diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 52 |
1 files changed, 42 insertions, 10 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index aae53326d26f..1259f7f86a21 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -189,6 +189,15 @@ static DEFINE_IDA(its_vpeid_ida); #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base) #define gic_data_rdist_vlpi_base() (gic_data_rdist_rd_base() + SZ_128K) +/* + * Skip ITSs that have no vLPIs mapped, unless we're on GICv4.1, as we + * always have vSGIs mapped. + */ +static bool require_its_list_vmovp(struct its_vm *vm, struct its_node *its) +{ + return (gic_rdists->has_rvpeid || vm->vlpi_count[its->list_nr]); +} + static u16 get_its_list(struct its_vm *vm) { struct its_node *its; @@ -198,7 +207,7 @@ static u16 get_its_list(struct its_vm *vm) if (!is_v4(its)) continue; - if (vm->vlpi_count[its->list_nr]) + if (require_its_list_vmovp(vm, its)) __set_bit(its->list_nr, &its_list); } @@ -1295,7 +1304,7 @@ static void its_send_vmovp(struct its_vpe *vpe) if (!is_v4(its)) continue; - if (!vpe->its_vm->vlpi_count[its->list_nr]) + if (!require_its_list_vmovp(vpe->its_vm, its)) continue; desc.its_vmovp_cmd.col = &its->collections[col_id]; @@ -1586,12 +1595,31 @@ static int its_irq_set_irqchip_state(struct irq_data *d, return 0; } +/* + * Two favourable cases: + * + * (a) Either we have a GICv4.1, and all vPEs have to be mapped at all times + * for vSGI delivery + * + * (b) Or the ITSs do not use a list map, meaning that VMOVP is cheap enough + * and we're better off mapping all VPEs always + * + * If neither (a) nor (b) is true, then we map vPEs on demand. + * + */ +static bool gic_requires_eager_mapping(void) +{ + if (!its_list_map || gic_rdists->has_rvpeid) + return true; + + return false; +} + static void its_map_vm(struct its_node *its, struct its_vm *vm) { unsigned long flags; - /* Not using the ITS list? Everything is always mapped. */ - if (!its_list_map) + if (gic_requires_eager_mapping()) return; raw_spin_lock_irqsave(&vmovp_lock, flags); @@ -1625,7 +1653,7 @@ static void its_unmap_vm(struct its_node *its, struct its_vm *vm) unsigned long flags; /* Not using the ITS list? Everything is always mapped. */ - if (!its_list_map) + if (gic_requires_eager_mapping()) return; raw_spin_lock_irqsave(&vmovp_lock, flags); @@ -4282,8 +4310,12 @@ static int its_vpe_irq_domain_activate(struct irq_domain *domain, struct its_vpe *vpe = irq_data_get_irq_chip_data(d); struct its_node *its; - /* If we use the list map, we issue VMAPP on demand... */ - if (its_list_map) + /* + * If we use the list map, we issue VMAPP on demand... Unless + * we're on a GICv4.1 and we eagerly map the VPE on all ITSs + * so that VSGIs can work. + */ + if (!gic_requires_eager_mapping()) return 0; /* Map the VPE to the first possible CPU */ @@ -4309,10 +4341,10 @@ static void its_vpe_irq_domain_deactivate(struct irq_domain *domain, struct its_node *its; /* - * If we use the list map, we unmap the VPE once no VLPIs are - * associated with the VM. + * If we use the list map on GICv4.0, we unmap the VPE once no + * VLPIs are associated with the VM. */ - if (its_list_map) + if (!gic_requires_eager_mapping()) return; list_for_each_entry(its, &its_nodes, entry) { |