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iommu/ipmmu-vmsa: PMD is never folded, PUD always is

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The driver only supports the 3-level long descriptor format that has no
PUD and always has a PMD.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Laurent Pinchart 2014-05-15 12:40:47 +02:00 committed by Joerg Roedel
parent 4ee3cc9c4a
commit 14e5123ee9
1 changed files with 9 additions and 57 deletions
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66
drivers/iommu/ipmmu-vmsa.c
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@ -215,7 +215,6 @@ static LIST_HEAD(ipmmu_devices);
#define IPMMU_PTRS_PER_PTE 512
#define IPMMU_PTRS_PER_PMD 512
#define IPMMU_PTRS_PER_PGD 4
#define IPMMU_PTRS_PER_PUD 1
/* -----------------------------------------------------------------------------
* Read/Write Access
@ -465,6 +464,8 @@ static irqreturn_t ipmmu_irq(int irq, void *dev)
* Page Table Management
*/
#define pud_pgtable(pud) pfn_to_page(__phys_to_pfn(pud_val(pud) & PHYS_MASK))
static void ipmmu_free_ptes(pmd_t *pmd)
{
pgtable_t table = pmd_pgtable(*pmd);
@ -473,10 +474,10 @@ static void ipmmu_free_ptes(pmd_t *pmd)
static void ipmmu_free_pmds(pud_t *pud)
{
pmd_t *pmd, *pmd_base = pmd_offset(pud, 0);
pmd_t *pmd = pmd_offset(pud, 0);
pgtable_t table;
unsigned int i;
pmd = pmd_base;
for (i = 0; i < IPMMU_PTRS_PER_PMD; ++i) {
if (pmd_none(*pmd))
continue;
@ -485,24 +486,8 @@ static void ipmmu_free_pmds(pud_t *pud)
pmd++;
}
pmd_free(NULL, pmd_base);
}
static void ipmmu_free_puds(pgd_t *pgd)
{
pud_t *pud, *pud_base = pud_offset(pgd, 0);
unsigned int i;
pud = pud_base;
for (i = 0; i < IPMMU_PTRS_PER_PUD; ++i) {
if (pud_none(*pud))
continue;
ipmmu_free_pmds(pud);
pud++;
}
pud_free(NULL, pud_base);
table = pud_pgtable(*pud);
__free_page(table);
}
static void ipmmu_free_pgtables(struct ipmmu_vmsa_domain *domain)
@ -520,7 +505,7 @@ static void ipmmu_free_pgtables(struct ipmmu_vmsa_domain *domain)
for (i = 0; i < IPMMU_PTRS_PER_PGD; ++i) {
if (pgd_none(*pgd))
continue;
ipmmu_free_puds(pgd);
ipmmu_free_pmds((pud_t *)pgd);
pgd++;
}
@ -624,7 +609,6 @@ static int ipmmu_alloc_init_pmd(struct ipmmu_vmsa_device *mmu, pud_t *pud,
pmd_t *pmd;
int ret;
#ifndef __PAGETABLE_PMD_FOLDED
if (pud_none(*pud)) {
pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC);
if (!pmd)
@ -636,7 +620,6 @@ static int ipmmu_alloc_init_pmd(struct ipmmu_vmsa_device *mmu, pud_t *pud,
pmd += pmd_index(addr);
} else
#endif
pmd = pmd_offset(pud, addr);
do {
@ -648,38 +631,6 @@ static int ipmmu_alloc_init_pmd(struct ipmmu_vmsa_device *mmu, pud_t *pud,
return ret;
}
static int ipmmu_alloc_init_pud(struct ipmmu_vmsa_device *mmu, pgd_t *pgd,
unsigned long addr, unsigned long end,
phys_addr_t phys, int prot)
{
unsigned long next;
pud_t *pud;
int ret;
#ifndef __PAGETABLE_PUD_FOLDED
if (pgd_none(*pgd)) {
pud = (pud_t *)get_zeroed_page(GFP_ATOMIC);
if (!pud)
return -ENOMEM;
ipmmu_flush_pgtable(mmu, pud, PAGE_SIZE);
*pgd = __pgd(__pa(pud) | PMD_NSTABLE | PMD_TYPE_TABLE);
ipmmu_flush_pgtable(mmu, pgd, sizeof(*pgd));
pud += pud_index(addr);
} else
#endif
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
ret = ipmmu_alloc_init_pmd(mmu, pud, addr, next, phys, prot);
phys += next - addr;
} while (pud++, addr = next, addr < end);
return ret;
}
static int ipmmu_handle_mapping(struct ipmmu_vmsa_domain *domain,
unsigned long iova, phys_addr_t paddr,
size_t size, int prot)
@ -707,7 +658,8 @@ static int ipmmu_handle_mapping(struct ipmmu_vmsa_domain *domain,
do {
unsigned long next = pgd_addr_end(iova, end);
ret = ipmmu_alloc_init_pud(mmu, pgd, iova, next, paddr, prot);
ret = ipmmu_alloc_init_pmd(mmu, (pud_t *)pgd, iova, next, paddr,
prot);
if (ret)
break;