On Fri, 2017-12-29 at 14:10 +0100, Thomas Gleixner wrote: > On Fri, 29 Dec 2017, Andy Shevchenko wrote: > > > On Thu, 2017-12-28 at 22:59 +0100, Thomas Gleixner wrote: > > > On Thu, 28 Dec 2017, Thomas Gleixner wrote: > > > > On Thu, 28 Dec 2017, Andy Shevchenko wrote: > > > > > The result w/o above is (full log is available here > > > > > https://pastebin.com > > > > > /J5yaTbM9): > > > > > > > > Ok. Which irqs are related to that ISP thingy? > > > > > > > > Are these interrupts MSI? > > > > Yes, they are MSI. > > > > > And looking at the log, I see that you can load the driver > > > successfully and > > > the trouble starts afterwards when you actually use it. > > > > Correct. > > > > > Can you please enable CONFIG_GENERIC_IRQ_DEBUGFS and after login, > > > check > > > which interrupt is assigned to that atomisp thingy and then > > > provide > > > the > > > output of > > > > > > cat /sys/kernel/debug/irq/irqs/$ATOMISPIRQ > > > > Full log, including output of the above. > > > > https://pastebin.com/4jammqi5 > > Thanks for the info. Can you please test the patch below? Thanks for the patch. It does a trick! P.S. I noticed that it's combined from at least one that is already in x86/urgent, so, feel free to add my Reported-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Tested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> to the rest > > Thanks, > > tglx > > 8<-------------------- > --- a/kernel/irq/msi.c > +++ b/kernel/irq/msi.c > @@ -339,6 +339,40 @@ int msi_domain_populate_irqs(struct irq_ > return ret; > } > > +/* > + * Carefully check whether the device can use reservation mode. If > + * reservation mode is enabled then the early activation will assign > a > + * dummy vector to the device. If the PCI/MSI device does not support > + * masking of the entry then this can result in spurious interrupts > when > + * the device driver is not absolutely careful. But even then a > malfunction > + * of the hardware could result in a spurious interrupt on the dummy > vector > + * and render the device unusable. If the entry can be masked then > the core > + * logic will prevent the spurious interrupt and reservation mode can > be > + * used. For now reservation mode is restricted to PCI/MSI. > + */ > +static bool msi_check_reservation_mode(struct irq_domain *domain, > + struct msi_domain_info *info, > + struct device *dev) > +{ > + struct msi_desc *desc; > + > + if (domain->bus_token != DOMAIN_BUS_PCI_MSI) > + return false; > + > + if (!(info->flags & MSI_FLAG_MUST_REACTIVATE)) > + return false; > + > + if (IS_ENABLED(CONFIG_PCI_MSI) && pci_msi_ignore_mask) > + return false; > + > + /* > + * Checking the first MSI descriptor is sufficient. MSIX > supports > + * masking and MSI does so when the maskbit is set. > + */ > + desc = first_msi_entry(dev); > + return desc->msi_attrib.is_msix || desc->msi_attrib.maskbit; > +} > + > /** > * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt > domain > * @domain: The domain to allocate from > @@ -353,9 +387,11 @@ int msi_domain_alloc_irqs(struct irq_dom > { > struct msi_domain_info *info = domain->host_data; > struct msi_domain_ops *ops = info->ops; > - msi_alloc_info_t arg; > + struct irq_data *irq_data; > struct msi_desc *desc; > + msi_alloc_info_t arg; > int i, ret, virq; > + bool can_reserve; > > ret = msi_domain_prepare_irqs(domain, dev, nvec, &arg); > if (ret) > @@ -385,6 +421,8 @@ int msi_domain_alloc_irqs(struct irq_dom > if (ops->msi_finish) > ops->msi_finish(&arg, 0); > > + can_reserve = msi_check_reservation_mode(domain, info, dev); > + > for_each_msi_entry(desc, dev) { > virq = desc->irq; > if (desc->nvec_used == 1) > @@ -397,17 +435,28 @@ int msi_domain_alloc_irqs(struct irq_dom > * the MSI entries before the PCI layer enables MSI > in the > * card. Otherwise the card latches a random msi > message. > */ > - if (info->flags & MSI_FLAG_ACTIVATE_EARLY) { > - struct irq_data *irq_data; > + if (!(info->flags & MSI_FLAG_ACTIVATE_EARLY)) > + continue; > > + irq_data = irq_domain_get_irq_data(domain, desc- > >irq); > + if (!can_reserve) > + irqd_clr_can_reserve(irq_data); > + ret = irq_domain_activate_irq(irq_data, can_reserve); > + if (ret) > + goto cleanup; > + } > + > + /* > + * If these interrupts use reservation mode clear the > activated bit > + * so request_irq() will assign the final vector. > + */ > + if (can_reserve) { > + for_each_msi_entry(desc, dev) { > irq_data = irq_domain_get_irq_data(domain, > desc->irq); > - ret = irq_domain_activate_irq(irq_data, > true); > - if (ret) > - goto cleanup; > - if (info->flags & MSI_FLAG_MUST_REACTIVATE) > - irqd_clr_activated(irq_data); > + irqd_clr_activated(irq_data); > } > } > + > return 0; > > cleanup: > --- a/arch/x86/kernel/apic/vector.c > +++ b/arch/x86/kernel/apic/vector.c > @@ -184,6 +184,7 @@ static void reserve_irq_vector_locked(st > irq_matrix_reserve(vector_matrix); > apicd->can_reserve = true; > apicd->has_reserved = true; > + irqd_set_can_reserve(irqd); > trace_vector_reserve(irqd->irq, 0); > vector_assign_managed_shutdown(irqd); > } > @@ -368,8 +369,18 @@ static int activate_reserved(struct irq_ > int ret; > > ret = assign_irq_vector_any_locked(irqd); > - if (!ret) > + if (!ret) { > apicd->has_reserved = false; > + /* > + * Core might have disabled reservation mode after > + * allocating the irq descriptor. Ideally this should > + * happen before allocation time, but that would > require > + * completely convoluted ways of transporting that > + * information. > + */ > + if (!irqd_can_reserve(irqd)) > + apicd->can_reserve = false; > + } > return ret; > } > > @@ -478,6 +489,7 @@ static bool vector_configure_legacy(unsi > } else { > /* Release the vector */ > apicd->can_reserve = true; > + irqd_set_can_reserve(irqd); > clear_irq_vector(irqd); > realloc = true; > } > --- a/include/linux/irq.h > +++ b/include/linux/irq.h > @@ -212,6 +212,7 @@ struct irq_data { > * mask. Applies only to affinity > managed irqs. > * IRQD_SINGLE_TARGET - IRQ allows only a single > affinity target > * IRQD_DEFAULT_TRIGGER_SET - Expected trigger already been > set > + * IRQD_CAN_RESERVE - Can use reservation mode > */ > enum { > IRQD_TRIGGER_MASK = 0xf, > @@ -233,6 +234,7 @@ enum { > IRQD_MANAGED_SHUTDOWN = (1 << 23), > IRQD_SINGLE_TARGET = (1 << 24), > IRQD_DEFAULT_TRIGGER_SET = (1 << 25), > + IRQD_CAN_RESERVE = (1 << 26), > }; > > #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, > state_use_accessors) > @@ -377,6 +379,21 @@ static inline bool irqd_is_managed_and_s > return __irqd_to_state(d) & IRQD_MANAGED_SHUTDOWN; > } > > +static inline void irqd_set_can_reserve(struct irq_data *d) > +{ > + __irqd_to_state(d) |= IRQD_CAN_RESERVE; > +} > + > +static inline void irqd_clr_can_reserve(struct irq_data *d) > +{ > + __irqd_to_state(d) &= ~IRQD_CAN_RESERVE; > +} > + > +static inline bool irqd_can_reserve(struct irq_data *d) > +{ > + return __irqd_to_state(d) & IRQD_CAN_RESERVE; > +} > + > #undef __irqd_to_state > > static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d) > --- a/kernel/irq/debugfs.c > +++ b/kernel/irq/debugfs.c > @@ -113,6 +113,7 @@ static const struct irq_bit_descr irqdat > BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING), > BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED), > BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN), > + BIT_MASK_DESCR(IRQD_CAN_RESERVE), > > BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU), > > --- a/arch/x86/kernel/apic/apic_flat_64.c > +++ b/arch/x86/kernel/apic/apic_flat_64.c > @@ -151,7 +151,7 @@ static struct apic apic_flat __ro_after_ > .apic_id_valid = > default_apic_id_valid, > .apic_id_registered = flat_apic_id_registered, > > - .irq_delivery_mode = dest_LowestPrio, > + .irq_delivery_mode = dest_Fixed, > .irq_dest_mode = 1, /* logical */ > > .disable_esr = 0, > --- a/arch/x86/kernel/apic/apic_noop.c > +++ b/arch/x86/kernel/apic/apic_noop.c > @@ -110,7 +110,7 @@ struct apic apic_noop __ro_after_init = > .apic_id_valid = > default_apic_id_valid, > .apic_id_registered = noop_apic_id_registered, > > - .irq_delivery_mode = dest_LowestPrio, > + .irq_delivery_mode = dest_Fixed, > /* logical delivery broadcast to all CPUs: */ > .irq_dest_mode = 1, > > --- a/arch/x86/kernel/apic/msi.c > +++ b/arch/x86/kernel/apic/msi.c > @@ -39,17 +39,13 @@ static void irq_msi_compose_msg(struct i > ((apic->irq_dest_mode == 0) ? > MSI_ADDR_DEST_MODE_PHYSICAL : > MSI_ADDR_DEST_MODE_LOGICAL) | > - ((apic->irq_delivery_mode != dest_LowestPrio) ? > - MSI_ADDR_REDIRECTION_CPU : > - MSI_ADDR_REDIRECTION_LOWPRI) | > + MSI_ADDR_REDIRECTION_CPU | > MSI_ADDR_DEST_ID(cfg->dest_apicid); > > msg->data = > MSI_DATA_TRIGGER_EDGE | > MSI_DATA_LEVEL_ASSERT | > - ((apic->irq_delivery_mode != dest_LowestPrio) ? > - MSI_DATA_DELIVERY_FIXED : > - MSI_DATA_DELIVERY_LOWPRI) | > + MSI_DATA_DELIVERY_FIXED | > MSI_DATA_VECTOR(cfg->vector); > } > > --- a/arch/x86/kernel/apic/probe_32.c > +++ b/arch/x86/kernel/apic/probe_32.c > @@ -105,7 +105,7 @@ static struct apic apic_default __ro_aft > .apic_id_valid = > default_apic_id_valid, > .apic_id_registered = > default_apic_id_registered, > > - .irq_delivery_mode = dest_LowestPrio, > + .irq_delivery_mode = dest_Fixed, > /* logical delivery broadcast to all CPUs: */ > .irq_dest_mode = 1, > > --- a/arch/x86/kernel/apic/x2apic_cluster.c > +++ b/arch/x86/kernel/apic/x2apic_cluster.c > @@ -184,7 +184,7 @@ static struct apic apic_x2apic_cluster _ > .apic_id_valid = x2apic_apic_id_valid, > .apic_id_registered = > x2apic_apic_id_registered, > > - .irq_delivery_mode = dest_LowestPrio, > + .irq_delivery_mode = dest_Fixed, > .irq_dest_mode = 1, /* logical */ > > .disable_esr = 0, > --- a/drivers/pci/host/pci-hyperv.c > +++ b/drivers/pci/host/pci-hyperv.c > @@ -985,9 +985,7 @@ static u32 hv_compose_msi_req_v1( > int_pkt->wslot.slot = slot; > int_pkt->int_desc.vector = vector; > int_pkt->int_desc.vector_count = 1; > - int_pkt->int_desc.delivery_mode = > - (apic->irq_delivery_mode == dest_LowestPrio) ? > - dest_LowestPrio : dest_Fixed; > + int_pkt->int_desc.delivery_mode = dest_Fixed; > > /* > * Create MSI w/ dummy vCPU set, overwritten by subsequent > retarget in > @@ -1008,9 +1006,7 @@ static u32 hv_compose_msi_req_v2( > int_pkt->wslot.slot = slot; > int_pkt->int_desc.vector = vector; > int_pkt->int_desc.vector_count = 1; > - int_pkt->int_desc.delivery_mode = > - (apic->irq_delivery_mode == dest_LowestPrio) ? > - dest_LowestPrio : dest_Fixed; > + int_pkt->int_desc.delivery_mode = dest_Fixed; > > /* > * Create MSI w/ dummy vCPU set targeting just one vCPU, > overwritten -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy
