Re: [PATCH v8 1/3] PCI: microchip: Fix outbound address translation tables

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

On Wed, 21 Aug 2024, Bjorn Helgaas wrote:

> On Wed, Aug 21, 2024 at 02:02:15PM +0100, daire.mcnamara@microchip.com wrote:
> > From: Daire McNamara <daire.mcnamara@microchip.com>
> > 
> > On Microchip PolarFire SoC (MPFS) the PCIe Root Port can be behind one of
> > three general-purpose Fabric Interface Controller (FIC) buses that
> > encapsulate an AXI-M interface. That FIC is responsible for managing
> > the translations of the upper 32-bits of the AXI-M address. On MPFS,
> > the Root Port driver needs to take account of that outbound address
> > translation done by the parent FIC bus before setting up its own
> > outbound address translation tables.  In all cases on MPFS,
> > the remaining outbound address translation tables are 32-bit only.
> > 
> > Limit the outbound address translation tables to 32-bit only.
> > 
> > This necessitates changing a size_t in mc_pcie_setup_window
> > to a u64 to avoid a compile error on 32-bit platforms.
> 
> I don't see this size_t change in this patch.  Add "()" after function
> name if there's a relevant function here.

It looks that change was still present in v7 but also "u64" is not correct 
either because it was changed to resource_size_t.

> > Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip Polarfire PCIe controller driver")
> > Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
> > Acked-by: Conor Dooley <conor.dooley@microchip.com>
> > Reviewed-by: Ilpo Jarvinen <ilpo.jarvinen@linux.intel.com>
> > ---
> >  .../pci/controller/plda/pcie-microchip-host.c | 30 ++++++++++++++++---
> >  1 file changed, 26 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
> > index 48f60a04b740..da766de347bd 100644
> > --- a/drivers/pci/controller/plda/pcie-microchip-host.c
> > +++ b/drivers/pci/controller/plda/pcie-microchip-host.c
> > @@ -21,6 +21,8 @@
> >  #include "../../pci.h"
> >  #include "pcie-plda.h"
> >  
> > +#define MC_OUTBOUND_TRANS_TBL_MASK		GENMASK(31, 0)
> > +
> >  /* PCIe Bridge Phy and Controller Phy offsets */
> >  #define MC_PCIE1_BRIDGE_ADDR			0x00008000u
> >  #define MC_PCIE1_CTRL_ADDR			0x0000a000u
> > @@ -612,6 +614,27 @@ static void mc_disable_interrupts(struct mc_pcie *port)
> >  	writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_HOST);
> >  }
> >  
> > +int mc_pcie_setup_iomems(struct pci_host_bridge *bridge,
> > +			   struct plda_pcie_rp *port)
> > +{
> > +	void __iomem *bridge_base_addr = port->bridge_addr;
> > +	struct resource_entry *entry;
> > +	u64 pci_addr;
> > +	u32 index = 1;
> > +
> > +	resource_list_for_each_entry(entry, &bridge->windows) {
> > +		if (resource_type(entry->res) == IORESOURCE_MEM) {
> > +			pci_addr = entry->res->start - entry->offset;
> > +			plda_pcie_setup_window(bridge_base_addr, index,
> > +					       entry->res->start & MC_OUTBOUND_TRANS_TBL_MASK,
> > +					       pci_addr, resource_size(entry->res));
> > +			index++;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >  static int mc_platform_init(struct pci_config_window *cfg)
> >  {
> >  	struct device *dev = cfg->parent;
> > @@ -622,15 +645,14 @@ static int mc_platform_init(struct pci_config_window *cfg)
> >  	int ret;
> >  
> >  	/* Configure address translation table 0 for PCIe config space */
> > -	plda_pcie_setup_window(bridge_base_addr, 0, cfg->res.start,
> > -			       cfg->res.start,
> > -			       resource_size(&cfg->res));
> > +	plda_pcie_setup_window(bridge_base_addr, 0, cfg->res.start & MC_OUTBOUND_TRANS_TBL_MASK,
> > +			       0, resource_size(&cfg->res));
> >  
> >  	/* Need some fixups in config space */
> >  	mc_pcie_enable_msi(port, cfg->win);
> >  
> >  	/* Configure non-config space outbound ranges */
> > -	ret = plda_pcie_setup_iomems(bridge, &port->plda);
> > +	ret = mc_pcie_setup_iomems(bridge, &port->plda);
> >  	if (ret)
> >  		return ret;
> >  
> > -- 
> > 2.34.1
> > 
> 

-- 
 i.