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OpenRISC updates for v4.15

Browse Source 
Small Things:
  - Move OpenRISC docs into Documentation and clean them up
  - Document previously undocumented devicetree bindings
  - Update the or1ksim dts to use stdout-path
 
 OpenRISC SMP support details:
  - First the "use shadow registers" and "define CPU_BIG_ENDIAN as true"
    get the architecture ready for SMP.
  - The "add 1 and 2 byte cmpxchg support" and "use qspinlocks and
    qrwlocks" add the SMP locking infrastructure as needed.  Using the
    qspinlocks and qrwlocks as suggested by Peter Z while reviewing the
    original spinlocks implementation.
  - The "support for ompic" adds a new irqchip device which is used for
    IPI communication to support SMP.
  - The "initial SMP support" adds smp.c and makes changes to all of the
    necessary data-structures to be per-cpu.
  - The remaining patches are bug fixes and debug helpers which I wanted
    to keep separate from the "initial SMP support" in order to allow them
    to be reviewed on their own. This includes:
     - add cacheflush support to fix icache aliasing
     - fix initial preempt state for secondary cpu tasks
     - sleep instead of spin on secondary wait
     - support framepointers and STACKTRACE_SUPPORT
     - enable LOCKDEP_SUPPORT and irqflags tracing
     - timer sync: Add tick timer sync logic
     - fix possible deadlock in timer sync, pointed out by mips guys
 
 Note: the irqchip patch was reviewed with Marc and we agreed to push it
 together with these patches.
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Merge tag 'for-linus' of git://github.com/openrisc/linux

Pull OpenRISC updates from Stafford Horne:
 "The OpenRISC work is a bit more interesting this time, adding SMP
  support and a few general cleanups.

  Small Things:

   - Move OpenRISC docs into Documentation and clean them up

   - Document previously undocumented devicetree bindings

   - Update the or1ksim dts to use stdout-path

  OpenRISC SMP support details:

   - First the "use shadow registers" and "define CPU_BIG_ENDIAN as
     true" get the architecture ready for SMP.

   - The "add 1 and 2 byte cmpxchg support" and "use qspinlocks and
     qrwlocks" add the SMP locking infrastructure as needed. Using the
     qspinlocks and qrwlocks as suggested by Peter Z while reviewing the
     original spinlocks implementation.

   - The "support for ompic" adds a new irqchip device which is used for
     IPI communication to support SMP.

   - The "initial SMP support" adds smp.c and makes changes to all of
     the necessary data-structures to be per-cpu.

  The remaining patches are bug fixes and debug helpers which I wanted
  to keep separate from the "initial SMP support" in order to allow them
  to be reviewed on their own. This includes:

   - add cacheflush support to fix icache aliasing

   - fix initial preempt state for secondary cpu tasks

   - sleep instead of spin on secondary wait

   - support framepointers and STACKTRACE_SUPPORT

   - enable LOCKDEP_SUPPORT and irqflags tracing

   - timer sync: Add tick timer sync logic

   - fix possible deadlock in timer sync, pointed out by mips guys

  Note: the irqchip patch was reviewed with Marc and we agreed to push
  it together with these patches"

* tag 'for-linus' of git://github.com/openrisc/linux:
  openrisc: fix possible deadlock scenario during timer sync
  openrisc: pass endianness info to sparse
  openrisc: add tick timer multi-core sync logic
  openrisc: enable LOCKDEP_SUPPORT and irqflags tracing
  openrisc: support framepointers and STACKTRACE_SUPPORT
  openrisc: add simple_smp dts and defconfig for simulators
  openrisc: add cacheflush support to fix icache aliasing
  openrisc: sleep instead of spin on secondary wait
  openrisc: fix initial preempt state for secondary cpu tasks
  openrisc: initial SMP support
  irqchip: add initial support for ompic
  dt-bindings: add openrisc to vendor prefixes list
  openrisc: use qspinlocks and qrwlocks
  openrisc: add 1 and 2 byte cmpxchg support
  openrisc: use shadow registers to save regs on exception
  dt-bindings: openrisc: Add OpenRISC platform SoC
  Documentation: openrisc: Updates to README
  Documentation: Move OpenRISC docs out of arch/
  MAINTAINERS: Add OpenRISC pic maintainer
  openrisc: dts: or1ksim: Add stdout-path
This commit is contained in:
Linus Torvalds 2017-11-13 12:12:00 -08:00
commit f3573b8f90
46 changed files with 1944 additions and 266 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
Documentation/devicetree/bindings/interrupt-controller/openrisc,ompic.txt Normal file
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@ -0,0 +1,22 @@
Open Multi-Processor Interrupt Controller
Required properties:
- compatible : This should be "openrisc,ompic"
- reg : Specifies base physical address and size of the register space. The
size is based on the number of cores the controller has been configured
to handle, this should be set to 8 bytes per cpu core.
- interrupt-controller : Identifies the node as an interrupt controller.
- #interrupt-cells : This should be set to 0 as this will not be an irq
parent.
- interrupts : Specifies the interrupt line to which the ompic is wired.
Example:
ompic: interrupt-controller@98000000 {
compatible = "openrisc,ompic";
reg = <0x98000000 16>;
interrupt-controller;
#interrupt-cells = <0>;
interrupts = <1>;
};

39
Documentation/devicetree/bindings/openrisc/opencores/or1ksim.txt Normal file
View File

@ -0,0 +1,39 @@
OpenRISC Generic SoC
====================
Boards and FPGA SoC's which support the OpenRISC standard platform. The
platform essentially follows the conventions of the OpenRISC architecture
specification, however some aspects, such as the boot protocol have been defined
by the Linux port.
Required properties
-------------------
- compatible: Must include "opencores,or1ksim"
CPU nodes:
----------
A "cpus" node is required. Required properties:
- #address-cells: Must be 1.
- #size-cells: Must be 0.
A CPU sub-node is also required for at least CPU 0. Since the topology may
be probed via CPS, it is not necessary to specify secondary CPUs. Required
properties:
- compatible: Must be "opencores,or1200-rtlsvn481".
- reg: CPU number.
- clock-frequency: The CPU clock frequency in Hz.
Example:
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu@0 {
compatible = "opencores,or1200-rtlsvn481";
reg = <0>;
clock-frequency = <20000000>;
};
};
Boot protocol
-------------
The bootloader may pass the following arguments to the kernel:
- r3: address of a flattened device-tree blob or 0x0.

1
Documentation/devicetree/bindings/vendor-prefixes.txt
View File

@ -246,6 +246,7 @@ onion Onion Corporation
onnn ON Semiconductor Corp.
ontat On Tat Industrial Company
opencores OpenCores.org
openrisc OpenRISC.io
option Option NV
ORCL Oracle Corporation
ortustech Ortus Technology Co., Ltd.

67
arch/openrisc/README.openrisc → Documentation/openrisc/README
View File

@ -7,13 +7,7 @@ target architecture, specifically, is the 32-bit OpenRISC 1000 family (or1k).
For information about OpenRISC processors and ongoing development:
website http://openrisc.io
For more information about Linux on OpenRISC, please contact South Pole AB.
email: info@southpole.se
website: http://southpole.se
http://southpoleconsulting.com
email openrisc@lists.librecores.org
---------------------------------------------------------------------
@ -24,37 +18,54 @@ In order to build and run Linux for OpenRISC, you'll need at least a basic
toolchain and, perhaps, the architectural simulator. Steps to get these bits
in place are outlined here.
1) The toolchain can be obtained from openrisc.io. Instructions for building
a toolchain can be found at:
1) Toolchain
https://github.com/openrisc/tutorials
Toolchain binaries can be obtained from openrisc.io or our github releases page.
Instructions for building the different toolchains can be found on openrisc.io
or Stafford's toolchain build and release scripts.
2) or1ksim (optional)
binaries https://github.com/openrisc/or1k-gcc/releases
toolchains https://openrisc.io/software
building https://github.com/stffrdhrn/or1k-toolchain-build
or1ksim is the architectural simulator which will allow you to actually run
your OpenRISC Linux kernel if you don't have an OpenRISC processor at hand.
2) Building
git clone https://github.com/openrisc/or1ksim.git
cd or1ksim
./configure --prefix=$OPENRISC_PREFIX
make
make install
3) Linux kernel
Build the kernel as usual
Build the Linux kernel as usual
make ARCH=openrisc defconfig
make ARCH=openrisc
4) Run in architectural simulator
3) Running on FPGA (optional)
Grab the or1ksim platform configuration file (from the or1ksim source) and
together with your freshly built vmlinux, run your kernel with the following
incantation:
The OpenRISC community typically uses FuseSoC to manage building and programming
an SoC into an FPGA. The below is an example of programming a De0 Nano
development board with the OpenRISC SoC. During the build FPGA RTL is code
downloaded from the FuseSoC IP cores repository and built using the FPGA vendor
tools. Binaries are loaded onto the board with openocd.
sim -f arch/openrisc/or1ksim.cfg vmlinux
git clone https://github.com/olofk/fusesoc
cd fusesoc
sudo pip install -e .
fusesoc init
fusesoc build de0_nano
fusesoc pgm de0_nano
openocd -f interface/altera-usb-blaster.cfg \
-f board/or1k_generic.cfg
telnet localhost 4444
> init
> halt; load_image vmlinux ; reset
4) Running on a Simulator (optional)
QEMU is a processor emulator which we recommend for simulating the OpenRISC
platform. Please follow the OpenRISC instructions on the QEMU website to get
Linux running on QEMU. You can build QEMU yourself, but your Linux distribution
likely provides binary packages to support OpenRISC.
qemu openrisc https://wiki.qemu.org/Documentation/Platforms/OpenRISC
---------------------------------------------------------------------

0
arch/openrisc/TODO.openrisc → Documentation/openrisc/TODO
View File

4
MAINTAINERS
View File

@ -10037,7 +10037,11 @@ T: git git://github.com/openrisc/linux.git
L: openrisc@lists.librecores.org
W: http://openrisc.io
S: Maintained
F: Documentation/devicetree/bindings/openrisc/
F: Documentation/openrisc/
F: arch/openrisc/
F: drivers/irqchip/irq-ompic.c
F: drivers/irqchip/irq-or1k-*
OPENVSWITCH
M: Pravin Shelar <pshelar@nicira.com>

49
arch/openrisc/Kconfig
View File

@ -22,13 +22,19 @@ config OPENRISC
select HAVE_UID16
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_CLOCKEVENTS_BROADCAST
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_SMP_IDLE_THREAD
select MODULES_USE_ELF_RELA
select HAVE_DEBUG_STACKOVERFLOW
select OR1K_PIC
select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1
select NO_BOOTMEM
select ARCH_USE_QUEUED_SPINLOCKS
select ARCH_USE_QUEUED_RWLOCKS
select OMPIC if SMP
select ARCH_WANT_FRAME_POINTERS
config CPU_BIG_ENDIAN
def_bool y
@ -56,6 +62,12 @@ config TRACE_IRQFLAGS_SUPPORT
config GENERIC_CSUM
def_bool y
config STACKTRACE_SUPPORT
def_bool y
config LOCKDEP_SUPPORT
def_bool y
source "init/Kconfig"
source "kernel/Kconfig.freezer"
@ -73,6 +85,17 @@ config OR1K_1200
endchoice
config DCACHE_WRITETHROUGH
bool "Have write through data caches"
default n
help
Select this if your implementation features write through data caches.
Selecting 'N' here will allow the kernel to force flushing of data
caches at relevant times. Most OpenRISC implementations support write-
through data caches.
If unsure say N here
config OPENRISC_BUILTIN_DTB
string "Builtin DTB"
default ""
@ -105,8 +128,19 @@ config OPENRISC_HAVE_INST_DIV
endmenu
config NR_CPUS
int
default "1"
int "Maximum number of CPUs (2-32)"
range 2 32
depends on SMP
default "2"
config SMP
bool "Symmetric Multi-Processing support"
help
This enables support for systems with more than one CPU. If you have
a system with only one CPU, say N. If you have a system with more
than one CPU, say Y.
If you don't know what to do here, say N.
source kernel/Kconfig.hz
source kernel/Kconfig.preempt
@ -125,6 +159,17 @@ config OPENRISC_NO_SPR_SR_DSX
Say N here if you know that your OpenRISC processor has
SPR_SR_DSX bit implemented. Say Y if you are unsure.
config OPENRISC_HAVE_SHADOW_GPRS
bool "Support for shadow gpr files" if !SMP
default y if SMP
help
Say Y here if your OpenRISC processor features shadowed
register files. They will in such case be used as a
scratch reg storage on exception entry.
On SMP systems, this feature is mandatory.
On a unicore system it's safe to say N here if you are unsure.
config CMDLINE
string "Default kernel command string"
default ""

1
arch/openrisc/Makefile
View File

@ -25,6 +25,7 @@ LDFLAGS_vmlinux :=
LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
KBUILD_CFLAGS += -pipe -ffixed-r10 -D__linux__
CHECKFLAGS += -mbig-endian
ifeq ($(CONFIG_OPENRISC_HAVE_INST_MUL),y)
KBUILD_CFLAGS += $(call cc-option,-mhard-mul)

7
arch/openrisc/boot/dts/or1ksim.dts
View File

@ -6,8 +6,13 @@
#size-cells = <1>;
interrupt-parent = <&pic>;
aliases {
uart0 = &serial0;
};
chosen {
bootargs = "console=uart,mmio,0x90000000,115200";
bootargs = "earlycon";
stdout-path = "uart0:115200";
};
memory@0 {

63
arch/openrisc/boot/dts/simple_smp.dts Normal file
View File

@ -0,0 +1,63 @@
/dts-v1/;
/ {
compatible = "opencores,or1ksim";
#address-cells = <1>;
#size-cells = <1>;
interrupt-parent = <&pic>;
aliases {
uart0 = &serial0;
};
chosen {
bootargs = "earlycon";
stdout-path = "uart0:115200";
};
memory@0 {
device_type = "memory";
reg = <0x00000000 0x02000000>;
};
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu@0 {
compatible = "opencores,or1200-rtlsvn481";
reg = <0>;
clock-frequency = <20000000>;
};
cpu@1 {
compatible = "opencores,or1200-rtlsvn481";
reg = <1>;
clock-frequency = <20000000>;
};
};
ompic: ompic@98000000 {
compatible = "openrisc,ompic";
reg = <0x98000000 16>;
interrupt-controller;
#interrupt-cells = <0>;
interrupts = <1>;
};
/*
* OR1K PIC is built into CPU and accessed via special purpose
* registers. It is not addressable and, hence, has no 'reg'
* property.
*/
pic: pic {
compatible = "opencores,or1k-pic-level";
#interrupt-cells = <1>;
interrupt-controller;
};
serial0: serial@90000000 {
compatible = "opencores,uart16550-rtlsvn105", "ns16550a";
reg = <0x90000000 0x100>;
interrupts = <2>;
clock-frequency = <20000000>;
};
};

66
arch/openrisc/configs/simple_smp_defconfig Normal file
View File

@ -0,0 +1,66 @@
CONFIG_CROSS_COMPILE="or1k-linux-"
CONFIG_LOCALVERSION="-simple-smp"
CONFIG_NO_HZ=y
CONFIG_LOG_BUF_SHIFT=14
CONFIG_BLK_DEV_INITRD=y
# CONFIG_RD_GZIP is not set
# 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_KALLSYMS is not set
# CONFIG_EPOLL is not set
# CONFIG_TIMERFD is not set
# CONFIG_EVENTFD is not set
# CONFIG_AIO is not set
# CONFIG_VM_EVENT_COUNTERS is not set
# CONFIG_COMPAT_BRK is not set
CONFIG_SLOB=y
CONFIG_MODULES=y
# CONFIG_BLOCK is not set
CONFIG_OPENRISC_BUILTIN_DTB="simple_smp"
CONFIG_SMP=y
CONFIG_HZ_100=y
CONFIG_OPENRISC_HAVE_SHADOW_GPRS=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
# CONFIG_INET_XFRM_MODE_TUNNEL is not set
# CONFIG_INET_XFRM_MODE_BEET is not set
# CONFIG_INET_DIAG is not set
CONFIG_TCP_CONG_ADVANCED=y
# CONFIG_TCP_CONG_BIC is not set
# CONFIG_TCP_CONG_CUBIC is not set
# CONFIG_TCP_CONG_WESTWOOD is not set
# CONFIG_TCP_CONG_HTCP is not set
# CONFIG_IPV6 is not set
# CONFIG_WIRELESS is not set
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
# CONFIG_PREVENT_FIRMWARE_BUILD is not set
# CONFIG_FW_LOADER is not set
CONFIG_NETDEVICES=y
CONFIG_ETHOC=y
CONFIG_MICREL_PHY=y
# CONFIG_WLAN is not set
# CONFIG_INPUT is not set
# CONFIG_SERIO is not set
# CONFIG_VT is not set
# CONFIG_LEGACY_PTYS is not set
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_OF_PLATFORM=y
# CONFIG_HW_RANDOM is not set
# CONFIG_HWMON is not set
# CONFIG_USB_SUPPORT is not set
# CONFIG_DNOTIFY is not set
CONFIG_TMPFS=y
CONFIG_NFS_FS=y
CONFIG_XZ_DEC=y
# CONFIG_ENABLE_WARN_DEPRECATED is not set
# CONFIG_ENABLE_MUST_CHECK is not set
# CONFIG_RCU_TRACE is not set

5
arch/openrisc/include/asm/Kbuild
View File

@ -1,7 +1,6 @@
generic-y += barrier.h
generic-y += bug.h
generic-y += bugs.h
generic-y += cacheflush.h
generic-y += checksum.h
generic-y += clkdev.h
generic-y += current.h
@ -28,6 +27,10 @@ generic-y += module.h
generic-y += pci.h
generic-y += percpu.h
generic-y += preempt.h
generic-y += qspinlock_types.h
generic-y += qspinlock.h
generic-y += qrwlock_types.h
generic-y += qrwlock.h
generic-y += sections.h
generic-y += segment.h
generic-y += string.h

96
arch/openrisc/include/asm/cacheflush.h Normal file
View File

@ -0,0 +1,96 @@
/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_CACHEFLUSH_H
#define __ASM_CACHEFLUSH_H
#include <linux/mm.h>
/*
* Helper function for flushing or invalidating entire pages from data
* and instruction caches. SMP needs a little extra work, since we need
* to flush the pages on all cpus.
*/
extern void local_dcache_page_flush(struct page *page);
extern void local_icache_page_inv(struct page *page);
/*
* Data cache flushing always happen on the local cpu. Instruction cache
* invalidations need to be broadcasted to all other cpu in the system in
* case of SMP configurations.
*/
#ifndef CONFIG_SMP
#define dcache_page_flush(page) local_dcache_page_flush(page)
#define icache_page_inv(page) local_icache_page_inv(page)
#else /* CONFIG_SMP */
#define dcache_page_flush(page) local_dcache_page_flush(page)
#define icache_page_inv(page) smp_icache_page_inv(page)
extern void smp_icache_page_inv(struct page *page);
#endif /* CONFIG_SMP */
/*
* Synchronizes caches. Whenever a cpu writes executable code to memory, this
* should be called to make sure the processor sees the newly written code.
*/
static inline void sync_icache_dcache(struct page *page)
{
if (!IS_ENABLED(CONFIG_DCACHE_WRITETHROUGH))
dcache_page_flush(page);
icache_page_inv(page);
}
/*
* Pages with this bit set need not be flushed/invalidated, since
* they have not changed since last flush. New pages start with
* PG_arch_1 not set and are therefore dirty by default.
*/
#define PG_dc_clean PG_arch_1
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
static inline void flush_dcache_page(struct page *page)
{
clear_bit(PG_dc_clean, &page->flags);
}
/*
* Other interfaces are not required since we do not have virtually
* indexed or tagged caches. So we can use the default here.
*/
#define flush_cache_all() do { } while (0)
#define flush_cache_mm(mm) do { } while (0)
#define flush_cache_dup_mm(mm) do { } while (0)
#define flush_cache_range(vma, start, end) do { } while (0)
#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
#define flush_dcache_mmap_lock(mapping) do { } while (0)
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
#define flush_icache_range(start, end) do { } while (0)
#define flush_icache_page(vma, pg) do { } while (0)
#define flush_icache_user_range(vma, pg, adr, len) do { } while (0)
#define flush_cache_vmap(start, end) do { } while (0)
#define flush_cache_vunmap(start, end) do { } while (0)
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
do { \
memcpy(dst, src, len); \
if (vma->vm_flags & VM_EXEC) \
sync_icache_dcache(page); \
} while (0)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
#endif /* __ASM_CACHEFLUSH_H */

155
arch/openrisc/include/asm/cmpxchg.h
View File

@ -1,32 +1,29 @@
/*
* 1,2 and 4 byte cmpxchg and xchg implementations for OpenRISC.
*
* Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
* Note:
* The portable implementations of 1 and 2 byte xchg and cmpxchg using a 4
* byte cmpxchg is sourced heavily from the sh and mips implementations.
*/
#ifndef __ASM_OPENRISC_CMPXCHG_H
#define __ASM_OPENRISC_CMPXCHG_H
#include <linux/types.h>
/*
* This function doesn't exist, so you'll get a linker error
* if something tries to do an invalid cmpxchg().
*/
extern void __cmpxchg_called_with_bad_pointer(void);
#include <linux/bitops.h>
#define __HAVE_ARCH_CMPXCHG 1
static inline unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
static inline unsigned long cmpxchg_u32(volatile void *ptr,
unsigned long old, unsigned long new)
{
if (size != 4) {
__cmpxchg_called_with_bad_pointer();
return old;
}
__asm__ __volatile__(
"1: l.lwa %0, 0(%1) \n"
" l.sfeq %0, %2 \n"
@ -43,28 +40,9 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
return old;
}
#define cmpxchg(ptr, o, n) \
({ \
(__typeof__(*(ptr))) __cmpxchg((ptr), \
(unsigned long)(o), \
(unsigned long)(n), \
sizeof(*(ptr))); \
})
/*
* This function doesn't exist, so you'll get a linker error if
* something tries to do an invalidly-sized xchg().
*/
extern void __xchg_called_with_bad_pointer(void);
static inline unsigned long __xchg(unsigned long val, volatile void *ptr,
int size)
static inline unsigned long xchg_u32(volatile void *ptr,
unsigned long val)
{
if (size != 4) {
__xchg_called_with_bad_pointer();
return val;
}
__asm__ __volatile__(
"1: l.lwa %0, 0(%1) \n"
" l.swa 0(%1), %2 \n"
@ -77,10 +55,115 @@ static inline unsigned long __xchg(unsigned long val, volatile void *ptr,
return val;
}
static inline u32 cmpxchg_small(volatile void *ptr, u32 old, u32 new,
int size)
{
int off = (unsigned long)ptr % sizeof(u32);
volatile u32 *p = ptr - off;
#ifdef __BIG_ENDIAN
int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE;
#else
int bitoff = off * BITS_PER_BYTE;
#endif
u32 bitmask = ((0x1 << size * BITS_PER_BYTE) - 1) << bitoff;
u32 load32, old32, new32;
u32 ret;
load32 = READ_ONCE(*p);
while (true) {
ret = (load32 & bitmask) >> bitoff;
if (old != ret)
return ret;
old32 = (load32 & ~bitmask) | (old << bitoff);
new32 = (load32 & ~bitmask) | (new << bitoff);
/* Do 32 bit cmpxchg */
load32 = cmpxchg_u32(p, old32, new32);
if (load32 == old32)
return old;
}
}
/* xchg */
static inline u32 xchg_small(volatile void *ptr, u32 x, int size)
{
int off = (unsigned long)ptr % sizeof(u32);
volatile u32 *p = ptr - off;
#ifdef __BIG_ENDIAN
int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE;
#else
int bitoff = off * BITS_PER_BYTE;
#endif
u32 bitmask = ((0x1 << size * BITS_PER_BYTE) - 1) << bitoff;
u32 oldv, newv;
u32 ret;
do {
oldv = READ_ONCE(*p);
ret = (oldv & bitmask) >> bitoff;
newv = (oldv & ~bitmask) | (x << bitoff);
} while (cmpxchg_u32(p, oldv, newv) != oldv);
return ret;
}
/*
* This function doesn't exist, so you'll get a linker error
* if something tries to do an invalid cmpxchg().
*/
extern unsigned long __cmpxchg_called_with_bad_pointer(void)
__compiletime_error("Bad argument size for cmpxchg");
static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
unsigned long new, int size)
{
switch (size) {
case 1:
case 2:
return cmpxchg_small(ptr, old, new, size);
case 4:
return cmpxchg_u32(ptr, old, new);
default:
return __cmpxchg_called_with_bad_pointer();
}
}
#define cmpxchg(ptr, o, n) \
({ \
(__typeof__(*(ptr))) __cmpxchg((ptr), \
(unsigned long)(o), \
(unsigned long)(n), \
sizeof(*(ptr))); \
})
/*
* This function doesn't exist, so you'll get a linker error if
* something tries to do an invalidly-sized xchg().
*/
extern unsigned long __xchg_called_with_bad_pointer(void)
__compiletime_error("Bad argument size for xchg");
static inline unsigned long __xchg(volatile void *ptr, unsigned long with,
int size)
{
switch (size) {
case 1:
case 2:
return xchg_small(ptr, with, size);
case 4:
return xchg_u32(ptr, with);
default:
return __xchg_called_with_bad_pointer();
}
}
#define xchg(ptr, with) \
({ \
(__typeof__(*(ptr))) __xchg((unsigned long)(with), \
(ptr), \
(__typeof__(*(ptr))) __xchg((ptr), \
(unsigned long)(with), \
sizeof(*(ptr))); \
})

7
arch/openrisc/include/asm/cpuinfo.h
View File

@ -19,7 +19,7 @@
#ifndef __ASM_OPENRISC_CPUINFO_H
#define __ASM_OPENRISC_CPUINFO_H
struct cpuinfo {
struct cpuinfo_or1k {
u32 clock_frequency;
u32 icache_size;
@ -29,8 +29,11 @@ struct cpuinfo {
u32 dcache_size;
u32 dcache_block_size;
u32 dcache_ways;
u16 coreid;
};
extern struct cpuinfo cpuinfo;
extern struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
extern void setup_cpuinfo(void);
#endif /* __ASM_OPENRISC_CPUINFO_H */

2
arch/openrisc/include/asm/mmu_context.h
View File

@ -34,7 +34,7 @@ extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* registers like cr3 on the i386
*/
extern volatile pgd_t *current_pgd; /* defined in arch/openrisc/mm/fault.c */
extern volatile pgd_t *current_pgd[]; /* defined in arch/openrisc/mm/fault.c */
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{

18
arch/openrisc/include/asm/pgtable.h
View File

@ -94,7 +94,7 @@ extern void paging_init(void);
* 64 MB of vmalloc area is comparable to what's available on other arches.
*/
#define VMALLOC_START (PAGE_OFFSET-0x04000000)
#define VMALLOC_START (PAGE_OFFSET-0x04000000UL)
#define VMALLOC_END (PAGE_OFFSET)
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
@ -416,15 +416,19 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* defined in head.S */
struct vm_area_struct;
/*
* or32 doesn't have any external MMU info: the kernel page
* tables contain all the necessary information.
*
* Actually I am not sure on what this could be used for.
*/
static inline void update_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t *pte)
{
}
extern void update_cache(struct vm_area_struct *vma,
unsigned long address, pte_t *pte);
static inline void update_mmu_cache(struct vm_area_struct *vma,
unsigned long address, pte_t *pte)
{
update_tlb(vma, address, pte);
update_cache(vma, address, pte);
}
/* __PHX__ FIXME, SWAP, this probably doesn't work */

2
arch/openrisc/include/asm/serial.h
View File

@ -29,7 +29,7 @@
* it needs to be correct to get the early console working.
*/
#define BASE_BAUD (cpuinfo.clock_frequency/16)
#define BASE_BAUD (cpuinfo_or1k[smp_processor_id()].clock_frequency/16)
#endif /* __KERNEL__ */

26
arch/openrisc/include/asm/smp.h Normal file
View File

@ -0,0 +1,26 @@
/*
* Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#ifndef __ASM_OPENRISC_SMP_H
#define __ASM_OPENRISC_SMP_H
#include <asm/spr.h>
#include <asm/spr_defs.h>
#define raw_smp_processor_id() (current_thread_info()->cpu)
#define hard_smp_processor_id() mfspr(SPR_COREID)
extern void smp_init_cpus(void);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
extern void handle_IPI(unsigned int ipi_msg);
#endif /* __ASM_OPENRISC_SMP_H */

12
arch/openrisc/include/asm/spinlock.h
View File

@ -19,6 +19,16 @@
#ifndef __ASM_OPENRISC_SPINLOCK_H
#define __ASM_OPENRISC_SPINLOCK_H
#error "or32 doesn't do SMP yet"
#include <asm/qspinlock.h>
#include <asm/qrwlock.h>
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif

7
arch/openrisc/include/asm/spinlock_types.h Normal file
View File

@ -0,0 +1,7 @@
#ifndef _ASM_OPENRISC_SPINLOCK_TYPES_H
#define _ASM_OPENRISC_SPINLOCK_TYPES_H
#include <asm/qspinlock_types.h>
#include <asm/qrwlock_types.h>
#endif /* _ASM_OPENRISC_SPINLOCK_TYPES_H */

14
arch/openrisc/include/asm/spr_defs.h
View File

@ -51,6 +51,11 @@
#define SPR_ICCFGR (SPRGROUP_SYS + 6)
#define SPR_DCFGR (SPRGROUP_SYS + 7)
#define SPR_PCCFGR (SPRGROUP_SYS + 8)
#define SPR_VR2 (SPRGROUP_SYS + 9)
#define SPR_AVR (SPRGROUP_SYS + 10)
#define SPR_EVBAR (SPRGROUP_SYS + 11)
#define SPR_AECR (SPRGROUP_SYS + 12)
#define SPR_AESR (SPRGROUP_SYS + 13)
#define SPR_NPC (SPRGROUP_SYS + 16) /* CZ 21/06/01 */
#define SPR_SR (SPRGROUP_SYS + 17) /* CZ 21/06/01 */
#define SPR_PPC (SPRGROUP_SYS + 18) /* CZ 21/06/01 */
@ -61,6 +66,8 @@
#define SPR_EEAR_LAST (SPRGROUP_SYS + 63)
#define SPR_ESR_BASE (SPRGROUP_SYS + 64)
#define SPR_ESR_LAST (SPRGROUP_SYS + 79)
#define SPR_COREID (SPRGROUP_SYS + 128)
#define SPR_NUMCORES (SPRGROUP_SYS + 129)
#define SPR_GPR_BASE (SPRGROUP_SYS + 1024)
/* Data MMU group */
@ -135,11 +142,18 @@
#define SPR_VR_CFG 0x00ff0000 /* Processor configuration */
#define SPR_VR_RES 0x0000ffc0 /* Reserved */
#define SPR_VR_REV 0x0000003f /* Processor revision */
#define SPR_VR_UVRP 0x00000040 /* Updated Version Registers Present */
#define SPR_VR_VER_OFF 24
#define SPR_VR_CFG_OFF 16
#define SPR_VR_REV_OFF 0
/*
* Bit definitions for the Version Register 2
*/
#define SPR_VR2_CPUID 0xff000000 /* Processor ID */
#define SPR_VR2_VER 0x00ffffff /* Processor version */
/*
* Bit definitions for the Unit Present Register
*

2
arch/openrisc/include/asm/thread_info.h
View File

@ -74,7 +74,7 @@ struct thread_info {
.task = &tsk, \
.flags = 0, \
.cpu = 0, \
.preempt_count = 1, \
.preempt_count = INIT_PREEMPT_COUNT, \
.addr_limit = KERNEL_DS, \
.ksp = 0, \
}

23
arch/openrisc/include/asm/time.h Normal file
View File

@ -0,0 +1,23 @@
/*
* OpenRISC timer API
*
* Copyright (C) 2017 by Stafford Horne (shorne@gmail.com)
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef __ASM_OR1K_TIME_H
#define __ASM_OR1K_TIME_H
extern void openrisc_clockevent_init(void);
extern void openrisc_timer_set(unsigned long count);
extern void openrisc_timer_set_next(unsigned long delta);
#ifdef CONFIG_SMP
extern void synchronise_count_master(int cpu);
extern void synchronise_count_slave(int cpu);
#endif
#endif /* __ASM_OR1K_TIME_H */

25
arch/openrisc/include/asm/tlbflush.h
View File

@ -33,13 +33,26 @@
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(mm, start, end) flushes a range of pages
*/
extern void local_flush_tlb_all(void);
extern void local_flush_tlb_mm(struct mm_struct *mm);
extern void local_flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr);
extern void local_flush_tlb_range(struct vm_area_struct *vma,
unsigned long start,
unsigned long end);
void flush_tlb_all(void);
void flush_tlb_mm(struct mm_struct *mm);
void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start,
unsigned long end);
#ifndef CONFIG_SMP
#define flush_tlb_all local_flush_tlb_all
#define flush_tlb_mm local_flush_tlb_mm
#define flush_tlb_page local_flush_tlb_page
#define flush_tlb_range local_flush_tlb_range
#else
extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end);
#endif
static inline void flush_tlb(void)
{

20
arch/openrisc/include/asm/unwinder.h Normal file
View File

@ -0,0 +1,20 @@
/*
* OpenRISC unwinder.h
*
* Architecture API for unwinding stacks.
*
* Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#ifndef __ASM_OPENRISC_UNWINDER_H
#define __ASM_OPENRISC_UNWINDER_H
void unwind_stack(void *data, unsigned long *stack,
void (*trace)(void *data, unsigned long addr,
int reliable));
#endif /* __ASM_OPENRISC_UNWINDER_H */

4
arch/openrisc/kernel/Makefile
View File

@ -7,8 +7,10 @@ extra-y := head.o vmlinux.lds
obj-y := setup.o or32_ksyms.o process.o dma.o \
traps.o time.o irq.o entry.o ptrace.o signal.o \
sys_call_table.o
sys_call_table.o unwinder.o
obj-$(CONFIG_SMP) += smp.o sync-timer.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_OF) += prom.o

14
arch/openrisc/kernel/dma.c
View File

@ -32,6 +32,7 @@ page_set_nocache(pte_t *pte, unsigned long addr,
unsigned long next, struct mm_walk *walk)
{
unsigned long cl;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
pte_val(*pte) |= _PAGE_CI;
@ -42,7 +43,7 @@ page_set_nocache(pte_t *pte, unsigned long addr,
flush_tlb_page(NULL, addr);
/* Flush page out of dcache */
for (cl = __pa(addr); cl < __pa(next); cl += cpuinfo.dcache_block_size)
for (cl = __pa(addr); cl < __pa(next); cl += cpuinfo->dcache_block_size)
mtspr(SPR_DCBFR, cl);
return 0;
@ -140,6 +141,7 @@ or1k_map_page(struct device *dev, struct page *page,
{
unsigned long cl;
dma_addr_t addr = page_to_phys(page) + offset;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
return addr;
@ -148,13 +150,13 @@ or1k_map_page(struct device *dev, struct page *page,
case DMA_TO_DEVICE:
/* Flush the dcache for the requested range */
for (cl = addr; cl < addr + size;
cl += cpuinfo.dcache_block_size)
cl += cpuinfo->dcache_block_size)
mtspr(SPR_DCBFR, cl);
break;
case DMA_FROM_DEVICE:
/* Invalidate the dcache for the requested range */
for (cl = addr; cl < addr + size;
cl += cpuinfo.dcache_block_size)
cl += cpuinfo->dcache_block_size)
mtspr(SPR_DCBIR, cl);
break;
default:
@ -213,9 +215,10 @@ or1k_sync_single_for_cpu(struct device *dev,
{
unsigned long cl;
dma_addr_t addr = dma_handle;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
/* Invalidate the dcache for the requested range */
for (cl = addr; cl < addr + size; cl += cpuinfo.dcache_block_size)
for (cl = addr; cl < addr + size; cl += cpuinfo->dcache_block_size)
mtspr(SPR_DCBIR, cl);
}
@ -226,9 +229,10 @@ or1k_sync_single_for_device(struct device *dev,
{
unsigned long cl;
dma_addr_t addr = dma_handle;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
/* Flush the dcache for the requested range */
for (cl = addr; cl < addr + size; cl += cpuinfo.dcache_block_size)
for (cl = addr; cl < addr + size; cl += cpuinfo->dcache_block_size)
mtspr(SPR_DCBFR, cl);
}

74
arch/openrisc/kernel/entry.S
View File

@ -42,6 +42,61 @@
/* =========================================================[ macros ]=== */
#ifdef CONFIG_TRACE_IRQFLAGS
/*
* Trace irq on/off creating a stack frame.
*/
#define TRACE_IRQS_OP(trace_op) \
l.sw -8(r1),r2 /* store frame pointer */ ;\
l.sw -4(r1),r9 /* store return address */ ;\
l.addi r2,r1,0 /* move sp to fp */ ;\
l.jal trace_op ;\
l.addi r1,r1,-8 ;\
l.ori r1,r2,0 /* restore sp */ ;\
l.lwz r9,-4(r1) /* restore return address */ ;\
l.lwz r2,-8(r1) /* restore fp */ ;\
/*
* Trace irq on/off and save registers we need that would otherwise be
* clobbered.
*/
#define TRACE_IRQS_SAVE(t1,trace_op) \
l.sw -12(r1),t1 /* save extra reg */ ;\
l.sw -8(r1),r2 /* store frame pointer */ ;\
l.sw -4(r1),r9 /* store return address */ ;\
l.addi r2,r1,0 /* move sp to fp */ ;\
l.jal trace_op ;\
l.addi r1,r1,-12 ;\
l.ori r1,r2,0 /* restore sp */ ;\
l.lwz r9,-4(r1) /* restore return address */ ;\
l.lwz r2,-8(r1) /* restore fp */ ;\
l.lwz t1,-12(r1) /* restore extra reg */
#define TRACE_IRQS_OFF TRACE_IRQS_OP(trace_hardirqs_off)
#define TRACE_IRQS_ON TRACE_IRQS_OP(trace_hardirqs_on)
#define TRACE_IRQS_ON_SYSCALL \
TRACE_IRQS_SAVE(r10,trace_hardirqs_on) ;\
l.lwz r3,PT_GPR3(r1) ;\
l.lwz r4,PT_GPR4(r1) ;\
l.lwz r5,PT_GPR5(r1) ;\
l.lwz r6,PT_GPR6(r1) ;\
l.lwz r7,PT_GPR7(r1) ;\
l.lwz r8,PT_GPR8(r1) ;\
l.lwz r11,PT_GPR11(r1)
#define TRACE_IRQS_OFF_ENTRY \
l.lwz r5,PT_SR(r1) ;\
l.andi r3,r5,(SPR_SR_IEE|SPR_SR_TEE) ;\
l.sfeq r5,r0 /* skip trace if irqs were already off */;\
l.bf 1f ;\
l.nop ;\
TRACE_IRQS_SAVE(r4,trace_hardirqs_off) ;\
1:
#else
#define TRACE_IRQS_OFF
#define TRACE_IRQS_ON
#define TRACE_IRQS_OFF_ENTRY
#define TRACE_IRQS_ON_SYSCALL
#endif
/*
* We need to disable interrupts at beginning of RESTORE_ALL
* since interrupt might come in after we've loaded EPC return address
@ -124,6 +179,7 @@ handler: ;\
/* r30 already save */ ;\
/* l.sw PT_GPR30(r1),r30*/ ;\
l.sw PT_GPR31(r1),r31 ;\
TRACE_IRQS_OFF_ENTRY ;\
/* Store -1 in orig_gpr11 for non-syscall exceptions */ ;\
l.addi r30,r0,-1 ;\
l.sw PT_ORIG_GPR11(r1),r30
@ -557,9 +613,6 @@ _string_syscall_return:
.align 4
ENTRY(_sys_call_handler)
/* syscalls run with interrupts enabled */
ENABLE_INTERRUPTS(r29) // enable interrupts, r29 is temp
/* r1, EPCR, ESR a already saved */
l.sw PT_GPR2(r1),r2
/* r3-r8 must be saved because syscall restart relies
@ -597,6 +650,10 @@ ENTRY(_sys_call_handler)
/* l.sw PT_GPR30(r1),r30 */
_syscall_check_trace_enter:
/* syscalls run with interrupts enabled */
TRACE_IRQS_ON_SYSCALL
ENABLE_INTERRUPTS(r29) // enable interrupts, r29 is temp
/* If TIF_SYSCALL_TRACE is set, then we want to do syscall tracing */
l.lwz r30,TI_FLAGS(r10)
l.andi r30,r30,_TIF_SYSCALL_TRACE
@ -657,6 +714,7 @@ _syscall_check_trace_leave:
_syscall_check_work:
/* Here we need to disable interrupts */
DISABLE_INTERRUPTS(r27,r29)
TRACE_IRQS_OFF
l.lwz r30,TI_FLAGS(r10)
l.andi r30,r30,_TIF_WORK_MASK
l.sfne r30,r0
@ -871,6 +929,7 @@ UNHANDLED_EXCEPTION(_vector_0x1f00,0x1f00)
_resume_userspace:
DISABLE_INTERRUPTS(r3,r4)
TRACE_IRQS_OFF
l.lwz r4,TI_FLAGS(r10)
l.andi r13,r4,_TIF_WORK_MASK
l.sfeqi r13,0
@ -909,6 +968,15 @@ _work_pending:
l.lwz r8,PT_GPR8(r1)
_restore_all:
#ifdef CONFIG_TRACE_IRQFLAGS
l.lwz r4,PT_SR(r1)
l.andi r3,r4,(SPR_SR_IEE|SPR_SR_TEE)
l.sfeq r3,r0 /* skip trace if irqs were off */
l.bf skip_hardirqs_on
l.nop
TRACE_IRQS_ON
skip_hardirqs_on:
#endif
RESTORE_ALL
/* This returns to userspace code */

239
arch/openrisc/kernel/head.S
View File

@ -49,9 +49,31 @@
/* ============================================[ tmp store locations ]=== */
#define SPR_SHADOW_GPR(x) ((x) + SPR_GPR_BASE + 32)
/*
* emergency_print temporary stores
*/
#ifdef CONFIG_OPENRISC_HAVE_SHADOW_GPRS
#define EMERGENCY_PRINT_STORE_GPR4 l.mtspr r0,r4,SPR_SHADOW_GPR(14)
#define EMERGENCY_PRINT_LOAD_GPR4 l.mfspr r4,r0,SPR_SHADOW_GPR(14)
#define EMERGENCY_PRINT_STORE_GPR5 l.mtspr r0,r5,SPR_SHADOW_GPR(15)
#define EMERGENCY_PRINT_LOAD_GPR5 l.mfspr r5,r0,SPR_SHADOW_GPR(15)
#define EMERGENCY_PRINT_STORE_GPR6 l.mtspr r0,r6,SPR_SHADOW_GPR(16)
#define EMERGENCY_PRINT_LOAD_GPR6 l.mfspr r6,r0,SPR_SHADOW_GPR(16)
#define EMERGENCY_PRINT_STORE_GPR7 l.mtspr r0,r7,SPR_SHADOW_GPR(7)
#define EMERGENCY_PRINT_LOAD_GPR7 l.mfspr r7,r0,SPR_SHADOW_GPR(7)
#define EMERGENCY_PRINT_STORE_GPR8 l.mtspr r0,r8,SPR_SHADOW_GPR(8)
#define EMERGENCY_PRINT_LOAD_GPR8 l.mfspr r8,r0,SPR_SHADOW_GPR(8)
#define EMERGENCY_PRINT_STORE_GPR9 l.mtspr r0,r9,SPR_SHADOW_GPR(9)
#define EMERGENCY_PRINT_LOAD_GPR9 l.mfspr r9,r0,SPR_SHADOW_GPR(9)
#else /* !CONFIG_OPENRISC_HAVE_SHADOW_GPRS */
#define EMERGENCY_PRINT_STORE_GPR4 l.sw 0x20(r0),r4
#define EMERGENCY_PRINT_LOAD_GPR4 l.lwz r4,0x20(r0)
@ -70,13 +92,28 @@
#define EMERGENCY_PRINT_STORE_GPR9 l.sw 0x34(r0),r9
#define EMERGENCY_PRINT_LOAD_GPR9 l.lwz r9,0x34(r0)
#endif
/*
* TLB miss handlers temorary stores
*/
#define EXCEPTION_STORE_GPR9 l.sw 0x10(r0),r9
#define EXCEPTION_LOAD_GPR9 l.lwz r9,0x10(r0)
#ifdef CONFIG_OPENRISC_HAVE_SHADOW_GPRS
#define EXCEPTION_STORE_GPR2 l.mtspr r0,r2,SPR_SHADOW_GPR(2)
#define EXCEPTION_LOAD_GPR2 l.mfspr r2,r0,SPR_SHADOW_GPR(2)
#define EXCEPTION_STORE_GPR3 l.mtspr r0,r3,SPR_SHADOW_GPR(3)
#define EXCEPTION_LOAD_GPR3 l.mfspr r3,r0,SPR_SHADOW_GPR(3)
#define EXCEPTION_STORE_GPR4 l.mtspr r0,r4,SPR_SHADOW_GPR(4)
#define EXCEPTION_LOAD_GPR4 l.mfspr r4,r0,SPR_SHADOW_GPR(4)
#define EXCEPTION_STORE_GPR5 l.mtspr r0,r5,SPR_SHADOW_GPR(5)
#define EXCEPTION_LOAD_GPR5 l.mfspr r5,r0,SPR_SHADOW_GPR(5)
#define EXCEPTION_STORE_GPR6 l.mtspr r0,r6,SPR_SHADOW_GPR(6)
#define EXCEPTION_LOAD_GPR6 l.mfspr r6,r0,SPR_SHADOW_GPR(6)
#else /* !CONFIG_OPENRISC_HAVE_SHADOW_GPRS */
#define EXCEPTION_STORE_GPR2 l.sw 0x64(r0),r2
#define EXCEPTION_LOAD_GPR2 l.lwz r2,0x64(r0)
@ -92,35 +129,67 @@
#define EXCEPTION_STORE_GPR6 l.sw 0x74(r0),r6
#define EXCEPTION_LOAD_GPR6 l.lwz r6,0x74(r0)
#endif
/*
* EXCEPTION_HANDLE temporary stores
*/
#ifdef CONFIG_OPENRISC_HAVE_SHADOW_GPRS
#define EXCEPTION_T_STORE_GPR30 l.mtspr r0,r30,SPR_SHADOW_GPR(30)
#define EXCEPTION_T_LOAD_GPR30(reg) l.mfspr reg,r0,SPR_SHADOW_GPR(30)
#define EXCEPTION_T_STORE_GPR10 l.mtspr r0,r10,SPR_SHADOW_GPR(10)
#define EXCEPTION_T_LOAD_GPR10(reg) l.mfspr reg,r0,SPR_SHADOW_GPR(10)
#define EXCEPTION_T_STORE_SP l.mtspr r0,r1,SPR_SHADOW_GPR(1)
#define EXCEPTION_T_LOAD_SP(reg) l.mfspr reg,r0,SPR_SHADOW_GPR(1)
#else /* !CONFIG_OPENRISC_HAVE_SHADOW_GPRS */
#define EXCEPTION_T_STORE_GPR30 l.sw 0x78(r0),r30
#define EXCEPTION_T_LOAD_GPR30(reg) l.lwz reg,0x78(r0)
#define EXCEPTION_T_STORE_GPR10 l.sw 0x7c(r0),r10
#define EXCEPTION_T_LOAD_GPR10(reg) l.lwz reg,0x7c(r0)
#define EXCEPTION_T_STORE_SP l.sw 0x80(r0),r1
#define EXCEPTION_T_STORE_SP l.sw 0x80(r0),r1
#define EXCEPTION_T_LOAD_SP(reg) l.lwz reg,0x80(r0)
/*
* For UNHANLDED_EXCEPTION
*/
#define EXCEPTION_T_STORE_GPR31 l.sw 0x84(r0),r31
#define EXCEPTION_T_LOAD_GPR31(reg) l.lwz reg,0x84(r0)
#endif
/* =========================================================[ macros ]=== */
#ifdef CONFIG_SMP
#define GET_CURRENT_PGD(reg,t1) \
LOAD_SYMBOL_2_GPR(reg,current_pgd) ;\
l.mfspr t1,r0,SPR_COREID ;\
l.slli t1,t1,2 ;\
l.add reg,reg,t1 ;\
tophys (t1,reg) ;\
l.lwz reg,0(t1)
#else
#define GET_CURRENT_PGD(reg,t1) \
LOAD_SYMBOL_2_GPR(reg,current_pgd) ;\
tophys (t1,reg) ;\
l.lwz reg,0(t1)
#endif
/* Load r10 from current_thread_info_set - clobbers r1 and r30 */
#ifdef CONFIG_SMP
#define GET_CURRENT_THREAD_INFO \
LOAD_SYMBOL_2_GPR(r1,current_thread_info_set) ;\
tophys (r30,r1) ;\
l.mfspr r10,r0,SPR_COREID ;\
l.slli r10,r10,2 ;\
l.add r30,r30,r10 ;\
/* r10: current_thread_info */ ;\
l.lwz r10,0(r30)
#else
#define GET_CURRENT_THREAD_INFO \
LOAD_SYMBOL_2_GPR(r1,current_thread_info_set) ;\
tophys (r30,r1) ;\
/* r10: current_thread_info */ ;\
l.lwz r10,0(r30)
#endif
/*
* DSCR: this is a common hook for handling exceptions. it will save
@ -163,10 +232,7 @@
l.bnf 2f /* kernel_mode */ ;\
EXCEPTION_T_STORE_SP /* delay slot */ ;\
1: /* user_mode: */ ;\
LOAD_SYMBOL_2_GPR(r1,current_thread_info_set) ;\
tophys (r30,r1) ;\
/* r10: current_thread_info */ ;\
l.lwz r10,0(r30) ;\
GET_CURRENT_THREAD_INFO ;\
tophys (r30,r10) ;\
l.lwz r1,(TI_KSP)(r30) ;\
/* fall through */ ;\
@ -226,7 +292,7 @@
*
*/
#define UNHANDLED_EXCEPTION(handler) \
EXCEPTION_T_STORE_GPR31 ;\
EXCEPTION_T_STORE_GPR30 ;\
EXCEPTION_T_STORE_GPR10 ;\
EXCEPTION_T_STORE_SP ;\
/* temporary store r3, r9 into r1, r10 */ ;\
@ -255,35 +321,35 @@
/* r1: KSP, r10: current, r31: __pa(KSP) */ ;\
/* r12: temp, syscall indicator, r13 temp */ ;\
l.addi r1,r1,-(INT_FRAME_SIZE) ;\
/* r1 is KSP, r31 is __pa(KSP) */ ;\
tophys (r31,r1) ;\
l.sw PT_GPR12(r31),r12 ;\
/* r1 is KSP, r30 is __pa(KSP) */ ;\
tophys (r30,r1) ;\
l.sw PT_GPR12(r30),r12 ;\
l.mfspr r12,r0,SPR_EPCR_BASE ;\
l.sw PT_PC(r31),r12 ;\
l.sw PT_PC(r30),r12 ;\
l.mfspr r12,r0,SPR_ESR_BASE ;\
l.sw PT_SR(r31),r12 ;\
l.sw PT_SR(r30),r12 ;\
/* save r31 */ ;\
EXCEPTION_T_LOAD_GPR31(r12) ;\
l.sw PT_GPR31(r31),r12 ;\
EXCEPTION_T_LOAD_GPR30(r12) ;\
l.sw PT_GPR30(r30),r12 ;\
/* save r10 as was prior to exception */ ;\
EXCEPTION_T_LOAD_GPR10(r12) ;\
l.sw PT_GPR10(r31),r12 ;\
l.sw PT_GPR10(r30),r12 ;\
/* save PT_SP as was prior to exception */ ;\
EXCEPTION_T_LOAD_SP(r12) ;\
l.sw PT_SP(r31),r12 ;\
l.sw PT_GPR13(r31),r13 ;\
l.sw PT_SP(r30),r12 ;\
l.sw PT_GPR13(r30),r13 ;\
/* --> */ ;\
/* save exception r4, set r4 = EA */ ;\
l.sw PT_GPR4(r31),r4 ;\
l.sw PT_GPR4(r30),r4 ;\
l.mfspr r4,r0,SPR_EEAR_BASE ;\
/* r12 == 1 if we come from syscall */ ;\
CLEAR_GPR(r12) ;\
/* ----- play a MMU trick ----- */ ;\
l.ori r31,r0,(EXCEPTION_SR) ;\
l.mtspr r0,r31,SPR_ESR_BASE ;\
l.ori r30,r0,(EXCEPTION_SR) ;\
l.mtspr r0,r30,SPR_ESR_BASE ;\
/* r31: EA address of handler */ ;\
LOAD_SYMBOL_2_GPR(r31,handler) ;\
l.mtspr r0,r31,SPR_EPCR_BASE ;\
LOAD_SYMBOL_2_GPR(r30,handler) ;\
l.mtspr r0,r30,SPR_EPCR_BASE ;\
l.rfe
/* =====================================================[ exceptions] === */
@ -487,6 +553,12 @@ _start:
CLEAR_GPR(r30)
CLEAR_GPR(r31)
#ifdef CONFIG_SMP
l.mfspr r26,r0,SPR_COREID
l.sfeq r26,r0
l.bnf secondary_wait
l.nop
#endif
/*
* set up initial ksp and current
*/
@ -638,6 +710,100 @@ _flush_tlb:
l.jr r9
l.nop
#ifdef CONFIG_SMP
secondary_wait:
/* Doze the cpu until we are asked to run */
/* If we dont have power management skip doze */
l.mfspr r25,r0,SPR_UPR
l.andi r25,r25,SPR_UPR_PMP
l.sfeq r25,r0
l.bf secondary_check_release
l.nop
/* Setup special secondary exception handler */
LOAD_SYMBOL_2_GPR(r3, _secondary_evbar)
tophys(r25,r3)
l.mtspr r0,r25,SPR_EVBAR
/* Enable Interrupts */
l.mfspr r25,r0,SPR_SR
l.ori r25,r25,SPR_SR_IEE
l.mtspr r0,r25,SPR_SR
/* Unmask interrupts interrupts */
l.mfspr r25,r0,SPR_PICMR
l.ori r25,r25,0xffff
l.mtspr r0,r25,SPR_PICMR
/* Doze */
l.mfspr r25,r0,SPR_PMR
LOAD_SYMBOL_2_GPR(r3, SPR_PMR_DME)
l.or r25,r25,r3
l.mtspr r0,r25,SPR_PMR
/* Wakeup - Restore exception handler */
l.mtspr r0,r0,SPR_EVBAR
secondary_check_release:
/*
* Check if we actually got the release signal, if not go-back to
* sleep.
*/
l.mfspr r25,r0,SPR_COREID
LOAD_SYMBOL_2_GPR(r3, secondary_release)
tophys(r4, r3)
l.lwz r3,0(r4)
l.sfeq r25,r3
l.bnf secondary_wait
l.nop
/* fall through to secondary_init */
secondary_init:
/*
* set up initial ksp and current
*/
LOAD_SYMBOL_2_GPR(r10, secondary_thread_info)
tophys (r30,r10)
l.lwz r10,0(r30)
l.addi r1,r10,THREAD_SIZE
tophys (r30,r10)
l.sw TI_KSP(r30),r1
l.jal _ic_enable
l.nop
l.jal _dc_enable
l.nop
l.jal _flush_tlb
l.nop
/*
* enable dmmu & immu
*/
l.mfspr r30,r0,SPR_SR
l.movhi r28,hi(SPR_SR_DME | SPR_SR_IME)
l.ori r28,r28,lo(SPR_SR_DME | SPR_SR_IME)
l.or r30,r30,r28
/*
* This is a bit tricky, we need to switch over from physical addresses
* to virtual addresses on the fly.
* To do that, we first set up ESR with the IME and DME bits set.
* Then EPCR is set to secondary_start and then a l.rfe is issued to
* "jump" to that.
*/
l.mtspr r0,r30,SPR_ESR_BASE
LOAD_SYMBOL_2_GPR(r30, secondary_start)
l.mtspr r0,r30,SPR_EPCR_BASE
l.rfe
secondary_start:
LOAD_SYMBOL_2_GPR(r30, secondary_start_kernel)
l.jr r30
l.nop
#endif
/* ========================================[ cache ]=== */
/* alignment here so we don't change memory offsets with
@ -1533,6 +1699,17 @@ ENTRY(_early_uart_init)
l.jr r9
l.nop
.align 0x1000
.global _secondary_evbar
_secondary_evbar:
.space 0x800
/* Just disable interrupts and Return */
l.ori r3,r0,SPR_SR_SM
l.mtspr r0,r3,SPR_ESR_BASE
l.rfe
.section .rodata
_string_unhandled_exception:
.string "\n\rRunarunaround: Unhandled exception 0x\0"

163
arch/openrisc/kernel/setup.c
View File

@ -93,7 +93,7 @@ static void __init setup_memory(void)
memblock_dump_all();
}
struct cpuinfo cpuinfo;
struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
static void print_cpuinfo(void)
{
@ -101,12 +101,13 @@ static void print_cpuinfo(void)
unsigned long vr = mfspr(SPR_VR);
unsigned int version;
unsigned int revision;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
version = (vr & SPR_VR_VER) >> 24;
revision = (vr & SPR_VR_REV);
printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
version, revision, cpuinfo.clock_frequency / 1000000);
version, revision, cpuinfo->clock_frequency / 1000000);
if (!(upr & SPR_UPR_UP)) {
printk(KERN_INFO
@ -117,15 +118,15 @@ static void print_cpuinfo(void)
if (upr & SPR_UPR_DCP)
printk(KERN_INFO
"-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
cpuinfo.dcache_size, cpuinfo.dcache_block_size,
cpuinfo.dcache_ways);
cpuinfo->dcache_size, cpuinfo->dcache_block_size,
cpuinfo->dcache_ways);
else
printk(KERN_INFO "-- dcache disabled\n");
if (upr & SPR_UPR_ICP)
printk(KERN_INFO
"-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
cpuinfo.icache_size, cpuinfo.icache_block_size,
cpuinfo.icache_ways);
cpuinfo->icache_size, cpuinfo->icache_block_size,
cpuinfo->icache_ways);
else
printk(KERN_INFO "-- icache disabled\n");
@ -153,38 +154,58 @@ static void print_cpuinfo(void)
printk(KERN_INFO "-- custom unit(s)\n");
}
static struct device_node *setup_find_cpu_node(int cpu)
{
u32 hwid;
struct device_node *cpun;
struct device_node *cpus = of_find_node_by_path("/cpus");
for_each_available_child_of_node(cpus, cpun) {
if (of_property_read_u32(cpun, "reg", &hwid))
continue;
if (hwid == cpu)
return cpun;
}
return NULL;
}
void __init setup_cpuinfo(void)
{
struct device_node *cpu;
unsigned long iccfgr, dccfgr;
unsigned long cache_set_size;
int cpu_id = smp_processor_id();
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id];
cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
cpu = setup_find_cpu_node(cpu_id);
if (!cpu)
panic("No compatible CPU found in device tree...\n");
panic("Couldn't find CPU%d in device tree...\n", cpu_id);
iccfgr = mfspr(SPR_ICCFGR);
cpuinfo.icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
cpuinfo.icache_size =
cache_set_size * cpuinfo.icache_ways * cpuinfo.icache_block_size;
cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
cpuinfo->icache_size =
cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size;
dccfgr = mfspr(SPR_DCCFGR);
cpuinfo.dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
cpuinfo.dcache_size =
cache_set_size * cpuinfo.dcache_ways * cpuinfo.dcache_block_size;
cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
cpuinfo->dcache_size =
cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size;
if (of_property_read_u32(cpu, "clock-frequency",
&cpuinfo.clock_frequency)) {
&cpuinfo->clock_frequency)) {
printk(KERN_WARNING
"Device tree missing CPU 'clock-frequency' parameter."
"Assuming frequency 25MHZ"
"This is probably not what you want.");
}
cpuinfo->coreid = mfspr(SPR_COREID);
of_node_put(cpu);
print_cpuinfo();
@ -251,8 +272,8 @@ void __init detect_unit_config(unsigned long upr, unsigned long mask,
void calibrate_delay(void)
{
const int *val;
struct device_node *cpu = NULL;
cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
struct device_node *cpu = setup_find_cpu_node(smp_processor_id());
val = of_get_property(cpu, "clock-frequency", NULL);
if (!val)
panic("no cpu 'clock-frequency' parameter in device tree");
@ -268,6 +289,10 @@ void __init setup_arch(char **cmdline_p)
setup_cpuinfo();
#ifdef CONFIG_SMP
smp_init_cpus();
#endif
/* process 1's initial memory region is the kernel code/data */
init_mm.start_code = (unsigned long)_stext;
init_mm.end_code = (unsigned long)_etext;
@ -302,54 +327,78 @@ void __init setup_arch(char **cmdline_p)
static int show_cpuinfo(struct seq_file *m, void *v)
{
unsigned long vr;
int version, revision;
unsigned int vr, cpucfgr;
unsigned int avr;
unsigned int version;
struct cpuinfo_or1k *cpuinfo = v;
vr = mfspr(SPR_VR);
version = (vr & SPR_VR_VER) >> 24;
revision = vr & SPR_VR_REV;
cpucfgr = mfspr(SPR_CPUCFGR);
#ifdef CONFIG_SMP
seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid);
#endif
if (vr & SPR_VR_UVRP) {
vr = mfspr(SPR_VR2);
version = vr & SPR_VR2_VER;
avr = mfspr(SPR_AVR);
seq_printf(m, "cpu architecture\t: "
"OpenRISC 1000 (%d.%d-rev%d)\n",
(avr >> 24) & 0xff,
(avr >> 16) & 0xff,
(avr >> 8) & 0xff);
seq_printf(m, "cpu implementation id\t: 0x%x\n",
(vr & SPR_VR2_CPUID) >> 24);
seq_printf(m, "cpu version\t\t: 0x%x\n", version);
} else {
version = (vr & SPR_VR_VER) >> 24;
seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version);
seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV);
}
seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size);
seq_printf(m, "dcache block size\t: %d bytes\n",
cpuinfo->dcache_block_size);
seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways);
seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size);
seq_printf(m, "icache block size\t: %d bytes\n",
cpuinfo->icache_block_size);
seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways);
seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
seq_printf(m, "bogomips\t\t: %lu.%02lu\n",
(loops_per_jiffy * HZ) / 500000,
((loops_per_jiffy * HZ) / 5000) % 100);
seq_puts(m, "features\t\t: ");
seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
seq_puts(m, "\n");
seq_puts(m, "\n");
seq_printf(m,
"cpu\t\t: OpenRISC-%x\n"
"revision\t: %d\n"
"frequency\t: %ld\n"
"dcache size\t: %d bytes\n"
"dcache block size\t: %d bytes\n"
"dcache ways\t: %d\n"
"icache size\t: %d bytes\n"
"icache block size\t: %d bytes\n"
"icache ways\t: %d\n"
"immu\t\t: %d entries, %lu ways\n"
"dmmu\t\t: %d entries, %lu ways\n"
"bogomips\t: %lu.%02lu\n",
version,
revision,
loops_per_jiffy * HZ,
cpuinfo.dcache_size,
cpuinfo.dcache_block_size,
cpuinfo.dcache_ways,
cpuinfo.icache_size,
cpuinfo.icache_block_size,
cpuinfo.icache_ways,
1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW),
1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW),
(loops_per_jiffy * HZ) / 500000,
((loops_per_jiffy * HZ) / 5000) % 100);
return 0;
}
static void *c_start(struct seq_file *m, loff_t * pos)
static void *c_start(struct seq_file *m, loff_t *pos)
{
/* We only have one CPU... */
return *pos < 1 ? (void *)1 : NULL;
*pos = cpumask_next(*pos - 1, cpu_online_mask);
if ((*pos) < nr_cpu_ids)
return &cpuinfo_or1k[*pos];
return NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t * pos)
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return NULL;
(*pos)++;
return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)

259
arch/openrisc/kernel/smp.c Normal file
View File

@ -0,0 +1,259 @@
/*
* Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
*
* Based on arm64 and arc implementations
* Copyright (C) 2013 ARM Ltd.
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include <asm/cpuinfo.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include <asm/time.h>
static void (*smp_cross_call)(const struct cpumask *, unsigned int);
unsigned long secondary_release = -1;
struct thread_info *secondary_thread_info;
enum ipi_msg_type {
IPI_WAKEUP,
IPI_RESCHEDULE,
IPI_CALL_FUNC,
IPI_CALL_FUNC_SINGLE,
};
static DEFINE_SPINLOCK(boot_lock);
static void boot_secondary(unsigned int cpu, struct task_struct *idle)
{
/*
* set synchronisation state between this boot processor
* and the secondary one
*/
spin_lock(&boot_lock);
secondary_release = cpu;
smp_cross_call(cpumask_of(cpu), IPI_WAKEUP);
/*
* now the secondary core is starting up let it run its
* calibrations, then wait for it to finish
*/
spin_unlock(&boot_lock);
}
void __init smp_prepare_boot_cpu(void)
{
}
void __init smp_init_cpus(void)
{
int i;
for (i = 0; i < NR_CPUS; i++)
set_cpu_possible(i, true);
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
int i;
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
}
void __init smp_cpus_done(unsigned int max_cpus)
{
}
static DECLARE_COMPLETION(cpu_running);
int __cpu_up(unsigned int cpu, struct task_struct *idle)
{
if (smp_cross_call == NULL) {
pr_warn("CPU%u: failed to start, IPI controller missing",
cpu);
return -EIO;
}
secondary_thread_info = task_thread_info(idle);
current_pgd[cpu] = init_mm.pgd;
boot_secondary(cpu, idle);
if (!wait_for_completion_timeout(&cpu_running,
msecs_to_jiffies(1000))) {
pr_crit("CPU%u: failed to start\n", cpu);
return -EIO;
}
synchronise_count_master(cpu);
return 0;
}
asmlinkage __init void secondary_start_kernel(void)
{
struct mm_struct *mm = &init_mm;
unsigned int cpu = smp_processor_id();
/*
* All kernel threads share the same mm context; grab a
* reference and switch to it.
*/
atomic_inc(&mm->mm_count);
current->active_mm = mm;
cpumask_set_cpu(cpu, mm_cpumask(mm));
pr_info("CPU%u: Booted secondary processor\n", cpu);
setup_cpuinfo();
openrisc_clockevent_init();
notify_cpu_starting(cpu);
/*
* OK, now it's safe to let the boot CPU continue
*/
complete(&cpu_running);
synchronise_count_slave(cpu);
set_cpu_online(cpu, true);
local_irq_enable();
preempt_disable();
/*
* OK, it's off to the idle thread for us
*/
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
void handle_IPI(unsigned int ipi_msg)
{
unsigned int cpu = smp_processor_id();
switch (ipi_msg) {
case IPI_WAKEUP:
break;
case IPI_RESCHEDULE:
scheduler_ipi();
break;
case IPI_CALL_FUNC:
generic_smp_call_function_interrupt();
break;
case IPI_CALL_FUNC_SINGLE:
generic_smp_call_function_single_interrupt();
break;
default:
WARN(1, "CPU%u: Unknown IPI message 0x%x\n", cpu, ipi_msg);
break;
}
}
void smp_send_reschedule(int cpu)
{
smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
}
static void stop_this_cpu(void *dummy)
{
/* Remove this CPU */
set_cpu_online(smp_processor_id(), false);
local_irq_disable();
/* CPU Doze */
if (mfspr(SPR_UPR) & SPR_UPR_PMP)
mtspr(SPR_PMR, mfspr(SPR_PMR) | SPR_PMR_DME);
/* If that didn't work, infinite loop */
while (1)
;
}
void smp_send_stop(void)
{
smp_call_function(stop_this_cpu, NULL, 0);
}
/* not supported, yet */
int setup_profiling_timer(unsigned int multiplier)
{
return -EINVAL;
}
void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
{
smp_cross_call = fn;
}
void arch_send_call_function_single_ipi(int cpu)
{
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_CALL_FUNC);
}
/* TLB flush operations - Performed on each CPU*/
static inline void ipi_flush_tlb_all(void *ignored)
{
local_flush_tlb_all();
}
void flush_tlb_all(void)
{
on_each_cpu(ipi_flush_tlb_all, NULL, 1);
}
/*
* FIXME: implement proper functionality instead of flush_tlb_all.
* *But*, as things currently stands, the local_tlb_flush_* functions will
* all boil down to local_tlb_flush_all anyway.
*/
void flush_tlb_mm(struct mm_struct *mm)
{
on_each_cpu(ipi_flush_tlb_all, NULL, 1);
}
void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
on_each_cpu(ipi_flush_tlb_all, NULL, 1);
}
void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
on_each_cpu(ipi_flush_tlb_all, NULL, 1);
}
/* Instruction cache invalidate - performed on each cpu */
static void ipi_icache_page_inv(void *arg)
{
struct page *page = arg;
local_icache_page_inv(page);
}
void smp_icache_page_inv(struct page *page)
{
on_each_cpu(ipi_icache_page_inv, page, 1);
}
EXPORT_SYMBOL(smp_icache_page_inv);

86
arch/openrisc/kernel/stacktrace.c Normal file
View File

@ -0,0 +1,86 @@
/*
* Stack trace utility for OpenRISC
*
* Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
* Losely based on work from sh and powerpc.
*/
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/stacktrace.h>
#include <asm/processor.h>
#include <asm/unwinder.h>
/*
* Save stack-backtrace addresses into a stack_trace buffer.
*/
static void
save_stack_address(void *data, unsigned long addr, int reliable)
{
struct stack_trace *trace = data;
if (!reliable)
return;
if (trace->skip > 0) {
trace->skip--;
return;
}
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = addr;
}
void save_stack_trace(struct stack_trace *trace)
{
unwind_stack(trace, (unsigned long *) &trace, save_stack_address);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
static void
save_stack_address_nosched(void *data, unsigned long addr, int reliable)
{
struct stack_trace *trace = (struct stack_trace *)data;
if (!reliable)
return;
if (in_sched_functions(addr))
return;
if (trace->skip > 0) {
trace->skip--;
return;
}
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = addr;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
unsigned long *sp = NULL;
if (tsk == current)
sp = (unsigned long *) &sp;
else
sp = (unsigned long *) KSTK_ESP(tsk);
unwind_stack(trace, sp, save_stack_address_nosched);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
void
save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
{
unwind_stack(trace, (unsigned long *) regs->sp,
save_stack_address_nosched);
}
EXPORT_SYMBOL_GPL(save_stack_trace_regs);

120
arch/openrisc/kernel/sync-timer.c Normal file
View File

@ -0,0 +1,120 @@
/*
* OR1K timer synchronisation
*
* Based on work from MIPS implementation.
*
* All CPUs will have their count registers synchronised to the CPU0 next time
* value. This can cause a small timewarp for CPU0. All other CPU's should
* not have done anything significant (but they may have had interrupts
* enabled briefly - prom_smp_finish() should not be responsible for enabling
* interrupts...)
*/
#include <linux/kernel.h>
#include <linux/irqflags.h>
#include <linux/cpumask.h>
#include <asm/time.h>
#include <asm/timex.h>
#include <linux/atomic.h>
#include <asm/barrier.h>
#include <asm/spr.h>
static unsigned int initcount;
static atomic_t count_count_start = ATOMIC_INIT(0);
static atomic_t count_count_stop = ATOMIC_INIT(0);
#define COUNTON 100
#define NR_LOOPS 3
void synchronise_count_master(int cpu)
{
int i;
unsigned long flags;
pr_info("Synchronize counters for CPU %u: ", cpu);
local_irq_save(flags);
/*
* We loop a few times to get a primed instruction cache,
* then the last pass is more or less synchronised and
* the master and slaves each set their cycle counters to a known
* value all at once. This reduces the chance of having random offsets
* between the processors, and guarantees that the maximum
* delay between the cycle counters is never bigger than
* the latency of information-passing (cachelines) between
* two CPUs.
*/
for (i = 0; i < NR_LOOPS; i++) {
/* slaves loop on '!= 2' */
while (atomic_read(&count_count_start) != 1)
mb();
atomic_set(&count_count_stop, 0);
smp_wmb();
/* Let the slave writes its count register */
atomic_inc(&count_count_start);
/* Count will be initialised to current timer */
if (i == 1)
initcount = get_cycles();
/*
* Everyone initialises count in the last loop:
*/
if (i == NR_LOOPS-1)
openrisc_timer_set(initcount);
/*
* Wait for slave to leave the synchronization point:
*/
while (atomic_read(&count_count_stop) != 1)
mb();
atomic_set(&count_count_start, 0);
smp_wmb();
atomic_inc(&count_count_stop);
}
/* Arrange for an interrupt in a short while */
openrisc_timer_set_next(COUNTON);
local_irq_restore(flags);
/*
* i386 code reported the skew here, but the
* count registers were almost certainly out of sync
* so no point in alarming people
*/
pr_cont("done.\n");
}
void synchronise_count_slave(int cpu)
{
int i;
/*
* Not every cpu is online at the time this gets called,
* so we first wait for the master to say everyone is ready
*/
for (i = 0; i < NR_LOOPS; i++) {
atomic_inc(&count_count_start);
while (atomic_read(&count_count_start) != 2)
mb();
/*
* Everyone initialises count in the last loop:
*/
if (i == NR_LOOPS-1)
openrisc_timer_set(initcount);
atomic_inc(&count_count_stop);
while (atomic_read(&count_count_stop) != 2)
mb();
}
/* Arrange for an interrupt in a short while */
openrisc_timer_set_next(COUNTON);
}
#undef NR_LOOPS

66
arch/openrisc/kernel/time.c
View File

@ -27,8 +27,14 @@
#include <asm/cpuinfo.h>
static int openrisc_timer_set_next_event(unsigned long delta,
struct clock_event_device *dev)
/* Test the timer ticks to count, used in sync routine */
inline void openrisc_timer_set(unsigned long count)
{
mtspr(SPR_TTCR, count);
}
/* Set the timer to trigger in delta cycles */
inline void openrisc_timer_set_next(unsigned long delta)
{
u32 c;
@ -44,7 +50,12 @@ static int openrisc_timer_set_next_event(unsigned long delta,
* Keep timer in continuous mode always.
*/
mtspr(SPR_TTMR, SPR_TTMR_CR | SPR_TTMR_IE | c);
}
static int openrisc_timer_set_next_event(unsigned long delta,
struct clock_event_device *dev)
{
openrisc_timer_set_next(delta);
return 0;
}
@ -53,13 +64,32 @@ static int openrisc_timer_set_next_event(unsigned long delta,
* timers) we cannot enable the PERIODIC feature. The tick timer can run using
* one-shot events, so no problem.
*/
DEFINE_PER_CPU(struct clock_event_device, clockevent_openrisc_timer);
static struct clock_event_device clockevent_openrisc_timer = {
.name = "openrisc_timer_clockevent",
.features = CLOCK_EVT_FEAT_ONESHOT,
.rating = 300,
.set_next_event = openrisc_timer_set_next_event,
};
void openrisc_clockevent_init(void)
{
unsigned int cpu = smp_processor_id();
struct clock_event_device *evt =
&per_cpu(clockevent_openrisc_timer, cpu);
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu];
mtspr(SPR_TTMR, SPR_TTMR_CR);
#ifdef CONFIG_SMP
evt->broadcast = tick_broadcast;
#endif
evt->name = "openrisc_timer_clockevent",
evt->features = CLOCK_EVT_FEAT_ONESHOT,
evt->rating = 300,
evt->set_next_event = openrisc_timer_set_next_event,
evt->cpumask = cpumask_of(cpu);
/* We only have 28 bits */
clockevents_config_and_register(evt, cpuinfo->clock_frequency,
100, 0x0fffffff);
}
static inline void timer_ack(void)
{
@ -83,7 +113,9 @@ static inline void timer_ack(void)
irqreturn_t __irq_entry timer_interrupt(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
struct clock_event_device *evt = &clockevent_openrisc_timer;
unsigned int cpu = smp_processor_id();
struct clock_event_device *evt =
&per_cpu(clockevent_openrisc_timer, cpu);
timer_ack();
@ -99,24 +131,12 @@ irqreturn_t __irq_entry timer_interrupt(struct pt_regs *regs)
return IRQ_HANDLED;
}
static __init void openrisc_clockevent_init(void)
{
clockevent_openrisc_timer.cpumask = cpumask_of(0);
/* We only have 28 bits */
clockevents_config_and_register(&clockevent_openrisc_timer,
cpuinfo.clock_frequency,
100, 0x0fffffff);
}
/**
* Clocksource: Based on OpenRISC timer/counter
*
* This sets up the OpenRISC Tick Timer as a clock source. The tick timer
* is 32 bits wide and runs at the CPU clock frequency.
*/
static u64 openrisc_timer_read(struct clocksource *cs)
{
return (u64) mfspr(SPR_TTCR);
@ -132,7 +152,9 @@ static struct clocksource openrisc_timer = {
static int __init openrisc_timer_init(void)
{
if (clocksource_register_hz(&openrisc_timer, cpuinfo.clock_frequency))
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
if (clocksource_register_hz(&openrisc_timer, cpuinfo->clock_frequency))
panic("failed to register clocksource");
/* Enable the incrementer: 'continuous' mode with interrupt disabled */

54
arch/openrisc/kernel/traps.c
View File

@ -38,6 +38,7 @@
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/unwinder.h>
extern char _etext, _stext;
@ -45,61 +46,20 @@ int kstack_depth_to_print = 0x180;
int lwa_flag;
unsigned long __user *lwa_addr;
static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
void print_trace(void *data, unsigned long addr, int reliable)
{
return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
}
void show_trace(struct task_struct *task, unsigned long *stack)
{
struct thread_info *context;
unsigned long addr;
context = (struct thread_info *)
((unsigned long)stack & (~(THREAD_SIZE - 1)));
while (valid_stack_ptr(context, stack)) {
addr = *stack++;
if (__kernel_text_address(addr)) {
printk(" [<%08lx>]", addr);
print_symbol(" %s", addr);
printk("\n");
}
}
printk(" =======================\n");
pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
(void *) addr);
}
/* displays a short stack trace */
void show_stack(struct task_struct *task, unsigned long *esp)
{
unsigned long addr, *stack;
int i;
if (esp == NULL)
esp = (unsigned long *)&esp;
stack = esp;
printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
for (i = 0; i < kstack_depth_to_print; i++) {
if (kstack_end(stack))
break;
if (__get_user(addr, stack)) {
/* This message matches "failing address" marked
s390 in ksymoops, so lines containing it will
not be filtered out by ksymoops. */
printk("Failing address 0x%lx\n", (unsigned long)stack);
break;
}
stack++;
printk("sp + %02d: 0x%08lx\n", i * 4, addr);
}
printk("\n");
show_trace(task, esp);
return;
pr_emerg("Call trace:\n");
unwind_stack(NULL, esp, print_trace);
}
void show_trace_task(struct task_struct *tsk)
@ -115,7 +75,7 @@ void show_registers(struct pt_regs *regs)
int in_kernel = 1;
unsigned long esp;
esp = (unsigned long)(&regs->sp);
esp = (unsigned long)(regs->sp);
if (user_mode(regs))
in_kernel = 0;

105
arch/openrisc/kernel/unwinder.c Normal file
View File

@ -0,0 +1,105 @@
/*
* OpenRISC unwinder.c
*
* Reusable arch specific api for unwinding stacks.
*
* Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/sched/task_stack.h>
#include <linux/kernel.h>
#include <asm/unwinder.h>
#ifdef CONFIG_FRAME_POINTER
struct or1k_frameinfo {
unsigned long *fp;
unsigned long ra;
unsigned long top;
};
/*
* Verify a frameinfo structure. The return address should be a valid text
* address. The frame pointer may be null if its the last frame, otherwise
* the frame pointer should point to a location in the stack after the the
* top of the next frame up.
*/
static inline int or1k_frameinfo_valid(struct or1k_frameinfo *frameinfo)
{
return (frameinfo->fp == NULL ||
(!kstack_end(frameinfo->fp) &&
frameinfo->fp > &frameinfo->top)) &&
__kernel_text_address(frameinfo->ra);
}
/*
* Create a stack trace doing scanning which is frame pointer aware. We can
* get reliable stack traces by matching the previously found frame
* pointer with the top of the stack address every time we find a valid
* or1k_frameinfo.
*
* Ideally the stack parameter will be passed as FP, but it can not be
* guaranteed. Therefore we scan each address looking for the first sign
* of a return address.
*
* The OpenRISC stack frame looks something like the following. The
* location SP is held in r1 and location FP is held in r2 when frame pointers
* enabled.
*
* SP -> (top of stack)
* - (callee saved registers)
* - (local variables)
* FP-8 -> previous FP \
* FP-4 -> return address |- or1k_frameinfo
* FP -> (previous top of stack) /
*/
void unwind_stack(void *data, unsigned long *stack,
void (*trace)(void *data, unsigned long addr, int reliable))
{
unsigned long *next_fp = NULL;
struct or1k_frameinfo *frameinfo = NULL;
int reliable = 0;
while (!kstack_end(stack)) {
frameinfo = container_of(stack,
struct or1k_frameinfo,
top);
if (__kernel_text_address(frameinfo->ra)) {
if (or1k_frameinfo_valid(frameinfo) &&
(next_fp == NULL ||
next_fp == &frameinfo->top)) {
reliable = 1;
next_fp = frameinfo->fp;
} else
reliable = 0;
trace(data, frameinfo->ra, reliable);
}
stack++;
}
}
#else /* CONFIG_FRAME_POINTER */
/*
* Create a stack trace by doing a simple scan treating all text addresses
* as return addresses.
*/
void unwind_stack(void *data, unsigned long *stack,
void (*trace)(void *data, unsigned long addr, int reliable))
{
unsigned long addr;
while (!kstack_end(stack)) {
addr = *stack++;
if (__kernel_text_address(addr))
trace(data, addr, 0);
}
}
#endif /* CONFIG_FRAME_POINTER */

2
arch/openrisc/lib/delay.c
View File

@ -25,7 +25,7 @@
int read_current_timer(unsigned long *timer_value)
{
*timer_value = mfspr(SPR_TTCR);
*timer_value = get_cycles();
return 0;
}

2
arch/openrisc/mm/Makefile
View File

@ -2,4 +2,4 @@
# Makefile for the linux openrisc-specific parts of the memory manager.
#
obj-y := fault.o tlb.o init.o ioremap.o
obj-y := fault.o cache.o tlb.o init.o ioremap.o

61
arch/openrisc/mm/cache.c Normal file
View File

@ -0,0 +1,61 @@
/*
* OpenRISC cache.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2015 Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <asm/spr.h>
#include <asm/spr_defs.h>
#include <asm/cache.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
static void cache_loop(struct page *page, const unsigned int reg)
{
unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT;
unsigned long line = paddr & ~(L1_CACHE_BYTES - 1);
while (line < paddr + PAGE_SIZE) {
mtspr(reg, line);
line += L1_CACHE_BYTES;
}
}
void local_dcache_page_flush(struct page *page)
{
cache_loop(page, SPR_DCBFR);
}
EXPORT_SYMBOL(local_dcache_page_flush);
void local_icache_page_inv(struct page *page)
{
cache_loop(page, SPR_ICBIR);
}
EXPORT_SYMBOL(local_icache_page_inv);
void update_cache(struct vm_area_struct *vma, unsigned long address,
pte_t *pte)
{
unsigned long pfn = pte_val(*pte) >> PAGE_SHIFT;
struct page *page = pfn_to_page(pfn);
int dirty = !test_and_set_bit(PG_dc_clean, &page->flags);
/*
* Since icaches do not snoop for updated data on OpenRISC, we
* must write back and invalidate any dirty pages manually. We
* can skip data pages, since they will not end up in icaches.
*/
if ((vma->vm_flags & VM_EXEC) && dirty)
sync_icache_dcache(page);
}

4
arch/openrisc/mm/fault.c
View File

@ -33,7 +33,7 @@ unsigned long pte_errors; /* updated by do_page_fault() */
/* __PHX__ :: - check the vmalloc_fault in do_page_fault()
* - also look into include/asm-or32/mmu_context.h
*/
volatile pgd_t *current_pgd;
volatile pgd_t *current_pgd[NR_CPUS];
extern void die(char *, struct pt_regs *, long);
@ -319,7 +319,7 @@ vmalloc_fault:
phx_mmu("vmalloc_fault");
*/
pgd = (pgd_t *)current_pgd + offset;
pgd = (pgd_t *)current_pgd[smp_processor_id()] + offset;
pgd_k = init_mm.pgd + offset;
/* Since we're two-level, we don't need to do both

2
arch/openrisc/mm/init.c
View File

@ -147,7 +147,7 @@ void __init paging_init(void)
* (even if it is most probably not used until the next
* switch_mm)
*/
current_pgd = init_mm.pgd;
current_pgd[smp_processor_id()] = init_mm.pgd;
end = (unsigned long)__va(max_low_pfn * PAGE_SIZE);

16
arch/openrisc/mm/tlb.c
View File

@ -49,7 +49,7 @@
*
*/
void flush_tlb_all(void)
void local_flush_tlb_all(void)
{
int i;
unsigned long num_tlb_sets;
@ -86,7 +86,7 @@ void flush_tlb_all(void)
#define flush_itlb_page_no_eir(addr) \
mtspr_off(SPR_ITLBMR_BASE(0), ITLB_OFFSET(addr), 0);
void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
{
if (have_dtlbeir)
flush_dtlb_page_eir(addr);
@ -99,8 +99,8 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
flush_itlb_page_no_eir(addr);
}
void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
void local_flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
int addr;
bool dtlbeir;
@ -129,13 +129,13 @@ void flush_tlb_range(struct vm_area_struct *vma,
* This should be changed to loop over over mm and call flush_tlb_range.
*/
void flush_tlb_mm(struct mm_struct *mm)
void local_flush_tlb_mm(struct mm_struct *mm)
{
/* Was seeing bugs with the mm struct passed to us. Scrapped most of
this function. */
/* Several architctures do this */
flush_tlb_all();
local_flush_tlb_all();
}
/* called in schedule() just before actually doing the switch_to */
@ -149,14 +149,14 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* might be invalid at points where we still need to derefer
* the pgd.
*/
current_pgd = next->pgd;
current_pgd[smp_processor_id()] = next->pgd;
/* We don't have context support implemented, so flush all
* entries belonging to previous map
*/
if (prev != next)
flush_tlb_mm(prev);
local_flush_tlb_mm(prev);
}

3
drivers/irqchip/Kconfig
View File

@ -151,6 +151,9 @@ config CLPS711X_IRQCHIP
select SPARSE_IRQ
default y
config OMPIC
bool
config OR1K_PIC
bool
select IRQ_DOMAIN

1
drivers/irqchip/Makefile
View File

@ -18,6 +18,7 @@ obj-$(CONFIG_DW_APB_ICTL) += irq-dw-apb-ictl.o
obj-$(CONFIG_METAG) += irq-metag-ext.o
obj-$(CONFIG_METAG_PERFCOUNTER_IRQS) += irq-metag.o
obj-$(CONFIG_CLPS711X_IRQCHIP) += irq-clps711x.o
obj-$(CONFIG_OMPIC) += irq-ompic.o
obj-$(CONFIG_OR1K_PIC) += irq-or1k-pic.o
obj-$(CONFIG_ORION_IRQCHIP) += irq-orion.o
obj-$(CONFIG_OMAP_IRQCHIP) += irq-omap-intc.o

202
drivers/irqchip/irq-ompic.c Normal file
View File

@ -0,0 +1,202 @@
/*
* Open Multi-Processor Interrupt Controller driver
*
* Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
* Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
* The ompic device handles IPI communication between cores in multi-core
* OpenRISC systems.
*
* Registers
*
* For each CPU the ompic has 2 registers. The control register for sending
* and acking IPIs and the status register for receiving IPIs. The register
* layouts are as follows:
*
* Control register
* +---------+---------+----------+---------+
* | 31 | 30 | 29 .. 16 | 15 .. 0 |
* ----------+---------+----------+----------
* | IRQ ACK | IRQ GEN | DST CORE | DATA |
* +---------+---------+----------+---------+
*
* Status register
* +----------+-------------+----------+---------+
* | 31 | 30 | 29 .. 16 | 15 .. 0 |
* -----------+-------------+----------+---------+
* | Reserved | IRQ Pending | SRC CORE | DATA |
* +----------+-------------+----------+---------+
*
* Architecture
*
* - The ompic generates a level interrupt to the CPU PIC when a message is
* ready. Messages are delivered via the memory bus.
* - The ompic does not have any interrupt input lines.
* - The ompic is wired to the same irq line on each core.
* - Devices are wired to the same irq line on each core.
*
* +---------+ +---------+
* | CPU | | CPU |
* | Core 0 |<==\ (memory access) /==>| Core 1 |
* | [ PIC ]| | | | [ PIC ]|
* +----^-^--+ | | +----^-^--+
* | | v v | |
* <====|=|=================================|=|==> (memory bus)
* | | ^ ^ | |
* (ipi | +------|---------+--------|-------|-+ (device irq)
* irq | | | | |
* core0)| +------|---------|--------|-------+ (ipi irq core1)
* | | | | |
* +----o-o-+ | +--------+ |
* | ompic |<===/ | Device |<===/
* | IPI | +--------+
* +--------+*
*
*/
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/irqchip.h>
#define OMPIC_CPUBYTES 8
#define OMPIC_CTRL(cpu) (0x0 + (cpu * OMPIC_CPUBYTES))
#define OMPIC_STAT(cpu) (0x4 + (cpu * OMPIC_CPUBYTES))
#define OMPIC_CTRL_IRQ_ACK (1 << 31)
#define OMPIC_CTRL_IRQ_GEN (1 << 30)
#define OMPIC_CTRL_DST(cpu) (((cpu) & 0x3fff) << 16)
#define OMPIC_STAT_IRQ_PENDING (1 << 30)
#define OMPIC_DATA(x) ((x) & 0xffff)
DEFINE_PER_CPU(unsigned long, ops);
static void __iomem *ompic_base;
static inline u32 ompic_readreg(void __iomem *base, loff_t offset)
{
return ioread32be(base + offset);
}
static void ompic_writereg(void __iomem *base, loff_t offset, u32 data)
{
iowrite32be(data, base + offset);
}
static void ompic_raise_softirq(const struct cpumask *mask,
unsigned int ipi_msg)
{
unsigned int dst_cpu;
unsigned int src_cpu = smp_processor_id();
for_each_cpu(dst_cpu, mask) {
set_bit(ipi_msg, &per_cpu(ops, dst_cpu));
/*
* On OpenRISC the atomic set_bit() call implies a memory
* barrier. Otherwise we would need: smp_wmb(); paired
* with the read in ompic_ipi_handler.
*/
ompic_writereg(ompic_base, OMPIC_CTRL(src_cpu),
OMPIC_CTRL_IRQ_GEN |
OMPIC_CTRL_DST(dst_cpu) |
OMPIC_DATA(1));
}
}
static irqreturn_t ompic_ipi_handler(int irq, void *dev_id)
{
unsigned int cpu = smp_processor_id();
unsigned long *pending_ops = &per_cpu(ops, cpu);
unsigned long ops;
ompic_writereg(ompic_base, OMPIC_CTRL(cpu), OMPIC_CTRL_IRQ_ACK);
while ((ops = xchg(pending_ops, 0)) != 0) {
/*
* On OpenRISC the atomic xchg() call implies a memory
* barrier. Otherwise we may need an smp_rmb(); paired
* with the write in ompic_raise_softirq.
*/
do {
unsigned long ipi_msg;
ipi_msg = __ffs(ops);
ops &= ~(1UL << ipi_msg);
handle_IPI(ipi_msg);
} while (ops);
}
return IRQ_HANDLED;
}
static int __init ompic_of_init(struct device_node *node,
struct device_node *parent)
{
struct resource res;
int irq;
int ret;
/* Validate the DT */
if (ompic_base) {
pr_err("ompic: duplicate ompic's are not supported");
return -EEXIST;
}
if (of_address_to_resource(node, 0, &res)) {
pr_err("ompic: reg property requires an address and size");
return -EINVAL;
}
if (resource_size(&res) < (num_possible_cpus() * OMPIC_CPUBYTES)) {
pr_err("ompic: reg size, currently %d must be at least %d",
resource_size(&res),
(num_possible_cpus() * OMPIC_CPUBYTES));
return -EINVAL;
}
/* Setup the device */
ompic_base = ioremap(res.start, resource_size(&res));
if (IS_ERR(ompic_base)) {
pr_err("ompic: unable to map registers");
return PTR_ERR(ompic_base);
}
irq = irq_of_parse_and_map(node, 0);
if (irq <= 0) {
pr_err("ompic: unable to parse device irq");
ret = -EINVAL;
goto out_unmap;
}
ret = request_irq(irq, ompic_ipi_handler, IRQF_PERCPU,
"ompic_ipi", NULL);
if (ret)
goto out_irq_disp;
set_smp_cross_call(ompic_raise_softirq);
return 0;
out_irq_disp:
irq_dispose_mapping(irq);
out_unmap:
iounmap(ompic_base);
ompic_base = NULL;
return ret;
}
IRQCHIP_DECLARE(ompic, "openrisc,ompic", ompic_of_init);