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Genericizing iova.[ch]

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I would like to potentially move the sparc64 IOMMU code over to using
the nice new drivers/pci/iova.[ch] code for free area management..

In order to do that we have to detach the IOMMU page size assumptions
which only really need to exist in the intel-iommu.[ch] code.

This patch attempts to implement that.

[akpm@linux-foundation.org: build fix]
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Miller 2008-02-06 01:36:23 -08:00 committed by Linus Torvalds
parent b1ed88b47f
commit f661197e0a
5 changed files with 23 additions and 20 deletions
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1
drivers/pci/dmar.c
View file

@ -26,6 +26,7 @@
#include <linux/pci.h>
#include <linux/dmar.h>
#include "iova.h"
#include "intel-iommu.h"
#undef PREFIX
#define PREFIX "DMAR:"

4
drivers/pci/intel-iommu.c
View file

@ -1088,7 +1088,7 @@ static void dmar_init_reserved_ranges(void)
int i;
u64 addr, size;
init_iova_domain(&reserved_iova_list);
init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
/* IOAPIC ranges shouldn't be accessed by DMA */
iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START),
@ -1142,7 +1142,7 @@ static int domain_init(struct dmar_domain *domain, int guest_width)
int adjust_width, agaw;
unsigned long sagaw;
init_iova_domain(&domain->iovad);
init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
spin_lock_init(&domain->mapping_lock);
domain_reserve_special_ranges(domain);

14
drivers/pci/intel-iommu.h
View file

@ -23,9 +23,23 @@
#include <linux/types.h>
#include <linux/msi.h>
#include <linux/sysdev.h>
#include "iova.h"
#include <linux/io.h>
/*
* We need a fixed PAGE_SIZE of 4K irrespective of
* arch PAGE_SIZE for IOMMU page tables.
*/
#define PAGE_SHIFT_4K (12)
#define PAGE_SIZE_4K (1UL << PAGE_SHIFT_4K)
#define PAGE_MASK_4K (((u64)-1) << PAGE_SHIFT_4K)
#define PAGE_ALIGN_4K(addr) (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT_4K)
#define DMA_32BIT_PFN IOVA_PFN(DMA_32BIT_MASK)
#define DMA_64BIT_PFN IOVA_PFN(DMA_64BIT_MASK)
/*
* Intel IOMMU register specification per version 1.0 public spec.
*/

8
drivers/pci/iova.c
View file

@ -9,19 +9,19 @@
#include "iova.h"
void
init_iova_domain(struct iova_domain *iovad)
init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit)
{
spin_lock_init(&iovad->iova_alloc_lock);
spin_lock_init(&iovad->iova_rbtree_lock);
iovad->rbroot = RB_ROOT;
iovad->cached32_node = NULL;
iovad->dma_32bit_pfn = pfn_32bit;
}
static struct rb_node *
__get_cached_rbnode(struct iova_domain *iovad, unsigned long *limit_pfn)
{
if ((*limit_pfn != DMA_32BIT_PFN) ||
if ((*limit_pfn != iovad->dma_32bit_pfn) ||
(iovad->cached32_node == NULL))
return rb_last(&iovad->rbroot);
else {
@ -37,7 +37,7 @@ static void
__cached_rbnode_insert_update(struct iova_domain *iovad,
unsigned long limit_pfn, struct iova *new)
{
if (limit_pfn != DMA_32BIT_PFN)
if (limit_pfn != iovad->dma_32bit_pfn)
return;
iovad->cached32_node = &new->node;
}

16
drivers/pci/iova.h
View file

@ -15,22 +15,9 @@
#include <linux/rbtree.h>
#include <linux/dma-mapping.h>
/*
* We need a fixed PAGE_SIZE of 4K irrespective of
* arch PAGE_SIZE for IOMMU page tables.
*/
#define PAGE_SHIFT_4K (12)
#define PAGE_SIZE_4K (1UL << PAGE_SHIFT_4K)
#define PAGE_MASK_4K (((u64)-1) << PAGE_SHIFT_4K)
#define PAGE_ALIGN_4K(addr) (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
/* IO virtual address start page frame number */
#define IOVA_START_PFN (1)
#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT_4K)
#define DMA_32BIT_PFN IOVA_PFN(DMA_32BIT_MASK)
#define DMA_64BIT_PFN IOVA_PFN(DMA_64BIT_MASK)
/* iova structure */
struct iova {
struct rb_node node;
@ -44,6 +31,7 @@ struct iova_domain {
spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
struct rb_root rbroot; /* iova domain rbtree root */
struct rb_node *cached32_node; /* Save last alloced node */
unsigned long dma_32bit_pfn;
};
struct iova *alloc_iova_mem(void);
@ -56,7 +44,7 @@ struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
unsigned long pfn_hi);
void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
void init_iova_domain(struct iova_domain *iovad);
void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
void put_iova_domain(struct iova_domain *iovad);