IPROC host has the limitation that it can use only those address ranges given by dma-ranges property as inbound address. So that the memory address holes in dma-ranges should be reserved to allocate as DMA address.
All such reserved addresses are created as resource entries and add to dma_resv list of pci host bridge. These dma reserve resources created by parsing dma-ranges parameter. Ex: dma-ranges = < \ 0x43000000 0x00 0x80000000 0x00 0x80000000 0x00 0x80000000 \ 0x43000000 0x08 0x00000000 0x08 0x00000000 0x08 0x00000000 \ 0x43000000 0x80 0x00000000 0x80 0x00000000 0x40 0x00000000> In the above example of dma-ranges, memory address from 0x0 - 0x80000000, 0x100000000 - 0x800000000, 0x1000000000 - 0x8000000000 and 0x10000000000 - 0xffffffffffffffff. are not allowed to use as inbound addresses. So that we need to add these address range to dma_resv list to reserve their IOVA address ranges. Signed-off-by: Srinath Mannam <[email protected]> --- drivers/pci/controller/pcie-iproc.c | 49 +++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c index 3160e93..43e465a 100644 --- a/drivers/pci/controller/pcie-iproc.c +++ b/drivers/pci/controller/pcie-iproc.c @@ -1154,25 +1154,74 @@ static int iproc_pcie_setup_ib(struct iproc_pcie *pcie, return ret; } +static int +iproc_pcie_add_dma_resv_range(struct device *dev, struct list_head *resources, + uint64_t start, uint64_t end) +{ + struct resource *res; + + res = devm_kzalloc(dev, sizeof(struct resource), GFP_KERNEL); + if (!res) + return -ENOMEM; + + res->start = (resource_size_t)start; + res->end = (resource_size_t)end; + pci_add_resource_offset(resources, res, 0); + + return 0; +} + static int iproc_pcie_map_dma_ranges(struct iproc_pcie *pcie) { + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); struct of_pci_range range; struct of_pci_range_parser parser; int ret; + uint64_t start, end; + LIST_HEAD(resources); /* Get the dma-ranges from DT */ ret = of_pci_dma_range_parser_init(&parser, pcie->dev->of_node); if (ret) return ret; + start = 0; for_each_of_pci_range(&parser, &range) { + end = range.pci_addr; + /* dma-ranges list expected in sorted order */ + if (end < start) { + ret = -EINVAL; + goto out; + } /* Each range entry corresponds to an inbound mapping region */ ret = iproc_pcie_setup_ib(pcie, &range, IPROC_PCIE_IB_MAP_MEM); if (ret) return ret; + + if (end - start) { + ret = iproc_pcie_add_dma_resv_range(pcie->dev, + &resources, + start, end); + if (ret) + goto out; + } + start = range.pci_addr + range.size; } + end = ~0; + if (end - start) { + ret = iproc_pcie_add_dma_resv_range(pcie->dev, &resources, + start, end); + if (ret) + goto out; + } + + list_splice_init(&resources, &host->dma_resv); + return 0; +out: + pci_free_resource_list(&resources); + return ret; } static int iproce_pcie_get_msi(struct iproc_pcie *pcie, -- 2.7.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
