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[SPARC64]: Eliminate PCI IOMMU dma mapping size limit.

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The hairy fast allocator in the sparc64 PCI IOMMU code
has a hard limit of 256 pages.  Certain devices can
exceed this when performing very large I/Os.

So replace with a more simple allocator, based largely
upon the arch/ppc64/kernel/iommu.c code.

Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David S. Miller 2005-10-13 22:15:24 -07:00
commit 688cb30bdc
2 changed files with 145 additions and 248 deletions
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28
include/asm-sparc64/pbm.h
View file

@ -27,23 +27,27 @@
* PCI bus.
*/
#define PBM_LOGCLUSTERS 3
#define PBM_NCLUSTERS (1 << PBM_LOGCLUSTERS)
struct pci_controller_info;
/* This contains the software state necessary to drive a PCI
* controller's IOMMU.
*/
struct pci_iommu_arena {
unsigned long *map;
unsigned int hint;
unsigned int limit;
};
struct pci_iommu {
/* This protects the controller's IOMMU and all
* streaming buffers underneath.
*/
spinlock_t lock;
struct pci_iommu_arena arena;
/* IOMMU page table, a linear array of ioptes. */
iopte_t *page_table; /* The page table itself. */
int page_table_sz_bits; /* log2 of ow many pages does it map? */
/* Base PCI memory space address where IOMMU mappings
* begin.
@ -62,12 +66,6 @@ struct pci_iommu {
*/
unsigned long write_complete_reg;
/* The lowest used consistent mapping entry. Since
* we allocate consistent maps out of cluster 0 this
* is relative to the beginning of closter 0.
*/
u32 lowest_consistent_map;
/* In order to deal with some buggy third-party PCI bridges that
* do wrong prefetching, we never mark valid mappings as invalid.
* Instead we point them at this dummy page.
@ -75,16 +73,6 @@ struct pci_iommu {
unsigned long dummy_page;
unsigned long dummy_page_pa;
/* If PBM_NCLUSTERS is ever decreased to 4 or lower,
* or if largest supported page_table_sz * 8K goes above
* 2GB, you must increase the size of the type of
* these counters. You have been duly warned. -DaveM
*/
struct {
u16 next;
u16 flush;
} alloc_info[PBM_NCLUSTERS];
/* CTX allocation. */
unsigned long ctx_lowest_free;
unsigned long ctx_bitmap[IOMMU_NUM_CTXS / (sizeof(unsigned long) * 8)];