RE: [PATCH 01/10] PCI: designware-ep: Add multiple PFs support for DWC

From: Xiaowei Bao
Date: Thu Aug 15 2019 - 22:57:47 EST

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In reply to: Andrew Murray: "Re: [PATCH 01/10] PCI: designware-ep: Add multiple PFs support for DWC"
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> -----Original Message-----
> From: Andrew Murray <andrew.murray@xxxxxxx>
> Sent: 2019年8月15日 19:32
> To: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> Cc: jingoohan1@xxxxxxxxx; gustavo.pimentel@xxxxxxxxxxxx;
> bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
> shawnguo@xxxxxxxxxx; Leo Li <leoyang.li@xxxxxxx>; kishon@xxxxxx;
> lorenzo.pieralisi@xxxxxxx; arnd@xxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
> M.h. Lian <minghuan.lian@xxxxxxx>; Mingkai Hu <mingkai.hu@xxxxxxx>;
> Roy Zang <roy.zang@xxxxxxx>; linux-pci@xxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx
> Subject: Re: [PATCH 01/10] PCI: designware-ep: Add multiple PFs support for
> DWC
>
> On Thu, Aug 15, 2019 at 04:37:07PM +0800, Xiaowei Bao wrote:
> > Add multiple PFs support for DWC, different PF have different config
> > space, we use pf-offset property which get from the DTS to access the
> > different pF config space.
>
> Thanks for the patch. I haven't seen a cover letter for this series, is there one
> missing?
Maybe I miss, I will add you to review next time, thanks a lot for your comments.
>
>
> >
> > Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> > ---
> > drivers/pci/controller/dwc/pcie-designware-ep.c | 97
> +++++++++++++---------
> > drivers/pci/controller/dwc/pcie-designware.c | 105
> ++++++++++++++++++++++--
> > drivers/pci/controller/dwc/pcie-designware.h | 10 ++-
> > include/linux/pci-epc.h | 1 +
> > 4 files changed, 164 insertions(+), 49 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > index 2bf5a35..75e2955 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > @@ -19,12 +19,14 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
> > pci_epc_linkup(epc);
> > }
> >
> > -static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno
> bar,
> > - int flags)
> > +static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, u8 func_no,
> > + enum pci_barno bar, int flags)
> > {
> > u32 reg;
> > + struct pci_epc *epc = pci->ep.epc;
> > + u32 pf_base = func_no * epc->pf_offset;
> >
> > - reg = PCI_BASE_ADDRESS_0 + (4 * bar);
> > + reg = pf_base + PCI_BASE_ADDRESS_0 + (4 * bar);
>
> I think I'd rather see this arithmetic (and the one for determining pf_base)
> inside a macro or inline header function. This would make this code more
> readable and reduce the chances of an error by avoiding duplication of code.
>
> For example look at cdns_pcie_ep_fn_writeb and
> ROCKCHIP_PCIE_EP_FUNC_BASE for examples of other EP drivers that do
> this.
Agree, this looks fine, thanks a lot for your comments, I will use this way to access
the registers in next version patch.
>
>
> > dw_pcie_dbi_ro_wr_en(pci);
> > dw_pcie_writel_dbi2(pci, reg, 0x0);
> > dw_pcie_writel_dbi(pci, reg, 0x0);
> > @@ -37,7 +39,12 @@ static void __dw_pcie_ep_reset_bar(struct dw_pcie
> > *pci, enum pci_barno bar,
> >
> > void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar) {
> > - __dw_pcie_ep_reset_bar(pci, bar, 0);
> > + u8 func_no, funcs;
> > +
> > + funcs = pci->ep.epc->max_functions;
> > +
> > + for (func_no = 0; func_no < funcs; func_no++)
> > + __dw_pcie_ep_reset_bar(pci, func_no, bar, 0);
> > }
> >
> > static u8 __dw_pcie_ep_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
> > @@ -78,28 +85,29 @@ static int dw_pcie_ep_write_header(struct pci_epc
> > *epc, u8 func_no, {
> > struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > + u32 pf_base = func_no * epc->pf_offset;
> >
> > dw_pcie_dbi_ro_wr_en(pci);
> > - dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, hdr->vendorid);
> > - dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, hdr->deviceid);
> > - dw_pcie_writeb_dbi(pci, PCI_REVISION_ID, hdr->revid);
> > - dw_pcie_writeb_dbi(pci, PCI_CLASS_PROG, hdr->progif_code);
> > - dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE,
> > + dw_pcie_writew_dbi(pci, pf_base + PCI_VENDOR_ID, hdr->vendorid);
> > + dw_pcie_writew_dbi(pci, pf_base + PCI_DEVICE_ID, hdr->deviceid);
> > + dw_pcie_writeb_dbi(pci, pf_base + PCI_REVISION_ID, hdr->revid);
> > + dw_pcie_writeb_dbi(pci, pf_base + PCI_CLASS_PROG, hdr->progif_code);
> > + dw_pcie_writew_dbi(pci, pf_base + PCI_CLASS_DEVICE,
> > hdr->subclass_code | hdr->baseclass_code << 8);
> > - dw_pcie_writeb_dbi(pci, PCI_CACHE_LINE_SIZE,
> > + dw_pcie_writeb_dbi(pci, pf_base + PCI_CACHE_LINE_SIZE,
> > hdr->cache_line_size);
> > - dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_VENDOR_ID,
> > + dw_pcie_writew_dbi(pci, pf_base + PCI_SUBSYSTEM_VENDOR_ID,
> > hdr->subsys_vendor_id);
> > - dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_ID, hdr->subsys_id);
> > - dw_pcie_writeb_dbi(pci, PCI_INTERRUPT_PIN,
> > + dw_pcie_writew_dbi(pci, pf_base + PCI_SUBSYSTEM_ID,
> hdr->subsys_id);
> > + dw_pcie_writeb_dbi(pci, pf_base + PCI_INTERRUPT_PIN,
> > hdr->interrupt_pin);
> > dw_pcie_dbi_ro_wr_dis(pci);
> >
> > return 0;
> > }
> >
> > -static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, enum
> pci_barno bar,
> > - dma_addr_t cpu_addr,
> > +static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no,
> > + enum pci_barno bar, dma_addr_t cpu_addr,
> > enum dw_pcie_as_type as_type)
> > {
> > int ret;
> > @@ -112,7 +120,7 @@ static int dw_pcie_ep_inbound_atu(struct
> dw_pcie_ep *ep, enum pci_barno bar,
> > return -EINVAL;
> > }
> >
> > - ret = dw_pcie_prog_inbound_atu(pci, free_win, bar, cpu_addr,
> > + ret = dw_pcie_prog_inbound_atu(pci, func_no, free_win, bar,
> > +cpu_addr,
> > as_type);
> > if (ret < 0) {
> > dev_err(pci->dev, "Failed to program IB window\n"); @@ -125,7
> > +133,8 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep,
> enum pci_barno bar,
> > return 0;
> > }
> >
> > -static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t
> > phys_addr,
> > +static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, u8 func_no,
> > + phys_addr_t phys_addr,
> > u64 pci_addr, size_t size)
> > {
> > u32 free_win;
> > @@ -137,8 +146,8 @@ static int dw_pcie_ep_outbound_atu(struct
> dw_pcie_ep *ep, phys_addr_t phys_addr,
> > return -EINVAL;
> > }
> >
> > - dw_pcie_prog_outbound_atu(pci, free_win, PCIE_ATU_TYPE_MEM,
> > - phys_addr, pci_addr, size);
> > + dw_pcie_prog_ep_outbound_atu(pci, func_no, free_win,
> PCIE_ATU_TYPE_MEM,
> > + phys_addr, pci_addr, size);
> >
> > set_bit(free_win, ep->ob_window_map);
> > ep->outbound_addr[free_win] = phys_addr; @@ -154,7 +163,7 @@
> static
> > void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
> > enum pci_barno bar = epf_bar->barno;
> > u32 atu_index = ep->bar_to_atu[bar];
> >
> > - __dw_pcie_ep_reset_bar(pci, bar, epf_bar->flags);
> > + __dw_pcie_ep_reset_bar(pci, func_no, bar, epf_bar->flags);
> >
> > dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_INBOUND);
> > clear_bit(atu_index, ep->ib_window_map); @@ -170,14 +179,16 @@
> > static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
> > size_t size = epf_bar->size;
> > int flags = epf_bar->flags;
> > enum dw_pcie_as_type as_type;
> > - u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar);
> > + u32 pf_base = func_no * epc->pf_offset;
> > + u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar) + pf_base;
> >
> > if (!(flags & PCI_BASE_ADDRESS_SPACE))
> > as_type = DW_PCIE_AS_MEM;
> > else
> > as_type = DW_PCIE_AS_IO;
> >
> > - ret = dw_pcie_ep_inbound_atu(ep, bar, epf_bar->phys_addr, as_type);
> > + ret = dw_pcie_ep_inbound_atu(ep, func_no, bar,
> > + epf_bar->phys_addr, as_type);
> > if (ret)
> > return ret;
> >
> > @@ -235,7 +246,7 @@ static int dw_pcie_ep_map_addr(struct pci_epc
> *epc, u8 func_no,
> > struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> >
> > - ret = dw_pcie_ep_outbound_atu(ep, addr, pci_addr, size);
> > + ret = dw_pcie_ep_outbound_atu(ep, func_no, addr, pci_addr, size);
> > if (ret) {
> > dev_err(pci->dev, "Failed to enable address\n");
> > return ret;
> > @@ -248,12 +259,13 @@ static int dw_pcie_ep_get_msi(struct pci_epc
> > *epc, u8 func_no) {
> > struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > + u32 pf_base = func_no * epc->pf_offset;
> > u32 val, reg;
> >
> > if (!ep->msi_cap)
> > return -EINVAL;
> >
> > - reg = ep->msi_cap + PCI_MSI_FLAGS;
> > + reg = ep->msi_cap + pf_base + PCI_MSI_FLAGS;
> > val = dw_pcie_readw_dbi(pci, reg);
> > if (!(val & PCI_MSI_FLAGS_ENABLE))
> > return -EINVAL;
> > @@ -267,12 +279,13 @@ static int dw_pcie_ep_set_msi(struct pci_epc
> > *epc, u8 func_no, u8 interrupts) {
> > struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > + u32 pf_base = func_no * epc->pf_offset;
> > u32 val, reg;
> >
> > if (!ep->msi_cap)
> > return -EINVAL;
> >
> > - reg = ep->msi_cap + PCI_MSI_FLAGS;
> > + reg = ep->msi_cap + pf_base + PCI_MSI_FLAGS;
> > val = dw_pcie_readw_dbi(pci, reg);
> > val &= ~PCI_MSI_FLAGS_QMASK;
> > val |= (interrupts << 1) & PCI_MSI_FLAGS_QMASK; @@ -287,12 +300,13
> > @@ static int dw_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no) {
> > struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > + u32 pf_base = func_no * epc->pf_offset;
> > u32 val, reg;
> >
> > if (!ep->msix_cap)
> > return -EINVAL;
> >
> > - reg = ep->msix_cap + PCI_MSIX_FLAGS;
> > + reg = ep->msix_cap + pf_base + PCI_MSIX_FLAGS;
> > val = dw_pcie_readw_dbi(pci, reg);
> > if (!(val & PCI_MSIX_FLAGS_ENABLE))
> > return -EINVAL;
> > @@ -306,12 +320,13 @@ static int dw_pcie_ep_set_msix(struct pci_epc
> > *epc, u8 func_no, u16 interrupts) {
> > struct dw_pcie_ep *ep = epc_get_drvdata(epc);
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > + u32 pf_base = func_no * epc->pf_offset;
> > u32 val, reg;
> >
> > if (!ep->msix_cap)
> > return -EINVAL;
> >
> > - reg = ep->msix_cap + PCI_MSIX_FLAGS;
> > + reg = ep->msix_cap + pf_base + PCI_MSIX_FLAGS;
> > val = dw_pcie_readw_dbi(pci, reg);
> > val &= ~PCI_MSIX_FLAGS_QSIZE;
> > val |= interrupts;
> > @@ -400,6 +415,7 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep
> *ep, u8 func_no,
> > unsigned int aligned_offset;
> > u16 msg_ctrl, msg_data;
> > u32 msg_addr_lower, msg_addr_upper, reg;
> > + u32 pf_base = func_no * epc->pf_offset;
> > u64 msg_addr;
> > bool has_upper;
> > int ret;
> > @@ -408,19 +424,19 @@ int dw_pcie_ep_raise_msi_irq(struct
> dw_pcie_ep *ep, u8 func_no,
> > return -EINVAL;
> >
> > /* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */
> > - reg = ep->msi_cap + PCI_MSI_FLAGS;
> > + reg = ep->msi_cap + pf_base + PCI_MSI_FLAGS;
> > msg_ctrl = dw_pcie_readw_dbi(pci, reg);
> > has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT);
> > - reg = ep->msi_cap + PCI_MSI_ADDRESS_LO;
> > + reg = ep->msi_cap + pf_base + PCI_MSI_ADDRESS_LO;
> > msg_addr_lower = dw_pcie_readl_dbi(pci, reg);
> > if (has_upper) {
> > - reg = ep->msi_cap + PCI_MSI_ADDRESS_HI;
> > + reg = ep->msi_cap + pf_base + PCI_MSI_ADDRESS_HI;
> > msg_addr_upper = dw_pcie_readl_dbi(pci, reg);
> > - reg = ep->msi_cap + PCI_MSI_DATA_64;
> > + reg = ep->msi_cap + pf_base + PCI_MSI_DATA_64;
> > msg_data = dw_pcie_readw_dbi(pci, reg);
> > } else {
> > msg_addr_upper = 0;
> > - reg = ep->msi_cap + PCI_MSI_DATA_32;
> > + reg = ep->msi_cap + pf_base + PCI_MSI_DATA_32;
> > msg_data = dw_pcie_readw_dbi(pci, reg);
> > }
> > aligned_offset = msg_addr_lower & (epc->mem->page_size - 1); @@
> > -439,7 +455,7 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep,
> > u8 func_no, }
> >
> > int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
> > - u16 interrupt_num)
> > + u16 interrupt_num)
> > {
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > struct pci_epc *epc = ep->epc;
> > @@ -447,16 +463,17 @@ int dw_pcie_ep_raise_msix_irq(struct
> dw_pcie_ep *ep, u8 func_no,
> > u32 bar_addr_upper, bar_addr_lower;
> > u32 msg_addr_upper, msg_addr_lower;
> > u32 reg, msg_data, vec_ctrl;
> > + u32 pf_base = func_no * epc->pf_offset;
> > u64 tbl_addr, msg_addr, reg_u64;
> > void __iomem *msix_tbl;
> > int ret;
> >
> > - reg = ep->msix_cap + PCI_MSIX_TABLE;
> > + reg = ep->msix_cap + pf_base + PCI_MSIX_TABLE;
> > tbl_offset = dw_pcie_readl_dbi(pci, reg);
> > bir = (tbl_offset & PCI_MSIX_TABLE_BIR);
> > tbl_offset &= PCI_MSIX_TABLE_OFFSET;
> >
> > - reg = PCI_BASE_ADDRESS_0 + (4 * bir);
> > + reg = PCI_BASE_ADDRESS_0 + pf_base + (4 * bir);
> > bar_addr_upper = 0;
> > bar_addr_lower = dw_pcie_readl_dbi(pci, reg);
> > reg_u64 = (bar_addr_lower & PCI_BASE_ADDRESS_MEM_TYPE_MASK);
> @@
> > -592,13 +609,17 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> > ep->epc = epc;
> > epc_set_drvdata(epc, ep);
> >
> > - if (ep->ops->ep_init)
> > - ep->ops->ep_init(ep);
> > -
> > ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
> > if (ret < 0)
> > epc->max_functions = 1;
> >
> > + ret = of_property_read_u32(np, "pf-offset", &epc->pf_offset);
> > + if (ret < 0)
> > + epc->pf_offset = 0;
>
> Bad things will likely happen if max_functions > 1 and pf-offset isn't set.
> I think the driver should bail in this situation. It would be very easy for
> someone to misconfigure this.
Yes, you are right, but if the max-functions have defined in DTS, require the pf-offset
must define in DTS, I am not sure the correct value of pf-offsetfor other platforms,
so I think the max-functions and pf-offset should not have the dependence.
even though I didn't define pf-offset when I defined max-functions, the pf-offset is 0,
the DWC ep driver can continue run the progress of INIT but not return, of course,
thus the PF1 will not work, I don't know which way is better.
>
>
> > +
> > + if (ep->ops->ep_init)
> > + ep->ops->ep_init(ep);
> > +
> > ret = __pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
> > ep->page_size);
> > if (ret < 0) {
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c
> > b/drivers/pci/controller/dwc/pcie-designware.c
> > index 7d25102..c99cee4 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -158,6 +158,43 @@ static void dw_pcie_writel_ob_unroll(struct
> dw_pcie *pci, u32 index, u32 reg,
> > dw_pcie_writel_atu(pci, offset + reg, val); }
> >
> > +static void dw_pcie_prog_ep_outbound_atu_unroll(struct dw_pcie *pci, u8
> func_no,
> > + int index, int type,
> > + u64 cpu_addr, u64 pci_addr,
> > + u32 size)
> > +{
> > + u32 retries, val;
> > +
> > + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
> > + lower_32_bits(cpu_addr));
> > + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
> > + upper_32_bits(cpu_addr));
> > + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LIMIT,
> > + lower_32_bits(cpu_addr + size - 1));
> > + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
> > + lower_32_bits(pci_addr));
> > + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
> > + upper_32_bits(pci_addr));
> > + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
> > + type | PCIE_ATU_FUNC_NUM(func_no));
>
> With the exception of this line, the rest of this function is identical to
> dw_pcie_prog_outbound_atu_unroll.
Yes, I can integrate the same code, but I think we'd better use the different outbound
window set function between RC and EP, because the RC don't need the func_num parameter.
>
> > + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
> > + PCIE_ATU_ENABLE);
> > +
> > + /*
> > + * Make sure ATU enable takes effect before any subsequent config
> > + * and I/O accesses.
> > + */
> > + for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
> > + val = dw_pcie_readl_ob_unroll(pci, index,
> > + PCIE_ATU_UNR_REGION_CTRL2);
> > + if (val & PCIE_ATU_ENABLE)
> > + return;
> > +
> > + mdelay(LINK_WAIT_IATU);
> > + }
> > + dev_err(pci->dev, "Outbound iATU is not being enabled\n"); }
> > +
> > static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int
> index,
> > int type, u64 cpu_addr,
> > u64 pci_addr, u32 size)
> > @@ -194,6 +231,51 @@ static void
> dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
> > dev_err(pci->dev, "Outbound iATU is not being enabled\n"); }
> >
> > +void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int
> index,
> > + int type, u64 cpu_addr, u64 pci_addr,
> > + u32 size)
> > +{
> > + u32 retries, val;
> > +
> > + if (pci->ops->cpu_addr_fixup)
> > + cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
> > +
> > + if (pci->iatu_unroll_enabled) {
> > + dw_pcie_prog_ep_outbound_atu_unroll(pci, func_no, index, type,
> > + cpu_addr, pci_addr, size);
> > + return;
> > + }
> > +
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT,
> > + PCIE_ATU_REGION_OUTBOUND | index);
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_BASE,
> > + lower_32_bits(cpu_addr));
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_BASE,
> > + upper_32_bits(cpu_addr));
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_LIMIT,
> > + lower_32_bits(cpu_addr + size - 1));
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET,
> > + lower_32_bits(pci_addr));
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET,
> > + upper_32_bits(pci_addr));
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type |
> > + PCIE_ATU_FUNC_NUM(func_no));
>
> The same here, this is identical to dw_pcie_prog_outbound_atu with the
> exception of this line.
>
> Is there a way you can avoid all of this duplicated code?
As above, I can integrate the same code, but I keep to think the different outbound
Window set function should be used between RC and EP.
>
> Thanks,
>
> Andrew Murray
>
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE);
> > +
> > + /*
> > + * Make sure ATU enable takes effect before any subsequent config
> > + * and I/O accesses.
> > + */
> > + for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
> > + val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
> > + if (val & PCIE_ATU_ENABLE)
> > + return;
> > +
> > + mdelay(LINK_WAIT_IATU);
> > + }
> > + dev_err(pci->dev, "Outbound iATU is not being enabled\n"); }
> > +
> > void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
> > u64 cpu_addr, u64 pci_addr, u32 size) { @@ -252,8
> +334,8
> > @@ static void dw_pcie_writel_ib_unroll(struct dw_pcie *pci, u32 index,
> u32 reg,
> > dw_pcie_writel_atu(pci, offset + reg, val); }
> >
> > -static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index,
> > - int bar, u64 cpu_addr,
> > +static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, u8
> func_no,
> > + int index, int bar, u64 cpu_addr,
> > enum dw_pcie_as_type as_type) {
> > int type;
> > @@ -275,8 +357,10 @@ static int dw_pcie_prog_inbound_atu_unroll(struct
> dw_pcie *pci, int index,
> > return -EINVAL;
> > }
> >
> > - dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
> type);
> > + dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
> type |
> > + PCIE_ATU_FUNC_NUM(func_no));
> > dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
> > + PCIE_ATU_FUNC_NUM_MATCH_EN |
> > PCIE_ATU_ENABLE |
> > PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
> >
> > @@ -297,14 +381,15 @@ static int
> dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index,
> > return -EBUSY;
> > }
> >
> > -int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
> > - u64 cpu_addr, enum dw_pcie_as_type as_type)
> > +int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > + int bar, u64 cpu_addr,
> > + enum dw_pcie_as_type as_type)
> > {
> > int type;
> > u32 retries, val;
> >
> > if (pci->iatu_unroll_enabled)
> > - return dw_pcie_prog_inbound_atu_unroll(pci, index, bar,
> > + return dw_pcie_prog_inbound_atu_unroll(pci, func_no, index, bar,
> > cpu_addr, as_type);
> >
> > dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT,
> PCIE_ATU_REGION_INBOUND |
> > @@ -323,9 +408,11 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie
> *pci, int index, int bar,
> > return -EINVAL;
> > }
> >
> > - dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type);
> > - dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE
> > - | PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type |
> > + PCIE_ATU_FUNC_NUM(func_no));
> > + dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE |
> > + PCIE_ATU_FUNC_NUM_MATCH_EN |
> > + PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
> >
> > /*
> > * Make sure ATU enable takes effect before any subsequent config
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.h
> > b/drivers/pci/controller/dwc/pcie-designware.h
> > index ffed084..2b291e8 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -71,9 +71,11 @@
> > #define PCIE_ATU_TYPE_IO 0x2
> > #define PCIE_ATU_TYPE_CFG0 0x4
> > #define PCIE_ATU_TYPE_CFG1 0x5
> > +#define PCIE_ATU_FUNC_NUM(pf) (pf << 20)
> > #define PCIE_ATU_CR2 0x908
> > #define PCIE_ATU_ENABLE BIT(31)
> > #define PCIE_ATU_BAR_MODE_ENABLE BIT(30)
> > +#define PCIE_ATU_FUNC_NUM_MATCH_EN BIT(19)
> > #define PCIE_ATU_LOWER_BASE 0x90C
> > #define PCIE_ATU_UPPER_BASE 0x910
> > #define PCIE_ATU_LIMIT 0x914
> > @@ -265,8 +267,12 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci);
> > void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
> > int type, u64 cpu_addr, u64 pci_addr,
> > u32 size);
> > -int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
> > - u64 cpu_addr, enum dw_pcie_as_type as_type);
> > +void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int
> index,
> > + int type, u64 cpu_addr, u64 pci_addr,
> > + u32 size);
> > +int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > + int bar, u64 cpu_addr,
> > + enum dw_pcie_as_type as_type);
> > void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
> > enum dw_pcie_region_type type);
> > void dw_pcie_setup(struct dw_pcie *pci); diff --git
> > a/include/linux/pci-epc.h b/include/linux/pci-epc.h index
> > f641bad..fc2feee 100644
> > --- a/include/linux/pci-epc.h
> > +++ b/include/linux/pci-epc.h
> > @@ -96,6 +96,7 @@ struct pci_epc {
> > const struct pci_epc_ops *ops;
> > struct pci_epc_mem *mem;
> > u8 max_functions;
> > + u32 pf_offset;
> > struct config_group *group;
> > /* spinlock to protect against concurrent access of EP controller */
> > spinlock_t lock;
> > --
> > 2.9.5
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists
> > .infradead.org%2Fmailman%2Flistinfo%2Flinux-arm-kernel&data=02%
> 7C0
> >
> 1%7Cxiaowei.bao%40nxp.com%7C0e39168f6f144db6840308d721742040%7
> C686ea1d
> >
> 3bc2b4c6fa92cd99c5c301635%7C0%7C1%7C637014654998524452&sd
> ata=bP7eh
> > cjlGXCMVFE2b4f12Q6fGV7lQ%2F5i9qIi9FoPlbI%3D&reserved=0

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