[PATCH v3 06/24] powerpc/mm: properly set PAGE_KERNEL flags in ioremap()

Christophe Leroy
2018-10-09T13:51:48Z

Set PAGE_KERNEL directly in the caller and do not rely on a
hack adding PAGE_KERNEL flags when _PAGE_PRESENT is not set.

As already done for PPC64, use pgprot_cache() helpers instead of
_PAGE_XXX flags in PPC32 ioremap() derived functions.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/nohash/pgtable.h | 2 ++
arch/powerpc/kernel/isa-bridge.c | 6 +++---
arch/powerpc/kernel/pci_64.c | 2 +-
arch/powerpc/mm/pgtable_32.c | 28 ++++++++++++----------------
arch/powerpc/mm/pgtable_64.c | 10 +++-------
arch/powerpc/platforms/4xx/ocm.c | 7 ++-----
drivers/pcmcia/electra_cf.c | 2 +-
7 files changed, 24 insertions(+), 33 deletions(-)

diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index b321c82b3624..5b82e44c4231 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -197,6 +197,8 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long addre
#if _PAGE_WRITETHRU != 0
#define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
_PAGE_COHERENT | _PAGE_WRITETHRU))
+#else
+#define pgprot_cached_wthru(prot) pgprot_noncached(prot)
#endif

#define pgprot_cached_noncoherent(prot) \
diff --git a/arch/powerpc/kernel/isa-bridge.c b/arch/powerpc/kernel/isa-bridge.c
index 1df6c74aa731..072e384f8c86 100644
--- a/arch/powerpc/kernel/isa-bridge.c
+++ b/arch/powerpc/kernel/isa-bridge.c
@@ -110,14 +110,14 @@ static void pci_process_ISA_OF_ranges(struct device_node *isa_node,
size = 0x10000;

__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
- size, pgprot_val(pgprot_noncached(__pgprot(0))));
+ size, pgprot_val(pgprot_noncached(PAGE_KERNEL)));
return;

inval_range:
printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
"mapping 64k\n");
__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
- 0x10000, pgprot_val(pgprot_noncached(__pgprot(0))));
+ 0x10000, pgprot_val(pgprot_noncached(PAGE_KERNEL)));
}

@@ -253,7 +253,7 @@ void __init isa_bridge_init_non_pci(struct device_node *np)
*/
isa_io_base = ISA_IO_BASE;
__ioremap_at(pbase, (void *)ISA_IO_BASE,
- size, pgprot_val(pgprot_noncached(__pgprot(0))));
+ size, pgprot_val(pgprot_noncached(PAGE_KERNEL)));

pr_debug("ISA: Non-PCI bridge is %pOF\n", np);
}
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index dff28f903512..64bb4dd2b8f1 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -159,7 +159,7 @@ static int pcibios_map_phb_io_space(struct pci_controller *hose)

/* Establish the mapping */
if (__ioremap_at(phys_page, area->addr, size_page,
- pgprot_val(pgprot_noncached(__pgprot(0)))) == NULL)
+ pgprot_val(pgprot_noncached(PAGE_KERNEL))) == NULL)
return -ENOMEM;

/* Fixup hose IO resource */
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 4c3adde09d95..6a81a2446c47 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -76,32 +76,36 @@ pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
void __iomem *
ioremap(phys_addr_t addr, unsigned long size)
{
- return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
- __builtin_return_address(0));
+ unsigned long flags = pgprot_val(pgprot_noncached(PAGE_KERNEL));
+
+ return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap);

void __iomem *
ioremap_wc(phys_addr_t addr, unsigned long size)
{
- return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
- __builtin_return_address(0));
+ unsigned long flags = pgprot_val(pgprot_noncached_wc(PAGE_KERNEL));
+
+ return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_wc);

void __iomem *
ioremap_wt(phys_addr_t addr, unsigned long size)
{
- return __ioremap_caller(addr, size, _PAGE_WRITETHRU,
- __builtin_return_address(0));
+ unsigned long flags = pgprot_val(pgprot_cached_wthru(PAGE_KERNEL));
+
+ return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_wt);

void __iomem *
ioremap_coherent(phys_addr_t addr, unsigned long size)
{
- return __ioremap_caller(addr, size, _PAGE_COHERENT,
- __builtin_return_address(0));
+ unsigned long flags = pgprot_val(pgprot_cached(PAGE_KERNEL));
+
+ return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_coherent);

@@ -134,14 +138,6 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
phys_addr_t p;
int err;

- /* Make sure we have the base flags */
- if ((flags & _PAGE_PRESENT) == 0)
- flags |= pgprot_val(PAGE_KERNEL);
-
- /* Non-cacheable page cannot be coherent */
- if (flags & _PAGE_NO_CACHE)
- flags &= ~_PAGE_COHERENT;
-
/*
* Choose an address to map it to.
* Once the vmalloc system is running, we use it.
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index c0f356d9b135..1f1bb40555a8 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -118,10 +118,6 @@ void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
{
unsigned long i;

- /* Make sure we have the base flags */
- if ((flags & _PAGE_PRESENT) == 0)
- flags |= pgprot_val(PAGE_KERNEL);
-
/* We don't support the 4K PFN hack with ioremap */
if (flags & H_PAGE_4K_PFN)
return NULL;
@@ -204,7 +200,7 @@ void __iomem * __ioremap(phys_addr_t addr, unsigned long size,

void __iomem * ioremap(phys_addr_t addr, unsigned long size)
{
- unsigned long flags = pgprot_val(pgprot_noncached(__pgprot(0)));
+ unsigned long flags = pgprot_val(pgprot_noncached(PAGE_KERNEL));
void *caller = __builtin_return_address(0);

if (ppc_md.ioremap)
@@ -214,7 +210,7 @@ void __iomem * ioremap(phys_addr_t addr, unsigned long size)

void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
{
- unsigned long flags = pgprot_val(pgprot_noncached_wc(__pgprot(0)));
+ unsigned long flags = pgprot_val(pgprot_noncached_wc(PAGE_KERNEL));
void *caller = __builtin_return_address(0);

if (ppc_md.ioremap)
@@ -224,7 +220,7 @@ void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)

void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
{
- unsigned long flags = pgprot_val(pgprot_cached(__pgprot(0)));
+ unsigned long flags = pgprot_val(pgprot_cached(PAGE_KERNEL));
void *caller = __builtin_return_address(0);

if (ppc_md.ioremap)
diff --git a/arch/powerpc/platforms/4xx/ocm.c b/arch/powerpc/platforms/4xx/ocm.c
index 69d9f60d9fe5..f5bbd4563342 100644
--- a/arch/powerpc/platforms/4xx/ocm.c
+++ b/arch/powerpc/platforms/4xx/ocm.c
@@ -113,7 +113,6 @@ static void __init ocm_init_node(int count, struct device_node *node)
int len;

struct resource rsrc;
- int ioflags;

ocm = ocm_get_node(count);

@@ -179,9 +178,8 @@ static void __init ocm_init_node(int count, struct device_node *node)

/* ioremap the non-cached region */
if (ocm->nc.memtotal) {
- ioflags = _PAGE_NO_CACHE | _PAGE_GUARDED | _PAGE_EXEC;
ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
- ioflags);
+ _PAGE_EXEC | PAGE_KERNEL_NCG);

if (!ocm->nc.virt) {
printk(KERN_ERR
@@ -195,9 +193,8 @@ static void __init ocm_init_node(int count, struct device_node *node)
/* ioremap the cached region */

if (ocm->c.memtotal) {
- ioflags = _PAGE_EXEC;
ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
- ioflags);
+ _PAGE_EXEC | PAGE_KERNEL);

if (!ocm->c.virt) {
printk(KERN_ERR
diff --git a/drivers/pcmcia/electra_cf.c b/drivers/pcmcia/electra_cf.c
index 9671ded549f0..34d6c1a0971e 100644
--- a/drivers/pcmcia/electra_cf.c
+++ b/drivers/pcmcia/electra_cf.c
@@ -230,7 +230,7 @@ static int electra_cf_probe(struct platform_device *ofdev)

if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
(__ioremap_at(io.start, cf->io_virt, cf->io_size,
- pgprot_val(pgprot_noncached(__pgprot(0)))) == NULL)) {
+ pgprot_val(pgprot_noncached(PAGE_KERNEL))) == NULL)) {
dev_err(device, "can't ioremap ranges\n");
status = -ENOMEM;
goto fail1;
--
2.13.3