From 6fc31d54443bdc25a8166be15e3920a7e39d195d Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 12 Jan 2011 17:50:42 +0000 Subject: ARM: Defer lookup of machine_type to setup.c Since the debug macros no longer depend on the machine type information, the machine type lookup can be deferred to setup_arch() in setup.c which simplifies the code somewhat. We also move the __error_a functionality into setup.c for displaying a message when a bad machine ID is passed to the kernel via the LL debug code. We also log this into the kernel ring buffer which makes it possible to retrieve the message via a debugger. Original idea from Grant Likely. Acked-by: Grant Likely Tested-by: Tony Lindgren Signed-off-by: Russell King --- arch/arm/kernel/head-common.S | 90 ------------------------------------------- arch/arm/kernel/head-nommu.S | 3 -- arch/arm/kernel/head.S | 9 +---- arch/arm/kernel/setup.c | 39 ++++++++++++++++++- 4 files changed, 40 insertions(+), 101 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S index 8f57515bbdb0..c84b57d27d07 100644 --- a/arch/arm/kernel/head-common.S +++ b/arch/arm/kernel/head-common.S @@ -25,83 +25,6 @@ * machine ID for example). */ __HEAD -__error_a: -#ifdef CONFIG_DEBUG_LL - mov r4, r1 @ preserve machine ID - adr r0, str_a1 - bl printascii - mov r0, r4 - bl printhex8 - adr r0, str_a2 - bl printascii - adr r3, __lookup_machine_type_data - ldmia r3, {r4, r5, r6} @ get machine desc list - sub r4, r3, r4 @ get offset between virt&phys - add r5, r5, r4 @ convert virt addresses to - add r6, r6, r4 @ physical address space -1: ldr r0, [r5, #MACHINFO_TYPE] @ get machine type - bl printhex8 - mov r0, #'\t' - bl printch - ldr r0, [r5, #MACHINFO_NAME] @ get machine name - add r0, r0, r4 - bl printascii - mov r0, #'\n' - bl printch - add r5, r5, #SIZEOF_MACHINE_DESC @ next machine_desc - cmp r5, r6 - blo 1b - adr r0, str_a3 - bl printascii - b __error -ENDPROC(__error_a) - -str_a1: .asciz "\nError: unrecognized/unsupported machine ID (r1 = 0x" -str_a2: .asciz ").\n\nAvailable machine support:\n\nID (hex)\tNAME\n" -str_a3: .asciz "\nPlease check your kernel config and/or bootloader.\n" - .align -#else - b __error -#endif - -/* - * Lookup machine architecture in the linker-build list of architectures. - * Note that we can't use the absolute addresses for the __arch_info - * lists since we aren't running with the MMU on (and therefore, we are - * not in the correct address space). We have to calculate the offset. - * - * r1 = machine architecture number - * Returns: - * r3, r4, r6 corrupted - * r5 = mach_info pointer in physical address space - */ -__lookup_machine_type: - adr r3, __lookup_machine_type_data - ldmia r3, {r4, r5, r6} - sub r3, r3, r4 @ get offset between virt&phys - add r5, r5, r3 @ convert virt addresses to - add r6, r6, r3 @ physical address space -1: ldr r3, [r5, #MACHINFO_TYPE] @ get machine type - teq r3, r1 @ matches loader number? - beq 2f @ found - add r5, r5, #SIZEOF_MACHINE_DESC @ next machine_desc - cmp r5, r6 - blo 1b - mov r5, #0 @ unknown machine -2: mov pc, lr -ENDPROC(__lookup_machine_type) - -/* - * Look in arch/arm/kernel/arch.[ch] for information about the - * __arch_info structures. - */ - .align 2 - .type __lookup_machine_type_data, %object -__lookup_machine_type_data: - .long . - .long __arch_info_begin - .long __arch_info_end - .size __lookup_machine_type_data, . - __lookup_machine_type_data /* Determine validity of the r2 atags pointer. The heuristic requires * that the pointer be aligned, in the first 16k of physical RAM and @@ -109,8 +32,6 @@ __lookup_machine_type_data: * of this function may be more lenient with the physical address and * may also be able to move the ATAGS block if necessary. * - * r8 = machinfo - * * Returns: * r2 either valid atags pointer, or zero * r5, r6 corrupted @@ -184,17 +105,6 @@ __mmap_switched_data: .long init_thread_union + THREAD_START_SP @ sp .size __mmap_switched_data, . - __mmap_switched_data -/* - * This provides a C-API version of __lookup_machine_type - */ -ENTRY(lookup_machine_type) - stmfd sp!, {r4 - r6, lr} - mov r1, r0 - bl __lookup_machine_type - mov r0, r5 - ldmfd sp!, {r4 - r6, pc} -ENDPROC(lookup_machine_type) - /* * This provides a C-API version of __lookup_processor_type */ diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index 814ce1a73270..6b1e0ad9ec3b 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -44,9 +44,6 @@ ENTRY(stext) bl __lookup_processor_type @ r5=procinfo r9=cpuid movs r10, r5 @ invalid processor (r5=0)? beq __error_p @ yes, error 'p' - bl __lookup_machine_type @ r5=machinfo - movs r8, r5 @ invalid machine (r5=0)? - beq __error_a @ yes, error 'a' adr lr, BSYM(__after_proc_init) @ return (PIC) address ARM( add pc, r10, #PROCINFO_INITFUNC ) diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index c0225da3fb21..8a154b940fef 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -87,14 +87,10 @@ ENTRY(stext) movs r10, r5 @ invalid processor (r5=0)? THUMB( it eq ) @ force fixup-able long branch encoding beq __error_p @ yes, error 'p' - bl __lookup_machine_type @ r5=machinfo - movs r8, r5 @ invalid machine (r5=0)? - THUMB( it eq ) @ force fixup-able long branch encoding - beq __error_a @ yes, error 'a' /* * r1 = machine no, r2 = atags, - * r8 = machinfo, r9 = cpuid, r10 = procinfo + * r9 = cpuid, r10 = procinfo */ bl __vet_atags #ifdef CONFIG_SMP_ON_UP @@ -105,7 +101,7 @@ ENTRY(stext) /* * The following calls CPU specific code in a position independent * manner. See arch/arm/mm/proc-*.S for details. r10 = base of - * xxx_proc_info structure selected by __lookup_machine_type + * xxx_proc_info structure selected by __lookup_processor_type * above. On return, the CPU will be ready for the MMU to be * turned on, and r0 will hold the CPU control register value. */ @@ -124,7 +120,6 @@ ENDPROC(stext) * amount which are required to get the kernel running, which * generally means mapping in the kernel code. * - * r8 = machinfo * r9 = cpuid * r10 = procinfo * diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 420b8d6485d6..78678b07901c 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -308,7 +308,44 @@ static void __init cacheid_init(void) * already provide the required functionality. */ extern struct proc_info_list *lookup_processor_type(unsigned int); -extern struct machine_desc *lookup_machine_type(unsigned int); + +static void __init early_print(const char *str, ...) +{ + extern void printascii(const char *); + char buf[256]; + va_list ap; + + va_start(ap, str); + vsnprintf(buf, sizeof(buf), str, ap); + va_end(ap); + +#ifdef CONFIG_DEBUG_LL + printascii(buf); +#endif + printk("%s", buf); +} + +static struct machine_desc * __init lookup_machine_type(unsigned int type) +{ + extern struct machine_desc __arch_info_begin[], __arch_info_end[]; + struct machine_desc *p; + + for (p = __arch_info_begin; p < __arch_info_end; p++) + if (type == p->nr) + return p; + + early_print("\n" + "Error: unrecognized/unsupported machine ID (r1 = 0x%08x).\n\n" + "Available machine support:\n\nID (hex)\tNAME\n", type); + + for (p = __arch_info_begin; p < __arch_info_end; p++) + early_print("%08x\t%s\n", p->nr, p->name); + + early_print("\nPlease check your kernel config and/or bootloader.\n"); + + while (true) + /* can't use cpu_relax() here as it may require MMU setup */; +} static void __init feat_v6_fixup(void) { -- cgit v1.2.1 From 459c1517f9873b198af7dcded8d8cc84749bbb69 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 8 Jan 2011 11:49:20 +0000 Subject: ARM: DMA: top-down allocation in DMA coherent region Achieve better usage of the DMA coherent region by doing top-down allocation rather than bottom up. If we ask for a 128kB allocation, this will be aligned to 128kB and satisfied from the very bottom address. If we then ask for a 600kB allocation, this will be aligned to 1MB, and we will have a 896kB hole. Performing top-down allocation resolves this by allocating the 128kB at the very top, and then the 600kB can come in below it without any unnecessary wastage. This problem was reported by Janusz Krzysztofik, who had 2 x 128kB + 1 x 640kB allocations which wouldn't fit into 1MB. Tested-by: Janusz Krzysztofik Signed-off-by: Russell King --- arch/arm/mm/vmregion.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/mm/vmregion.c b/arch/arm/mm/vmregion.c index 935993e1b1ef..036fdbfdd62f 100644 --- a/arch/arm/mm/vmregion.c +++ b/arch/arm/mm/vmregion.c @@ -38,7 +38,7 @@ struct arm_vmregion * arm_vmregion_alloc(struct arm_vmregion_head *head, size_t align, size_t size, gfp_t gfp) { - unsigned long addr = head->vm_start, end = head->vm_end - size; + unsigned long start = head->vm_start, addr = head->vm_end; unsigned long flags; struct arm_vmregion *c, *new; @@ -54,21 +54,20 @@ arm_vmregion_alloc(struct arm_vmregion_head *head, size_t align, spin_lock_irqsave(&head->vm_lock, flags); - list_for_each_entry(c, &head->vm_list, vm_list) { - if ((addr + size) < addr) - goto nospc; - if ((addr + size) <= c->vm_start) + addr = rounddown(addr - size, align); + list_for_each_entry_reverse(c, &head->vm_list, vm_list) { + if (addr >= c->vm_end) goto found; - addr = ALIGN(c->vm_end, align); - if (addr > end) + addr = rounddown(c->vm_start - size, align); + if (addr < start) goto nospc; } found: /* - * Insert this entry _before_ the one we found. + * Insert this entry after the one we found. */ - list_add_tail(&new->vm_list, &c->vm_list); + list_add(&new->vm_list, &c->vm_list); new->vm_start = addr; new->vm_end = addr + size; new->vm_active = 1; -- cgit v1.2.1 From 2bbd7e9b74271b2d6a14b4840fc44afbea83774d Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 8 Jan 2011 12:05:09 +0000 Subject: ARM: fix some sparse errors in generic ARM code arch/arm/kernel/return_address.c:37:6: warning: symbol 'return_address' was not declared. Should it be static? arch/arm/kernel/setup.c:76:14: warning: symbol 'processor_id' was not declared. Should it be static? arch/arm/kernel/traps.c:259:1: warning: symbol 'die_lock' was not declared. Should it be static? arch/arm/vfp/vfpmodule.c:156:6: warning: symbol 'vfp_raise_sigfpe' was not declared. Should it be static? Signed-off-by: Russell King --- arch/arm/include/asm/cputype.h | 3 ++- arch/arm/kernel/return_address.c | 1 + arch/arm/kernel/traps.c | 2 +- arch/arm/vfp/vfpmodule.c | 2 +- 4 files changed, 5 insertions(+), 3 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h index 20ae96cc0020..ed5bc9e05a4e 100644 --- a/arch/arm/include/asm/cputype.h +++ b/arch/arm/include/asm/cputype.h @@ -23,6 +23,8 @@ #define CPUID_EXT_ISAR4 "c2, 4" #define CPUID_EXT_ISAR5 "c2, 5" +extern unsigned int processor_id; + #ifdef CONFIG_CPU_CP15 #define read_cpuid(reg) \ ({ \ @@ -43,7 +45,6 @@ __val; \ }) #else -extern unsigned int processor_id; #define read_cpuid(reg) (processor_id) #define read_cpuid_ext(reg) 0 #endif diff --git a/arch/arm/kernel/return_address.c b/arch/arm/kernel/return_address.c index df246da4ceca..0b13a72f855d 100644 --- a/arch/arm/kernel/return_address.c +++ b/arch/arm/kernel/return_address.c @@ -9,6 +9,7 @@ * the Free Software Foundation. */ #include +#include #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) #include diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index ee57640ba2bb..7f53c3651c58 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -256,7 +256,7 @@ static int __die(const char *str, int err, struct thread_info *thread, struct pt return ret; } -DEFINE_SPINLOCK(die_lock); +static DEFINE_SPINLOCK(die_lock); /* * This function is protected against re-entrancy. diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 0797cb528b46..25b89d817105 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -153,7 +153,7 @@ static struct notifier_block vfp_notifier_block = { * Raise a SIGFPE for the current process. * sicode describes the signal being raised. */ -void vfp_raise_sigfpe(unsigned int sicode, struct pt_regs *regs) +static void vfp_raise_sigfpe(unsigned int sicode, struct pt_regs *regs) { siginfo_t info; -- cgit v1.2.1 From a65d29225ed884456f3d34dcefd3a18df24af03b Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 8 Jan 2011 16:18:51 +0000 Subject: ARM: add 'uinstall' target for installing uboot kernels We have 'install' and 'zinstall' for installing Image and zImage kernels, so add 'uinstall' to complete the set. This allows developers to have a ~/bin/installkernel script which (eg) copies the kernel to the tftp server automatically once the kernel has built, resulting in a better workflow. Signed-off-by: Russell King --- arch/arm/Makefile | 3 ++- arch/arm/boot/Makefile | 4 ++++ 2 files changed, 6 insertions(+), 1 deletion(-) (limited to 'arch/arm') diff --git a/arch/arm/Makefile b/arch/arm/Makefile index c22c1adfedd6..da525bc96145 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -280,7 +280,7 @@ bzImage: zImage zImage Image xipImage bootpImage uImage: vmlinux $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ -zinstall install: vmlinux +zinstall uinstall install: vmlinux $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@ # We use MRPROPER_FILES and CLEAN_FILES now @@ -301,6 +301,7 @@ define archhelp echo ' (supply initrd image via make variable INITRD=)' echo ' install - Install uncompressed kernel' echo ' zinstall - Install compressed kernel' + echo ' uinstall - Install U-Boot wrapped compressed kernel' echo ' Install using (your) ~/bin/$(INSTALLKERNEL) or' echo ' (distribution) /sbin/$(INSTALLKERNEL) or' echo ' install to $$(INSTALL_PATH) and run lilo' diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile index 4d26f2c52a75..9128fddf1109 100644 --- a/arch/arm/boot/Makefile +++ b/arch/arm/boot/Makefile @@ -99,6 +99,10 @@ zinstall: $(obj)/zImage $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \ $(obj)/zImage System.map "$(INSTALL_PATH)" +uinstall: $(obj)/uImage + $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \ + $(obj)/uImage System.map "$(INSTALL_PATH)" + zi: $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \ $(obj)/zImage System.map "$(INSTALL_PATH)" -- cgit v1.2.1 From 68e6fad488ef21335529c65ca6c88c38be50cd3a Mon Sep 17 00:00:00 2001 From: Russell King Date: Tue, 11 Jan 2011 19:57:14 +0000 Subject: ARM: improve module relocation fixup diagnostics Current diagnostics are rather poor when things go wrong: ipv6: relocation out of range, section 2 reloc 0 sym 'snmp_mib_free' Let's include a little more information about the problem: ipv6: section 2 reloc 0 sym 'snmp_mib_free': relocation 28 out of range (0xbf0000a4 -> 0xc11b4858) so that we show exactly what the problem is - not only what type of relocation but also the offending address range too. Signed-off-by: Russell King --- arch/arm/kernel/module.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c index 2cfe8161b478..980fe20a376e 100644 --- a/arch/arm/kernel/module.c +++ b/arch/arm/kernel/module.c @@ -75,6 +75,7 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { unsigned long loc; Elf32_Sym *sym; + const char *symname; s32 offset; #ifdef CONFIG_THUMB2_KERNEL u32 upper, lower, sign, j1, j2; @@ -82,18 +83,18 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, offset = ELF32_R_SYM(rel->r_info); if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { - printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", + pr_err("%s: section %u reloc %u: bad relocation sym offset\n", module->name, relindex, i); return -ENOEXEC; } sym = ((Elf32_Sym *)symsec->sh_addr) + offset; + symname = strtab + sym->st_name; if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { - printk(KERN_ERR "%s: out of bounds relocation, " - "section %d reloc %d offset %d size %d\n", - module->name, relindex, i, rel->r_offset, - dstsec->sh_size); + pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n", + module->name, relindex, i, symname, + rel->r_offset, dstsec->sh_size); return -ENOEXEC; } @@ -119,10 +120,10 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, if (offset & 3 || offset <= (s32)0xfe000000 || offset >= (s32)0x02000000) { - printk(KERN_ERR - "%s: relocation out of range, section " - "%d reloc %d sym '%s'\n", module->name, - relindex, i, strtab + sym->st_name); + pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", + module->name, relindex, i, symname, + ELF32_R_TYPE(rel->r_info), loc, + sym->st_value); return -ENOEXEC; } @@ -195,10 +196,10 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, if (!(offset & 1) || offset <= (s32)0xff000000 || offset >= (s32)0x01000000) { - printk(KERN_ERR - "%s: relocation out of range, section " - "%d reloc %d sym '%s'\n", module->name, - relindex, i, strtab + sym->st_name); + pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", + module->name, relindex, i, symname, + ELF32_R_TYPE(rel->r_info), loc, + sym->st_value); return -ENOEXEC; } -- cgit v1.2.1 From a9f43c113d7435441fb024d265aecacc4f623f5e Mon Sep 17 00:00:00 2001 From: Colin Tuckley Date: Thu, 6 Jan 2011 11:16:49 +0100 Subject: ARM: 6608/1: enable bridges in pci_common_init. Add a missing call to pci_enable_bridges() so that devices behind bridges get found by the pci bus scan. Signed-off-by: Chris Partington Acked-by: Catalin Marinas Signed-off-by: Russell King --- arch/arm/kernel/bios32.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index c6273a3bfc25..d86fcd44b220 100644 --- a/arch/arm/kernel/bios32.c +++ b/arch/arm/kernel/bios32.c @@ -583,6 +583,11 @@ void __init pci_common_init(struct hw_pci *hw) * Assign resources. */ pci_bus_assign_resources(bus); + + /* + * Enable bridges + */ + pci_enable_bridges(bus); } /* -- cgit v1.2.1 From 1dbfa187dad57d3e17207328ec8bd2d90b4177d2 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 23 Jan 2011 12:08:16 +0000 Subject: ARM: irq migration: force migration off CPU going down The force argument to irq_set_affinity really should be 'true' as moving IRQs off a CPU which is going down isn't optional. Acked-by: Thomas Gleixner Signed-off-by: Russell King --- arch/arm/kernel/irq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm') diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index 28536e352deb..2f19aa5f3391 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -185,7 +185,7 @@ static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu) raw_spin_lock_irq(&desc->lock); desc->irq_data.chip->irq_set_affinity(&desc->irq_data, - cpumask_of(cpu), false); + cpumask_of(cpu), true); raw_spin_unlock_irq(&desc->lock); } -- cgit v1.2.1 From 617912440bf20497d23d01ab58076998aced3f15 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 23 Jan 2011 12:09:36 +0000 Subject: ARM: irq migration: ensure migration is handled safely Ensure appropriate locks are taken to ensure that IRQ migration off the current CPU is race-free. We may have a concurrent set_affinity via procfs running on another CPU in parallel with the IRQ migration, resulting in unpredictable results. Signed-off-by: Russell King --- arch/arm/kernel/irq.c | 50 +++++++++++++++++++++++++++++++------------------- 1 file changed, 31 insertions(+), 19 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index 2f19aa5f3391..3535d3793e65 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -179,14 +179,21 @@ int __init arch_probe_nr_irqs(void) #ifdef CONFIG_HOTPLUG_CPU -static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu) +static bool migrate_one_irq(struct irq_data *d) { - pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->irq_data.node, cpu); + unsigned int cpu = cpumask_any_and(d->affinity, cpu_online_mask); + bool ret = false; - raw_spin_lock_irq(&desc->lock); - desc->irq_data.chip->irq_set_affinity(&desc->irq_data, - cpumask_of(cpu), true); - raw_spin_unlock_irq(&desc->lock); + if (cpu >= nr_cpu_ids) { + cpu = cpumask_any(cpu_online_mask); + ret = true; + } + + pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", d->irq, d->node, cpu); + + d->chip->irq_set_affinity(d, cpumask_of(cpu), true); + + return ret; } /* @@ -198,25 +205,30 @@ void migrate_irqs(void) { unsigned int i, cpu = smp_processor_id(); struct irq_desc *desc; + unsigned long flags; + + local_irq_save(flags); for_each_irq_desc(i, desc) { struct irq_data *d = &desc->irq_data; + bool affinity_broken = false; - if (d->node == cpu) { - unsigned int newcpu = cpumask_any_and(d->affinity, - cpu_online_mask); - if (newcpu >= nr_cpu_ids) { - if (printk_ratelimit()) - printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n", - i, cpu); + raw_spin_lock(&desc->lock); + do { + if (desc->action == NULL) + break; - cpumask_setall(d->affinity); - newcpu = cpumask_any_and(d->affinity, - cpu_online_mask); - } + if (d->node != cpu) + break; - route_irq(desc, i, newcpu); - } + affinity_broken = migrate_one_irq(d); + } while (0); + raw_spin_unlock(&desc->lock); + + if (affinity_broken && printk_ratelimit()) + pr_warning("IRQ%u no longer affine to CPU%u\n", i, cpu); } + + local_irq_restore(flags); } #endif /* CONFIG_HOTPLUG_CPU */ -- cgit v1.2.1 From c191789c787f488fdb74de0ee55258f71a427704 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 23 Jan 2011 12:12:01 +0000 Subject: ARM: irq migration: update GIC migration code This cleans up after the conversion to irq_data. Rename the function to match the method, and remove the now useless lookup of the irq descriptor which is never used. Move the bitmask calculation out of the irq_controller_lock region. Signed-off-by: Russell King --- arch/arm/common/gic.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index 224377211151..e21c1f4218d3 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -142,25 +142,24 @@ static int gic_set_type(struct irq_data *d, unsigned int type) } #ifdef CONFIG_SMP -static int -gic_set_cpu(struct irq_data *d, const struct cpumask *mask_val, bool force) +static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, + bool force) { void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3); unsigned int shift = (d->irq % 4) * 8; unsigned int cpu = cpumask_first(mask_val); - u32 val; - struct irq_desc *desc; + u32 val, mask, bit; - spin_lock(&irq_controller_lock); - desc = irq_to_desc(d->irq); - if (desc == NULL) { - spin_unlock(&irq_controller_lock); + if (cpu >= 8) return -EINVAL; - } + + mask = 0xff << shift; + bit = 1 << (cpu + shift); + + spin_lock(&irq_controller_lock); d->node = cpu; - val = readl(reg) & ~(0xff << shift); - val |= 1 << (cpu + shift); - writel(val, reg); + val = readl(reg) & ~mask; + writel(val | bit, reg); spin_unlock(&irq_controller_lock); return 0; @@ -203,7 +202,7 @@ static struct irq_chip gic_chip = { .irq_unmask = gic_unmask_irq, .irq_set_type = gic_set_type, #ifdef CONFIG_SMP - .irq_set_affinity = gic_set_cpu, + .irq_set_affinity = gic_set_affinity, #endif }; -- cgit v1.2.1 From aaa50048f6ce44af66ce0389d4cc6a8348333271 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Tue, 25 Jan 2011 21:35:38 +0100 Subject: ARM: 6639/1: allow highmem on SMP platforms without h/w TLB ops broadcast In commit e616c591405c168f6dc3dfd1221e105adfe49b8d, highmem support was deactivated for SMP platforms without hardware TLB ops broadcast because usage of kmap_high_get() requires that IRQs be disabled when kmap_lock is locked which is incompatible with the IPI mechanism used by the software TLB ops broadcast invoked through flush_all_zero_pkmaps(). The reason for kmap_high_get() is to ensure that the currently kmap'd page usage count does not decrease to zero while we're using its existing virtual mapping in an atomic context. With a VIVT cache this is essential to do due to cache coherency issues, but with a VIPT cache this is only an optimization so not to pay the price of establishing a second mapping if an existing one can be used. However, on VIPT platforms without hardware TLB maintenance we can give up on that optimization in order to be able to use highmem. From ARMv7 onwards the TLB ops are broadcasted in hardware, so let's disable ARCH_NEEDS_KMAP_HIGH_GET only when CONFIG_SMP and CONFIG_CPU_TLB_V6 are defined. Signed-off-by: Nicolas Pitre Tested-by: Saeed Bishara Signed-off-by: Russell King --- arch/arm/include/asm/highmem.h | 29 +++++++++++++++++++++++++++-- arch/arm/mm/mmu.c | 10 ---------- 2 files changed, 27 insertions(+), 12 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h index 7080e2c8fa62..a4edd19dd3d6 100644 --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -19,11 +19,36 @@ extern pte_t *pkmap_page_table; +extern void *kmap_high(struct page *page); +extern void kunmap_high(struct page *page); + +/* + * The reason for kmap_high_get() is to ensure that the currently kmap'd + * page usage count does not decrease to zero while we're using its + * existing virtual mapping in an atomic context. With a VIVT cache this + * is essential to do, but with a VIPT cache this is only an optimization + * so not to pay the price of establishing a second mapping if an existing + * one can be used. However, on platforms without hardware TLB maintenance + * broadcast, we simply cannot use ARCH_NEEDS_KMAP_HIGH_GET at all since + * the locking involved must also disable IRQs which is incompatible with + * the IPI mechanism used by global TLB operations. + */ #define ARCH_NEEDS_KMAP_HIGH_GET +#if defined(CONFIG_SMP) && defined(CONFIG_CPU_TLB_V6) +#undef ARCH_NEEDS_KMAP_HIGH_GET +#if defined(CONFIG_HIGHMEM) && defined(CONFIG_CPU_CACHE_VIVT) +#error "The sum of features in your kernel config cannot be supported together" +#endif +#endif -extern void *kmap_high(struct page *page); +#ifdef ARCH_NEEDS_KMAP_HIGH_GET extern void *kmap_high_get(struct page *page); -extern void kunmap_high(struct page *page); +#else +static inline void *kmap_high_get(struct page *page) +{ + return NULL; +} +#endif /* * The following functions are already defined by diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 3c67e92f7d59..ff7b43b5885a 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -827,16 +827,6 @@ static void __init sanity_check_meminfo(void) * rather difficult. */ reason = "with VIPT aliasing cache"; - } else if (is_smp() && tlb_ops_need_broadcast()) { - /* - * kmap_high needs to occasionally flush TLB entries, - * however, if the TLB entries need to be broadcast - * we may deadlock: - * kmap_high(irqs off)->flush_all_zero_pkmaps-> - * flush_tlb_kernel_range->smp_call_function_many - * (must not be called with irqs off) - */ - reason = "without hardware TLB ops broadcasting"; } if (reason) { printk(KERN_CRIT "HIGHMEM is not supported %s, ignoring high memory\n", -- cgit v1.2.1 From 74c25beeb30fa32badf575a908902cbdef4d4eb4 Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 31 Jan 2011 14:43:25 +0000 Subject: ARM: vfp: improve commentry for hotplug events Improve the documentation for the VFP hotplug notifier handler, so that people better understand what's going on there and what has been done for them. Signed-off-by: Russell King --- arch/arm/vfp/vfpmodule.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 25b89d817105..bbf3da012afd 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -489,8 +489,11 @@ void vfp_flush_hwstate(struct thread_info *thread) /* * VFP hardware can lose all context when a CPU goes offline. - * Safely clear our held state when a CPU has been killed, and - * re-enable access to VFP when the CPU comes back online. + * As we will be running in SMP mode with CPU hotplug, we will save the + * hardware state at every thread switch. We clear our held state when + * a CPU has been killed, indicating that the VFP hardware doesn't contain + * a threads VFP state. When a CPU starts up, we re-enable access to the + * VFP hardware. * * Both CPU_DYING and CPU_STARTING are called on the CPU which * is being offlined/onlined. -- cgit v1.2.1 From b11fe38883d1de76f2f847943e085a808f83f189 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Sat, 12 Feb 2011 22:25:27 +0100 Subject: ARM: 6663/1: make Thumb2 kernel entry point more similar to the ARM one Some installers would binary patch the kernel zImage to replace the first few nops with custom instructions. This breaks the Thumb2 kernel as the mode switch is right at the beginning. Let's move it towards the end of the nop sequence instead. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/boot/compressed/head.S | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 7193884ed8b0..920f4dbd4883 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -128,14 +128,14 @@ wait: mrc p14, 0, pc, c0, c1, 0 .arm @ Always enter in ARM state start: .type start,#function - THUMB( adr r12, BSYM(1f) ) - THUMB( bx r12 ) - THUMB( .rept 6 ) - ARM( .rept 8 ) + .rept 7 mov r0, r0 .endr + ARM( mov r0, r0 ) + ARM( b 1f ) + THUMB( adr r12, BSYM(1f) ) + THUMB( bx r12 ) - b 1f .word 0x016f2818 @ Magic numbers to help the loader .word start @ absolute load/run zImage address .word _edata @ zImage end address -- cgit v1.2.1 From 5637a126482026b37d426d76e1b18f748f309aaa Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 14 Feb 2011 15:55:45 +0000 Subject: ARM: move L1_CACHE_SHIFT_6 to mm/Kconfig Move L1_CACHE_SHIFT related options together, rather than spreading them across two separate Kconfig files. Signed-off-by: Russell King --- arch/arm/Kconfig | 5 ----- arch/arm/mm/Kconfig | 5 +++++ 2 files changed, 5 insertions(+), 5 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 5cff165b7eb0..65ea7bb57c4d 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -178,11 +178,6 @@ config FIQ config ARCH_MTD_XIP bool -config ARM_L1_CACHE_SHIFT_6 - bool - help - Setting ARM L1 cache line size to 64 Bytes. - config VECTORS_BASE hex default 0xffff0000 if MMU || CPU_HIGH_VECTOR diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 9d30c6f804b9..a51661be1412 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -845,6 +845,11 @@ config CACHE_XSC3L2 help This option enables the L2 cache on XScale3. +config ARM_L1_CACHE_SHIFT_6 + bool + help + Setting ARM L1 cache line size to 64 Bytes. + config ARM_L1_CACHE_SHIFT int default 6 if ARM_L1_CACHE_SHIFT_6 -- cgit v1.2.1 From 425fc47adb5bb69f76285be77a09a3341a30799e Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Mon, 14 Feb 2011 14:31:09 +0100 Subject: ARM: 6668/1: ptrace: remove single-step emulation code PTRACE_SINGLESTEP is a ptrace request designed to offer single-stepping support to userspace when the underlying architecture has hardware support for this operation. On ARM, we set arch_has_single_step() to 1 and attempt to emulate hardware single-stepping by disassembling the current instruction to determine the next pc and placing a software breakpoint on that location. Unfortunately this has the following problems: 1.) Only a subset of ARMv7 instructions are supported 2.) Thumb-2 is unsupported 3.) The code is not SMP safe We could try to fix this code, but it turns out that because of the above issues it is rarely used in practice. GDB, for example, uses PTRACE_POKETEXT and PTRACE_PEEKTEXT to manage breakpoints itself and does not require any kernel assistance. This patch removes the single-step emulation code from ptrace meaning that the PTRACE_SINGLESTEP request will return -EIO on ARM. Portable code must check the return value from a ptrace call and handle the failure gracefully. Acked-by: Nicolas Pitre Signed-off-by: Will Deacon Signed-off-by: Russell King --- arch/arm/include/asm/processor.h | 12 -- arch/arm/include/asm/ptrace.h | 2 - arch/arm/include/asm/traps.h | 1 + arch/arm/kernel/ptrace.c | 383 +-------------------------------------- arch/arm/kernel/ptrace.h | 37 ---- arch/arm/kernel/signal.c | 9 - arch/arm/kernel/traps.c | 2 +- 7 files changed, 3 insertions(+), 443 deletions(-) delete mode 100644 arch/arm/kernel/ptrace.h (limited to 'arch/arm') diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h index 67357baaeeeb..b439b41aeac1 100644 --- a/arch/arm/include/asm/processor.h +++ b/arch/arm/include/asm/processor.h @@ -29,19 +29,7 @@ #define STACK_TOP_MAX TASK_SIZE #endif -union debug_insn { - u32 arm; - u16 thumb; -}; - -struct debug_entry { - u32 address; - union debug_insn insn; -}; - struct debug_info { - int nsaved; - struct debug_entry bp[2]; #ifdef CONFIG_HAVE_HW_BREAKPOINT struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; #endif diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 783d50f32618..a8ff22b2a391 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -130,8 +130,6 @@ struct pt_regs { #ifdef __KERNEL__ -#define arch_has_single_step() (1) - #define user_mode(regs) \ (((regs)->ARM_cpsr & 0xf) == 0) diff --git a/arch/arm/include/asm/traps.h b/arch/arm/include/asm/traps.h index 1b960d5ef6a5..f90756dc16dc 100644 --- a/arch/arm/include/asm/traps.h +++ b/arch/arm/include/asm/traps.h @@ -45,6 +45,7 @@ static inline int in_exception_text(unsigned long ptr) extern void __init early_trap_init(void); extern void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame); +extern void ptrace_break(struct task_struct *tsk, struct pt_regs *regs); extern void *vectors_page; diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index 19c6816db61e..eace844511f1 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -26,8 +26,6 @@ #include #include -#include "ptrace.h" - #define REG_PC 15 #define REG_PSR 16 /* @@ -184,389 +182,12 @@ put_user_reg(struct task_struct *task, int offset, long data) return ret; } -static inline int -read_u32(struct task_struct *task, unsigned long addr, u32 *res) -{ - int ret; - - ret = access_process_vm(task, addr, res, sizeof(*res), 0); - - return ret == sizeof(*res) ? 0 : -EIO; -} - -static inline int -read_instr(struct task_struct *task, unsigned long addr, u32 *res) -{ - int ret; - - if (addr & 1) { - u16 val; - ret = access_process_vm(task, addr & ~1, &val, sizeof(val), 0); - ret = ret == sizeof(val) ? 0 : -EIO; - *res = val; - } else { - u32 val; - ret = access_process_vm(task, addr & ~3, &val, sizeof(val), 0); - ret = ret == sizeof(val) ? 0 : -EIO; - *res = val; - } - return ret; -} - -/* - * Get value of register `rn' (in the instruction) - */ -static unsigned long -ptrace_getrn(struct task_struct *child, unsigned long insn) -{ - unsigned int reg = (insn >> 16) & 15; - unsigned long val; - - val = get_user_reg(child, reg); - if (reg == 15) - val += 8; - - return val; -} - -/* - * Get value of operand 2 (in an ALU instruction) - */ -static unsigned long -ptrace_getaluop2(struct task_struct *child, unsigned long insn) -{ - unsigned long val; - int shift; - int type; - - if (insn & 1 << 25) { - val = insn & 255; - shift = (insn >> 8) & 15; - type = 3; - } else { - val = get_user_reg (child, insn & 15); - - if (insn & (1 << 4)) - shift = (int)get_user_reg (child, (insn >> 8) & 15); - else - shift = (insn >> 7) & 31; - - type = (insn >> 5) & 3; - } - - switch (type) { - case 0: val <<= shift; break; - case 1: val >>= shift; break; - case 2: - val = (((signed long)val) >> shift); - break; - case 3: - val = (val >> shift) | (val << (32 - shift)); - break; - } - return val; -} - -/* - * Get value of operand 2 (in a LDR instruction) - */ -static unsigned long -ptrace_getldrop2(struct task_struct *child, unsigned long insn) -{ - unsigned long val; - int shift; - int type; - - val = get_user_reg(child, insn & 15); - shift = (insn >> 7) & 31; - type = (insn >> 5) & 3; - - switch (type) { - case 0: val <<= shift; break; - case 1: val >>= shift; break; - case 2: - val = (((signed long)val) >> shift); - break; - case 3: - val = (val >> shift) | (val << (32 - shift)); - break; - } - return val; -} - -#define OP_MASK 0x01e00000 -#define OP_AND 0x00000000 -#define OP_EOR 0x00200000 -#define OP_SUB 0x00400000 -#define OP_RSB 0x00600000 -#define OP_ADD 0x00800000 -#define OP_ADC 0x00a00000 -#define OP_SBC 0x00c00000 -#define OP_RSC 0x00e00000 -#define OP_ORR 0x01800000 -#define OP_MOV 0x01a00000 -#define OP_BIC 0x01c00000 -#define OP_MVN 0x01e00000 - -static unsigned long -get_branch_address(struct task_struct *child, unsigned long pc, unsigned long insn) -{ - u32 alt = 0; - - switch (insn & 0x0e000000) { - case 0x00000000: - case 0x02000000: { - /* - * data processing - */ - long aluop1, aluop2, ccbit; - - if ((insn & 0x0fffffd0) == 0x012fff10) { - /* - * bx or blx - */ - alt = get_user_reg(child, insn & 15); - break; - } - - - if ((insn & 0xf000) != 0xf000) - break; - - aluop1 = ptrace_getrn(child, insn); - aluop2 = ptrace_getaluop2(child, insn); - ccbit = get_user_reg(child, REG_PSR) & PSR_C_BIT ? 1 : 0; - - switch (insn & OP_MASK) { - case OP_AND: alt = aluop1 & aluop2; break; - case OP_EOR: alt = aluop1 ^ aluop2; break; - case OP_SUB: alt = aluop1 - aluop2; break; - case OP_RSB: alt = aluop2 - aluop1; break; - case OP_ADD: alt = aluop1 + aluop2; break; - case OP_ADC: alt = aluop1 + aluop2 + ccbit; break; - case OP_SBC: alt = aluop1 - aluop2 + ccbit; break; - case OP_RSC: alt = aluop2 - aluop1 + ccbit; break; - case OP_ORR: alt = aluop1 | aluop2; break; - case OP_MOV: alt = aluop2; break; - case OP_BIC: alt = aluop1 & ~aluop2; break; - case OP_MVN: alt = ~aluop2; break; - } - break; - } - - case 0x04000000: - case 0x06000000: - /* - * ldr - */ - if ((insn & 0x0010f000) == 0x0010f000) { - unsigned long base; - - base = ptrace_getrn(child, insn); - if (insn & 1 << 24) { - long aluop2; - - if (insn & 0x02000000) - aluop2 = ptrace_getldrop2(child, insn); - else - aluop2 = insn & 0xfff; - - if (insn & 1 << 23) - base += aluop2; - else - base -= aluop2; - } - read_u32(child, base, &alt); - } - break; - - case 0x08000000: - /* - * ldm - */ - if ((insn & 0x00108000) == 0x00108000) { - unsigned long base; - unsigned int nr_regs; - - if (insn & (1 << 23)) { - nr_regs = hweight16(insn & 65535) << 2; - - if (!(insn & (1 << 24))) - nr_regs -= 4; - } else { - if (insn & (1 << 24)) - nr_regs = -4; - else - nr_regs = 0; - } - - base = ptrace_getrn(child, insn); - - read_u32(child, base + nr_regs, &alt); - break; - } - break; - - case 0x0a000000: { - /* - * bl or b - */ - signed long displ; - /* It's a branch/branch link: instead of trying to - * figure out whether the branch will be taken or not, - * we'll put a breakpoint at both locations. This is - * simpler, more reliable, and probably not a whole lot - * slower than the alternative approach of emulating the - * branch. - */ - displ = (insn & 0x00ffffff) << 8; - displ = (displ >> 6) + 8; - if (displ != 0 && displ != 4) - alt = pc + displ; - } - break; - } - - return alt; -} - -static int -swap_insn(struct task_struct *task, unsigned long addr, - void *old_insn, void *new_insn, int size) -{ - int ret; - - ret = access_process_vm(task, addr, old_insn, size, 0); - if (ret == size) - ret = access_process_vm(task, addr, new_insn, size, 1); - return ret; -} - -static void -add_breakpoint(struct task_struct *task, struct debug_info *dbg, unsigned long addr) -{ - int nr = dbg->nsaved; - - if (nr < 2) { - u32 new_insn = BREAKINST_ARM; - int res; - - res = swap_insn(task, addr, &dbg->bp[nr].insn, &new_insn, 4); - - if (res == 4) { - dbg->bp[nr].address = addr; - dbg->nsaved += 1; - } - } else - printk(KERN_ERR "ptrace: too many breakpoints\n"); -} - -/* - * Clear one breakpoint in the user program. We copy what the hardware - * does and use bit 0 of the address to indicate whether this is a Thumb - * breakpoint or an ARM breakpoint. - */ -static void clear_breakpoint(struct task_struct *task, struct debug_entry *bp) -{ - unsigned long addr = bp->address; - union debug_insn old_insn; - int ret; - - if (addr & 1) { - ret = swap_insn(task, addr & ~1, &old_insn.thumb, - &bp->insn.thumb, 2); - - if (ret != 2 || old_insn.thumb != BREAKINST_THUMB) - printk(KERN_ERR "%s:%d: corrupted Thumb breakpoint at " - "0x%08lx (0x%04x)\n", task->comm, - task_pid_nr(task), addr, old_insn.thumb); - } else { - ret = swap_insn(task, addr & ~3, &old_insn.arm, - &bp->insn.arm, 4); - - if (ret != 4 || old_insn.arm != BREAKINST_ARM) - printk(KERN_ERR "%s:%d: corrupted ARM breakpoint at " - "0x%08lx (0x%08x)\n", task->comm, - task_pid_nr(task), addr, old_insn.arm); - } -} - -void ptrace_set_bpt(struct task_struct *child) -{ - struct pt_regs *regs; - unsigned long pc; - u32 insn; - int res; - - regs = task_pt_regs(child); - pc = instruction_pointer(regs); - - if (thumb_mode(regs)) { - printk(KERN_WARNING "ptrace: can't handle thumb mode\n"); - return; - } - - res = read_instr(child, pc, &insn); - if (!res) { - struct debug_info *dbg = &child->thread.debug; - unsigned long alt; - - dbg->nsaved = 0; - - alt = get_branch_address(child, pc, insn); - if (alt) - add_breakpoint(child, dbg, alt); - - /* - * Note that we ignore the result of setting the above - * breakpoint since it may fail. When it does, this is - * not so much an error, but a forewarning that we may - * be receiving a prefetch abort shortly. - * - * If we don't set this breakpoint here, then we can - * lose control of the thread during single stepping. - */ - if (!alt || predicate(insn) != PREDICATE_ALWAYS) - add_breakpoint(child, dbg, pc + 4); - } -} - -/* - * Ensure no single-step breakpoint is pending. Returns non-zero - * value if child was being single-stepped. - */ -void ptrace_cancel_bpt(struct task_struct *child) -{ - int i, nsaved = child->thread.debug.nsaved; - - child->thread.debug.nsaved = 0; - - if (nsaved > 2) { - printk("ptrace_cancel_bpt: bogus nsaved: %d!\n", nsaved); - nsaved = 2; - } - - for (i = 0; i < nsaved; i++) - clear_breakpoint(child, &child->thread.debug.bp[i]); -} - -void user_disable_single_step(struct task_struct *task) -{ - task->ptrace &= ~PT_SINGLESTEP; - ptrace_cancel_bpt(task); -} - -void user_enable_single_step(struct task_struct *task) -{ - task->ptrace |= PT_SINGLESTEP; -} - /* * Called by kernel/ptrace.c when detaching.. */ void ptrace_disable(struct task_struct *child) { - user_disable_single_step(child); + /* Nothing to do. */ } /* @@ -576,8 +197,6 @@ void ptrace_break(struct task_struct *tsk, struct pt_regs *regs) { siginfo_t info; - ptrace_cancel_bpt(tsk); - info.si_signo = SIGTRAP; info.si_errno = 0; info.si_code = TRAP_BRKPT; diff --git a/arch/arm/kernel/ptrace.h b/arch/arm/kernel/ptrace.h deleted file mode 100644 index 3926605b82ea..000000000000 --- a/arch/arm/kernel/ptrace.h +++ /dev/null @@ -1,37 +0,0 @@ -/* - * linux/arch/arm/kernel/ptrace.h - * - * Copyright (C) 2000-2003 Russell King - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include - -extern void ptrace_cancel_bpt(struct task_struct *); -extern void ptrace_set_bpt(struct task_struct *); -extern void ptrace_break(struct task_struct *, struct pt_regs *); - -/* - * Send SIGTRAP if we're single-stepping - */ -static inline void single_step_trap(struct task_struct *task) -{ - if (task->ptrace & PT_SINGLESTEP) { - ptrace_cancel_bpt(task); - send_sig(SIGTRAP, task, 1); - } -} - -static inline void single_step_clear(struct task_struct *task) -{ - if (task->ptrace & PT_SINGLESTEP) - ptrace_cancel_bpt(task); -} - -static inline void single_step_set(struct task_struct *task) -{ - if (task->ptrace & PT_SINGLESTEP) - ptrace_set_bpt(task); -} diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 907d5a620bca..7709668c4842 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -20,7 +20,6 @@ #include #include -#include "ptrace.h" #include "signal.h" #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) @@ -348,8 +347,6 @@ asmlinkage int sys_sigreturn(struct pt_regs *regs) if (restore_sigframe(regs, frame)) goto badframe; - single_step_trap(current); - return regs->ARM_r0; badframe: @@ -383,8 +380,6 @@ asmlinkage int sys_rt_sigreturn(struct pt_regs *regs) if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT) goto badframe; - single_step_trap(current); - return regs->ARM_r0; badframe: @@ -704,8 +699,6 @@ static void do_signal(struct pt_regs *regs, int syscall) if (try_to_freeze()) goto no_signal; - single_step_clear(current); - signr = get_signal_to_deliver(&info, &ka, regs, NULL); if (signr > 0) { sigset_t *oldset; @@ -724,7 +717,6 @@ static void do_signal(struct pt_regs *regs, int syscall) if (test_thread_flag(TIF_RESTORE_SIGMASK)) clear_thread_flag(TIF_RESTORE_SIGMASK); } - single_step_set(current); return; } @@ -770,7 +762,6 @@ static void do_signal(struct pt_regs *regs, int syscall) sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); } } - single_step_set(current); } asmlinkage void diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 7f53c3651c58..21ac43f1c2d0 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -32,7 +33,6 @@ #include #include -#include "ptrace.h" #include "signal.h" static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" }; -- cgit v1.2.1 From 6d7d0ae51574943bf571d269da3243257a2d15db Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Mon, 21 Feb 2011 07:06:45 +0100 Subject: ARM: 6750/1: improvements to compressed/head.S In the case of a conflict between the memory used by the compressed kernel with its decompressor code and the memory used for the decompressed kernel, we currently store the later after the former and relocate it afterwards. This would be more efficient to do this the other way around i.e. relocate the compressed data up front instead, resulting in a smaller copy. That also has the advantage of making the code smaller and more straight forward. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/boot/compressed/head.S | 239 ++++++++++++++++++---------------------- 1 file changed, 110 insertions(+), 129 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 920f4dbd4883..39859216af00 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -174,9 +174,7 @@ not_angel: */ .text - adr r0, LC0 - ldmia r0, {r1, r2, r3, r5, r6, r11, ip} - ldr sp, [r0, #28] + #ifdef CONFIG_AUTO_ZRELADDR @ determine final kernel image address mov r4, pc @@ -185,35 +183,108 @@ not_angel: #else ldr r4, =zreladdr #endif - subs r0, r0, r1 @ calculate the delta offset - @ if delta is zero, we are - beq not_relocated @ running at the address we - @ were linked at. + bl cache_on + +restart: adr r0, LC0 + ldmia r0, {r1, r2, r3, r5, r6, r9, r11, r12} + ldr sp, [r0, #32] + + /* + * We might be running at a different address. We need + * to fix up various pointers. + */ + sub r0, r0, r1 @ calculate the delta offset + add r5, r5, r0 @ _start + add r6, r6, r0 @ _edata +#ifndef CONFIG_ZBOOT_ROM + /* malloc space is above the relocated stack (64k max) */ + add sp, sp, r0 + add r10, sp, #0x10000 +#else /* - * We're running at a different address. We need to fix - * up various pointers: - * r5 - zImage base address (_start) - * r6 - size of decompressed image - * r11 - GOT start - * ip - GOT end + * With ZBOOT_ROM the bss/stack is non relocatable, + * but someone could still run this code from RAM, + * in which case our reference is _edata. */ - add r5, r5, r0 + mov r10, r6 +#endif + +/* + * Check to see if we will overwrite ourselves. + * r4 = final kernel address + * r5 = start of this image + * r9 = size of decompressed image + * r10 = end of this image, including bss/stack/malloc space if non XIP + * We basically want: + * r4 >= r10 -> OK + * r4 + image length <= r5 -> OK + */ + cmp r4, r10 + bhs wont_overwrite + add r10, r4, r9 + cmp r10, r5 + bls wont_overwrite + +/* + * Relocate ourselves past the end of the decompressed kernel. + * r5 = start of this image + * r6 = _edata + * r10 = end of the decompressed kernel + * Because we always copy ahead, we need to do it from the end and go + * backward in case the source and destination overlap. + */ + /* Round up to next 256-byte boundary. */ + add r10, r10, #256 + bic r10, r10, #255 + + sub r9, r6, r5 @ size to copy + add r9, r9, #31 @ rounded up to a multiple + bic r9, r9, #31 @ ... of 32 bytes + add r6, r9, r5 + add r9, r9, r10 + +1: ldmdb r6!, {r0 - r3, r10 - r12, lr} + cmp r6, r5 + stmdb r9!, {r0 - r3, r10 - r12, lr} + bhi 1b + + /* Preserve offset to relocated code. */ + sub r6, r9, r6 + + bl cache_clean_flush + + adr r0, BSYM(restart) + add r0, r0, r6 + mov pc, r0 + +wont_overwrite: +/* + * If delta is zero, we are running at the address we were linked at. + * r0 = delta + * r2 = BSS start + * r3 = BSS end + * r4 = kernel execution address + * r7 = architecture ID + * r8 = atags pointer + * r11 = GOT start + * r12 = GOT end + * sp = stack pointer + */ + teq r0, #0 + beq not_relocated add r11, r11, r0 - add ip, ip, r0 + add r12, r12, r0 #ifndef CONFIG_ZBOOT_ROM /* * If we're running fully PIC === CONFIG_ZBOOT_ROM = n, * we need to fix up pointers into the BSS region. - * r2 - BSS start - * r3 - BSS end - * sp - stack pointer + * Note that the stack pointer has already been fixed up. */ add r2, r2, r0 add r3, r3, r0 - add sp, sp, r0 /* * Relocate all entries in the GOT table. @@ -221,7 +292,7 @@ not_angel: 1: ldr r1, [r11, #0] @ relocate entries in the GOT add r1, r1, r0 @ table. This fixes up the str r1, [r11], #4 @ C references. - cmp r11, ip + cmp r11, r12 blo 1b #else @@ -234,7 +305,7 @@ not_angel: cmphs r3, r1 @ _end < entry addlo r1, r1, r0 @ table. This fixes up the str r1, [r11], #4 @ C references. - cmp r11, ip + cmp r11, r12 blo 1b #endif @@ -246,76 +317,24 @@ not_relocated: mov r0, #0 cmp r2, r3 blo 1b - /* - * The C runtime environment should now be setup - * sufficiently. Turn the cache on, set up some - * pointers, and start decompressing. - */ - bl cache_on - - mov r1, sp @ malloc space above stack - add r2, sp, #0x10000 @ 64k max - /* - * Check to see if we will overwrite ourselves. - * r4 = final kernel address - * r5 = start of this image - * r6 = size of decompressed image - * r2 = end of malloc space (and therefore this image) - * We basically want: - * r4 >= r2 -> OK - * r4 + image length <= r5 -> OK + * The C runtime environment should now be setup sufficiently. + * Set up some pointers, and start decompressing. + * r4 = kernel execution address + * r7 = architecture ID + * r8 = atags pointer */ - cmp r4, r2 - bhs wont_overwrite - add r0, r4, r6 - cmp r0, r5 - bls wont_overwrite - - mov r5, r2 @ decompress after malloc space - mov r0, r5 + mov r0, r4 + mov r1, sp @ malloc space above stack + add r2, sp, #0x10000 @ 64k max mov r3, r7 bl decompress_kernel - - add r0, r0, #127 + 128 @ alignment + stack - bic r0, r0, #127 @ align the kernel length -/* - * r0 = decompressed kernel length - * r1-r3 = unused - * r4 = kernel execution address - * r5 = decompressed kernel start - * r7 = architecture ID - * r8 = atags pointer - * r9-r12,r14 = corrupted - */ - add r1, r5, r0 @ end of decompressed kernel - adr r2, reloc_start - ldr r3, LC1 - add r3, r2, r3 -1: ldmia r2!, {r9 - r12, r14} @ copy relocation code - stmia r1!, {r9 - r12, r14} - ldmia r2!, {r9 - r12, r14} - stmia r1!, {r9 - r12, r14} - cmp r2, r3 - blo 1b - mov sp, r1 - add sp, sp, #128 @ relocate the stack - bl cache_clean_flush - ARM( add pc, r5, r0 ) @ call relocation code - THUMB( add r12, r5, r0 ) - THUMB( mov pc, r12 ) @ call relocation code - -/* - * We're not in danger of overwriting ourselves. Do this the simple way. - * - * r4 = kernel execution address - * r7 = architecture ID - */ -wont_overwrite: mov r0, r4 - mov r3, r7 - bl decompress_kernel - b call_kernel + bl cache_off + mov r0, #0 @ must be zero + mov r1, r7 @ restore architecture number + mov r2, r8 @ restore atags pointer + mov pc, r4 @ call kernel .align 2 .type LC0, #object @@ -323,11 +342,11 @@ LC0: .word LC0 @ r1 .word __bss_start @ r2 .word _end @ r3 .word _start @ r5 - .word _image_size @ r6 + .word _edata @ r6 + .word _image_size @ r9 .word _got_start @ r11 .word _got_end @ ip .word user_stack_end @ sp -LC1: .word reloc_end - reloc_start .size LC0, . - LC0 #ifdef CONFIG_ARCH_RPC @@ -353,7 +372,7 @@ params: ldr r0, =0x10000100 @ params_phys for RPC * On exit, * r0, r1, r2, r3, r9, r10, r12 corrupted * This routine must preserve: - * r4, r5, r6, r7, r8 + * r4, r7, r8 */ .align 5 cache_on: mov r3, #8 @ cache_on function @@ -550,43 +569,6 @@ __common_mmu_cache_on: sub pc, lr, r0, lsr #32 @ properly flush pipeline #endif -/* - * All code following this line is relocatable. It is relocated by - * the above code to the end of the decompressed kernel image and - * executed there. During this time, we have no stacks. - * - * r0 = decompressed kernel length - * r1-r3 = unused - * r4 = kernel execution address - * r5 = decompressed kernel start - * r7 = architecture ID - * r8 = atags pointer - * r9-r12,r14 = corrupted - */ - .align 5 -reloc_start: add r9, r5, r0 - sub r9, r9, #128 @ do not copy the stack - debug_reloc_start - mov r1, r4 -1: - .rept 4 - ldmia r5!, {r0, r2, r3, r10 - r12, r14} @ relocate kernel - stmia r1!, {r0, r2, r3, r10 - r12, r14} - .endr - - cmp r5, r9 - blo 1b - mov sp, r1 - add sp, sp, #128 @ relocate the stack - debug_reloc_end - -call_kernel: bl cache_clean_flush - bl cache_off - mov r0, #0 @ must be zero - mov r1, r7 @ restore architecture number - mov r2, r8 @ restore atags pointer - mov pc, r4 @ call kernel - /* * Here follow the relocatable cache support functions for the * various processors. This is a generic hook for locating an @@ -791,7 +773,7 @@ proc_types: * On exit, * r0, r1, r2, r3, r9, r12 corrupted * This routine must preserve: - * r4, r6, r7 + * r4, r7, r8 */ .align 5 cache_off: mov r3, #12 @ cache_off function @@ -866,7 +848,7 @@ __armv3_mmu_cache_off: * On exit, * r1, r2, r3, r9, r10, r11, r12 corrupted * This routine must preserve: - * r0, r4, r5, r6, r7 + * r4, r6, r7, r8 */ .align 5 cache_clean_flush: @@ -1088,7 +1070,6 @@ memdump: mov r12, r0 #endif .ltorg -reloc_end: .align .section ".stack", "aw", %nobits -- cgit v1.2.1 From d239b1dc093d551046a909920b5310c1d1e308c1 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Mon, 21 Feb 2011 04:57:38 +0100 Subject: ARM: 6746/1: remove the 4x expansion presumption while decompressing the kernel We currently presume a 4x expansion to guess the decompressed kernel size in order to determine if the decompressed kernel is in conflict with the location where zImage is loaded. This guess may cause many issues by overestimating the final kernel image size: - This may force a needless relocation if the location of zImage was fine, wasting some precious microseconds of boot time. - The relocation may be located way too far, possibly overwriting the initrd image in RAM. - If the kernel image includes a large already-compressed initramfs image then the problem is even more exacerbated. And if by some strange means the 4x guess is too low then we may overwrite ourselves with the decompressed image. So let's use the exact decompressed kernel image size instead. For that we need to rely on the stat command, but this is hardly a new build dependency as the kernel already depends on many external commands to be built provided by the coreutils package where stat is found. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/boot/compressed/Makefile | 4 +++- arch/arm/boot/compressed/vmlinux.lds.in | 3 --- 2 files changed, 3 insertions(+), 4 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 0a8f748e506a..9d328be6e5e3 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -83,9 +83,11 @@ endif EXTRA_CFLAGS := -fpic -fno-builtin EXTRA_AFLAGS := -Wa,-march=all +# Provide size of uncompressed kernel to the decompressor via a linker symbol. +LDFLAGS_vmlinux := --defsym _image_size=$(shell stat -c "%s" $(obj)/../Image) # Supply ZRELADDR to the decompressor via a linker symbol. ifneq ($(CONFIG_AUTO_ZRELADDR),y) -LDFLAGS_vmlinux := --defsym zreladdr=$(ZRELADDR) +LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) endif ifeq ($(CONFIG_CPU_ENDIAN_BE8),y) LDFLAGS_vmlinux += --be8 diff --git a/arch/arm/boot/compressed/vmlinux.lds.in b/arch/arm/boot/compressed/vmlinux.lds.in index 366a924019ac..5309909d7282 100644 --- a/arch/arm/boot/compressed/vmlinux.lds.in +++ b/arch/arm/boot/compressed/vmlinux.lds.in @@ -43,9 +43,6 @@ SECTIONS _etext = .; - /* Assume size of decompressed image is 4x the compressed image */ - _image_size = (_etext - _text) * 4; - _got_start = .; .got : { *(.got) } _got_end = .; -- cgit v1.2.1 From 2839e06c95d12ada034cf9b63da60334c7c6358b Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Tue, 8 Mar 2011 06:59:54 +0100 Subject: ARM: 6795/1: l2x0: Errata fix for flush by Way operation can cause data corrupti PL310 implements the Clean & Invalidate by Way L2 cache maintenance operation (offset 0x7FC). This operation runs in background so that PL310 can handle normal accesses while it is in progress. Under very rare circumstances, due to this erratum, write data can be lost when PL310 treats a cacheable write transaction during a Clean & Invalidate by Way operation. Workaround: Disable Write-Back and Cache Linefill (Debug Control Register) Clean & Invalidate by Way (0x7FC) Re-enable Write-Back and Cache Linefill (Debug Control Register) This patch also removes any OMAP dependency on PL310 Errata's Signed-off-by: Santosh Shilimkar Acked-by: Catalin Marinas Signed-off-by: Russell King --- arch/arm/Kconfig | 15 ++++++++++++--- arch/arm/include/asm/outercache.h | 1 + arch/arm/mm/cache-l2x0.c | 32 ++++++++++++++++++-------------- 3 files changed, 31 insertions(+), 17 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 65ea7bb57c4d..ef41f7e39f69 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1135,7 +1135,7 @@ config ARM_ERRATA_742231 config PL310_ERRATA_588369 bool "Clean & Invalidate maintenance operations do not invalidate clean lines" - depends on CACHE_L2X0 && ARCH_OMAP4 + depends on CACHE_L2X0 help The PL310 L2 cache controller implements three types of Clean & Invalidate maintenance operations: by Physical Address @@ -1144,8 +1144,7 @@ config PL310_ERRATA_588369 clean operation followed immediately by an invalidate operation, both performing to the same memory location. This functionality is not correctly implemented in PL310 as clean lines are not - invalidated as a result of these operations. Note that this errata - uses Texas Instrument's secure monitor api. + invalidated as a result of these operations. config ARM_ERRATA_720789 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" @@ -1172,6 +1171,16 @@ config ARM_ERRATA_743622 visible impact on the overall performance or power consumption of the processor. +config PL310_ERRATA_727915 + bool "Background Clean & Invalidate by Way operation can cause data corruption" + depends on CACHE_L2X0 + help + PL310 implements the Clean & Invalidate by Way L2 cache maintenance + operation (offset 0x7FC). This operation runs in background so that + PL310 can handle normal accesses while it is in progress. Under very + rare circumstances, due to this erratum, write data can be lost when + PL310 treats a cacheable write transaction during a Clean & + Invalidate by Way operation. endmenu source "arch/arm/common/Kconfig" diff --git a/arch/arm/include/asm/outercache.h b/arch/arm/include/asm/outercache.h index fc1900925275..348d513afa92 100644 --- a/arch/arm/include/asm/outercache.h +++ b/arch/arm/include/asm/outercache.h @@ -31,6 +31,7 @@ struct outer_cache_fns { #ifdef CONFIG_OUTER_CACHE_SYNC void (*sync)(void); #endif + void (*set_debug)(unsigned long); }; #ifdef CONFIG_OUTER_CACHE diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index 170c9bb95866..803bce8845a7 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -67,18 +67,24 @@ static inline void l2x0_inv_line(unsigned long addr) writel_relaxed(addr, base + L2X0_INV_LINE_PA); } -#ifdef CONFIG_PL310_ERRATA_588369 -static void debug_writel(unsigned long val) -{ - extern void omap_smc1(u32 fn, u32 arg); +#if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915) - /* - * Texas Instrument secure monitor api to modify the - * PL310 Debug Control Register. - */ - omap_smc1(0x100, val); +#define debug_writel(val) outer_cache.set_debug(val) + +static void l2x0_set_debug(unsigned long val) +{ + writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL); } +#else +/* Optimised out for non-errata case */ +static inline void debug_writel(unsigned long val) +{ +} + +#define l2x0_set_debug NULL +#endif +#ifdef CONFIG_PL310_ERRATA_588369 static inline void l2x0_flush_line(unsigned long addr) { void __iomem *base = l2x0_base; @@ -91,11 +97,6 @@ static inline void l2x0_flush_line(unsigned long addr) } #else -/* Optimised out for non-errata case */ -static inline void debug_writel(unsigned long val) -{ -} - static inline void l2x0_flush_line(unsigned long addr) { void __iomem *base = l2x0_base; @@ -119,9 +120,11 @@ static void l2x0_flush_all(void) /* clean all ways */ spin_lock_irqsave(&l2x0_lock, flags); + debug_writel(0x03); writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY); cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask); cache_sync(); + debug_writel(0x00); spin_unlock_irqrestore(&l2x0_lock, flags); } @@ -329,6 +332,7 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask) outer_cache.flush_all = l2x0_flush_all; outer_cache.inv_all = l2x0_inv_all; outer_cache.disable = l2x0_disable; + outer_cache.set_debug = l2x0_set_debug; printk(KERN_INFO "%s cache controller enabled\n", type); printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n", -- cgit v1.2.1 From 4bdb157749a0da065e532f2f46040c178075b06f Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Tue, 22 Feb 2011 10:00:44 +0100 Subject: ARM: 6755/1: omap4: l2x0: Populate set_debug() function and enable Errata 727915 Populate the l2x0 set_debug function pointer with OMAP secure call and enable the PL310 Errata 727915 This patch has dependency on the earlier patch ARM: l2x0: Errata fix for flush by Way operation can cause data corruption Signed-off-by: Santosh Shilimkar Reviewed-by: Catalin Marinas Signed-off-by: Russell King --- arch/arm/mach-omap2/Kconfig | 1 + arch/arm/mach-omap2/omap4-common.c | 7 +++++++ 2 files changed, 8 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig index 1a2cf6226a55..b69fa0a0299e 100644 --- a/arch/arm/mach-omap2/Kconfig +++ b/arch/arm/mach-omap2/Kconfig @@ -45,6 +45,7 @@ config ARCH_OMAP4 select CPU_V7 select ARM_GIC select PL310_ERRATA_588369 + select PL310_ERRATA_727915 select ARM_ERRATA_720789 select ARCH_HAS_OPP select PM_OPP if PM diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c index 19268647ce36..9ef8c29dd817 100644 --- a/arch/arm/mach-omap2/omap4-common.c +++ b/arch/arm/mach-omap2/omap4-common.c @@ -52,6 +52,12 @@ static void omap4_l2x0_disable(void) omap_smc1(0x102, 0x0); } +static void omap4_l2x0_set_debug(unsigned long val) +{ + /* Program PL310 L2 Cache controller debug register */ + omap_smc1(0x100, val); +} + static int __init omap_l2_cache_init(void) { u32 aux_ctrl = 0; @@ -99,6 +105,7 @@ static int __init omap_l2_cache_init(void) * specific one */ outer_cache.disable = omap4_l2x0_disable; + outer_cache.set_debug = omap4_l2x0_set_debug; return 0; } -- cgit v1.2.1 From d7ed36a4ea84e3a850f9932e2058ceef987d1acd Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Wed, 2 Mar 2011 08:03:22 +0100 Subject: ARM: 6777/1: gic: Add hooks for architecture specific extensions Few architectures combine the GIC with an external interrupt controller. On such systems it may be necessary to update both the GIC registers and the external controller's registers to control IRQ behavior. This can be addressed in couple of possible methods. 1. Export common GIC routines along with 'struct irq_chip gic_chip' and allow architectures to have custom function by override. 2. Provide architecture specific function pointer hooks within GIC library and leave platforms to add the necessary code as part of these hooks. First one might be non-intrusive but have few shortcomings like arch needs to have there own custom gic library. Locks used should be common since it caters to same IRQs etc. Maintenance point of view also it leads to multiple file fixes. The second probably is cleaner and portable. It ensures that all the common GIC infrastructure is not touched and also provides archs to address their specific issue. Cc: Russell King Signed-off-by: Santosh Shilimkar Acked-by: Colin Cross Tested-by: Colin Cross Signed-off-by: Russell King --- arch/arm/common/gic.c | 47 +++++++++++++++++++++++++++++++++++++ arch/arm/include/asm/hardware/gic.h | 1 + 2 files changed, 48 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index e21c1f4218d3..cb6b041c39d2 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -44,6 +44,19 @@ struct gic_chip_data { void __iomem *cpu_base; }; +/* + * Supported arch specific GIC irq extension. + * Default make them NULL. + */ +struct irq_chip gic_arch_extn = { + .irq_ack = NULL, + .irq_mask = NULL, + .irq_unmask = NULL, + .irq_retrigger = NULL, + .irq_set_type = NULL, + .irq_set_wake = NULL, +}; + #ifndef MAX_GIC_NR #define MAX_GIC_NR 1 #endif @@ -74,6 +87,8 @@ static inline unsigned int gic_irq(struct irq_data *d) static void gic_ack_irq(struct irq_data *d) { spin_lock(&irq_controller_lock); + if (gic_arch_extn.irq_ack) + gic_arch_extn.irq_ack(d); writel(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI); spin_unlock(&irq_controller_lock); } @@ -84,6 +99,8 @@ static void gic_mask_irq(struct irq_data *d) spin_lock(&irq_controller_lock); writel(mask, gic_dist_base(d) + GIC_DIST_ENABLE_CLEAR + (gic_irq(d) / 32) * 4); + if (gic_arch_extn.irq_mask) + gic_arch_extn.irq_mask(d); spin_unlock(&irq_controller_lock); } @@ -92,6 +109,8 @@ static void gic_unmask_irq(struct irq_data *d) u32 mask = 1 << (d->irq % 32); spin_lock(&irq_controller_lock); + if (gic_arch_extn.irq_unmask) + gic_arch_extn.irq_unmask(d); writel(mask, gic_dist_base(d) + GIC_DIST_ENABLE_SET + (gic_irq(d) / 32) * 4); spin_unlock(&irq_controller_lock); } @@ -116,6 +135,9 @@ static int gic_set_type(struct irq_data *d, unsigned int type) spin_lock(&irq_controller_lock); + if (gic_arch_extn.irq_set_type) + gic_arch_extn.irq_set_type(d, type); + val = readl(base + GIC_DIST_CONFIG + confoff); if (type == IRQ_TYPE_LEVEL_HIGH) val &= ~confmask; @@ -141,6 +163,14 @@ static int gic_set_type(struct irq_data *d, unsigned int type) return 0; } +static int gic_retrigger(struct irq_data *d) +{ + if (gic_arch_extn.irq_retrigger) + return gic_arch_extn.irq_retrigger(d); + + return -ENXIO; +} + #ifdef CONFIG_SMP static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, bool force) @@ -166,6 +196,21 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, } #endif +#ifdef CONFIG_PM +static int gic_set_wake(struct irq_data *d, unsigned int on) +{ + int ret = -ENXIO; + + if (gic_arch_extn.irq_set_wake) + ret = gic_arch_extn.irq_set_wake(d, on); + + return ret; +} + +#else +#define gic_set_wake NULL +#endif + static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) { struct gic_chip_data *chip_data = get_irq_data(irq); @@ -201,9 +246,11 @@ static struct irq_chip gic_chip = { .irq_mask = gic_mask_irq, .irq_unmask = gic_unmask_irq, .irq_set_type = gic_set_type, + .irq_retrigger = gic_retrigger, #ifdef CONFIG_SMP .irq_set_affinity = gic_set_affinity, #endif + .irq_set_wake = gic_set_wake, }; void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq) diff --git a/arch/arm/include/asm/hardware/gic.h b/arch/arm/include/asm/hardware/gic.h index 84557d321001..0691f9dcc500 100644 --- a/arch/arm/include/asm/hardware/gic.h +++ b/arch/arm/include/asm/hardware/gic.h @@ -34,6 +34,7 @@ #ifndef __ASSEMBLY__ extern void __iomem *gic_cpu_base_addr; +extern struct irq_chip gic_arch_extn; void gic_init(unsigned int, unsigned int, void __iomem *, void __iomem *); void gic_secondary_init(unsigned int); -- cgit v1.2.1 From 1cf7cf06c92ba46ac0e0654ad8aad4c93ae412db Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Wed, 2 Mar 2011 18:08:55 +0100 Subject: ARM: 6778/1: compressed/head.S: make LDFLAGS_vmlinux into a recursively expanded variable The simply expanded variable may be evaluated before the target file for the stat command is up to date or even exists. Switching to a recursively expanded variable move the execution of the stat command to the location where LDFLAGS_vmlinux is actually used, fixing the dependency issue introduced by patch #6746/1. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/boot/compressed/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm') diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 9d328be6e5e3..3c0c68ff6a80 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -84,7 +84,7 @@ EXTRA_CFLAGS := -fpic -fno-builtin EXTRA_AFLAGS := -Wa,-march=all # Provide size of uncompressed kernel to the decompressor via a linker symbol. -LDFLAGS_vmlinux := --defsym _image_size=$(shell stat -c "%s" $(obj)/../Image) +LDFLAGS_vmlinux = --defsym _image_size=$(shell stat -c "%s" $(obj)/../Image) # Supply ZRELADDR to the decompressor via a linker symbol. ifneq ($(CONFIG_AUTO_ZRELADDR),y) LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR) -- cgit v1.2.1 From bf9dd36091695f1138a98b6ae85d565e60635545 Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Fri, 4 Mar 2011 23:51:59 +0100 Subject: ARM: 6786/1: enable CONFIG_KTIME_SCALAR Use straight 64-bit values as 64-bit operations are fairly efficient on ARM. Comparing the asm output with and without KTIME_SCALAR, using 64-bit math generates clearly better code. Comparing kernel/hrtimer.c .text size, it goes from 0x1414 to 0x119c with this change. Signed-off-by: Rob Herring Signed-off-by: Russell King --- arch/arm/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ef41f7e39f69..2fec7073f687 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -63,6 +63,10 @@ config GENERIC_CLOCKEVENTS_BROADCAST depends on GENERIC_CLOCKEVENTS default y if SMP +config KTIME_SCALAR + bool + default y + config HAVE_TCM bool select GENERIC_ALLOCATOR -- cgit v1.2.1 From 6fa85e5ce311a8c57fe32cb6403961f7a897112d Mon Sep 17 00:00:00 2001 From: Stepan Moskovchenko Date: Thu, 10 Mar 2011 05:12:25 +0100 Subject: ARM: 6796/1: Footbridge: Fix I/O mappings for NOMMU mode Use the correct I/O address definitions for Footbridge peripherals when the kernel is compiled without MMU support. Signed-off-by: Stepan Moskovchenko Signed-off-by: Russell King --- arch/arm/mach-footbridge/include/mach/hardware.h | 21 ++++++++++++++------- arch/arm/mach-footbridge/include/mach/io.h | 10 ++++++++-- 2 files changed, 22 insertions(+), 9 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/mach-footbridge/include/mach/hardware.h b/arch/arm/mach-footbridge/include/mach/hardware.h index 51dd902043ad..b6fdf23ecf6c 100644 --- a/arch/arm/mach-footbridge/include/mach/hardware.h +++ b/arch/arm/mach-footbridge/include/mach/hardware.h @@ -23,26 +23,33 @@ * 0xf9000000 0x50000000 1MB Cache flush * 0xf0000000 0x80000000 16MB ISA memory */ + +#ifdef CONFIG_MMU +#define MMU_IO(a, b) (a) +#else +#define MMU_IO(a, b) (b) +#endif + #define XBUS_SIZE 0x00100000 -#define XBUS_BASE 0xff800000 +#define XBUS_BASE MMU_IO(0xff800000, 0x40000000) #define ARMCSR_SIZE 0x00100000 -#define ARMCSR_BASE 0xfe000000 +#define ARMCSR_BASE MMU_IO(0xfe000000, 0x42000000) #define WFLUSH_SIZE 0x00100000 -#define WFLUSH_BASE 0xfd000000 +#define WFLUSH_BASE MMU_IO(0xfd000000, 0x78000000) #define PCIIACK_SIZE 0x00100000 -#define PCIIACK_BASE 0xfc000000 +#define PCIIACK_BASE MMU_IO(0xfc000000, 0x79000000) #define PCICFG1_SIZE 0x01000000 -#define PCICFG1_BASE 0xfb000000 +#define PCICFG1_BASE MMU_IO(0xfb000000, 0x7a000000) #define PCICFG0_SIZE 0x01000000 -#define PCICFG0_BASE 0xfa000000 +#define PCICFG0_BASE MMU_IO(0xfa000000, 0x7b000000) #define PCIMEM_SIZE 0x01000000 -#define PCIMEM_BASE 0xf0000000 +#define PCIMEM_BASE MMU_IO(0xf0000000, 0x80000000) #define XBUS_LEDS ((volatile unsigned char *)(XBUS_BASE + 0x12000)) #define XBUS_LED_AMBER (1 << 0) diff --git a/arch/arm/mach-footbridge/include/mach/io.h b/arch/arm/mach-footbridge/include/mach/io.h index 101a4fe90bde..32e4cc397c28 100644 --- a/arch/arm/mach-footbridge/include/mach/io.h +++ b/arch/arm/mach-footbridge/include/mach/io.h @@ -14,8 +14,14 @@ #ifndef __ASM_ARM_ARCH_IO_H #define __ASM_ARM_ARCH_IO_H -#define PCIO_SIZE 0x00100000 -#define PCIO_BASE 0xff000000 +#ifdef CONFIG_MMU +#define MMU_IO(a, b) (a) +#else +#define MMU_IO(a, b) (b) +#endif + +#define PCIO_SIZE 0x00100000 +#define PCIO_BASE MMU_IO(0xff000000, 0x7c000000) #define IO_SPACE_LIMIT 0xffff -- cgit v1.2.1 From 23bfdacf4eb525ff3404161429cedaa281c23e47 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Thu, 10 Mar 2011 14:03:01 +0100 Subject: ARM: 6798/1: aout-core: zero thread debug registers in a.out core dump The removal of the single-step emulation from ptrace on ARM means that thread_struct no longer has software breakpoint fields in its debug member. This patch fixes the a.out core dump code so that the debug registers are zeroed rather than trying to copy from non-existent fields. Cc: Nicolas Pitre Signed-off-by: Bryan Wu Signed-off-by: Will Deacon Signed-off-by: Russell King --- arch/arm/include/asm/a.out-core.h | 6 +----- arch/arm/include/asm/user.h | 2 +- 2 files changed, 2 insertions(+), 6 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/a.out-core.h b/arch/arm/include/asm/a.out-core.h index 93d04acaa31f..92f10cb5c70c 100644 --- a/arch/arm/include/asm/a.out-core.h +++ b/arch/arm/include/asm/a.out-core.h @@ -32,11 +32,7 @@ static inline void aout_dump_thread(struct pt_regs *regs, struct user *dump) dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT; dump->u_ssize = 0; - dump->u_debugreg[0] = tsk->thread.debug.bp[0].address; - dump->u_debugreg[1] = tsk->thread.debug.bp[1].address; - dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn.arm; - dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn.arm; - dump->u_debugreg[4] = tsk->thread.debug.nsaved; + memset(dump->u_debugreg, 0, sizeof(dump->u_debugreg)); if (dump->start_stack < 0x04000000) dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT; diff --git a/arch/arm/include/asm/user.h b/arch/arm/include/asm/user.h index 05ac4b06876a..35917b3a97f9 100644 --- a/arch/arm/include/asm/user.h +++ b/arch/arm/include/asm/user.h @@ -71,7 +71,7 @@ struct user{ /* the registers. */ unsigned long magic; /* To uniquely identify a core file */ char u_comm[32]; /* User command that was responsible */ - int u_debugreg[8]; + int u_debugreg[8]; /* No longer used */ struct user_fp u_fp; /* FP state */ struct user_fp_struct * u_fp0;/* Used by gdb to help find the values for */ /* the FP registers. */ -- cgit v1.2.1 From 6f685c5cdd29649cf8cc8f57c72791159f936e07 Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Thu, 3 Mar 2011 11:41:12 +0100 Subject: ARM: 6781/1: Thumb-2: Work around buggy Thumb-2 short branch relocations in gas Various binutils versions can resolve Thumb-2 branches to locally-defined, preemptible global symbols as short-range "b.n" branch instructions. This is a problem, because there's no guarantee the final destination of the symbol, or any candidate locations for a trampoline, are within range of the branch. For this reason, the kernel does not support fixing up the R_ARM_THM_JUMP11 (102) relocation in modules at all, and it makes little sense to add support. The symptom is that the kernel fails with an "unsupported relocation" error when loading some modules. Until fixed tools are available, passing -fno-optimize-sibling-calls to gcc should prevent gcc generating code which hits this problem, at the cost of a bit of extra runtime stack usage in some cases. The problem is described in more detail at: https://bugs.launchpad.net/binutils-linaro/+bug/725126 Only Thumb-2 kernels are affected. This patch adds a new CONFIG_THUMB2_AVOID_R_ARM_THM_JUMP11 config option which adds -fno-optimize-sibling-calls to CFLAGS_MODULE when building a Thumb-2 kernel. Signed-off-by: Dave Martin Acked-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/Kconfig | 31 +++++++++++++++++++++++++++++++ arch/arm/Makefile | 4 ++++ 2 files changed, 35 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 2fec7073f687..f871f2e1dd7c 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1379,6 +1379,37 @@ config THUMB2_KERNEL If unsure, say N. +config THUMB2_AVOID_R_ARM_THM_JUMP11 + bool "Work around buggy Thumb-2 short branch relocations in gas" + depends on THUMB2_KERNEL && MODULES + default y + help + Various binutils versions can resolve Thumb-2 branches to + locally-defined, preemptible global symbols as short-range "b.n" + branch instructions. + + This is a problem, because there's no guarantee the final + destination of the symbol, or any candidate locations for a + trampoline, are within range of the branch. For this reason, the + kernel does not support fixing up the R_ARM_THM_JUMP11 (102) + relocation in modules at all, and it makes little sense to add + support. + + The symptom is that the kernel fails with an "unsupported + relocation" error when loading some modules. + + Until fixed tools are available, passing + -fno-optimize-sibling-calls to gcc should prevent gcc generating + code which hits this problem, at the cost of a bit of extra runtime + stack usage in some cases. + + The problem is described in more detail at: + https://bugs.launchpad.net/binutils-linaro/+bug/725126 + + Only Thumb-2 kernels are affected. + + Unless you are sure your tools don't have this problem, say Y. + config ARM_ASM_UNIFIED bool diff --git a/arch/arm/Makefile b/arch/arm/Makefile index da525bc96145..6d611f407ce6 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -105,6 +105,10 @@ AFLAGS_AUTOIT :=$(call as-option,-Wa$(comma)-mimplicit-it=always,-Wa$(comma)-mau AFLAGS_NOWARN :=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W) CFLAGS_THUMB2 :=-mthumb $(AFLAGS_AUTOIT) $(AFLAGS_NOWARN) AFLAGS_THUMB2 :=$(CFLAGS_THUMB2) -Wa$(comma)-mthumb +# Work around buggy relocation from gas if requested: +ifeq ($(CONFIG_THUMB2_AVOID_R_ARM_THM_JUMP11),y) +CFLAGS_MODULE +=-fno-optimize-sibling-calls +endif endif # Need -Uarm for gcc < 3.x -- cgit v1.2.1 From 10a8c3839810ac9af1aec836d61b92e7a879f5fa Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Mon, 14 Mar 2011 14:00:30 +0100 Subject: ARM: 6806/1: irq: introduce entry and exit functions for chained handlers Some chained IRQ handlers are written to cope with primary chips of potentially different flow types. Whether this a sensible thing to do is a point of contention. This patch introduces entry/exit functions for chained handlers which infer the flow type of the primary chip as fasteoi or level-type by checking whether or not the ->irq_eoi function pointer is present and calling back to the primary chip as necessary. Other methods of flow control are not considered. Acked-by: Thomas Gleixner Acked-by: Catalin Marinas Signed-off-by: Will Deacon Signed-off-by: Russell King --- arch/arm/include/asm/mach/irq.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/mach/irq.h b/arch/arm/include/asm/mach/irq.h index 22ac140edd9e..febe495d0c6e 100644 --- a/arch/arm/include/asm/mach/irq.h +++ b/arch/arm/include/asm/mach/irq.h @@ -34,4 +34,35 @@ do { \ raw_spin_unlock(&desc->lock); \ } while(0) +#ifndef __ASSEMBLY__ +/* + * Entry/exit functions for chained handlers where the primary IRQ chip + * may implement either fasteoi or level-trigger flow control. + */ +static inline void chained_irq_enter(struct irq_chip *chip, + struct irq_desc *desc) +{ + /* FastEOI controllers require no action on entry. */ + if (chip->irq_eoi) + return; + + if (chip->irq_mask_ack) { + chip->irq_mask_ack(&desc->irq_data); + } else { + chip->irq_mask(&desc->irq_data); + if (chip->irq_ack) + chip->irq_ack(&desc->irq_data); + } +} + +static inline void chained_irq_exit(struct irq_chip *chip, + struct irq_desc *desc) +{ + if (chip->irq_eoi) + chip->irq_eoi(&desc->irq_data); + else + chip->irq_unmask(&desc->irq_data); +} +#endif + #endif -- cgit v1.2.1