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dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=X3jbTE06; spf=pass (imf30.hostedemail.com: domain of bhe@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=bhe@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: z5niwbca6q1q4xpftkyt6kd4xgi5uiz1 X-Rspamd-Server: rspam10 X-HE-Tag: 1660955515-185431 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add hooks arch_ioremap() and arch_iounmap() for arc's special operation when ioremap_prot() and iounmap(). Meanwhile define and implement arc's own ioremap() because arc has some special handling in ioremap() than standard ioremap(). Signed-off-by: Baoquan He Cc: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org --- arch/arc/Kconfig | 1 + arch/arc/include/asm/io.h | 19 +++++++++---- arch/arc/mm/ioremap.c | 60 ++++++--------------------------------- 3 files changed, 23 insertions(+), 57 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 9e3653253ef2..a08d2abfaf61 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -26,6 +26,7 @@ config ARC select GENERIC_PENDING_IRQ if SMP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD + select GENERIC_IOREMAP select HAVE_ARCH_KGDB select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4 diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h index 8f777d6441a5..af88a2c5550e 100644 --- a/arch/arc/include/asm/io.h +++ b/arch/arc/include/asm/io.h @@ -20,9 +20,20 @@ #define __iowmb() do { } while (0) #endif -extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size); -extern void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size, - unsigned long flags); +/* + * I/O memory mapping functions. + */ + +void __iomem * +arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val); +#define arch_ioremap arch_ioremap + +int arch_iounmap(void __iomem *addr); +#define arch_iounmap arch_iounmap + +void __iomem *ioremap(phys_addr_t paddr, unsigned long size); +#define ioremap ioremap + static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) { return (void __iomem *)port; @@ -32,8 +43,6 @@ static inline void ioport_unmap(void __iomem *addr) { } -extern void iounmap(const void __iomem *addr); - /* * io{read,write}{16,32}be() macros */ diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c index 0ee75aca6e10..72b01da31ea1 100644 --- a/arch/arc/mm/ioremap.c +++ b/arch/arc/mm/ioremap.c @@ -25,13 +25,6 @@ static inline bool arc_uncached_addr_space(phys_addr_t paddr) void __iomem *ioremap(phys_addr_t paddr, unsigned long size) { - phys_addr_t end; - - /* Don't allow wraparound or zero size */ - end = paddr + size - 1; - if (!size || (end < paddr)) - return NULL; - /* * If the region is h/w uncached, MMU mapping can be elided as optim * The cast to u32 is fine as this region can only be inside 4GB @@ -44,62 +37,25 @@ void __iomem *ioremap(phys_addr_t paddr, unsigned long size) } EXPORT_SYMBOL(ioremap); -/* - * ioremap with access flags - * Cache semantics wise it is same as ioremap - "forced" uncached. - * However unlike vanilla ioremap which bypasses ARC MMU for addresses in - * ARC hardware uncached region, this one still goes thru the MMU as caller - * might need finer access control (R/W/X) - */ -void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size, - unsigned long flags) +void __iomem * +arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val) { - unsigned int off; - unsigned long vaddr; - struct vm_struct *area; - phys_addr_t end; - pgprot_t prot = __pgprot(flags); - - /* Don't allow wraparound, zero size */ - end = paddr + size - 1; - if ((!size) || (end < paddr)) - return NULL; - /* An early platform driver might end up here */ if (!slab_is_available()) - return NULL; + return IOMEM_ERR_PTR(-EINVAL); /* force uncached */ - prot = pgprot_noncached(prot); + *prot_val = pgprot_val(pgprot_noncached(__pgprot(*prot_val))); - /* Mappings have to be page-aligned */ - off = paddr & ~PAGE_MASK; - paddr &= PAGE_MASK_PHYS; - size = PAGE_ALIGN(end + 1) - paddr; + return NULL; - /* - * Ok, go for it.. - */ - area = get_vm_area(size, VM_IOREMAP); - if (!area) - return NULL; - area->phys_addr = paddr; - vaddr = (unsigned long)area->addr; - if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) { - vunmap((void __force *)vaddr); - return NULL; - } - return (void __iomem *)(off + (char __iomem *)vaddr); } -EXPORT_SYMBOL(ioremap_prot); - -void iounmap(const void __iomem *addr) +int arch_iounmap(void __iomem *addr) { /* weird double cast to handle phys_addr_t > 32 bits */ if (arc_uncached_addr_space((phys_addr_t)(u32)addr)) - return; + return -EINVAL; - vfree((void *)(PAGE_MASK & (unsigned long __force)addr)); + return 0; } -EXPORT_SYMBOL(iounmap);