First round of arm64 fixes for -rc2

- Fix SPE probe failure when backing auxbuf with high-order pages
 
 - Fix handling of DMA allocations from outside of the vmalloc area
 
 - Fix generation of build-id ELF section for vDSO object
 
 - Disable huge I/O mappings if kernel page table dumping is enabled
 
 - A few other minor fixes (comments, kconfig etc)
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:

 - Fix SPE probe failure when backing auxbuf with high-order pages

 - Fix handling of DMA allocations from outside of the vmalloc area

 - Fix generation of build-id ELF section for vDSO object

 - Disable huge I/O mappings if kernel page table dumping is enabled

 - A few other minor fixes (comments, kconfig etc)

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: vdso: Explicitly add build-id option
  arm64/mm: Inhibit huge-vmap with ptdump
  arm64: Print physical address of page table base in show_pte()
  arm64: don't trash config with compat symbol if COMPAT is disabled
  arm64: assembler: Update comment above cond_yield_neon() macro
  drivers/perf: arm_spe: Don't error on high-order pages for aux buf
  arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable

arch/arm64/Kconfig

@@ -69,7 +69,7 @@ config ARM64
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 || CC_IS_CLANG
 	select ARCH_SUPPORTS_NUMA_BALANCING
-	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT
 	select ARCH_WANT_FRAME_POINTERS
 	select ARCH_HAS_UBSAN_SANITIZE_ALL
 	select ARM_AMBA

arch/arm64/include/asm/assembler.h

@@ -718,12 +718,11 @@ USER(\label, ic	ivau, \tmp2)			// invalidate I line PoU
  * the output section, any use of such directives is undefined.
  *
  * The yield itself consists of the following:
- * - Check whether the preempt count is exactly 1, in which case disabling
- *   preemption once will make the task preemptible. If this is not the case,
- *   yielding is pointless.
- * - Check whether TIF_NEED_RESCHED is set, and if so, disable and re-enable
- *   kernel mode NEON (which will trigger a reschedule), and branch to the
- *   yield fixup code.
+ * - Check whether the preempt count is exactly 1 and a reschedule is also
+ *   needed. If so, calling of preempt_enable() in kernel_neon_end() will
+ *   trigger a reschedule. If it is not the case, yielding is pointless.
+ * - Disable and re-enable kernel mode NEON, and branch to the yield fixup
+ *   code.
  *
  * This macro sequence may clobber all CPU state that is not guaranteed by the
  * AAPCS to be preserved across an ordinary function call.

arch/arm64/kernel/vdso/Makefile

@@ -12,8 +12,8 @@ obj-vdso := gettimeofday.o note.o sigreturn.o
 targets := $(obj-vdso) vdso.so vdso.so.dbg
 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
 
-ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 \
-		$(call ld-option, --hash-style=sysv) -n -T
+ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
+		--build-id -n -T
 
 # Disable gcov profiling for VDSO code
 GCOV_PROFILE := n

arch/arm64/mm/dma-mapping.c

@@ -249,6 +249,11 @@ static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
 	if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
 		return ret;
 
+	if (!is_vmalloc_addr(cpu_addr)) {
+		unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr));
+		return __swiotlb_mmap_pfn(vma, pfn, size);
+	}
+
 	if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
 		/*
 		 * DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped,
@@ -272,6 +277,11 @@ static int __iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 	struct vm_struct *area = find_vm_area(cpu_addr);
 
+	if (!is_vmalloc_addr(cpu_addr)) {
+		struct page *page = virt_to_page(cpu_addr);
+		return __swiotlb_get_sgtable_page(sgt, page, size);
+	}
+
 	if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
 		/*
 		 * DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped,

arch/arm64/mm/fault.c

@@ -171,9 +171,10 @@ static void show_pte(unsigned long addr)
 		return;
 	}
 
-	pr_alert("%s pgtable: %luk pages, %u-bit VAs, pgdp = %p\n",
+	pr_alert("%s pgtable: %luk pages, %u-bit VAs, pgdp=%016lx\n",
 		 mm == &init_mm ? "swapper" : "user", PAGE_SIZE / SZ_1K,
-		 mm == &init_mm ? VA_BITS : (int) vabits_user, mm->pgd);
+		 mm == &init_mm ? VA_BITS : (int)vabits_user,
+		 (unsigned long)virt_to_phys(mm->pgd));
 	pgdp = pgd_offset(mm, addr);
 	pgd = READ_ONCE(*pgdp);
 	pr_alert("[%016lx] pgd=%016llx", addr, pgd_val(pgd));

arch/arm64/mm/mmu.c

@@ -955,13 +955,18 @@ void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
 
 int __init arch_ioremap_pud_supported(void)
 {
-	/* only 4k granule supports level 1 block mappings */
-	return IS_ENABLED(CONFIG_ARM64_4K_PAGES);
+	/*
+	 * Only 4k granule supports level 1 block mappings.
+	 * SW table walks can't handle removal of intermediate entries.
+	 */
+	return IS_ENABLED(CONFIG_ARM64_4K_PAGES) &&
+	       !IS_ENABLED(CONFIG_ARM64_PTDUMP_DEBUGFS);
 }
 
 int __init arch_ioremap_pmd_supported(void)
 {
-	return 1;
+	/* See arch_ioremap_pud_supported() */
+	return !IS_ENABLED(CONFIG_ARM64_PTDUMP_DEBUGFS);
 }
 
 int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot)

drivers/perf/arm_spe_pmu.c

@@ -855,16 +855,8 @@ static void *arm_spe_pmu_setup_aux(struct perf_event *event, void **pages,
 	if (!pglist)
 		goto out_free_buf;
 
-	for (i = 0; i < nr_pages; ++i) {
-		struct page *page = virt_to_page(pages[i]);
-
-		if (PagePrivate(page)) {
-			pr_warn("unexpected high-order page for auxbuf!");
-			goto out_free_pglist;
-		}
-
+	for (i = 0; i < nr_pages; ++i)
 		pglist[i] = virt_to_page(pages[i]);
-	}
 
 	buf->base = vmap(pglist, nr_pages, VM_MAP, PAGE_KERNEL);
 	if (!buf->base)