Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/mman.h b/arch/sparc/include/asm/mman.h
new file mode 100644
index 000000000..274217e7e
--- /dev/null
+++ b/arch/sparc/include/asm/mman.h
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __SPARC_MMAN_H__
+#define __SPARC_MMAN_H__
+
+#include <uapi/asm/mman.h>
+
+#ifndef __ASSEMBLY__
+#define arch_mmap_check(addr,len,flags)	sparc_mmap_check(addr,len)
+int sparc_mmap_check(unsigned long addr, unsigned long len);
+
+#ifdef CONFIG_SPARC64
+#include <asm/adi_64.h>
+
+static inline void ipi_set_tstate_mcde(void *arg)
+{
+	struct mm_struct *mm = arg;
+
+	/* Set TSTATE_MCDE for the task using address map that ADI has been
+	 * enabled on if the task is running. If not, it will be set
+	 * automatically at the next context switch
+	 */
+	if (current->mm == mm) {
+		struct pt_regs *regs;
+
+		regs = task_pt_regs(current);
+		regs->tstate |= TSTATE_MCDE;
+	}
+}
+
+#define arch_calc_vm_prot_bits(prot, pkey) sparc_calc_vm_prot_bits(prot)
+static inline unsigned long sparc_calc_vm_prot_bits(unsigned long prot)
+{
+	if (adi_capable() && (prot & PROT_ADI)) {
+		struct pt_regs *regs;
+
+		if (!current->mm->context.adi) {
+			regs = task_pt_regs(current);
+			regs->tstate |= TSTATE_MCDE;
+			current->mm->context.adi = true;
+			on_each_cpu_mask(mm_cpumask(current->mm),
+					 ipi_set_tstate_mcde, current->mm, 0);
+		}
+		return VM_SPARC_ADI;
+	} else {
+		return 0;
+	}
+}
+
+#define arch_vm_get_page_prot(vm_flags) sparc_vm_get_page_prot(vm_flags)
+static inline pgprot_t sparc_vm_get_page_prot(unsigned long vm_flags)
+{
+	return (vm_flags & VM_SPARC_ADI) ? __pgprot(_PAGE_MCD_4V) : __pgprot(0);
+}
+
+#define arch_validate_prot(prot, addr) sparc_validate_prot(prot, addr)
+static inline int sparc_validate_prot(unsigned long prot, unsigned long addr)
+{
+	if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_ADI))
+		return 0;
+	return 1;
+}
+
+#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
+/* arch_validate_flags() - Ensure combination of flags is valid for a
+ *	VMA.
+ */
+static inline bool arch_validate_flags(unsigned long vm_flags)
+{
+	/* If ADI is being enabled on this VMA, check for ADI
+	 * capability on the platform and ensure VMA is suitable
+	 * for ADI
+	 */
+	if (vm_flags & VM_SPARC_ADI) {
+		if (!adi_capable())
+			return false;
+
+		/* ADI can not be enabled on PFN mapped pages */
+		if (vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
+			return false;
+
+		/* Mergeable pages can become unmergeable
+		 * if ADI is enabled on them even if they
+		 * have identical data on them. This can be
+		 * because ADI enabled pages with identical
+		 * data may still not have identical ADI
+		 * tags on them. Disallow ADI on mergeable
+		 * pages.
+		 */
+		if (vm_flags & VM_MERGEABLE)
+			return false;
+	}
+	return true;
+}
+#endif /* CONFIG_SPARC64 */
+
+#endif /* __ASSEMBLY__ */
+#endif /* __SPARC_MMAN_H__ */