PCI devices on s390 have a DMA offset that is reported via CLP. In
preparation for allowing identity domains, setup the bus_dma_region
for all PCI devices using the reported CLP value.
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
arch/s390/pci/pci_bus.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c
index d5ace00d10f0..14527687d0f2 100644
--- a/arch/s390/pci/pci_bus.c
+++ b/arch/s390/pci/pci_bus.c
@@ -19,6 +19,7 @@
#include <linux/jump_label.h>
#include <linux/pci.h>
#include <linux/printk.h>
+#include <linux/dma-direct.h>
#include <asm/pci_clp.h>
#include <asm/pci_dma.h>
@@ -284,10 +285,27 @@ static struct zpci_bus *zpci_bus_alloc(int topo, bool topo_is_tid)
return zbus;
}
+static void pci_dma_range_setup(struct pci_dev *pdev)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+ struct bus_dma_region *map;
+
+ map = kzalloc(sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return;
+
+ map->cpu_start = 0;
+ map->dma_start = PAGE_ALIGN(zdev->start_dma);
+ map->size = (u64)virt_to_phys(high_memory);
+ pdev->dev.dma_range_map = map;
+}
+
void pcibios_bus_add_device(struct pci_dev *pdev)
{
struct zpci_dev *zdev = to_zpci(pdev);
+ pci_dma_range_setup(pdev);
+
/*
* With pdev->no_vf_scan the common PCI probing code does not
* perform PF/VF linking.
--
2.47.1On Fri, 2024-12-13 at 17:49 -0500, Matthew Rosato wrote:
> PCI devices on s390 have a DMA offset that is reported via CLP. In
> preparation for allowing identity domains, setup the bus_dma_region
> for all PCI devices using the reported CLP value.
>
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
> arch/s390/pci/pci_bus.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c
> index d5ace00d10f0..14527687d0f2 100644
> --- a/arch/s390/pci/pci_bus.c
> +++ b/arch/s390/pci/pci_bus.c
> @@ -19,6 +19,7 @@
> #include <linux/jump_label.h>
> #include <linux/pci.h>
> #include <linux/printk.h>
> +#include <linux/dma-direct.h>
>
> #include <asm/pci_clp.h>
> #include <asm/pci_dma.h>
> @@ -284,10 +285,27 @@ static struct zpci_bus *zpci_bus_alloc(int topo, bool topo_is_tid)
> return zbus;
> }
>
> +static void pci_dma_range_setup(struct pci_dev *pdev)
> +{
> + struct zpci_dev *zdev = to_zpci(pdev);
> + struct bus_dma_region *map;
> +
> + map = kzalloc(sizeof(*map), GFP_KERNEL);
> + if (!map)
> + return;
> +
> + map->cpu_start = 0;
> + map->dma_start = PAGE_ALIGN(zdev->start_dma);
> + map->size = (u64)virt_to_phys(high_memory);
I don't think we should restrict the size here to the size of memory.
Instead I think it should be zdev->end_dma - zdev->start_dma.
Since we handle the restriction to memory size as reserved regions I
think that should be compatible. Also I think otherwise this might
break the admittedly odd s390_iommu_aperture=X kernel parameter on
LPARs.
> + pdev->dev.dma_range_map = map;
> +}
> +
> void pcibios_bus_add_device(struct pci_dev *pdev)
> {
> struct zpci_dev *zdev = to_zpci(pdev);
>
> + pci_dma_range_setup(pdev);
> +
> /*
> * With pdev->no_vf_scan the common PCI probing code does not
> * perform PF/VF linking.
On Mon, 2024-12-16 at 10:29 +0100, Niklas Schnelle wrote:
> On Fri, 2024-12-13 at 17:49 -0500, Matthew Rosato wrote:
> > PCI devices on s390 have a DMA offset that is reported via CLP. In
> > preparation for allowing identity domains, setup the bus_dma_region
> > for all PCI devices using the reported CLP value.
> >
> > Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> > ---
> > arch/s390/pci/pci_bus.c | 18 ++++++++++++++++++
> > 1 file changed, 18 insertions(+)
> >
> > diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c
> > index d5ace00d10f0..14527687d0f2 100644
> > --- a/arch/s390/pci/pci_bus.c
> > +++ b/arch/s390/pci/pci_bus.c
> > @@ -19,6 +19,7 @@
> > #include <linux/jump_label.h>
> > #include <linux/pci.h>
> > #include <linux/printk.h>
> > +#include <linux/dma-direct.h>
> >
> > #include <asm/pci_clp.h>
> > #include <asm/pci_dma.h>
> > @@ -284,10 +285,27 @@ static struct zpci_bus *zpci_bus_alloc(int topo, bool topo_is_tid)
> > return zbus;
> > }
> >
> > +static void pci_dma_range_setup(struct pci_dev *pdev)
> > +{
> > + struct zpci_dev *zdev = to_zpci(pdev);
> > + struct bus_dma_region *map;
> > +
> > + map = kzalloc(sizeof(*map), GFP_KERNEL);
> > + if (!map)
> > + return;
> > +
> > + map->cpu_start = 0;
> > + map->dma_start = PAGE_ALIGN(zdev->start_dma);
> > + map->size = (u64)virt_to_phys(high_memory);
>
> I don't think we should restrict the size here to the size of memory.
> Instead I think it should be zdev->end_dma - zdev->start_dma.
>
> Since we handle the restriction to memory size as reserved regions I
> think that should be compatible. Also I think otherwise this might
> break the admittedly odd s390_iommu_aperture=X kernel parameter on
> LPARs.
Correction, zdev->end_dma - zdev->start_dma + 1 because zdev->end_dma
is inclusive ;-)
>
>
> > + pdev->dev.dma_range_map = map;
> > +}
> > +
> > void pcibios_bus_add_device(struct pci_dev *pdev)
> > {
> > struct zpci_dev *zdev = to_zpci(pdev);
> >
> > + pci_dma_range_setup(pdev);
> > +
> > /*
> > * With pdev->no_vf_scan the common PCI probing code does not
> > * perform PF/VF linking.
>
>>> + map->cpu_start = 0; >>> + map->dma_start = PAGE_ALIGN(zdev->start_dma); >>> + map->size = (u64)virt_to_phys(high_memory); >> >> I don't think we should restrict the size here to the size of memory. >> Instead I think it should be zdev->end_dma - zdev->start_dma. >> >> Since we handle the restriction to memory size as reserved regions I >> think that should be compatible. Also I think otherwise this might >> break the admittedly odd s390_iommu_aperture=X kernel parameter on >> LPARs. > > Correction, zdev->end_dma - zdev->start_dma + 1 because zdev->end_dma > is inclusive ;-) > Forgot about that parameter, thanks... OK, will change to: map->size = zdev->end_dma - zdev->start_dma + 1;
© 2016 - 2026 Red Hat, Inc.