Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pyll ARM64 patches from Catalin Marinas:
 - Build fix with DMA_CMA enabled
 - Introduction of PTE_WRITE to distinguish between writable but clean
   and truly read-only pages
 - FIQs enabling/disabling clean-up (they aren't used on arm64)
 - CPU resume fix for the per-cpu offset restoring
 - Code comment typos

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: mm: Introduce PTE_WRITE
  arm64: mm: Remove PTE_BIT_FUNC macro
  arm64: FIQs are unused
  arm64: mm: fix the function name in comment of cpu_do_switch_mm
  arm64: fix build error if DMA_CMA is enabled
  arm64: kernel: fix per-cpu offset restore on resume
  arm64: mm: fix the function name in comment of __flush_dcache_area
  arm64: mm: use ubfm for dcache_line_size

arch/arm64/include/asm/dma-contiguous.h

@@ -18,7 +18,6 @@
 #ifdef CONFIG_DMA_CMA
 
 #include <linux/types.h>
-#include <asm-generic/dma-contiguous.h>
 
 static inline void
 dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) { }

arch/arm64/include/asm/pgtable.h

@@ -28,7 +28,7 @@
 #define PTE_FILE		(_AT(pteval_t, 1) << 2)	/* only when !pte_present() */
 #define PTE_DIRTY		(_AT(pteval_t, 1) << 55)
 #define PTE_SPECIAL		(_AT(pteval_t, 1) << 56)
-				/* bit 57 for PMD_SECT_SPLITTING */
+#define PTE_WRITE		(_AT(pteval_t, 1) << 57)
 #define PTE_PROT_NONE		(_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
 
 /*
@@ -67,15 +67,15 @@ extern pgprot_t pgprot_default;
 
 #define _MOD_PROT(p, b)		__pgprot_modify(p, 0, b)
 
-#define PAGE_NONE		__pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN)
-#define PAGE_SHARED		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
-#define PAGE_SHARED_EXEC	_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
-#define PAGE_COPY		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
-#define PAGE_COPY_EXEC		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
-#define PAGE_READONLY		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
-#define PAGE_READONLY_EXEC	_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
-#define PAGE_KERNEL		_MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY)
-#define PAGE_KERNEL_EXEC	_MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY)
+#define PAGE_NONE		__pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_PXN | PTE_UXN)
+#define PAGE_SHARED		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
+#define PAGE_SHARED_EXEC	_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
+#define PAGE_COPY		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
+#define PAGE_COPY_EXEC		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
+#define PAGE_READONLY		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
+#define PAGE_READONLY_EXEC	_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
+#define PAGE_KERNEL		_MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE)
+#define PAGE_KERNEL_EXEC	_MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY | PTE_WRITE)
 
 #define PAGE_HYP		_MOD_PROT(pgprot_default, PTE_HYP)
 #define PAGE_HYP_DEVICE		__pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
@@ -83,13 +83,13 @@ extern pgprot_t pgprot_default;
 #define PAGE_S2			__pgprot_modify(pgprot_default, PTE_S2_MEMATTR_MASK, PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY)
 #define PAGE_S2_DEVICE		__pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN)
 
-#define __PAGE_NONE		__pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN)
-#define __PAGE_SHARED		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
-#define __PAGE_SHARED_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
-#define __PAGE_COPY		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
-#define __PAGE_COPY_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
-#define __PAGE_READONLY		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
-#define __PAGE_READONLY_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
+#define __PAGE_NONE		__pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_PXN | PTE_UXN)
+#define __PAGE_SHARED		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
+#define __PAGE_SHARED_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
+#define __PAGE_COPY		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
+#define __PAGE_COPY_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
+#define __PAGE_READONLY		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
+#define __PAGE_READONLY_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
 
 #endif /* __ASSEMBLY__ */
 
@@ -140,22 +140,53 @@ extern struct page *empty_zero_page;
 #define pte_dirty(pte)		(pte_val(pte) & PTE_DIRTY)
 #define pte_young(pte)		(pte_val(pte) & PTE_AF)
 #define pte_special(pte)	(pte_val(pte) & PTE_SPECIAL)
-#define pte_write(pte)		(!(pte_val(pte) & PTE_RDONLY))
+#define pte_write(pte)		(pte_val(pte) & PTE_WRITE)
 #define pte_exec(pte)		(!(pte_val(pte) & PTE_UXN))
 
 #define pte_valid_user(pte) \
 	((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
 
-#define PTE_BIT_FUNC(fn,op) \
-static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	pte_val(pte) &= ~PTE_WRITE;
+	return pte;
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+	pte_val(pte) |= PTE_WRITE;
+	return pte;
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+	pte_val(pte) &= ~PTE_DIRTY;
+	return pte;
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+	pte_val(pte) |= PTE_DIRTY;
+	return pte;
+}
 
-PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY);
-PTE_BIT_FUNC(mkwrite,   &= ~PTE_RDONLY);
-PTE_BIT_FUNC(mkclean,   &= ~PTE_DIRTY);
-PTE_BIT_FUNC(mkdirty,   |= PTE_DIRTY);
-PTE_BIT_FUNC(mkold,     &= ~PTE_AF);
-PTE_BIT_FUNC(mkyoung,   |= PTE_AF);
-PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL);
+static inline pte_t pte_mkold(pte_t pte)
+{
+	pte_val(pte) &= ~PTE_AF;
+	return pte;
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+	pte_val(pte) |= PTE_AF;
+	return pte;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	pte_val(pte) |= PTE_SPECIAL;
+	return pte;
+}
 
 static inline void set_pte(pte_t *ptep, pte_t pte)
 {
@@ -170,8 +201,10 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 	if (pte_valid_user(pte)) {
 		if (pte_exec(pte))
 			__sync_icache_dcache(pte, addr);
-		if (!pte_dirty(pte))
-			pte = pte_wrprotect(pte);
+		if (pte_dirty(pte) && pte_write(pte))
+			pte_val(pte) &= ~PTE_RDONLY;
+		else
+			pte_val(pte) |= PTE_RDONLY;
 	}
 
 	set_pte(ptep, pte);
@@ -345,7 +378,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
-			      PTE_PROT_NONE | PTE_VALID;
+			      PTE_PROT_NONE | PTE_VALID | PTE_WRITE;
 	pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
 	return pte;
 }

arch/arm64/kernel/process.c

@@ -85,11 +85,6 @@ EXPORT_SYMBOL_GPL(pm_power_off);
 void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
 EXPORT_SYMBOL_GPL(arm_pm_restart);
 
-void arch_cpu_idle_prepare(void)
-{
-	local_fiq_enable();
-}
-
 /*
  * This is our default idle handler.
  */
@@ -138,7 +133,6 @@ void machine_restart(char *cmd)
 
 	/* Disable interrupts first */
 	local_irq_disable();
-	local_fiq_disable();
 
 	/* Now call the architecture specific reboot code. */
 	if (arm_pm_restart)

arch/arm64/kernel/smp.c

@@ -161,7 +161,6 @@ asmlinkage void secondary_start_kernel(void)
 	complete(&cpu_running);
 
 	local_irq_enable();
-	local_fiq_enable();
 	local_async_enable();
 
 	/*
@@ -495,7 +494,6 @@ static void ipi_cpu_stop(unsigned int cpu)
 
 	set_cpu_online(cpu, false);
 
-	local_fiq_disable();
 	local_irq_disable();
 
 	while (1)

arch/arm64/kernel/suspend.c

+#include <linux/percpu.h>
 #include <linux/slab.h>
 #include <asm/cacheflush.h>
 #include <asm/cpu_ops.h>
@@ -89,6 +90,13 @@ int cpu_suspend(unsigned long arg)
 	if (ret == 0) {
 		cpu_switch_mm(mm->pgd, mm);
 		flush_tlb_all();
+
+		/*
+		 * Restore per-cpu offset before any kernel
+		 * subsystem relying on it has a chance to run.
+		 */
+		set_my_cpu_offset(per_cpu_offset(cpu));
+
 		/*
 		 * Restore HW breakpoint registers to sane values
 		 * before debug exceptions are possibly reenabled

arch/arm64/mm/cache.S

@@ -146,7 +146,7 @@ ENDPROC(flush_icache_range)
 ENDPROC(__flush_cache_user_range)
 
 /*
- *	__flush_kern_dcache_page(kaddr)
+ *	__flush_dcache_area(kaddr, size)
  *
  *	Ensure that the data held in the page kaddr is written back to the
  *	page in question.

arch/arm64/mm/proc-macros.S

@@ -38,8 +38,7 @@
  */
 	.macro	dcache_line_size, reg, tmp
 	mrs	\tmp, ctr_el0			// read CTR
-	lsr	\tmp, \tmp, #16
-	and	\tmp, \tmp, #0xf		// cache line size encoding
+	ubfm	\tmp, \tmp, #16, #19		// cache line size encoding
 	mov	\reg, #4			// bytes per word
 	lsl	\reg, \reg, \tmp		// actual cache line size
 	.endm

arch/arm64/mm/proc.S

@@ -150,7 +150,7 @@ ENDPROC(cpu_do_resume)
 #endif
 
 /*
- *	cpu_switch_mm(pgd_phys, tsk)
+ *	cpu_do_switch_mm(pgd_phys, tsk)
  *
  *	Set the translation table base pointer to be pgd_phys.
  *