Merge tag 'powerpc-4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "Highlights include:

   - Support for direct mapped LPC on POWER9, giving Linux direct access
     to devices that may be on there such as a UART.

   - Memory hotplug support for the Power9 Radix MMU.

   - Add new AUX vectors describing the processor's cache geometry, to
     be used by glibc.

   - The ability for a guest to ask the hypervisor to resize the guest's
     hash table, and in addition support for doing so automatically when
     memory is hotplugged into/out-of the guest. This allows the hash
     table to be sized based on the current memory usage of the guest,
     rather than the maximum possible memory usage.

   - Implementation of optprobes (kprobe optimisation) for powerpc.

  In addition there's the topic branch shared with the KVM tree, which
  includes support for guests to use the Radix MMU on Power9.

  Thanks to:
    Alistair Popple, Andrew Donnellan, Aneesh Kumar K.V, Anju T, Anton
    Blanchard, Benjamin Herrenschmidt, Chris Packham, Daniel Axtens,
    Daniel Borkmann, David Gibson, Finn Thain, Gautham R. Shenoy, Gavin
    Shan, Greg Kurz, Joel Stanley, John Allen, Madhavan Srinivasan,
    Mahesh Salgaonkar, Markus Elfring, Michael Neuling, Nathan Fontenot,
    Naveen N. Rao, Nicholas Piggin, Paul Mackerras, Ravi Bangoria, Reza
    Arbab, Shailendra Singh, Vaibhav Jain, Wei Yongjun"

* tag 'powerpc-4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (129 commits)
  powerpc/mm/radix: Skip ptesync in pte update helpers
  powerpc/mm/radix: Use ptep_get_and_clear_full when clearing pte for full mm
  powerpc/mm/radix: Update pte update sequence for pte clear case
  powerpc/mm: Update PROTFAULT handling in the page fault path
  powerpc/xmon: Fix data-breakpoint
  powerpc/mm: Fix build break with BOOK3S_64=n and MEMORY_HOTPLUG=y
  powerpc/mm: Fix build break when CMA=n && SPAPR_TCE_IOMMU=y
  powerpc/mm: Fix build break with RADIX=y & HUGETLBFS=n
  powerpc/pseries: Fix typo in parameter description
  powerpc/kprobes: Remove kprobe_exceptions_notify()
  kprobes: Introduce weak variant of kprobe_exceptions_notify()
  powerpc/ftrace: Fix confusing help text for DISABLE_MPROFILE_KERNEL
  powerpc/powernv: Fix opal_exit tracepoint opcode
  powerpc: Add a prototype for mcount() so it can be versioned
  powerpc: Drop GPL from of_node_to_nid() export to match other arches
  powerpc/kprobes: Optimize kprobe in kretprobe_trampoline()
  powerpc/kprobes: Implement Optprobes
  powerpc/kprobes: Fixes for kprobe_lookup_name() on BE
  powerpc: Add helper to check if offset is within relative branch range
  powerpc/bpf: Introduce __PPC_SH64()
  ...

1 files changed, 222 insertions, 39 deletions

diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 34f1a0d..feeda90 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -18,6 +18,7 @@
 #include <asm/machdep.h>
 #include <asm/mmu.h>
 #include <asm/firmware.h>
+#include <asm/powernv.h>
 
 #include <trace/events/thp.h>
 
@@ -107,54 +108,66 @@ set_the_pte:
 	return 0;
 }
 
+static inline void __meminit print_mapping(unsigned long start,
+					   unsigned long end,
+					   unsigned long size)
+{
+	if (end <= start)
+		return;
+
+	pr_info("Mapped range 0x%lx - 0x%lx with 0x%lx\n", start, end, size);
+}
+
+static int __meminit create_physical_mapping(unsigned long start,
+					     unsigned long end)
+{
+	unsigned long addr, mapping_size = 0;
+
+	start = _ALIGN_UP(start, PAGE_SIZE);
+	for (addr = start; addr < end; addr += mapping_size) {
+		unsigned long gap, previous_size;
+		int rc;
+
+		gap = end - addr;
+		previous_size = mapping_size;
+
+		if (IS_ALIGNED(addr, PUD_SIZE) && gap >= PUD_SIZE &&
+		    mmu_psize_defs[MMU_PAGE_1G].shift)
+			mapping_size = PUD_SIZE;
+		else if (IS_ALIGNED(addr, PMD_SIZE) && gap >= PMD_SIZE &&
+			 mmu_psize_defs[MMU_PAGE_2M].shift)
+			mapping_size = PMD_SIZE;
+		else
+			mapping_size = PAGE_SIZE;
+
+		if (mapping_size != previous_size) {
+			print_mapping(start, addr, previous_size);
+			start = addr;
+		}
+
+		rc = radix__map_kernel_page((unsigned long)__va(addr), addr,
+					    PAGE_KERNEL_X, mapping_size);
+		if (rc)
+			return rc;
+	}
+
+	print_mapping(start, addr, mapping_size);
+	return 0;
+}
+
 static void __init radix_init_pgtable(void)
 {
-	int loop_count;
-	u64 base, end, start_addr;
 	unsigned long rts_field;
 	struct memblock_region *reg;
-	unsigned long linear_page_size;
 
 	/* We don't support slb for radix */
 	mmu_slb_size = 0;
 	/*
 	 * Create the linear mapping, using standard page size for now
 	 */
-	loop_count = 0;
-	for_each_memblock(memory, reg) {
-
-		start_addr = reg->base;
-
-redo:
-		if (loop_count < 1 && mmu_psize_defs[MMU_PAGE_1G].shift)
-			linear_page_size = PUD_SIZE;
-		else if (loop_count < 2 && mmu_psize_defs[MMU_PAGE_2M].shift)
-			linear_page_size = PMD_SIZE;
-		else
-			linear_page_size = PAGE_SIZE;
-
-		base = _ALIGN_UP(start_addr, linear_page_size);
-		end = _ALIGN_DOWN(reg->base + reg->size, linear_page_size);
-
-		pr_info("Mapping range 0x%lx - 0x%lx with 0x%lx\n",
-			(unsigned long)base, (unsigned long)end,
-			linear_page_size);
-
-		while (base < end) {
-			radix__map_kernel_page((unsigned long)__va(base),
-					      base, PAGE_KERNEL_X,
-					      linear_page_size);
-			base += linear_page_size;
-		}
-		/*
-		 * map the rest using lower page size
-		 */
-		if (end < reg->base + reg->size) {
-			start_addr = end;
-			loop_count++;
-			goto redo;
-		}
-	}
+	for_each_memblock(memory, reg)
+		WARN_ON(create_physical_mapping(reg->base,
+						reg->base + reg->size));
 	/*
 	 * Allocate Partition table and process table for the
 	 * host.
@@ -401,6 +414,8 @@ void __init radix__early_init_mmu(void)
 		mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
 		radix_init_partition_table();
 		radix_init_amor();
+	} else {
+		radix_init_pseries();
 	}
 
 	memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);
@@ -438,6 +453,7 @@ void radix__mmu_cleanup_all(void)
 		lpcr = mfspr(SPRN_LPCR);
 		mtspr(SPRN_LPCR, lpcr & ~LPCR_UPRT);
 		mtspr(SPRN_PTCR, 0);
+		powernv_set_nmmu_ptcr(0);
 		radix__flush_tlb_all();
 	}
 }
@@ -467,6 +483,173 @@ void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
 	memblock_set_current_limit(first_memblock_base + first_memblock_size);
 }
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+static void free_pte_table(pte_t *pte_start, pmd_t *pmd)
+{
+	pte_t *pte;
+	int i;
+
+	for (i = 0; i < PTRS_PER_PTE; i++) {
+		pte = pte_start + i;
+		if (!pte_none(*pte))
+			return;
+	}
+
+	pte_free_kernel(&init_mm, pte_start);
+	pmd_clear(pmd);
+}
+
+static void free_pmd_table(pmd_t *pmd_start, pud_t *pud)
+{
+	pmd_t *pmd;
+	int i;
+
+	for (i = 0; i < PTRS_PER_PMD; i++) {
+		pmd = pmd_start + i;
+		if (!pmd_none(*pmd))
+			return;
+	}
+
+	pmd_free(&init_mm, pmd_start);
+	pud_clear(pud);
+}
+
+static void remove_pte_table(pte_t *pte_start, unsigned long addr,
+			     unsigned long end)
+{
+	unsigned long next;
+	pte_t *pte;
+
+	pte = pte_start + pte_index(addr);
+	for (; addr < end; addr = next, pte++) {
+		next = (addr + PAGE_SIZE) & PAGE_MASK;
+		if (next > end)
+			next = end;
+
+		if (!pte_present(*pte))
+			continue;
+
+		if (!PAGE_ALIGNED(addr) || !PAGE_ALIGNED(next)) {
+			/*
+			 * The vmemmap_free() and remove_section_mapping()
+			 * codepaths call us with aligned addresses.
+			 */
+			WARN_ONCE(1, "%s: unaligned range\n", __func__);
+			continue;
+		}
+
+		pte_clear(&init_mm, addr, pte);
+	}
+}
+
+static void remove_pmd_table(pmd_t *pmd_start, unsigned long addr,
+			     unsigned long end)
+{
+	unsigned long next;
+	pte_t *pte_base;
+	pmd_t *pmd;
+
+	pmd = pmd_start + pmd_index(addr);
+	for (; addr < end; addr = next, pmd++) {
+		next = pmd_addr_end(addr, end);
+
+		if (!pmd_present(*pmd))
+			continue;
+
+		if (pmd_huge(*pmd)) {
+			if (!IS_ALIGNED(addr, PMD_SIZE) ||
+			    !IS_ALIGNED(next, PMD_SIZE)) {
+				WARN_ONCE(1, "%s: unaligned range\n", __func__);
+				continue;
+			}
+
+			pte_clear(&init_mm, addr, (pte_t *)pmd);
+			continue;
+		}
+
+		pte_base = (pte_t *)pmd_page_vaddr(*pmd);
+		remove_pte_table(pte_base, addr, next);
+		free_pte_table(pte_base, pmd);
+	}
+}
+
+static void remove_pud_table(pud_t *pud_start, unsigned long addr,
+			     unsigned long end)
+{
+	unsigned long next;
+	pmd_t *pmd_base;
+	pud_t *pud;
+
+	pud = pud_start + pud_index(addr);
+	for (; addr < end; addr = next, pud++) {
+		next = pud_addr_end(addr, end);
+
+		if (!pud_present(*pud))
+			continue;
+
+		if (pud_huge(*pud)) {
+			if (!IS_ALIGNED(addr, PUD_SIZE) ||
+			    !IS_ALIGNED(next, PUD_SIZE)) {
+				WARN_ONCE(1, "%s: unaligned range\n", __func__);
+				continue;
+			}
+
+			pte_clear(&init_mm, addr, (pte_t *)pud);
+			continue;
+		}
+
+		pmd_base = (pmd_t *)pud_page_vaddr(*pud);
+		remove_pmd_table(pmd_base, addr, next);
+		free_pmd_table(pmd_base, pud);
+	}
+}
+
+static void remove_pagetable(unsigned long start, unsigned long end)
+{
+	unsigned long addr, next;
+	pud_t *pud_base;
+	pgd_t *pgd;
+
+	spin_lock(&init_mm.page_table_lock);
+
+	for (addr = start; addr < end; addr = next) {
+		next = pgd_addr_end(addr, end);
+
+		pgd = pgd_offset_k(addr);
+		if (!pgd_present(*pgd))
+			continue;
+
+		if (pgd_huge(*pgd)) {
+			if (!IS_ALIGNED(addr, PGDIR_SIZE) ||
+			    !IS_ALIGNED(next, PGDIR_SIZE)) {
+				WARN_ONCE(1, "%s: unaligned range\n", __func__);
+				continue;
+			}
+
+			pte_clear(&init_mm, addr, (pte_t *)pgd);
+			continue;
+		}
+
+		pud_base = (pud_t *)pgd_page_vaddr(*pgd);
+		remove_pud_table(pud_base, addr, next);
+	}
+
+	spin_unlock(&init_mm.page_table_lock);
+	radix__flush_tlb_kernel_range(start, end);
+}
+
+int __ref radix__create_section_mapping(unsigned long start, unsigned long end)
+{
+	return create_physical_mapping(start, end);
+}
+
+int radix__remove_section_mapping(unsigned long start, unsigned long end)
+{
+	remove_pagetable(start, end);
+	return 0;
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 int __meminit radix__vmemmap_create_mapping(unsigned long start,
 				      unsigned long page_size,
@@ -482,7 +665,7 @@ int __meminit radix__vmemmap_create_mapping(unsigned long start,
 #ifdef CONFIG_MEMORY_HOTPLUG
 void radix__vmemmap_remove_mapping(unsigned long start, unsigned long page_size)
 {
-	/* FIXME!! intel does more. We should free page tables mapping vmemmap ? */
+	remove_pagetable(start, start + page_size);
 }
 #endif
 #endif