diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/hvcall.h | 13 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/xive.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/hotplug-cpu.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/kexec.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/setup.c | 8 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/smp.c | 27 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/xive/Kconfig | 5 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/xive/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/xive/common.c | 13 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/xive/spapr.c | 618 |
11 files changed, 698 insertions, 8 deletions
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h index 57d38b504ff7..3d34dc0869f6 100644 --- a/arch/powerpc/include/asm/hvcall.h +++ b/arch/powerpc/include/asm/hvcall.h @@ -280,7 +280,18 @@ #define H_RESIZE_HPT_COMMIT 0x370 #define H_REGISTER_PROC_TBL 0x37C #define H_SIGNAL_SYS_RESET 0x380 -#define MAX_HCALL_OPCODE H_SIGNAL_SYS_RESET +#define H_INT_GET_SOURCE_INFO 0x3A8 +#define H_INT_SET_SOURCE_CONFIG 0x3AC +#define H_INT_GET_SOURCE_CONFIG 0x3B0 +#define H_INT_GET_QUEUE_INFO 0x3B4 +#define H_INT_SET_QUEUE_CONFIG 0x3B8 +#define H_INT_GET_QUEUE_CONFIG 0x3BC +#define H_INT_SET_OS_REPORTING_LINE 0x3C0 +#define H_INT_GET_OS_REPORTING_LINE 0x3C4 +#define H_INT_ESB 0x3C8 +#define H_INT_SYNC 0x3CC +#define H_INT_RESET 0x3D0 +#define MAX_HCALL_OPCODE H_INT_RESET /* H_VIOCTL functions */ #define H_GET_VIOA_DUMP_SIZE 0x01 diff --git a/arch/powerpc/include/asm/xive.h b/arch/powerpc/include/asm/xive.h index c23ff4389ca2..473f133a8555 100644 --- a/arch/powerpc/include/asm/xive.h +++ b/arch/powerpc/include/asm/xive.h @@ -110,11 +110,13 @@ extern bool __xive_enabled; static inline bool xive_enabled(void) { return __xive_enabled; } +extern bool xive_spapr_init(void); extern bool xive_native_init(void); extern void xive_smp_probe(void); extern int xive_smp_prepare_cpu(unsigned int cpu); extern void xive_smp_setup_cpu(void); extern void xive_smp_disable_cpu(void); +extern void xive_teardown_cpu(void); extern void xive_kexec_teardown_cpu(int secondary); extern void xive_shutdown(void); extern void xive_flush_interrupt(void); @@ -147,6 +149,7 @@ extern int xive_native_get_vp_info(u32 vp_id, u32 *out_cam_id, u32 *out_chip_id) static inline bool xive_enabled(void) { return false; } +static inline bool xive_spapr_init(void) { return false; } static inline bool xive_native_init(void) { return false; } static inline void xive_smp_probe(void) { } extern inline int xive_smp_prepare_cpu(unsigned int cpu) { return -EINVAL; } diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index 3a6dfd14f64b..71dd69d9ec64 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -7,6 +7,7 @@ config PPC_PSERIES select PCI select PCI_MSI select PPC_XICS + select PPC_XIVE_SPAPR select PPC_ICP_NATIVE select PPC_ICP_HV select PPC_ICS_RTAS diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c index b357f1ae0b0a..fc0d8f97c03a 100644 --- a/arch/powerpc/platforms/pseries/hotplug-cpu.c +++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c @@ -34,6 +34,7 @@ #include <asm/machdep.h> #include <asm/vdso_datapage.h> #include <asm/xics.h> +#include <asm/xive.h> #include <asm/plpar_wrappers.h> #include "pseries.h" @@ -109,7 +110,10 @@ static void pseries_mach_cpu_die(void) local_irq_disable(); idle_task_exit(); - xics_teardown_cpu(); + if (xive_enabled()) + xive_teardown_cpu(); + else + xics_teardown_cpu(); if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) { set_cpu_current_state(cpu, CPU_STATE_INACTIVE); @@ -174,7 +178,10 @@ static int pseries_cpu_disable(void) boot_cpuid = cpumask_any(cpu_online_mask); /* FIXME: abstract this to not be platform specific later on */ - xics_migrate_irqs_away(); + if (xive_enabled()) + xive_smp_disable_cpu(); + else + xics_migrate_irqs_away(); return 0; } diff --git a/arch/powerpc/platforms/pseries/kexec.c b/arch/powerpc/platforms/pseries/kexec.c index 6681ac97fb18..eeb13429d685 100644 --- a/arch/powerpc/platforms/pseries/kexec.c +++ b/arch/powerpc/platforms/pseries/kexec.c @@ -15,6 +15,7 @@ #include <asm/firmware.h> #include <asm/kexec.h> #include <asm/xics.h> +#include <asm/xive.h> #include <asm/smp.h> #include <asm/plpar_wrappers.h> @@ -51,5 +52,8 @@ void pseries_kexec_cpu_down(int crash_shutdown, int secondary) } } - xics_kexec_teardown_cpu(secondary); + if (xive_enabled()) + xive_kexec_teardown_cpu(secondary); + else + xics_kexec_teardown_cpu(secondary); } diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index b5b650910cf5..5f1beb8367ac 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -57,6 +57,7 @@ #include <asm/nvram.h> #include <asm/pmc.h> #include <asm/xics.h> +#include <asm/xive.h> #include <asm/ppc-pci.h> #include <asm/i8259.h> #include <asm/udbg.h> @@ -176,8 +177,11 @@ static void __init pseries_setup_i8259_cascade(void) static void __init pseries_init_irq(void) { - xics_init(); - pseries_setup_i8259_cascade(); + /* Try using a XIVE if available, otherwise use a XICS */ + if (!xive_spapr_init()) { + xics_init(); + pseries_setup_i8259_cascade(); + } } static void pseries_lpar_enable_pmcs(void) diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c index 24785f63fb40..2e184829e5d4 100644 --- a/arch/powerpc/platforms/pseries/smp.c +++ b/arch/powerpc/platforms/pseries/smp.c @@ -41,6 +41,7 @@ #include <asm/vdso_datapage.h> #include <asm/cputhreads.h> #include <asm/xics.h> +#include <asm/xive.h> #include <asm/dbell.h> #include <asm/plpar_wrappers.h> #include <asm/code-patching.h> @@ -136,7 +137,9 @@ out: static void smp_setup_cpu(int cpu) { - if (cpu != boot_cpuid) + if (xive_enabled()) + xive_smp_setup_cpu(); + else if (cpu != boot_cpuid) xics_setup_cpu(); if (firmware_has_feature(FW_FEATURE_SPLPAR)) @@ -181,6 +184,13 @@ static int smp_pSeries_kick_cpu(int nr) return 0; } +static int pseries_smp_prepare_cpu(int cpu) +{ + if (xive_enabled()) + return xive_smp_prepare_cpu(cpu); + return 0; +} + static void smp_pseries_cause_ipi(int cpu) { /* POWER9 should not use this handler */ @@ -211,7 +221,7 @@ static int pseries_cause_nmi_ipi(int cpu) return 0; } -static __init void pSeries_smp_probe(void) +static __init void pSeries_smp_probe_xics(void) { xics_smp_probe(); @@ -221,11 +231,24 @@ static __init void pSeries_smp_probe(void) smp_ops->cause_ipi = icp_ops->cause_ipi; } +static __init void pSeries_smp_probe(void) +{ + if (xive_enabled()) + /* + * Don't use P9 doorbells when XIVE is enabled. IPIs + * using MMIOs should be faster + */ + xive_smp_probe(); + else + pSeries_smp_probe_xics(); +} + static struct smp_ops_t pseries_smp_ops = { .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ .cause_ipi = NULL, /* Filled at runtime by pSeries_smp_probe() */ .cause_nmi_ipi = pseries_cause_nmi_ipi, .probe = pSeries_smp_probe, + .prepare_cpu = pseries_smp_prepare_cpu, .kick_cpu = smp_pSeries_kick_cpu, .setup_cpu = smp_setup_cpu, .cpu_bootable = smp_generic_cpu_bootable, diff --git a/arch/powerpc/sysdev/xive/Kconfig b/arch/powerpc/sysdev/xive/Kconfig index 12ccd7373d2f..3e3e25b5e30d 100644 --- a/arch/powerpc/sysdev/xive/Kconfig +++ b/arch/powerpc/sysdev/xive/Kconfig @@ -9,3 +9,8 @@ config PPC_XIVE_NATIVE default n select PPC_XIVE depends on PPC_POWERNV + +config PPC_XIVE_SPAPR + bool + default n + select PPC_XIVE diff --git a/arch/powerpc/sysdev/xive/Makefile b/arch/powerpc/sysdev/xive/Makefile index 3fab303fc169..536d6e5706e3 100644 --- a/arch/powerpc/sysdev/xive/Makefile +++ b/arch/powerpc/sysdev/xive/Makefile @@ -2,3 +2,4 @@ subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror obj-y += common.o obj-$(CONFIG_PPC_XIVE_NATIVE) += native.o +obj-$(CONFIG_PPC_XIVE_SPAPR) += spapr.o diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c index a30d6d12b92b..f1e0a3326d01 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -1372,6 +1372,19 @@ void xive_flush_interrupt(void) #endif /* CONFIG_SMP */ +void xive_teardown_cpu(void) +{ + struct xive_cpu *xc = __this_cpu_read(xive_cpu); + unsigned int cpu = smp_processor_id(); + + /* Set CPPR to 0 to disable flow of interrupts */ + xc->cppr = 0; + out_8(xive_tima + xive_tima_offset + TM_CPPR, 0); + + if (xive_ops->teardown_cpu) + xive_ops->teardown_cpu(cpu, xc); +} + void xive_kexec_teardown_cpu(int secondary) { struct xive_cpu *xc = __this_cpu_read(xive_cpu); diff --git a/arch/powerpc/sysdev/xive/spapr.c b/arch/powerpc/sysdev/xive/spapr.c new file mode 100644 index 000000000000..797bb0636ab7 --- /dev/null +++ b/arch/powerpc/sysdev/xive/spapr.c @@ -0,0 +1,618 @@ +/* + * Copyright 2016,2017 IBM Corporation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#define pr_fmt(fmt) "xive: " fmt + +#include <linux/types.h> +#include <linux/irq.h> +#include <linux/smp.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/of.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/cpumask.h> +#include <linux/mm.h> + +#include <asm/prom.h> +#include <asm/io.h> +#include <asm/smp.h> +#include <asm/irq.h> +#include <asm/errno.h> +#include <asm/xive.h> +#include <asm/xive-regs.h> +#include <asm/hvcall.h> + +#include "xive-internal.h" + +static u32 xive_queue_shift; + +struct xive_irq_bitmap { + unsigned long *bitmap; + unsigned int base; + unsigned int count; + spinlock_t lock; + struct list_head list; +}; + +static LIST_HEAD(xive_irq_bitmaps); + +static int xive_irq_bitmap_add(int base, int count) +{ + struct xive_irq_bitmap *xibm; + + xibm = kzalloc(sizeof(*xibm), GFP_ATOMIC); + if (!xibm) + return -ENOMEM; + + spin_lock_init(&xibm->lock); + xibm->base = base; + xibm->count = count; + xibm->bitmap = kzalloc(xibm->count, GFP_KERNEL); + list_add(&xibm->list, &xive_irq_bitmaps); + + pr_info("Using IRQ range [%x-%x]", xibm->base, + xibm->base + xibm->count - 1); + return 0; +} + +static int __xive_irq_bitmap_alloc(struct xive_irq_bitmap *xibm) +{ + int irq; + + irq = find_first_zero_bit(xibm->bitmap, xibm->count); + if (irq != xibm->count) { + set_bit(irq, xibm->bitmap); + irq += xibm->base; + } else { + irq = -ENOMEM; + } + + return irq; +} + +static int xive_irq_bitmap_alloc(void) +{ + struct xive_irq_bitmap *xibm; + unsigned long flags; + int irq = -ENOENT; + + list_for_each_entry(xibm, &xive_irq_bitmaps, list) { + spin_lock_irqsave(&xibm->lock, flags); + irq = __xive_irq_bitmap_alloc(xibm); + spin_unlock_irqrestore(&xibm->lock, flags); + if (irq >= 0) + break; + } + return irq; +} + +static void xive_irq_bitmap_free(int irq) +{ + unsigned long flags; + struct xive_irq_bitmap *xibm; + + list_for_each_entry(xibm, &xive_irq_bitmaps, list) { + if ((irq >= xibm->base) && (irq < xibm->base + xibm->count)) { + spin_lock_irqsave(&xibm->lock, flags); + clear_bit(irq - xibm->base, xibm->bitmap); + spin_unlock_irqrestore(&xibm->lock, flags); + break; + } + } +} + +static long plpar_int_get_source_info(unsigned long flags, + unsigned long lisn, + unsigned long *src_flags, + unsigned long *eoi_page, + unsigned long *trig_page, + unsigned long *esb_shift) +{ + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + long rc; + + rc = plpar_hcall(H_INT_GET_SOURCE_INFO, retbuf, flags, lisn); + if (rc) { + pr_err("H_INT_GET_SOURCE_INFO lisn=%ld failed %ld\n", lisn, rc); + return rc; + } + + *src_flags = retbuf[0]; + *eoi_page = retbuf[1]; + *trig_page = retbuf[2]; + *esb_shift = retbuf[3]; + + pr_devel("H_INT_GET_SOURCE_INFO flags=%lx eoi=%lx trig=%lx shift=%lx\n", + retbuf[0], retbuf[1], retbuf[2], retbuf[3]); + + return 0; +} + +#define XIVE_SRC_SET_EISN (1ull << (63 - 62)) +#define XIVE_SRC_MASK (1ull << (63 - 63)) /* unused */ + +static long plpar_int_set_source_config(unsigned long flags, + unsigned long lisn, + unsigned long target, + unsigned long prio, + unsigned long sw_irq) +{ + long rc; + + + pr_devel("H_INT_SET_SOURCE_CONFIG flags=%lx lisn=%lx target=%lx prio=%lx sw_irq=%lx\n", + flags, lisn, target, prio, sw_irq); + + + rc = plpar_hcall_norets(H_INT_SET_SOURCE_CONFIG, flags, lisn, + target, prio, sw_irq); + if (rc) { + pr_err("H_INT_SET_SOURCE_CONFIG lisn=%ld target=%lx prio=%lx failed %ld\n", + lisn, target, prio, rc); + return rc; + } + + return 0; +} + +static long plpar_int_get_queue_info(unsigned long flags, + unsigned long target, + unsigned long priority, + unsigned long *esn_page, + unsigned long *esn_size) +{ + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + long rc; + + rc = plpar_hcall(H_INT_GET_QUEUE_INFO, retbuf, flags, target, priority); + if (rc) { + pr_err("H_INT_GET_QUEUE_INFO cpu=%ld prio=%ld failed %ld\n", + target, priority, rc); + return rc; + } + + *esn_page = retbuf[0]; + *esn_size = retbuf[1]; + + pr_devel("H_INT_GET_QUEUE_INFO page=%lx size=%lx\n", + retbuf[0], retbuf[1]); + + return 0; +} + +#define XIVE_EQ_ALWAYS_NOTIFY (1ull << (63 - 63)) + +static long plpar_int_set_queue_config(unsigned long flags, + unsigned long target, + unsigned long priority, + unsigned long qpage, + unsigned long qsize) +{ + long rc; + + pr_devel("H_INT_SET_QUEUE_CONFIG flags=%lx target=%lx priority=%lx qpage=%lx qsize=%lx\n", + flags, target, priority, qpage, qsize); + + rc = plpar_hcall_norets(H_INT_SET_QUEUE_CONFIG, flags, target, + priority, qpage, qsize); + if (rc) { + pr_err("H_INT_SET_QUEUE_CONFIG cpu=%ld prio=%ld qpage=%lx returned %ld\n", + target, priority, qpage, rc); + return rc; + } + + return 0; +} + +static long plpar_int_sync(unsigned long flags, unsigned long lisn) +{ + long rc; + + rc = plpar_hcall_norets(H_INT_SYNC, flags, lisn); + if (rc) { + pr_err("H_INT_SYNC lisn=%ld returned %ld\n", lisn, rc); + return rc; + } + + return 0; +} + +#define XIVE_SRC_H_INT_ESB (1ull << (63 - 60)) /* TODO */ +#define XIVE_SRC_LSI (1ull << (63 - 61)) +#define XIVE_SRC_TRIGGER (1ull << (63 - 62)) +#define XIVE_SRC_STORE_EOI (1ull << (63 - 63)) + +static int xive_spapr_populate_irq_data(u32 hw_irq, struct xive_irq_data *data) +{ + long rc; + unsigned long flags; + unsigned long eoi_page; + unsigned long trig_page; + unsigned long esb_shift; + + memset(data, 0, sizeof(*data)); + + rc = plpar_int_get_source_info(0, hw_irq, &flags, &eoi_page, &trig_page, + &esb_shift); + if (rc) + return -EINVAL; + + if (flags & XIVE_SRC_STORE_EOI) + data->flags |= XIVE_IRQ_FLAG_STORE_EOI; + if (flags & XIVE_SRC_LSI) + data->flags |= XIVE_IRQ_FLAG_LSI; + data->eoi_page = eoi_page; + data->esb_shift = esb_shift; + data->trig_page = trig_page; + + /* + * No chip-id for the sPAPR backend. This has an impact how we + * pick a target. See xive_pick_irq_target(). + */ + data->src_chip = XIVE_INVALID_CHIP_ID; + + data->eoi_mmio = ioremap(data->eoi_page, 1u << data->esb_shift); + if (!data->eoi_mmio) { + pr_err("Failed to map EOI page for irq 0x%x\n", hw_irq); + return -ENOMEM; + } + + /* Full function page supports trigger */ + if (flags & XIVE_SRC_TRIGGER) { + data->trig_mmio = data->eoi_mmio; + return 0; + } + + data->trig_mmio = ioremap(data->trig_page, 1u << data->esb_shift); + if (!data->trig_mmio) { + pr_err("Failed to map trigger page for irq 0x%x\n", hw_irq); + return -ENOMEM; + } + return 0; +} + +static int xive_spapr_configure_irq(u32 hw_irq, u32 target, u8 prio, u32 sw_irq) +{ + long rc; + + rc = plpar_int_set_source_config(XIVE_SRC_SET_EISN, hw_irq, target, + prio, sw_irq); + + return rc == 0 ? 0 : -ENXIO; +} + +/* This can be called multiple time to change a queue configuration */ +static int xive_spapr_configure_queue(u32 target, struct xive_q *q, u8 prio, + __be32 *qpage, u32 order) +{ + s64 rc = 0; + unsigned long esn_page; + unsigned long esn_size; + u64 flags, qpage_phys; + + /* If there's an actual queue page, clean it */ + if (order) { + if (WARN_ON(!qpage)) + return -EINVAL; + qpage_phys = __pa(qpage); + } else { + qpage_phys = 0; + } + + /* Initialize the rest of the fields */ + q->msk = order ? ((1u << (order - 2)) - 1) : 0; + q->idx = 0; + q->toggle = 0; + + rc = plpar_int_get_queue_info(0, target, prio, &esn_page, &esn_size); + if (rc) { + pr_err("Error %lld getting queue info prio %d\n", rc, prio); + rc = -EIO; + goto fail; + } + + /* TODO: add support for the notification page */ + q->eoi_phys = esn_page; + + /* Default is to always notify */ + flags = XIVE_EQ_ALWAYS_NOTIFY; + + /* Configure and enable the queue in HW */ + rc = plpar_int_set_queue_config(flags, target, prio, qpage_phys, order); + if (rc) { + pr_err("Error %lld setting queue for prio %d\n", rc, prio); + rc = -EIO; + } else { + q->qpage = qpage; + } +fail: + return rc; +} + +static int xive_spapr_setup_queue(unsigned int cpu, struct xive_cpu *xc, + u8 prio) +{ + struct xive_q *q = &xc->queue[prio]; + __be32 *qpage; + + qpage = xive_queue_page_alloc(cpu, xive_queue_shift); + if (IS_ERR(qpage)) + return PTR_ERR(qpage); + + return xive_spapr_configure_queue(cpu, q, prio, qpage, + xive_queue_shift); +} + +static void xive_spapr_cleanup_queue(unsigned int cpu, struct xive_cpu *xc, + u8 prio) +{ + struct xive_q *q = &xc->queue[prio]; + unsigned int alloc_order; + long rc; + + rc = plpar_int_set_queue_config(0, cpu, prio, 0, 0); + if (rc) + pr_err("Error %ld setting queue for prio %d\n", rc, prio); + + alloc_order = xive_alloc_order(xive_queue_shift); + free_pages((unsigned long)q->qpage, alloc_order); + q->qpage = NULL; +} + +static bool xive_spapr_match(struct device_node *node) +{ + /* Ignore cascaded controllers for the moment */ + return 1; +} + +#ifdef CONFIG_SMP +static int xive_spapr_get_ipi(unsigned int cpu, struct xive_cpu *xc) +{ + int irq = xive_irq_bitmap_alloc(); + + if (irq < 0) { + pr_err("Failed to allocate IPI on CPU %d\n", cpu); + return -ENXIO; + } + + xc->hw_ipi = irq; + return 0; +} + +static void xive_spapr_put_ipi(unsigned int cpu, struct xive_cpu *xc) +{ + xive_irq_bitmap_free(xc->hw_ipi); +} +#endif /* CONFIG_SMP */ + +static void xive_spapr_shutdown(void) +{ + long rc; + + rc = plpar_hcall_norets(H_INT_RESET, 0); + if (rc) + pr_err("H_INT_RESET failed %ld\n", rc); +} + +/* + * Perform an "ack" cycle on the current thread. Grab the pending + * active priorities and update the CPPR to the most favored one. + */ +static void xive_spapr_update_pending(struct xive_cpu *xc) +{ + u8 nsr, cppr; + u16 ack; + + /* + * Perform the "Acknowledge O/S to Register" cycle. + * + * Let's speedup the access to the TIMA using the raw I/O + * accessor as we don't need the synchronisation routine of + * the higher level ones + */ + ack = be16_to_cpu(__raw_readw(xive_tima + TM_SPC_ACK_OS_REG)); + + /* Synchronize subsequent queue accesses */ + mb(); + + /* + * Grab the CPPR and the "NSR" field which indicates the source + * of the interrupt (if any) + */ + cppr = ack & 0xff; + nsr = ack >> 8; + + if (nsr & TM_QW1_NSR_EO) { + if (cppr == 0xff) + return; + /* Mark the priority pending */ + xc->pending_prio |= 1 << cppr; + + /* + * A new interrupt should never have a CPPR less favored + * than our current one. + */ + if (cppr >= xc->cppr) + pr_err("CPU %d odd ack CPPR, got %d at %d\n", + smp_processor_id(), cppr, xc->cppr); + + /* Update our idea of what the CPPR is */ + xc->cppr = cppr; + } +} + +static void xive_spapr_eoi(u32 hw_irq) +{ + /* Not used */; +} + +static void xive_spapr_setup_cpu(unsigned int cpu, struct xive_cpu *xc) +{ + /* Only some debug on the TIMA settings */ + pr_debug("(HW value: %08x %08x %08x)\n", + in_be32(xive_tima + TM_QW1_OS + TM_WORD0), + in_be32(xive_tima + TM_QW1_OS + TM_WORD1), + in_be32(xive_tima + TM_QW1_OS + TM_WORD2)); +} + +static void xive_spapr_teardown_cpu(unsigned int cpu, struct xive_cpu *xc) +{ + /* Nothing to do */; +} + +static void xive_spapr_sync_source(u32 hw_irq) +{ + /* Specs are unclear on what this is doing */ + plpar_int_sync(0, hw_irq); +} + +static const struct xive_ops xive_spapr_ops = { + .populate_irq_data = xive_spapr_populate_irq_data, + .configure_irq = xive_spapr_configure_irq, + .setup_queue = xive_spapr_setup_queue, + .cleanup_queue = xive_spapr_cleanup_queue, + .match = xive_spapr_match, + .shutdown = xive_spapr_shutdown, + .update_pending = xive_spapr_update_pending, + .eoi = xive_spapr_eoi, + .setup_cpu = xive_spapr_setup_cpu, + .teardown_cpu = xive_spapr_teardown_cpu, + .sync_source = xive_spapr_sync_source, +#ifdef CONFIG_SMP + .get_ipi = xive_spapr_get_ipi, + .put_ipi = xive_spapr_put_ipi, +#endif /* CONFIG_SMP */ + .name = "spapr", +}; + +/* + * get max priority from "/ibm,plat-res-int-priorities" + */ +static bool xive_get_max_prio(u8 *max_prio) +{ + struct device_node *rootdn; + const __be32 *reg; + u32 len; + int prio, found; + + rootdn = of_find_node_by_path("/"); + if (!rootdn) { + pr_err("not root node found !\n"); + return false; + } + + reg = of_get_property(rootdn, "ibm,plat-res-int-priorities", &len); + if (!reg) { + pr_err("Failed to read 'ibm,plat-res-int-priorities' property\n"); + return false; + } + + if (len % (2 * sizeof(u32)) != 0) { + pr_err("invalid 'ibm,plat-res-int-priorities' property\n"); + return false; + } + + /* HW supports priorities in the range [0-7] and 0xFF is a + * wildcard priority used to mask. We scan the ranges reserved + * by the hypervisor to find the lowest priority we can use. + */ + found = 0xFF; + for (prio = 0; prio < 8; prio++) { + int reserved = 0; + int i; + + for (i = 0; i < len / (2 * sizeof(u32)); i++) { + int base = be32_to_cpu(reg[2 * i]); + int range = be32_to_cpu(reg[2 * i + 1]); + + if (prio >= base && prio < base + range) + reserved++; + } + + if (!reserved) + found = prio; + } + + if (found == 0xFF) { + pr_err("no valid priority found in 'ibm,plat-res-int-priorities'\n"); + return false; + } + + *max_prio = found; + return true; +} + +bool xive_spapr_init(void) +{ + struct device_node *np; + struct resource r; + void __iomem *tima; + struct property *prop; + u8 max_prio; + u32 val; + u32 len; + const __be32 *reg; + int i; + + if (xive_cmdline_disabled) + return false; + + pr_devel("%s()\n", __func__); + np = of_find_compatible_node(NULL, NULL, "ibm,power-ivpe"); + if (!np) { + pr_devel("not found !\n"); + return false; + } + pr_devel("Found %s\n", np->full_name); + + /* Resource 1 is the OS ring TIMA */ + if (of_address_to_resource(np, 1, &r)) { + pr_err("Failed to get thread mgmnt area resource\n"); + return false; + } + tima = ioremap(r.start, resource_size(&r)); + if (!tima) { + pr_err("Failed to map thread mgmnt area\n"); + return false; + } + + if (!xive_get_max_prio(&max_prio)) + return false; + + /* Feed the IRQ number allocator with the ranges given in the DT */ + reg = of_get_property(np, "ibm,xive-lisn-ranges", &len); + if (!reg) { + pr_err("Failed to read 'ibm,xive-lisn-ranges' property\n"); + return false; + } + + if (len % (2 * sizeof(u32)) != 0) { + pr_err("invalid 'ibm,xive-lisn-ranges' property\n"); + return false; + } + + for (i = 0; i < len / (2 * sizeof(u32)); i++, reg += 2) + xive_irq_bitmap_add(be32_to_cpu(reg[0]), + be32_to_cpu(reg[1])); + + /* Iterate the EQ sizes and pick one */ + of_property_for_each_u32(np, "ibm,xive-eq-sizes", prop, reg, val) { + xive_queue_shift = val; + if (val == PAGE_SHIFT) + break; + } + + /* Initialize XIVE core with our backend */ + if (!xive_core_init(&xive_spapr_ops, tima, TM_QW1_OS, max_prio)) + return false; + + pr_info("Using %dkB queues\n", 1 << (xive_queue_shift - 10)); + return true; +} |