litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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author	FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>	2008-10-23 07:46:55 -0400
committer	Ingo Molnar <mingo@elte.hu>	2008-10-23 15:54:39 -0400
commit	75bebb7f0c2a709812cccb4d3151a21b012c5cad (patch)
tree	dd3a31038904e8b08e4b802830bbc3c746ef78d1 /tools
parent	a2b89b596c5a0b288adac84b17bdda6bde8d144e (diff)

x86: use GFP_DMA for 24bit coherent_dma_mask

dma_alloc_coherent (include/asm-x86/dma-mapping.h) avoids GFP_DMA allocation first and if the allocated address is not fit for the device's coherent_dma_mask, then dma_alloc_coherent does GFP_DMA allocation. This is because dma_alloc_coherent avoids precious GFP_DMA zone if possible. This is also how the old dma_alloc_coherent (arch/x86/kernel/pci-dma.c) works. However, if the coherent_dma_mask of a device is 24bit, there is no point to go into the above GFP_DMA retry mechanism. We had better use GFP_DMA in the first place. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Tested-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>

Diffstat (limited to 'tools')

0 files changed, 0 insertions, 0 deletions

uct file_operations; struct pt_regs; /* Operations structure to be filled in */ struct oprofile_operations { /* create any necessary configuration files in the oprofile fs. * Optional. */ int (*create_files)(struct super_block * sb, struct dentry * root); /* Do any necessary interrupt setup. Optional. */ int (*setup)(void); /* Do any necessary interrupt shutdown. Optional. */ void (*shutdown)(void); /* Start delivering interrupts. */ int (*start)(void); /* Stop delivering interrupts. */ void (*stop)(void); /* Arch-specific buffer sync functions. * Return value = 0: Success * Return value = -1: Failure * Return value = 1: Run generic sync function */ int (*sync_start)(void); int (*sync_stop)(void); /* Initiate a stack backtrace. Optional. */ void (*backtrace)(struct pt_regs * const regs, unsigned int depth); /* CPU identification string. */ char * cpu_type; }; /** * One-time initialisation. *ops must be set to a filled-in * operations structure. This is called even in timer interrupt * mode so an arch can set a backtrace callback. * * If an error occurs, the fields should be left untouched. */ int oprofile_arch_init(struct oprofile_operations * ops); /** * One-time exit/cleanup for the arch. */ void oprofile_arch_exit(void); /** * Add a sample. This may be called from any context. */ void oprofile_add_sample(struct pt_regs * const regs, unsigned long event); /** * Add an extended sample. Use this when the PC is not from the regs, and * we cannot determine if we're in kernel mode from the regs. * * This function does perform a backtrace. * */ void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs, unsigned long event, int is_kernel); /* Use this instead when the PC value is not from the regs. Doesn't * backtrace. */ void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event); /* add a backtrace entry, to be called from the ->backtrace callback */ void oprofile_add_trace(unsigned long eip); /** * Create a file of the given name as a child of the given root, with * the specified file operations. */ int oprofilefs_create_file(struct super_block * sb, struct dentry * root, char const * name, const struct file_operations * fops); int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root, char const * name, const struct file_operations * fops, int perm); /** Create a file for read/write access to an unsigned long. */ int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root, char const * name, ulong * val); /** Create a file for read-only access to an unsigned long. */ int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root, char const * name, ulong * val); /** Create a file for read-only access to an atomic_t. */ int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root, char const * name, atomic_t * val); /** create a directory */ struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root, char const * name); /** * Write the given asciz string to the given user buffer @buf, updating *offset * appropriately. Returns bytes written or -EFAULT. */ ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset); /** * Convert an unsigned long value into ASCII and copy it to the user buffer @buf, * updating *offset appropriately. Returns bytes written or -EFAULT. */ ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset); /** * Read an ASCII string for a number from a userspace buffer and fill *val on success. * Returns 0 on success, < 0 on error. */ int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count); /** lock for read/write safety */ extern spinlock_t oprofilefs_lock; /** * Add the contents of a circular buffer to the event buffer. */ void oprofile_put_buff(unsigned long *buf, unsigned int start, unsigned int stop, unsigned int max); unsigned long oprofile_get_cpu_buffer_size(void); void oprofile_cpu_buffer_inc_smpl_lost(void); /* cpu buffer functions */ struct op_sample; struct op_entry { struct ring_buffer_event *event; struct op_sample *sample; unsigned long irq_flags; unsigned long size; unsigned long *data; }; void oprofile_write_reserve(struct op_entry *entry, struct pt_regs * const regs, unsigned long pc, int code, int size); int oprofile_add_data(struct op_entry *entry, unsigned long val); int oprofile_write_commit(struct op_entry *entry); #endif /* OPROFILE_H */