Hi Niklas,
On Monday 30 October 2017 06:12 PM, Niklas Cassel wrote:
> 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, instead we pre-allocate
> a page in dw_pcie_ep_init, so this page can later be used to map/unmap
> the MSI address in raise_irq.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
> ---
> V2:
> * No change.
>
> drivers/pci/dwc/pcie-designware-ep.c | 8 ++++++++
> drivers/pci/dwc/pcie-designware.h | 2 ++
> 2 files changed, 10 insertions(+)
>
> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> index 3fb34be99715..c291da2a10ba 100644
> --- a/drivers/pci/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/dwc/pcie-designware-ep.c
> @@ -286,6 +286,8 @@ 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, PAGE_SIZE);
> +
> pci_epc_mem_exit(epc);
> }
>
> @@ -341,6 +343,12 @@ 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, PAGE_SIZE);
ep->page_size instead of PAGE_SIZE?
Thanks
Kishon
