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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Mar 11, 2020 at 01:44:59PM +0100, Jean-Philippe Brucker wrote: > When initializing a PCI root bridge, copy its "ATS supported" attribute > into the root bridge. > > Acked-by: Hanjun Guo > Signed-off-by: Jean-Philippe Brucker > --- > drivers/acpi/arm64/iort.c | 27 +++++++++++++++++++++++++++ > drivers/acpi/pci_root.c | 3 +++ > include/linux/acpi_iort.h | 8 ++++++++ > 3 files changed, 38 insertions(+) > > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index ed3d2d1a7ae9..d99d7f5b51e1 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -1633,6 +1633,33 @@ static void __init iort_enable_acs(struct acpi_iort_node *iort_node) > } > } > } > + > +static acpi_status iort_match_host_bridge_callback(struct acpi_iort_node *node, > + void *context) > +{ > + struct acpi_iort_root_complex *pci_rc; > + struct pci_host_bridge *host_bridge = context; > + > + pci_rc = (struct acpi_iort_root_complex *)node->node_data; > + > + return pci_domain_nr(host_bridge->bus) == pci_rc->pci_segment_number ? > + AE_OK : AE_NOT_FOUND; > +} > + > +void iort_pci_host_bridge_setup(struct pci_host_bridge *host_bridge) > +{ > + struct acpi_iort_node *node; > + struct acpi_iort_root_complex *pci_rc; > + > + node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, > + iort_match_host_bridge_callback, host_bridge); > + if (!node) > + return; > + > + pci_rc = (struct acpi_iort_root_complex *)node->node_data; > + host_bridge->ats_supported = !!(pci_rc->ats_attribute & > + ACPI_IORT_ATS_SUPPORTED); > +} > #else > static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { } > #endif > diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c > index d1e666ef3fcc..eb2fb8f17c0b 100644 > --- a/drivers/acpi/pci_root.c > +++ b/drivers/acpi/pci_root.c > @@ -6,6 +6,7 @@ > * Copyright (C) 2001, 2002 Paul Diefenbaugh > */ > > +#include > #include > #include > #include > @@ -917,6 +918,8 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, > if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) > host_bridge->native_ltr = 0; > > + iort_pci_host_bridge_setup(host_bridge); Similar comment as on the OF side. You mentioned at [1] that "it's important that we only enable ATS if the host bridge supports it". That should be captured in a commit log and comment somewhere here. That suggests to me that we should not set bridge->ats_supported = 1; by default in pci_init_host_bridge(), but rather leave it zero as it is by default, and then do things like: if (iort_pci_host_bridge_ats_supported(bridge)) bridge->ats_supported = 1; if (of_pci_host_bridge_ats_supported(bridge)) bridge->ats_supported = 1; I don't know what you do about IVRS and DMAR, which don't appear in this series except in the comment. [1] https://lore.kernel.org/r/20200213165049.508908-1-jean-philippe@linaro.org > /* > * Evaluate the "PCI Boot Configuration" _DSM Function. If it > * exists and returns 0, we must preserve any PCI resource > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h > index 8e7e2ec37f1b..7b06871cc3aa 100644 > --- a/include/linux/acpi_iort.h > +++ b/include/linux/acpi_iort.h > @@ -10,6 +10,7 @@ > #include > #include > #include > +#include > > #define IORT_IRQ_MASK(irq) (irq & 0xffffffffULL) > #define IORT_IRQ_TRIGGER_MASK(irq) ((irq >> 32) & 0xffffffffULL) > @@ -55,4 +56,11 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) > { return 0; } > #endif > > +#if defined(CONFIG_ACPI_IORT) && defined(CONFIG_PCI) > +void iort_pci_host_bridge_setup(struct pci_host_bridge *host_bridge); > +#else > +static inline > +void iort_pci_host_bridge_setup(struct pci_host_bridge *host_bridge) { } > +#endif > + > #endif /* __ACPI_IORT_H__ */ > -- > 2.25.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel