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arm64 fixes for 5.19-rc2:

Browse source 
- SME save/restore for EFI fix - incorrect logic for detecting the need
   for saving/restoring the FFR state.
 
 - SME fix for a CPU ID field value.
 
 - Sysreg generation awk script fix (comparison operator).
 
 - Some typos in documentation or comments and silence a sparse warning
   (missing prototype).
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - SME save/restore for EFI fix - incorrect logic for detecting the need
   for saving/restoring the FFR state.

 - SME fix for a CPU ID field value.

 - Sysreg generation awk script fix (comparison operator).

 - Some typos in documentation or comments and silence a sparse warning
   (missing prototype).

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Add kasan_hw_tags_enable() prototype to silence sparse
  arm64/sme: Fix EFI save/restore
  arm64/fpsimd: Fix typo in comment
  arm64/sysreg: Fix typo in Enum element regex
  arm64/sme: Fix SVE/SME typo in ABI documentation
  arm64/sme: Fix tests for 0b1111 value ID registers
This commit is contained in:
Linus Torvalds 2022-06-10 11:03:51 -07:00
commit 36a2366379
5 changed files with 25 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
Documentation/arm64/sme.rst
View file

@ -371,7 +371,7 @@ The regset data starts with struct user_za_header, containing:
Appendix A. SME programmer's model (informative)
=================================================
This section provides a minimal description of the additions made by SVE to the
This section provides a minimal description of the additions made by SME to the
ARMv8-A programmer's model that are relevant to this document.
Note: This section is for information only and not intended to be complete or

4
arch/arm64/include/asm/sysreg.h
View file

@ -843,9 +843,9 @@
#define ID_AA64SMFR0_F32F32_SHIFT 32
#define ID_AA64SMFR0_FA64 0x1
#define ID_AA64SMFR0_I16I64 0x4
#define ID_AA64SMFR0_I16I64 0xf
#define ID_AA64SMFR0_F64F64 0x1
#define ID_AA64SMFR0_I8I32 0x4
#define ID_AA64SMFR0_I8I32 0xf
#define ID_AA64SMFR0_F16F32 0x1
#define ID_AA64SMFR0_B16F32 0x1
#define ID_AA64SMFR0_F32F32 0x1

20
arch/arm64/kernel/fpsimd.c
View file

@ -331,7 +331,7 @@ void task_set_vl_onexec(struct task_struct *task, enum vec_type type,
* trapping to the kernel.
*
* When stored, Z0-Z31 (incorporating Vn in bits[127:0] or the
* corresponding Zn), P0-P15 and FFR are encoded in in
* corresponding Zn), P0-P15 and FFR are encoded in
* task->thread.sve_state, formatted appropriately for vector
* length task->thread.sve_vl or, if SVCR.SM is set,
* task->thread.sme_vl.
@ -1916,10 +1916,15 @@ void __efi_fpsimd_begin(void)
if (system_supports_sme()) {
svcr = read_sysreg_s(SYS_SVCR);
if (!system_supports_fa64())
ffr = svcr & SVCR_SM_MASK;
__this_cpu_write(efi_sm_state,
svcr & SVCR_SM_MASK);
__this_cpu_write(efi_sm_state, ffr);
/*
* Unless we have FA64 FFR does not
* exist in streaming mode.
*/
if (!system_supports_fa64())
ffr = !(svcr & SVCR_SM_MASK);
}
sve_save_state(sve_state + sve_ffr_offset(sve_max_vl()),
@ -1964,8 +1969,13 @@ void __efi_fpsimd_end(void)
sysreg_clear_set_s(SYS_SVCR,
0,
SVCR_SM_MASK);
/*
* Unless we have FA64 FFR does not
* exist in streaming mode.
*/
if (!system_supports_fa64())
ffr = efi_sm_state;
ffr = false;
}
}

6
arch/arm64/kernel/mte.c
View file

@ -244,6 +244,11 @@ static void mte_update_gcr_excl(struct task_struct *task)
SYS_GCR_EL1);
}
#ifdef CONFIG_KASAN_HW_TAGS
/* Only called from assembly, silence sparse */
void __init kasan_hw_tags_enable(struct alt_instr *alt, __le32 *origptr,
__le32 *updptr, int nr_inst);
void __init kasan_hw_tags_enable(struct alt_instr *alt, __le32 *origptr,
__le32 *updptr, int nr_inst)
{
@ -252,6 +257,7 @@ void __init kasan_hw_tags_enable(struct alt_instr *alt, __le32 *origptr,
if (kasan_hw_tags_enabled())
*updptr = cpu_to_le32(aarch64_insn_gen_nop());
}
#endif
void mte_thread_init_user(void)
{

2
arch/arm64/tools/gen-sysreg.awk
View file

@ -253,7 +253,7 @@ END {
next
}
/0b[01]+/ && block = "Enum" {
/0b[01]+/ && block == "Enum" {
expect_fields(2)
val = $1
name = $2