NOUPSTREAM: firmware: Support Ampere Altra CPUECTLR_EL1 config driver

[adamliyi]

• 5.15 kernel:
  NOUPSTREAM: firmware: Support Ampere Altra CPUECTLR_EL1 config driver
  NOUPSTREAM: altra_cpuectlr: Only config the prefetcher bits

• 5.10 Kernel:
  0cd1cad NOUPSTREAM: firmware: Support Ampere Altra CPUECTLR_EL1 config driver

• 5.4 kernel:
  ea23de6 NOUPSTREAM: firmware: Support Ampere Altra CPUECTLR_EL1 config driver

[adamliyi]

Backport this patch to 5.4 and 5.10 kernel, and write unit test.

NOUPSTREAM firmware Support Ampere Altra CPUECTLR_EL1 config driver.patch.txt

[root@adam_mj_cent83 ~]# find /lib/modules/5.4.93+/ -name altra*
/lib/modules/5.4.93+/kernel/drivers/firmware/altra_cpuectlr_el1.ko
/lib/modules/5.4.93+/kernel/drivers/hwmon/altra-hwmon.ko
[root@adam_mj_cent83 ~]# modprobe altra_cpuectlr_el1
[root@adam_mj_cent83 ~]# cat /sys/firmware/altra_cpuectlr/
cpuectlr_el1_value     cpuectlr_el1_wen_mask  signature
[root@adam_mj_cent83 ~]# cat /sys/firmware/altra_cpuectlr/cpuectlr_el1_value
0x0
[root@adam_mj_cent83 ~]# cat /sys/firmware/altra_cpuectlr/cpuectlr_el1_wen_mask
0x0
[root@adam_mj_cent83 ~]# cat /sys/firmware/altra_cpuectlr/signature
0x43504d41