On 30/01/18 18:28, Volodymyr Babchuk wrote:
Hi Julien,
On 30.01.18 20:01, Julien Grall wrote:
On 26/01/18 18:27, Volodymyr Babchuk wrote:
Hi,
Hi Volodymyr,
On 26.01.18 20:15, Julien Grall wrote:
Hi,
On 26/01/18 18:09, Volodymyr Babchuk wrote:
On 24.01.18 20:34, Julien Grall wrote:
- case PSCI_0_2_FN32(AFFINITY_INFO):
- case PSCI_0_2_FN64(AFFINITY_INFO):
+ switch ( fid )
{
- register_t taff = PSCI_ARG(regs, 1);
- uint32_t laff = PSCI_ARG32(regs, 2);
-
- perfc_incr(vpsci_cpu_affinity_info);
- PSCI_SET_RESULT(regs, do_psci_0_2_affinity_info(taff,
laff));
- return true;
- }
-
case ARM_SMCCC_FUNC_CALL_COUNT(STANDARD):
return fill_function_call_count(regs,
SSSC_SMCCC_FUNCTION_COUNT);
Now definition SSSC_SMCCC_FUNCTION_COUNT depends on code in vscpi.c.
Maybe it is time to introduce function get_psci_0_2_fn_count() and
use it there, what do you think?
Definitely not a function. It is a static number. But I can think of
separate the call count.
Yep, separate call count for vPSCI and for SSSC itself would be a
good thing.
Looking a bit more into it, this will not make a real improvement.
This will be equally difficult to remember to update the call count.
Nevertheless, I think that it is right thing to hold call count in the
same file, where calls are implemented. This increases chances that call
count will be held in sync.
So you are suggesting to implement a function? If so, that's a no-go
from my side.
Also, based on the recent SMCCC update (2.1.5 [1]):
"The General Service Queries for SMCCC call ranges are described in
SMCCC section 6.2. These functions are not always well suited to
firmware that is integrated with multiple sub-services being combined
into one service range. For example, PSCI and SDEI in the Standard
Service range. In particular, the ‘call count’ and ‘revision’
functions do not provide useful information to the caller when
multiple functions are provided. As a result, these are not widely
used to identify firmware services."
So I would not worry that much if the function count is not sync in
the future. BTW, it is already wrong in Xen 4.10. For standard
service, we don't implement 13 but 52.
2.1.5 deprecates general service queries in SMCCC 1.1. So, either we
upgradeSMCCC in Xen to 1.1 or we should be conform with SMCCC 1.0 and
should return right number of functions, including changes in Xen 4.10
that you mentioned.
BTW, personally I'm not happy with call UID and call version
deprecation. This makes impossible dynamic discovery of TEE, which was
used in my TEE mediator patch series.
2.1.5 only deprecates for Architecture service which is not implemented
for Xen at moment. Nothing is been said for the rest of them OP-TEE. The
documentation only acknowledge the fact it is difficult for some service
(such as SSSC) to infer information from that.
I looked at some implementation of SMCCC and those calls are either not
handled or the number are not correct.
Anyway, I have a SMCCC 1.1 patch series coming up soon.
Cheers,
--
Julien Grall
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