Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267511AbUIUIzw (ORCPT ); Tue, 21 Sep 2004 04:55:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267543AbUIUIyD (ORCPT ); Tue, 21 Sep 2004 04:54:03 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:51152 "EHLO fgwmail5.fujitsu.co.jp") by vger.kernel.org with ESMTP id S267538AbUIUIvE (ORCPT ); Tue, 21 Sep 2004 04:51:04 -0400 Date: Tue, 21 Sep 2004 17:52:54 +0900 From: Kenji Kaneshige Subject: [PATCH] PCI IRQ resource deallocation support [3/3] To: akpm@osdl.org, greg@kroah.com, len.brown@intel.com, tony.luck@intel.com, linux-kernel@vger.kernel.org, acpi-devel@lists.sourceforge.net, linux-ia64@vger.kernel.org Message-id: <414FEBE6.8050505@soft.fujitsu.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit X-Accept-Language: ja User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ja-JP; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12973 Lines: 343 This is an ia64 portion of IRQ resource deallocation. It implements pcibios_disable_device() and acpi_unregister_gsi() for ia64. o acpi_unregister_gsi() Summary of changes for implementing this interface: - Add new function iosapic_unregister_intr() into arch/ia64/kernel/iosapic.c. This function frees an interrupt vector and related data structures. - Add new function free_irq_vector() into arch/ia64/kernel/irq_ia64.c. This frees an unused vector. - Change assign_irq_vector() to be able to support free_irq_vector(). o pcibios_disable_device() This calls acpi_pci_irq_disable() to deallocate IRQ resources. Signed-off-by: Kenji Kaneshige --- linux-2.6.9-rc2-mm1-kanesige/arch/ia64/Kconfig | 9 + linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/acpi.c | 3 linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/iosapic.c | 82 +++++++++++++-- linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/irq.c | 9 + linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/irq_ia64.c | 27 ++++ linux-2.6.9-rc2-mm1-kanesige/arch/ia64/pci/pci.c | 3 linux-2.6.9-rc2-mm1-kanesige/include/asm-ia64/hw_irq.h | 2 linux-2.6.9-rc2-mm1-kanesige/include/asm-ia64/iosapic.h | 4 8 files changed, 124 insertions(+), 15 deletions(-) diff -puN arch/ia64/Kconfig~IRQ_deallocation_ia64 arch/ia64/Kconfig --- linux-2.6.9-rc2-mm1/arch/ia64/Kconfig~IRQ_deallocation_ia64 2004-09-21 15:24:28.251867327 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/arch/ia64/Kconfig 2004-09-21 15:24:28.271398701 +0900 @@ -500,6 +500,15 @@ config IA64_PALINFO To use this option, you have to ensure that the "/proc file system support" (CONFIG_PROC_FS) is enabled, too. +config IA64_DEALLOCATE_IRQ + bool "IRQ resource deallocation support (EXPERIMENTAL)" + depends on IOSAPIC && EXPERIMENTAL + default n + help + Say Y here to experiment with deallocating IRQ resources + dynamically. + Say N if you want to disable IRQ resource deallocation. + source "drivers/firmware/Kconfig" source "fs/Kconfig.binfmt" diff -puN arch/ia64/kernel/acpi.c~IRQ_deallocation_ia64 arch/ia64/kernel/acpi.c --- linux-2.6.9-rc2-mm1/arch/ia64/kernel/acpi.c~IRQ_deallocation_ia64 2004-09-21 15:24:28.259679877 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/acpi.c 2004-09-21 15:24:28.272375269 +0900 @@ -524,6 +524,9 @@ EXPORT_SYMBOL(acpi_register_gsi); void acpi_unregister_gsi (unsigned int irq) { +#ifdef CONFIG_IA64_DEALLOCATE_IRQ + iosapic_unregister_intr(irq); +#endif } EXPORT_SYMBOL(acpi_unregister_gsi); diff -puN arch/ia64/kernel/iosapic.c~IRQ_deallocation_ia64 arch/ia64/kernel/iosapic.c --- linux-2.6.9-rc2-mm1/arch/ia64/kernel/iosapic.c~IRQ_deallocation_ia64 2004-09-21 15:24:28.260656445 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/iosapic.c 2004-09-21 15:24:28.273351838 +0900 @@ -111,6 +111,7 @@ static struct iosapic_intr_info { unsigned char dmode : 3; /* delivery mode (see iosapic.h) */ unsigned char polarity: 1; /* interrupt polarity (see iosapic.h) */ unsigned char trigger : 1; /* trigger mode (see iosapic.h) */ + int refcnt; /* reference counter */ } iosapic_intr_info[IA64_NUM_VECTORS]; static struct iosapic { @@ -177,7 +178,7 @@ gsi_to_irq (unsigned int gsi) static void set_rte (unsigned int vector, unsigned int dest, int mask) { - unsigned long pol, trigger, dmode, flags; + unsigned long pol, trigger, dmode; u32 low32, high32; char *addr; int rte_index; @@ -218,13 +219,9 @@ set_rte (unsigned int vector, unsigned i /* dest contains both id and eid */ high32 = (dest << IOSAPIC_DEST_SHIFT); - spin_lock_irqsave(&iosapic_lock, flags); - { - iosapic_write(addr, IOSAPIC_RTE_HIGH(rte_index), high32); - iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); - iosapic_intr_info[vector].low32 = low32; - } - spin_unlock_irqrestore(&iosapic_lock, flags); + iosapic_write(addr, IOSAPIC_RTE_HIGH(rte_index), high32); + iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); + iosapic_intr_info[vector].low32 = low32; } static void @@ -475,6 +472,7 @@ register_intr (unsigned int gsi, int vec iosapic_intr_info[vector].addr = iosapic_address; iosapic_intr_info[vector].gsi_base = gsi_base; iosapic_intr_info[vector].trigger = trigger; + iosapic_intr_info[vector].refcnt++; if (trigger == IOSAPIC_EDGE) irq_type = &irq_type_iosapic_edge; @@ -576,6 +574,7 @@ iosapic_register_intr (unsigned int gsi, { vector = gsi_to_vector(gsi); if (vector > 0) { + iosapic_intr_info[vector].refcnt++; spin_unlock_irqrestore(&iosapic_lock, flags); return vector; } @@ -584,6 +583,8 @@ iosapic_register_intr (unsigned int gsi, dest = get_target_cpu(gsi, vector); register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, polarity, trigger); + + set_rte(vector, dest, 1); } spin_unlock_irqrestore(&iosapic_lock, flags); @@ -592,10 +593,73 @@ iosapic_register_intr (unsigned int gsi, (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), cpu_logical_id(dest), dest, vector); - set_rte(vector, dest, 1); return vector; } +#ifdef CONFIG_IA64_DEALLOCATE_IRQ +void +iosapic_unregister_intr (unsigned int irq) +{ + unsigned long flags; + irq_desc_t *idesc; + int rte_index; + unsigned int gsi; + unsigned long trigger, polarity; + ia64_vector vector = irq_to_vector(irq); + + idesc = irq_descp(irq); + spin_lock_irqsave(&idesc->lock, flags); + spin_lock(&iosapic_lock); + { + rte_index = iosapic_intr_info[vector].rte_index; + if (rte_index < 0) { + spin_unlock(&iosapic_lock); + spin_unlock_irqrestore(&idesc->lock, flags); + return; /* not an IOSAPIC interrupt */ + } + + if (--iosapic_intr_info[vector].refcnt > 0) { + spin_unlock(&iosapic_lock); + spin_unlock_irqrestore(&idesc->lock, flags); + return; + } + + /* + * If interrupt handlers still exists on the irq + * associated with the gsi, don't unregister the + * interrupt. + */ + if (unlikely(idesc->action)) { + iosapic_intr_info[vector].refcnt++; + spin_unlock_irqrestore(&idesc->lock, flags); + printk(KERN_WARNING "Cannot unregister GSI. IRQ %u is still in use.\n", irq); + return; + } + + /* Clear the interrupt controller descriptor. */ + idesc->handler = &no_irq_type; + + gsi = iosapic_intr_info[vector].gsi_base + rte_index; + trigger = iosapic_intr_info[vector].trigger; + polarity = iosapic_intr_info[vector].polarity; + + /* Clear the interrupt information. */ + memset(&iosapic_intr_info[vector], 0, sizeof(struct iosapic_intr_info)); + iosapic_intr_info[vector].rte_index = -1; /* mark as unused */ + } + spin_unlock(&iosapic_lock); + spin_unlock_irqrestore(&idesc->lock, flags); + + /* Free the interrupt vector */ + free_irq_vector(vector); + + printk(KERN_INFO "GSI %u (%s, %s) -> vector %d unregisterd.\n", + gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), + (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), + vector); +} +#endif /* CONFIG_IA64_DEALLOCATE_IRQ */ + /* * ACPI calls this when it finds an entry for a platform interrupt. * Note that the irq_base and IOSAPIC address must be set in iosapic_init(). diff -puN arch/ia64/kernel/irq.c~IRQ_deallocation_ia64 arch/ia64/kernel/irq.c --- linux-2.6.9-rc2-mm1/arch/ia64/kernel/irq.c~IRQ_deallocation_ia64 2004-09-21 15:24:28.262609583 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/irq.c 2004-09-21 15:24:28.273351838 +0900 @@ -879,8 +879,11 @@ int setup_irq(unsigned int irq, struct i struct irqaction *old, **p; irq_desc_t *desc = irq_descp(irq); - if (desc->handler == &no_irq_type) + spin_lock_irqsave(&desc->lock,flags); + if (desc->handler == &no_irq_type) { + spin_unlock_irqrestore(&desc->lock,flags); return -ENOSYS; + } /* * Some drivers like serial.c use request_irq() heavily, * so we have to be careful not to interfere with a @@ -906,7 +909,6 @@ int setup_irq(unsigned int irq, struct i /* * The following block of code has to be executed atomically */ - spin_lock_irqsave(&desc->lock,flags); p = &desc->action; if ((old = *p) != NULL) { /* Can't share interrupts unless both agree to */ @@ -1040,6 +1042,9 @@ void move_irq(int irq) irq_desc_t *desc = irq_descp(irq); int redir = test_bit(irq, pending_irq_redir); + if (unlikely(!desc->handler->set_affinity)) + return; + if (!cpus_empty(pending_irq_cpumask[irq])) { cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map); if (unlikely(!cpus_empty(tmp))) { diff -puN arch/ia64/kernel/irq_ia64.c~IRQ_deallocation_ia64 arch/ia64/kernel/irq_ia64.c --- linux-2.6.9-rc2-mm1/arch/ia64/kernel/irq_ia64.c~IRQ_deallocation_ia64 2004-09-21 15:24:28.264562720 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/arch/ia64/kernel/irq_ia64.c 2004-09-21 15:24:28.274328407 +0900 @@ -74,15 +74,34 @@ irq_exit (void) preempt_enable_no_resched(); } +static unsigned long ia64_vector_mask[BITS_TO_LONGS(IA64_NUM_DEVICE_VECTORS)]; + int assign_irq_vector (int irq) { - static int next_vector = IA64_FIRST_DEVICE_VECTOR; - - if (next_vector > IA64_LAST_DEVICE_VECTOR) + int pos, vector; + again: + pos = find_first_zero_bit(ia64_vector_mask, IA64_NUM_DEVICE_VECTORS); + vector = IA64_FIRST_DEVICE_VECTOR + pos; + if (vector > IA64_LAST_DEVICE_VECTOR) /* XXX could look for sharable vectors instead of panic'ing... */ panic("assign_irq_vector: out of interrupt vectors!"); - return next_vector++; + if (test_and_set_bit(pos, ia64_vector_mask)) + goto again; + return vector; +} + +void +free_irq_vector (int vector) +{ + int pos; + + if (vector < IA64_FIRST_DEVICE_VECTOR || vector > IA64_LAST_DEVICE_VECTOR) + return; + + pos = vector - IA64_FIRST_DEVICE_VECTOR; + if (!test_and_clear_bit(pos, ia64_vector_mask)) + printk(KERN_WARNING "%s: double free!\n", __FUNCTION__); } extern unsigned int do_IRQ(unsigned long irq, struct pt_regs *regs); diff -puN arch/ia64/pci/pci.c~IRQ_deallocation_ia64 arch/ia64/pci/pci.c --- linux-2.6.9-rc2-mm1/arch/ia64/pci/pci.c~IRQ_deallocation_ia64 2004-09-21 15:24:28.265539289 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/arch/ia64/pci/pci.c 2004-09-21 15:24:28.274328407 +0900 @@ -451,6 +451,9 @@ pcibios_enable_device (struct pci_dev *d void pcibios_disable_device (struct pci_dev *dev) { +#ifdef CONFIG_IA64_DEALLOCATE_IRQ + acpi_pci_irq_disable(dev); +#endif /* CONFIG_IA64_DEALLOCATE_IRQ */ } void diff -puN include/asm-ia64/hw_irq.h~IRQ_deallocation_ia64 include/asm-ia64/hw_irq.h --- linux-2.6.9-rc2-mm1/include/asm-ia64/hw_irq.h~IRQ_deallocation_ia64 2004-09-21 15:24:28.267492426 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/include/asm-ia64/hw_irq.h 2004-09-21 15:24:28.275304975 +0900 @@ -50,6 +50,7 @@ typedef u8 ia64_vector; */ #define IA64_FIRST_DEVICE_VECTOR 0x30 #define IA64_LAST_DEVICE_VECTOR 0xe7 +#define IA64_NUM_DEVICE_VECTORS (IA64_LAST_DEVICE_VECTOR - IA64_FIRST_DEVICE_VECTOR + 1) #define IA64_MCA_RENDEZ_VECTOR 0xe8 /* MCA rendez interrupt */ #define IA64_PERFMON_VECTOR 0xee /* performanc monitor interrupt vector */ @@ -83,6 +84,7 @@ extern unsigned long ipi_base_addr; extern struct hw_interrupt_type irq_type_ia64_lsapic; /* CPU-internal interrupt controller */ extern int assign_irq_vector (int irq); /* allocate a free vector */ +extern void free_irq_vector (int vector); extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect); extern void register_percpu_irq (ia64_vector vec, struct irqaction *action); diff -puN include/asm-ia64/iosapic.h~IRQ_deallocation_ia64 include/asm-ia64/iosapic.h --- linux-2.6.9-rc2-mm1/include/asm-ia64/iosapic.h~IRQ_deallocation_ia64 2004-09-21 15:24:28.269445563 +0900 +++ linux-2.6.9-rc2-mm1-kanesige/include/asm-ia64/iosapic.h 2004-09-21 15:24:28.275304975 +0900 @@ -78,6 +78,9 @@ extern int gsi_to_irq (unsigned int gsi) extern void iosapic_enable_intr (unsigned int vector); extern int iosapic_register_intr (unsigned int gsi, unsigned long polarity, unsigned long trigger); +#ifdef CONFIG_IA64_DEALLOCATE_IRQ +extern void iosapic_unregister_intr (unsigned int irq); +#endif extern void __init iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi, unsigned long polarity, unsigned long trigger); @@ -97,6 +100,7 @@ extern void __init map_iosapic_to_node ( #define iosapic_system_init(pcat_compat) do { } while (0) #define iosapic_init(address,gsi_base) do { } while (0) #define iosapic_register_intr(gsi,polarity,trigger) (gsi) +#define iosapic_unregister_intr(irq) do { } while (0) #define iosapic_override_isa_irq(isa_irq,gsi,polarity,trigger) do { } while (0) #define iosapic_register_platform_intr(type,gsi,pmi,eid,id, \ polarity,trigger) (gsi) _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/