| Message ID | 20240429113938.192706-4-jean-philippe@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Enable PCIe ATS for devicetree boot | expand |
On Mon, Apr 29, 2024 at 12:39:38PM +0100, Jean-Philippe Brucker wrote: > Device-tree declares whether a PCI root-complex supports ATS by setting > the "ats-supported" property. Copy this flag into device fwspec to let > IOMMU drivers quickly check if they can enable ATS for a device. > > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > Tested-by: Ketan Patil <ketanp@nvidia.com> > --- > drivers/iommu/of_iommu.c | 9 +++++++++ > 1 file changed, 9 insertions(+) Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Jason
On Mon, Apr 29, 2024 at 12:39:38PM +0100, Jean-Philippe Brucker wrote: > Device-tree declares whether a PCI root-complex supports ATS by setting > the "ats-supported" property. Copy this flag into device fwspec to let > IOMMU drivers quickly check if they can enable ATS for a device. > > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > Tested-by: Ketan Patil <ketanp@nvidia.com> Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> > --- > drivers/iommu/of_iommu.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c > index 3afe0b48a48db..082b94c2b3291 100644 > --- a/drivers/iommu/of_iommu.c > +++ b/drivers/iommu/of_iommu.c > @@ -105,6 +105,14 @@ static int of_iommu_configure_device(struct device_node *master_np, > of_iommu_configure_dev(master_np, dev); > } > > +static void of_pci_check_device_ats(struct device *dev, struct device_node *np) > +{ > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > + > + if (fwspec && of_property_read_bool(np, "ats-supported")) > + fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS; > +} > + > /* > * Returns: > * 0 on success, an iommu was configured > @@ -147,6 +155,7 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np, > pci_request_acs(); > err = pci_for_each_dma_alias(to_pci_dev(dev), > of_pci_iommu_init, &info); > + of_pci_check_device_ats(dev, master_np); > } else { > err = of_iommu_configure_device(master_np, dev, id); > } > -- > 2.44.0 >
On 29/04/2024 12:39 pm, Jean-Philippe Brucker wrote: > Device-tree declares whether a PCI root-complex supports ATS by setting > the "ats-supported" property. Copy this flag into device fwspec to let > IOMMU drivers quickly check if they can enable ATS for a device. I don't think this functionally conflicts with what I've got going on in this area at the moment, and although the way it fits around the other error handling seems a bit obtuse and clunky IMO, apparently that's the fault of the existing ACPI implementation, so for now, Reviewed-by: Robin Murphy <robin.murphy@arm.com> > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > Tested-by: Ketan Patil <ketanp@nvidia.com> > --- > drivers/iommu/of_iommu.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c > index 3afe0b48a48db..082b94c2b3291 100644 > --- a/drivers/iommu/of_iommu.c > +++ b/drivers/iommu/of_iommu.c > @@ -105,6 +105,14 @@ static int of_iommu_configure_device(struct device_node *master_np, > of_iommu_configure_dev(master_np, dev); > } > > +static void of_pci_check_device_ats(struct device *dev, struct device_node *np) > +{ > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > + > + if (fwspec && of_property_read_bool(np, "ats-supported")) > + fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS; > +} > + > /* > * Returns: > * 0 on success, an iommu was configured > @@ -147,6 +155,7 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np, > pci_request_acs(); > err = pci_for_each_dma_alias(to_pci_dev(dev), > of_pci_iommu_init, &info); > + of_pci_check_device_ats(dev, master_np); > } else { > err = of_iommu_configure_device(master_np, dev, id); > }
On Mon, Apr 29, 2024 at 12:39:38PM +0100, Jean-Philippe Brucker wrote: > Device-tree declares whether a PCI root-complex supports ATS by setting > the "ats-supported" property. Copy this flag into device fwspec to let > IOMMU drivers quickly check if they can enable ATS for a device. > > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > Tested-by: Ketan Patil <ketanp@nvidia.com> Thank you for sending this! Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index 3afe0b48a48db..082b94c2b3291 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -105,6 +105,14 @@ static int of_iommu_configure_device(struct device_node *master_np, of_iommu_configure_dev(master_np, dev); } +static void of_pci_check_device_ats(struct device *dev, struct device_node *np) +{ + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + + if (fwspec && of_property_read_bool(np, "ats-supported")) + fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS; +} + /* * Returns: * 0 on success, an iommu was configured @@ -147,6 +155,7 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np, pci_request_acs(); err = pci_for_each_dma_alias(to_pci_dev(dev), of_pci_iommu_init, &info); + of_pci_check_device_ats(dev, master_np); } else { err = of_iommu_configure_device(master_np, dev, id); }