diff options
Diffstat (limited to 'arch/sparc/kernel/irq_64.c')
| -rw-r--r-- | arch/sparc/kernel/irq_64.c | 1156 |
1 files changed, 1156 insertions, 0 deletions
diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c new file mode 100644 index 000000000..3ec9f1402 --- /dev/null +++ b/arch/sparc/kernel/irq_64.c @@ -0,0 +1,1156 @@ +// SPDX-License-Identifier: GPL-2.0 +/* irq.c: UltraSparc IRQ handling/init/registry. + * + * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net) + * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) + * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) + */ + +#include <linux/sched.h> +#include <linux/linkage.h> +#include <linux/ptrace.h> +#include <linux/errno.h> +#include <linux/kernel_stat.h> +#include <linux/signal.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/random.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/ftrace.h> +#include <linux/irq.h> + +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <linux/atomic.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/iommu.h> +#include <asm/upa.h> +#include <asm/oplib.h> +#include <asm/prom.h> +#include <asm/timer.h> +#include <asm/smp.h> +#include <asm/starfire.h> +#include <linux/uaccess.h> +#include <asm/cache.h> +#include <asm/cpudata.h> +#include <asm/auxio.h> +#include <asm/head.h> +#include <asm/hypervisor.h> +#include <asm/cacheflush.h> + +#include "entry.h" +#include "cpumap.h" +#include "kstack.h" + +struct ino_bucket *ivector_table; +unsigned long ivector_table_pa; + +/* On several sun4u processors, it is illegal to mix bypass and + * non-bypass accesses. Therefore we access all INO buckets + * using bypass accesses only. + */ +static unsigned long bucket_get_chain_pa(unsigned long bucket_pa) +{ + unsigned long ret; + + __asm__ __volatile__("ldxa [%1] %2, %0" + : "=&r" (ret) + : "r" (bucket_pa + + offsetof(struct ino_bucket, + __irq_chain_pa)), + "i" (ASI_PHYS_USE_EC)); + + return ret; +} + +static void bucket_clear_chain_pa(unsigned long bucket_pa) +{ + __asm__ __volatile__("stxa %%g0, [%0] %1" + : /* no outputs */ + : "r" (bucket_pa + + offsetof(struct ino_bucket, + __irq_chain_pa)), + "i" (ASI_PHYS_USE_EC)); +} + +static unsigned int bucket_get_irq(unsigned long bucket_pa) +{ + unsigned int ret; + + __asm__ __volatile__("lduwa [%1] %2, %0" + : "=&r" (ret) + : "r" (bucket_pa + + offsetof(struct ino_bucket, + __irq)), + "i" (ASI_PHYS_USE_EC)); + + return ret; +} + +static void bucket_set_irq(unsigned long bucket_pa, unsigned int irq) +{ + __asm__ __volatile__("stwa %0, [%1] %2" + : /* no outputs */ + : "r" (irq), + "r" (bucket_pa + + offsetof(struct ino_bucket, + __irq)), + "i" (ASI_PHYS_USE_EC)); +} + +#define irq_work_pa(__cpu) &(trap_block[(__cpu)].irq_worklist_pa) + +static unsigned long hvirq_major __initdata; +static int __init early_hvirq_major(char *p) +{ + int rc = kstrtoul(p, 10, &hvirq_major); + + return rc; +} +early_param("hvirq", early_hvirq_major); + +static int hv_irq_version; + +/* Major version 2.0 of HV_GRP_INTR added support for the VIRQ cookie + * based interfaces, but: + * + * 1) Several OSs, Solaris and Linux included, use them even when only + * negotiating version 1.0 (or failing to negotiate at all). So the + * hypervisor has a workaround that provides the VIRQ interfaces even + * when only verion 1.0 of the API is in use. + * + * 2) Second, and more importantly, with major version 2.0 these VIRQ + * interfaces only were actually hooked up for LDC interrupts, even + * though the Hypervisor specification clearly stated: + * + * The new interrupt API functions will be available to a guest + * when it negotiates version 2.0 in the interrupt API group 0x2. When + * a guest negotiates version 2.0, all interrupt sources will only + * support using the cookie interface, and any attempt to use the + * version 1.0 interrupt APIs numbered 0xa0 to 0xa6 will result in the + * ENOTSUPPORTED error being returned. + * + * with an emphasis on "all interrupt sources". + * + * To correct this, major version 3.0 was created which does actually + * support VIRQs for all interrupt sources (not just LDC devices). So + * if we want to move completely over the cookie based VIRQs we must + * negotiate major version 3.0 or later of HV_GRP_INTR. + */ +static bool sun4v_cookie_only_virqs(void) +{ + if (hv_irq_version >= 3) + return true; + return false; +} + +static void __init irq_init_hv(void) +{ + unsigned long hv_error, major, minor = 0; + + if (tlb_type != hypervisor) + return; + + if (hvirq_major) + major = hvirq_major; + else + major = 3; + + hv_error = sun4v_hvapi_register(HV_GRP_INTR, major, &minor); + if (!hv_error) + hv_irq_version = major; + else + hv_irq_version = 1; + + pr_info("SUN4V: Using IRQ API major %d, cookie only virqs %s\n", + hv_irq_version, + sun4v_cookie_only_virqs() ? "enabled" : "disabled"); +} + +/* This function is for the timer interrupt.*/ +int __init arch_probe_nr_irqs(void) +{ + return 1; +} + +#define DEFAULT_NUM_IVECS (0xfffU) +static unsigned int nr_ivec = DEFAULT_NUM_IVECS; +#define NUM_IVECS (nr_ivec) + +static unsigned int __init size_nr_ivec(void) +{ + if (tlb_type == hypervisor) { + switch (sun4v_chip_type) { + /* Athena's devhandle|devino is large.*/ + case SUN4V_CHIP_SPARC64X: + nr_ivec = 0xffff; + break; + } + } + return nr_ivec; +} + +struct irq_handler_data { + union { + struct { + unsigned int dev_handle; + unsigned int dev_ino; + }; + unsigned long sysino; + }; + struct ino_bucket bucket; + unsigned long iclr; + unsigned long imap; +}; + +static inline unsigned int irq_data_to_handle(struct irq_data *data) +{ + struct irq_handler_data *ihd = irq_data_get_irq_handler_data(data); + + return ihd->dev_handle; +} + +static inline unsigned int irq_data_to_ino(struct irq_data *data) +{ + struct irq_handler_data *ihd = irq_data_get_irq_handler_data(data); + + return ihd->dev_ino; +} + +static inline unsigned long irq_data_to_sysino(struct irq_data *data) +{ + struct irq_handler_data *ihd = irq_data_get_irq_handler_data(data); + + return ihd->sysino; +} + +void irq_free(unsigned int irq) +{ + void *data = irq_get_handler_data(irq); + + kfree(data); + irq_set_handler_data(irq, NULL); + irq_free_descs(irq, 1); +} + +unsigned int irq_alloc(unsigned int dev_handle, unsigned int dev_ino) +{ + int irq; + + irq = __irq_alloc_descs(-1, 1, 1, numa_node_id(), NULL, NULL); + if (irq <= 0) + goto out; + + return irq; +out: + return 0; +} + +static unsigned int cookie_exists(u32 devhandle, unsigned int devino) +{ + unsigned long hv_err, cookie; + struct ino_bucket *bucket; + unsigned int irq = 0U; + + hv_err = sun4v_vintr_get_cookie(devhandle, devino, &cookie); + if (hv_err) { + pr_err("HV get cookie failed hv_err = %ld\n", hv_err); + goto out; + } + + if (cookie & ((1UL << 63UL))) { + cookie = ~cookie; + bucket = (struct ino_bucket *) __va(cookie); + irq = bucket->__irq; + } +out: + return irq; +} + +static unsigned int sysino_exists(u32 devhandle, unsigned int devino) +{ + unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino); + struct ino_bucket *bucket; + unsigned int irq; + + bucket = &ivector_table[sysino]; + irq = bucket_get_irq(__pa(bucket)); + + return irq; +} + +void ack_bad_irq(unsigned int irq) +{ + pr_crit("BAD IRQ ack %d\n", irq); +} + +void irq_install_pre_handler(int irq, + void (*func)(unsigned int, void *, void *), + void *arg1, void *arg2) +{ + pr_warn("IRQ pre handler NOT supported.\n"); +} + +/* + * /proc/interrupts printing: + */ +int arch_show_interrupts(struct seq_file *p, int prec) +{ + int j; + + seq_printf(p, "NMI: "); + for_each_online_cpu(j) + seq_printf(p, "%10u ", cpu_data(j).__nmi_count); + seq_printf(p, " Non-maskable interrupts\n"); + return 0; +} + +static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid) +{ + unsigned int tid; + + if (this_is_starfire) { + tid = starfire_translate(imap, cpuid); + tid <<= IMAP_TID_SHIFT; + tid &= IMAP_TID_UPA; + } else { + if (tlb_type == cheetah || tlb_type == cheetah_plus) { + unsigned long ver; + + __asm__ ("rdpr %%ver, %0" : "=r" (ver)); + if ((ver >> 32UL) == __JALAPENO_ID || + (ver >> 32UL) == __SERRANO_ID) { + tid = cpuid << IMAP_TID_SHIFT; + tid &= IMAP_TID_JBUS; + } else { + unsigned int a = cpuid & 0x1f; + unsigned int n = (cpuid >> 5) & 0x1f; + + tid = ((a << IMAP_AID_SHIFT) | + (n << IMAP_NID_SHIFT)); + tid &= (IMAP_AID_SAFARI | + IMAP_NID_SAFARI); + } + } else { + tid = cpuid << IMAP_TID_SHIFT; + tid &= IMAP_TID_UPA; + } + } + + return tid; +} + +#ifdef CONFIG_SMP +static int irq_choose_cpu(unsigned int irq, const struct cpumask *affinity) +{ + cpumask_t mask; + int cpuid; + + cpumask_copy(&mask, affinity); + if (cpumask_equal(&mask, cpu_online_mask)) { + cpuid = map_to_cpu(irq); + } else { + cpumask_t tmp; + + cpumask_and(&tmp, cpu_online_mask, &mask); + cpuid = cpumask_empty(&tmp) ? map_to_cpu(irq) : cpumask_first(&tmp); + } + + return cpuid; +} +#else +#define irq_choose_cpu(irq, affinity) \ + real_hard_smp_processor_id() +#endif + +static void sun4u_irq_enable(struct irq_data *data) +{ + struct irq_handler_data *handler_data; + + handler_data = irq_data_get_irq_handler_data(data); + if (likely(handler_data)) { + unsigned long cpuid, imap, val; + unsigned int tid; + + cpuid = irq_choose_cpu(data->irq, + irq_data_get_affinity_mask(data)); + imap = handler_data->imap; + + tid = sun4u_compute_tid(imap, cpuid); + + val = upa_readq(imap); + val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS | + IMAP_AID_SAFARI | IMAP_NID_SAFARI); + val |= tid | IMAP_VALID; + upa_writeq(val, imap); + upa_writeq(ICLR_IDLE, handler_data->iclr); + } +} + +static int sun4u_set_affinity(struct irq_data *data, + const struct cpumask *mask, bool force) +{ + struct irq_handler_data *handler_data; + + handler_data = irq_data_get_irq_handler_data(data); + if (likely(handler_data)) { + unsigned long cpuid, imap, val; + unsigned int tid; + + cpuid = irq_choose_cpu(data->irq, mask); + imap = handler_data->imap; + + tid = sun4u_compute_tid(imap, cpuid); + + val = upa_readq(imap); + val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS | + IMAP_AID_SAFARI | IMAP_NID_SAFARI); + val |= tid | IMAP_VALID; + upa_writeq(val, imap); + upa_writeq(ICLR_IDLE, handler_data->iclr); + } + + return 0; +} + +/* Don't do anything. The desc->status check for IRQ_DISABLED in + * handler_irq() will skip the handler call and that will leave the + * interrupt in the sent state. The next ->enable() call will hit the + * ICLR register to reset the state machine. + * + * This scheme is necessary, instead of clearing the Valid bit in the + * IMAP register, to handle the case of IMAP registers being shared by + * multiple INOs (and thus ICLR registers). Since we use a different + * virtual IRQ for each shared IMAP instance, the generic code thinks + * there is only one user so it prematurely calls ->disable() on + * free_irq(). + * + * We have to provide an explicit ->disable() method instead of using + * NULL to get the default. The reason is that if the generic code + * sees that, it also hooks up a default ->shutdown method which + * invokes ->mask() which we do not want. See irq_chip_set_defaults(). + */ +static void sun4u_irq_disable(struct irq_data *data) +{ +} + +static void sun4u_irq_eoi(struct irq_data *data) +{ + struct irq_handler_data *handler_data; + + handler_data = irq_data_get_irq_handler_data(data); + if (likely(handler_data)) + upa_writeq(ICLR_IDLE, handler_data->iclr); +} + +static void sun4v_irq_enable(struct irq_data *data) +{ + unsigned long cpuid = irq_choose_cpu(data->irq, + irq_data_get_affinity_mask(data)); + unsigned int ino = irq_data_to_sysino(data); + int err; + + err = sun4v_intr_settarget(ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): " + "err(%d)\n", ino, cpuid, err); + err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setstate(%x): " + "err(%d)\n", ino, err); + err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n", + ino, err); +} + +static int sun4v_set_affinity(struct irq_data *data, + const struct cpumask *mask, bool force) +{ + unsigned long cpuid = irq_choose_cpu(data->irq, mask); + unsigned int ino = irq_data_to_sysino(data); + int err; + + err = sun4v_intr_settarget(ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): " + "err(%d)\n", ino, cpuid, err); + + return 0; +} + +static void sun4v_irq_disable(struct irq_data *data) +{ + unsigned int ino = irq_data_to_sysino(data); + int err; + + err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setenabled(%x): " + "err(%d)\n", ino, err); +} + +static void sun4v_irq_eoi(struct irq_data *data) +{ + unsigned int ino = irq_data_to_sysino(data); + int err; + + err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setstate(%x): " + "err(%d)\n", ino, err); +} + +static void sun4v_virq_enable(struct irq_data *data) +{ + unsigned long dev_handle = irq_data_to_handle(data); + unsigned long dev_ino = irq_data_to_ino(data); + unsigned long cpuid; + int err; + + cpuid = irq_choose_cpu(data->irq, irq_data_get_affinity_mask(data)); + + err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): " + "err(%d)\n", + dev_handle, dev_ino, cpuid, err); + err = sun4v_vintr_set_state(dev_handle, dev_ino, + HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_STATE_IDLE): err(%d)\n", + dev_handle, dev_ino, err); + err = sun4v_vintr_set_valid(dev_handle, dev_ino, + HV_INTR_ENABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_ENABLED): err(%d)\n", + dev_handle, dev_ino, err); +} + +static int sun4v_virt_set_affinity(struct irq_data *data, + const struct cpumask *mask, bool force) +{ + unsigned long dev_handle = irq_data_to_handle(data); + unsigned long dev_ino = irq_data_to_ino(data); + unsigned long cpuid; + int err; + + cpuid = irq_choose_cpu(data->irq, mask); + + err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): " + "err(%d)\n", + dev_handle, dev_ino, cpuid, err); + + return 0; +} + +static void sun4v_virq_disable(struct irq_data *data) +{ + unsigned long dev_handle = irq_data_to_handle(data); + unsigned long dev_ino = irq_data_to_ino(data); + int err; + + + err = sun4v_vintr_set_valid(dev_handle, dev_ino, + HV_INTR_DISABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_DISABLED): err(%d)\n", + dev_handle, dev_ino, err); +} + +static void sun4v_virq_eoi(struct irq_data *data) +{ + unsigned long dev_handle = irq_data_to_handle(data); + unsigned long dev_ino = irq_data_to_ino(data); + int err; + + err = sun4v_vintr_set_state(dev_handle, dev_ino, + HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_STATE_IDLE): err(%d)\n", + dev_handle, dev_ino, err); +} + +static struct irq_chip sun4u_irq = { + .name = "sun4u", + .irq_enable = sun4u_irq_enable, + .irq_disable = sun4u_irq_disable, + .irq_eoi = sun4u_irq_eoi, + .irq_set_affinity = sun4u_set_affinity, + .flags = IRQCHIP_EOI_IF_HANDLED, +}; + +static struct irq_chip sun4v_irq = { + .name = "sun4v", + .irq_enable = sun4v_irq_enable, + .irq_disable = sun4v_irq_disable, + .irq_eoi = sun4v_irq_eoi, + .irq_set_affinity = sun4v_set_affinity, + .flags = IRQCHIP_EOI_IF_HANDLED, +}; + +static struct irq_chip sun4v_virq = { + .name = "vsun4v", + .irq_enable = sun4v_virq_enable, + .irq_disable = sun4v_virq_disable, + .irq_eoi = sun4v_virq_eoi, + .irq_set_affinity = sun4v_virt_set_affinity, + .flags = IRQCHIP_EOI_IF_HANDLED, +}; + +unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap) +{ + struct irq_handler_data *handler_data; + struct ino_bucket *bucket; + unsigned int irq; + int ino; + + BUG_ON(tlb_type == hypervisor); + + ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup; + bucket = &ivector_table[ino]; + irq = bucket_get_irq(__pa(bucket)); + if (!irq) { + irq = irq_alloc(0, ino); + bucket_set_irq(__pa(bucket), irq); + irq_set_chip_and_handler_name(irq, &sun4u_irq, + handle_fasteoi_irq, "IVEC"); + } + + handler_data = irq_get_handler_data(irq); + if (unlikely(handler_data)) + goto out; + + handler_data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC); + if (unlikely(!handler_data)) { + prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n"); + prom_halt(); + } + irq_set_handler_data(irq, handler_data); + + handler_data->imap = imap; + handler_data->iclr = iclr; + +out: + return irq; +} + +static unsigned int sun4v_build_common(u32 devhandle, unsigned int devino, + void (*handler_data_init)(struct irq_handler_data *data, + u32 devhandle, unsigned int devino), + struct irq_chip *chip) +{ + struct irq_handler_data *data; + unsigned int irq; + + irq = irq_alloc(devhandle, devino); + if (!irq) + goto out; + + data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC); + if (unlikely(!data)) { + pr_err("IRQ handler data allocation failed.\n"); + irq_free(irq); + irq = 0; + goto out; + } + + irq_set_handler_data(irq, data); + handler_data_init(data, devhandle, devino); + irq_set_chip_and_handler_name(irq, chip, handle_fasteoi_irq, "IVEC"); + data->imap = ~0UL; + data->iclr = ~0UL; +out: + return irq; +} + +static unsigned long cookie_assign(unsigned int irq, u32 devhandle, + unsigned int devino) +{ + struct irq_handler_data *ihd = irq_get_handler_data(irq); + unsigned long hv_error, cookie; + + /* handler_irq needs to find the irq. cookie is seen signed in + * sun4v_dev_mondo and treated as a non ivector_table delivery. + */ + ihd->bucket.__irq = irq; + cookie = ~__pa(&ihd->bucket); + + hv_error = sun4v_vintr_set_cookie(devhandle, devino, cookie); + if (hv_error) + pr_err("HV vintr set cookie failed = %ld\n", hv_error); + + return hv_error; +} + +static void cookie_handler_data(struct irq_handler_data *data, + u32 devhandle, unsigned int devino) +{ + data->dev_handle = devhandle; + data->dev_ino = devino; +} + +static unsigned int cookie_build_irq(u32 devhandle, unsigned int devino, + struct irq_chip *chip) +{ + unsigned long hv_error; + unsigned int irq; + + irq = sun4v_build_common(devhandle, devino, cookie_handler_data, chip); + + hv_error = cookie_assign(irq, devhandle, devino); + if (hv_error) { + irq_free(irq); + irq = 0; + } + + return irq; +} + +static unsigned int sun4v_build_cookie(u32 devhandle, unsigned int devino) +{ + unsigned int irq; + + irq = cookie_exists(devhandle, devino); + if (irq) + goto out; + + irq = cookie_build_irq(devhandle, devino, &sun4v_virq); + +out: + return irq; +} + +static void sysino_set_bucket(unsigned int irq) +{ + struct irq_handler_data *ihd = irq_get_handler_data(irq); + struct ino_bucket *bucket; + unsigned long sysino; + + sysino = sun4v_devino_to_sysino(ihd->dev_handle, ihd->dev_ino); + BUG_ON(sysino >= nr_ivec); + bucket = &ivector_table[sysino]; + bucket_set_irq(__pa(bucket), irq); +} + +static void sysino_handler_data(struct irq_handler_data *data, + u32 devhandle, unsigned int devino) +{ + unsigned long sysino; + + sysino = sun4v_devino_to_sysino(devhandle, devino); + data->sysino = sysino; +} + +static unsigned int sysino_build_irq(u32 devhandle, unsigned int devino, + struct irq_chip *chip) +{ + unsigned int irq; + + irq = sun4v_build_common(devhandle, devino, sysino_handler_data, chip); + if (!irq) + goto out; + + sysino_set_bucket(irq); +out: + return irq; +} + +static int sun4v_build_sysino(u32 devhandle, unsigned int devino) +{ + int irq; + + irq = sysino_exists(devhandle, devino); + if (irq) + goto out; + + irq = sysino_build_irq(devhandle, devino, &sun4v_irq); +out: + return irq; +} + +unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino) +{ + unsigned int irq; + + if (sun4v_cookie_only_virqs()) + irq = sun4v_build_cookie(devhandle, devino); + else + irq = sun4v_build_sysino(devhandle, devino); + + return irq; +} + +unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino) +{ + int irq; + + irq = cookie_build_irq(devhandle, devino, &sun4v_virq); + if (!irq) + goto out; + + /* This is borrowed from the original function. + */ + irq_set_status_flags(irq, IRQ_NOAUTOEN); + +out: + return irq; +} + +void *hardirq_stack[NR_CPUS]; +void *softirq_stack[NR_CPUS]; + +void __irq_entry handler_irq(int pil, struct pt_regs *regs) +{ + unsigned long pstate, bucket_pa; + struct pt_regs *old_regs; + void *orig_sp; + + clear_softint(1 << pil); + + old_regs = set_irq_regs(regs); + irq_enter(); + + /* Grab an atomic snapshot of the pending IVECs. */ + __asm__ __volatile__("rdpr %%pstate, %0\n\t" + "wrpr %0, %3, %%pstate\n\t" + "ldx [%2], %1\n\t" + "stx %%g0, [%2]\n\t" + "wrpr %0, 0x0, %%pstate\n\t" + : "=&r" (pstate), "=&r" (bucket_pa) + : "r" (irq_work_pa(smp_processor_id())), + "i" (PSTATE_IE) + : "memory"); + + orig_sp = set_hardirq_stack(); + + while (bucket_pa) { + unsigned long next_pa; + unsigned int irq; + + next_pa = bucket_get_chain_pa(bucket_pa); + irq = bucket_get_irq(bucket_pa); + bucket_clear_chain_pa(bucket_pa); + + generic_handle_irq(irq); + + bucket_pa = next_pa; + } + + restore_hardirq_stack(orig_sp); + + irq_exit(); + set_irq_regs(old_regs); +} + +void do_softirq_own_stack(void) +{ + void *orig_sp, *sp = softirq_stack[smp_processor_id()]; + + sp += THREAD_SIZE - 192 - STACK_BIAS; + + __asm__ __volatile__("mov %%sp, %0\n\t" + "mov %1, %%sp" + : "=&r" (orig_sp) + : "r" (sp)); + __do_softirq(); + __asm__ __volatile__("mov %0, %%sp" + : : "r" (orig_sp)); +} + +#ifdef CONFIG_HOTPLUG_CPU +void fixup_irqs(void) +{ + unsigned int irq; + + for (irq = 0; irq < NR_IRQS; irq++) { + struct irq_desc *desc = irq_to_desc(irq); + struct irq_data *data; + unsigned long flags; + + if (!desc) + continue; + data = irq_desc_get_irq_data(desc); + raw_spin_lock_irqsave(&desc->lock, flags); + if (desc->action && !irqd_is_per_cpu(data)) { + if (data->chip->irq_set_affinity) + data->chip->irq_set_affinity(data, + irq_data_get_affinity_mask(data), + false); + } + raw_spin_unlock_irqrestore(&desc->lock, flags); + } + + tick_ops->disable_irq(); +} +#endif + +struct sun5_timer { + u64 count0; + u64 limit0; + u64 count1; + u64 limit1; +}; + +static struct sun5_timer *prom_timers; +static u64 prom_limit0, prom_limit1; + +static void map_prom_timers(void) +{ + struct device_node *dp; + const unsigned int *addr; + + /* PROM timer node hangs out in the top level of device siblings... */ + dp = of_find_node_by_path("/"); + dp = dp->child; + while (dp) { + if (of_node_name_eq(dp, "counter-timer")) + break; + dp = dp->sibling; + } + + /* Assume if node is not present, PROM uses different tick mechanism + * which we should not care about. + */ + if (!dp) { + prom_timers = (struct sun5_timer *) 0; + return; + } + + /* If PROM is really using this, it must be mapped by him. */ + addr = of_get_property(dp, "address", NULL); + if (!addr) { + prom_printf("PROM does not have timer mapped, trying to continue.\n"); + prom_timers = (struct sun5_timer *) 0; + return; + } + prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]); +} + +static void kill_prom_timer(void) +{ + if (!prom_timers) + return; + + /* Save them away for later. */ + prom_limit0 = prom_timers->limit0; + prom_limit1 = prom_timers->limit1; + + /* Just as in sun4c PROM uses timer which ticks at IRQ 14. + * We turn both off here just to be paranoid. + */ + prom_timers->limit0 = 0; + prom_timers->limit1 = 0; + + /* Wheee, eat the interrupt packet too... */ + __asm__ __volatile__( +" mov 0x40, %%g2\n" +" ldxa [%%g0] %0, %%g1\n" +" ldxa [%%g2] %1, %%g1\n" +" stxa %%g0, [%%g0] %0\n" +" membar #Sync\n" + : /* no outputs */ + : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R) + : "g1", "g2"); +} + +void notrace init_irqwork_curcpu(void) +{ + int cpu = hard_smp_processor_id(); + + trap_block[cpu].irq_worklist_pa = 0UL; +} + +/* Please be very careful with register_one_mondo() and + * sun4v_register_mondo_queues(). + * + * On SMP this gets invoked from the CPU trampoline before + * the cpu has fully taken over the trap table from OBP, + * and it's kernel stack + %g6 thread register state is + * not fully cooked yet. + * + * Therefore you cannot make any OBP calls, not even prom_printf, + * from these two routines. + */ +static void notrace register_one_mondo(unsigned long paddr, unsigned long type, + unsigned long qmask) +{ + unsigned long num_entries = (qmask + 1) / 64; + unsigned long status; + + status = sun4v_cpu_qconf(type, paddr, num_entries); + if (status != HV_EOK) { + prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, " + "err %lu\n", type, paddr, num_entries, status); + prom_halt(); + } +} + +void notrace sun4v_register_mondo_queues(int this_cpu) +{ + struct trap_per_cpu *tb = &trap_block[this_cpu]; + + register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO, + tb->cpu_mondo_qmask); + register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO, + tb->dev_mondo_qmask); + register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR, + tb->resum_qmask); + register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR, + tb->nonresum_qmask); +} + +/* Each queue region must be a power of 2 multiple of 64 bytes in + * size. The base real address must be aligned to the size of the + * region. Thus, an 8KB queue must be 8KB aligned, for example. + */ +static void __init alloc_one_queue(unsigned long *pa_ptr, unsigned long qmask) +{ + unsigned long size = PAGE_ALIGN(qmask + 1); + unsigned long order = get_order(size); + unsigned long p; + + p = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); + if (!p) { + prom_printf("SUN4V: Error, cannot allocate queue.\n"); + prom_halt(); + } + + *pa_ptr = __pa(p); +} + +static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb) +{ +#ifdef CONFIG_SMP + unsigned long page; + void *mondo, *p; + + BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > PAGE_SIZE); + + /* Make sure mondo block is 64byte aligned */ + p = kzalloc(127, GFP_KERNEL); + if (!p) { + prom_printf("SUN4V: Error, cannot allocate mondo block.\n"); + prom_halt(); + } + mondo = (void *)(((unsigned long)p + 63) & ~0x3f); + tb->cpu_mondo_block_pa = __pa(mondo); + + page = get_zeroed_page(GFP_KERNEL); + if (!page) { + prom_printf("SUN4V: Error, cannot allocate cpu list page.\n"); + prom_halt(); + } + + tb->cpu_list_pa = __pa(page); +#endif +} + +/* Allocate mondo and error queues for all possible cpus. */ +static void __init sun4v_init_mondo_queues(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct trap_per_cpu *tb = &trap_block[cpu]; + + alloc_one_queue(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask); + alloc_one_queue(&tb->dev_mondo_pa, tb->dev_mondo_qmask); + alloc_one_queue(&tb->resum_mondo_pa, tb->resum_qmask); + alloc_one_queue(&tb->resum_kernel_buf_pa, tb->resum_qmask); + alloc_one_queue(&tb->nonresum_mondo_pa, tb->nonresum_qmask); + alloc_one_queue(&tb->nonresum_kernel_buf_pa, + tb->nonresum_qmask); + } +} + +static void __init init_send_mondo_info(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct trap_per_cpu *tb = &trap_block[cpu]; + + init_cpu_send_mondo_info(tb); + } +} + +static struct irqaction timer_irq_action = { + .name = "timer", +}; + +static void __init irq_ivector_init(void) +{ + unsigned long size, order; + unsigned int ivecs; + + /* If we are doing cookie only VIRQs then we do not need the ivector + * table to process interrupts. + */ + if (sun4v_cookie_only_virqs()) + return; + + ivecs = size_nr_ivec(); + size = sizeof(struct ino_bucket) * ivecs; + order = get_order(size); + ivector_table = (struct ino_bucket *) + __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); + if (!ivector_table) { + prom_printf("Fatal error, cannot allocate ivector_table\n"); + prom_halt(); + } + __flush_dcache_range((unsigned long) ivector_table, + ((unsigned long) ivector_table) + size); + + ivector_table_pa = __pa(ivector_table); +} + +/* Only invoked on boot processor.*/ +void __init init_IRQ(void) +{ + irq_init_hv(); + irq_ivector_init(); + map_prom_timers(); + kill_prom_timer(); + + if (tlb_type == hypervisor) + sun4v_init_mondo_queues(); + + init_send_mondo_info(); + + if (tlb_type == hypervisor) { + /* Load up the boot cpu's entries. */ + sun4v_register_mondo_queues(hard_smp_processor_id()); + } + + /* We need to clear any IRQ's pending in the soft interrupt + * registers, a spurious one could be left around from the + * PROM timer which we just disabled. + */ + clear_softint(get_softint()); + + /* Now that ivector table is initialized, it is safe + * to receive IRQ vector traps. We will normally take + * one or two right now, in case some device PROM used + * to boot us wants to speak to us. We just ignore them. + */ + __asm__ __volatile__("rdpr %%pstate, %%g1\n\t" + "or %%g1, %0, %%g1\n\t" + "wrpr %%g1, 0x0, %%pstate" + : /* No outputs */ + : "i" (PSTATE_IE) + : "g1"); + + irq_to_desc(0)->action = &timer_irq_action; +} |