On Mon, Sep 02, 2019 at 11:17:09AM +0800, Xiaowei Bao wrote:
> Each PF of EP device should have it's own MSI or MSIX capabitily
> struct, so create a dw_pcie_ep_func struct and remover the msi_cap
remover?
> and msix_cap to this struce, and manage the PFs with a list.
struce?
>
> Signed-off-by: Xiaowei Bao
> ---
> v1:
> - This is a new patch, to fix the issue of MSI and MSIX CAP way of
>finding.
> v2:
> - No change.
> v3:
> - No change.
This makes it look like you introduced the patch in v1 and haven't
changed it since.
I think it's more common to have a history like this:
---
v3:
- Introduced new patch, to fix the issue of MSI and MSIX CAP way of
finding.
>
> drivers/pci/controller/dwc/pcie-designware-ep.c | 135
> +---
> drivers/pci/controller/dwc/pcie-designware.h| 18 +++-
> 2 files changed, 134 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c
> b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index c3bc7bd..144eb12 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -19,6 +19,19 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
> pci_epc_linkup(epc);
> }
>
> +struct dw_pcie_ep_func *
> +dw_pcie_ep_get_func_from_ep(struct dw_pcie_ep *ep, u8 func_no)
> +{
> + struct dw_pcie_ep_func *ep_func;
> +
> + list_for_each_entry(ep_func, &ep->func_list, list) {
> + if (ep_func->func_no == func_no)
> + return ep_func;
> + }
> +
> + return NULL;
> +}
> +
> static unsigned int dw_pcie_ep_func_select(struct dw_pcie_ep *ep, u8 func_no)
> {
> unsigned int func_offset = 0;
> @@ -59,6 +72,47 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum
> pci_barno bar)
> __dw_pcie_ep_reset_bar(pci, func_no, bar, 0);
> }
>
> +static u8 __dw_pcie_ep_find_next_cap(struct dw_pcie_ep *ep, u8 func_no,
> + u8 cap_ptr, u8 cap)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> + unsigned int func_offset = 0;
> + u8 cap_id, next_cap_ptr;
> + u16 reg;
> +
> + if (!cap_ptr)
> + return 0;
> +
> + func_offset = dw_pcie_ep_func_select(ep, func_no);
> +
> + reg = dw_pcie_readw_dbi(pci, func_offset + cap_ptr);
> + cap_id = (reg & 0x00ff);
> +
> + if (cap_id > PCI_CAP_ID_MAX)
> + return 0;
> +
> + if (cap_id == cap)
> + return cap_ptr;
> +
> + next_cap_ptr = (reg & 0xff00) >> 8;
> + return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
> +}
Which tree have you based this patchset on? v5.3-rc3 and pci/dwc both already
have this function (without the func_no). See beb4641a787d
("PCI: dwc: Add MSI-X callbacks handler").
> +
> +static u8 dw_pcie_ep_find_capability(struct dw_pcie_ep *ep, u8 func_no, u8
> cap)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> + unsigned int func_offset = 0;
> + u8 next_cap_ptr;
> + u16 reg;
> +
> + func_offset = dw_pcie_ep_func_select(ep, func_no);
> +
> + reg = dw_pcie_readw_dbi(pci, func_offset + PCI_CAPABILITY_LIST);
> + next_cap_ptr = (reg & 0x00ff);
> +
> + return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
> +}
> +
> static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
> struct pci_epf_header *hdr)
> {
> @@ -246,13 +300,18 @@ static int dw_pcie_ep_get_msi(struct pci_epc *epc, u8
> func_no)
> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> u32 val, reg;
> unsigned int func_offset = 0;
> + struct dw_pcie_ep_func *ep_func;
>
> - if (!ep->msi_cap)
> + ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
> + if (!ep_func)
> + return -EINVAL;
> +
> + if (!ep_func->msi_cap)
> return -EINVAL;
>
> func_offset = dw_pcie_ep_func_select(ep, func_no);
>
> - reg = ep->msi_cap + func_offset + PCI_MSI_FLAGS;
> + reg = ep_func->msi_cap + func_offset + PCI_MSI_FLAGS;
> val = dw_pcie_readw_dbi(pci, reg);
> if (!(val & PCI_MSI_FLAGS_ENABLE))
> return -EINVAL;
> @@ -268,13 +327,18 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8
> func_no, u8 interrupts)
> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> u32 val, reg;
> unsigned int func_offset = 0;
> + struct dw_pcie_ep_func *ep_func;
> +
> + ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
> + if (!ep_func)
> + return -EINVAL;
>
> - if (!ep->msi_cap)
> + if (!ep_func->msi_cap)
> return -EINVAL;
>
> func_offset = dw_pcie_ep_func_select(ep, func_no);
>
> - reg = ep->msi_cap + func_offset + PCI_MSI_FLAGS;
> + reg = ep_func->msi_cap + func_offset + PCI_MSI_FLAGS;
> val = dw_pcie_readw_dbi(pci, reg);
> val &= ~PCI_MSI_FLAGS_QMASK;
> val |= (interrupts << 1) & PCI_MSI_FLAGS_QMASK;
> @@ -291,13 +35
