From 0ec67667ab414b18a0518d5b11c842fd342e9cb1 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 12 Feb 2007 15:47:04 +0100 Subject: [PATCH 1/4] [S390] smp_call_function/smp_call_function_on locking. smp_call_function and smp_call_function_on share the same lock and smp_call_function_on disables softirq's so it can be called from softirq context as well. Hence smp_call_function muss disable softirqs as well to avoid deadlocks. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/smp.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 65b52320d145..83a4ea6e3d60 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -57,7 +57,7 @@ static void smp_ext_bitcall(int, ec_bit_sig); static void smp_ext_bitcall_others(ec_bit_sig); /* -5B * Structure and data for smp_call_function(). This is designed to minimise + * Structure and data for smp_call_function(). This is designed to minimise * static memory requirements. It also looks cleaner. */ static DEFINE_SPINLOCK(call_lock); @@ -104,7 +104,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic, * remote CPUs are nearly ready to execute <> or are or have executed. * * You must not call this function with disabled interrupts or from a - * hardware interrupt handler or from a bottom half handler. + * hardware interrupt handler. */ { struct call_data_struct data; @@ -113,8 +113,8 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic, if (cpus <= 0) return 0; - /* Can deadlock when called with interrupts disabled */ - WARN_ON(irqs_disabled()); + /* Can deadlock when interrupts are disabled or if in wrong context */ + WARN_ON(irqs_disabled() || in_irq()); data.func = func; data.info = info; @@ -123,7 +123,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic, if (wait) atomic_set(&data.finished, 0); - spin_lock(&call_lock); + spin_lock_bh(&call_lock); call_data = &data; /* Send a message to all other CPUs and wait for them to respond */ smp_ext_bitcall_others(ec_call_function); @@ -135,7 +135,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic, if (wait) while (atomic_read(&data.finished) != cpus) cpu_relax(); - spin_unlock(&call_lock); + spin_unlock_bh(&call_lock); return 0; } @@ -159,6 +159,9 @@ int smp_call_function_on(void (*func) (void *info), void *info, if (!cpu_online(cpu)) return -EINVAL; + /* Can deadlock when interrupts are disabled or if in wrong context */ + WARN_ON(irqs_disabled() || in_irq()); + /* disable preemption for local function call */ curr_cpu = get_cpu(); From 4dd3cc5caf41d55cd5e55f32902c8a2ad3296e19 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Mon, 12 Feb 2007 15:47:18 +0100 Subject: [PATCH 2/4] [S390] cio: Fixup interface for setting options on ccw devices. The current ccw_device_set_options() sets a specified mask of options and clears those not specified, but there is no way to find out which options have already been set. In order to fix this up, introduce the following interface changes: ccw_device_set_options() now only sets the specified bits, but does not clear those that are not specified. ccw_device_clear_options() clears the specified bits. ccw_device_set_options_mask() provides the old semantics (setting only the specified bits and clearing the others). Device drivers now work as expected. qdio has been adapted. Signed-off-by: Cornelia Huck Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/device_ops.c | 32 ++++++++++++++++++++++++++++++-- drivers/s390/cio/qdio.c | 2 +- include/asm-s390/ccwdev.h | 2 ++ 3 files changed, 33 insertions(+), 3 deletions(-) diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c index d7b25b8f71d2..7c7775aae38a 100644 --- a/drivers/s390/cio/device_ops.c +++ b/drivers/s390/cio/device_ops.c @@ -23,8 +23,7 @@ #include "chsc.h" #include "device.h" -int -ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) +int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags) { /* * The flag usage is mutal exclusive ... @@ -39,6 +38,33 @@ ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) return 0; } +int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) +{ + /* + * The flag usage is mutal exclusive ... + */ + if (((flags & CCWDEV_EARLY_NOTIFICATION) && + (flags & CCWDEV_REPORT_ALL)) || + ((flags & CCWDEV_EARLY_NOTIFICATION) && + cdev->private->options.repall) || + ((flags & CCWDEV_REPORT_ALL) && + cdev->private->options.fast)) + return -EINVAL; + cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0; + cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0; + cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0; + cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0; + return 0; +} + +void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags) +{ + cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0; + cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0; + cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0; + cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0; +} + int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm) { @@ -601,7 +627,9 @@ _ccw_device_get_device_number(struct ccw_device *cdev) MODULE_LICENSE("GPL"); +EXPORT_SYMBOL(ccw_device_set_options_mask); EXPORT_SYMBOL(ccw_device_set_options); +EXPORT_SYMBOL(ccw_device_clear_options); EXPORT_SYMBOL(ccw_device_clear); EXPORT_SYMBOL(ccw_device_halt); EXPORT_SYMBOL(ccw_device_resume); diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c index d726cd5777de..5b1e3ff26c0b 100644 --- a/drivers/s390/cio/qdio.c +++ b/drivers/s390/cio/qdio.c @@ -3194,7 +3194,7 @@ qdio_establish(struct qdio_initialize *init_data) spin_lock_irqsave(get_ccwdev_lock(cdev),saveflags); - ccw_device_set_options(cdev, 0); + ccw_device_set_options_mask(cdev, 0); result=ccw_device_start_timeout(cdev,&irq_ptr->ccw, QDIO_DOING_ESTABLISH,0, 0, QDIO_ESTABLISH_TIMEOUT); diff --git a/include/asm-s390/ccwdev.h b/include/asm-s390/ccwdev.h index 58c70acffc73..cfc81533b9ba 100644 --- a/include/asm-s390/ccwdev.h +++ b/include/asm-s390/ccwdev.h @@ -110,7 +110,9 @@ extern void ccw_driver_unregister (struct ccw_driver *driver); struct ccw1; +extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long); extern int ccw_device_set_options(struct ccw_device *, unsigned long); +extern void ccw_device_clear_options(struct ccw_device *, unsigned long); /* Allow for i/o completion notification after primary interrupt status. */ #define CCWDEV_EARLY_NOTIFICATION 0x0001 From 045236ab190636c989ae8198eca37cfbafc1430b Mon Sep 17 00:00:00 2001 From: "Ahmed S. Darwish" Date: Mon, 12 Feb 2007 15:49:51 +0100 Subject: [PATCH 3/4] [S390] cio: use ARRAY_SIZE in device_id.c Acked-by: Cornelia Huck Signed-off-by: Ahmed S. Darwish Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/device_id.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c index f17275917fe5..997f46874537 100644 --- a/drivers/s390/cio/device_id.c +++ b/drivers/s390/cio/device_id.c @@ -11,6 +11,7 @@ #include #include +#include #include #include @@ -138,7 +139,7 @@ VM_virtual_device_info (__u16 devno, struct senseid *ps) ps->cu_model = 0x60; return; } - for (i = 0; i < sizeof(vm_devices) / sizeof(vm_devices[0]); i++) + for (i = 0; i < ARRAY_SIZE(vm_devices); i++) if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla && diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) { ps->cu_type = vm_devices[i].cu_type; From 022ae414daadb718130679e4eacc105521f11ec7 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 12 Feb 2007 15:49:57 +0100 Subject: [PATCH 4/4] [S390] remove __io_virt and mmiowb. Signed-off-by: Martin Schwidefsky --- include/asm-s390/io.h | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/include/asm-s390/io.h b/include/asm-s390/io.h index dca6a6cc103f..b7ff6afc3caa 100644 --- a/include/asm-s390/io.h +++ b/include/asm-s390/io.h @@ -17,8 +17,6 @@ #define IO_SPACE_LIMIT 0xffffffff -#define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x))) - /* * Change virtual addresses to physical addresses and vv. * These are pretty trivial @@ -37,11 +35,9 @@ static inline unsigned long virt_to_phys(volatile void * address) static inline void * phys_to_virt(unsigned long address) { - return __io_virt(address); + return (void *) address; } -#define mmiowb() do { } while (0) - /* * Convert a physical pointer to a virtual kernel pointer for /dev/mem * access