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soc/intel/common/block/smm: Ignore PM1 and GPE0 events in SCI mode 

When the SCI_EN bit is set, PM1 and GPE0 events will trigger a SCI
instead of a SMI#. However, SMI_STS bits PM1_STS and GPE0_STS can
still be set. Therefore, when SCI_EN is set, ignore PM1 and GPE0
events in the SMI# handler, as these events have triggered a SCI.
Do not ignore any other SMI# types, since they cannot cause a SCI.

Note that these bits are reserved on APL and GLK. However, SoC-specific
code already accounts for it. Thus, no special handling is needed here.

Change-Id: I5998b6bd61d796101786b57f9094cdaf0c3dfbaa
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50750
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Angel Pons 2021-02-15 15:15:22 +01:00
parent 8d735d2aa3
commit 517750745f
2 changed files with 6 additions and 16 deletions
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2
src/soc/intel/common/block/include/intelblocks/smihandler.h
View File

@ -46,8 +46,6 @@ const struct smm_save_state_ops *get_smm_save_state_ops(void);
*/
extern const smi_handler_t southbridge_smi[32];
#define SMI_HANDLER_SCI_EN(__bit) (1 << (__bit))
/*
* This function should be implemented in SOC specific code to handle
* the SMI event on SLP_EN. The default functionality is provided in

20
src/soc/intel/common/block/smm/smihandler.c
View File

@ -435,16 +435,6 @@ void smihandler_southbridge_espi(
mainboard_smi_espi_handler();
}
/* SMI handlers that should be serviced in SCI mode too. */
static uint32_t smihandler_soc_get_sci_mask(void)
{
uint32_t sci_mask =
SMI_HANDLER_SCI_EN(APM_STS_BIT) |
SMI_HANDLER_SCI_EN(SMI_ON_SLP_EN_STS_BIT);
return sci_mask;
}
void southbridge_smi_handler(void)
{
int i;
@ -458,12 +448,14 @@ void southbridge_smi_handler(void)
smi_sts = pmc_clear_smi_status();
/*
* In SCI mode, execute only those SMI handlers that have
* declared themselves as available for service in that mode
* using smihandler_soc_get_sci_mask.
* When the SCI_EN bit is set, PM1 and GPE0 events will trigger a SCI
* instead of a SMI#. However, SMI_STS bits PM1_STS and GPE0_STS can
* still be set. Therefore, when SCI_EN is set, ignore PM1 and GPE0
* events in the SMI# handler, as these events have triggered a SCI.
* Do not ignore any other SMI# types, since they cannot cause a SCI.
*/
if (pmc_read_pm1_control() & SCI_EN)
smi_sts &= smihandler_soc_get_sci_mask();
smi_sts &= ~(1 << PM1_STS_BIT | 1 << GPE0_STS_BIT);
if (!smi_sts)
return;