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iommu: Make IOVA domain low limit flexible 

To share the IOVA allocator with other architectures, it needs to
accommodate more general aperture restrictions; move the lower limit
from a compile-time constant to a runtime domain property to allow
IOVA domains with different requirements to co-exist.

Also reword the slightly unclear description of alloc_iova since we're
touching it anyway.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2015-01-12 17:51:15 +00:00 committed by Joerg Roedel
parent 85b4545629
commit 1b72250076
3 changed files with 15 additions and 11 deletions
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9
drivers/iommu/intel-iommu.c
View File

@ -71,6 +71,9 @@
__DOMAIN_MAX_PFN(gaw), (unsigned long)-1))
#define DOMAIN_MAX_ADDR(gaw) (((uint64_t)__DOMAIN_MAX_PFN(gaw)) << VTD_PAGE_SHIFT)
/* IO virtual address start page frame number */
#define IOVA_START_PFN (1)
#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
#define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32))
#define DMA_64BIT_PFN IOVA_PFN(DMA_BIT_MASK(64))
@ -1632,7 +1635,7 @@ static int dmar_init_reserved_ranges(void)
struct iova *iova;
int i;
init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
init_iova_domain(&reserved_iova_list, IOVA_START_PFN, DMA_32BIT_PFN);
lockdep_set_class(&reserved_iova_list.iova_rbtree_lock,
&reserved_rbtree_key);
@ -1690,7 +1693,7 @@ static int domain_init(struct dmar_domain *domain, int guest_width)
int adjust_width, agaw;
unsigned long sagaw;
init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
init_iova_domain(&domain->iovad, IOVA_START_PFN, DMA_32BIT_PFN);
domain_reserve_special_ranges(domain);
/* calculate AGAW */
@ -4313,7 +4316,7 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
{
int adjust_width;
init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
init_iova_domain(&domain->iovad, IOVA_START_PFN, DMA_32BIT_PFN);
domain_reserve_special_ranges(domain);
/* calculate AGAW */

10
drivers/iommu/iova.c
View File

@ -55,11 +55,13 @@ void free_iova_mem(struct iova *iova)
}
void
init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit)
init_iova_domain(struct iova_domain *iovad, unsigned long start_pfn,
unsigned long pfn_32bit)
{
spin_lock_init(&iovad->iova_rbtree_lock);
iovad->rbroot = RB_ROOT;
iovad->cached32_node = NULL;
iovad->start_pfn = start_pfn;
iovad->dma_32bit_pfn = pfn_32bit;
}
@ -162,7 +164,7 @@ move_left:
if (!curr) {
if (size_aligned)
pad_size = iova_get_pad_size(size, limit_pfn);
if ((IOVA_START_PFN + size + pad_size) > limit_pfn) {
if ((iovad->start_pfn + size + pad_size) > limit_pfn) {
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
return -ENOMEM;
}
@ -237,8 +239,8 @@ iova_insert_rbtree(struct rb_root *root, struct iova *iova)
* @size: - size of page frames to allocate
* @limit_pfn: - max limit address
* @size_aligned: - set if size_aligned address range is required
* This function allocates an iova in the range limit_pfn to IOVA_START_PFN
* looking from limit_pfn instead from IOVA_START_PFN. If the size_aligned
* This function allocates an iova in the range iovad->start_pfn to limit_pfn,
* searching top-down from limit_pfn to iovad->start_pfn. If the size_aligned
* flag is set then the allocated address iova->pfn_lo will be naturally
* aligned on roundup_power_of_two(size).
*/

7
include/linux/iova.h
View File

@ -16,9 +16,6 @@
#include <linux/rbtree.h>
#include <linux/dma-mapping.h>
/* IO virtual address start page frame number */
#define IOVA_START_PFN (1)
/* iova structure */
struct iova {
struct rb_node node;
@ -31,6 +28,7 @@ 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 start_pfn; /* Lower limit for this domain */
unsigned long dma_32bit_pfn;
};
@ -52,7 +50,8 @@ 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, unsigned long pfn_32bit);
void init_iova_domain(struct iova_domain *iovad, unsigned long start_pfn,
unsigned long pfn_32bit);
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
void put_iova_domain(struct iova_domain *iovad);
struct iova *split_and_remove_iova(struct iova_domain *iovad,