490 lines
12 KiB
C
490 lines
12 KiB
C
/*
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* Platform dependent support for SGI SN
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2000-2008 Silicon Graphics, Inc. All Rights Reserved.
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*/
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#include <linux/irq.h>
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#include <linux/spinlock.h>
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#include <linux/init.h>
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#include <linux/rculist.h>
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#include <linux/slab.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/arch.h>
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#include <asm/sn/intr.h>
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#include <asm/sn/pcibr_provider.h>
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#include <asm/sn/pcibus_provider_defs.h>
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#include <asm/sn/pcidev.h>
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#include <asm/sn/shub_mmr.h>
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#include <asm/sn/sn_sal.h>
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#include <asm/sn/sn_feature_sets.h>
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static void register_intr_pda(struct sn_irq_info *sn_irq_info);
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static void unregister_intr_pda(struct sn_irq_info *sn_irq_info);
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extern int sn_ioif_inited;
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struct list_head **sn_irq_lh;
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static DEFINE_SPINLOCK(sn_irq_info_lock); /* non-IRQ lock */
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u64 sn_intr_alloc(nasid_t local_nasid, int local_widget,
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struct sn_irq_info *sn_irq_info,
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int req_irq, nasid_t req_nasid,
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int req_slice)
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{
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struct ia64_sal_retval ret_stuff;
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ret_stuff.status = 0;
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ret_stuff.v0 = 0;
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SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
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(u64) SAL_INTR_ALLOC, (u64) local_nasid,
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(u64) local_widget, __pa(sn_irq_info), (u64) req_irq,
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(u64) req_nasid, (u64) req_slice);
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return ret_stuff.status;
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}
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void sn_intr_free(nasid_t local_nasid, int local_widget,
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struct sn_irq_info *sn_irq_info)
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{
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struct ia64_sal_retval ret_stuff;
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ret_stuff.status = 0;
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ret_stuff.v0 = 0;
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SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
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(u64) SAL_INTR_FREE, (u64) local_nasid,
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(u64) local_widget, (u64) sn_irq_info->irq_irq,
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(u64) sn_irq_info->irq_cookie, 0, 0);
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}
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u64 sn_intr_redirect(nasid_t local_nasid, int local_widget,
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struct sn_irq_info *sn_irq_info,
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nasid_t req_nasid, int req_slice)
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{
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struct ia64_sal_retval ret_stuff;
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ret_stuff.status = 0;
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ret_stuff.v0 = 0;
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SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
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(u64) SAL_INTR_REDIRECT, (u64) local_nasid,
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(u64) local_widget, __pa(sn_irq_info),
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(u64) req_nasid, (u64) req_slice, 0);
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return ret_stuff.status;
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}
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static unsigned int sn_startup_irq(struct irq_data *data)
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{
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return 0;
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}
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static void sn_shutdown_irq(struct irq_data *data)
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{
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}
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extern void ia64_mca_register_cpev(int);
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static void sn_disable_irq(struct irq_data *data)
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{
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if (data->irq == local_vector_to_irq(IA64_CPE_VECTOR))
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ia64_mca_register_cpev(0);
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}
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static void sn_enable_irq(struct irq_data *data)
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{
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if (data->irq == local_vector_to_irq(IA64_CPE_VECTOR))
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ia64_mca_register_cpev(data->irq);
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}
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static void sn_ack_irq(struct irq_data *data)
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{
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u64 event_occurred, mask;
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unsigned int irq = data->irq & 0xff;
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event_occurred = HUB_L((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED));
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mask = event_occurred & SH_ALL_INT_MASK;
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HUB_S((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS), mask);
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__set_bit(irq, (volatile void *)pda->sn_in_service_ivecs);
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irq_move_irq(data);
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}
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struct sn_irq_info *sn_retarget_vector(struct sn_irq_info *sn_irq_info,
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nasid_t nasid, int slice)
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{
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int vector;
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int cpuid;
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#ifdef CONFIG_SMP
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int cpuphys;
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#endif
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int64_t bridge;
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int local_widget, status;
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nasid_t local_nasid;
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struct sn_irq_info *new_irq_info;
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struct sn_pcibus_provider *pci_provider;
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bridge = (u64) sn_irq_info->irq_bridge;
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if (!bridge) {
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return NULL; /* irq is not a device interrupt */
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}
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local_nasid = NASID_GET(bridge);
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if (local_nasid & 1)
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local_widget = TIO_SWIN_WIDGETNUM(bridge);
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else
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local_widget = SWIN_WIDGETNUM(bridge);
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vector = sn_irq_info->irq_irq;
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/* Make use of SAL_INTR_REDIRECT if PROM supports it */
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status = sn_intr_redirect(local_nasid, local_widget, sn_irq_info, nasid, slice);
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if (!status) {
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new_irq_info = sn_irq_info;
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goto finish_up;
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}
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/*
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* PROM does not support SAL_INTR_REDIRECT, or it failed.
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* Revert to old method.
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*/
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new_irq_info = kmemdup(sn_irq_info, sizeof(struct sn_irq_info),
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GFP_ATOMIC);
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if (new_irq_info == NULL)
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return NULL;
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/* Free the old PROM new_irq_info structure */
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sn_intr_free(local_nasid, local_widget, new_irq_info);
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unregister_intr_pda(new_irq_info);
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/* allocate a new PROM new_irq_info struct */
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status = sn_intr_alloc(local_nasid, local_widget,
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new_irq_info, vector,
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nasid, slice);
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/* SAL call failed */
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if (status) {
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kfree(new_irq_info);
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return NULL;
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}
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register_intr_pda(new_irq_info);
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spin_lock(&sn_irq_info_lock);
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list_replace_rcu(&sn_irq_info->list, &new_irq_info->list);
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spin_unlock(&sn_irq_info_lock);
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kfree_rcu(sn_irq_info, rcu);
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finish_up:
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/* Update kernels new_irq_info with new target info */
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cpuid = nasid_slice_to_cpuid(new_irq_info->irq_nasid,
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new_irq_info->irq_slice);
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new_irq_info->irq_cpuid = cpuid;
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pci_provider = sn_pci_provider[new_irq_info->irq_bridge_type];
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/*
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* If this represents a line interrupt, target it. If it's
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* an msi (irq_int_bit < 0), it's already targeted.
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*/
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if (new_irq_info->irq_int_bit >= 0 &&
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pci_provider && pci_provider->target_interrupt)
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(pci_provider->target_interrupt)(new_irq_info);
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#ifdef CONFIG_SMP
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cpuphys = cpu_physical_id(cpuid);
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set_irq_affinity_info((vector & 0xff), cpuphys, 0);
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#endif
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return new_irq_info;
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}
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static int sn_set_affinity_irq(struct irq_data *data,
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const struct cpumask *mask, bool force)
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{
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struct sn_irq_info *sn_irq_info, *sn_irq_info_safe;
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unsigned int irq = data->irq;
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nasid_t nasid;
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int slice;
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nasid = cpuid_to_nasid(cpumask_first_and(mask, cpu_online_mask));
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slice = cpuid_to_slice(cpumask_first_and(mask, cpu_online_mask));
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list_for_each_entry_safe(sn_irq_info, sn_irq_info_safe,
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sn_irq_lh[irq], list)
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(void)sn_retarget_vector(sn_irq_info, nasid, slice);
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return 0;
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}
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#ifdef CONFIG_SMP
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void sn_set_err_irq_affinity(unsigned int irq)
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{
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/*
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* On systems which support CPU disabling (SHub2), all error interrupts
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* are targeted at the boot CPU.
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*/
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if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT))
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set_irq_affinity_info(irq, cpu_physical_id(0), 0);
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}
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#else
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void sn_set_err_irq_affinity(unsigned int irq) { }
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#endif
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static void
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sn_mask_irq(struct irq_data *data)
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{
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}
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static void
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sn_unmask_irq(struct irq_data *data)
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{
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}
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struct irq_chip irq_type_sn = {
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.name = "SN hub",
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.irq_startup = sn_startup_irq,
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.irq_shutdown = sn_shutdown_irq,
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.irq_enable = sn_enable_irq,
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.irq_disable = sn_disable_irq,
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.irq_ack = sn_ack_irq,
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.irq_mask = sn_mask_irq,
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.irq_unmask = sn_unmask_irq,
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.irq_set_affinity = sn_set_affinity_irq
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};
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ia64_vector sn_irq_to_vector(int irq)
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{
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if (irq >= IA64_NUM_VECTORS)
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return 0;
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return (ia64_vector)irq;
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}
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unsigned int sn_local_vector_to_irq(u8 vector)
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{
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return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));
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}
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void sn_irq_init(void)
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{
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int i;
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ia64_first_device_vector = IA64_SN2_FIRST_DEVICE_VECTOR;
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ia64_last_device_vector = IA64_SN2_LAST_DEVICE_VECTOR;
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for (i = 0; i < NR_IRQS; i++) {
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if (irq_get_chip(i) == &no_irq_chip)
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irq_set_chip(i, &irq_type_sn);
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}
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}
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static void register_intr_pda(struct sn_irq_info *sn_irq_info)
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{
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int irq = sn_irq_info->irq_irq;
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int cpu = sn_irq_info->irq_cpuid;
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if (pdacpu(cpu)->sn_last_irq < irq) {
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pdacpu(cpu)->sn_last_irq = irq;
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}
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if (pdacpu(cpu)->sn_first_irq == 0 || pdacpu(cpu)->sn_first_irq > irq)
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pdacpu(cpu)->sn_first_irq = irq;
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}
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static void unregister_intr_pda(struct sn_irq_info *sn_irq_info)
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{
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int irq = sn_irq_info->irq_irq;
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int cpu = sn_irq_info->irq_cpuid;
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struct sn_irq_info *tmp_irq_info;
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int i, foundmatch;
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rcu_read_lock();
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if (pdacpu(cpu)->sn_last_irq == irq) {
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foundmatch = 0;
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for (i = pdacpu(cpu)->sn_last_irq - 1;
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i && !foundmatch; i--) {
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list_for_each_entry_rcu(tmp_irq_info,
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sn_irq_lh[i],
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list) {
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if (tmp_irq_info->irq_cpuid == cpu) {
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foundmatch = 1;
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break;
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}
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}
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}
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pdacpu(cpu)->sn_last_irq = i;
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}
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if (pdacpu(cpu)->sn_first_irq == irq) {
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foundmatch = 0;
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for (i = pdacpu(cpu)->sn_first_irq + 1;
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i < NR_IRQS && !foundmatch; i++) {
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list_for_each_entry_rcu(tmp_irq_info,
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sn_irq_lh[i],
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list) {
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if (tmp_irq_info->irq_cpuid == cpu) {
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foundmatch = 1;
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break;
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}
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}
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}
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pdacpu(cpu)->sn_first_irq = ((i == NR_IRQS) ? 0 : i);
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}
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rcu_read_unlock();
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}
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void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
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{
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nasid_t nasid = sn_irq_info->irq_nasid;
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int slice = sn_irq_info->irq_slice;
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int cpu = nasid_slice_to_cpuid(nasid, slice);
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#ifdef CONFIG_SMP
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int cpuphys;
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#endif
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pci_dev_get(pci_dev);
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sn_irq_info->irq_cpuid = cpu;
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sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);
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/* link it into the sn_irq[irq] list */
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spin_lock(&sn_irq_info_lock);
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list_add_rcu(&sn_irq_info->list, sn_irq_lh[sn_irq_info->irq_irq]);
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reserve_irq_vector(sn_irq_info->irq_irq);
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if (sn_irq_info->irq_int_bit != -1)
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irq_set_handler(sn_irq_info->irq_irq, handle_level_irq);
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spin_unlock(&sn_irq_info_lock);
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register_intr_pda(sn_irq_info);
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#ifdef CONFIG_SMP
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cpuphys = cpu_physical_id(cpu);
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set_irq_affinity_info(sn_irq_info->irq_irq, cpuphys, 0);
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/*
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* Affinity was set by the PROM, prevent it from
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* being reset by the request_irq() path.
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*/
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irqd_mark_affinity_was_set(irq_get_irq_data(sn_irq_info->irq_irq));
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#endif
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}
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void sn_irq_unfixup(struct pci_dev *pci_dev)
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{
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struct sn_irq_info *sn_irq_info;
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/* Only cleanup IRQ stuff if this device has a host bus context */
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if (!SN_PCIDEV_BUSSOFT(pci_dev))
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return;
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sn_irq_info = SN_PCIDEV_INFO(pci_dev)->pdi_sn_irq_info;
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if (!sn_irq_info)
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return;
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if (!sn_irq_info->irq_irq) {
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kfree(sn_irq_info);
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return;
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}
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unregister_intr_pda(sn_irq_info);
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spin_lock(&sn_irq_info_lock);
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list_del_rcu(&sn_irq_info->list);
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spin_unlock(&sn_irq_info_lock);
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if (list_empty(sn_irq_lh[sn_irq_info->irq_irq]))
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free_irq_vector(sn_irq_info->irq_irq);
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kfree_rcu(sn_irq_info, rcu);
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pci_dev_put(pci_dev);
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}
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static inline void
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sn_call_force_intr_provider(struct sn_irq_info *sn_irq_info)
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{
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struct sn_pcibus_provider *pci_provider;
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pci_provider = sn_pci_provider[sn_irq_info->irq_bridge_type];
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/* Don't force an interrupt if the irq has been disabled */
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if (!irqd_irq_disabled(irq_get_irq_data(sn_irq_info->irq_irq)) &&
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pci_provider && pci_provider->force_interrupt)
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(*pci_provider->force_interrupt)(sn_irq_info);
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}
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/*
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* Check for lost interrupts. If the PIC int_status reg. says that
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* an interrupt has been sent, but not handled, and the interrupt
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* is not pending in either the cpu irr regs or in the soft irr regs,
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* and the interrupt is not in service, then the interrupt may have
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* been lost. Force an interrupt on that pin. It is possible that
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* the interrupt is in flight, so we may generate a spurious interrupt,
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* but we should never miss a real lost interrupt.
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*/
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static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
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{
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u64 regval;
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struct pcidev_info *pcidev_info;
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struct pcibus_info *pcibus_info;
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/*
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* Bridge types attached to TIO (anything but PIC) do not need this WAR
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* since they do not target Shub II interrupt registers. If that
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* ever changes, this check needs to accommodate.
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*/
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if (sn_irq_info->irq_bridge_type != PCIIO_ASIC_TYPE_PIC)
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return;
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pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
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if (!pcidev_info)
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return;
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pcibus_info =
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(struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
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pdi_pcibus_info;
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regval = pcireg_intr_status_get(pcibus_info);
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if (!ia64_get_irr(irq_to_vector(irq))) {
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if (!test_bit(irq, pda->sn_in_service_ivecs)) {
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regval &= 0xff;
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if (sn_irq_info->irq_int_bit & regval &
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sn_irq_info->irq_last_intr) {
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regval &= ~(sn_irq_info->irq_int_bit & regval);
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sn_call_force_intr_provider(sn_irq_info);
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}
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}
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}
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sn_irq_info->irq_last_intr = regval;
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}
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void sn_lb_int_war_check(void)
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{
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struct sn_irq_info *sn_irq_info;
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int i;
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if (!sn_ioif_inited || pda->sn_first_irq == 0)
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return;
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rcu_read_lock();
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for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
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list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[i], list) {
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sn_check_intr(i, sn_irq_info);
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}
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}
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rcu_read_unlock();
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}
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void __init sn_irq_lh_init(void)
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{
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int i;
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sn_irq_lh = kmalloc_array(NR_IRQS, sizeof(struct list_head *),
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GFP_KERNEL);
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if (!sn_irq_lh)
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panic("SN PCI INIT: Failed to allocate memory for PCI init\n");
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for (i = 0; i < NR_IRQS; i++) {
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|
sn_irq_lh[i] = kmalloc(sizeof(struct list_head), GFP_KERNEL);
|
|
if (!sn_irq_lh[i])
|
|
panic("SN PCI INIT: Failed IRQ memory allocation\n");
|
|
|
|
INIT_LIST_HEAD(sn_irq_lh[i]);
|
|
}
|
|
}
|