Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753345AbbEKPqq (ORCPT ); Mon, 11 May 2015 11:46:46 -0400 Received: from e23smtp02.au.ibm.com ([202.81.31.144]:47350 "EHLO e23smtp02.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754597AbbEKPkx (ORCPT ); Mon, 11 May 2015 11:40:53 -0400 From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Cc: Alexey Kardashevskiy , David Gibson , Benjamin Herrenschmidt , Paul Mackerras , Alex Williamson , Gavin Shan , Wei Yang , linux-kernel@vger.kernel.org Subject: [PATCH kernel v10 22/34] powerpc/powernv: Implement accessor to TCE entry Date: Tue, 12 May 2015 01:39:11 +1000 Message-Id: <1431358763-24371-23-git-send-email-aik@ozlabs.ru> X-Mailer: git-send-email 2.4.0.rc3.8.gfb3e7d5 In-Reply-To: <1431358763-24371-1-git-send-email-aik@ozlabs.ru> References: <1431358763-24371-1-git-send-email-aik@ozlabs.ru> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15051115-0005-0000-0000-000001C45C46 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2791 Lines: 92 This replaces direct accesses to TCE table with a helper which returns an TCE entry address. This does not make difference now but will when multi-level TCE tables get introduces. No change in behavior is expected. Signed-off-by: Alexey Kardashevskiy Reviewed-by: David Gibson --- Changes: v9: * new patch in the series to separate this mechanical change from functional changes; this is not right before "powerpc/powernv: Implement multilevel TCE tables" but here in order to let the next patch - "powerpc/iommu/powernv: Release replaced TCE" - use pnv_tce() and avoid changing the same code twice --- arch/powerpc/platforms/powernv/pci.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-) diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c index ed7de7b..cc82f05 100644 --- a/arch/powerpc/platforms/powernv/pci.c +++ b/arch/powerpc/platforms/powernv/pci.c @@ -572,38 +572,46 @@ struct pci_ops pnv_pci_ops = { .write = pnv_pci_write_config, }; +static __be64 *pnv_tce(struct iommu_table *tbl, long idx) +{ + __be64 *tmp = ((__be64 *)tbl->it_base); + + return tmp + idx; +} + int pnv_tce_build(struct iommu_table *tbl, long index, long npages, unsigned long uaddr, enum dma_data_direction direction, struct dma_attrs *attrs) { u64 proto_tce = iommu_direction_to_tce_perm(direction); - __be64 *tcep; - u64 rpn; + u64 rpn = __pa(uaddr) >> tbl->it_page_shift; + long i; - tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset; - rpn = __pa(uaddr) >> tbl->it_page_shift; - - while (npages--) - *(tcep++) = cpu_to_be64(proto_tce | - (rpn++ << tbl->it_page_shift)); + for (i = 0; i < npages; i++) { + unsigned long newtce = proto_tce | + ((rpn + i) << tbl->it_page_shift); + unsigned long idx = index - tbl->it_offset + i; + *(pnv_tce(tbl, idx)) = cpu_to_be64(newtce); + } return 0; } void pnv_tce_free(struct iommu_table *tbl, long index, long npages) { - __be64 *tcep; + long i; - tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset; + for (i = 0; i < npages; i++) { + unsigned long idx = index - tbl->it_offset + i; - while (npages--) - *(tcep++) = cpu_to_be64(0); + *(pnv_tce(tbl, idx)) = cpu_to_be64(0); + } } unsigned long pnv_tce_get(struct iommu_table *tbl, long index) { - return ((u64 *)tbl->it_base)[index - tbl->it_offset]; + return *(pnv_tce(tbl, index - tbl->it_offset)); } struct iommu_table *pnv_pci_table_alloc(int nid) -- 2.4.0.rc3.8.gfb3e7d5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/