Changes in coprocessor.S

11e969bc - xtensa: support coprocessors on SMP

Fri, 15 Apr 2022 10:05:31 +0000

xtensa: support coprocessors on SMPCurrent coprocessor support on xtensa only works correctly onuniprocessor configurations. Make it work on SMP too and keep it lazy.Make coprocessor_owner array per-CPU and move it to struct exc_table foreasy access from the fast_coprocessor exception handler. Allow task tohave live coprocessors only on single CPU, record this CPU number in thestruct thread_info::cp_owner_cpu. Change struct thread_info::cpenablemeaning to be 'coprocessors live on cp_owner_cpu'.Introduce C-level coprocessor exception handler that flushes andreleases live coprocessors of the task taking 'coprocessor disabled'exception and call it from the fast_coprocessor handler when the taskhas live coprocessors on other CPU.Make coprocessor_flush_all and coprocessor_release_all work correctlywhen called from any CPU by sending IPI to the cp_owner_cpu. Addfunction coprocessor_flush_release_all to do flush followed by releaseatomically. Add function local_coprocessors_flush_release_all to flushand release all coprocessors on the local CPU and use it to flushcoprocessor contexts from the CPU that goes offline.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

f29cab29 - xtensa: get rid of stack frame in coprocessor_flush

Mon, 18 Apr 2022 07:14:00 +0000

xtensa: get rid of stack frame in coprocessor_flushcoprocessor_flush is an ordinary function, it can use all registers.Don't reserve stack frame for it and use a7 to preserve a0 around thecontext saving call.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

e45d4bfb - xtensa: merge SAVE_CP_REGS_TAB and LOAD_CP_REGS_TAB

Mon, 18 Apr 2022 19:44:49 +0000

xtensa: merge SAVE_CP_REGS_TAB and LOAD_CP_REGS_TABBoth tables share the same offset field but the different functionpointers. Merge them into single table with 3-element entries to reducecode and data duplication.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

6179ef4d - xtensa: use callx0 opcode in fast_coprocessor

Thu, 14 Apr 2022 05:50:54 +0000

xtensa: use callx0 opcode in fast_coprocessorInstead of emulating call0 in fast_coprocessor use that opcode directly.Use 'ret' instead of 'jx a0'.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

839769c3 - xtensa: fix a7 clobbering in coprocessor context load/store

Thu, 14 Apr 2022 05:44:36 +0000

xtensa: fix a7 clobbering in coprocessor context load/storeFast coprocessor exception handler saves a3..a6, but coprocessor contextload/store code uses a4..a7 as temporaries, potentially clobbering a7.'Potentially' because coprocessor state load/store macros may not useall four temporary registers (and neither FPU nor HiFi macros do).Use a3..a6 as intended.Cc: stable@vger.kernel.orgFixes: c658eac628aa ("[XTENSA] Add support for configurable registers and coprocessors")Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

ab5eb336 - xtensa: move coprocessor_flush to the .text section

Thu, 25 Feb 2021 19:42:46 +0000

xtensa: move coprocessor_flush to the .text sectioncoprocessor_flush is not a part of fast exception handlers, but it usesparts of fast coprocessor handling code that's why it's in the samesource file. It uses call0 opcode to invoke those parts so there are nolimitations on their relative location, but the rest of the code callscoprocessor_flush with call8 and that doesn't work when vectors areplaced in a different gigabyte-aligned area than the rest of the kernel.Move coprocessor_flush from the .exception.text section to the .text sothat it's reachable from the rest of the kernel with call8.Cc: stable@vger.kernel.orgSigned-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

50722f0b - xtensa: move fast exception handlers close to vectors

Sat, 01 Feb 2020 02:48:43 +0000

xtensa: move fast exception handlers close to vectorsOn XIP kernels it makes sense to have exception vectors and fastexception handlers together (in a fast memory). In addition, with MTDXIP support both vectors and fast exception handlers must be outside ofthe FLASH.Add section .exception.text and move fast exception handlers to it.Put it together with vectors when vectors are outside of the .text.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

5b787914 - xtensa: drop unused function fast_coprocessor_double

Sat, 01 Feb 2020 02:15:36 +0000

xtensa: drop unused function fast_coprocessor_doublefast_coprocessor_double is not used since commit c658eac628aa ("[XTENSA]Add support for configurable registers and coprocessors"). Remove it.There should be no coprocessor exceptions generated in the exceptionhandling paths while PS.EXCM is set.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

d80a5053 - xtensa: drop unneeded headers from coprocessor.S

Mon, 25 Nov 2019 20:57:02 +0000

xtensa: drop unneeded headers from coprocessor.SA bunch of irrelevant headers is included into coprocessor.S. Removethem and add necessary asm/regs.h.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

e3cacb73 - xtensa: fix build for cores with coprocessors

Thu, 25 Jul 2019 00:39:47 +0000

xtensa: fix build for cores with coprocessorsAssembly entry/return abstraction change didn't add asmmacro.h includestatement to coprocessor.S, resulting in references to undefined macrosabi_entry and abi_ret on cores that define XTENSA_HAVE_COPROCESSORS.Fix that by including asm/asmmacro.h from the coprocessor.S.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

d6d5f19e - xtensa: abstract 'entry' and 'retw' in assembly code

Mon, 13 May 2019 03:28:25 +0000

xtensa: abstract 'entry' and 'retw' in assembly codeProvide abi_entry, abi_entry_default, abi_ret and abi_ret_default macrosthat allocate aligned stack frame in windowed and call0 ABIs.Provide XTENSA_SPILL_STACK_RESERVE macro that specifies required stackframe size when register spilling is involved.Replace all uses of 'entry' and 'retw' with the above macros.This makes most of the xtensa assembly code ready for XEA3 and call0 ABI.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

5dacbbef - xtensa: simplify coprocessor.S

Mon, 26 Nov 2018 07:32:28 +0000

xtensa: simplify coprocessor.SUse addresses instead of offsets and drop unneeded offset -> addresscalculations. Don't generate any code for undefined coprocessors.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

3ffc2df9 - xtensa: drop unused coprocessor helper functions

Mon, 26 Nov 2018 21:15:21 +0000

xtensa: drop unused coprocessor helper functionscoprocessor_save, coprocessor_load and coprocessor_restore are neitherused nor exported for use by modules. Drop them.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

2da03d41 - xtensa: use call instead of callx in assembly code

Sun, 10 Dec 2017 02:44:11 +0000

xtensa: use call instead of callx in assembly codeNow that xtensa assembly sources are compiled with -mlongcalls let theassembler and linker relax call instructions into l32r + callx whereneeded. This change makes the code cleaner and potentially a bit faster.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

d9c7710d - xtensa: drop unused fast_io_protect function

Mon, 26 Jan 2015 21:27:05 +0000

xtensa: drop unused fast_io_protect functionfast_io_protect is not used anywhere, drop its definition.Signed-off-by: Max Filippov List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

76580237 - xtensa: split uaccess.h into C and asm sides

Sun, 04 Sep 2016 18:26:36 +0000

xtensa: split uaccess.h into C and asm sidesSigned-off-by: Al Viro List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

99d5040e - xtensa: keep a3 and excsave1 on entry to exception handlers

Wed, 03 Jul 2013 16:23:28 +0000

xtensa: keep a3 and excsave1 on entry to exception handlersBased on the SMP patch by Joe Taylor and subsequent fixes.Preserve exception table pointer (normally stored in excsave1 SR) as itcannot be easily restored in SMP environment.Signed-off-by: Max Filippov Signed-off-by: Chris Zankel List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

c4c4594b - xtensa: clean up files to make them code-style compliant

Thu, 29 Nov 2012 00:53:51 +0000

xtensa: clean up files to make them code-style compliantRemove heading and trailing spaces, trim trailing lines, and wrap linesthat are longer than 80 characters.Signed-off-by: Chris Zankel List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

d1538c46 - xtensa: provide proper assembler function boundaries with ENDPROC()

Sat, 17 Nov 2012 00:16:20 +0000

xtensa: provide proper assembler function boundaries with ENDPROC()Use ENDPROC() to mark the end of assembler functions.Signed-off-by: Chris Zankel List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S

bc5378fc - xtensa: reorganize SR referencing

Sun, 14 Oct 2012 23:55:38 +0000

xtensa: reorganize SR referencing- reference SRs by names where possible, not by numbers;- get rid of __stringify around SR names where possible;- remove unneeded SR names from asm/regs.h;- add SREG_ prefix to remaining SR names;Signed-off-by: Max Filippov Signed-off-by: Chris Zankel List of files: /linux-6.15/arch/xtensa/kernel/coprocessor.S