tree 448b71b90c07b95ce5f83d9eff3b7c9697d97c7d
parent 28e4748e5e3d313056ed38abeff4b455abd02c1b
author Alexandre Ghiti <alexghiti@rivosinc.com> 1706878031 +0100
committer Palmer Dabbelt <palmer@rivosinc.com> 1710950168 -0700
gpgsig -----BEGIN PGP SIGNATURE-----
 
 iQJHBAABCAAxFiEEKzw3R0RoQ7JKlDp6LhMZ81+7GIkFAmX7BxgTHHBhbG1lckBk
 YWJiZWx0LmNvbQAKCRAuExnzX7sYiQKqD/45oT5zIkANdYIB7VMx2bb2rghhmXoR
 PMKdGXgsDrY4KyxKvmTms1xzYcBYlif4lwxbwMaMpWv2IuKhdwmM8695X8jaGUVa
 IJRIIsyjG3MLtaL2xePh0VKxOhDNU/A3YPWPlN9/jIu7B/pQC4UJCDOhVF2USHN1
 L2JGRwQ0b4R+oyZSMRXIXAzHa0wmO766Ezq6kYg7dm9PqDYvEzxR12Do9nSwEMHn
 quziGpOJT3hRI76dvv+GHnSzoizbOJgcgRvjLpC3eckHcjpoTlnvoMIS7hwjfWP4
 cash0eiJYV9kzhXPtPKa5K3ytTppd2+tll7yda9WzEUQbeGr6jW6FbjqN18ZIC+3
 Xc6qTqV3OjacdwonLu8fO36hdQNJMw4OiSZq6/7+gj0Dj/K0NRiV20Z+qKElJw2U
 zONeo3q3T6KUe/wb+0kRS/72+hiAiJG9jUhmSCHTgHWaTvi12m2WpiA/beoh2IE4
 vgYcLoMdRO37zJBuSwy23K35PHKryIH33tF/mUrHV/Q19KDIyjOcY9qJx2iSFvzj
 t7zRlSgqNhGhiwXJ0MnP/efATcgNp8yv38zOhjoH8GYA7e6YeVJnXT8qhNpv8e4E
 KUYTBwHZ0N1WVun/M2huuNoE+7yfSEuAYQslvjAxXCGeub740DkzXYuudZxsTOLx
 9AQJyQ5ydzYA7A==
 =R+EA
 -----END PGP SIGNATURE-----

riscv: Only flush the mm icache when setting an exec pte

We used to emit a flush_icache_all() whenever a dirty executable
mapping is set in the page table but we can instead call
flush_icache_mm() which will only send IPIs to cores that currently run
this mm and add a deferred icache flush to the others.

The number of calls to sbi_remote_fence_i() (tested without IPI
support):

With a simple buildroot rootfs:
* Before: ~5k
* After :  4 (!)

Tested on HW, the boot to login is ~4.5% faster.

With an ubuntu rootfs:
* Before: ~24k
* After : ~13k

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240202124711.256146-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>