From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Thu, 7 Jul 2016 17:51:51 +0100 Subject: [PATCH v4 3/8] of/irq: Break out msi-map lookup (again) In-Reply-To: References: Message-ID: <20160707165151.GF20682@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Jul 01, 2016 at 05:50:12PM +0100, Robin Murphy wrote: > The PCI msi-map code is already doing double-duty translating IDs and > retrieving MSI parents, which unsurprisingly is the same functionality > we need for the identically-formatted PCI iommu-map property. Drag the > core parsing routine up yet another layer into the general OF-PCI code, > and further generalise it for either kind of lookup in either flavour > of map property. > > CC: Rob Herring > CC: Frank Rowand > Acked-by: Marc Zyngier > Signed-off-by: Robin Murphy > --- > > v4: No change. > > drivers/of/irq.c | 78 ++----------------------------------- > drivers/of/of_pci.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/of_pci.h | 10 +++++ > 3 files changed, 116 insertions(+), 74 deletions(-) Whilst this looks good to me, I think we need an Ack from the DT maintainers. Rob, could you have a look please? Thanks, Will > diff --git a/drivers/of/irq.c b/drivers/of/irq.c > index 6ec743faabe8..091d45e6d61d 100644 > --- a/drivers/of/irq.c > +++ b/drivers/of/irq.c > @@ -24,6 +24,7 @@ > #include > #include > #include > +#include > #include > #include > > @@ -587,87 +588,16 @@ static u32 __of_msi_map_rid(struct device *dev, struct device_node **np, > u32 rid_in) > { > struct device *parent_dev; > - struct device_node *msi_controller_node; > - struct device_node *msi_np = *np; > - u32 map_mask, masked_rid, rid_base, msi_base, rid_len, phandle; > - int msi_map_len; > - bool matched; > u32 rid_out = rid_in; > - const __be32 *msi_map = NULL; > > /* > * Walk up the device parent links looking for one with a > * "msi-map" property. > */ > - for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) { > - if (!parent_dev->of_node) > - continue; > - > - msi_map = of_get_property(parent_dev->of_node, > - "msi-map", &msi_map_len); > - if (!msi_map) > - continue; > - > - if (msi_map_len % (4 * sizeof(__be32))) { > - dev_err(parent_dev, "Error: Bad msi-map length: %d\n", > - msi_map_len); > - return rid_out; > - } > - /* We have a good parent_dev and msi_map, let's use them. */ > - break; > - } > - if (!msi_map) > - return rid_out; > - > - /* The default is to select all bits. */ > - map_mask = 0xffffffff; > - > - /* > - * Can be overridden by "msi-map-mask" property. If > - * of_property_read_u32() fails, the default is used. > - */ > - of_property_read_u32(parent_dev->of_node, "msi-map-mask", &map_mask); > - > - masked_rid = map_mask & rid_in; > - matched = false; > - while (!matched && msi_map_len >= 4 * sizeof(__be32)) { > - rid_base = be32_to_cpup(msi_map + 0); > - phandle = be32_to_cpup(msi_map + 1); > - msi_base = be32_to_cpup(msi_map + 2); > - rid_len = be32_to_cpup(msi_map + 3); > - > - if (rid_base & ~map_mask) { > - dev_err(parent_dev, > - "Invalid msi-map translation - msi-map-mask (0x%x) ignores rid-base (0x%x)\n", > - map_mask, rid_base); > - return rid_out; > - } > - > - msi_controller_node = of_find_node_by_phandle(phandle); > - > - matched = (masked_rid >= rid_base && > - masked_rid < rid_base + rid_len); > - if (msi_np) > - matched &= msi_np == msi_controller_node; > - > - if (matched && !msi_np) { > - *np = msi_np = msi_controller_node; > + for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) > + if (!of_pci_map_rid(parent_dev->of_node, rid_in, "msi-map", > + "msi-map-mask", np, &rid_out)) > break; > - } > - > - of_node_put(msi_controller_node); > - msi_map_len -= 4 * sizeof(__be32); > - msi_map += 4; > - } > - if (!matched) > - return rid_out; > - > - rid_out = masked_rid - rid_base + msi_base; > - dev_dbg(dev, > - "msi-map at: %s, using mask %08x, rid-base: %08x, msi-base: %08x, length: %08x, rid: %08x -> %08x\n", > - dev_name(parent_dev), map_mask, rid_base, msi_base, > - rid_len, rid_in, rid_out); > - > return rid_out; > } > > diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c > index 13f4fed38048..e6465cf7aea9 100644 > --- a/drivers/of/of_pci.c > +++ b/drivers/of/of_pci.c > @@ -306,3 +306,105 @@ struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node) > EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node); > > #endif /* CONFIG_PCI_MSI */ > + > +/** > + * of_pci_map_rid - Translate a requester ID through a downstream mapping. > + * @np: root complex device node. > + * @rid: PCI requester ID to map. > + * @map_name: property name of the map to use. > + * @map_mask_name: optional property name of the mask to use. > + * @target: optional pointer to a target device node. > + * @id_out: optional pointer to receive the translated ID. > + * > + * Given a PCI requester ID, look up the appropriate implementation-defined > + * platform ID and/or the target device which receives transactions on that > + * ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or > + * @id_out may be NULL if only the other is required. If @target points to > + * a non-NULL device node pointer, only entries targeting that node will be > + * matched; if it points to a NULL value, it will receive the device node of > + * the first matching target phandle, with a reference held. > + * > + * Return: 0 on success or a standard error code on failure. > + */ > +int of_pci_map_rid(struct device_node *np, u32 rid, > + const char *map_name, const char *map_mask_name, > + struct device_node **target, u32 *id_out) > +{ > + u32 map_mask, masked_rid; > + int map_len; > + const __be32 *map = NULL; > + > + if (!np || !map_name || (!target && !id_out)) > + return -EINVAL; > + > + map = of_get_property(np, map_name, &map_len); > + if (!map) { > + if (target) > + return -ENODEV; > + /* Otherwise, no map implies no translation */ > + *id_out = rid; > + return 0; > + } > + > + if (!map_len || map_len % (4 * sizeof(*map))) { > + pr_err("%s: Error: Bad %s length: %d\n", np->full_name, > + map_name, map_len); > + return -EINVAL; > + } > + > + /* The default is to select all bits. */ > + map_mask = 0xffffffff; > + > + /* > + * Can be overridden by "{iommu,msi}-map-mask" property. > + * If of_property_read_u32() fails, the default is used. > + */ > + if (map_mask_name) > + of_property_read_u32(np, map_mask_name, &map_mask); > + > + masked_rid = map_mask & rid; > + for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) { > + struct device_node *phandle_node; > + u32 rid_base = be32_to_cpup(map + 0); > + u32 phandle = be32_to_cpup(map + 1); > + u32 out_base = be32_to_cpup(map + 2); > + u32 rid_len = be32_to_cpup(map + 3); > + > + if (rid_base & ~map_mask) { > + pr_err("%s: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n", > + np->full_name, map_name, map_name, > + map_mask, rid_base); > + return -EFAULT; > + } > + > + if (masked_rid < rid_base || masked_rid >= rid_base + rid_len) > + continue; > + > + phandle_node = of_find_node_by_phandle(phandle); > + if (!phandle_node) > + return -ENODEV; > + > + if (target) { > + if (*target) > + of_node_put(phandle_node); > + else > + *target = phandle_node; > + > + if (*target != phandle_node) > + continue; > + } > + > + if (id_out) > + *id_out = masked_rid - rid_base + out_base; > + > + pr_debug("%s: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n", > + np->full_name, map_name, map_mask, rid_base, out_base, > + rid_len, rid, *id_out); > + return 0; > + } > + > + pr_err("%s: Invalid %s translation - no match for rid 0x%x on %s\n", > + np->full_name, map_name, rid, > + target && *target ? (*target)->full_name : "any target"); > + return -EFAULT; > +} > diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h > index b969e9443962..7fd5cfce9140 100644 > --- a/include/linux/of_pci.h > +++ b/include/linux/of_pci.h > @@ -17,6 +17,9 @@ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin); > int of_pci_parse_bus_range(struct device_node *node, struct resource *res); > int of_get_pci_domain_nr(struct device_node *node); > void of_pci_check_probe_only(void); > +int of_pci_map_rid(struct device_node *np, u32 rid, > + const char *map_name, const char *map_mask_name, > + struct device_node **target, u32 *id_out); > #else > static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) > { > @@ -52,6 +55,13 @@ of_get_pci_domain_nr(struct device_node *node) > return -1; > } > > +static inline int of_pci_map_rid(struct device_node *np, u32 rid, > + const char *map_name, const char *map_mask_name, > + struct device_node **target, u32 *id_out) > +{ > + return -EINVAL; > +} > + > static inline void of_pci_check_probe_only(void) { } > #endif > > -- > 2.8.1.dirty >