Hi Serge,
> From: Serge Semin, Sent: Saturday, July 29, 2023 11:07 AM
>
> On Fri, Jul 21, 2023 at 04:44:36PM +0900, Yoshihiro Shimoda wrote:
> > The __dw_pcie_prog_outbound_atu() currently has 6 arguments.
> > To support INTx IRQs in the future, it requires an additional 2
> > arguments. For improved code readability, introduce the struct
> > dw_pcie_ob_atu_cfg and update the arguments of
> > dw_pcie_prog_outbound_atu().
> >
> > Consequently, remove __dw_pcie_prog_outbound_atu() and
> > dw_pcie_prog_ep_outbound_atu() because there is no longer
> > a need.
> >
> > No behavior changes.
>
> So you decided not to use a suggested by me in v17 more detailed patch
> log?
You're correct. I thought your suggested comments was too detailed.
Best regards,
Yoshihiro Shimoda
> C&P it here just in case if you change your mind:
>
> This is a preparation before adding the Msg-type outbound iATU
> mapping. The respective update will require two more arguments added
> to __dw_pcie_prog_outbound_atu(). That will make the already
> complicated function prototype even more hard to comprehend accepting
> _eight_ arguments. In order to prevent that and keep the code
> more-or-less readable all the outbound iATU-related arguments are
> moved to the new config-structure: struct dw_pcie_ob_atu_cfg pointer
> to which shall be passed to dw_pcie_prog_outbound_atu(). The structure
> is supposed to be locally defined and populated with the outbound iATU
> settings implied by the caller context.
>
> As a result of the denoted change there is no longer need in having
> the two distinctive methods for the Host and End-point outbound iATU
> setups since the corresponding code can directly call the
> dw_pcie_prog_outbound_atu() method with the config-structure
> populated. Thus dw_pcie_prog_ep_outbound_atu() is dropped.
>
> -Serge(y)
>
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
> > ---
> > .../pci/controller/dwc/pcie-designware-ep.c | 21 +++++---
> > .../pci/controller/dwc/pcie-designware-host.c | 52 +++++++++++++------
> > drivers/pci/controller/dwc/pcie-designware.c | 49 ++++++-----------
> > drivers/pci/controller/dwc/pcie-designware.h | 15 ++++--
> > 4 files changed, 77 insertions(+), 60 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > index 27278010ecec..fe2e0d765be9 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > @@ -182,9 +182,8 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no, int type,
> > return 0;
> > }
> >
> > -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)
> > +static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep,
> > + struct dw_pcie_ob_atu_cfg *atu)
> > {
> > struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> > u32 free_win;
> > @@ -196,13 +195,13 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, u8 func_no,
> > return -EINVAL;
> > }
> >
> > - ret = dw_pcie_prog_ep_outbound_atu(pci, func_no, free_win, PCIE_ATU_TYPE_MEM,
> > - phys_addr, pci_addr, size);
> > + atu->index = free_win;
> > + ret = dw_pcie_prog_outbound_atu(pci, atu);
> > if (ret)
> > return ret;
> >
> > set_bit(free_win, ep->ob_window_map);
> > - ep->outbound_addr[free_win] = phys_addr;
> > + ep->outbound_addr[free_win] = atu->cpu_addr;
> >
> > return 0;
> > }
> > @@ -305,8 +304,14 @@ static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
> > int ret;
> > 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, func_no, addr, pci_addr, size);
> > + struct dw_pcie_ob_atu_cfg atu = { 0 };
> > +
> > + atu.func_no = func_no;
> > + atu.type = PCIE_ATU_TYPE_MEM;
> > + atu.cpu_addr = addr;
> > + atu.pci_addr = pci_addr;
> > + atu.size = size;
> > + ret = dw_pcie_ep_outbound_atu(ep, &atu);
> > if (ret) {
> > dev_err(pci->dev, "Failed to enable address\n");
> > return ret;
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> > index cf61733bf78d..7419185721f2 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > @@ -549,6 +549,7 @@ static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
> > {
> > struct dw_pcie_rp *pp = bus->sysdata;
> > struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > + struct dw_pcie_ob_atu_cfg atu = { 0 };
> > int type, ret;
> > u32 busdev;
> >
> > @@ -571,8 +572,12 @@ static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
> > else
> > type = PCIE_ATU_TYPE_CFG1;
> >
> > - ret = dw_pcie_prog_outbound_atu(pci, 0, type, pp->cfg0_base, busdev,
> > - pp->cfg0_size);
> > + atu.type = type;
> > + atu.cpu_addr = pp->cfg0_base;
> > + atu.pci_addr = busdev;
> > + atu.size = pp->cfg0_size;
> > +
> > + ret = dw_pcie_prog_outbound_atu(pci, &atu);
> > if (ret)
> > return NULL;
> >
> > @@ -584,6 +589,7 @@ static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
> > {
> > struct dw_pcie_rp *pp = bus->sysdata;
> > struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > + struct dw_pcie_ob_atu_cfg atu = { 0 };
> > int ret;
> >
> > ret = pci_generic_config_read(bus, devfn, where, size, val);
> > @@ -591,9 +597,12 @@ static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
> > return ret;
> >
> > if (pp->cfg0_io_shared) {
> > - ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
> > - pp->io_base, pp->io_bus_addr,
> > - pp->io_size);
> > + atu.type = PCIE_ATU_TYPE_IO;
> > + atu.cpu_addr = pp->io_base;
> > + atu.pci_addr = pp->io_bus_addr;
> > + atu.size = pp->io_size;
> > +
> > + ret = dw_pcie_prog_outbound_atu(pci, &atu);
> > if (ret)
> > return PCIBIOS_SET_FAILED;
> > }
> > @@ -606,6 +615,7 @@ static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
> > {
> > struct dw_pcie_rp *pp = bus->sysdata;
> > struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > + struct dw_pcie_ob_atu_cfg atu = { 0 };
> > int ret;
> >
> > ret = pci_generic_config_write(bus, devfn, where, size, val);
> > @@ -613,9 +623,12 @@ static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
> > return ret;
> >
> > if (pp->cfg0_io_shared) {
> > - ret = dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO,
> > - pp->io_base, pp->io_bus_addr,
> > - pp->io_size);
> > + atu.type = PCIE_ATU_TYPE_IO;
> > + atu.cpu_addr = pp->io_base;
> > + atu.pci_addr = pp->io_bus_addr;
> > + atu.size = pp->io_size;
> > +
> > + ret = dw_pcie_prog_outbound_atu(pci, &atu);
> > if (ret)
> > return PCIBIOS_SET_FAILED;
> > }
> > @@ -650,6 +663,7 @@ static struct pci_ops dw_pcie_ops = {
> > static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
> > {
> > struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > + struct dw_pcie_ob_atu_cfg atu = { 0 };
> > struct resource_entry *entry;
> > int i, ret;
> >
> > @@ -677,10 +691,13 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
> > if (pci->num_ob_windows <= ++i)
> > break;
> >
> > - ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_MEM,
> > - entry->res->start,
> > - entry->res->start - entry->offset,
> > - resource_size(entry->res));
> > + atu.index = i;
> > + atu.type = PCIE_ATU_TYPE_MEM;
> > + atu.cpu_addr = entry->res->start;
> > + atu.pci_addr = entry->res->start - entry->offset;
> > + atu.size = resource_size(entry->res);
> > +
> > + ret = dw_pcie_prog_outbound_atu(pci, &atu);
> > if (ret) {
> > dev_err(pci->dev, "Failed to set MEM range %pr\n",
> > entry->res);
> > @@ -690,10 +707,13 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
> >
> > if (pp->io_size) {
> > if (pci->num_ob_windows > ++i) {
> > - ret = dw_pcie_prog_outbound_atu(pci, i, PCIE_ATU_TYPE_IO,
> > - pp->io_base,
> > - pp->io_bus_addr,
> > - pp->io_size);
> > + atu.index = i;
> > + atu.type = PCIE_ATU_TYPE_IO;
> > + atu.cpu_addr = pp->io_base;
> > + atu.pci_addr = pp->io_bus_addr;
> > + atu.size = pp->io_size;
> > +
> > + ret = dw_pcie_prog_outbound_atu(pci, &atu);
> > if (ret) {
> > dev_err(pci->dev, "Failed to set IO range %pr\n",
> > entry->res);
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> > index 2459f2a61b9b..49b785509576 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -464,56 +464,56 @@ static inline u32 dw_pcie_enable_ecrc(u32 val)
> > return val | PCIE_ATU_TD;
> > }
> >
> > -static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
> > - int index, int type, u64 cpu_addr,
> > - u64 pci_addr, u64 size)
> > +int dw_pcie_prog_outbound_atu(struct dw_pcie *pci,
> > + const struct dw_pcie_ob_atu_cfg *atu)
> > {
> > + u64 cpu_addr = atu->cpu_addr;
> > u32 retries, val;
> > u64 limit_addr;
> >
> > if (pci->ops && pci->ops->cpu_addr_fixup)
> > cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
> >
> > - limit_addr = cpu_addr + size - 1;
> > + limit_addr = cpu_addr + atu->size - 1;
> >
> > if ((limit_addr & ~pci->region_limit) != (cpu_addr & ~pci->region_limit) ||
> > !IS_ALIGNED(cpu_addr, pci->region_align) ||
> > - !IS_ALIGNED(pci_addr, pci->region_align) || !size) {
> > + !IS_ALIGNED(atu->pci_addr, pci->region_align) || !atu->size) {
> > return -EINVAL;
> > }
> >
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_BASE,
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_LOWER_BASE,
> > lower_32_bits(cpu_addr));
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_BASE,
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_UPPER_BASE,
> > upper_32_bits(cpu_addr));
> >
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LIMIT,
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_LIMIT,
> > lower_32_bits(limit_addr));
> > if (dw_pcie_ver_is_ge(pci, 460A))
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_LIMIT,
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_UPPER_LIMIT,
> > upper_32_bits(limit_addr));
> >
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_TARGET,
> > - lower_32_bits(pci_addr));
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_TARGET,
> > - upper_32_bits(pci_addr));
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_LOWER_TARGET,
> > + lower_32_bits(atu->pci_addr));
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_UPPER_TARGET,
> > + upper_32_bits(atu->pci_addr));
> >
> > - val = type | PCIE_ATU_FUNC_NUM(func_no);
> > + val = atu->type | PCIE_ATU_FUNC_NUM(atu->func_no);
> > if (upper_32_bits(limit_addr) > upper_32_bits(cpu_addr) &&
> > dw_pcie_ver_is_ge(pci, 460A))
> > val |= PCIE_ATU_INCREASE_REGION_SIZE;
> > if (dw_pcie_ver_is(pci, 490A))
> > val = dw_pcie_enable_ecrc(val);
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL1, val);
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL1, val);
> >
> > - dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
> > + dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_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_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2);
> > + val = dw_pcie_readl_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL2);
> > if (val & PCIE_ATU_ENABLE)
> > return 0;
> >
> > @@ -525,21 +525,6 @@ static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
> > return -ETIMEDOUT;
> > }
> >
> > -int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
> > - u64 cpu_addr, u64 pci_addr, u64 size)
> > -{
> > - return __dw_pcie_prog_outbound_atu(pci, 0, index, type,
> > - cpu_addr, pci_addr, size);
> > -}
> > -
> > -int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > - int type, u64 cpu_addr, u64 pci_addr,
> > - u64 size)
> > -{
> > - return __dw_pcie_prog_outbound_atu(pci, func_no, index, type,
> > - cpu_addr, pci_addr, size);
> > -}
> > -
> > static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg)
> > {
> > return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg);
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> > index 3c06e025c905..85de0d8346fa 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -288,6 +288,15 @@ enum dw_pcie_core_rst {
> > DW_PCIE_NUM_CORE_RSTS
> > };
> >
> > +struct dw_pcie_ob_atu_cfg {
> > + int index;
> > + int type;
> > + u8 func_no;
> > + u64 cpu_addr;
> > + u64 pci_addr;
> > + u64 size;
> > +};
> > +
> > struct dw_pcie_host_ops {
> > int (*host_init)(struct dw_pcie_rp *pp);
> > void (*host_deinit)(struct dw_pcie_rp *pp);
> > @@ -416,10 +425,8 @@ void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
> > int dw_pcie_link_up(struct dw_pcie *pci);
> > void dw_pcie_upconfig_setup(struct dw_pcie *pci);
> > int dw_pcie_wait_for_link(struct dw_pcie *pci);
> > -int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
> > - u64 cpu_addr, u64 pci_addr, u64 size);
> > -int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > - int type, u64 cpu_addr, u64 pci_addr, u64 size);
> > +int dw_pcie_prog_outbound_atu(struct dw_pcie *pci,
> > + const struct dw_pcie_ob_atu_cfg *atu);
> > int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,
> > u64 cpu_addr, u64 pci_addr, u64 size);
> > int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > --
> > 2.25.1
> >
