Change ioremap_pud_range() and ioremap_pmd_range() to set up
huge I/O mappings when their capability is enabled and their
conditions are met in a given request -- both virtual & physical
addresses are aligned and its range fufills the mapping size.
These changes are only enabled when both CONFIG_HUGE_IOMAP
and CONFIG_HAVE_ARCH_HUGE_VMAP are defined.
Signed-off-by: Toshi Kani <toshi.kani@xxxxxx>
---
arch/Kconfig | 3 +++
include/asm-generic/pgtable.h | 8 ++++++++
lib/ioremap.c | 16 ++++++++++++++++
3 files changed, 27 insertions(+)
diff --git a/arch/Kconfig b/arch/Kconfig
index 05d7a8a..55c4440 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -446,6 +446,9 @@ config HAVE_IRQ_TIME_ACCOUNTING
config HAVE_ARCH_TRANSPARENT_HUGEPAGE
bool
+config HAVE_ARCH_HUGE_VMAP
+ bool
+
config HAVE_ARCH_SOFT_DIRTY
bool
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 177d597..7dc3838 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -847,4 +847,12 @@ static inline void pmdp_set_numa(struct mm_struct *mm, unsigned long addr,
#define io_remap_pfn_range remap_pfn_range
#endif
+#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
+void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot);
+#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
+static inline void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) { }
+static inline void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) { }
+#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
+
#endif /* _ASM_GENERIC_PGTABLE_H */
diff --git a/lib/ioremap.c b/lib/ioremap.c
index 0a1ecb6..01b70aa 100644
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -81,6 +81,14 @@ static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
return -ENOMEM;
do {
next = pmd_addr_end(addr, end);
+
+ if (ioremap_pmd_enabled() &&
+ ((next - addr) == PMD_SIZE) &&
+ !((phys_addr + addr) & (PMD_SIZE-1))) {
+ pmd_set_huge(pmd, phys_addr + addr, prot);
+ continue;
+ }
+
if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
return -ENOMEM;
} while (pmd++, addr = next, addr != end);
@@ -99,6 +107,14 @@ static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
return -ENOMEM;
do {
next = pud_addr_end(addr, end);
+
+ if (ioremap_pud_enabled() &&
+ ((next - addr) == PUD_SIZE) &&
+ !((phys_addr + addr) & (PUD_SIZE-1))) {
+ pud_set_huge(pud, phys_addr + addr, prot);
+ continue;
+ }
+
if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
return -ENOMEM;
} while (pud++, addr = next, addr != end);
--
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