On Wednesday, December 20, 2017 2:30 PM, Joao Pinto wrote:
>
> 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>
Acked-by: Jingoo Han <jingoohan1@xxxxxxxxx>
Best regards,
Jingoo Han
