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Commit 14e5123e authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Joerg Roedel
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iommu/ipmmu-vmsa: PMD is never folded, PUD always is 



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

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 4ee3cc9c

drivers/iommu/ipmmu-vmsa.c

+9 −57
Original line number Diff line number Diff line
@@ -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;