- 01 Aug, 2016 40 commits
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Anshuman Khandual authored
This patch enables support for TM checkpointed VSX register set ELF core note NT_PPC_CVSX based ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved through adding a register set REGSET_CVSX in powerpc corresponding to the ELF core note section added. It implements the get, set and active functions for this new register set added. Signed-off-by:
Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by:
Simon Guo <wei.guo.simon@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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Anshuman Khandual authored
This patch enables support for TM checkpointed VMX register set ELF core note NT_PPC_CVMX based ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved through adding a register set REGSET_CVMX in powerpc corresponding to the ELF core note section added. It implements the get, set and active functions for this new register set added. Signed-off-by:
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Anshuman Khandual authored
This patch enables support for TM checkpointed FPR register set ELF core note NT_PPC_CFPR based ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved through adding a register set REGSET_CFPR in powerpc corresponding to the ELF core note section added. It implements the get, set and active functions for this new register set added. Signed-off-by:
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Anshuman Khandual authored
This patch enables support for TM checkpointed GPR register set ELF core note NT_PPC_CGPR based ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved through adding a register set REGSET_CGPR in powerpc corresponding to the ELF core note section added. It implements the get, set and active functions for this new register set added. Signed-off-by:
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Anshuman Khandual authored
This patch splits gpr32_get, gpr32_set functions to accommodate in transaction ptrace requests implemented in patches later in the series. Signed-off-by:
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Anshuman Khandual authored
This patch enables in transaction NT_PPC_VSX ptrace requests. The function vsr_get which gets the running value of all VSX registers and the function vsr_set which sets the running value of of all VSX registers work on the running set of VMX registers whose location will be different if transaction is active. This patch makes these functions adapt to situations when the transaction is active. Signed-off-by:
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Anshuman Khandual authored
This patch enables in transaction NT_PPC_VMX ptrace requests. The function vr_get which gets the running value of all VMX registers and the function vr_set which sets the running value of of all VMX registers work on the running set of VMX registers whose location will be different if transaction is active. This patch makes these functions adapt to situations when the transaction is active. Signed-off-by:
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Anshuman Khandual authored
This patch enables in transaction NT_PRFPREG ptrace requests. The function fpr_get which gets the running value of all FPR registers and the function fpr_set which sets the running value of of all FPR registers work on the running set of FPR registers whose location will be different if transaction is active. This patch makes these functions adapt to situations when the transaction is active. Signed-off-by:
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Anshuman Khandual authored
This patch creates a function flush_tmregs_to_thread which will then be used by subsequent patches in this series. The function checks for self tracing ptrace interface attempts while in the TM context and logs appropriate warning message. Signed-off-by:
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Anshuman Khandual authored
This patch adds twelve ELF core note sections for powerpc architecture for various registers and register sets which need to be accessed from ptrace interface and then gdb. These additions include special purpose registers like TAR, PPR, DSCR, TM running and checkpointed state for various register sets, EBB related register set, performance monitor register set etc. Addition of these new ELF core note sections extends the existing ELF ABI on powerpc arch without affecting it in any manner. Signed-off-by:
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Aneesh Kumar K.V authored
This should be same as flush_tlb_page except for hash32. For hash32 I guess the existing code is wrong, because we don't seem to be flushing tlb for Hash != 0 case at all. Fix this by switching to calling flush_tlb_page() which does the right thing by flushing tlb for both hash and nohash case with hash32 Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
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Aneesh Kumar K.V authored
Some archs like ppc64 need to do special things when flushing tlb for hugepage. Add a new helper to flush hugetlb tlb range. This helps us to avoid flushing the entire tlb mapping for the pid. Signed-off-by:
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Aneesh Kumar K.V authored
Use the helper instead of open coding the same at multiple place Signed-off-by:
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Aneesh Kumar K.V authored
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Aneesh Kumar K.V authored
Instead of flushing the entire mm, implement a flush_pmd_tlb_range Signed-off-by:
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Aneesh Kumar K.V authored
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Aneesh Kumar K.V authored
Use flush_hugetlb_page instead of flush_tlb_page when we clear flush the pte. Signed-off-by:
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Aneesh Kumar K.V authored
Replace opencoding of the same at multiple places with the helper. No functional change with this patch. Signed-off-by:
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Aneesh Kumar K.V authored
Now that we track page size in mmu_gather, we can use address based tlbie format when doing a tlb_flush(). We don't do this if we are invalidating the full address space. Signed-off-by:
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Michael Ellerman authored
Add a comment to the generated assembler for jump labels. This makes it easier to identify them in asm listings (generated with $ make foo.s). Signed-off-by: -
Aneesh Kumar K.V authored
This allows us to catch incorrect usage of cpu_has_feature() and mmu_has_feature() prior to jump labels being initialised. mpe: Use printk() and dump_stack() rather than WARN_ON(), because WARN_ON() may not work this early in boot. Rename the Kconfig. Signed-off-by:
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Kevin Hao authored
As we just did for CPU features. Signed-off-by:
Kevin Hao <haokexin@gmail.com> Signed-off-by:
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Kevin Hao authored
We do binary patching of asm code using CPU features, which is a one-time operation, done during early boot. However checks of CPU features in C code are currently done at run time, even though the set of CPU features can never change after boot. We can optimise this by using jump labels to implement cpu_has_feature(), meaning checks in C code are binary patched into a single nop or branch. For a C sequence along the lines of: if (cpu_has_feature(FOO)) return 2; The generated code before is roughly: ld r9,-27640(r2) ld r9,0(r9) lwz r9,32(r9) cmpwi cr7,r9,0 bge cr7, 1f li r3,2 blr 1: ... After (true): nop li r3,2 blr After (false): b 1f li r3,2 blr 1: ... mpe: Rename MAX_CPU_FEATURES as we already have a #define with that name, and define it simply as a constant, rather than doing tricks with sizeof and NULL pointers. Rename the array to cpu_feature_keys. Use the kconfig we added to guard it. Add BUILD_BUG_ON() if the feature is not a compile time constant. Rewrite the change log. Signed-off-by: -
Michael Ellerman authored
Add a kconfig option to control whether we use jump label for the cpu/mmu_has_feature() checks. Currently this does nothing, but we will enabled it in the subsequent patches. Signed-off-by: -
Kevin Hao authored
We plan to use jump label for cpu_has_feature(). In order to implement this we need to include the linux/jump_label.h in asm/cputable.h. Unfortunately if we do that it leads to an include loop. The root of the problem seems to be that reg.h needs cputable.h (for CPU_FTRs), and then cputable.h via jump_label.h eventually pulls in hw_irq.h which needs reg.h (for MSR_EE). So move cpu_has_feature() to a separate file on its own. Signed-off-by:
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Kevin Hao authored
This function is only used by get_vtb(). They are almost the same except the reading from the real register. Move the mfspr() to get_vtb() and kill the function mfvtb(). With this, we can eliminate the use of cpu_has_feature() in very core header file like reg.h. This is a preparation for the use of jump label for cpu_has_feature(). Signed-off-by:
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Aneesh Kumar K.V authored
Call jump_label_init() early so that we can use static keys for CPU and MMU feature checks. Signed-off-by:
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Kevin Hao authored
Some arches (powerpc at least) would like to invoke jump_label_init() much earlier in boot. So check static_key_initialized in order to make sure this function runs only once. LGTM-by: Ingo (http://marc.info/?l=linux-kernel&m=144049104329961&w=2) Signed-off-by:
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Aneesh Kumar K.V authored
This switches early feature checks to use the non static key variant of the function. In later patches we will be switching cpu_has_feature() and mmu_has_feature() to use static keys and we can use them only after static key/jump label is initialized. Any check for feature before jump label init should be done using this new helper. Signed-off-by:
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Michael Ellerman authored
In later patches, we will be switching CPU and MMU feature checks to use static keys. For checks in early boot before jump label is initialized we need a variant of [cpu|mmu]_has_feature() that doesn't use jump labels. So create those called, unimaginatively, early_[cpu|mmu]_has_feature(). Signed-off-by:
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Michael Ellerman authored
Currently we have radix_enabled() three times, twice in asm/book3s/64/mmu.h and then a fallback in asm/mmu.h. Consolidate them in asm/mmu.h. While we're at it convert them to be static inlines, and change the fallback case to returning a bool, like mmu_has_feature(). Signed-off-by: -
Michael Ellerman authored
The intention is that the result is only used as a boolean, so enforce that by changing the return type to bool. Signed-off-by: -
Michael Ellerman authored
The intention is that the result is only used as a boolean, so enforce that by changing the return type to bool. Signed-off-by: -
Aneesh Kumar K.V authored
MMU feature bits are defined such that we use the lower half to present MMU family features. Remove the strict split of half and also move Radix to a mmu family feature. Radix introduce a new MMU model and strictly speaking it is a new MMU family. This also free up bits which can be used for individual features later. Signed-off-by:
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Michael Ellerman authored
Early in boot we binary patch some sections of code based on the CPU and MMU feature bits. But it is a one-time patching, there is no facility for repatching the code later if the set of features change. It is a major bug if the set of features changes after we've done the code patching - so add a check for it. Signed-off-by: -
Michael Ellerman authored
Up until now we needed to do the MMU init before feature patching, because part of the MMU init was scanning the device tree and setting and/or clearing some MMU feature bits. Now that we have split that MMU feature modification out into routines called from early_init_devtree() (called earlier) we can now do feature patching before calling MMU init. The advantage of this is it means the remainder of the MMU init runs with the final set of features which will apply for the rest of the life of the system. This means we don't have to special case anything called from MMU init to deal with a changing set of feature bits. Signed-off-by: -
Michael Ellerman authored
Like we just did for hash, split the device tree scanning parts out and call them from mmu_early_init_devtree(). Signed-off-by: -
Michael Ellerman authored
Currently MMU initialisation (early_init_mmu()) consists of a mixture of scanning the device tree, setting MMU feature bits, and then also doing actual initialisation of MMU data structures. We'd like to decouple the setting of the MMU features from the actual setup. So split out the device tree scanning, and associated code, and call it from mmu_init_early_devtree(). Signed-off-by: -
Michael Ellerman authored
Move the handling of the disable_radix command line argument into the newly created mmu_early_init_devtree(). It's an MMU option so it's preferable to have it in an mm related file, and it also means platforms that don't support radix don't have to carry the code. Signed-off-by: -
Michael Ellerman authored
Empty for now, but we'll add to it in the next patch. Signed-off-by:
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