- 02 5月, 2014 1 次提交
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由 James Hogan 提交于
Implement a CPU power management callback for the r4k cache, to set up coherency again after leaving a powered down state. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
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- 01 4月, 2014 1 次提交
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由 Huacai Chen 提交于
Basic Loongson-3 CPU support include CPU probing and TLB/cache initializing. Signed-off-by: NHuacai Chen <chenhc@lemote.com> Signed-off-by: NHongliang Tao <taohl@lemote.com> Signed-off-by: NHua Yan <yanh@lemote.com> Tested-by: NAlex Smith <alex.smith@imgtec.com> Reviewed-by: NAlex Smith <alex.smith@imgtec.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/6630Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 27 3月, 2014 7 次提交
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由 Leonid Yegoshin 提交于
The M5150 core is a 32-bit MIPS RISC which implements the MIPS Architecture Release-5 in a 5-stage pipeline. In addition, it includes the MIPS Architecture Virtualization Module that enables virtualization of operating systems, which provides a scalable, trusted, and secure execution environment. Signed-off-by: NLeonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6596/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Manuel Lauss 提交于
Setting DMA_MAYBE_COHERENT gives a platform the opportunity to select use of cache ops at boot. Signed-off-by: NManuel Lauss <manuel.lauss@gmail.com> Cc: Linux-MIPS <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/6575/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Leonid Yegoshin 提交于
There is a chance for the secondary cache to have memory aliases. This can happen if the bootloader is in a non-EVA mode (or even in EVA mode but with different mapping from the kernel) and the kernel switching to EVA afterwards. It's best to flush the icache to avoid having the secondary CPUs fetching stale data from it. Signed-off-by: NLeonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>
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由 Markos Chandras 提交于
Use the userspace cache flushing functions if the interrupted process is a userspace one. Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>
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由 Leonid Yegoshin 提交于
Build EVA specific cache flushing functions (ie cachee). They will be used by a subsequent patch. Signed-off-by: NLeonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>
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由 James Hogan 提交于
Add a CPU_P5600 case to various switch statements, doing the same thing as for CPU_PROAPTIV. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Reviewed-by: NMarkos Chandras <markos.chandras@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6408/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Paul Burton 提交于
This patch introduces a new SMP implementation for systems implementing the MIPS Coherent Processing System architecture. The kernel will make use of the Coherence Manager, Cluster Power Controller & Global Interrupt Controller in order to detect, bring up & make use of other cores in the system. SMTC is not supported, so only a single TC per VPE in the system is used. That is, this option enables an SMVP style setup but across multiple cores. Signed-off-by: NPaul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6362/ Patchwork: https://patchwork.linux-mips.org/patch/6611/ Patchwork: https://patchwork.linux-mips.org/patch/6651/ Patchwork: https://patchwork.linux-mips.org/patch/6652/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 07 3月, 2014 2 次提交
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由 Steven J. Hill 提交于
The 1074K is a multiprocessing coherent processing system (CPS) based on modified 74K cores. This patch makes the 1074K an actual unique CPU type, instead of a 74K derivative, which it is not. Signed-off-by: NSteven J. Hill <Steven.Hill@imgtec.com> Reviewed-by: NLeonid Yegoshin <Leonid.Yegoshin@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6389/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Markos Chandras 提交于
The *Aptiv cores can use the CONF7/IAR bit to detect if the core has hardware support to remove instruction cache aliasing. This also defines the CONF7/AR bit in order to avoid using the '16' magic number. Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6499/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 23 1月, 2014 3 次提交
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由 Leonid Yegoshin 提交于
The interAptiv is a power-efficient multi-core microprocessor for use in system-on-chip (SoC) applications. The interAptiv combines a multi-threading pipeline with a coherence manager to deliver improved computational throughput and power efficiency. The interAptiv can contain one to four MIPS32R3 interAptiv cores, system level coherence manager with L2 cache, optional coherent I/O port, and optional floating point unit. Signed-off-by: NLeonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com> Signed-off-by: NJohn Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/6163/
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由 Leonid Yegoshin 提交于
The proAptiv Multiprocessing System is a power efficient multi-core microprocessor for use in system-on-chip (SoC) applications. The proAptiv Multiprocessing System combines a deep pipeline with multi-issue out of order execution for improved computational throughput. The proAptiv Multiprocessing System can contain one to six MIPS32r3 proAptiv cores, system level coherence manager with L2 cache, optional coherent I/O port, and optional floating point unit. Signed-off-by: NLeonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com> Signed-off-by: NJohn Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/6134/
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由 Markos Chandras 提交于
According to MIPS32 and MIPS64 PRA documents, a value of 7 in IL and DL fields is marked as "Reserved" so panic if the core uses this value in the config1 register. Also simplify the code a little bit. Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com> Signed-off-by: NJohn Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/5861/
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- 15 1月, 2014 2 次提交
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由 Aaro Koskinen 提交于
Commit 14bd8c08 ("MIPS: Loongson: Get rid of Loongson 2 #ifdefery all over arch/mips") failed to add Loongson2 specific blast_icache32 functions. Fix that. The patch fixes the following crash seen with 3.13-rc1: Reserved instruction in kernel code[#1]: [...] Call Trace: blast_icache32_page+0x8/0xb0 r4k_flush_cache_page+0x19c/0x200 do_wp_page.isra.97+0x47c/0xe08 handle_mm_fault+0x938/0x1118 __do_page_fault+0x140/0x540 resume_userspace_check+0x0/0x10 Code: 00200825 64834000 00200825 <bc900000> bc900020 bc900040 bc900060 bc900080 bc9000a0 Signed-off-by: NAaro Koskinen <aaro.koskinen@iki.fi> Reviewed-by: NAurelien Jarno <aurelien@aurel32.net> Acked-by: NJohn Crispin <blogic@openwrt.org> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Huacai Chen 提交于
Currently, Loongson-2 call protected_blast_icache_range() and others call protected_loongson23_blast_icache_range(), but I think the correct behavior should be the opposite. BTW, Loongson-3's cache-ops is compatible with MIPS64, but not compatible with Loongson-2. So, rename xxx_loongson23_yyy things to xxx_loongson2_yyy. The patch fixes early boot hang with 3.13-rc1, introduced in commit 14bd8c08 ("MIPS: Loongson: Get rid of Loongson 2 #ifdefery all over arch/mips"). Signed-off-by: NHuacai Chen <chenhc@lemote.com> Signed-off-by: NAaro Koskinen <aaro.koskinen@iki.fi> Reviewed-by: NAurelien Jarno <aurelien@aurel32.net> Acked-by: NJohn Crispin <blogic@openwrt.org> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 30 10月, 2013 1 次提交
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由 Ralf Baechle 提交于
It was ugly. Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 02 10月, 2013 1 次提交
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由 Yoichi Yuasa 提交于
[ 1.904000] BUG: scheduling while atomic: swapper/1/0x00000002 [ 1.908000] Modules linked in: [ 1.916000] CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0-rc2-lemote-los.git-5318619-dirty #1 [ 1.920000] Stack : 0000000031aac000 ffffffff810d0000 0000000000000052 ffffffff802730a4 0000000000000000 0000000000000001 ffffffff810cdf90 ffffffff810d0000 ffffffff8068b968 ffffffff806f5537 ffffffff810cdf90 980000009f0782e8 0000000000000001 ffffffff80720000 ffffffff806b0000 980000009f078000 980000009f290000 ffffffff805f312c 980000009f05b5d8 ffffffff80233518 980000009f05b5e8 ffffffff80274b7c 980000009f078000 ffffffff8068b968 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 980000009f05b520 0000000000000000 ffffffff805f2f6c 0000000000000000 ffffffff80700000 ffffffff80700000 ffffffff806fc758 ffffffff80700000 ffffffff8020be98 ffffffff806fceb0 ffffffff805f2f6c ... [ 2.028000] Call Trace: [ 2.032000] [<ffffffff8020be98>] show_stack+0x80/0x98 [ 2.036000] [<ffffffff805f2f6c>] __schedule_bug+0x44/0x6c [ 2.040000] [<ffffffff805fac58>] __schedule+0x518/0x5b0 [ 2.044000] [<ffffffff805f8a58>] schedule_timeout+0x128/0x1f0 [ 2.048000] [<ffffffff80240314>] msleep+0x3c/0x60 [ 2.052000] [<ffffffff80495400>] do_probe+0x238/0x3a8 [ 2.056000] [<ffffffff804958b0>] ide_probe_port+0x340/0x7e8 [ 2.060000] [<ffffffff80496028>] ide_host_register+0x2d0/0x7a8 [ 2.064000] [<ffffffff8049c65c>] ide_pci_init_two+0x4e4/0x790 [ 2.068000] [<ffffffff8049f9b8>] amd74xx_probe+0x148/0x2c8 [ 2.072000] [<ffffffff803f571c>] pci_device_probe+0xc4/0x130 [ 2.076000] [<ffffffff80478f60>] driver_probe_device+0x98/0x270 [ 2.080000] [<ffffffff80479298>] __driver_attach+0xe0/0xe8 [ 2.084000] [<ffffffff80476ab0>] bus_for_each_dev+0x78/0xe0 [ 2.088000] [<ffffffff80478468>] bus_add_driver+0x230/0x310 [ 2.092000] [<ffffffff80479b44>] driver_register+0x84/0x158 [ 2.096000] [<ffffffff80200504>] do_one_initcall+0x104/0x160 Signed-off-by: NYoichi Yuasa <yuasa@linux-mips.org> Reported-by: NAaro Koskinen <aaro.koskinen@iki.fi> Tested-by: NAaro Koskinen <aaro.koskinen@iki.fi> Cc: linux-mips@linux-mips.org Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org> Patchwork: https://patchwork.linux-mips.org/patch/5941/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 19 9月, 2013 2 次提交
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由 Maciej W. Rozycki 提交于
Make sure 74K revision numbers are not applied to the 1074K. Also catch invalid usage. Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5857/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Maciej W. Rozycki 提交于
Replace hardcoded CP0 PRId and CP1 FPIR register access masks throughout. The change does not touch places that use shifted or partial masks. Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5838/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 18 9月, 2013 1 次提交
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由 Ralf Baechle 提交于
o Move current_cpu_type() to a separate header file o #ifdefing on supported CPU types lets modern GCC know that certain code in callers may be discarded ideally turning current_cpu_type() into a function returning a constant. o Use current_cpu_type() rather than direct access to struct cpuinfo_mips. Signed-off-by: NRalf Baechle <ralf@linux-mips.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5833/
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- 17 9月, 2013 1 次提交
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由 Ralf Baechle 提交于
This fixes the following issue BUG: using smp_processor_id() in preemptible [00000000] code: kjournald/1761 caller is blast_dcache32+0x30/0x254 Call Trace: [<8047f02c>] dump_stack+0x8/0x34 [<802e7e40>] debug_smp_processor_id+0xe0/0xf0 [<80114d94>] blast_dcache32+0x30/0x254 [<80118484>] r4k_dma_cache_wback_inv+0x200/0x288 [<80110ff0>] mips_dma_map_sg+0x108/0x180 [<80355098>] ide_dma_prepare+0xf0/0x1b8 [<8034eaa4>] do_rw_taskfile+0x1e8/0x33c [<8035951c>] ide_do_rw_disk+0x298/0x3e4 [<8034a3c4>] do_ide_request+0x2e0/0x704 [<802bb0dc>] __blk_run_queue+0x44/0x64 [<802be000>] queue_unplugged.isra.36+0x1c/0x54 [<802beb94>] blk_flush_plug_list+0x18c/0x24c [<802bec6c>] blk_finish_plug+0x18/0x48 [<8026554c>] journal_commit_transaction+0x3b8/0x151c [<80269648>] kjournald+0xec/0x238 [<8014ac00>] kthread+0xb8/0xc0 [<8010268c>] ret_from_kernel_thread+0x14/0x1c Caches in most systems are identical - but not always, so we can't avoid the use of smp_call_function() by just looking at the boot CPU's data, have to fiddle with preemption instead. Signed-off-by: NRalf Baechle <ralf@linux-mips.org> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5835
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- 15 7月, 2013 1 次提交
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由 Paul Gortmaker 提交于
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream. The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. Note that some harmless section mismatch warnings may result, since notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c) and are flagged as __cpuinit -- so if we remove the __cpuinit from the arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit related content into no-ops as early as possible, since that will get rid of these warnings. In any case, they are temporary and harmless. Here, we remove all the MIPS __cpuinit from C code and __CPUINIT from asm files. MIPS is interesting in this respect, because there are also uasm users hiding behind their own renamed versions of the __cpuinit macros. [1] https://lkml.org/lkml/2013/5/20/589 [ralf@linux-mips.org: Folded in Paul's followup fix.] Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5494/ Patchwork: https://patchwork.linux-mips.org/patch/5495/ Patchwork: https://patchwork.linux-mips.org/patch/5509/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 08 5月, 2013 1 次提交
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由 Sanjay Lal 提交于
Signed-off-by: NSanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 02 5月, 2013 1 次提交
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由 Steven J. Hill 提交于
Some MIPS controllers have hardware I/O coherency. This patch detects those and turns off software coherency. A new kernel command line option also allows the user to manually turn software coherency on or off. Signed-off-by: NSteven J. Hill <Steven.Hill@imgtec.com>
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- 05 4月, 2013 1 次提交
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由 Deng-Cheng Zhu 提交于
The commit a96102be introduced set_isa() where compatible ISA info is also set aside from the one gets passed in. It means, for example, 1004K will have MIPS_CPU_ISA_M32R2/M32R1/II/I flags. This leads to things like the following inappropriate: if (c->isa_level == MIPS_CPU_ISA_M32R1 || c->isa_level == MIPS_CPU_ISA_M32R2 || c->isa_level == MIPS_CPU_ISA_M64R1 || c->isa_level == MIPS_CPU_ISA_M64R2) This patch fixes it. Signed-off-by: NDeng-Cheng Zhu <dengcheng.zhu@imgtec.com> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 17 2月, 2013 1 次提交
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由 Steven J. Hill 提交于
Signed-off-by: NSteven J. Hill <sjhill@mips.com> Patchwork: http://patchwork.linux-mips.org/patch/4682/Signed-off-by: NJohn Crispin <blogic@openwrt.org>
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- 01 2月, 2013 1 次提交
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由 Ralf Baechle 提交于
Having received another series of whitespace patches I decided to do this once and for all rather than dealing with this kind of patches trickling in forever. Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 14 12月, 2012 2 次提交
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由 Ralf Baechle 提交于
Nobody seems to be interested anymore and upstream also never had an ethernet driver. Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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由 Ralf Baechle 提交于
Normally r4k_dma_cache_inv should only ever be called with cacheline aligned addresses. If however, it isn't there is the theoretical possibility of data corruption. There is no correct way of handling this and anyway, it should only happen if the DMA API is used incorrectly so drop There is a different corruption scenario with these CACHE instructions removed but again there is no way of handling this correctly and it can be triggered only through incorrect use of the DMA API. So just get rid of the complexity. Signed-off-by: NRalf Baechle <ralf@linux-mips.org> Reported-by: NJames Rodriguez <jamesr@juniper.net>
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- 09 11月, 2012 1 次提交
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由 Shane McDonald 提交于
Commit 97ce2c88 (jump-label: initialize jump-label subsystem much earlier) caused MIPS to break, so this was resolved with commit 6650df3c (MIPS: Move cache setup to setup_arch().). Unfortunately, after this commit, the coherency kernel parameters, cca and coherentio, are no longer processed before their values are used. This patch fixes this problem by marking them as early_param, which results in them being processed before they are needed. Signed-off-by: NShane McDonald <mcdonald.shane@gmail.com> Acked-by: NDavid Daney <david.daney@cavium.com> Cc: Ralf Baechle <ralf@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/3961Signed-off-by: NJohn Crispin <blogic@openwrt.org>
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- 14 9月, 2012 1 次提交
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由 Steven J. Hill 提交于
Signed-off-by: NSteven J. Hill <sjhill@mips.com>
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- 19 7月, 2012 1 次提交
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由 Douglas Leung 提交于
This affects certain 4Kc cores. Signed-off-by: NDouglas Leung <douglas@mips.com> Signed-off-by: NSteven J. Hill <sjhill@mips.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3855/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 07 7月, 2012 1 次提交
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由 Steven J. Hill 提交于
[ralf@linux-mips.org: Fixed whitespace damage.] Signed-off-by: NSteven J. Hill <sjhill@mips.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3773/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 17 5月, 2012 1 次提交
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由 David Daney 提交于
Signed-off-by: NDavid Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3821/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 29 3月, 2012 1 次提交
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由 David Howells 提交于
Disintegrate asm/system.h for MIPS. Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: NRalf Baechle <ralf@linux-mips.org> cc: linux-mips@linux-mips.org
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- 20 3月, 2012 1 次提交
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由 Cong Wang 提交于
Signed-off-by: NCong Wang <amwang@redhat.com>
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- 08 12月, 2011 1 次提交
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由 Jayachandran C 提交于
Add support for Netlogic's XLP MIPS SoC. This patch adds: * XLP processor ID in cpu_probe.c and asm/cpu.h * XLP case to asm/module.h * CPU_XLP case to mm/tlbex.c * minor change to r4k cache handling to ignore XLP secondary cache * XLP cpu overrides to mach-netlogic/cpu-feature-overrides.h Signed-off-by: NJayachandran C <jayachandranc@netlogicmicro.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2966/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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- 20 10月, 2011 1 次提交
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由 Ralf Baechle 提交于
Until now flush_kernel_vmap_range() and invalidate_kernel_vmap_range() did not exist on MIPS resulting in heavy cache corruption on XFS filesystems. Left for the post-3.0 time: optimization and make this work with highmem, too. Since the combination of highmem + cache aliases atm doesn't work this isn't a regression. Signed-off-by: NRalf Baechle <ralf@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/2505/
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- 26 7月, 2011 1 次提交
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由 Kevin Cernekee 提交于
On processors with deep write buffers, it is likely that many cycles will pass between a CACHE instruction and the time the data actually gets written out to DRAM. Add a SYNC instruction to ensure that the buffers get emptied before the flush functions return. Actual problem seen in the wild: 1) dma_alloc_coherent() allocates cached memory 2) memset() is called to clear the new pages 3) dma_cache_wback_inv() is called to flush the zero data out to memory 4) dma_alloc_coherent() returns an uncached (kseg1) pointer to the freshly allocated pages 5) Caller writes data through the kseg1 pointer 6) Buffered writeback data finally gets flushed out to DRAM 7) Part of caller's data is inexplicably zeroed out This patch adds SYNC between steps 3 and 4, which fixed the problem. Signed-off-by: NKevin Cernekee <cernekee@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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