Re: [PATCH RESEND v4 15/15] PCI: dwc: Introduce dma-ranges property support for RC-host

Serge Semin
2022-08-09T20:07:52Z

On Mon, Aug 01, 2022 at 07:30:47PM +0530, Manivannan Sadhasivam wrote:
> On Fri, Jun 24, 2022 at 05:39:47PM +0300, Serge Semin wrote:
> > In accordance with the generic PCIe Root Port DT-bindings the "dma-ranges"
> > property has the same format as the "ranges" property. The only difference
> > is in their semantics. The "dma-ranges" property describes the PCIe-to-CPU
> > memory mapping in opposite to the CPU-to-PCIe mapping of the "ranges"
> > property. Even though the DW PCIe controllers are normally equipped with
> > the internal Address Translation Unit which inbound and outbound tables
> > can be used to implement both properties semantics, it was surprising for
> > me to discover that the host-related part of the DW PCIe driver currently
> > supports the "ranges" property only while the "dma-ranges" windows are
> > just ignored. Having the "dma-ranges" supported in the driver would be
> > very handy for the platforms, that don't tolerate the 1:1 CPU-PCIe memory
> > mapping and require a customized PCIe memory layout. So let's fix that by
> > introducing the "dma-ranges" property support.
> >
> > First of all we suggest to rename the dw_pcie_prog_inbound_atu() method to
> > dw_pcie_prog_ep_inbound_atu() and create a new version of the
> > dw_pcie_prog_inbound_atu() function. Thus we'll have two methods for the
> > RC and EP controllers respectively in the same way as it has been
> > developed for the outbound ATU setup methods.
> >
> > Secondly aside with the memory window index and type the new
> > dw_pcie_prog_inbound_atu() function will accept CPU address, PCIe address
> > and size as its arguments. These parameters define the PCIe and CPU memory
> > ranges which will be used to setup the respective inbound ATU mapping. The
> > passed parameters need to be verified against the ATU ranges constraints
> > in the same way as it is done for the outbound ranges.
> >
> > Finally the DMA-ranges detected for the PCIe controller need to be
> > converted to the inbound ATU entries during the host controller
> > initialization procedure. It will be done in the framework of the
> > dw_pcie_iatu_setup() method. Note before setting the inbound ranges up we
> > need to disable all the inbound ATU entries in order to prevent unexpected
> > PCIe TLPs translations defined by some third party software like
> > bootloaders.
> >
> > Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
>
> Small nitpick below,
>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
>
> Thanks,
> Mani
>
> > Reviewed-by: Rob Herring <robh@kernel.org>
> >
> > ---
> >
> > Changelog v3:
> > - Drop inbound iATU window size alignment constraint. (@Manivannan)
> > ---
> > .../pci/controller/dwc/pcie-designware-ep.c | 4 +-
> > .../pci/controller/dwc/pcie-designware-host.c | 32 ++++++++++-
> > drivers/pci/controller/dwc/pcie-designware.c | 56 ++++++++++++++++++-
> > drivers/pci/controller/dwc/pcie-designware.h | 6 +-
> > 4 files changed, 89 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > index 627c4b69878c..441feff1917a 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > @@ -167,8 +167,8 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no, int type,
> > return -EINVAL;
> > }
> >
> > - ret = dw_pcie_prog_inbound_atu(pci, func_no, free_win, type,
> > - cpu_addr, bar);
> > + ret = dw_pcie_prog_ep_inbound_atu(pci, func_no, free_win, type,
> > + cpu_addr, bar);
> > if (ret < 0) {
> > dev_err(pci->dev, "Failed to program IB window\n");
> > return ret;
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> > index 6993ce9e856d..2fbe9dc11634 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > @@ -581,12 +581,15 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
> > }
> >
> > /*
> > - * Ensure all outbound windows are disabled before proceeding with
> > - * the MEM/IO ranges setups.
> > + * Ensure all out/inbound windows are disabled before proceeding with
> > + * the MEM/IO (dma-)ranges setups.
> > */
> > for (i = 0; i < pci->num_ob_windows; i++)
> > dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, i);
> >
> > + for (i = 0; i < pci->num_ib_windows; i++)
> > + dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, i);
> > +
> > i = 0;
> > resource_list_for_each_entry(entry, &pp->bridge->windows) {
> > if (resource_type(entry->res) != IORESOURCE_MEM)
> > @@ -623,9 +626,32 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
> > }
> >
> > if (pci->num_ob_windows <= i)
> > - dev_warn(pci->dev, "Resources exceed number of ATU entries (%d)\n",
> > + dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n",
> > pci->num_ob_windows);
> >
>

> I think a comment here explaining what's going on below would be helpful in the
> future.

Both ranges and dma-ranges are initialized in the same way. Moreover
the method is pretty much coherent with self-explained name. So adding
an additional comment here doesn't seem much required.

>
> > + i = 0;
> > + resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) {
> > + if (resource_type(entry->res) != IORESOURCE_MEM)
> > + continue;
> > +
> > + if (pci->num_ib_windows <= i)
> > + break;
> > +
> > + ret = dw_pcie_prog_inbound_atu(pci, i++, PCIE_ATU_TYPE_MEM,
> > + entry->res->start,
> > + entry->res->start - entry->offset,
> > + resource_size(entry->res));
> > + if (ret) {
> > + dev_err(pci->dev, "Failed to set DMA range %pr\n",
> > + entry->res);
> > + return ret;
> > + }
> > + }
> > +
> > + if (pci->num_ib_windows <= i)
> > + dev_warn(pci->dev, "Dma-ranges exceed inbound iATU size (%u)\n",
>

> "dma-ranges"

I was referring to the similar message printed in case of the number
of specified ranges goes out of bounds.

-Sergey

>
> > + pci->num_ib_windows);
> > +
> > return 0;
> > }
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> > index 9c622b635fdd..7a5be3c4f8e0 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -396,8 +396,60 @@ static inline void dw_pcie_writel_atu_ib(struct dw_pcie *pci, u32 index, u32 reg
> > dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg, val);
> > }
> >
> > -int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > - int type, u64 cpu_addr, u8 bar)
> > +int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,
> > + u64 cpu_addr, u64 pci_addr, u64 size)
> > +{
> > + u64 limit_addr = pci_addr + size - 1;
> > + u32 retries, val;
> > +
> > + if ((limit_addr & ~pci->region_limit) != (pci_addr & ~pci->region_limit) ||
> > + !IS_ALIGNED(cpu_addr, pci->region_align) ||
> > + !IS_ALIGNED(pci_addr, pci->region_align) || !size) {
> > + return -EINVAL;
> > + }
> > +
> > + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_BASE,
> > + lower_32_bits(pci_addr));
> > + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_BASE,
> > + upper_32_bits(pci_addr));
> > +
> > + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LIMIT,
> > + lower_32_bits(limit_addr));
> > + if (dw_pcie_ver_is_ge(pci, 460A))
> > + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_LIMIT,
> > + upper_32_bits(limit_addr));
> > +
> > + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET,
> > + lower_32_bits(cpu_addr));
> > + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET,
> > + upper_32_bits(cpu_addr));
> > +
> > + val = type;
> > + if (upper_32_bits(limit_addr) > upper_32_bits(pci_addr) &&
> > + dw_pcie_ver_is_ge(pci, 460A))
> > + val |= PCIE_ATU_INCREASE_REGION_SIZE;
> > + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, val);
> > + dw_pcie_writel_atu_ib(pci, 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_ib(pci, index, PCIE_ATU_REGION_CTRL2);
> > + if (val & PCIE_ATU_ENABLE)
> > + return 0;
> > +
> > + mdelay(LINK_WAIT_IATU);
> > + }
> > +
> > + dev_err(pci->dev, "Inbound iATU is not being enabled\n");
> > +
> > + return -ETIMEDOUT;
> > +}
> > +
> > +int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > + int type, u64 cpu_addr, u8 bar)
> > {
> > u32 retries, val;
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> > index c3e73ed9aff5..5954e8cf9eec 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -308,8 +308,10 @@ 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_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
> > - int type, u64 cpu_addr, u8 bar);
> > +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,
> > + int type, u64 cpu_addr, u8 bar);
> > void dw_pcie_disable_atu(struct dw_pcie *pci, u32 dir, int index);
> > void dw_pcie_setup(struct dw_pcie *pci);
> > void dw_pcie_iatu_detect(struct dw_pcie *pci);
> > --
> > 2.35.1
> >
>
> --
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