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plat/arm/css/sgi: Fix bl32 receive event - 0xC4000061 issue 

The issue is that, when interrupt is triggered and RAS handler
is entered, after interrupt handler finishes, TF-A will re-enter
bl32 and then crash.
sdei_dispatch_event() may return failing result in some cases,
for example kernel may not have registered a handler or RAS event
may happen early during boot. We restore the NS context when
sdei_dispatch_event() returns failing result.

error log :
Received delegated event
X0 :  0xC4000061
X1 :  0x0
X2 :  0x0
X3 :  0x0
Received event - 0xC4000061 on cpu 0
UnRecognized Event - 0xC4000061
Failed delegated event 0xC4000061, Status Invalid Parameter
Unhandled Exception in EL3.
x30            = 0x000000000401f700
x0             = 0xfffffffffffffffe
x1             = 0xfffffffffffffffe
x2             = 0x00000000600003c0

Signed-off-by: Ming Huang <huangming@linux.alibaba.com>
Change-Id: I9802e9a32eee0ac3b5a8bcc0362d0b0e3b71dc9f
This commit is contained in:
Ming Huang 2020-11-09 17:22:05 +08:00 committed by Manish Pandey
parent 6b2924bbbf
commit 9feb1e2f4b
1 changed files with 14 additions and 2 deletions
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16
plat/arm/css/sgi/sgi_ras.c
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@ -111,6 +111,7 @@ static int sgi_ras_intr_handler(const struct err_record_info *err_rec,
struct sgi_ras_ev_map *ras_map;
mm_communicate_header_t *header;
uint32_t intr;
int ret;
cm_el1_sysregs_context_save(NON_SECURE);
intr = data->interrupt;
@ -152,9 +153,20 @@ static int sgi_ras_intr_handler(const struct err_record_info *err_rec,
plat_ic_end_of_interrupt(intr);
/* Dispatch the event to the SDEI client */
sdei_dispatch_event(ras_map->sdei_ev_num);
ret = sdei_dispatch_event(ras_map->sdei_ev_num);
if (ret != 0) {
/*
* sdei_dispatch_event() may return failing result in some cases,
* for example kernel may not have registered a handler or RAS event
* may happen early during boot. We restore the NS context when
* sdei_dispatch_event() returns failing result.
*/
ERROR("SDEI dispatch failed: %d", ret);
cm_el1_sysregs_context_restore(NON_SECURE);
cm_set_next_eret_context(NON_SECURE);
}
return 0;
return ret;
}
int sgi_ras_intr_handler_setup(void)