Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <asm/simd.h>
|
|
#include <asm/switch_to.h>
|
|
#include <linux/cpufeature.h>
|
|
#include <linux/jump_label.h>
|
|
#include <linux/preempt.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#define VMX_ALIGN 16
|
|
#define VMX_ALIGN_MASK (VMX_ALIGN-1)
|
|
|
|
#define VECTOR_BREAKPOINT 512
|
|
|
|
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
|
|
|
|
#define crc32_le_arch crc32_le_base /* not implemented on this arch */
|
|
#define crc32_be_arch crc32_be_base /* not implemented on this arch */
|
|
|
|
u32 __crc32c_vpmsum(u32 crc, const u8 *p, size_t len);
|
|
|
|
static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
|
|
{
|
|
unsigned int prealign;
|
|
unsigned int tail;
|
|
|
|
if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) ||
|
|
!static_branch_likely(&have_vec_crypto) ||
|
|
unlikely(!may_use_simd()))
|
|
return crc32c_base(crc, p, len);
|
|
|
|
if ((unsigned long)p & VMX_ALIGN_MASK) {
|
|
prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
|
|
crc = crc32c_base(crc, p, prealign);
|
|
len -= prealign;
|
|
p += prealign;
|
|
}
|
|
|
|
if (len & ~VMX_ALIGN_MASK) {
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
enable_kernel_altivec();
|
|
crc = __crc32c_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);
|
|
disable_kernel_altivec();
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
}
|
|
|
|
tail = len & VMX_ALIGN_MASK;
|
|
if (tail) {
|
|
p += len & ~VMX_ALIGN_MASK;
|
|
crc = crc32c_base(crc, p, tail);
|
|
}
|
|
|
|
return crc;
|
|
}
|
|
|
|
#define crc32_mod_init_arch crc32_mod_init_arch
|
|
static void crc32_mod_init_arch(void)
|
|
{
|
|
if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
|
|
(cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))
|
|
static_branch_enable(&have_vec_crypto);
|
|
}
|
|
|
|
static inline u32 crc32_optimizations_arch(void)
|
|
{
|
|
if (static_key_enabled(&have_vec_crypto))
|
|
return CRC32C_OPTIMIZATION;
|
|
return 0;
|
|
}
|