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2020-12-04powerpc/pseries: Define PCI bus speed for Gen4 and Gen5Frederic Barrat1-30/+21
Update bus speed definition for PCI Gen4 and 5. Signed-off-by: Frederic Barrat <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-04powerpc: Allow relative pointers in bug table entriesJordan Niethe3-6/+10
This enables GENERIC_BUG_RELATIVE_POINTERS on Power so that 32-bit offsets are stored in the bug entries rather than 64-bit pointers. While this doesn't save space for 32-bit machines, use it anyway so there is only one code path. Signed-off-by: Jordan Niethe <[email protected]> Reviewed-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-04powerpc/xmon: Fix build failure for 8xxRavi Bangoria1-0/+2
With CONFIG_PPC_8xx and CONFIG_XMON set, kernel build fails with arch/powerpc/xmon/xmon.c:1379:12: error: 'find_free_data_bpt' defined but not used [-Werror=unused-function] Fix it by enclosing find_free_data_bpt() inside #ifndef CONFIG_PPC_8xx. Fixes: 30df74d67d48 ("powerpc/watchpoint/xmon: Support 2nd DAWR") Reported-by: kernel test robot <[email protected]> Signed-off-by: Ravi Bangoria <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-04powerpc: Use common STABS_DEBUG and DWARF_DEBUG and ELF_DETAILS macroYouling Tang2-76/+8
Use the common STABS_DEBUG and DWARF_DEBUG and ELF_DETAILS macro rule for the linker script in an effort. Signed-off-by: Youling Tang <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-04powerpc/64: Fix an EMIT_BUG_ENTRY in head_64.SJordan Niethe1-1/+1
Commit 63ce271b5e37 ("powerpc/prom: convert PROM_BUG() to standard trap") added an EMIT_BUG_ENTRY for the trap after the branch to start_kernel(). The EMIT_BUG_ENTRY was for the address "0b", however the trap was not labeled with "0". Hence the address used for bug is in relative_toc() where the previous "0" label is. Label the trap as "0" so the correct address is used. Fixes: 63ce271b5e37 ("powerpc/prom: convert PROM_BUG() to standard trap") Signed-off-by: Jordan Niethe <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-04powerpc/vdso: Cleanup vdso.hChristophe Leroy1-7/+3
Rename the guard define to _ASM_POWERPC_VDSO_H And remove useless #ifdef __KERNEL__ Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/9902590d410cd1c2afa48b83b277faf0711f07b2.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove VDSO32_LBASE and VDSO64_LBASEChristophe Leroy3-6/+2
VDSO32_LBASE and VDSO64_LBASE are 0. Remove them to simplify code. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/6c4d6570d886bbe1cc471e8ca01602e4b4d9beb5.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove DBG()Christophe Leroy1-8/+0
DBG() is not used anymore. Remove it. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/e11a9b50e709f197bb3aa2ed1d80d2dee8714afc.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso_readyChristophe Leroy1-6/+0
There is no way to get out of vdso_init() prematuraly anymore. Remove vdso_ready as it will always be 1. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/0e1e18c6329b848aa3edeeba76509b4d76182e7d.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso_setup()Christophe Leroy1-19/+2
vdso_fixup_features() cannot fail anymore and that's the only function called by vdso_setup(). vdso_setup() has become trivial and can be removed. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/11522eec6140f510a8c89c63cbb739277d097fdc.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove lib32_elfinfo and lib64_elfinfoChristophe Leroy1-27/+2
lib32_elfinfo and lib64_elfinfo are not used anymore, remove them. Also remove vdso32_kbase and vdso64_kbase while removing the last use. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/01ac65abf22f0428f8f764525a7d84459c54d806.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove symbol section information in struct lib32/64_elfinfoChristophe Leroy1-90/+0
The members related to the symbol section in struct lib32_elfinfo and struct lib64_elfinfo are not used anymore, removed them. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/b779e5b7cc0354e2f87fd407fe5b02f4a8a73825.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove unused text member in struct lib32/64_elfinfoChristophe Leroy1-16/+0
The text member in struct lib32_elfinfo and struct lib64_elfinfo is not used, remove it. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/f53dcc9bb1946a7854d15b34d03d3d2e2003848c.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso_patches[] and associated functionsChristophe Leroy1-161/+0
vdso_patches[] is now empty, remove it and remove all functions that depends on it. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/27d75debd6e4ddeaffe1d66ffed1e7526684a004.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove runtime generated sigtramp offsetsChristophe Leroy2-64/+0
Signal trampoline offsets are now generated at buildtime. Runtime generated offsets are not used anymore, remove them. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/7c192d35a437151837cf4c48aeccb42380d6daac.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove __kernel_datapage_offsetChristophe Leroy5-55/+0
__kernel_datapage_offset is not used anymore, remove it. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/ddb5c746bec4e1a026d7c85243213a1876ef844f.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso32_pages and vdso64_pagesChristophe Leroy1-16/+0
vdso32_pages and vdso64_pages are not used anymore. Remove them. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/bce021f616cbaf39dfb5766cf7ef114adcb918d9.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Merge __kernel_sync_dicache_p5() into __kernel_sync_dicache()Christophe Leroy5-27/+12
__kernel_sync_dicache_p5() is an alternative to __kernel_sync_dicache() when cpu has CPU_FTR_COHERENT_ICACHE Remove this alternative function and merge __kernel_sync_dicache_p5() into __kernel_sync_dicache() using standard CPU feature fixup. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/4c7dcc6544882761b2b0249d7a8ec2c3a8088cb5.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Use builtin symbols to locate fixup sectionChristophe Leroy3-41/+30
Add builtin symbols to locate fixup section and use them instead of locating sections through elf headers at runtime. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/2954526981859ca1ccfcfc7a7c4263920e9ddfcb.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Retrieve sigtramp offsets at buildtimeChristophe Leroy12-12/+98
This is copied from arm64. Instead of using runtime generated signal trampoline offsets, get offsets at buildtime. If the said trampoline doesn't exist, build will fail. So no need to check whether the trampoline exists or not in the VDSO. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/f8bfd6812c3e3678b1cdb4d55a52f9eb022b40d3.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove unused \tmp param in __get_datapage()Christophe Leroy6-9/+9
The \tmp param is not used anymore, remove it. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/4b13f897dcccce8ae03c031a4598cf26b32e2f1c.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Simplify __get_datapage()Christophe Leroy3-3/+9
The VDSO datapage and the text pages are always located immediately next to each other, so it can be hardcoded without an indirection through __kernel_datapage_offset Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/b08f5ef99d64cfc38f79b7ad5310d9b4d2479eeb.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Move vdso datapage up frontChristophe Leroy2-8/+8
Move the vdso datapage in front of the VDSO area, before vdso test. This will allow to remove the __kernel_datapage_offset symbol and simplify __get_datapage() in following patches. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/b68c99b6e8ee0b1d99bfa4c7e34c359fc1bc1000.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Replace vdso_base by vdsoChristophe Leroy13-25/+27
All other architectures but s390 use a void pointer named 'vdso' to reference the VDSO mapping. In a following patch, the VDSO data page will be put in front of text, vdso_base will then not anymore point to VDSO text. To avoid confusion between vdso_base and VDSO text, rename vdso_base into vdso and make it a void __user *. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/8e6cefe474aa4ceba028abb729485cd46c140990.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Provide vdso_remap()Christophe Leroy2-25/+24
Provide vdso_remap() through _install_special_mapping() and drop arch_remap(). This adds a test of the size and returns -EINVAL if the size is not correct. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/373c66f768fa9cc8890f3b55462209a98c522326.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Move to _install_special_mapping() and remove arch_vma_name()Christophe Leroy1-23/+19
Copied from commit 2fea7f6c98f5 ("arm64: vdso: move to _install_special_mapping and remove arch_vma_name"). Use the new _install_special_mapping() API added by commit a62c34bd2a8a ("x86, mm: Improve _install_special_mapping and fix x86 vdso naming") which obsolete install_special_mapping(). And remove arch_vma_name() as the name is handled by the new API. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: kernel test robot <[email protected]> [mpe: Squash fix to use PTR_ERR_OR_ZERO() from lkp] Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/e7e5dfe0f93234e31051f2a610b4b07f50b0082f.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Simplify arch_setup_additional_pages() exitChristophe Leroy1-19/+21
To simplify arch_setup_additional_pages() exit, rename it __arch_setup_additional_pages() and create a caller arch_setup_additional_pages() which does the locking. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/603c1d039d3f928ee95e547fcd2219fcf4c3b514.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Use VDSO size in arch_setup_additional_pages()Christophe Leroy1-12/+6
In arch_setup_additional_pages(), instead of using number of VDSO pages and recalculate VDSO size, directly use the VDSO size. As vdso_ready is set, vdso_pages can't be 0 so just remove the test. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/4edfa548c3885a430b765335dc720105716e273f.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove unnecessary ifdefs in vdso_pagelist initializationChristophe Leroy1-25/+6
No need of all those #ifdefs around the pagelist initialisation, use IS_ENABLED(), GCC will kick out unused static variables. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/f9333432e329b1fcbbbf846cb1cd4a1c4127a60b.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Refactor 32 bits and 64 bits pages setupChristophe Leroy1-20/+19
The setup of VDSO pages is identical for 32 bits VDSO and 64 bits VDSO. Refactor that setup. And use &vdsoXX_start which is synonym of vdsoXX_kbase. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/269ffb54c37fc1d46128f77d7a39f88ef4a9957d.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove NULL termination element in vdso_pagelistChristophe Leroy1-4/+2
No need of a NULL last element in pagelists, install_special_mapping() knows how long the list is. Remove that element. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/e58d95ab859e3cbc9bae3c9ce2959e17d2864f5d.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove get_page() in vdso_pagelist initializationChristophe Leroy1-4/+2
Partly copied from commit 16fb1a9bec61 ("arm64: vdso: clean up vdso_pagelist initialization"). No need to get_page() the vdso text/data - these are part of the kernel image. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/9d14540bd10832b6c9519d74fb5728fdc4974b36.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Rename syscall_map_32/64 to simplify vdso_setup_syscall_map()Christophe Leroy3-15/+10
Today vdso_data structure has: - syscall_map_32[] and syscall_map_64[] on PPC64 - syscall_map_32[] on PPC32 On PPC32, syscall_map_32[] is populated using sys_call_table[]. On PPC64, syscall_map_64[] is populated using sys_call_table[] and syscal_map_32[] is populated using compat_sys_call_table[]. To simplify vdso_setup_syscall_map(), - On PPC32 rename syscall_map_32[] into syscall_map[], - On PPC64 rename syscall_map_64[] into syscall_map[], - On PPC64 rename syscall_map_32[] into compat_syscall_map[]. That way, syscall_map[] gets populated using sys_call_table[] and compat_syscall_map[] gets population using compat_sys_call_table[]. Also define an empty compat_syscall_map[] on PPC32 to avoid ifdefs. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/472734be0d9991eee320a06824219a5b2663736b.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Add missing includes and clean vdso_setup_syscall_map()Christophe Leroy1-12/+5
Instead of including extern references locally in vdso_setup_syscall_map(), add the missing headers. sys_ni_syscall() being a function, cast its address to an unsigned long instead of declaring it as a fake unsigned long object. At the same time, remove a comment which paraphrases the function name. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/b4afedce748ed2858299ceab5ae29b52109263ef.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Stripped VDSO is not needed, don't build itChristophe Leroy3-43/+4
Since commit 24b659a13866 ("powerpc: Use unstripped VDSO image for more accurate profiling data"), only the unstripped VDSO image has been used. Partially revert commit 8150caad0226 ("[POWERPC] powerpc vDSO: install unstripped copies on disk") to avoid building the stripped version. And the unstripped version in $(MODLIB)/vdso/ is not required anymore as it is the one embedded in the kernel image. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/5986ca25be44fe6e9790486304507f240077d8c4.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Transform save_user_regs() and save_tm_user_regs() in ↵Christophe Leroy1-113/+111
'unsafe' version Change those two functions to be used within a user access block. For that, change save_general_regs() to and unsafe_save_general_regs(), then replace all user accesses by unsafe_ versions. This series leads to a reduction from 2.55s to 1.73s of the system CPU time with the following microbench app on an mpc832x with KUAP (approx 32%) Without KUAP, the difference is in the noise. void sigusr1(int sig) { } int main(int argc, char **argv) { int i = 100000; signal(SIGUSR1, sigusr1); for (;i--;) raise(SIGUSR1); exit(0); } An additional 0.10s reduction is achieved by removing CONFIG_PPC_FPU, as the mpc832x has no FPU. A bit less spectacular on an 8xx as KUAP is less heavy, prior to the series (with KUAP) it ran in 8.10 ms. Once applies the removal of FPU regs handling, we get 7.05s. With the full series, we get 6.9s. If artificially re-activating FPU regs handling with the full series, we get 7.6s. So for the 8xx, the removal of the FPU regs copy is what makes the difference, but the rework of handle_signal also have a benefit. Same as above, without KUAP the difference is in the noise. Signed-off-by: Christophe Leroy <[email protected]> [mpe: Fixup typo in SPE handling] Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/c7b37b385ccf9666066452e58f018a86573f83e8.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Isolate non-copy actions in save_user_regs() and ↵Christophe Leroy1-13/+41
save_tm_user_regs() Reorder actions in save_user_regs() and save_tm_user_regs() to regroup copies together in order to switch to user_access_begin() logic in a later patch. Move non-copy actions into new functions called prepare_save_user_regs() and prepare_save_tm_user_regs(). Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/f6eac65781b4a57220477c8864bca2b57f29a5d5.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal: Create 'unsafe' versions of copy_[ck][fpr/vsx]_to_user()Christophe Leroy1-0/+53
For the non VSX version, that's trivial. Just use unsafe_copy_to_user() instead of __copy_to_user(). For the VSX version, remove the intermediate step through a buffer and use unsafe_put_user() directly. This generates a far smaller code which is acceptable to inline, see below: Standard VSX version: 0000000000000000 <.copy_fpr_to_user>: 0: 7c 08 02 a6 mflr r0 4: fb e1 ff f8 std r31,-8(r1) 8: 39 00 00 20 li r8,32 c: 39 24 0b 80 addi r9,r4,2944 10: 7d 09 03 a6 mtctr r8 14: f8 01 00 10 std r0,16(r1) 18: f8 21 fe 71 stdu r1,-400(r1) 1c: 39 41 00 68 addi r10,r1,104 20: e9 09 00 00 ld r8,0(r9) 24: 39 4a 00 08 addi r10,r10,8 28: 39 29 00 10 addi r9,r9,16 2c: f9 0a 00 00 std r8,0(r10) 30: 42 00 ff f0 bdnz 20 <.copy_fpr_to_user+0x20> 34: e9 24 0d 80 ld r9,3456(r4) 38: 3d 42 00 00 addis r10,r2,0 3a: R_PPC64_TOC16_HA .toc 3c: eb ea 00 00 ld r31,0(r10) 3e: R_PPC64_TOC16_LO_DS .toc 40: f9 21 01 70 std r9,368(r1) 44: e9 3f 00 00 ld r9,0(r31) 48: 81 29 00 20 lwz r9,32(r9) 4c: 2f 89 00 00 cmpwi cr7,r9,0 50: 40 9c 00 18 bge cr7,68 <.copy_fpr_to_user+0x68> 54: 4c 00 01 2c isync 58: 3d 20 40 00 lis r9,16384 5c: 79 29 07 c6 rldicr r9,r9,32,31 60: 7d 3d 03 a6 mtspr 29,r9 64: 4c 00 01 2c isync 68: 38 a0 01 08 li r5,264 6c: 38 81 00 70 addi r4,r1,112 70: 48 00 00 01 bl 70 <.copy_fpr_to_user+0x70> 70: R_PPC64_REL24 .__copy_tofrom_user 74: 60 00 00 00 nop 78: e9 3f 00 00 ld r9,0(r31) 7c: 81 29 00 20 lwz r9,32(r9) 80: 2f 89 00 00 cmpwi cr7,r9,0 84: 40 9c 00 18 bge cr7,9c <.copy_fpr_to_user+0x9c> 88: 4c 00 01 2c isync 8c: 39 20 ff ff li r9,-1 90: 79 29 00 44 rldicr r9,r9,0,1 94: 7d 3d 03 a6 mtspr 29,r9 98: 4c 00 01 2c isync 9c: 38 21 01 90 addi r1,r1,400 a0: e8 01 00 10 ld r0,16(r1) a4: eb e1 ff f8 ld r31,-8(r1) a8: 7c 08 03 a6 mtlr r0 ac: 4e 80 00 20 blr 'unsafe' simulated VSX version (The ... are only nops) using unsafe_copy_fpr_to_user() macro: unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task) { unsafe_copy_fpr_to_user(to, task, failed); return 0; failed: return 1; } 0000000000000000 <.copy_fpr_to_user>: 0: 39 00 00 20 li r8,32 4: 39 44 0b 80 addi r10,r4,2944 8: 7d 09 03 a6 mtctr r8 c: 7c 69 1b 78 mr r9,r3 ... 20: e9 0a 00 00 ld r8,0(r10) 24: f9 09 00 00 std r8,0(r9) 28: 39 4a 00 10 addi r10,r10,16 2c: 39 29 00 08 addi r9,r9,8 30: 42 00 ff f0 bdnz 20 <.copy_fpr_to_user+0x20> 34: e9 24 0d 80 ld r9,3456(r4) 38: f9 23 01 00 std r9,256(r3) 3c: 38 60 00 00 li r3,0 40: 4e 80 00 20 blr ... 50: 38 60 00 01 li r3,1 54: 4e 80 00 20 blr Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/29f6c4b8e7a5bbc61e6a8801b78bbf493f9f819e.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Switch swap_context() to user_access_begin() logicChristophe Leroy1-14/+10
As this was the last user of put_sigset_t(), remove it as well. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/c3ac4f2d134a3391bb51bdaa2d00e9a409aba9f8.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Add and use unsafe_put_sigset_t()Christophe Leroy1-2/+11
put_sigset_t() calls copy_to_user() for copying two words. This is terribly inefficient for copying two words. By switching to unsafe_put_user(), we end up with something as simple as: 3cc: 81 3d 00 00 lwz r9,0(r29) 3d0: 91 26 00 b4 stw r9,180(r6) 3d4: 81 3d 00 04 lwz r9,4(r29) 3d8: 91 26 00 b8 stw r9,184(r6) Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/06def97e87ac1c4ae8e3197e0982e1fab7b3c8ae.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Remove ifdefery in middle of if/elseChristophe Leroy1-14/+8
MSR_TM_ACTIVE() is always defined and returns always 0 when CONFIG_PPC_TRANSACTIONAL_MEM is not selected, so the awful ifdefery in the middle of an if/else can be removed. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/f3c36d687e4228f58d5c207a4036aa9ddcc7420a.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Switch handle_rt_signal32() to user_access_begin() logicChristophe Leroy1-21/+34
On the same way as handle_signal32(), replace all user accesses with equivalent unsafe_ versions, and move the trampoline code icache flush outside the user access block. Functions that have no unsafe_ equivalent also remains outside the access block. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/2974314226256f958e2984912b48883ef1754185.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Switch handle_signal32() to user_access_begin() logicChristophe Leroy1-13/+16
Replace the access_ok() by user_access_begin() and change all user accesses to unsafe_ version. Move flush_icache_range() outside the user access block. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/a27797f781aa00da96f8284c898173d18e952361.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Move signal trampoline setup to handle_[rt_]signal32Christophe Leroy1-39/+22
Move signal trampoline setup into handle_signal32() and handle_rt_signal32(). At the same time, remove the define which hides the mc_pad field used for trampoline. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/e439cc0fa35aa45da6776520777a61848b92fd4b.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Misc changes to make handle_[rt_]_signal32() more similarChristophe Leroy1-10/+14
Miscellaneous changes to clean and make handle_signal32() and handle_rt_signal32() even more similar. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/df0bc8c3b8fa96390c46f611df79b2a94ac21844.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Rename local pointers in handle_rt_signal32()Christophe Leroy1-26/+25
Rename pointers in handle_rt_signal32() to make it more similar to handle_signal32() tm_frame becomes tm_mctx frame becomes mctx rt_sf becomes frame Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/be77477b0f05397876015b218e36548ee8f5e10b.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Move handle_signal32() close to handle_rt_signal32()Christophe Leroy1-85/+85
Those two functions are similar and serving the same purpose. To ease refactorisation, move them close to each other. This is pure move, no code change, no cosmetic. Yes, checkpatch is not happy, most will clear later. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/dbce67900bf566bcf40179467bf1eb500814c405.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal32: Simplify logging in handle_rt_signal32()Christophe Leroy1-5/+1
If something is bad in the frame, there is no point in knowing which part of the frame exactly is wrong as it got allocated as a single block. Always print the root address of the frame in case of failed user access, just like handle_signal32(). Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/691895bd31fee89a2d8370befd66ad4eff5b63f2.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal: Refactor bad frame loggingChristophe Leroy4-43/+21
The logging of bad frame appears half a dozen of times and is pretty similar. Create signal_fault() fonction to perform that logging. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/fa094445c119fc00315e1c13783b493346306c6a.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/signal: Call get_tm_stackpointer() from get_sigframe()Christophe Leroy4-10/+11
Instead of calling get_tm_stackpointer() from the caller, call it directly from get_sigframe(). This avoids a double call and allows get_tm_stackpointer() to become static and be inlined into get_sigframe() by GCC. Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/abfdc105b8b28c4eb3ab9a26297d17f302b600ea.1597770847.git.christophe.leroy@csgroup.eu
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