From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 5269B388E7C; Tue, 3 Mar 2026 09:23:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772529806; cv=none; b=Sr9g2CyMg+TlgIC8Et6VrIYQ+VKyJ6F+pfkxv0m/sQUgREDyhBJ1goyCEvxdkHgkrqDykSlpfirsOjK3ZlSMLCYDTEz2mmd6ptDt7ZUjjgHZFHBIVTL4NLZ9dUu+RqRH+U0trlzQI9eqIV+4s5gbNCJyeXv2jht4ra+vMuY+Tfo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772529806; c=relaxed/simple; bh=0zBTWC8IwXB4RbkGQknMHNdoMBuCWfVfKI+jsFXJbgk=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=UimCrqU1AbtbEK57z59pEo1nggr7nrUsjybQ8OTkjJoqcYirBAi0TDdTLkl+kr6cr0VZbgQ6vHctlnyJ8gTbcfaTItfRsrCK1am3H0haQ81eW9ynJJUH+oTZhEMGC2tO1UDL2Sai35OpJrXsUoyzw7FRs1fUJCWVQ6crtKDoBGw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PDd2VGpa; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PDd2VGpa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5E32C116C6; Tue, 3 Mar 2026 09:23:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772529805; bh=0zBTWC8IwXB4RbkGQknMHNdoMBuCWfVfKI+jsFXJbgk=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=PDd2VGpaDMViiHlpKUnz+h8PJT/E62xykUlrFdRUg+ue4P+x5Br1EwoEttR7FdvLG MSq+wH8W35DjnCF6pPrj1ImTu36faqGr5WmkvGXDfnvtObfwEhWiv74qzqxk/I19ae z2I6ss5Azih9POk9msxLy+1d7n82zNQxc8jPJNuLHgEw9/8gkx5pd+NPEACMbby9Qi 7d5yUH6xzcHyeXzhaWIiNlojw0KFdKIRsSoDK1PwIoU50UlBYWqj3vSmzDFs4iYYLB nccNFudjcJA8rCtEzYAxfDK6bRJCpylcfv/dDnz1UBcHPYbKIMomDlp1hZfRqz1W1u 72UjOAmLaZ7Zw== X-Mailer: emacs 30.2 (via feedmail 11-beta-1 I) From: Aneesh Kumar K.V To: Dan Williams , linux-coco@lists.linux.dev, linux-pci@vger.kernel.org Cc: gregkh@linuxfoundation.org, aik@amd.com, yilun.xu@linux.intel.com, bhelgaas@google.com, alistair23@gmail.com, lukas@wunner.de, jgg@nvidia.com, Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Christoph Hellwig , Danilo Krummrich , Dave Hansen , Donald Hunter , "H. Peter Anvin" , Ingo Molnar , Jakub Kicinski , Jason Gunthorpe , Luis Chamberlain , Marek Szyprowski , Peter Zijlstra , "Rafael J. Wysocki" , Robin Murphy , Roman Kisel , Samuel Ortiz , Saravana Kannan , Suzuki K Poulose , Thomas Gleixner , Thomas Gleixner Subject: Re: [PATCH v2 00/19] PCI/TSM: TEE I/O infrastructure In-Reply-To: <20260303000207.1836586-1-dan.j.williams@intel.com> References: <20260303000207.1836586-1-dan.j.williams@intel.com> Date: Tue, 03 Mar 2026 14:53:12 +0530 Message-ID: Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Dan Williams writes: .... To support devices without IDE/DOE support we need something similar. modified drivers/pci/tsm/core.c @@ -1236,12 +1236,14 @@ int pci_tsm_pf0_constructor(struct pci_dev *pdev, struct pci_tsm_pf0 *tsm, struct tsm_dev *tsm_dev) { mutex_init(&tsm->lock); - tsm->doe_mb = pci_find_doe_mailbox(pdev, PCI_VENDOR_ID_PCI_SIG, - PCI_DOE_FEATURE_CMA); - if (!tsm->doe_mb) { - pci_warn(pdev, "TSM init failure, no CMA mailbox\n"); - return -ENODEV; - } + + /* + * Note, low-level TSM driver responsible for determining if it wants to + * proceed with a device that has no DOE mailbox. TSM may have an + * alternate method for coordinating TDISP. + */ + if (!tsm->doe_mb) + pci_dbg(pdev, "no CMA mailbox\n"); return pci_tsm_link_constructor(pdev, &tsm->base_tsm, tsm_dev); }