYM7iSjilhT7iNfQVLahRNbZjswycHLTtgVd9HESnXzsVFzAne+PnQq d+Vt6uP7B5HurNQVLV+C0gzXCLIGECZBXcERyygl1MNLSMpmO1K4n2SCKjcQ2DNTkHm tljQFv0sy7nvWsF6b042g5nU3R0C91JvhF2E8FQQ= Received: by mx.zohomail.com with SMTPS id 1760487028919256.12883687539625; Tue, 14 Oct 2025 17:10:28 -0700 (PDT) From: =?UTF-8?q?Adri=C3=A1n=20Larumbe?= To: linux-kernel@vger.kernel.org Cc: dri-devel@lists.freedesktop.org, Steven Price , Boris Brezillon , kernel@collabora.com, =?UTF-8?q?Adri=C3=A1n=20Larumbe?= , Rob Herring , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Subject: [PATCH v6 05/12] drm/panfrost: Check sgt to know whether pages are already mapped Date: Wed, 15 Oct 2025 01:09:11 +0100 Message-ID: <20251015000930.356073-6-adrian.larumbe@collabora.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251015000930.356073-1-adrian.larumbe@collabora.com> References: <20251015000930.356073-1-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: 8bit In the MMU's page fault ISR for a heap object, determine whether the faulting address belongs to a 2MiB block that was already mapped by checking its corresponding sgt in the Panfrost BO. This is done in preparation for a future commit in which the MMU mapping helper might fail, but the page array is left populated, so this cannot be used as a check for an early bail-out. Signed-off-by: Adrián Larumbe --- drivers/gpu/drm/panfrost/panfrost_mmu.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c index cf272b167feb..ba32d99ed854 100644 --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -600,10 +600,12 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, refcount_set(&bo->base.pages_use_count, 1); } else { pages = bo->base.pages; - if (pages[page_offset]) { - /* Pages are already mapped, bail out. */ - goto out; - } + } + + sgt = &bo->sgts[page_offset / (SZ_2M / PAGE_SIZE)]; + if (sgt->sgl) { + /* Pages are already mapped, bail out. */ + goto out; } mapping = bo->base.base.filp->f_mapping; @@ -625,7 +627,6 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, } } - sgt = &bo->sgts[page_offset / (SZ_2M / PAGE_SIZE)]; ret = sg_alloc_table_from_pages(sgt, pages + page_offset, NUM_FAULT_PAGES, 0, SZ_2M, GFP_KERNEL); if (ret) -- 2.51.0