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x86/amd-iommu: Change iommu_map_page to support multiple page sizes 

This patch adds a map_size parameter to the iommu_map_page
function which makes it generic enough to handle multiple
page sizes. This also requires a change to alloc_pte which
is also done in this patch.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-09-03 11:33:51 +02:00
parent a6b256b413
commit abdc5eb3d6
2 changed files with 26 additions and 11 deletions
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6
arch/x86/include/asm/amd_iommu_types.h
View File

@ -160,6 +160,12 @@
IOMMU_PTE_P | IOMMU_PTE_IR | IOMMU_PTE_IW)
#define PM_PTE_LEVEL(pte) (((pte) >> 9) & 0x7ULL)
#define PM_MAP_4k 0
#define PM_ADDR_MASK 0x000ffffffffff000ULL
#define PM_MAP_MASK(lvl) (PM_ADDR_MASK & \
(~((1ULL << (12 + ((lvl) * 9))) - 1)))
#define PM_ALIGNED(lvl, addr) ((PM_MAP_MASK(lvl) & (addr)) == (addr))
#define IOMMU_PTE_P (1ULL << 0)
#define IOMMU_PTE_TV (1ULL << 1)
#define IOMMU_PTE_U (1ULL << 59)

31
arch/x86/kernel/amd_iommu.c
View File

@ -56,8 +56,8 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
struct unity_map_entry *e);
static struct dma_ops_domain *find_protection_domain(u16 devid);
static u64 *alloc_pte(struct protection_domain *domain,
unsigned long address, u64
**pte_page, gfp_t gfp);
unsigned long address, int end_lvl,
u64 **pte_page, gfp_t gfp);
static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
unsigned long start_page,
unsigned int pages);
@ -523,17 +523,21 @@ void amd_iommu_flush_all_devices(void)
static int iommu_map_page(struct protection_domain *dom,
unsigned long bus_addr,
unsigned long phys_addr,
int prot)
int prot,
int map_size)
{
u64 __pte, *pte;
bus_addr = PAGE_ALIGN(bus_addr);
phys_addr = PAGE_ALIGN(phys_addr);
BUG_ON(!PM_ALIGNED(map_size, bus_addr));
BUG_ON(!PM_ALIGNED(map_size, phys_addr));
if (!(prot & IOMMU_PROT_MASK))
return -EINVAL;
pte = alloc_pte(dom, bus_addr, NULL, GFP_KERNEL);
pte = alloc_pte(dom, bus_addr, map_size, NULL, GFP_KERNEL);
if (IOMMU_PTE_PRESENT(*pte))
return -EBUSY;
@ -612,7 +616,8 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
for (addr = e->address_start; addr < e->address_end;
addr += PAGE_SIZE) {
ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot);
ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot,
PM_MAP_4k);
if (ret)
return ret;
/*
@ -729,7 +734,7 @@ static int alloc_new_range(struct amd_iommu *iommu,
u64 *pte, *pte_page;
for (i = 0; i < num_ptes; ++i) {
pte = alloc_pte(&dma_dom->domain, address,
pte = alloc_pte(&dma_dom->domain, address, PM_MAP_4k,
&pte_page, gfp);
if (!pte)
goto out_free;
@ -1356,7 +1361,10 @@ static bool increase_address_space(struct protection_domain *domain,
}
static u64 *alloc_pte(struct protection_domain *domain,
unsigned long address, u64 **pte_page, gfp_t gfp)
unsigned long address,
int end_lvl,
u64 **pte_page,
gfp_t gfp)
{
u64 *pte, *page;
int level;
@ -1367,7 +1375,7 @@ static u64 *alloc_pte(struct protection_domain *domain,
level = domain->mode - 1;
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
while (level > 0) {
while (level > end_lvl) {
if (!IOMMU_PTE_PRESENT(*pte)) {
page = (u64 *)get_zeroed_page(gfp);
if (!page)
@ -1379,7 +1387,7 @@ static u64 *alloc_pte(struct protection_domain *domain,
pte = IOMMU_PTE_PAGE(*pte);
if (pte_page && level == 0)
if (pte_page && level == end_lvl)
*pte_page = pte;
pte = &pte[PM_LEVEL_INDEX(level, address)];
@ -1403,7 +1411,8 @@ static u64* dma_ops_get_pte(struct dma_ops_domain *dom,
pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
if (!pte) {
pte = alloc_pte(&dom->domain, address, &pte_page, GFP_ATOMIC);
pte = alloc_pte(&dom->domain, address, PM_MAP_4k, &pte_page,
GFP_ATOMIC);
aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page;
} else
pte += PM_LEVEL_INDEX(0, address);
@ -2176,7 +2185,7 @@ static int amd_iommu_map_range(struct iommu_domain *dom,
paddr &= PAGE_MASK;
for (i = 0; i < npages; ++i) {
ret = iommu_map_page(domain, iova, paddr, prot);
ret = iommu_map_page(domain, iova, paddr, prot, PM_MAP_4k);
if (ret)
return ret;