From 2fd0c9d966cc11bb5f73556dd788d12f501d8755 Mon Sep 17 00:00:00 2001 From: Niklas Cassel Date: Wed, 20 Dec 2017 00:29:25 +0100 Subject: [PATCH] PCI: designware-ep: Pre-allocate memory for MSI in dw_pcie_ep_init Certain SoCs need to map the MSI address in raise_irq. To map an address, you first need to call pci_epc_mem_alloc_addr(), however, pci_epc_mem_alloc_addr() calls ioremap() (which can sleep). Since raise_irq is only called from atomic context, we can't call pci_epc_mem_alloc_addr() from raise_irq. Pre-allocate a page in dw_pcie_ep_init(), so that this page can later be used to map/unmap the MSI address in raise_irq. Tested-by: Gustavo Pimentel Signed-off-by: Niklas Cassel Signed-off-by: Lorenzo Pieralisi Acked-by: Joao Pinto --- drivers/pci/dwc/pcie-designware-ep.c | 10 ++++++++++ drivers/pci/dwc/pcie-designware.h | 2 ++ 2 files changed, 12 insertions(+) diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index 3fb34be..8d8019c 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -286,6 +286,9 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep) { struct pci_epc *epc = ep->epc; + pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem, + epc->mem->page_size); + pci_epc_mem_exit(epc); } @@ -341,6 +344,13 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) return ret; } + ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys, + epc->mem->page_size); + if (!ep->msi_mem) { + dev_err(dev, "Failed to reserve memory for MSI\n"); + return -ENOMEM; + } + ep->epc = epc; epc_set_drvdata(epc, ep); dw_pcie_setup(pci); diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index 9aaf0cd..5a1da45 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -198,6 +198,8 @@ struct dw_pcie_ep { unsigned long ob_window_map; u32 num_ib_windows; u32 num_ob_windows; + void __iomem *msi_mem; + phys_addr_t msi_mem_phys; }; struct dw_pcie_ops { -- 2.7.4