request_resource_conflict – request and reserve an I/O or memory resource Synopsis struct resource *request_resource_conflict(struct resource *root, struct resource *new); Arguments root root resource descriptor new resource descriptor desired by caller Description Returns 0 for success, conflict resource on error. Copyright
request_resource – request and reserve an I/O or memory resource Synopsis int request_resource(struct resource *root, struct resource *new); Arguments root root resource descriptor new resource descriptor desired by caller Description Returns 0 for success, negative error code on error. Copyright
request_percpu_irq – allocate a percpu interrupt line Synopsis int request_percpu_irq(unsigned int irq, irq_handler_t handler, const char *devname, void __percpu *dev_id); Arguments irq Interrupt line to allocate handler Function to be called when the IRQ occurs. devname An ascii name for the claiming device dev_id A percpu cookie passed back to the handler function Description This…
request_dma – request and reserve a system DMA channel Synopsis int request_dma(unsigned int dmanr, const char *device_id); Arguments dmanr DMA channel number device_id reserving device ID string, used in /proc/dma Copyright
request_any_context_irq – allocate an interrupt line Synopsis int request_any_context_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, const char *name, void *dev_id); Arguments irq Interrupt line to allocate handler Function to be called when the IRQ occurs. Threaded handler for threaded interrupts. flags Interrupt type flags name An ascii name for the claiming device dev_id A…
replace_page_cache_page – replace a pagecache page with a new one Synopsis int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask); Arguments old page to be replaced new page to replace with gfp_mask allocation mode Description This function replaces a page in the pagecache with a new one. On success it acquires the pagecache reference for…
remove_resource – Remove a resource in the resource tree Synopsis int remove_resource(struct resource *old); Arguments old resource to remove Description Returns 0 on success, -EINVAL if the resource is not valid. This function removes a resource previously inserted by insert_resource or insert_resource_conflict, and moves the children (if any) up to where they were before. insert_resource…
remove_irq – free an interrupt Synopsis void remove_irq(unsigned int irq, struct irqaction *act); Arguments irq Interrupt line to free act irqaction for the interrupt Description Used to remove interrupts statically setup by the early boot process. Copyright
remap_vmalloc_range_partial – map vmalloc pages to userspace Synopsis int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr, void *kaddr, unsigned long size); Arguments vma vma to cover uaddr target user address to start at kaddr virtual address of vmalloc kernel memory size size of map area Return 0 for success, -Exxx on failure This function checks that…
remap_vmalloc_range – map vmalloc pages to userspace Synopsis int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff); Arguments vma vma to cover (map full range of vma) addr vmalloc memory pgoff number of pages into addr before first page to map Return 0 for success, -Exxx on failure This function checks that addr is a…
remap_pfn_range – remap kernel memory to userspace Synopsis int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t prot); Arguments vma user vma to map to addr target user address to start at pfn physical address of kernel memory size size of map area prot page protection flags for this mapping…
release_resource – release a previously reserved resource Synopsis int release_resource(struct resource *old); Arguments old resource pointer Copyright
release_mem_region_adjustable – release a previously reserved memory region Synopsis int release_mem_region_adjustable(struct resource *parent, resource_size_t start, resource_size_t size); Arguments parent parent resource descriptor start resource start address size resource region size Description This interface is intended for memory hot-delete. The requested region is released from a currently busy memory resource. The requested region must either match…
relay_switch_subbuf – switch to a new sub-buffer Synopsis size_t relay_switch_subbuf(struct rchan_buf *buf, size_t length); Arguments buf channel buffer length size of current event Description Returns either the length passed in or 0 if full. Performs sub-buffer-switch tasks such as invoking callbacks, updating padding counts, waking up readers, etc. Copyright
relay_subbufs_consumed – update the buffer’s sub-buffers-consumed count Synopsis void relay_subbufs_consumed(struct rchan *chan, unsigned int cpu, size_t subbufs_consumed); Arguments chan the channel cpu the cpu associated with the channel buffer to update subbufs_consumed number of sub-buffers to add to current buf’s count Description Adds to the channel buffer’s consumed sub-buffer count. subbufs_consumed should be the number…
relay_reset – reset the channel Synopsis void relay_reset(struct rchan *chan); Arguments chan the channel Description This has the effect of erasing all data from all channel buffers and restarting the channel in its initial state. The buffers are not freed, so any mappings are still in effect. NOTE. Care should be taken that the channel…
relay_remove_buf – remove a channel buffer Synopsis void relay_remove_buf(struct kref *kref); Arguments kref target kernel reference that contains the relay buffer Description Removes the file from the filesystem, which also frees the rchan_buf_struct and the channel buffer. Should only be called from kref_put. Copyright
relay_open – create a new relay channel Synopsis struct rchan *relay_open(const char *base_filename, struct dentry *parent, size_t subbuf_size, size_t n_subbufs, struct rchan_callbacks *cb, void *private_data); Arguments base_filename base name of files to create, NULL for buffering only parent dentry of parent directory, NULL for root directory or buffer subbuf_size size of sub-buffers n_subbufs number of…
relay_mmap_buf – mmap channel buffer to process address space Synopsis int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma); Arguments buf relay channel buffer vma vm_area_struct describing memory to be mapped Description Returns 0 if ok, negative on error Caller should already have grabbed mmap_sem. Copyright
relay_late_setup_files – triggers file creation Synopsis int relay_late_setup_files(struct rchan *chan, const char *base_filename, struct dentry *parent); Arguments chan channel to operate on base_filename base name of files to create parent dentry of parent directory, NULL for root directory Description Returns 0 if successful, non-zero otherwise. Use to setup files for a previously buffer-only channel created…