From patchwork Thu Feb 8 18:49:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Desnoyers X-Patchwork-Id: 13550358 Received: from smtpout.efficios.com (smtpout.efficios.com [167.114.26.122]) (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 B9DAF28DA6; Thu, 8 Feb 2024 18:49:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=167.114.26.122 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707418171; cv=none; b=mCH0TpSlR2b/YxkzZm8gDqfgYGhpMSLqVn5WQB945hgzj1x//GatZ7RlS8lFLrbTq0Qt9PQwoy/ECTTpc+vDc6Ay40KKWwPc6m0vYWSAfkmX93CTJJ2B3Is/r+831aptMmmdrHfWjoSjMOM9KJDBAnWYL+YhuXWkd78QrfQFKQk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707418171; c=relaxed/simple; bh=NdQ4OmFkV2+G2H8B4VkXTCxDeM+TIHeVIiPEQVlM7R8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=dZmE4m25CT0W9UMGSw64YHJX/3T2qVIcCBlNeuWjiGhPGms3traG20FFh+PL0LQ+NxApw6iU2rpKyf2AGf9d5vL4CokvlXkhI7FUSMzjRUNZipf2LaWHf7Qm/bE2A5KeC2ZplE7ya/1HFHWJYP3I6PtjHRCAq/6l0qZKbxM8VJM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com; spf=pass smtp.mailfrom=efficios.com; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b=BHv82fq4; arc=none smtp.client-ip=167.114.26.122 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=efficios.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b="BHv82fq4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1707418163; bh=NdQ4OmFkV2+G2H8B4VkXTCxDeM+TIHeVIiPEQVlM7R8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BHv82fq4hO859vusQup+/Ew3E/xkDIrfZ5htPvlriwUnHkvNeARgnnZMiSWHzApqW mBUnp7NhYcFC4sHncmcbqwbZiLufbXuPZ1mmrcc2XRx2OacMg8w1iMcNtrBwOoQ7t8 tlegoMFq/Kcq54d6KDuhbA+a5CHjBM14TYr6oFPdFcRGkfXiGVluKpmPuYTt++FmPu urOv+1cJgX+X7s/GbAlJpQacEjTwJqNEmsDVAUYaXnkKjRNrV7bXs2jN1Ij2VQhEwb /6iWsYm8EPA5tPa8SlmPXLVR3oPElZBuasrhf6GDfTwyLf9CcfdtgsPjHjkxUKokLX dtG+zbC42rI5A== Received: from thinkos.internal.efficios.com (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4TW5cg1khXzY5L; Thu, 8 Feb 2024 13:49:23 -0500 (EST) From: Mathieu Desnoyers To: Dan Williams , Arnd Bergmann , Dave Chinner Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , Andrew Morton , Linus Torvalds , Vishal Verma , Dave Jiang , Matthew Wilcox , Russell King , linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, dm-devel@lists.linux.dev, nvdimm@lists.linux.dev, linux-s390@vger.kernel.org, Alasdair Kergon , Mike Snitzer , Mikulas Patocka Subject: [PATCH v4 02/12] nvdimm/pmem: Treat alloc_dax() -EOPNOTSUPP failure as non-fatal Date: Thu, 8 Feb 2024 13:49:03 -0500 Message-Id: <20240208184913.484340-3-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240208184913.484340-1-mathieu.desnoyers@efficios.com> References: <20240208184913.484340-1-mathieu.desnoyers@efficios.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In preparation for checking whether the architecture has data cache aliasing within alloc_dax(), modify the error handling of nvdimm/pmem pmem_attach_disk() to treat alloc_dax() -EOPNOTSUPP failure as non-fatal. For the transition, consider that alloc_dax() returning NULL is the same as returning -EOPNOTSUPP. Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches") Signed-off-by: Mathieu Desnoyers Cc: Alasdair Kergon Cc: Mike Snitzer Cc: Mikulas Patocka Cc: Andrew Morton Cc: Linus Torvalds Cc: Dan Williams Cc: Vishal Verma Cc: Dave Jiang Cc: Matthew Wilcox Cc: Arnd Bergmann Cc: Russell King Cc: linux-arch@vger.kernel.org Cc: linux-cxl@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-xfs@vger.kernel.org Cc: dm-devel@lists.linux.dev Cc: nvdimm@lists.linux.dev --- drivers/nvdimm/pmem.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 9fe358090720..f1d9f5c6dbac 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -558,19 +558,21 @@ static int pmem_attach_disk(struct device *dev, disk->bb = &pmem->bb; dax_dev = alloc_dax(pmem, &pmem_dax_ops); - if (IS_ERR(dax_dev)) { - rc = PTR_ERR(dax_dev); - goto out; + if (IS_ERR_OR_NULL(dax_dev)) { + rc = IS_ERR(dax_dev) ? PTR_ERR(dax_dev) : -EOPNOTSUPP; + if (rc != -EOPNOTSUPP) + goto out; + } else { + set_dax_nocache(dax_dev); + set_dax_nomc(dax_dev); + if (is_nvdimm_sync(nd_region)) + set_dax_synchronous(dax_dev); + pmem->dax_dev = dax_dev; + rc = dax_add_host(dax_dev, disk); + if (rc) + goto out_cleanup_dax; + dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); } - set_dax_nocache(dax_dev); - set_dax_nomc(dax_dev); - if (is_nvdimm_sync(nd_region)) - set_dax_synchronous(dax_dev); - pmem->dax_dev = dax_dev; - rc = dax_add_host(dax_dev, disk); - if (rc) - goto out_cleanup_dax; - dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); rc = device_add_disk(dev, disk, pmem_attribute_groups); if (rc) goto out_remove_host;