On Mon, 2020-10-12 at 11:33 +0200, Thomas Gleixner wrote: > On Sun, Oct 11 2020 at 22:15, David Woodhouse wrote: > > On 11 October 2020 18:12:08 BST, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > > On Sat, Oct 10 2020 at 12:58, David Woodhouse wrote: > > > > On 10 October 2020 12:44:10 BST, Thomas Gleixner <tglx@xxxxxxxxxxxxx> > > > > > > wrote: > > > > Yeah. There's some muttering to be done for HPET about whether it's > > > > *its* MSI domain or whether it's the parent domain. But I'll have a > > > > play. I think we'll be able to drop the whole > > > > irq_remapping_get_irq_domain() thing. > > > > > > That would be really nice. > > > > I can make it work for HPET if I fix up the point at which the IRQ > > remapping code registers a notifier on the platform bus. (At IRQ remap > > setup time is too early; when it registers the PCI bus notifier is too > > late.) > > > > IOAPIC is harder though as the platform bus doesn't even exist that > > early. Maybe an early platform bus is possible but it would have to > > turn out particularly simple to do, or I'd need to find another use > > case too, to justify it. Will continue to play.... > > You might want to look into using irq_find_matching_fwspec() instead for > both HPET and IOAPIC. That needs a select() callback implemented in the > remapping domains. That works. Pushed (along with that trivial HPET MSI fixup) to https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/ext_dest_id Briefly tested with I/OAPIC with and without Intel remapping in qemu, not tested for HPET because I haven't worked out how to get qemu to do HPET-MSI yet. David Woodhouse (8): genirq/irqdomain: Implement get_name() method on irqchip fwnodes x86/apic: Add select() method on vector irqdomain iommu/amd: Implement select() method on remapping irqdomain iommu/vt-d: Implement select() method on remapping irqdomain iommu/hyper-v: Implement select() method on remapping irqdomain x86/hpet: Use irq_find_matching_fwspec() to find remapping irqdomain x86/ioapic: Use irq_find_matching_fwspec() to find remapping irqdomain x86: Kill all traces of irq_remapping_get_irq_domain() arch/x86/include/asm/hw_irq.h | 2 -- arch/x86/include/asm/irq_remapping.h | 9 ------ arch/x86/include/asm/irqdomain.h | 3 ++ arch/x86/kernel/apic/io_apic.c | 21 ++++++-------- arch/x86/kernel/apic/vector.c | 52 +++++++++++++++++++++++++++++++++++ arch/x86/kernel/hpet.c | 23 +++++++++------- drivers/iommu/amd/iommu.c | 53 +++++++++++++----------------------- drivers/iommu/hyperv-iommu.c | 18 ++++++------ drivers/iommu/intel/irq_remapping.c | 30 +++++++++----------- drivers/iommu/irq_remapping.c | 14 ---------- drivers/iommu/irq_remapping.h | 3 -- kernel/irq/irqdomain.c | 11 +++++++- 12 files changed, 128 insertions(+), 111 deletions(-) diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h index aabd8f1b6bb0..aef795f17478 100644 --- a/arch/x86/include/asm/hw_irq.h +++ b/arch/x86/include/asm/hw_irq.h @@ -40,8 +40,6 @@ enum irq_alloc_type { X86_IRQ_ALLOC_TYPE_PCI_MSIX, X86_IRQ_ALLOC_TYPE_DMAR, X86_IRQ_ALLOC_TYPE_UV, - X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT, - X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT, }; struct ioapic_alloc_info { diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h index af4a151d70b3..7cc49432187f 100644 --- a/arch/x86/include/asm/irq_remapping.h +++ b/arch/x86/include/asm/irq_remapping.h @@ -44,9 +44,6 @@ extern int irq_remapping_reenable(int); extern int irq_remap_enable_fault_handling(void); extern void panic_if_irq_remap(const char *msg); -extern struct irq_domain * -irq_remapping_get_irq_domain(struct irq_alloc_info *info); - /* Create PCI MSI/MSIx irqdomain, use @parent as the parent irqdomain. */ extern struct irq_domain * arch_create_remap_msi_irq_domain(struct irq_domain *par, const char *n, int id); @@ -71,11 +68,5 @@ static inline void panic_if_irq_remap(const char *msg) { } -static inline struct irq_domain * -irq_remapping_get_irq_domain(struct irq_alloc_info *info) -{ - return NULL; -} - #endif /* CONFIG_IRQ_REMAP */ #endif /* __X86_IRQ_REMAPPING_H */ diff --git a/arch/x86/include/asm/irqdomain.h b/arch/x86/include/asm/irqdomain.h index cd684d45cb5f..2fc85f523ace 100644 --- a/arch/x86/include/asm/irqdomain.h +++ b/arch/x86/include/asm/irqdomain.h @@ -12,6 +12,9 @@ enum { X86_IRQ_ALLOC_LEGACY = 0x2, }; +int x86_fwspec_is_ioapic(struct irq_fwspec *fwspec); +int x86_fwspec_is_hpet(struct irq_fwspec *fwspec); + extern struct irq_domain *x86_vector_domain; extern void init_irq_alloc_info(struct irq_alloc_info *info, diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index ca2da19d5c55..f6a5b9f887aa 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2305,36 +2305,33 @@ static inline void __init check_timer(void) static int mp_irqdomain_create(int ioapic) { - struct irq_alloc_info info; struct irq_domain *parent; int hwirqs = mp_ioapic_pin_count(ioapic); struct ioapic *ip = &ioapics[ioapic]; struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg; struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic); struct fwnode_handle *fn; - char *name = "IO-APIC"; + struct irq_fwspec fwspec; if (cfg->type == IOAPIC_DOMAIN_INVALID) return 0; - init_irq_alloc_info(&info, NULL); - info.type = X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT; - info.devid = mpc_ioapic_id(ioapic); - parent = irq_remapping_get_irq_domain(&info); - if (!parent) - parent = x86_vector_domain; - else - name = "IO-APIC-IR"; - /* Handle device tree enumerated APICs proper */ if (cfg->dev) { fn = of_node_to_fwnode(cfg->dev); } else { - fn = irq_domain_alloc_named_id_fwnode(name, ioapic); + fn = irq_domain_alloc_named_id_fwnode("IO-APIC", ioapic); if (!fn) return -ENOMEM; } + fwspec.fwnode = fn; + fwspec.param_count = 1; + fwspec.param[0] = ioapic; + parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_ANY); + if (!parent) + return -ENODEV; + ip->irqdomain = irq_domain_create_linear(fn, hwirqs, cfg->ops, (void *)(long)ioapic); diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index bb2e2a2488a5..3f0485c12b13 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -636,7 +636,59 @@ static void x86_vector_debug_show(struct seq_file *m, struct irq_domain *d, } #endif + +int x86_fwspec_is_ioapic(struct irq_fwspec *fwspec) +{ + if (fwspec->param_count != 1) + return 0; + + if (is_fwnode_irqchip(fwspec->fwnode)){ + const char *fwname = fwnode_get_name(fwspec->fwnode); + + if (!strncmp(fwname, "IO-APIC-", 8) && + simple_strtol(fwname+8, NULL, 10) == fwspec->param[0]) + return 1; +#ifdef CONFIG_OF + } else if (to_of_node(fwspec->fwnode) && + of_device_is_compatible(to_of_node(fwspec->fwnode), + "intel,ce4100-ioapic")) { + return 1; +#endif + } + return 0; +} + +int x86_fwspec_is_hpet(struct irq_fwspec *fwspec) +{ + if (fwspec->param_count != 1) + return 0; + + if (is_fwnode_irqchip(fwspec->fwnode)){ + const char *fwname = fwnode_get_name(fwspec->fwnode); + + if (!strncmp(fwname, "HPET-MSI-", 9) && + simple_strtol(fwname+9, NULL, 10) == fwspec->param[0]) + return 1; + } + return 0; +} + +static int x86_vector_select(struct irq_domain *d, struct irq_fwspec *fwspec, + enum irq_domain_bus_token bus_token) +{ + /* + * HPET and I/OAPIC cannot be parented in the vector domain + * if IRQ remapping is enabled. APIC IDs above 15 bits are + * only permitted if IRQ remapping is enabled, so check that. + */ + if (apic->apic_id_valid(32768)) + return 0; + + return x86_fwspec_is_ioapic(fwspec) || x86_fwspec_is_hpet(fwspec); +} + static const struct irq_domain_ops x86_vector_domain_ops = { + .select = x86_vector_select, .alloc = x86_vector_alloc_irqs, .free = x86_vector_free_irqs, .activate = x86_vector_activate, diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index 3b8b12769f3b..fb7736ca7b5b 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -543,8 +543,8 @@ static struct irq_domain *hpet_create_irq_domain(int hpet_id) { struct msi_domain_info *domain_info; struct irq_domain *parent, *d; - struct irq_alloc_info info; struct fwnode_handle *fn; + struct irq_fwspec fwspec; if (x86_vector_domain == NULL) return NULL; @@ -556,15 +556,6 @@ static struct irq_domain *hpet_create_irq_domain(int hpet_id) *domain_info = hpet_msi_domain_info; domain_info->data = (void *)(long)hpet_id; - init_irq_alloc_info(&info, NULL); - info.type = X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT; - info.devid = hpet_id; - parent = irq_remapping_get_irq_domain(&info); - if (parent == NULL) - parent = x86_vector_domain; - else - hpet_msi_controller.name = "IR-HPET-MSI"; - fn = irq_domain_alloc_named_id_fwnode(hpet_msi_controller.name, hpet_id); if (!fn) { @@ -572,6 +563,18 @@ static struct irq_domain *hpet_create_irq_domain(int hpet_id) return NULL; } + fwspec.fwnode = fn; + fwspec.param_count = 1; + fwspec.param[0] = hpet_id; + parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_ANY); + if (!parent) { + irq_domain_free_fwnode(fn); + kfree(domain_info); + return NULL; + } + if (parent != x86_vector_domain) + hpet_msi_controller.name = "IR-HPET-MSI"; + d = msi_create_irq_domain(fn, domain_info, parent); if (!d) { irq_domain_free_fwnode(fn); diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 13d0a8f42d56..16adbf9d8fbb 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -3536,10 +3536,8 @@ static int get_devid(struct irq_alloc_info *info) { switch (info->type) { case X86_IRQ_ALLOC_TYPE_IOAPIC: - case X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT: return get_ioapic_devid(info->devid); case X86_IRQ_ALLOC_TYPE_HPET: - case X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT: return get_hpet_devid(info->devid); case X86_IRQ_ALLOC_TYPE_PCI_MSI: case X86_IRQ_ALLOC_TYPE_PCI_MSIX: @@ -3550,46 +3548,32 @@ static int get_devid(struct irq_alloc_info *info) } } -static struct irq_domain *get_irq_domain_for_devid(struct irq_alloc_info *info, - int devid) -{ - struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; - - if (!iommu) - return NULL; - - switch (info->type) { - case X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT: - case X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT: - return iommu->ir_domain; - default: - WARN_ON_ONCE(1); - return NULL; - } -} - -static struct irq_domain *get_irq_domain(struct irq_alloc_info *info) -{ - int devid; - - if (!info) - return NULL; - - devid = get_devid(info); - if (devid < 0) - return NULL; - return get_irq_domain_for_devid(info, devid); -} - struct irq_remap_ops amd_iommu_irq_ops = { .prepare = amd_iommu_prepare, .enable = amd_iommu_enable, .disable = amd_iommu_disable, .reenable = amd_iommu_reenable, .enable_faulting = amd_iommu_enable_faulting, - .get_irq_domain = get_irq_domain, }; +static int irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec, + enum irq_domain_bus_token bus_token) +{ + struct amd_iommu *iommu; + int devid = -1; + + if (x86_fwspec_is_ioapic(fwspec)) + devid = get_ioapic_devid(fwspec->param[0]); + else if (x86_fwspec_is_ioapic(fwspec)) + devid = get_hpet_devid(fwspec->param[0]); + + if (devid < 0) + return 0; + + iommu = amd_iommu_rlookup_table[devid]; + return iommu && iommu->ir_domain == d; +} + static void irq_remapping_prepare_irte(struct amd_ir_data *data, struct irq_cfg *irq_cfg, struct irq_alloc_info *info, @@ -3813,6 +3797,7 @@ static void irq_remapping_deactivate(struct irq_domain *domain, } static const struct irq_domain_ops amd_ir_domain_ops = { + .select = irq_remapping_select, .alloc = irq_remapping_alloc, .free = irq_remapping_free, .activate = irq_remapping_activate, diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c index 37dd485a5640..e7ed2bb83358 100644 --- a/drivers/iommu/hyperv-iommu.c +++ b/drivers/iommu/hyperv-iommu.c @@ -61,6 +61,14 @@ static struct irq_chip hyperv_ir_chip = { .irq_set_affinity = hyperv_ir_set_affinity, }; +static int hyperv_irq_remapping_select(struct irq_domain *d, + struct irq_fwspec *fwspec, + enum irq_domain_bus_token bus_token) +{ + /* Claim only the first (and only) I/OAPIC */ + return x86_fwspec_is_ioapic(fwspec) && fwspec->param[0] == 0; +} + static int hyperv_irq_remapping_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *arg) @@ -102,6 +110,7 @@ static void hyperv_irq_remapping_free(struct irq_domain *domain, } static const struct irq_domain_ops hyperv_ir_domain_ops = { + .select = hyperv_irq_remapping_select, .alloc = hyperv_irq_remapping_alloc, .free = hyperv_irq_remapping_free, }; @@ -151,18 +160,9 @@ static int __init hyperv_enable_irq_remapping(void) return IRQ_REMAP_X2APIC_MODE; } -static struct irq_domain *hyperv_get_irq_domain(struct irq_alloc_info *info) -{ - if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT) - return ioapic_ir_domain; - else - return NULL; -} - struct irq_remap_ops hyperv_irq_remap_ops = { .prepare = hyperv_prepare_irq_remapping, .enable = hyperv_enable_irq_remapping, - .get_irq_domain = hyperv_get_irq_domain, }; #endif diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c index 511dfb4884bc..ccf61cd18f69 100644 --- a/drivers/iommu/intel/irq_remapping.c +++ b/drivers/iommu/intel/irq_remapping.c @@ -1128,29 +1128,12 @@ static void prepare_irte(struct irte *irte, int vector, unsigned int dest) irte->redir_hint = 1; } -static struct irq_domain *intel_get_irq_domain(struct irq_alloc_info *info) -{ - if (!info) - return NULL; - - switch (info->type) { - case X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT: - return map_ioapic_to_ir(info->devid); - case X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT: - return map_hpet_to_ir(info->devid); - default: - WARN_ON_ONCE(1); - return NULL; - } -} - struct irq_remap_ops intel_irq_remap_ops = { .prepare = intel_prepare_irq_remapping, .enable = intel_enable_irq_remapping, .disable = disable_irq_remapping, .reenable = reenable_irq_remapping, .enable_faulting = enable_drhd_fault_handling, - .get_irq_domain = intel_get_irq_domain, }; static void intel_ir_reconfigure_irte(struct irq_data *irqd, bool force) @@ -1435,7 +1418,20 @@ static void intel_irq_remapping_deactivate(struct irq_domain *domain, modify_irte(&data->irq_2_iommu, &entry); } +static int intel_irq_remapping_select(struct irq_domain *d, + struct irq_fwspec *fwspec, + enum irq_domain_bus_token bus_token) +{ + if (x86_fwspec_is_ioapic(fwspec)) + return d == map_ioapic_to_ir(fwspec->param[0]); + else if (x86_fwspec_is_hpet(fwspec)) + return d == map_hpet_to_ir(fwspec->param[0]); + + return 0; +} + static const struct irq_domain_ops intel_ir_domain_ops = { + .select = intel_irq_remapping_select, .alloc = intel_irq_remapping_alloc, .free = intel_irq_remapping_free, .activate = intel_irq_remapping_activate, diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c index 2d84b1ed205e..83314b9d8f38 100644 --- a/drivers/iommu/irq_remapping.c +++ b/drivers/iommu/irq_remapping.c @@ -158,17 +158,3 @@ void panic_if_irq_remap(const char *msg) if (irq_remapping_enabled) panic(msg); } - -/** - * irq_remapping_get_irq_domain - Get the irqdomain serving the request @info - * @info: interrupt allocation information, used to identify the IOMMU device - * - * Returns pointer to IRQ domain, or NULL on failure. - */ -struct irq_domain *irq_remapping_get_irq_domain(struct irq_alloc_info *info) -{ - if (!remap_ops || !remap_ops->get_irq_domain) - return NULL; - - return remap_ops->get_irq_domain(info); -} diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h index 1661b3d75920..8c89cb947cdb 100644 --- a/drivers/iommu/irq_remapping.h +++ b/drivers/iommu/irq_remapping.h @@ -42,9 +42,6 @@ struct irq_remap_ops { /* Enable fault handling */ int (*enable_faulting)(void); - - /* Get the irqdomain associated to IOMMU device */ - struct irq_domain *(*get_irq_domain)(struct irq_alloc_info *); }; extern struct irq_remap_ops intel_irq_remap_ops; diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 76cd7ebd1178..6440f97c412e 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -42,7 +42,16 @@ static inline void debugfs_add_domain_dir(struct irq_domain *d) { } static inline void debugfs_remove_domain_dir(struct irq_domain *d) { } #endif -const struct fwnode_operations irqchip_fwnode_ops; +static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode) +{ + struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode); + + return fwid->name; +} + +const struct fwnode_operations irqchip_fwnode_ops = { + .get_name = irqchip_fwnode_get_name, +}; EXPORT_SYMBOL_GPL(irqchip_fwnode_ops); /**
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