Hi,
Às 11:29 PM de 12/19/2017, Niklas Cassel escreveu:
> 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.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
> ---
> 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 3fb34be99715..8d8019cdff2a 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 9aaf0cd04dd6..5a1da459eda5 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 {
>
Acked-by: Joao Pinto <jpinto@xxxxxxxxxxxx>
