Hi,
please ignore this fix, original logic is right. the Read ACK register directly contain the ACK value, not the ACK address.
On 2017/8/3 23:42, Dongjiu Geng wrote:
> In GHESv2, The read_ack_register is used to specify the
> location of the read ack register, it is only the physical
> address, but not the value. so needs to continue reading
> the address to get the right value. Also It needs to write
> the ack value to the right physical address.
>
> Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx>
> ---
> drivers/acpi/apei/ghes.c | 19 ++++++++++++++-----
> 1 file changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index bb83044..44bb65f 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -703,16 +703,25 @@ static void ghes_estatus_cache_add(
> static int ghes_ack_error(struct acpi_hest_generic_v2 *gv2)
> {
> int rc;
> - u64 val = 0;
> + u64 ack_paddr;
> + u64 ack_val = 0;
>
> - rc = apei_read(&val, &gv2->read_ack_register);
> + rc = apei_read(&ack_paddr, &gv2->read_ack_register);
> if (rc)
> return rc;
>
> - val &= gv2->read_ack_preserve << gv2->read_ack_register.bit_offset;
> - val |= gv2->read_ack_write << gv2->read_ack_register.bit_offset;
> + if (!ack_paddr)
> + return -ENOENT;
> +
> + ghes_copy_tofrom_phys(&ack_val, ack_paddr,
> + sizeof(u64), 1);
>
> - return apei_write(val, &gv2->read_ack_register);
> + ack_val &= gv2->read_ack_preserve << gv2->read_ack_register.bit_offset;
> + ack_val |= gv2->read_ack_write << gv2->read_ack_register.bit_offset;
> +
> + ghes_copy_tofrom_phys(&ack_val, ack_paddr,
> + sizeof(u64), 0);
> + return 0;
> }
>
> static void __ghes_panic(struct ghes *ghes)
>
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