/* * Intel IO-APIC support for multi-Pentium hosts. * * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo * * Many thanks to Stig Venaas for trying out countless experimental * patches and reporting/debugging problems patiently! * * (c) 1999, Multiple IO-APIC support, developed by * Ken-ichi Yaku and * Hidemi Kishimoto , * further tested and cleaned up by Zach Brown * and Ingo Molnar * * Fixes * Maciej W. Rozycki : Bits for genuine 82489DX APICs; * thanks to Eric Gilmore * and Rolf G. Tews * for testing these extensively * Paul Diefenbaugh : Added full ACPI support */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Different to Linux: our implementation can be simpler. */ #define make_8259A_irq(irq) (io_apic_irqs &= ~(1<<(irq))) int (*ioapic_renumber_irq)(int ioapic, int irq); atomic_t irq_mis_count; /* Where if anywhere is the i8259 connect in external int mode */ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; static DEFINE_SPINLOCK(ioapic_lock); int skip_ioapic_setup; #ifndef sis_apic_bug /* * Is the SiS APIC rmw bug present? * -1 = don't know, 0 = no, 1 = yes */ int sis_apic_bug = -1; #endif /* * # of IRQ routing registers */ int __read_mostly nr_ioapic_registers[MAX_IO_APICS]; int __read_mostly nr_ioapics; int disable_timer_pin_1 __initdata; /* * Rough estimation of how many shared IRQs there are, can * be changed anytime. */ #define MAX_PLUS_SHARED_IRQS nr_irqs_gsi #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + nr_irqs_gsi) /* * This is performance-critical, we want to do it O(1) * * the indexing order of this array favors 1:1 mappings * between pins and IRQs. */ static struct irq_pin_list { int apic, pin; unsigned int next; } *irq_2_pin; static unsigned int irq_2_pin_free_entry; /* * The common case is 1:1 IRQ<->pin mappings. Sometimes there are * shared ISA-space IRQs, so we have to support them. We are super * fast in the common case, and fast for shared ISA-space IRQs. */ static void add_pin_to_irq(unsigned int irq, int apic, int pin) { struct irq_pin_list *entry = irq_2_pin + irq; while (entry->next) { BUG_ON((entry->apic == apic) && (entry->pin == pin)); entry = irq_2_pin + entry->next; } BUG_ON((entry->apic == apic) && (entry->pin == pin)); if (entry->pin != -1) { if (irq_2_pin_free_entry >= PIN_MAP_SIZE) panic("io_apic.c: whoops"); entry->next = irq_2_pin_free_entry; entry = irq_2_pin + entry->next; irq_2_pin_free_entry = entry->next; entry->next = 0; } entry->apic = apic; entry->pin = pin; } /* * Reroute an IRQ to a different pin. */ static void __init replace_pin_at_irq(unsigned int irq, int oldapic, int oldpin, int newapic, int newpin) { struct irq_pin_list *entry = irq_2_pin + irq; while (1) { if (entry->apic == oldapic && entry->pin == oldpin) { entry->apic = newapic; entry->pin = newpin; } if (!entry->next) break; entry = irq_2_pin + entry->next; } } static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable) { struct irq_pin_list *entry = irq_2_pin + irq; unsigned int pin, reg; for (;;) { pin = entry->pin; if (pin == -1) break; reg = io_apic_read(entry->apic, 0x10 + pin*2); reg &= ~disable; reg |= enable; io_apic_modify(entry->apic, 0x10 + pin*2, reg); if (!entry->next) break; entry = irq_2_pin + entry->next; } } /* mask = 1 */ static void __mask_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0x00010000, 0); } /* mask = 0 */ static void __unmask_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0, 0x00010000); } /* trigger = 0 */ static void __edge_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0, 0x00008000); } /* trigger = 1 */ static void __level_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0x00008000, 0); } static void mask_IO_APIC_irq (unsigned int irq) { unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); __mask_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); } static void unmask_IO_APIC_irq (unsigned int irq) { unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); __unmask_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); } static void __eoi_IO_APIC_irq(unsigned int irq) { struct irq_pin_list *entry = irq_2_pin + irq; unsigned int pin, vector = IO_APIC_VECTOR(irq); for (;;) { pin = entry->pin; if (pin == -1) break; io_apic_eoi(entry->apic, vector); if (!entry->next) break; entry = irq_2_pin + entry->next; } } static void eoi_IO_APIC_irq(unsigned int irq) { unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); __eoi_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); } #define clear_IO_APIC_pin(a,p) __clear_IO_APIC_pin(a,p,0) #define clear_IO_APIC_pin_raw(a,p) __clear_IO_APIC_pin(a,p,1) static void __clear_IO_APIC_pin(unsigned int apic, unsigned int pin, int raw) { unsigned int (*read)(unsigned int, unsigned int) = raw ? __io_apic_read : io_apic_read; void (*write)(unsigned int, unsigned int, unsigned int) = raw ? __io_apic_write : io_apic_write; struct IO_APIC_route_entry entry; unsigned long flags; /* Check delivery_mode to be sure we're not clearing an SMI pin */ spin_lock_irqsave(&ioapic_lock, flags); *(((int*)&entry) + 0) = (*read)(apic, 0x10 + 2 * pin); *(((int*)&entry) + 1) = (*read)(apic, 0x11 + 2 * pin); spin_unlock_irqrestore(&ioapic_lock, flags); if (entry.delivery_mode == dest_SMI) return; /* * Disable it in the IO-APIC irq-routing table: */ memset(&entry, 0, sizeof(entry)); entry.mask = 1; spin_lock_irqsave(&ioapic_lock, flags); (*write)(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0)); (*write)(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1)); spin_unlock_irqrestore(&ioapic_lock, flags); } static void clear_IO_APIC (void) { int apic, pin; for (apic = 0; apic < nr_ioapics; apic++) { for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { clear_IO_APIC_pin(apic, pin); clear_IO_APIC_pin_raw(apic, pin); } } } #ifdef CONFIG_SMP fastcall void smp_irq_move_cleanup_interrupt(struct cpu_user_regs *regs) { unsigned vector, me; struct cpu_user_regs *old_regs = set_irq_regs(regs); ack_APIC_irq(); irq_enter(); me = smp_processor_id(); for (vector = FIRST_DYNAMIC_VECTOR; vector < NR_VECTORS; vector++) { unsigned int irq; unsigned int irr; struct irq_desc *desc; struct irq_cfg *cfg; irq = __get_cpu_var(vector_irq)[vector]; if (irq == -1) continue; desc = irq_to_desc(irq); if (!desc) continue; cfg = desc->chip_data; spin_lock(&desc->lock); if (!cfg->move_cleanup_count) goto unlock; if (vector == cfg->vector && cpu_isset(me, cfg->domain)) goto unlock; irr = apic_read(APIC_IRR + (vector / 32 * 0x10)); /* * Check if the vector that needs to be cleanedup is * registered at the cpu's IRR. If so, then this is not * the best time to clean it up. Lets clean it up in the * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR * to myself. */ if (irr & (1 << (vector % 32))) { genapic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR); goto unlock; } __get_cpu_var(vector_irq)[vector] = -1; cfg->move_cleanup_count--; unlock: spin_unlock(&desc->lock); } irq_exit(); set_irq_regs(old_regs); } static void send_cleanup_vector(struct irq_cfg *cfg) { cpumask_t cleanup_mask; cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map); cfg->move_cleanup_count = cpus_weight(cleanup_mask); genapic->send_IPI_mask(&cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR); cfg->move_in_progress = 0; } void irq_complete_move(struct irq_desc **descp) { struct irq_desc *desc = *descp; struct irq_cfg *cfg = desc->chip_data; unsigned vector, me; if (likely(!cfg->move_in_progress)) return; vector = get_irq_regs()->entry_vector; me = smp_processor_id(); if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain)) send_cleanup_vector(cfg); } unsigned int set_desc_affinity(struct irq_desc *desc, cpumask_t mask) { struct irq_cfg *cfg; unsigned int irq; int ret; unsigned long flags; cpumask_t dest_mask; if (!cpus_intersects(mask, cpu_online_map)) return BAD_APICID; irq = desc->irq; cfg = desc->chip_data; local_irq_save(flags); lock_vector_lock(); ret = __assign_irq_vector(irq, cfg, mask); unlock_vector_lock(); local_irq_restore(flags); if (ret < 0) return BAD_APICID; cpus_copy(desc->affinity, mask); cpus_and(dest_mask, desc->affinity, cfg->domain); return cpu_mask_to_apicid(dest_mask); } static void set_ioapic_affinity_irq_desc(struct irq_desc *desc, const struct cpumask mask) { unsigned long flags; unsigned int dest; int pin, irq; struct irq_cfg *cfg; struct irq_pin_list *entry; irq = desc->irq; cfg = desc->chip_data; spin_lock_irqsave(&ioapic_lock, flags); dest = set_desc_affinity(desc, mask); if (dest != BAD_APICID) { if ( !x2apic_enabled ) dest = SET_APIC_LOGICAL_ID(dest); entry = irq_2_pin + irq; for (;;) { unsigned int data; pin = entry->pin; if (pin == -1) break; io_apic_write(entry->apic, 0x10 + 1 + pin*2, dest); data = io_apic_read(entry->apic, 0x10 + pin*2); data &= ~IO_APIC_REDIR_VECTOR_MASK; data |= cfg->vector & 0xFF; io_apic_modify(entry->apic, 0x10 + pin*2, data); if (!entry->next) break; entry = irq_2_pin + entry->next; } } spin_unlock_irqrestore(&ioapic_lock, flags); } static void set_ioapic_affinity_irq(unsigned int irq, const struct cpumask mask) { struct irq_desc *desc; desc = irq_to_desc(irq); set_ioapic_affinity_irq_desc(desc, mask); } #endif /* CONFIG_SMP */ /* * Find the IRQ entry number of a certain pin. */ static int find_irq_entry(int 
From a779a482fb9b9f8fcdf8b2519c789b4b9bb5dd05 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 7 Jul 2017 16:56:48 +0200
Subject: build: add a hack for removing non-essential module info

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 include/linux/module.h      | 13 ++++++++-----
 include/linux/moduleparam.h | 15 ++++++++++++---
 init/Kconfig                |  7 +++++++
 kernel/module.c             |  5 ++++-
 scripts/mod/modpost.c       | 12 ++++++++++++
 5 files changed, 43 insertions(+), 9 deletions(-)

--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -159,6 +159,7 @@ extern void cleanup_module(void);
 
 /* Generic info of form tag = "info" */
 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
+#define MODULE_INFO_STRIP(tag, info) __MODULE_INFO_STRIP(tag, tag, info)
 
 /* For userspace: you can also call me... */
 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
@@ -202,12 +203,12 @@ extern void cleanup_module(void);
  * Author(s), use "Name <email>" or just "Name", for multiple
  * authors use multiple MODULE_AUTHOR() statements/lines.
  */
-#define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
+#define MODULE_AUTHOR(_author) MODULE_INFO_STRIP(author, _author)
 
 /* What your module does. */
-#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
+#define MODULE_DESCRIPTION(_description) MODULE_INFO_STRIP(description, _description)
 
-#ifdef MODULE
+#if defined(MODULE) && !defined(CONFIG_MODULE_STRIPPED)
 /* Creates an alias so file2alias.c can find device table. */
 #define MODULE_DEVICE_TABLE(type, name)					\
 extern const typeof(name) __mod_##type##__##name##_device_table		\
@@ -234,7 +235,9 @@ extern const typeof(name) __mod_##type##
  */
 
 #if defined(MODULE) || !defined(CONFIG_SYSFS)
-#define MODULE_VERSION(_version) MODULE_INFO(version, _version)
+#define MODULE_VERSION(_version) MODULE_INFO_STRIP(version, _version)
+#elif defined(CONFIG_MODULE_STRIPPED)
+#define MODULE_VERSION(_version) __MODULE_INFO_DISABLED(version)
 #else
 #define MODULE_VERSION(_version)					\
 	static struct module_version_attribute ___modver_attr = {	\
@@ -256,7 +259,7 @@ extern const typeof(name) __mod_##type##
 /* Optional firmware file (or files) needed by the module
  * format is simply firmware file name.  Multiple firmware
  * files require multiple MODULE_FIRMWARE() specifiers */
-#define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
+#define MODULE_FIRMWARE(_firmware) MODULE_INFO_STRIP(firmware, _firmware)
 
 struct notifier_block;
 
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -16,6 +16,16 @@
 /* Chosen so that structs with an unsigned long line up. */
 #define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
 
+/* This struct is here for syntactic coherency, it is not used */
+#define __MODULE_INFO_DISABLED(name)					  \
+  struct __UNIQUE_ID(name) {}
+
+#ifdef CONFIG_MODULE_STRIPPED
+#define __MODULE_INFO_STRIP(tag, name, info) __MODULE_INFO_DISABLED(name)
+#else
+#define __MODULE_INFO_STRIP(tag, name, info) __MODULE_INFO(tag, name, info)
+#endif
+
 #ifdef MODULE
 #define __MODULE_INFO(tag, name, info)					  \
 static const char __UNIQUE_ID(name)[]					  \
@@ -23,8 +33,7 @@ static const char __UNIQUE_ID(name)[]
   = __stringify(tag) "=" info
 #else  /* !MODULE */
 /* This struct is here for syntactic coherency, it is not used */
-#define __MODULE_INFO(tag, name, info)					  \
-  struct __UNIQUE_ID(name) {}
+#define __MODULE_INFO(tag, name, info) __MODULE_INFO_DISABLED(name)
 #endif
 #define __MODULE_PARM_TYPE(name, _type)					  \
   __MODULE_INFO(parmtype, name##type, #name ":" _type)
@@ -32,7 +41,7 @@ static const char __UNIQUE_ID(name)[]
 /* One for each parameter, describing how to use it.  Some files do
    multiple of these per line, so can't just use MODULE_INFO. */
 #define MODULE_PARM_DESC(_parm, desc) \
-	__MODULE_INFO(parm, _parm, #_parm ":" desc)
+	__MODULE_INFO_STRIP(parm, _parm, #_parm ":" desc)
 
 struct kernel_param;
 
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2122,6 +2122,13 @@ config TRIM_UNUSED_KSYMS
 
 	  If unsure, or if you need to build out-of-tree modules, say N.
 
+config MODULE_STRIPPED
+	bool "Reduce module size"
+	depends on MODULES
+	help
+	  Remove module parameter descriptions, author info, version, aliases,
+	  device tables, etc.
+
 endif # MODULES
 
 config MODULES_TREE_LOOKUP
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2968,9 +2968,11 @@ static struct module *setup_load_info(st
 
 static int check_modinfo(struct module *mod, struct load_info *info, int flags)
 {
-	const char *modmagic = get_modinfo(info, "vermagic");
 	int err;
 
+#ifndef CONFIG_MODULE_STRIPPED
+	const char *modmagic = get_modinfo(info, "vermagic");
+
 	if (flags & MODULE_INIT_IGNORE_VERMAGIC)
 		modmagic = NULL;
 
@@ -2991,6 +2993,7 @@ static int check_modinfo(struct module *
 				mod->name);
 		add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
 	}
+#endif
 
 	check_modinfo_retpoline(mod, info);
 
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1965,7 +1965,9 @@ static void read_symbols(char *modname)
 		symname = remove_dot(info.strtab + sym->st_name);
 
 		handle_modversions(mod, &info, sym, symname);
+#ifndef CONFIG_MODULE_STRIPPED
 		handle_moddevtable(mod, &info, sym, symname);
+#endif
 	}
 	if (!is_vmlinux(modname) ||
 	     (is_vmlinux(modname) && vmlinux_section_warnings))
@@ -2109,7 +2111,9 @@ static void add_header(struct buffer *b,
 	buf_printf(b, "#include <linux/vermagic.h>\n");
 	buf_printf(b, "#include <linux/compiler.h>\n");
 	buf_printf(b, "\n");
+#ifndef CONFIG_MODULE_STRIPPED
 	buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
+#endif
 	buf_printf(b, "\n");
 	buf_printf(b, "__visible struct module __this_module\n");
 	buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
@@ -2126,24 +2130,30 @@ static void add_header(struct buffer *b,
 
 static void add_intree_flag(struct buffer *b, int is_intree)
 {
+#ifndef CONFIG_MODULE_STRIPPED
 	if (is_intree)
 		buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
+#endif
 }
 
 /* Cannot check for assembler */
 static void add_retpoline(struct buffer *b)
 {
+#ifndef CONFIG_MODULE_STRIPPED
 	buf_printf(b, "\n#ifdef RETPOLINE\n");
 	buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
 	buf_printf(b, "#endif\n");
+#endif
 }
 
 static void add_staging_flag(struct buffer *b, const char *name)
 {
+#ifndef CONFIG_MODULE_STRIPPED
 	static const char *staging_dir = "drivers/staging";
 
 	if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
 		buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
+#endif
 }
 
 /* In kernel, this size is defined in linux/module.h;
@@ -2247,11 +2257,13 @@ static void add_depends(struct buffer *b
 
 static void add_srcversion(struct buffer *b, struct module *mod)
 {
+#ifndef CONFIG_MODULE_STRIPPED
 	if (mod->srcversion[0]) {
 		buf_printf(b, "\n");
 		buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
 			   mod->srcversion);
 	}
+#endif
 }
 
 static void write_if_changed(struct buffer *b, const char *fname)
@@ -2486,7 +2498,9 @@ int main(int argc, char **argv)
 		add_staging_flag(&buf, mod->name);
 		err |= add_versions(&buf, mod);
 		add_depends(&buf, mod, modules);
+#ifndef CONFIG_MODULE_STRIPPED
 		add_moddevtable(&buf, mod);
+#endif
 		add_srcversion(&buf, mod);
 
 		sprintf(fname, "%s.mod.c", mod->name);
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-19 06:38:44 +0000
eg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */ (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */ (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */ (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */ (reg_01.bits.entries != 0x2E) && (reg_01.bits.entries != 0x3F) ) UNEXPECTED_IO_APIC(); printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ); printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version); if ( (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */ (reg_01.bits.version != 0x10) && /* oldest IO-APICs */ (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */ (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */ (reg_01.bits.version != 0x20) /* Intel P64H (82806 AA) */ ) UNEXPECTED_IO_APIC(); if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2) UNEXPECTED_IO_APIC(); /* * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02, * but the value of reg_02 is read as the previous read register * value, so ignore it if reg_02 == reg_01. */ if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) { printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw); printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration); if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2) UNEXPECTED_IO_APIC(); } /* * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02 * or reg_03, but the value of reg_0[23] is read as the previous read * register value, so ignore it if reg_03 == reg_0[12]. */ if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw && reg_03.raw != reg_01.raw) { printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw); printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT); if (reg_03.bits.__reserved_1) UNEXPECTED_IO_APIC(); } printk(KERN_DEBUG ".... IRQ redirection table:\n"); printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol" " Stat Dest Deli Vect: \n"); for (i = 0; i <= reg_01.bits.entries; i++) { struct IO_APIC_route_entry entry; spin_lock_irqsave(&ioapic_lock, flags); *(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2); *(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2); spin_unlock_irqrestore(&ioapic_lock, flags); printk(KERN_DEBUG " %02x %03X %02X ", i, entry.dest.logical.logical_dest, entry.dest.physical.physical_dest ); printk("%1d %1d %1d %1d %1d %1d %1d %02X\n", entry.mask, entry.trigger, entry.irr, entry.polarity, entry.delivery_status, entry.dest_mode, entry.delivery_mode, entry.vector ); } } printk(KERN_INFO "Using vector-based indexing\n"); printk(KERN_DEBUG "IRQ to pin mappings:\n"); for (i = 0; i < nr_irqs_gsi; i++) { struct irq_pin_list *entry = irq_2_pin + i; if (entry->pin < 0) continue; printk(KERN_DEBUG "IRQ%d ", IO_APIC_VECTOR(i)); for (;;) { printk("-> %d:%d", entry->apic, entry->pin); if (!entry->next) break; entry = irq_2_pin + entry->next; } printk("\n"); } printk(KERN_INFO ".................................... done.\n"); return; } void print_IO_APIC(void) { if (apic_verbosity != APIC_QUIET) __print_IO_APIC(); } static void _print_IO_APIC_keyhandler(unsigned char key) { __print_IO_APIC(); } static struct keyhandler print_IO_APIC_keyhandler = { .diagnostic = 1, .u.fn = _print_IO_APIC_keyhandler, .desc = "print ioapic info" }; static void __init enable_IO_APIC(void) { int i8259_apic, i8259_pin; int i, apic; unsigned long flags; /* Initialise dynamic irq_2_pin free list. */ irq_2_pin = xmalloc_array(struct irq_pin_list, PIN_MAP_SIZE); memset(irq_2_pin, 0, PIN_MAP_SIZE * sizeof(*irq_2_pin)); for (i = 0; i < PIN_MAP_SIZE; i++) irq_2_pin[i].pin = -1; for (i = irq_2_pin_free_entry = nr_irqs_gsi; i < PIN_MAP_SIZE; i++) irq_2_pin[i].next = i + 1; for(apic = 0; apic < nr_ioapics; apic++) { int pin; /* See if any of the pins is in ExtINT mode */ for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { struct IO_APIC_route_entry entry; spin_lock_irqsave(&ioapic_lock, flags); *(((int *)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin); *(((int *)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin); spin_unlock_irqrestore(&ioapic_lock, flags); /* If the interrupt line is enabled and in ExtInt mode * I have found the pin where the i8259 is connected. */ if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) { ioapic_i8259.apic = apic; ioapic_i8259.pin = pin; goto found_i8259; } } } found_i8259: /* Look to see what if the MP table has reported the ExtINT */ /* If we could not find the appropriate pin by looking at the ioapic * the i8259 probably is not connected the ioapic but give the * mptable a chance anyway. */ i8259_pin = find_isa_irq_pin(0, mp_ExtINT); i8259_apic = find_isa_irq_apic(0, mp_ExtINT); /* Trust the MP table if nothing is setup in the hardware */ if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) { printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n"); ioapic_i8259.pin = i8259_pin; ioapic_i8259.apic = i8259_apic; } /* Complain if the MP table and the hardware disagree */ if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) && (i8259_pin >= 0) && (ioapic_i8259.pin >= 0)) { printk(KERN_WARNING "ExtINT in hardware and MP table differ\n"); } /* * Do not trust the IO-APIC being empty at bootup */ clear_IO_APIC(); } /* * Not an __init, needed by the reboot code */ void disable_IO_APIC(void) { /* * Clear the IO-APIC before rebooting: */ clear_IO_APIC(); /* * If the i8259 is routed through an IOAPIC * Put that IOAPIC in virtual wire mode * so legacy interrupts can be delivered. */ if (ioapic_i8259.pin != -1) { struct IO_APIC_route_entry entry; unsigned long flags; memset(&entry, 0, sizeof(entry)); entry.mask = 0; /* Enabled */ entry.trigger = 0; /* Edge */ entry.irr = 0; entry.polarity = 0; /* High */ entry.delivery_status = 0; entry.dest_mode = 0; /* Physical */ entry.delivery_mode = dest_ExtINT; /* ExtInt */ entry.vector = 0; SET_DEST(entry.dest.dest32, entry.dest.physical.physical_dest, get_apic_id()); /* * Add it to the IO-APIC irq-routing table: */ spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(ioapic_i8259.apic, 0x11+2*ioapic_i8259.pin, *(((int *)&entry)+1)); io_apic_write(ioapic_i8259.apic, 0x10+2*ioapic_i8259.pin, *(((int *)&entry)+0)); spin_unlock_irqrestore(&ioapic_lock, flags); } disconnect_bsp_APIC(ioapic_i8259.pin != -1); } /* * function to set the IO-APIC physical IDs based on the * values stored in the MPC table. * * by Matt Domsch Tue Dec 21 12:25:05 CST 1999 */ #ifndef CONFIG_X86_NUMAQ static void __init setup_ioapic_ids_from_mpc(void) { union IO_APIC_reg_00 reg_00; physid_mask_t phys_id_present_map; int apic; int i; unsigned char old_id; unsigned long flags; /* * Don't check I/O APIC IDs for xAPIC systems. They have * no meaning without the serial APIC bus. */ if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) || APIC_XAPIC(apic_version[boot_cpu_physical_apicid])) return; /* * This is broken; anything with a real cpu count has to * circumvent this idiocy regardless. */ phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map); /* * Set the IOAPIC ID to the value stored in the MPC table. */ for (apic = 0; apic < nr_ioapics; apic++) { /* Read the register 0 value */ spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(apic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); old_id = mp_ioapics[apic].mpc_apicid; if (mp_ioapics[apic].mpc_apicid >= get_physical_broadcast()) { printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n", apic, mp_ioapics[apic].mpc_apicid); printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n", reg_00.bits.ID); mp_ioapics[apic].mpc_apicid = reg_00.bits.ID; } /* * Sanity check, is the ID really free? Every APIC in a * system must have a unique ID or we get lots of nice * 'stuck on smp_invalidate_needed IPI wait' messages. */ if (check_apicid_used(phys_id_present_map, mp_ioapics[apic].mpc_apicid)) { printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n", apic, mp_ioapics[apic].mpc_apicid); for (i = 0; i < get_physical_broadcast(); i++) if (!physid_isset(i, phys_id_present_map)) break; if (i >= get_physical_broadcast()) panic("Max APIC ID exceeded!\n"); printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n", i); physid_set(i, phys_id_present_map); mp_ioapics[apic].mpc_apicid = i; } else { physid_mask_t tmp; tmp = apicid_to_cpu_present(mp_ioapics[apic].mpc_apicid); apic_printk(APIC_VERBOSE, "Setting %d in the " "phys_id_present_map\n", mp_ioapics[apic].mpc_apicid); physids_or(phys_id_present_map, phys_id_present_map, tmp); } /* * We need to adjust the IRQ routing table * if the ID changed. */ if (old_id != mp_ioapics[apic].mpc_apicid) for (i = 0; i < mp_irq_entries; i++) if (mp_irqs[i].mpc_dstapic == old_id) mp_irqs[i].mpc_dstapic = mp_ioapics[apic].mpc_apicid; /* * Read the right value from the MPC table and * write it into the ID register. */ apic_printk(APIC_VERBOSE, KERN_INFO "...changing IO-APIC physical APIC ID to %d ...", mp_ioapics[apic].mpc_apicid); reg_00.bits.ID = mp_ioapics[apic].mpc_apicid; spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(apic, 0, reg_00.raw); spin_unlock_irqrestore(&ioapic_lock, flags); /* * Sanity check */ spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(apic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid) printk("could not set ID!\n"); else apic_printk(APIC_VERBOSE, " ok.\n"); } } #else static void __init setup_ioapic_ids_from_mpc(void) { } #endif /* * There is a nasty bug in some older SMP boards, their mptable lies * about the timer IRQ. We do the following to work around the situation: * * - timer IRQ defaults to IO-APIC IRQ * - if this function detects that timer IRQs are defunct, then we fall * back to ISA timer IRQs */ static int __init timer_irq_works(void) { extern unsigned long pit0_ticks; unsigned long t1, flags; t1 = pit0_ticks; mb(); local_save_flags(flags); local_irq_enable(); /* Let ten ticks pass... */ mdelay((10 * 1000) / HZ); local_irq_restore(flags); /* * Expect a few ticks at least, to be sure some possible * glue logic does not lock up after one or two first * ticks in a non-ExtINT mode. Also the local APIC * might have cached one ExtINT interrupt. Finally, at * least one tick may be lost due to delays. */ mb(); if (pit0_ticks - t1 > 4) return 1; return 0; } /* * In the SMP+IOAPIC case it might happen that there are an unspecified * number of pending IRQ events unhandled. These cases are very rare, * so we 'resend' these IRQs via IPIs, to the same CPU. It's much * better to do it this way as thus we do not have to be aware of * 'pending' interrupts in the IRQ path, except at this point. */ /* * Edge triggered needs to resend any interrupt * that was delayed but this is now handled in the device * independent code. */ /* * Starting up a edge-triggered IO-APIC interrupt is * nasty - we need to make sure that we get the edge. * If it is already asserted for some reason, we need * return 1 to indicate that is was pending. * * This is not complete - we should be able to fake * an edge even if it isn't on the 8259A... */ static unsigned int startup_edge_ioapic_irq(unsigned int irq) { int was_pending = 0; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); if (platform_legacy_irq(irq)) { disable_8259A_irq(irq); if (i8259A_irq_pending(irq)) was_pending = 1; } __unmask_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); return was_pending; } /* * Once we have recorded IRQ_PENDING already, we can mask the * interrupt for real. This prevents IRQ storms from unhandled * devices. */ static void ack_edge_ioapic_irq(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); irq_complete_move(&desc); move_native_irq(irq); if ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == (IRQ_PENDING | IRQ_DISABLED)) mask_IO_APIC_irq(irq); ack_APIC_irq(); } /* * Level triggered interrupts can just be masked, * and shutting down and starting up the interrupt * is the same as enabling and disabling them -- except * with a startup need to return a "was pending" value. * * Level triggered interrupts are special because we * do not touch any IO-APIC register while handling * them. We ack the APIC in the end-IRQ handler, not * in the start-IRQ-handler. Protection against reentrance * from the same interrupt is still provided, both by the * generic IRQ layer and by the fact that an unacked local * APIC does not accept IRQs. */ static unsigned int startup_level_ioapic_irq (unsigned int irq) { unmask_IO_APIC_irq(irq); return 0; /* don't check for pending */ } int __read_mostly ioapic_ack_new = 1; static void setup_ioapic_ack(char *s) { if ( !strcmp(s, "old") ) ioapic_ack_new = 0; else if ( !strcmp(s, "new") ) ioapic_ack_new = 1; else printk("Unknown ioapic_ack value specified: '%s'\n", s); } custom_param("ioapic_ack", setup_ioapic_ack); static bool_t io_apic_level_ack_pending(unsigned int irq) { struct irq_pin_list *entry; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); entry = &irq_2_pin[irq]; for (;;) { unsigned int reg; int pin; if (!entry) break; pin = entry->pin; if (pin == -1) continue; reg = io_apic_read(entry->apic, 0x10 + pin*2); /* Is the remote IRR bit set? */ if (reg & IO_APIC_REDIR_REMOTE_IRR) { spin_unlock_irqrestore(&ioapic_lock, flags); return 1; } if (!entry->next) break; entry = irq_2_pin + entry->next; } spin_unlock_irqrestore(&ioapic_lock, flags); return 0; } static void mask_and_ack_level_ioapic_irq (unsigned int irq) { unsigned long v; int i; struct irq_desc *desc = irq_to_desc(irq); irq_complete_move(&desc); if ( ioapic_ack_new ) return; if ( !directed_eoi_enabled ) mask_IO_APIC_irq(irq); /* * It appears there is an erratum which affects at least version 0x11 * of I/O APIC (that's the 82093AA and cores integrated into various * chipsets). Under certain conditions a level-triggered interrupt is * erroneously delivered as edge-triggered one but the respective IRR * bit gets set nevertheless. As a result the I/O unit expects an EOI * message but it will never arrive and further interrupts are blocked * from the source. The exact reason is so far unknown, but the * phenomenon was observed when two consecutive interrupt requests * from a given source get delivered to the same CPU and the source is * temporarily disabled in between. * * A workaround is to simulate an EOI message manually. We achieve it * by setting the trigger mode to edge and then to level when the edge * trigger mode gets detected in the TMR of a local APIC for a * level-triggered interrupt. We mask the source for the time of the * operation to prevent an edge-triggered interrupt escaping meanwhile. * The idea is from Manfred Spraul. --macro */ i = IO_APIC_VECTOR(irq); v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1)); ack_APIC_irq(); if ((irq_desc[irq].status & IRQ_MOVE_PENDING) && !io_apic_level_ack_pending(irq)) move_native_irq(irq); if (!directed_eoi_enabled && !(v & (1 << (i & 0x1f)))) { atomic_inc(&irq_mis_count); spin_lock(&ioapic_lock); __edge_IO_APIC_irq(irq); __level_IO_APIC_irq(irq); spin_unlock(&ioapic_lock); } } static void end_level_ioapic_irq (unsigned int irq) { unsigned long v; int i; if ( !ioapic_ack_new ) { if ( irq_desc[irq].status & IRQ_DISABLED ) return; if ( directed_eoi_enabled ) eoi_IO_APIC_irq(irq); else unmask_IO_APIC_irq(irq); return; } /* * It appears there is an erratum which affects at least version 0x11 * of I/O APIC (that's the 82093AA and cores integrated into various * chipsets). Under certain conditions a level-triggered interrupt is * erroneously delivered as edge-triggered one but the respective IRR * bit gets set nevertheless. As a result the I/O unit expects an EOI * message but it will never arrive and further interrupts are blocked * from the source. The exact reason is so far unknown, but the * phenomenon was observed when two consecutive interrupt requests * from a given source get delivered to the same CPU and the source is * temporarily disabled in between. * * A workaround is to simulate an EOI message manually. We achieve it * by setting the trigger mode to edge and then to level when the edge * trigger mode gets detected in the TMR of a local APIC for a * level-triggered interrupt. We mask the source for the time of the * operation to prevent an edge-triggered interrupt escaping meanwhile. * The idea is from Manfred Spraul. --macro */ i = IO_APIC_VECTOR(irq); v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1)); ack_APIC_irq(); if ((irq_desc[irq].status & IRQ_MOVE_PENDING) && !io_apic_level_ack_pending(irq)) move_native_irq(irq); if (!(v & (1 << (i & 0x1f)))) { atomic_inc(&irq_mis_count); spin_lock(&ioapic_lock); __mask_IO_APIC_irq(irq); __edge_IO_APIC_irq(irq); __level_IO_APIC_irq(irq); if ( !(irq_desc[irq].status & IRQ_DISABLED) ) __unmask_IO_APIC_irq(irq); spin_unlock(&ioapic_lock); } } static void disable_edge_ioapic_irq(unsigned int irq) { } static void end_edge_ioapic_irq(unsigned int irq) { } /* * Level and edge triggered IO-APIC interrupts need different handling, * so we use two separate IRQ descriptors. Edge triggered IRQs can be * handled with the level-triggered descriptor, but that one has slightly * more overhead. Level-triggered interrupts cannot be handled with the * edge-triggered handler, without risking IRQ storms and other ugly * races. */ static hw_irq_controller ioapic_edge_type = { .typename = "IO-APIC-edge", .startup = startup_edge_ioapic_irq, .shutdown = disable_edge_ioapic_irq, .enable = unmask_IO_APIC_irq, .disable = disable_edge_ioapic_irq, .ack = ack_edge_ioapic_irq, .end = end_edge_ioapic_irq, .set_affinity = set_ioapic_affinity_irq, }; static hw_irq_controller ioapic_level_type = { .typename = "IO-APIC-level", .startup = startup_level_ioapic_irq, .shutdown = mask_IO_APIC_irq, .enable = unmask_IO_APIC_irq, .disable = mask_IO_APIC_irq, .ack = mask_and_ack_level_ioapic_irq, .end = end_level_ioapic_irq, .set_affinity = set_ioapic_affinity_irq, }; static unsigned int startup_msi_irq(unsigned int irq) { unmask_msi_irq(irq); return 0; } static void ack_msi_irq(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); irq_complete_move(&desc); move_native_irq(irq); if ( msi_maskable_irq(desc->msi_desc) ) ack_APIC_irq(); /* ACKTYPE_NONE */ } static void end_msi_irq(unsigned int irq) { if ( !msi_maskable_irq(irq_desc[irq].msi_desc) ) ack_APIC_irq(); /* ACKTYPE_EOI */ } #define shutdown_msi_irq mask_msi_irq /* * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices, * which implement the MSI or MSI-X Capability Structure. */ hw_irq_controller pci_msi_type = { .typename = "PCI-MSI", .startup = startup_msi_irq, .shutdown = shutdown_msi_irq, .enable = unmask_msi_irq, .disable = mask_msi_irq, .ack = ack_msi_irq, .end = end_msi_irq, .set_affinity = set_msi_affinity, }; static inline void init_IO_APIC_traps(void) { int irq; /* Xen: This is way simpler than the Linux implementation. */ for (irq = 0; platform_legacy_irq(irq); irq++) if (IO_APIC_IRQ(irq) && !IO_APIC_VECTOR(irq)) make_8259A_irq(irq); } static void enable_lapic_irq(unsigned int irq) { unsigned long v; v = apic_read(APIC_LVT0); apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED); } static void disable_lapic_irq(unsigned int irq) { unsigned long v; v = apic_read(APIC_LVT0); apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED); } static void ack_lapic_irq(unsigned int irq) { ack_APIC_irq(); } static void end_lapic_irq(unsigned int irq) { /* nothing */ } static hw_irq_controller lapic_irq_type = { .typename = "local-APIC-edge", .startup = NULL, /* startup_irq() not used for IRQ0 */ .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */ .enable = enable_lapic_irq, .disable = disable_lapic_irq, .ack = ack_lapic_irq, .end = end_lapic_irq, }; /* * This looks a bit hackish but it's about the only one way of sending * a few INTA cycles to 8259As and any associated glue logic. ICR does * not support the ExtINT mode, unfortunately. We need to send these * cycles as some i82489DX-based boards have glue logic that keeps the * 8259A interrupt line asserted until INTA. --macro */ static inline void unlock_ExtINT_logic(void) { int apic, pin, i; struct IO_APIC_route_entry entry0, entry1; unsigned char save_control, save_freq_select; unsigned long flags; pin = find_isa_irq_pin(8, mp_INT); apic = find_isa_irq_apic(8, mp_INT); if (pin == -1) return; spin_lock_irqsave(&ioapic_lock, flags); *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin); *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin); spin_unlock_irqrestore(&ioapic_lock, flags); clear_IO_APIC_pin(apic, pin); memset(&entry1, 0, sizeof(entry1)); entry1.dest_mode = 0; /* physical delivery */ entry1.mask = 0; /* unmask IRQ now */ SET_DEST(entry1.dest.dest32, entry1.dest.physical.physical_dest, hard_smp_processor_id()); entry1.delivery_mode = dest_ExtINT; entry1.polarity = entry0.polarity; entry1.trigger = 0; entry1.vector = 0; spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1)); io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0)); spin_unlock_irqrestore(&ioapic_lock, flags); save_control = CMOS_READ(RTC_CONTROL); save_freq_select = CMOS_READ(RTC_FREQ_SELECT); CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6, RTC_FREQ_SELECT); CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL); i = 100; while (i-- > 0) { mdelay(10); if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF) i -= 10; } CMOS_WRITE(save_control, RTC_CONTROL); CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); clear_IO_APIC_pin(apic, pin); spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1)); io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0)); spin_unlock_irqrestore(&ioapic_lock, flags); } int timer_uses_ioapic_pin_0; /* * This code may look a bit paranoid, but it's supposed to cooperate with * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ * is so screwy. Thanks to Brian Perkins for testing/hacking this beast * fanatically on his truly buggy board. */ static inline void check_timer(void) { int apic1, pin1, apic2, pin2; int vector, ret; unsigned long flags; local_irq_save(flags); /* * get/set the timer IRQ vector: */ disable_8259A_irq(0); vector = FIRST_HIPRIORITY_VECTOR; clear_irq_vector(0); if ((ret = bind_irq_vector(0, vector, (cpumask_t)CPU_MASK_ALL))) printk(KERN_ERR"..IRQ0 is not set correctly with ioapic!!!, err:%d\n", ret); irq_desc[0].depth = 0; irq_desc[0].status &= ~IRQ_DISABLED; irq_desc[0].handler = &ioapic_edge_type; /* * Subtle, code in do_timer_interrupt() expects an AEOI * mode for the 8259A whenever interrupts are routed * through I/O APICs. Also IRQ0 has to be enabled in * the 8259A which implies the virtual wire has to be * disabled in the local APIC. */ apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); init_8259A(1); /* XEN: Ripped out the legacy missed-tick logic, so below is not needed. */ /*timer_ack = 1;*/ /*enable_8259A_irq(0);*/ pin1 = find_isa_irq_pin(0, mp_INT); apic1 = find_isa_irq_apic(0, mp_INT); pin2 = ioapic_i8259.pin; apic2 = ioapic_i8259.apic; if (pin1 == 0) timer_uses_ioapic_pin_0 = 1; printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n", vector, apic1, pin1, apic2, pin2); if (pin1 != -1) { /* * Ok, does IRQ0 through the IOAPIC work? */ unmask_IO_APIC_irq(0); if (timer_irq_works()) { local_irq_restore(flags); if (disable_timer_pin_1 > 0) clear_IO_APIC_pin(apic1, pin1); return; } clear_IO_APIC_pin(apic1, pin1); printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to " "IO-APIC\n"); } printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... "); if (pin2 != -1) { printk("\n..... (found pin %d) ...", pin2); /* * legacy devices should be connected to IO APIC #0 */ setup_ExtINT_IRQ0_pin(apic2, pin2, vector); if (timer_irq_works()) { local_irq_restore(flags); printk("works.\n"); if (pin1 != -1) replace_pin_at_irq(0, apic1, pin1, apic2, pin2); else add_pin_to_irq(0, apic2, pin2); return; } /* * Cleanup, just in case ... */ clear_IO_APIC_pin(apic2, pin2); } printk(" failed.\n"); if (nmi_watchdog == NMI_IO_APIC) { printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n"); nmi_watchdog = 0; } printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); disable_8259A_irq(0); irq_desc[0].handler = &lapic_irq_type; apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */ enable_8259A_irq(0); if (timer_irq_works()) { local_irq_restore(flags); printk(" works.\n"); return; } apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector); printk(" failed.\n"); printk(KERN_INFO "...trying to set up timer as ExtINT IRQ..."); /*timer_ack = 0;*/ init_8259A(0); make_8259A_irq(0); apic_write_around(APIC_LVT0, APIC_DM_EXTINT); unlock_ExtINT_logic(); local_irq_restore(flags); if (timer_irq_works()) { printk(" works.\n"); return; } printk(" failed :(.\n"); panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a " "report. Then try booting with the 'noapic' option"); } /* * * IRQ's that are handled by the PIC in the MPS IOAPIC case. * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ. * Linux doesn't really care, as it's not actually used * for any interrupt handling anyway. */ #define PIC_IRQS (1 << PIC_CASCADE_IR) static struct IO_APIC_route_entry *ioapic_pm_state; static void __init ioapic_pm_state_alloc(void) { int i, nr_entry = 0; for (i = 0; i < nr_ioapics; i++) nr_entry += nr_ioapic_registers[i]; ioapic_pm_state = _xmalloc(sizeof(struct IO_APIC_route_entry)*nr_entry, sizeof(struct IO_APIC_route_entry)); BUG_ON(ioapic_pm_state == NULL); } void __init setup_IO_APIC(void) { enable_IO_APIC(); if (acpi_ioapic) io_apic_irqs = ~0; /* all IRQs go through IOAPIC */ else io_apic_irqs = ~PIC_IRQS; printk("ENABLING IO-APIC IRQs\n"); printk(" -> Using %s ACK method\n", ioapic_ack_new ? "new" : "old"); /* * Set up IO-APIC IRQ routing. */ if (!acpi_ioapic) setup_ioapic_ids_from_mpc(); sync_Arb_IDs(); setup_IO_APIC_irqs(); init_IO_APIC_traps(); check_timer(); print_IO_APIC(); ioapic_pm_state_alloc(); register_keyhandler('z', &print_IO_APIC_keyhandler); } void ioapic_suspend(void) { struct IO_APIC_route_entry *entry = ioapic_pm_state; unsigned long flags; int apic, i; spin_lock_irqsave(&ioapic_lock, flags); for (apic = 0; apic < nr_ioapics; apic++) { for (i = 0; i < nr_ioapic_registers[apic]; i ++, entry ++ ) { *(((int *)entry) + 1) = io_apic_read(apic, 0x11 + 2 * i); *(((int *)entry) + 0) = io_apic_read(apic, 0x10 + 2 * i); } } spin_unlock_irqrestore(&ioapic_lock, flags); } void ioapic_resume(void) { struct IO_APIC_route_entry *entry = ioapic_pm_state; unsigned long flags; union IO_APIC_reg_00 reg_00; int i, apic; spin_lock_irqsave(&ioapic_lock, flags); for (apic = 0; apic < nr_ioapics; apic++){ reg_00.raw = io_apic_read(apic, 0); if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid) { reg_00.bits.ID = mp_ioapics[apic].mpc_apicid; io_apic_write(apic, 0, reg_00.raw); } for (i = 0; i < nr_ioapic_registers[apic]; i++, entry++) { io_apic_write(apic, 0x11+2*i, *(((int *)entry)+1)); io_apic_write(apic, 0x10+2*i, *(((int *)entry)+0)); } } spin_unlock_irqrestore(&ioapic_lock, flags); } /* -------------------------------------------------------------------------- ACPI-based IOAPIC Configuration -------------------------------------------------------------------------- */ #ifdef CONFIG_ACPI_BOOT int __init io_apic_get_unique_id (int ioapic, int apic_id) { union IO_APIC_reg_00 reg_00; static physid_mask_t apic_id_map = PHYSID_MASK_NONE; physid_mask_t tmp; unsigned long flags; int i = 0; /* * The P4 platform supports up to 256 APIC IDs on two separate APIC * buses (one for LAPICs, one for IOAPICs), where predecessors only * supports up to 16 on one shared APIC bus. * * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full * advantage of new APIC bus architecture. */ if (physids_empty(apic_id_map)) apic_id_map = ioapic_phys_id_map(phys_cpu_present_map); spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(ioapic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); if (apic_id >= get_physical_broadcast()) { printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying " "%d\n", ioapic, apic_id, reg_00.bits.ID); apic_id = reg_00.bits.ID; } /* * Every APIC in a system must have a unique ID or we get lots of nice * 'stuck on smp_invalidate_needed IPI wait' messages. */ if (check_apicid_used(apic_id_map, apic_id)) { for (i = 0; i < get_physical_broadcast(); i++) { if (!check_apicid_used(apic_id_map, i)) break; } if (i == get_physical_broadcast()) panic("Max apic_id exceeded!\n"); printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, " "trying %d\n", ioapic, apic_id, i); apic_id = i; } tmp = apicid_to_cpu_present(apic_id); physids_or(apic_id_map, apic_id_map, tmp); if (reg_00.bits.ID != apic_id) { reg_00.bits.ID = apic_id; spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(ioapic, 0, reg_00.raw); reg_00.raw = io_apic_read(ioapic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); /* Sanity check */ if (reg_00.bits.ID != apic_id) { printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic); return -1; } } apic_printk(APIC_VERBOSE, KERN_INFO "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id); return apic_id; } int __init io_apic_get_version (int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); reg_01.raw = io_apic_read(ioapic, 1); spin_unlock_irqrestore(&ioapic_lock, flags); return reg_01.bits.version; } int __init io_apic_get_redir_entries (int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); reg_01.raw = io_apic_read(ioapic, 1); spin_unlock_irqrestore(&ioapic_lock, flags); return reg_01.bits.entries; } int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low) { struct IO_APIC_route_entry entry; unsigned long flags; int vector; if (!IO_APIC_IRQ(irq)) { printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n", ioapic); return -EINVAL; } /* * Generate a PCI IRQ routing entry and program the IOAPIC accordingly. * Note that we mask (disable) IRQs now -- these get enabled when the * corresponding device driver registers for this IRQ. */ memset(&entry,0,sizeof(entry)); entry.delivery_mode = INT_DELIVERY_MODE; entry.dest_mode = INT_DEST_MODE; SET_DEST(entry.dest.dest32, entry.dest.logical.logical_dest, cpu_mask_to_apicid(TARGET_CPUS)); entry.trigger = edge_level; entry.polarity = active_high_low; entry.mask = 1; /* * IRQs < 16 are already in the irq_2_pin[] map */ if (!platform_legacy_irq(irq)) add_pin_to_irq(irq, ioapic, pin); vector = assign_irq_vector(irq); if (vector < 0) return vector; entry.vector = vector; apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry " "(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic, mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq, edge_level, active_high_low); ioapic_register_intr(irq, edge_level); if (!ioapic && platform_legacy_irq(irq)) disable_8259A_irq(irq); spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1)); io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0)); set_native_irq_info(irq, TARGET_CPUS); spin_unlock_irqrestore(&ioapic_lock, flags); return 0; } #endif /*CONFIG_ACPI_BOOT*/ static int ioapic_physbase_to_id(unsigned long physbase) { int apic; for ( apic = 0; apic < nr_ioapics; apic++ ) if ( mp_ioapics[apic].mpc_apicaddr == physbase ) return apic; return -EINVAL; } unsigned apic_gsi_base(int apic); static int apic_pin_2_gsi_irq(int apic, int pin) { int idx, irq; if (apic < 0) return -EINVAL; irq = apic_gsi_base(apic) + pin; if (apic == 0) { idx = find_irq_entry(apic, pin, mp_INT); if (idx >= 0) irq = pin_2_irq(idx, apic, pin); } return irq; } int ioapic_guest_read(unsigned long physbase, unsigned int reg, u32 *pval) { int apic; unsigned long flags; if ( (apic = ioapic_physbase_to_id(physbase)) < 0 ) return apic; spin_lock_irqsave(&ioapic_lock, flags); *pval = io_apic_read(apic, reg); spin_unlock_irqrestore(&ioapic_lock, flags); return 0; } #define WARN_BOGUS_WRITE(f, a...) \ dprintk(XENLOG_INFO, "\n%s: " \ "apic=%d, pin=%d, irq=%d\n" \ "%s: new_entry=%08x\n" \ "%s: " f, __FUNCTION__, apic, pin, irq, \ __FUNCTION__, *(u32 *)&rte, \ __FUNCTION__ , ##a ) int ioapic_guest_write(unsigned long physbase, unsigned int reg, u32 val) { int apic, pin, irq, ret, vector, pirq; struct IO_APIC_route_entry rte = { 0 }; unsigned long flags; struct irq_cfg *cfg; struct irq_desc *desc; if ( (apic = ioapic_physbase_to_id(physbase)) < 0 ) return apic; /* Only write to the first half of a route entry. */ if ( (reg < 0x10) || (reg & 1) ) return 0; pin = (reg - 0x10) >> 1; /* Write first half from guest; second half is target info. */ *(u32 *)&rte = val; /* * What about weird destination types? * SMI: Ignore? Ought to be set up by the BIOS. * NMI: Ignore? Watchdog functionality is Xen's concern. * INIT: Definitely ignore: probably a guest OS bug. * ExtINT: Ignore? Linux only asserts this at start of day. * For now, print a message and return an error. We can fix up on demand. */ if ( rte.delivery_mode > dest_LowestPrio ) { printk("ERROR: Attempt to write weird IOAPIC destination mode!\n"); printk(" APIC=%d/%d, lo-reg=%x\n", apic, pin, val); return -EINVAL; } /* * The guest does not know physical APIC arrangement (flat vs. cluster). * Apply genapic conventions for this platform. */ rte.delivery_mode = INT_DELIVERY_MODE; rte.dest_mode = INT_DEST_MODE; irq = apic_pin_2_gsi_irq(apic, pin); if ( irq < 0 ) return irq; desc = irq_to_desc(irq); cfg = desc->chip_data; /* * Since PHYSDEVOP_alloc_irq_vector is dummy, rte.vector is the pirq * which corresponds to this ioapic pin, retrieve it for building * pirq and irq mapping. Where the GSI is greater than 256, we assume * that dom0 pirq == irq. */ pirq = (irq >= 256) ? irq : rte.vector; if ( (pirq < 0) || (pirq >= dom0->nr_pirqs) ) return -EINVAL; if ( desc->action ) { spin_lock_irqsave(&ioapic_lock, flags); ret = io_apic_read(apic, 0x10 + 2 * pin); spin_unlock_irqrestore(&ioapic_lock, flags); rte.vector = cfg->vector; if ( *(u32*)&rte != ret ) WARN_BOGUS_WRITE("old_entry=%08x pirq=%d\n%s: " "Attempt to modify IO-APIC pin for in-use IRQ!\n", ret, pirq, __FUNCTION__); return 0; } if ( cfg->vector <= 0 || cfg->vector > LAST_DYNAMIC_VECTOR ) { vector = assign_irq_vector(irq); if ( vector < 0 ) return vector; printk(XENLOG_INFO "allocated vector %02x for irq %d\n", vector, irq); add_pin_to_irq(irq, apic, pin); } spin_lock(&pcidevs_lock); spin_lock(&dom0->event_lock); ret = map_domain_pirq(dom0, pirq, irq, MAP_PIRQ_TYPE_GSI, NULL); spin_unlock(&dom0->event_lock); spin_unlock(&pcidevs_lock); if ( ret < 0 ) return ret; spin_lock_irqsave(&ioapic_lock, flags); /* Set the correct irq-handling type. */ desc->handler = rte.trigger ? &ioapic_level_type: &ioapic_edge_type; /* Mask iff level triggered. */ rte.mask = rte.trigger; /* Set the vector field to the real vector! */ rte.vector = cfg->vector; SET_DEST(rte.dest.dest32, rte.dest.logical.logical_dest, cpu_mask_to_apicid(cfg->domain)); io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&rte) + 0)); io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&rte) + 1)); spin_unlock_irqrestore(&ioapic_lock, flags); return 0; } void dump_ioapic_irq_info(void) { struct irq_pin_list *entry; struct IO_APIC_route_entry rte; unsigned int irq, pin, printed = 0; unsigned long flags; for ( irq = 0; irq < nr_irqs_gsi; irq++ ) { entry = &irq_2_pin[irq]; if ( entry->pin == -1 ) continue; if ( !printed++ ) printk("IO-APIC interrupt information:\n"); printk(" IRQ%3d Vec%3d:\n", irq, irq_to_vector(irq)); for ( ; ; ) { pin = entry->pin; printk(" Apic 0x%02x, Pin %2d: ", entry->apic, pin); spin_lock_irqsave(&ioapic_lock, flags); *(((int *)&rte) + 0) = io_apic_read(entry->apic, 0x10 + 2 * pin); *(((int *)&rte) + 1) = io_apic_read(entry->apic, 0x11 + 2 * pin); spin_unlock_irqrestore(&ioapic_lock, flags); printk("vector=%u, delivery_mode=%u, dest_mode=%s, " "delivery_status=%d, polarity=%d, irr=%d, " "trigger=%s, mask=%d, dest_id:%d\n", rte.vector, rte.delivery_mode, rte.dest_mode ? "logical" : "physical", rte.delivery_status, rte.polarity, rte.irr, rte.trigger ? "level" : "edge", rte.mask, rte.dest.logical.logical_dest); if ( entry->next == 0 ) break; entry = &irq_2_pin[entry->next]; } } } unsigned highest_gsi(void); void __init init_ioapic_mappings(void) { unsigned long ioapic_phys; unsigned int i, idx = FIX_IO_APIC_BASE_0; union IO_APIC_reg_01 reg_01; if ( smp_found_config ) nr_irqs_gsi = 0; for ( i = 0; i < nr_ioapics; i++ ) { if ( smp_found_config ) { ioapic_phys = mp_ioapics[i].mpc_apicaddr; if ( !ioapic_phys ) { printk(KERN_ERR "WARNING: bogus zero IO-APIC address " "found in MPTABLE, disabling IO/APIC support!\n"); smp_found_config = 0; skip_ioapic_setup = 1; goto fake_ioapic_page; } } else { fake_ioapic_page: ioapic_phys = __pa(alloc_xenheap_page()); clear_page(__va(ioapic_phys)); } set_fixmap_nocache(idx, ioapic_phys); apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n", __fix_to_virt(idx), ioapic_phys); idx++; if ( smp_found_config ) { /* The number of IO-APIC IRQ registers (== #pins): */ reg_01.raw = io_apic_read(i, 1); nr_ioapic_registers[i] = reg_01.bits.entries + 1; nr_irqs_gsi += nr_ioapic_registers[i]; } } nr_irqs_gsi = max(nr_irqs_gsi, highest_gsi()); if ( !smp_found_config || skip_ioapic_setup || nr_irqs_gsi < 16 ) nr_irqs_gsi = 16; else if ( nr_irqs_gsi > MAX_GSI_IRQS) { /* for PHYSDEVOP_pirq_eoi_gmfn guest assumptions */ printk(KERN_WARNING "Limiting number of GSI IRQs found (%u) to %lu\n", nr_irqs_gsi, MAX_GSI_IRQS); nr_irqs_gsi = MAX_GSI_IRQS; } if (nr_irqs < 2 * nr_irqs_gsi) nr_irqs = 2 * nr_irqs_gsi; if (nr_irqs > MAX_NR_IRQS) nr_irqs = MAX_NR_IRQS; }