From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:60102 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754948AbdC1Mkk (ORCPT ); Tue, 28 Mar 2017 08:40:40 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marek Szyprowski , Andrzej Hajda , Joerg Roedel Subject: [PATCH 4.10 087/111] iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5 Date: Tue, 28 Mar 2017 14:31:13 +0200 Message-Id: <20170328122919.284194470@linuxfoundation.org> In-Reply-To: <20170328122915.640228468@linuxfoundation.org> References: <20170328122915.640228468@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marek Szyprowski commit cd37a296a9f890586665bb8974a8b17ee2f17d6d upstream. For some unknown reasons, in some cases, FLPD cache invalidation doesn't work properly with SYSMMU v5 controllers found in Exynos5433 SoCs. This can be observed by a firmware crash during initialization phase of MFC video decoder available in the mentioned SoCs when IOMMU support is enabled. To workaround this issue perform a full TLB/FLPD invalidation in case of replacing any first level page descriptors in case of SYSMMU v5. Fixes: 740a01eee9ada ("iommu/exynos: Add support for v5 SYSMMU") Signed-off-by: Marek Szyprowski Tested-by: Andrzej Hajda Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/exynos-iommu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -510,7 +510,10 @@ static void sysmmu_tlb_invalidate_flpdca if (data->active && data->version >= MAKE_MMU_VER(3, 3)) { clk_enable(data->clk_master); if (sysmmu_block(data)) { - __sysmmu_tlb_invalidate_entry(data, iova, 1); + if (data->version >= MAKE_MMU_VER(5, 0)) + __sysmmu_tlb_invalidate(data); + else + __sysmmu_tlb_invalidate_entry(data, iova, 1); sysmmu_unblock(data); } clk_disable(data->clk_master);