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arm64/sve: Backend logic for setting the vector length

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This patch implements the core logic for changing a task's vector
length on request from userspace.  This will be used by the ptrace
and prctl frontends that are implemented in later patches.

The SVE architecture permits, but does not require, implementations
to support vector lengths that are not a power of two.  To handle
this, logic is added to check a requested vector length against a
possibly sparse bitmap of available vector lengths at runtime, so
that the best supported value can be chosen.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Dave Martin 2017-10-31 15:51:08 +00:00 • committed by Will Deacon
parent 8cd969d28f
commit 7582e22038
3 changed files with 149 additions and 1 deletions
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5
include/uapi/linux/prctl.h
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@ -197,4 +197,9 @@ struct prctl_mm_map {
# define PR_CAP_AMBIENT_LOWER 3
# define PR_CAP_AMBIENT_CLEAR_ALL 4
/* arm64 Scalable Vector Extension controls */
# define PR_SVE_SET_VL_ONEXEC (1 << 18) /* defer effect until exec */
# define PR_SVE_VL_LEN_MASK 0xffff
# define PR_SVE_VL_INHERIT (1 << 17) /* inherit across exec */
#endif /* _LINUX_PRCTL_H */