Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932703AbbBPKLy (ORCPT ); Mon, 16 Feb 2015 05:11:54 -0500 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:45530 "EHLO e23smtp09.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932340AbbBPKHv (ORCPT ); Mon, 16 Feb 2015 05:07:51 -0500 From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Cc: Alexey Kardashevskiy , Benjamin Herrenschmidt , Paul Mackerras , Alex Williamson , Gavin Shan , Alexander Graf , linux-kernel@vger.kernel.org Subject: [PATCH v4 19/28] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_create_table Date: Mon, 16 Feb 2015 21:06:11 +1100 Message-Id: <1424081180-4494-20-git-send-email-aik@ozlabs.ru> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1424081180-4494-1-git-send-email-aik@ozlabs.ru> References: <1424081180-4494-1-git-send-email-aik@ozlabs.ru> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15021610-0033-0000-0000-0000010FA4F3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4348 Lines: 147 This is a part of moving TCE table allocation into an iommu_ops callback to support multiple IOMMU groups per one VFIO container. This is a mechanical patch. Signed-off-by: Alexey Kardashevskiy --- arch/powerpc/platforms/powernv/pci-ioda.c | 88 +++++++++++++++++++++++-------- 1 file changed, 65 insertions(+), 23 deletions(-) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index ebfea0a..95d9119 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -1295,6 +1295,62 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb, __free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs)); } +static long pnv_pci_ioda2_create_table(struct pnv_ioda_pe *pe, + __u32 page_shift, __u32 window_shift, + struct iommu_table *tbl) +{ + int nid = pe->phb->hose->node; + struct page *tce_mem = NULL; + void *addr; + unsigned long tce_table_size; + int64_t rc; + unsigned order; + + if ((page_shift != 12) && (page_shift != 16) && (page_shift != 24)) + return -EINVAL; + + if ((1ULL << window_shift) > memory_hotplug_max()) + return -EINVAL; + + tce_table_size = (1ULL << (window_shift - page_shift)) * 8; + tce_table_size = max(0x1000UL, tce_table_size); + + /* Allocate TCE table */ + order = get_order(tce_table_size); + + tce_mem = alloc_pages_node(nid, GFP_KERNEL, order); + if (!tce_mem) { + pr_err("Failed to allocate a TCE memory, order=%d\n", order); + rc = -ENOMEM; + goto fail; + } + addr = page_address(tce_mem); + memset(addr, 0, tce_table_size); + + /* Setup linux iommu table */ + pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0, + page_shift); + + tbl->it_ops = &pnv_ioda2_iommu_ops; + iommu_init_table(tbl, nid); + + return 0; +fail: + if (tce_mem) + __free_pages(tce_mem, get_order(tce_table_size)); + + return rc; +} + +static void pnv_pci_ioda2_free_table(struct iommu_table *tbl) +{ + if (!tbl->it_size) + return; + + free_pages(tbl->it_base, get_order(tbl->it_size << 3)); + memset(tbl, 0, sizeof(struct iommu_table)); +} + static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable) { uint16_t window_id = (pe->pe_number << 1 ) + 1; @@ -1365,11 +1421,9 @@ static struct powerpc_iommu_ops pnv_pci_ioda2_ops = { static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe) { - struct page *tce_mem = NULL; - void *addr; const __be64 *swinvp; - struct iommu_table *tbl; - unsigned int tce_table_size, end; + unsigned int end; + struct iommu_table *tbl = &pe->iommu.tables[0]; int64_t rc; /* We shouldn't already have a 32-bit DMA associated */ @@ -1378,31 +1432,20 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, /* The PE will reserve all possible 32-bits space */ pe->tce32_seg = 0; + end = (1 << ilog2(phb->ioda.m32_pci_base)); - tce_table_size = (end / 0x1000) * 8; pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n", end); - /* Allocate TCE table */ - tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL, - get_order(tce_table_size)); - if (!tce_mem) { - pe_err(pe, "Failed to allocate a 32-bit TCE memory\n"); - goto fail; + rc = pnv_pci_ioda2_create_table(pe, IOMMU_PAGE_SHIFT_4K, + ilog2(phb->ioda.m32_pci_base), tbl); + if (rc) { + pe_err(pe, "Failed to create 32-bit TCE table, err %ld", rc); + return; } - addr = page_address(tce_mem); - memset(addr, 0, tce_table_size); /* Setup iommu */ pe->iommu.tables[0].it_iommu = &pe->iommu; - - /* Setup linux iommu table */ - tbl = &pe->iommu.tables[0]; - pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0, - IOMMU_PAGE_SHIFT_4K); - - tbl->it_ops = &pnv_ioda2_iommu_ops; - iommu_init_table(tbl, phb->hose->node); pe->iommu.ops = &pnv_pci_ioda2_ops; /* @@ -1447,8 +1490,7 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, fail: if (pe->tce32_seg >= 0) pe->tce32_seg = -1; - if (tce_mem) - __free_pages(tce_mem, get_order(tce_table_size)); + pnv_pci_ioda2_free_table(tbl); } static void pnv_ioda_setup_dma(struct pnv_phb *phb) -- 2.0.0 -- 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/