From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp09.in.ibm.com ([122.248.162.9]:33851 "EHLO e28smtp09.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030282AbbKDNzn (ORCPT ); Wed, 4 Nov 2015 08:55:43 -0500 Received: from /spool/local by e28smtp09.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 4 Nov 2015 19:25:41 +0530 From: Gavin Shan To: linuxppc-dev@lists.ozlabs.org Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, benh@kernel.crashing.org, mpe@ellerman.id.au, aik@ozlabs.ru, bhelgaas@google.com, grant.likely@linaro.org, robherring2@gmail.com, panto@antoniou-consulting.com, frowand.list@gmail.com, Gavin Shan Subject: [PATCH v7 17/50] powerpc/powernv: Avoid calculating DMA32 segments on PHB3 Date: Thu, 5 Nov 2015 00:12:17 +1100 Message-Id: <1446642770-4681-18-git-send-email-gwshan@linux.vnet.ibm.com> In-Reply-To: <1446642770-4681-1-git-send-email-gwshan@linux.vnet.ibm.com> References: <1446642770-4681-1-git-send-email-gwshan@linux.vnet.ibm.com> Sender: linux-pci-owner@vger.kernel.org List-ID: In pnv_ioda_setup_dma(), it's unnecessary to calculate the DMA32 segments for PEs on PHB3 as the whole available DMA32 space can be assigned to one specific PE on PHB3. This splits pnv_ioda_setup_dma() to pnv_pci_ioda1_setup_dma() and pnv_pci_ioda2_setup_dma() in order to avoid calculating DMA32 segments for PEs on PHB3. No logical changes introduced. Signed-off-by: Gavin Shan --- arch/powerpc/platforms/powernv/pci-ioda.c | 41 ++++++++++++++++++------------- 1 file changed, 24 insertions(+), 17 deletions(-) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 5a08e20..4c2e023 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -2383,7 +2383,7 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, pnv_ioda_setup_bus_dma(pe, pe->pbus); } -static void pnv_ioda_setup_dma(struct pnv_phb *phb) +static void pnv_pci_ioda1_setup_dma(struct pnv_phb *phb) { struct pci_controller *hose = phb->hose; unsigned int residual, remaining, segs, tw, base; @@ -2428,26 +2428,30 @@ static void pnv_ioda_setup_dma(struct pnv_phb *phb) segs = remaining; } - /* - * For IODA2 compliant PHB3, we needn't care about the weight. - * The all available 32-bits DMA space will be assigned to - * the specific PE. - */ - if (phb->type == PNV_PHB_IODA1) { - pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n", - pe->dma_weight, segs); - pnv_pci_ioda1_setup_dma_pe(phb, pe, base, segs); - } else { - pe_info(pe, "Assign DMA32 space\n"); - segs = 0; - pnv_pci_ioda2_setup_dma_pe(phb, pe); - } + pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n", + pe->dma_weight, segs); + pnv_pci_ioda1_setup_dma_pe(phb, pe, base, segs); remaining -= segs; base += segs; } } +static void pnv_pci_ioda2_setup_dma(struct pnv_phb *phb) +{ + struct pnv_ioda_pe *pe; + + pnv_pci_ioda_setup_opal_tce_kill(phb); + + list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) { + if (!pe->dma_weight) + continue; + + pe_info(pe, "Assign DMA32 space\n"); + pnv_pci_ioda2_setup_dma_pe(phb, pe); + } +} + #ifdef CONFIG_PCI_MSI static void pnv_ioda2_msi_eoi(struct irq_data *d) { @@ -2931,10 +2935,13 @@ static void pnv_pci_ioda_setup_DMA(void) struct pnv_phb *phb; list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { - pnv_ioda_setup_dma(hose->private_data); + phb = hose->private_data; + if (phb->type == PNV_PHB_IODA1) + pnv_pci_ioda1_setup_dma(phb); + else + pnv_pci_ioda2_setup_dma(phb); /* Mark the PHB initialization done */ - phb = hose->private_data; phb->initialized = 1; } } -- 2.1.0