Merge tag 'xtensa-20151108' of git://github.com/czankel/xtensa-linux

Pull xtensa updates from Chris Zankel:

 - fix remaining issues with noMMU cores
 - fix build for cores w/o cache or zero overhead loop options
 - fix boot of secondary cores in SMP configuration
 - add support for DMA to high memory pages
 - add dma_to_phys and phys_to_dma functions.

* tag 'xtensa-20151108' of git://github.com/czankel/xtensa-linux:
  xtensa: implement dma_to_phys and phys_to_dma
  xtensa: support DMA to high memory
  Revert "xtensa: cache inquiry and unaligned cache handling functions"
  xtensa: drop unused sections and remapped reset handlers
  xtensa: fix secondary core boot in SMP
  xtensa: add FORCE_MAX_ZONEORDER to Kconfig
  xtensa: nommu: provide defconfig for de212 on kc705
  xtensa: nommu: xtfpga: add kc705 DTS
  xtensa: add de212 core variant
  xtensa: nommu: select HAVE_FUTEX_CMPXCHG
  xtensa: nommu: fix default memory start address
  xtensa: nommu: provide correct KIO addresses
  xtensa: nommu: fix USER_RING definition
  xtensa: xtfpga: fix integer overflow in TASK_SIZE
  xtensa: fix build for configs without cache options
  xtensa: fixes for configs without loop option

arch/xtensa/Kconfig

@@ -17,6 +17,7 @@ config XTENSA
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_ATTRS
 	select HAVE_FUNCTION_TRACER
+	select HAVE_FUTEX_CMPXCHG if !MMU
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_OPROFILE
 	select HAVE_PERF_EVENTS
@@ -397,6 +398,20 @@ config SIMDISK1_FILENAME
 
 source "mm/Kconfig"
 
+config FORCE_MAX_ZONEORDER
+	int "Maximum zone order"
+	default "11"
+	help
+	  The kernel memory allocator divides physically contiguous memory
+	  blocks into "zones", where each zone is a power of two number of
+	  pages.  This option selects the largest power of two that the kernel
+	  keeps in the memory allocator.  If you need to allocate very large
+	  blocks of physically contiguous memory, then you may need to
+	  increase this value.
+
+	  This config option is actually maximum order plus one. For example,
+	  a value of 11 means that the largest free memory block is 2^10 pages.
+
 source "drivers/pcmcia/Kconfig"
 
 source "drivers/pci/hotplug/Kconfig"
@@ -408,7 +423,7 @@ config DEFAULT_MEM_START
 	hex "Physical address of the default memory area start"
 	depends on PLATFORM_WANT_DEFAULT_MEM
 	default 0x00000000 if MMU
-	default 0x40000000 if !MMU
+	default 0x60000000 if !MMU
 	help
 	  This is a fallback start address of the default memory area, it is
 	  used when no physical memory size is passed through DTB or through

arch/xtensa/boot/boot-elf/boot.lds.S

@@ -40,17 +40,4 @@ SECTIONS
 		*(.bss)
 		__bss_end = .;
 	}
-
-#ifdef CONFIG_MMU
-	/*
-	 * This is a remapped copy of the Reset Vector Code.
-	 * It keeps gdb in sync with the PC after switching
-	 * to the temporary mapping used while setting up
-	 * the V2 MMU mappings for Linux.
-	 */
-	.ResetVector.remapped_text 0x46000000 (INFO):
-	{
-		*(.ResetVector.remapped_text)
-	}
-#endif
 }

arch/xtensa/boot/boot-elf/bootstrap.S

@@ -58,8 +58,6 @@ _SetupMMU:
 	wsr	a0, ps
 	rsync
 
-	Offset = _SetupMMU - _ResetVector
-
 #ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 	initialize_mmu
 #endif
@@ -74,29 +72,3 @@ reset:
 	movi	a3, 0
 	movi	a4, 0
 	jx      a0
-
-#ifdef CONFIG_MMU
-	.align 4
-
-	.section	.ResetVector.remapped_text, "x"
-	.global         _RemappedResetVector
-
-	/* Do org before literals */
-	.org 0
-
-_RemappedResetVector:
-	.begin  no-absolute-literals
-	.literal_position
-
-	_j	_RemappedSetupMMU
-
-	/* Position Remapped code at the same location as the original code */
-	. = _RemappedResetVector + Offset
-
-_RemappedSetupMMU:
-#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
-	initialize_mmu
-#endif
-
-	.end    no-absolute-literals
-#endif

arch/xtensa/boot/dts/kc705_nommu.dts

@@ -0,0 +1,17 @@
+/dts-v1/;
+/include/ "xtfpga.dtsi"
+/include/ "xtfpga-flash-128m.dtsi"
+
+/ {
+	compatible = "cdns,xtensa-kc705";
+	chosen {
+		bootargs = "earlycon=uart8250,mmio32,0x9d050020,115200n8 console=ttyS0,115200n8 ip=dhcp root=/dev/nfs rw debug";
+	};
+	memory@0 {
+		device_type = "memory";
+		reg = <0x60000000 0x10000000>;
+	};
+	soc {
+		ranges = <0x00000000 0x90000000 0x10000000>;
+	};
+};

arch/xtensa/configs/nommu_kc705_defconfig

@@ -0,0 +1,131 @@
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_FHANDLE=y
+CONFIG_IRQ_DOMAIN_DEBUG=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_IRQ_TIME_ACCOUNTING=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_CGROUP_DEBUG=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CPUSETS=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_MEMCG=y
+CONFIG_NAMESPACES=y
+CONFIG_SCHED_AUTOGROUP=y
+CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
+# CONFIG_RD_BZIP2 is not set
+# CONFIG_RD_LZMA is not set
+# CONFIG_RD_XZ is not set
+# CONFIG_RD_LZO is not set
+# CONFIG_RD_LZ4 is not set
+CONFIG_EXPERT=y
+CONFIG_SYSCTL_SYSCALL=y
+CONFIG_KALLSYMS_ALL=y
+CONFIG_PERF_EVENTS=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_IOSCHED_DEADLINE is not set
+# CONFIG_IOSCHED_CFQ is not set
+CONFIG_XTENSA_VARIANT_CUSTOM=y
+CONFIG_XTENSA_VARIANT_CUSTOM_NAME="de212"
+# CONFIG_XTENSA_VARIANT_MMU is not set
+CONFIG_XTENSA_UNALIGNED_USER=y
+CONFIG_PREEMPT=y
+# CONFIG_PCI is not set
+CONFIG_XTENSA_PLATFORM_XTFPGA=y
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE="earlycon=uart8250,mmio32,0x9d050020,115200n8 console=ttyS0,115200n8 ip=dhcp root=/dev/nfs rw debug"
+CONFIG_USE_OF=y
+CONFIG_BUILTIN_DTB="kc705_nommu"
+CONFIG_DEFAULT_MEM_SIZE=0x10000000
+CONFIG_BINFMT_FLAT=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_MULTICAST=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_IP_PNP_BOOTP=y
+CONFIG_IP_PNP_RARP=y
+# CONFIG_IPV6 is not set
+CONFIG_NETFILTER=y
+# CONFIG_WIRELESS is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+# CONFIG_STANDALONE is not set
+CONFIG_MTD=y
+CONFIG_MTD_CFI=y
+CONFIG_MTD_JEDECPROBE=y
+CONFIG_MTD_CFI_INTELEXT=y
+CONFIG_MTD_CFI_AMDSTD=y
+CONFIG_MTD_CFI_STAA=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_NETDEVICES=y
+# CONFIG_NET_VENDOR_ARC is not set
+# CONFIG_NET_VENDOR_BROADCOM is not set
+# CONFIG_NET_VENDOR_INTEL is not set
+# CONFIG_NET_VENDOR_MARVELL is not set
+# CONFIG_NET_VENDOR_MICREL is not set
+# CONFIG_NET_VENDOR_NATSEMI is not set
+# CONFIG_NET_VENDOR_SEEQ is not set
+# CONFIG_NET_VENDOR_STMICRO is not set
+# CONFIG_NET_VENDOR_VIA is not set
+# CONFIG_NET_VENDOR_WIZNET is not set
+CONFIG_MARVELL_PHY=y
+# CONFIG_WLAN is not set
+# CONFIG_INPUT_MOUSEDEV is not set
+# CONFIG_INPUT_KEYBOARD is not set
+# CONFIG_INPUT_MOUSE is not set
+# CONFIG_SERIO is not set
+CONFIG_SERIAL_8250=y
+# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_OF_PLATFORM=y
+CONFIG_HW_RANDOM=y
+# CONFIG_HWMON is not set
+CONFIG_WATCHDOG=y
+CONFIG_WATCHDOG_NOWAYOUT=y
+CONFIG_SOFT_WATCHDOG=y
+# CONFIG_VGA_CONSOLE is not set
+# CONFIG_USB_SUPPORT is not set
+CONFIG_EXT3_FS=y
+CONFIG_EXT4_FS=y
+CONFIG_FANOTIFY=y
+CONFIG_VFAT_FS=y
+CONFIG_JFFS2_FS=y
+CONFIG_NFS_FS=y
+CONFIG_NFS_V4=y
+CONFIG_NFS_SWAP=y
+CONFIG_ROOT_NFS=y
+CONFIG_SUNRPC_DEBUG=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_PRINTK_TIME=y
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_DEBUG_INFO=y
+# CONFIG_FRAME_POINTER is not set
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_DEBUG_VM=y
+CONFIG_DEBUG_NOMMU_REGIONS=y
+CONFIG_DEBUG_SHIRQ=y
+CONFIG_LOCKUP_DETECTOR=y
+CONFIG_SCHEDSTATS=y
+CONFIG_TIMER_STATS=y
+CONFIG_DEBUG_RT_MUTEXES=y
+CONFIG_DEBUG_SPINLOCK=y
+CONFIG_DEBUG_MUTEXES=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_STACKTRACE=y
+# CONFIG_RCU_CPU_STALL_INFO is not set
+CONFIG_RCU_TRACE=y
+# CONFIG_FTRACE is not set
+# CONFIG_LD_NO_RELAX is not set
+# CONFIG_CRYPTO_ECHAINIV is not set
+CONFIG_CRYPTO_ANSI_CPRNG=y

arch/xtensa/include/asm/asmmacro.h

@@ -35,9 +35,10 @@
  * __loop  as
  *	   restart loop. 'as' register must not have been modified!
  *
- * __endla ar, at, incr
+ * __endla ar, as, incr
  *	   ar	start address (modified)
- *	   as	scratch register used by macro
+ *	   as	scratch register used by __loops/__loopi macros or
+ *		end address used by __loopt macro
  *	   inc	increment
  */
 
@@ -97,7 +98,7 @@
 	.endm
 
 /*
- * loop from ar to ax
+ * loop from ar to as
  */
 
 	.macro	__loopt	ar, as, at, incr_log2

arch/xtensa/include/asm/cacheasm.h

@@ -73,7 +73,9 @@
 
 	.macro	___unlock_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at diu XCHAL_DCACHE_SIZE XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
@@ -90,87 +92,111 @@
 
 	.macro	___flush_invalidate_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at diwbi XCHAL_DCACHE_SIZE XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___flush_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at diwb XCHAL_DCACHE_SIZE XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at dii __stringify(DCACHE_WAY_SIZE) \
 			 XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_icache_all ar at
 
+#if XCHAL_ICACHE_SIZE
 	__loop_cache_all \ar \at iii __stringify(ICACHE_WAY_SIZE) \
 			 XCHAL_ICACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 
 	.macro	___flush_invalidate_dcache_range ar as at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_range \ar \as \at dhwbi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___flush_dcache_range ar as at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_range \ar \as \at dhwb XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_dcache_range ar as at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_range \ar \as \at dhi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_icache_range ar as at
 
+#if XCHAL_ICACHE_SIZE
 	__loop_cache_range \ar \as \at ihi XCHAL_ICACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 
 	.macro	___flush_invalidate_dcache_page ar as
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_page \ar \as dhwbi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro ___flush_dcache_page ar as
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_page \ar \as dhwb XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_dcache_page ar as
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_page \ar \as dhi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_icache_page ar as
 
+#if XCHAL_ICACHE_SIZE
 	__loop_cache_page \ar \as ihi XCHAL_ICACHE_LINEWIDTH
+#endif
 
 	.endm