- 27 May, 2020 13 commits
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Bibo Mao authored
If original PTE has _PAGE_ACCESSED bit set, and new pte has no _PAGE_NO_READ bit set, we can add _PAGE_SILENT_READ bit to enable page valid bit. Signed-off-by:
Bibo Mao <maobibo@loongson.cn> Signed-off-by:
Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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Bibo Mao authored
Here add pte_sw_mkyoung function to make page readable on MIPS platform during page fault handling. This patch improves page fault latency about 10% on my MIPS machine with lmbench lat_pagefault case. It is noop function on other arches, there is no negative influence on those architectures. Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Bibo Mao authored
If two threads concurrently fault at the same page, the thread that won the race updates the PTE and its local TLB. For now, the other thread gives up, simply does nothing, and continues. It could happen that this second thread triggers another fault, whereby it only updates its local TLB while handling the fault. Instead of triggering another fault, let's directly update the local TLB of the second thread. Function update_mmu_tlb is used here to update local TLB on the second thread, and it is defined as empty on other arches. Signed-off-by:
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Bibo Mao authored
It is not necessary to flush tlb page on all CPUs if suitable PTE entry exists already during page fault handling, just updating TLB is fine. Here redefine flush_tlb_fix_spurious_fault as empty on MIPS system. Signed-off-by:
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Paul Cercueil authored
Having a generic board option makes it possible to create a kernel that will run on various Ingenic SoCs, as long as the right devicetree is provided. Signed-off-by:
Paul Cercueil <paul@crapouillou.net> Signed-off-by:
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Paul Cercueil authored
Add support for the GCW Zero prototype. The only (?) difference is that it only has 256 MiB of RAM, compared to the 512 MiB of RAM of the retail device. Signed-off-by:
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Paul Cercueil authored
Add memory info of the GCW Zero in its devicetree. The bootloader generally provides this information, but since it is fixed to 512 MiB, it doesn't hurt to have it in devicetree. It allows the kernel to boot without any parameter passed as argument. Signed-off-by:
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Jiaxun Yang authored
We can now enable generic PCI driver in Kconfig, and remove legacy PCI driver code. Radeon vbios quirk is moved to the platform folder to fit the new structure. Signed-off-by:
Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by:
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Jiaxun Yang authored
Add PCI Host controller node for Loongson64 with RS780E PCH dts. Note that PCI interrupts are probed via legacy way, as different machine have different interrupt arrangement, we can't cover all of them in dt. Signed-off-by:
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Jiaxun Yang authored
PCI host controller found on Loongson PCHs and SoCs. Signed-off-by:
Rob Herring <robh@kernel.org> Signed-off-by:
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Jiaxun Yang authored
This controller can be found on Loongson-2K SoC, Loongson-3 systems with RS780E/LS7A PCH. The RS780E part of code was previously located at arch/mips/pci/ops-loongson3.c and now it can use generic PCI driver implementation. Signed-off-by:
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by:
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Jiaxun Yang authored
Don't disable MEM/IO decoding when a device have both non_compliant_bars and mmio_always_on. That would allow us quirk devices with junk in BARs but can't disable their decoding. Signed-off-by:
Bjorn Helgaas <helgaas@kernel.org> Signed-off-by:
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Álvaro Fernández Rojas authored
MISC_STRAP_BUS_BOOT_SEL_SHIFT is 18 according to Broadcom's GPL source code. Signed-off-by:
Álvaro Fernández Rojas <noltari@gmail.com> Acked-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
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- 25 May, 2020 1 commit
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Daniel González Cabanelas authored
The BCM6358 SoC has only 38 available GPIOs. Fix it. Signed-off-by:
Daniel González Cabanelas <dgcbueu@gmail.com> Signed-off-by:
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- 24 May, 2020 6 commits
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Kaige Li authored
There is a file descriptor resource leak in elf-entry.c, fix this by adding fclose() before return and die. Signed-off-by:
Kaige Li <likaige@loongson.cn> Signed-off-by:
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Joshua Kinard authored
Fix the ordering of the macros in arch/mips/mach-ip30/war.h to match those in arch/mips/mach-ip27/war.h. Signed-off-by:
Joshua Kinard <kumba@gentoo.org> Signed-off-by:
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WANG Xuerui authored
CPUCFG is the instruction for querying processor characteristics on newer Loongson processors, much like CPUID of x86. Since the instruction is supposedly designed to provide a unified way to do feature detection (without having to, for example, parse /proc/cpuinfo which is too heavyweight), it is important to provide compatibility for older cores without native support. Fortunately, most of the fields can be synthesized without changes to semantics. Performance is not really big a concern, because feature detection logic is not expected to be invoked very often in typical userland applications. The instruction can't be emulated on LOONGSON_2EF cores, according to FlyGoat's experiments. Because the LWC2 opcode is assigned to other valid instructions on 2E and 2F, no RI exception is raised for us to intercept. So compatibility is only extended back furthest to Loongson-3A1000. Loongson-2K is covered too, as it is basically a remix of various blocks from the 3A/3B models from a kernel perspective. This is lightly based on Loongson's work on their Linux 3.10 fork, for being the authority on the right feature flags to fill in, where things aren't otherwise discoverable. Signed-off-by:
WANG Xuerui <git@xen0n.name> Reviewed-by:
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Huacai Chen authored
CP0.Config6 is a Vendor-defined register whose bits definitions are different from one to another. Recently, Xuerui's Loongson-3 patch and Serge's P5600 patch make the definitions inconsistency and unclear. To make life easy, this patch tidy the definition up: 1, Add a _MTI_ infix for proAptiv/P5600 feature bits; 2, Add a _LOONGSON_ infix for Loongson-3 feature bits; 3, Add bit6/bit7 definition for Loongson-3 which will be used later. All existing users of these macros are updated. Cc: WANG Xuerui <git@xen0n.name> Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru> Signed-off-by:
Huacai Chen <chenhc@lemote.com> Signed-off-by:
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Tiezhu Yang authored
Add config check in Makefile to only build the subdir of current platform. E.g. without this patch: AR arch/mips/built-in.a AR arch/mips/boot/dts/brcm/built-in.a AR arch/mips/boot/dts/cavium-octeon/built-in.a AR arch/mips/boot/dts/img/built-in.a AR arch/mips/boot/dts/ingenic/built-in.a AR arch/mips/boot/dts/lantiq/built-in.a DTC arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dtb DTB arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dtb.S AS arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dtb.o DTC arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dtb DTB arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dtb.S AS arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dtb.o AR arch/mips/boot/dts/loongson/built-in.a AR arch/mips/boot/dts/mscc/built-in.a AR arch/mips/boot/dts/mti/built-in.a AR arch/mips/boot/dts/netlogic/built-in.a AR arch/mips/boot/dts/ni/built-in.a AR arch/mips/boot/dts/pic32/built-in.a AR arch/mips/boot/dts/qca/built-in.a AR arch/mips/boot/dts/ralink/built-in.a AR arch/mips/boot/dts/xilfpga/built-in.a AR arch/mips/boot/dts/built-in.a With this patch: AR arch/mips/built-in.a DTC arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dtb DTB arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dtb.S AS arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dtb.o DTC arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dtb DTB arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dtb.S AS arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dtb.o AR arch/mips/boot/dts/loongson/built-in.a AR arch/mips/boot/dts/built-in.a Signed-off-by:
Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by:
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Ben Hutchings authored
The exception handler subroutines are declared as a single char, but when copied to the required addresses the copy length is 0x80. When range checks are enabled for memcpy() this results in a build failure, with error messages such as: In file included from arch/mips/mti-malta/malta-init.c:15: In function 'memcpy', inlined from 'mips_nmi_setup' at arch/mips/mti-malta/malta-init.c:98:2: include/linux/string.h:376:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter 376 | __read_overflow2(); | ^~~~~~~~~~~~~~~~~~ Change the declarations to use type char[]. Signed-off-by:Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
YunQiang Su <syq@debian.org> Signed-off-by:
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- 22 May, 2020 9 commits
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Serge Semin authored
Due to being embedded into the CPU cores MIPS count/compare timer frequency is changed together with the CPU clocks alteration. In case if frequency really changes the kernel clockevent framework must be notified, otherwise the kernel timers won't work correctly. Fix this by calling clockevents_update_freq() for each r4k clockevent handlers registered per available CPUs. Traditionally MIPS r4k-clock are clocked with CPU frequency divided by 2. But this isn't true for some of the platforms. Due to this we have to save the basic CPU frequency, so then use it to scale the initial timer frequency (mips_hpt_frequency) and pass the updated value further to the clockevent framework. Signed-off-by:
Serge Semin <Sergey.Semin@baikalelectronics.ru> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: devicetree@vger.kernel.org Signed-off-by:
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Serge Semin authored
Commit 07d69579 ("MIPS: Don't register r4k sched clock when CPUFREQ enabled") disabled the r4k-clock usage for scheduler ticks counting due to the scheduler being non-tolerant for unstable clocks sources. For the same reason the clock should be used in the system clocksource framework with care. As soon as CPU frequency changes the clocksource framework should be notified about this by marking the R4K timer being unstable (which it really is, since the ticks rate has been changed synchronously with the CPU frequency). Signed-off-by:
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Serge Semin authored
Loops-per-jiffies is a special number which represents a number of noop-loop cycles per CPU-scheduler quantum - jiffies. As you understand aside from CPU-specific implementation it depends on the CPU frequency. So when a platform has the CPU frequency fixed, we have no problem and the current udelay interface will work just fine. But as soon as CPU-freq driver is enabled and the cores frequency changes, we'll end up with distorted udelay's. In order to fix this we have to accordinly adjust the per-CPU udelay_val (the same as the global loops_per_jiffy) number. This can be done in the CPU-freq transition event handler. We subscribe to that event in the MIPS arch time-inititalization method. Co-developed-by:
Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Signed-off-by:
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Serge Semin authored
On some platforms IO-memory might require to use a proper load/store instructions (like Baikal-T1 IO-memory). To fix the cps-vec UART debug printout let's add the CONFIG_CPS_NS16550_WIDTH config to determine which instructions lb/sb, lh/sh or lw/sw are required for MMIO operations. Signed-off-by:
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Serge Semin authored
There are bit fields which persist in the MIPS CONFIG and CONFIG6 registers, but haven't been described in the generic mipsregs.h header so far. In particular, the generic CONFIG bitfields are BE - endian mode, BM - burst mode, SB - SimpleBE, OCP interface mode indicator, UDI - user-defined "CorExtend" instructions, DSP - data scratch pad RAM present, ISP - instruction scratch pad RAM present, etc. The core-specific CONFIG6 bitfields are JRCD - jump register cache prediction disable, R6 - MIPSr6 extensions enable, IFUPerfCtl - IFU performance control, SPCD - sleep state performance counter, DLSB - disable load/store bonding. A new exception code reported in the ExcCode field of the Cause register: 30 - Parity/ECC error exception happened on either fetch, load or cache refill. Lets add them to the mipsregs.h header to be used in future platform code, which have them utilized. Signed-off-by:
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Serge Semin authored
CP0 config register may indicate whether write-through merging is allowed. Currently there are two types of the merging available: SysAD Valid and Full modes. Whether each of them are supported by the core is implementation dependent. Moreover whether the ability to change the mode also depends on the chip family instance. Taking into account all of this we created a dedicated mm_config() method to detect and enable merging if it's supported. It is called for MIPS-type processors at CPU-probe stage and attempts to detect whether the write merging is available. If it's known to be supported and switchable, then switch on the full mode. Otherwise just perform the CP0.Config.MM field analysis. In addition there are platforms like InterAptiv/ProAptiv, which do have the MM bit field set by default, but having write-through cacheing unsupported makes write-merging also unsupported. In this case we just ignore the MM field value. Co-developed-by:
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Serge Semin authored
Commit 1aeba347 ("MIPS: Hardcode cpu_has_mips* where target ISA allows") updated the cpu_has_mips* macro to be replaced with a constant expression where it's possible. By mistake it wasn't done correctly for cpu_has_mips64r1/cpu_has_mips64r2 macro. They are defined to be replaced with conditional expression __isa_range_or_flag(), which means either ISA revision being within the range or the corresponding CPU options flag was set at the probe stage or both being true at the same time. But the ISA level value doesn't indicate whether the ISA is MIPS32 or MIPS64. Due to this if we select MIPS32r1 - MIPS32r5 architectures the __isa_range() macro will activate the cpu_has_mips64rX flags, which is incorrect. In order to fix the problem we make sure the 64bits CPU support is enabled by means of checking the flag cpu_has_64bits aside with proper ISA range and specific Revision flag being set. Fixes: 1aeba347 ("MIPS: Hardcode cpu_has_mips* where target ISA allows") Signed-off-by:
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Serge Semin authored
This is a MIPS32 Release 5 based IP core with XPA, EVA, dual/quad issue exec pipes, MMU with two-levels TLB, UCA, MSA, MDU core level features and system level features like up to six P5600 calculation cores, CM2 with L2 cache, IOCU/IOMMU (though might be unused depending on the system-specific IP core configuration), GIC, CPC, virtualisation module, eJTAG and PDtrace. As being MIPS32 Release 5 based core it provides all the features available by the CPU_MIPS32_R5 config, while adding a few more like UCA attribute support, availability of CPU-freq (by means of L2/CM clock ratio setting), EI/VI GIC modes detection at runtime. In addition to this if P5600 architecture is enabled modern GNU GCC provides a specific tuning for P5600 processors with respect to the classic MIPS32 Release 5. First of all branch-likely avoidance is activated only when the code is compiled with the speed optimization (avoidance is always enabled for the pure MIPS32 Release 5 architecture). Secondly the madd/msub avoidance is enabled since madd/msub utilization isn't profitable due to overhead of getting the result out of the HI/LO registers. Multiply-accumulate instructions are activated and utilized together with the necessary code reorder when multiply-add/multiply-subtract statements are met. Finally load/store bonding is activated by default. All of these optimizations may make the code relatively faster than if just MIP32 release 5 architecture was requested. Co-developed-by:
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Serge Semin authored
There are five MIPS32/64 architecture releases currently available: from 1 to 6 except fourth one, which was intentionally skipped. Three of them can be called as major: 1st, 2nd and 6th, that not only have some system level alterations, but also introduced significant core/ISA level updates. The rest of the MIPS architecture releases are minor. Even though they don't have as much ISA/system/core level changes as the major ones with respect to the previous releases, they still provide a set of updates (I'd say they were intended to be the intermediate releases before a major one) that might be useful for the kernel and user-level code, when activated by the kernel or compiler. In particular the following features were introduced or ended up being available at/after MIPS32/64 Release 5 architecture: + the last release of the misaligned memory access instructions, + virtualisation - VZ ASE - is optional component of the arch, + SIMD - MSA ASE - is optional component of the arch, + DSP ASE is optional component of the arch, + CP0.Status.FR=1 for CP1.FIR.F64=1 (pure 64-bit FPU general registers) must be available if FPU is implemented, + CP1.FIR.Has2008 support is required so CP1.FCSR.{ABS2008,NAN2008} bits are available. + UFR/UNFR aliases to access CP0.Status.FR from user-space by means of ctc1/cfc1 instructions (enabled by CP0.Config5.UFR), + CP0.COnfig5.LLB=1 and eretnc instruction are implemented to without accidentally clearing LL-bit when returning from an interrupt, exception, or error trap, + XPA feature together with extended versions of CPx registers is introduced, which needs to have mfhc0/mthc0 instructions available. So due to these changes GNU GCC provides an extended instructions set support for MIPS32/64 Release 5 by default like eretnc/mfhc0/mthc0. Even though the architecture alteration isn't that big, it still worth to be taken into account by the kernel software. Finally we can't deny that some optimization/limitations might be found in future and implemented on some level in kernel or compiler. In this case having even intermediate MIPS architecture releases support would be more than useful. So the most of the changes provided by this commit can be split into either compile- or runtime configs related. The compile-time related changes are caused by adding the new CONFIG_CPU_MIPS32_R5/CONFIG_CPU_MIPSR5 configs and concern the code activating MIPSR2 or MIPSR6 already implemented features (like eretnc/LLbit, mthc0/mfhc0). In addition CPU_HAS_MSA can be now freely enabled for MIPS32/64 release 5 based platforms as this is done for CPU_MIPS32_R6 CPUs. The runtime changes concerns the features which are handled with respect to the MIPS ISA revision detected at run-time by means of CP0.Config.{AT,AR} bits. Alas these fields can be used to detect either r1 or r2 or r6 releases. But since we know which CPUs in fact support the R5 arch, we can manually set MIPS_CPU_ISA_M32R5/MIPS_CPU_ISA_M64R5 bit of c->isa_level and then use cpu_has_mips32r5/cpu_has_mips64r5 where it's appropriate. Since XPA/EVA provide too complex alterationss and to have them used with MIPS32 Release 2 charged kernels (for compatibility with current platform configs) they are left to be setup as a separate kernel configs. Co-developed-by:
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- 21 May, 2020 2 commits
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Serge Semin authored
Indeed according to the MIPS32 Privileged Resource Architecgture the MAAR pair register address field either takes [12:31] bits for non-XPA systems and [12:55] otherwise. In any case the current address mask is just wrong for 64-bit and 32-bits XPA chips. So lets extend it to 59-bits of physical address value. This shall cover the 64-bits architecture and systems with XPA enabled, and won't cause any problem for non-XPA 32-bit systems, since address values exceeding the architecture specific MAAR mask will be just truncated with setting zeros in the unsupported upper bits. Co-developed-by:
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Tiezhu Yang authored
After commit f5ff0a28 ("[MIPS] Use generic NTP code for all MIPS platforms"), TICK_SIZE is not used in ip27-timer.c for many years, remove it. Signed-off-by:
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- 20 May, 2020 2 commits
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Paul Cercueil authored
Add missing include which adds the prototype to plat_time_init(). Fixes: f932449c ("MIPS: ingenic: Drop obsolete code, merge the rest in setup.c") Signed-off-by:
kbuild test robot <lkp@intel.com> Signed-off-by:
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Tiezhu Yang authored
After commit 0ce5ebd2 ("mfd: ioc3: Add driver for SGI IOC3 chip"), the related includes and comment about ioc3 are not used any more in ip27-timer.c, remove them. Signed-off-by:
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- 19 May, 2020 3 commits
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Serge Semin authored
When XPA mode is enabled the normally 32-bits MAAR pair registers are extended to be of 64-bits width as in pure 64-bits MIPS architecture. In this case the MAAR registers can enable the speculative loads/stores for addresses of up to 39-bits width. But in this case the process of the MAAR initialization changes a bit. The upper 32-bits of the registers are supposed to be accessed by mean of the dedicated instructions mfhc0/mthc0 and there is a CP0.MAAR.VH bit which should be set together with CP0.MAAR.VL as indication of the boundary validity. All of these peculiarities were taken into account in this commit so the speculative loads/stores would work when XPA mode is enabled. Co-developed-by:
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Zhi Li authored
The parameter "cmdline_p" is useless in bootcmdline_init()，remove it. Signed-off-by:
Zhi Li <lizhi01@loongson.cn> Signed-off-by:
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Tiezhu Yang authored
After commit 9d0aaf98 ("MIPS: SGI-IP27: Move all shared IP27 declarations to ip27-common.h"), ip27-common.h is included more than once in ip27-timer.c, remove it. Signed-off-by:
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- 18 May, 2020 2 commits
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Joshua Kinard authored
Remove an old macro that no longer exists anywhere else in the tree that snuck in when IP30 support was added Signed-off-by:
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Tiezhu Yang authored
After commit 87fcfa7b ("MIPS: Loongson64: Add generic dts"), there already exists the node and property of Loongson CPU UART0 in loongson3-package.dtsi: cpu_uart0: serial@1fe001e0 { compatible = "ns16550a"; reg = <0 0x1fe001e0 0x8>; clock-frequency = <33000000>; interrupt-parent = <&liointc>; interrupts = <10 IRQ_TYPE_LEVEL_HIGH>; no-loopback-test; }; In order to support for serial console on the Loongson platform, add CONFIG_SERIAL_OF_PLATFORM=y to loongson3_defconfig. With this patch, we can see the following boot messages: [ 1.877745] printk: console [ttyS0] disabled [ 1.881979] 1fe001e0.serial: ttyS0 at MMIO 0x1fe001e0 (irq = 16, base_baud = 2062500) is a 16550A [ 1.890838] printk: console [ttyS0] enabled And also, we can login normally from the serial console. Signed-off-by:
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- 17 May, 2020 2 commits
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Guoyun Sun authored
User space checkpoint and restart tool (CRIU) needs the page's change to be soft tracked. This allows to do a pre checkpoint and then dump only touched pages. Signed-off-by:
Guoyun Sun <sunguoyun@loongson.cn> Signed-off-by:
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WANG Xuerui authored
These are exposed to userland alternatively via the new CPUCFG instruction on Loongson-3A R4 and above. Add definitions for readback on older cores. Signed-off-by:
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