23 Oct, 2015
1 commit
-
commit fc2ca674470bbfe11d72a20a3f19fd3dc43bfca0 upstream.
Commit 3adeb2566b9b ("MIPS: Loongson: Improve LEFI firmware interface")
made the number of UARTs dynamic if LEFI_FIRMWARE_INTERFACE is configured.
Unfortunately, it did not initialize the number of UARTs if
LEFI_FIRMWARE_INTERFACE is not configured. As a result, the Fulong2e
system has no console.Fixes: 3adeb2566b9b ("MIPS: Loongson: Improve LEFI firmware interface")
Acked-by: Huacai Chen
Signed-off-by: Guenter Roeck
Tested-by: Markos Chandras
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11076/
Signed-off-by: Ralf Baechle
Signed-off-by: Greg Kroah-Hartman
10 Jun, 2015
1 commit
-
If CONFIG_SERIAL_8250 is set to m, the Loongson seria.ko module might get
unloaded while the serial driver modules are still loaded resulting in
stale references to the destroyed platform_device instance.Anyway, platform devices should always be registered indicated what
devices are present, _not_ what drivers have been configured.Signed-off-by: Ralf Baechle
Reported-by: Paul Gortmaker
Patchwork: https://patchwork.linux-mips.org/patch/10538/
06 Jun, 2015
1 commit
-
setup_per_cpu_areas() only setup __per_cpu_offset[] for each possible
cpu, but loongson_sysconf.nr_cpus can be greater than possible cpus
(due to reserved_cpus_mask). So in loongson3_ipi_interrupt(), percpu
access will touch the original varible in .data..percpu section which
has been freed. Without this patch, cpu-hotplug will cause memery
corruption.Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: http://patchwork.linux-mips.org/patch/10524/
Signed-off-by: Ralf Baechle
21 Apr, 2015
1 commit
-
Pull final removal of deprecated cpus_* cpumask functions from Rusty Russell:
"This is the final removal (after several years!) of the obsolete
cpus_* functions, prompted by their mis-use in staging.With these function removed, all cpu functions should only iterate to
nr_cpu_ids, so we finally only allocate that many bits when cpumasks
are allocated offstack"* tag 'cpumask-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (25 commits)
cpumask: remove __first_cpu / __next_cpu
cpumask: resurrect CPU_MASK_CPU0
linux/cpumask.h: add typechecking to cpumask_test_cpu
cpumask: only allocate nr_cpumask_bits.
Fix weird uses of num_online_cpus().
cpumask: remove deprecated functions.
mips: fix obsolete cpumask_of_cpu usage.
x86: fix more deprecated cpu function usage.
ia64: remove deprecated cpus_ usage.
powerpc: fix deprecated CPU_MASK_CPU0 usage.
CPU_MASK_ALL/CPU_MASK_NONE: remove from deprecated region.
staging/lustre/o2iblnd: Don't use cpus_weight
staging/lustre/libcfs: replace deprecated cpus_ calls with cpumask_
staging/lustre/ptlrpc: Do not use deprecated cpus_* functions
blackfin: fix up obsolete cpu function usage.
parisc: fix up obsolete cpu function usage.
tile: fix up obsolete cpu function usage.
arm64: fix up obsolete cpu function usage.
mips: fix up obsolete cpu function usage.
x86: fix up obsolete cpu function usage.
...
18 Apr, 2015
1 commit
-
Pull GPIO updates from Linus Walleij:
"This is the bulk of GPIO changes for the v4.1 development cycle:- A new GPIO hogging mechanism has been added. This can be used on
boards that want to drive some GPIO line high, low, or set it as
input on boot and then never touch it again. For some embedded
systems this is bliss and simplifies things to a great extent.- Some API cleanup and closure: gpiod_get_array() and
gpiod_put_array() has been added to get and put GPIOs in bulk as
was possible with the non-descriptor API.- Encapsulate cross-calls to the pin control subsystem in
. Now this should be the only header any GPIO
driver needs to include or something is wrong. Cleanups
restricting drivers to this include are welcomed if tested.- Sort the GPIO Kconfig and split it into submenus, as it was
becoming and unstructured, illogical and unnavigatable mess. I
hope this is easier to follow. Menus that require a certain
subsystem like I2C can now be hidden nicely for example, still
working on others.- New drivers:
- New driver for the Altera Soft GPIO.
- The F7188x driver now handles the F71869 and F71869A variants.
- The MIPS Loongson driver has been moved to drivers/gpio for
consolidation and cleanup.- Cleanups:
- The MAX732x is converted to use the GPIOLIB_IRQCHIP
infrastructure.- The PCF857x is converted to use the GPIOLIB_IRQCHIP
infrastructure.- Radical cleanup of the OMAP driver.
- Misc:
- Enable the DWAPB GPIO for all architectures. This is a "hard
IP" block from Synopsys which has started to turn up in so
diverse architectures as X86 Quark, ARC and a slew of ARM
systems. So even though it's not an expander, it's generic
enough to be available for all.- We add a mock GPIO on Crystalcove PMIC after a long discussion
with Daniel Vetter et al, tracing back to the shootout at the
kernel summit where DRM drivers and sub-componentization was
discussed. In this case a mock GPIO is assumed to be the best
compromise gaining some reuse of infrastructure without making
DRM drivers overly complex at the same time. Let's see"* tag 'gpio-v4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (62 commits)
Revert "gpio: sch: use uapi/linux/pci_ids.h directly"
gpio: dwapb: remove dependencies
gpio: dwapb: enable for ARC
gpio: removing kfree remove functionality
gpio: mvebu: Fix mask/unmask managment per irq chip type
gpio: split GPIO drivers in submenus
gpio: move MFD GPIO drivers under their own comment
gpio: move BCM Kona Kconfig option
gpio: arrange SPI Kconfig symbols alphabetically
gpio: arrange PCI GPIO controllers alphabetically
gpio: arrange I2C Kconfig symbols alphabetically
gpio: arrange Kconfig symbols alphabetically
gpio: ich: Implement get_direction function
gpio: use (!foo) instead of (foo == NULL)
gpio: arizona: drop owner assignment from platform_drivers
gpio: max7300: remove 'ret' variable
gpio: use devm_kzalloc
gpio: sch: use uapi/linux/pci_ids.h directly
gpio: x-gene: fix devm_ioremap_resource() check
gpio: loongson: Add Loongson-3A/3B GPIO driver support
...
13 Apr, 2015
1 commit
08 Apr, 2015
1 commit
-
Define the central place the default FCSR value is set from, initialised
in `cpu_probe'. Determine the FCSR mask applied to values written to
the register with CTC1 in the full emulation mode and via ptrace(2),
according to the ISA level of processor hardware or the writability of
bits 31:18 if actual FPU hardware is used.Software may rely on FCSR bits whose functions our emulator does not
implement, so it should not allow them to be set or software may get
confused. For ptrace(2) it's just sanity.[ralf@linux-mips.org: Fixed double inclusion of .]
Signed-off-by: Maciej W. Rozycki
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9711/
Signed-off-by: Ralf Baechle
07 Apr, 2015
2 commits
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Move Loongson-2's GPIO driver to drivers/gpio and add Kconfig options.
Acked-by: Ralf Baechle
Signed-off-by: Huacai Chen
Reviewed-by: Alexandre Courbot
Signed-off-by: Linus Walleij -
This cleanup is prepare to move the driver to drivers/gpio. Custom
definitions of gpio_get_value()/gpio_set_value() are dropped.Acked-by: Ralf Baechle
Signed-off-by: Huacai Chen
Reviewed-by: Alexandre Courbot
Signed-off-by: Linus Walleij
01 Apr, 2015
3 commits
-
This add south-bridge (SB700/SB710/SB800 chipset) ACPI platform driver
for Loongson-3. This will be used by EC (Embedded Controller, used by
laptops) driver and STR (Suspend To RAM).[ralf@linux-mips.org: Fix build error if !CONFIG_CPU_LOONGSON3. Build
doesn't like it if no obj-* variable is defined at all in a Makefile.
Obviously this has not been tested on other platforms.]Signed-off-by: Huacai Chen
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/9619/
Signed-off-by: Ralf Baechle -
This add CPU Hwmon (temperature sensor) platform driver for Loongson-3.
Signed-off-by: Huacai Chen
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/9617/
Signed-off-by: Ralf Baechle -
This removes the use of the IRQF_DISABLED flag
from arch/mips/loongson/loongson-3/hpet.cIt's a NOOP since 2.6.35.
Signed-off-by: Michael Opdenacker
Cc: chenhc@lemote.com
Cc: taohl@lemote.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9609/
Signed-off-by: Ralf Baechle
25 Mar, 2015
1 commit
-
HPET irq is routed to i8259 and then to MIPS CPU irq (cascade). After
commit a3e6c1eff5 (MIPS: IRQ: Fix disable_irq on CPU IRQs), if without
IRQF_NO_SUSPEND in cascade_irqaction, HPET interrupts will lost during
suspend. The result is machine cannot be waken up.Signed-off-by: Huacai Chen
Cc:
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/9528/
Signed-off-by: Ralf Baechle
05 Mar, 2015
1 commit
-
Thanks to spatch, plus manual removal of "&*". Then a sweep for
for_each_cpu_mask => for_each_cpu.Signed-off-by: Rusty Russell
Cc: Ralf Baechle
Cc: Kevin Cernekee
Cc: Florian Fainelli
Cc: linux-mips@linux-mips.org
12 Dec, 2014
1 commit
-
Pull MIPS updates from Ralf Baechle:
"This is an unusually large pull request for MIPS - in parts because
lots of patches missed the 3.18 deadline but primarily because some
folks opened the flood gates.- Retire the MIPS-specific phys_t with the generic phys_addr_t.
- Improvments for the backtrace code used by oprofile.
- Better backtraces on SMP systems.
- Cleanups for the Octeon platform code.
- Cleanups and fixes for the Loongson platform code.
- Cleanups and fixes to the firmware library.
- Switch ATH79 platform to use the firmware library.
- Grand overhault to the SEAD3 and Malta interrupt code.
- Move the GIC interrupt code to drivers/irqchip
- Lots of GIC cleanups and updates to the GIC code to use modern IRQ
infrastructures and features of the kernel.
- OF documentation updates for the GIC bindings
- Move GIC clocksource driver to drivers/clocksource
- Merge GIC clocksource driver with clockevent driver.
- Further updates to bring the GIC clocksource driver up to date.
- R3000 TLB code cleanups
- Improvments to the Loongson 3 platform code.
- Convert pr_warning to pr_warn.
- Merge a bunch of small lantiq and ralink fixes that have been
staged/lingering inside the openwrt tree for a while.
- Update archhelp for IP22/IP32
- Fix a number of issues for Loongson 1B.
- New clocksource and clockevent driver for Loongson 1B.
- Further work on clk handling for Loongson 1B.
- Platform work for Broadcom BMIPS.
- Error handling cleanups for TurboChannel.
- Fixes and optimization to the microMIPS support.
- Option to disable the FTLB.
- Dump more relevant information on machine check exception
- Change binfmt to allow arch to examine PT_*PROC headers
- Support for new style FPU register model in O32
- VDSO randomization.
- BCM47xx cleanups
- BCM47xx reimplement the way the kernel accesses NVRAM information.
- Random cleanups
- Add support for ATH25 platforms
- Remove pointless locking code in some PCI platforms.
- Some improvments to EVA support
- Minor Alchemy cleanup"* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (185 commits)
MIPS: Add MFHC0 and MTHC0 instructions to uasm.
MIPS: Cosmetic cleanups of page table headers.
MIPS: Add CP0 macros for extended EntryLo registers
MIPS: Remove now unused definition of phys_t.
MIPS: Replace use of phys_t with phys_addr_t.
MIPS: Replace MIPS-specific 64BIT_PHYS_ADDR with generic PHYS_ADDR_T_64BIT
PCMCIA: Alchemy Don't select 64BIT_PHYS_ADDR in Kconfig.
MIPS: lib: memset: Clean up some MIPS{EL,EB} ifdefery
MIPS: iomap: Use __mem_{read,write}{b,w,l} for MMIO
MIPS: fix indentation.
MAINTAINERS: Add entry for BMIPS multiplatform kernel
MIPS: Enable VDSO randomization
MIPS: Remove a temporary hack for debugging cache flushes in SMTC configuration
MIPS: Remove declaration of obsolete arch_init_clk_ops()
MIPS: atomic.h: Reformat to fit in 79 columns
MIPS: Apply `.insn' to fixup labels throughout
MIPS: Fix microMIPS LL/SC immediate offsets
MIPS: Kconfig: Only allow 32-bit microMIPS builds
MIPS: signal.c: Fix an invalid cast in ISA mode bit handling
MIPS: mm: Only build one microassembler that is suitable
...
24 Nov, 2014
13 commits
-
Make loongson_rtc_resources static to eliminate the following
sparse warning:
warning: symbol 'loongson_rtc_resources' was not declared. Should it be static?Signed-off-by: Aaro Koskinen
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8529/
Signed-off-by: Ralf Baechle -
Add a missing include to eliminate the following sparse warnings:
warning: symbol 'prom_init' was not declared. Should it be static?
warning: symbol 'prom_free_prom_memory' was not declared. Should it be static?Signed-off-by: Aaro Koskinen
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8531/
Signed-off-by: Ralf Baechle -
Make ml2f_reboot static to elimite the following sparse warning:
warning: symbol 'ml2f_reboot' was not declared. Should it be static?Signed-off-by: Aaro Koskinen
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8528/
Signed-off-by: Ralf Baechle -
Make internal static to eliminate the following sparse warnings:
warning: symbol 'ip6_irqaction' was not declared. Should it be static?
warning: symbol 'cascade_irqaction' was not declared. Should it be static?Signed-off-by: Aaro Koskinen
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8527/
Signed-off-by: Ralf Baechle -
Add a missing include to get rid of the following sparse warning:
warning: symbol 'plat_mem_setup' was not declared. Should it be static?Signed-off-by: Aaro Koskinen
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8530/
Signed-off-by: Ralf Baechle -
Add a missing include to get rid of the following sparse warnings:
warning: symbol 'cs5536_pci_conf_write4' was not declared. Should it be static?
warning: symbol 'cs5536_pci_conf_read4' was not declared. Should it be static?Signed-off-by: Aaro Koskinen
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8526/
Signed-off-by: Ralf Baechle -
Fix array initializer syntax to get rid of the following sparse warnings:
"obsolete array initializer, use C99 syntax".Signed-off-by: Aaro Koskinen
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8525/
Signed-off-by: Ralf Baechle -
CPUFreq driver need external timer, so add hpet at first.
In Loongson 3, only Core-0 can receive external interrupt. As a result,
timekeeping cannot absolutely use HPET timer. We use a hybrid solution:
Core-0 use HPET as its clock event device, but other cores still use
MIPS; clock source is global and doesn't need interrupt, so use HPET.Signed-off-by: Huacai Chen
Signed-off-by: Hongliang Tao
Cc: John Crispin
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/8329/
Signed-off-by: Ralf Baechle -
Machtypes of Loongson-3 machines become more and more, but there are
only small differences among different machtypes. Keeping a large table
of machtypes is very ugly and hard to extend. We found that the major
machtype differences are UARTs information (number of UARTs, UART IRQs,
UART clocks, etc.), platform devices (EC, temperature sensors, fan
controllers, etc.) and some workarounds (because of some CPU bugs or
mainboard bugs).In this patch we improve the UEFI-like (LEFI) interface to make all
Loongson-3 machines use a same machtype "generic-loongson-machine".Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/8324/
Signed-off-by: Ralf Baechle -
By offering Logical->Physical core id mapping, so as to reserve some
physical cores via mask. This allow booting from any core when core-0
has problems. Since the maximun cores supported by Loongson-3 is 16,
32-bit cpu_startup_core_id can be split to 16-bit cpu_startup_core_id
and 16-bit reserved_cores_mask for compatibility.Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/8323/
Signed-off-by: Ralf Baechle -
The width of HT-bus is only 40-bit, but Loongson-3 has 48-bit physical
address. This implies only node-0's memory is DMAable because high bits
(Node ID) will lost. Fortunately, by configuring address windows in
firmware, we can extract 2bit Node ID (bit 44~47, only bit 44~45 used
now) from Loongson-3's 48-bit address space and embed it into 40-bit
(bit 37~38). Every NUMA node can do DMA now (however, maximum memory of
each node is reduced to 2^37 = 128GB).Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/8321/
Signed-off-by: Ralf Baechle -
Based on the spatch
@@
expression e;
@@
- return (e);
+ return e;with heavy hand editing because some of the changes are either whitespace
or identation only or result in excessivly long lines.Signed-off-by: Ralf Baechle
-
If SERIAL_8250 is compiled as a module, the platform specific setup
for Loongson will be a module too, and it will not work very well.
At least on Loongson 3 it will trigger a build failure,
since loongson_sysconf is not exported to modules.Fix by making the platform specific serial code always built-in.
Signed-off-by: Aaro Koskinen
Reported-by: Ralf Baechle
Cc: stable@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: Huacai Chen
Cc: Markos Chandras
Patchwork: https://patchwork.linux-mips.org/patch/8533/
Signed-off-by: Ralf Baechle
20 Nov, 2014
1 commit
-
export the __node_distances symbol in the loongson3 numa code to fix the
build error:Building modules, stage 2.
MODPOST 221 modules
ERROR: "__node_distances" [drivers/block/nvme.ko] undefined!
scripts/Makefile.modpost:90: recipe for target '__modpost' failedwhen building the kernel with:
CONFIG_CPU_LOONGSON3=y
CONFIG_NUMA=y
CONFIG_BLK_DEV_NVME=mSigned-off-by: James Cowgill
Cc: # v3.17+
Reviewed-by: James Hogan
Reviewed-by: Huacai Chen
Cc: linux-mips@linux-mips.org
Cc: Wei Yongjun
Patchwork: https://patchwork.linux-mips.org/patch/8444/
Signed-off-by: Ralf Baechle
23 Oct, 2014
1 commit
-
During 3.16 merge window, parts of the commit 8e8acb32960f
(MIPS/loongson2_cpufreq: Fix CPU clock rate setting) seem to have
been deleted probably due to a mismerge, and as a result cpufreq
is broken again on Loongson2 boards in 3.16 and newer kernels.
Fix by repeating the fix.Signed-off-by: Aaro Koskinen
Cc: stable@vger.kernel.org # 3.16
Cc: Rafael J. Wysocki
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7835/
Signed-off-by: Ralf Baechle
15 Oct, 2014
1 commit
-
Pull percpu consistent-ops changes from Tejun Heo:
"Way back, before the current percpu allocator was implemented, static
and dynamic percpu memory areas were allocated and handled separately
and had their own accessors. The distinction has been gone for many
years now; however, the now duplicate two sets of accessors remained
with the pointer based ones - this_cpu_*() - evolving various other
operations over time. During the process, we also accumulated other
inconsistent operations.This pull request contains Christoph's patches to clean up the
duplicate accessor situation. __get_cpu_var() uses are replaced with
with this_cpu_ptr() and __this_cpu_ptr() with raw_cpu_ptr().Unfortunately, the former sometimes is tricky thanks to C being a bit
messy with the distinction between lvalues and pointers, which led to
a rather ugly solution for cpumask_var_t involving the introduction of
this_cpu_cpumask_var_ptr().This converts most of the uses but not all. Christoph will follow up
with the remaining conversions in this merge window and hopefully
remove the obsolete accessors"* 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (38 commits)
irqchip: Properly fetch the per cpu offset
percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t -fix
ia64: sn_nodepda cannot be assigned to after this_cpu conversion. Use __this_cpu_write.
percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t
Revert "powerpc: Replace __get_cpu_var uses"
percpu: Remove __this_cpu_ptr
clocksource: Replace __this_cpu_ptr with raw_cpu_ptr
sparc: Replace __get_cpu_var uses
avr32: Replace __get_cpu_var with __this_cpu_write
blackfin: Replace __get_cpu_var uses
tile: Use this_cpu_ptr() for hardware counters
tile: Replace __get_cpu_var uses
powerpc: Replace __get_cpu_var uses
alpha: Replace __get_cpu_var
ia64: Replace __get_cpu_var uses
s390: cio driver &__get_cpu_var replacements
s390: Replace __get_cpu_var uses
mips: Replace __get_cpu_var uses
MIPS: Replace __get_cpu_var uses in FPU emulator.
arm: Replace __this_cpu_ptr with raw_cpu_ptr
...
27 Aug, 2014
1 commit
-
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++Converts to
__this_cpu_inc(y)
Cc: Ralf Baechle
Signed-off-by: Christoph Lameter
Signed-off-by: Tejun Heo
20 Aug, 2014
1 commit
-
In preemptible kernel, only TIF_USEDFPU flag is reliable to distinguish
whether _init_fpu()/_restore_fp() is needed. Because the value of the
CP0_Status.CU1 isn't changed during preemption.V2: Fix coding style.
Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: Aurelien Jarno
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/7515/
Signed-off-by: Ralf Baechle
19 Aug, 2014
1 commit
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Signed-off-by: Wei Yongjun
Cc: Huacai Chen
Cc: Wei Yongjun
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7537/
Signed-off-by: Ralf Baechle
31 Jul, 2014
5 commits
-
Since this CONFIG option will be used for both Loongson-3A/3B machines,
and not all Loongson-3 machines are produced by Lemote, we rename
CONFIG_LEMOTE_MACH3A to CONFIG_LOONGSON_MACH3X.Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: Aurelien Jarno
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/7190/
Signed-off-by: Ralf Baechle -
Loongson-3 has some specific instructions (MMI/SIMD) in coprocessor 2.
COP2 isn't independent because it share COP1 (FPU)'s registers. This
patch enable the COP2 usage so user-space programs can use the MMI/SIMD
instructions. When COP2 exception happens, we enable both COP1 (FPU)
and COP2, only in this way the fp context can be saved and restored
correctly.Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: Aurelien Jarno
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/7189/
Signed-off-by: Ralf Baechle -
Loongson-3B is a 8-cores processor. In general it looks like there are
two Loongson-3A integrated in one chip: 8 cores are separated into two
groups (two NUMA node), each node has its own local memory.Of course there are some differences between one Loongson-3B and two
Loongson-3A. E.g., the base addresses of IPI registers of each node are
not the same; Loongson-3A use ChipConfig register to enable/disable
clock, but Loongson-3B use FreqControl register instead.There are two revision of Loongson-3B, the first revision is called as
Loongson-3B1000, whose frequency is 1GHz and has a PRid 0x6306, the
second revision is called as Loongson-3B1500, whose frequency is 1.5GHz
and has a PRid 0x6307. Both revisions has a bug that clock cannot be
disabled at runtime, but this will be fixed in future.Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: Aurelien Jarno
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/7188/
Signed-off-by: Ralf Baechle -
Multiple Loongson-3A chips can be interconnected with HT0-bus. This is
a CC-NUMA system that every chip (node) has its own local memory and
cache coherency is maintained by hardware. The 64-bit physical memory
address format is as follows:0x-0000-YZZZ-ZZZZ-ZZZZ
The high 16 bits should be 0, which means the real physical address
supported by Loongson-3 is 48-bit. The "Y" bits is the base address of
each node, which can be also considered as the node-id. The "Z" bits is
the address offset within a node, which means every node has a 44 bits
address space.Macros XPHYSADDR and MAX_PHYSMEM_BITS are modified unconditionally,
because many other MIPS CPUs have also extended their address spaces.Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: Aurelien Jarno
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/7187/
Signed-off-by: Ralf Baechle -
This patch is prepared for Multi-chip interconnection. Since each chip
has a ChipConfig register, LOONGSON_CHIPCFG should be an array.Signed-off-by: Huacai Chen
Cc: John Crispin
Cc: Steven J. Hill
Cc: Aurelien Jarno
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang
Cc: Zhangjin Wu
Patchwork: https://patchwork.linux-mips.org/patch/7185/
Signed-off-by: Ralf Baechle
10 Jun, 2014
1 commit
-
Pull MIPS updates from Ralf Baechle:
- three fixes for 3.15 that didn't make it in time
- limited Octeon 3 support.
- paravirtualization support
- improvment to platform support for Netlogix SOCs.
- add support for powering down the Malta eval board in software
- add many instructions to the in-kernel microassembler.
- add support for the BPF JIT.
- minor cleanups of the BCM47xx code.
- large cleanup of math emu code resulting in significant code size
reduction, better readability of the code and more accurate
emulation.
- improvments to the MIPS CPS code.
- support C3 power status for the R4k count/compare clock device.
- improvments to the GIO support for older SGI workstations.
- increase number of supported CPUs to 256; this can be reached on
certain embedded multithreaded ccNUMA configurations.
- various small cleanups, updates and fixes* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (173 commits)
MIPS: IP22/IP28: Improve GIO support
MIPS: Octeon: Add twsi interrupt initialization for OCTEON 3XXX, 5XXX, 63XX
DEC: Document the R4k MB ASIC mini interrupt controller
DEC: Add self as the maintainer
MIPS: Add microMIPS MSA support.
MIPS: Replace calls to obsolete strict_strto call with kstrto* equivalents.
MIPS: Replace obsolete strict_strto call with kstrto
MIPS: BFP: Simplify code slightly.
MIPS: Call find_vma with the mmap_sem held
MIPS: Fix 'write_msa_##' inline macro.
MIPS: Fix MSA toolchain support detection.
mips: Update the email address of Geert Uytterhoeven
MIPS: Add minimal defconfig for mips_paravirt
MIPS: Enable build for new system 'paravirt'
MIPS: paravirt: Add pci controller for virtio
MIPS: Add code for new system 'paravirt'
MIPS: Add functions for hypervisor call
MIPS: OCTEON: Add OCTEON3 to __get_cpu_type
MIPS: Add function get_ebase_cpunum
MIPS: Add minimal support for OCTEON3 to c-r4k.c
...