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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/s390/include/asm/idals.h
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/s390/include/asm/idals.h')
-rw-r--r--arch/s390/include/asm/idals.h249
1 files changed, 249 insertions, 0 deletions
diff --git a/arch/s390/include/asm/idals.h b/arch/s390/include/asm/idals.h
new file mode 100644
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--- /dev/null
+++ b/arch/s390/include/asm/idals.h
@@ -0,0 +1,249 @@
+/*
+ * 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)
+{
+ return ((__pa(vaddr) & (IDA_BLOCK_SIZE-1)) + length +
+ (IDA_BLOCK_SIZE-1)) >> IDA_SIZE_LOG;
+}
+
+/*
+ * 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)
+{
+ 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;
+ }
+ 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