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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-08-01 20:42:05 +0200 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-08-01 20:42:05 +0200 |
commit | c6557e7f2b6ae76a44653d38f835174074c42e05 (patch) | |
tree | da619a76b309cb1cd259d082af768a83cfcd6d52 /include/asm-s390/idals.h | |
parent | ab4227cb2d936886069ef1056c02500d05beb15d (diff) | |
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[S390] move include/asm-s390 to arch/s390/include/asm
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include/asm-s390/idals.h')
-rw-r--r-- | include/asm-s390/idals.h | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/include/asm-s390/idals.h b/include/asm-s390/idals.h deleted file mode 100644 index e82c10e..0000000 --- a/include/asm-s390/idals.h +++ /dev/null @@ -1,256 +0,0 @@ -/* - * File...........: linux/include/asm-s390x/idals.h - * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> - * Martin Schwidefsky <schwidefsky@de.ibm.com> - * Bugreports.to..: <Linux390@de.ibm.com> - * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000a - - * History of changes - * 07/24/00 new file - * 05/04/02 code restructuring. - */ - -#ifndef _S390_IDALS_H -#define _S390_IDALS_H - -#include <linux/errno.h> -#include <linux/err.h> -#include <linux/types.h> -#include <linux/slab.h> -#include <asm/cio.h> -#include <asm/uaccess.h> - -#ifdef __s390x__ -#define IDA_SIZE_LOG 12 /* 11 for 2k , 12 for 4k */ -#else -#define IDA_SIZE_LOG 11 /* 11 for 2k , 12 for 4k */ -#endif -#define IDA_BLOCK_SIZE (1L<<IDA_SIZE_LOG) - -/* - * Test if an address/length pair needs an idal list. - */ -static inline int -idal_is_needed(void *vaddr, unsigned int length) -{ -#ifdef __s390x__ - return ((__pa(vaddr) + length - 1) >> 31) != 0; -#else - return 0; -#endif -} - - -/* - * Return the number of idal words needed for an address/length pair. - */ -static inline unsigned int -idal_nr_words(void *vaddr, unsigned int length) -{ -#ifdef __s390x__ - if (idal_is_needed(vaddr, length)) - return ((__pa(vaddr) & (IDA_BLOCK_SIZE-1)) + length + - (IDA_BLOCK_SIZE-1)) >> IDA_SIZE_LOG; -#endif - return 0; -} - -/* - * Create the list of idal words for an address/length pair. - */ -static inline unsigned long * -idal_create_words(unsigned long *idaws, void *vaddr, unsigned int length) -{ -#ifdef __s390x__ - unsigned long paddr; - unsigned int cidaw; - - paddr = __pa(vaddr); - cidaw = ((paddr & (IDA_BLOCK_SIZE-1)) + length + - (IDA_BLOCK_SIZE-1)) >> IDA_SIZE_LOG; - *idaws++ = paddr; - paddr &= -IDA_BLOCK_SIZE; - while (--cidaw > 0) { - paddr += IDA_BLOCK_SIZE; - *idaws++ = paddr; - } -#endif - return idaws; -} - -/* - * Sets the address of the data in CCW. - * If necessary it allocates an IDAL and sets the appropriate flags. - */ -static inline int -set_normalized_cda(struct ccw1 * ccw, void *vaddr) -{ -#ifdef __s390x__ - unsigned int nridaws; - unsigned long *idal; - - if (ccw->flags & CCW_FLAG_IDA) - return -EINVAL; - nridaws = idal_nr_words(vaddr, ccw->count); - if (nridaws > 0) { - idal = kmalloc(nridaws * sizeof(unsigned long), - GFP_ATOMIC | GFP_DMA ); - if (idal == NULL) - return -ENOMEM; - idal_create_words(idal, vaddr, ccw->count); - ccw->flags |= CCW_FLAG_IDA; - vaddr = idal; - } -#endif - ccw->cda = (__u32)(unsigned long) vaddr; - return 0; -} - -/* - * Releases any allocated IDAL related to the CCW. - */ -static inline void -clear_normalized_cda(struct ccw1 * ccw) -{ -#ifdef __s390x__ - if (ccw->flags & CCW_FLAG_IDA) { - kfree((void *)(unsigned long) ccw->cda); - ccw->flags &= ~CCW_FLAG_IDA; - } -#endif - ccw->cda = 0; -} - -/* - * Idal buffer extension - */ -struct idal_buffer { - size_t size; - size_t page_order; - void *data[0]; -}; - -/* - * Allocate an idal buffer - */ -static inline struct idal_buffer * -idal_buffer_alloc(size_t size, int page_order) -{ - struct idal_buffer *ib; - int nr_chunks, nr_ptrs, i; - - nr_ptrs = (size + IDA_BLOCK_SIZE - 1) >> IDA_SIZE_LOG; - nr_chunks = (4096 << page_order) >> IDA_SIZE_LOG; - ib = kmalloc(sizeof(struct idal_buffer) + nr_ptrs*sizeof(void *), - GFP_DMA | GFP_KERNEL); - if (ib == NULL) - return ERR_PTR(-ENOMEM); - ib->size = size; - ib->page_order = page_order; - for (i = 0; i < nr_ptrs; i++) { - if ((i & (nr_chunks - 1)) != 0) { - ib->data[i] = ib->data[i-1] + IDA_BLOCK_SIZE; - continue; - } - ib->data[i] = (void *) - __get_free_pages(GFP_KERNEL, page_order); - if (ib->data[i] != NULL) - continue; - // Not enough memory - while (i >= nr_chunks) { - i -= nr_chunks; - free_pages((unsigned long) ib->data[i], - ib->page_order); - } - kfree(ib); - return ERR_PTR(-ENOMEM); - } - return ib; -} - -/* - * Free an idal buffer. - */ -static inline void -idal_buffer_free(struct idal_buffer *ib) -{ - int nr_chunks, nr_ptrs, i; - - nr_ptrs = (ib->size + IDA_BLOCK_SIZE - 1) >> IDA_SIZE_LOG; - nr_chunks = (4096 << ib->page_order) >> IDA_SIZE_LOG; - for (i = 0; i < nr_ptrs; i += nr_chunks) - free_pages((unsigned long) ib->data[i], ib->page_order); - kfree(ib); -} - -/* - * Test if a idal list is really needed. - */ -static inline int -__idal_buffer_is_needed(struct idal_buffer *ib) -{ -#ifdef __s390x__ - return ib->size > (4096ul << ib->page_order) || - idal_is_needed(ib->data[0], ib->size); -#else - return ib->size > (4096ul << ib->page_order); -#endif -} - -/* - * Set channel data address to idal buffer. - */ -static inline void -idal_buffer_set_cda(struct idal_buffer *ib, struct ccw1 *ccw) -{ - if (__idal_buffer_is_needed(ib)) { - // setup idals; - ccw->cda = (u32)(addr_t) ib->data; - ccw->flags |= CCW_FLAG_IDA; - } else - // we do not need idals - use direct addressing - ccw->cda = (u32)(addr_t) ib->data[0]; - ccw->count = ib->size; -} - -/* - * Copy count bytes from an idal buffer to user memory - */ -static inline size_t -idal_buffer_to_user(struct idal_buffer *ib, void __user *to, size_t count) -{ - size_t left; - int i; - - BUG_ON(count > ib->size); - for (i = 0; count > IDA_BLOCK_SIZE; i++) { - left = copy_to_user(to, ib->data[i], IDA_BLOCK_SIZE); - if (left) - return left + count - IDA_BLOCK_SIZE; - to = (void __user *) to + IDA_BLOCK_SIZE; - count -= IDA_BLOCK_SIZE; - } - return copy_to_user(to, ib->data[i], count); -} - -/* - * Copy count bytes from user memory to an idal buffer - */ -static inline size_t -idal_buffer_from_user(struct idal_buffer *ib, const void __user *from, size_t count) -{ - size_t left; - int i; - - BUG_ON(count > ib->size); - for (i = 0; count > IDA_BLOCK_SIZE; i++) { - left = copy_from_user(ib->data[i], from, IDA_BLOCK_SIZE); - if (left) - return left + count - IDA_BLOCK_SIZE; - from = (void __user *) from + IDA_BLOCK_SIZE; - count -= IDA_BLOCK_SIZE; - } - return copy_from_user(ib->data[i], from, count); -} - -#endif |