[v3,5/8] mm: HUGE_VMAP arch support cleanup
diff mbox series

Message ID 20200810022732.1150009-6-npiggin@gmail.com
State New
Headers show
Series
  • huge vmalloc mappings
Related show

Commit Message

Nicholas Piggin Aug. 10, 2020, 2:27 a.m. UTC
This changes the awkward approach where architectures provide init
functions to determine which levels they can provide large mappings for,
to one where the arch is queried for each call.

This removes code and indirection, and allows constant-folding of dead
code for unsupported levels.

This also adds a prot argument to the arch query. This is unused
currently but could help with some architectures (e.g., some powerpc
processors can't map uncacheable memory with large pages).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/arm64/mm/mmu.c                      | 10 +--
 arch/powerpc/mm/book3s64/radix_pgtable.c |  8 +-
 arch/x86/mm/ioremap.c                    | 10 +--
 include/linux/io.h                       |  9 ---
 include/linux/vmalloc.h                  | 10 +++
 init/main.c                              |  1 -
 mm/ioremap.c                             | 96 +++++++++++-------------
 7 files changed, 67 insertions(+), 77 deletions(-)

Comments

kernel test robot Aug. 10, 2020, 3:58 a.m. UTC | #1
Hi Nicholas,

I love your patch! Yet something to improve:

[auto build test ERROR on hnaz-linux-mm/master]
[also build test ERROR on arm64/for-next/core powerpc/next tip/x86/mm linus/master v5.8 next-20200807]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Nicholas-Piggin/huge-vmalloc-mappings/20200810-103105
base:   https://github.com/hnaz/linux-mm master
config: i386-randconfig-s002-20200810 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-118-ge1578773-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> arch/x86/mm/ioremap.c:484:6: error: redefinition of 'arch_vmap_p4d_supported'
     484 | bool arch_vmap_p4d_supported(pgprot_t prot)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/io.h:911,
                    from arch/x86/include/asm/io.h:375,
                    from arch/x86/include/asm/dma.h:13,
                    from include/linux/memblock.h:14,
                    from arch/x86/mm/ioremap.c:10:
   include/linux/vmalloc.h:92:20: note: previous definition of 'arch_vmap_p4d_supported' was here
      92 | static inline bool arch_vmap_p4d_supported(pgprot_t prot) { return false; }
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/ioremap.c:489:6: error: redefinition of 'arch_vmap_pud_supported'
     489 | bool arch_vmap_pud_supported(pgprot_t prot)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/io.h:911,
                    from arch/x86/include/asm/io.h:375,
                    from arch/x86/include/asm/dma.h:13,
                    from include/linux/memblock.h:14,
                    from arch/x86/mm/ioremap.c:10:
   include/linux/vmalloc.h:93:20: note: previous definition of 'arch_vmap_pud_supported' was here
      93 | static inline bool arch_vmap_pud_supported(pgprot_t prot) { return false; }
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/ioremap.c:498:6: error: redefinition of 'arch_vmap_pmd_supported'
     498 | bool arch_vmap_pmd_supported(pgprot_t prot)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/io.h:911,
                    from arch/x86/include/asm/io.h:375,
                    from arch/x86/include/asm/dma.h:13,
                    from include/linux/memblock.h:14,
                    from arch/x86/mm/ioremap.c:10:
   include/linux/vmalloc.h:94:20: note: previous definition of 'arch_vmap_pmd_supported' was here
      94 | static inline bool arch_vmap_pmd_supported(pgprot_t prot) { return false; }
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/mm/ioremap.c:737:17: warning: no previous prototype for 'early_memremap_pgprot_adjust' [-Wmissing-prototypes]
     737 | pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/arch_vmap_p4d_supported +484 arch/x86/mm/ioremap.c

   483	
 > 484	bool arch_vmap_p4d_supported(pgprot_t prot)
   485	{
   486		return false;
   487	}
   488	
 > 489	bool arch_vmap_pud_supported(pgprot_t prot)
   490	{
   491	#ifdef CONFIG_X86_64
   492		return boot_cpu_has(X86_FEATURE_GBPAGES);
   493	#else
   494		return false;
   495	#endif
   496	}
   497	
 > 498	bool arch_vmap_pmd_supported(pgprot_t prot)
   499	{
   500		return boot_cpu_has(X86_FEATURE_PSE);
   501	}
   502	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Patch
diff mbox series

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 75df62fea1b6..184a6e917417 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1304,12 +1304,12 @@  void *__init fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
 	return dt_virt;
 }
 
-int __init arch_ioremap_p4d_supported(void)
+bool arch_vmap_p4d_supported(pgprot_t prot)
 {
-	return 0;
+	return false;
 }
 
-int __init arch_ioremap_pud_supported(void)
+bool arch_vmap_pud_supported(pgprot_t prot)
 {
 	/*
 	 * Only 4k granule supports level 1 block mappings.
@@ -1319,9 +1319,9 @@  int __init arch_ioremap_pud_supported(void)
 	       !IS_ENABLED(CONFIG_PTDUMP_DEBUGFS);
 }
 
-int __init arch_ioremap_pmd_supported(void)
+bool arch_vmap_pmd_supported(pgprot_t prot)
 {
-	/* See arch_ioremap_pud_supported() */
+	/* See arch_vmap_pud_supported() */
 	return !IS_ENABLED(CONFIG_PTDUMP_DEBUGFS);
 }
 
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 28c784976bed..eca83a50bf2e 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -1134,13 +1134,13 @@  void radix__ptep_modify_prot_commit(struct vm_area_struct *vma,
 	set_pte_at(mm, addr, ptep, pte);
 }
 
-int __init arch_ioremap_pud_supported(void)
+bool arch_vmap_pud_supported(pgprot_t prot)
 {
 	/* HPT does not cope with large pages in the vmalloc area */
 	return radix_enabled();
 }
 
-int __init arch_ioremap_pmd_supported(void)
+bool arch_vmap_pmd_supported(pgprot_t prot)
 {
 	return radix_enabled();
 }
@@ -1234,7 +1234,7 @@  int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
 	return 1;
 }
 
-int __init arch_ioremap_p4d_supported(void)
+bool arch_vmap_p4d_supported(pgprot_t prot)
 {
-	return 0;
+	return false;
 }
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 84d85dbd1dad..159bfca757b9 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -481,21 +481,21 @@  void iounmap(volatile void __iomem *addr)
 }
 EXPORT_SYMBOL(iounmap);
 
-int __init arch_ioremap_p4d_supported(void)
+bool arch_vmap_p4d_supported(pgprot_t prot)
 {
-	return 0;
+	return false;
 }
 
-int __init arch_ioremap_pud_supported(void)
+bool arch_vmap_pud_supported(pgprot_t prot)
 {
 #ifdef CONFIG_X86_64
 	return boot_cpu_has(X86_FEATURE_GBPAGES);
 #else
-	return 0;
+	return false;
 #endif
 }
 
-int __init arch_ioremap_pmd_supported(void)
+bool arch_vmap_pmd_supported(pgprot_t prot)
 {
 	return boot_cpu_has(X86_FEATURE_PSE);
 }
diff --git a/include/linux/io.h b/include/linux/io.h
index 8394c56babc2..f1effd4d7a3c 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -31,15 +31,6 @@  static inline int ioremap_page_range(unsigned long addr, unsigned long end,
 }
 #endif
 
-#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
-void __init ioremap_huge_init(void);
-int arch_ioremap_p4d_supported(void);
-int arch_ioremap_pud_supported(void);
-int arch_ioremap_pmd_supported(void);
-#else
-static inline void ioremap_huge_init(void) { }
-#endif
-
 /*
  * Managed iomap interface
  */
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 0221f852a7e1..787d77ad7536 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -84,6 +84,16 @@  struct vmap_area {
 	};
 };
 
+#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+bool arch_vmap_p4d_supported(pgprot_t prot);
+bool arch_vmap_pud_supported(pgprot_t prot);
+bool arch_vmap_pmd_supported(pgprot_t prot);
+#else
+static inline bool arch_vmap_p4d_supported(pgprot_t prot) { return false; }
+static inline bool arch_vmap_pud_supported(pgprot_t prot) { return false; }
+static inline bool arch_vmap_pmd_supported(pgprot_t prot) { return false; }
+#endif
+
 /*
  *	Highlevel APIs for driver use
  */
diff --git a/init/main.c b/init/main.c
index ae78fb68d231..1c89aa127b8f 100644
--- a/init/main.c
+++ b/init/main.c
@@ -820,7 +820,6 @@  static void __init mm_init(void)
 	pgtable_init();
 	debug_objects_mem_init();
 	vmalloc_init();
-	ioremap_huge_init();
 	/* Should be run before the first non-init thread is created */
 	init_espfix_bsp();
 	/* Should be run after espfix64 is set up. */
diff --git a/mm/ioremap.c b/mm/ioremap.c
index 6016ae3227ad..b0032dbadaf7 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -16,49 +16,16 @@ 
 #include "pgalloc-track.h"
 
 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
-static int __read_mostly ioremap_p4d_capable;
-static int __read_mostly ioremap_pud_capable;
-static int __read_mostly ioremap_pmd_capable;
-static int __read_mostly ioremap_huge_disabled;
+static bool __ro_after_init iomap_allow_huge = true;
 
 static int __init set_nohugeiomap(char *str)
 {
-	ioremap_huge_disabled = 1;
+	iomap_allow_huge = false;
 	return 0;
 }
 early_param("nohugeiomap", set_nohugeiomap);
-
-void __init ioremap_huge_init(void)
-{
-	if (!ioremap_huge_disabled) {
-		if (arch_ioremap_p4d_supported())
-			ioremap_p4d_capable = 1;
-		if (arch_ioremap_pud_supported())
-			ioremap_pud_capable = 1;
-		if (arch_ioremap_pmd_supported())
-			ioremap_pmd_capable = 1;
-	}
-}
-
-static inline int ioremap_p4d_enabled(void)
-{
-	return ioremap_p4d_capable;
-}
-
-static inline int ioremap_pud_enabled(void)
-{
-	return ioremap_pud_capable;
-}
-
-static inline int ioremap_pmd_enabled(void)
-{
-	return ioremap_pmd_capable;
-}
-
-#else	/* !CONFIG_HAVE_ARCH_HUGE_VMAP */
-static inline int ioremap_p4d_enabled(void) { return 0; }
-static inline int ioremap_pud_enabled(void) { return 0; }
-static inline int ioremap_pmd_enabled(void) { return 0; }
+#else /* CONFIG_HAVE_ARCH_HUGE_VMAP */
+static const bool iomap_allow_huge = false;
 #endif	/* CONFIG_HAVE_ARCH_HUGE_VMAP */
 
 static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
@@ -81,9 +48,12 @@  static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 }
 
 static int vmap_try_huge_pmd(pmd_t *pmd, unsigned long addr, unsigned long end,
-			phys_addr_t phys_addr, pgprot_t prot)
+			phys_addr_t phys_addr, pgprot_t prot, unsigned int max_page_shift)
 {
-	if (!ioremap_pmd_enabled())
+	if (max_page_shift < PMD_SHIFT)
+		return 0;
+
+	if (!arch_vmap_pmd_supported(prot))
 		return 0;
 
 	if ((end - addr) != PMD_SIZE)
@@ -102,7 +72,8 @@  static int vmap_try_huge_pmd(pmd_t *pmd, unsigned long addr, unsigned long end,
 }
 
 static int vmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
-			phys_addr_t phys_addr, pgprot_t prot, pgtbl_mod_mask *mask)
+			phys_addr_t phys_addr, pgprot_t prot, unsigned int max_page_shift,
+			pgtbl_mod_mask *mask)
 {
 	pmd_t *pmd;
 	unsigned long next;
@@ -113,7 +84,7 @@  static int vmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
 	do {
 		next = pmd_addr_end(addr, end);
 
-		if (vmap_try_huge_pmd(pmd, addr, next, phys_addr, prot)) {
+		if (vmap_try_huge_pmd(pmd, addr, next, phys_addr, prot, max_page_shift)) {
 			*mask |= PGTBL_PMD_MODIFIED;
 			continue;
 		}
@@ -125,9 +96,12 @@  static int vmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
 }
 
 static int vmap_try_huge_pud(pud_t *pud, unsigned long addr, unsigned long end,
-			phys_addr_t phys_addr, pgprot_t prot)
+			phys_addr_t phys_addr, pgprot_t prot, unsigned int max_page_shift)
 {
-	if (!ioremap_pud_enabled())
+	if (max_page_shift < PUD_SHIFT)
+		return 0;
+
+	if (!arch_vmap_pud_supported(prot))
 		return 0;
 
 	if ((end - addr) != PUD_SIZE)
@@ -146,7 +120,8 @@  static int vmap_try_huge_pud(pud_t *pud, unsigned long addr, unsigned long end,
 }
 
 static int vmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
-			phys_addr_t phys_addr, pgprot_t prot, pgtbl_mod_mask *mask)
+			phys_addr_t phys_addr, pgprot_t prot, unsigned int max_page_shift,
+			pgtbl_mod_mask *mask)
 {
 	pud_t *pud;
 	unsigned long next;
@@ -157,21 +132,24 @@  static int vmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
 	do {
 		next = pud_addr_end(addr, end);
 
-		if (vmap_try_huge_pud(pud, addr, next, phys_addr, prot)) {
+		if (vmap_try_huge_pud(pud, addr, next, phys_addr, prot, max_page_shift)) {
 			*mask |= PGTBL_PUD_MODIFIED;
 			continue;
 		}
 
-		if (vmap_pmd_range(pud, addr, next, phys_addr, prot, mask))
+		if (vmap_pmd_range(pud, addr, next, phys_addr, prot, max_page_shift, mask))
 			return -ENOMEM;
 	} while (pud++, phys_addr += (next - addr), addr = next, addr != end);
 	return 0;
 }
 
 static int vmap_try_huge_p4d(p4d_t *p4d, unsigned long addr, unsigned long end,
-			phys_addr_t phys_addr, pgprot_t prot)
+			phys_addr_t phys_addr, pgprot_t prot, unsigned int max_page_shift)
 {
-	if (!ioremap_p4d_enabled())
+	if (max_page_shift < P4D_SHIFT)
+		return 0;
+
+	if (!arch_vmap_p4d_supported(prot))
 		return 0;
 
 	if ((end - addr) != P4D_SIZE)
@@ -190,7 +168,8 @@  static int vmap_try_huge_p4d(p4d_t *p4d, unsigned long addr, unsigned long end,
 }
 
 static int vmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
-			phys_addr_t phys_addr, pgprot_t prot, pgtbl_mod_mask *mask)
+			phys_addr_t phys_addr, pgprot_t prot, unsigned int max_page_shift,
+			pgtbl_mod_mask *mask)
 {
 	p4d_t *p4d;
 	unsigned long next;
@@ -201,18 +180,19 @@  static int vmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
 	do {
 		next = p4d_addr_end(addr, end);
 
-		if (vmap_try_huge_p4d(p4d, addr, next, phys_addr, prot)) {
+		if (vmap_try_huge_p4d(p4d, addr, next, phys_addr, prot, max_page_shift)) {
 			*mask |= PGTBL_P4D_MODIFIED;
 			continue;
 		}
 
-		if (vmap_pud_range(p4d, addr, next, phys_addr, prot, mask))
+		if (vmap_pud_range(p4d, addr, next, phys_addr, prot, max_page_shift, mask))
 			return -ENOMEM;
 	} while (p4d++, phys_addr += (next - addr), addr = next, addr != end);
 	return 0;
 }
 
-int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
+static int vmap_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
+			unsigned int max_page_shift)
 {
 	pgd_t *pgd;
 	unsigned long start;
@@ -227,7 +207,7 @@  int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_a
 	pgd = pgd_offset_k(addr);
 	do {
 		next = pgd_addr_end(addr, end);
-		err = vmap_p4d_range(pgd, addr, next, phys_addr, prot, &mask);
+		err = vmap_p4d_range(pgd, addr, next, phys_addr, prot, max_page_shift, &mask);
 		if (err)
 			break;
 	} while (pgd++, phys_addr += (next - addr), addr = next, addr != end);
@@ -240,6 +220,16 @@  int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_a
 	return err;
 }
 
+int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
+{
+	unsigned int max_page_shift = PAGE_SHIFT;
+
+	if (iomap_allow_huge)
+		max_page_shift = P4D_SHIFT;
+
+	return vmap_range(addr, end, phys_addr, prot, max_page_shift);
+}
+
 #ifdef CONFIG_GENERIC_IOREMAP
 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
 {