From 56f3c1413f5cce0c8f4d6f1ab79d790da5aa61af Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Tue, 9 Oct 2018 13:51:43 +0000 Subject: [PATCH] powerpc/mm: properly set PAGE_KERNEL flags in ioremap() 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 Signed-off-by: Michael Ellerman --- 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; -- 2.11.0