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opal_console: fix serial console output corruption on powerpc64

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Adds OPAL_CONSOLE_WRITE error handling and implements a call to
OPAL_CONSOLE_WRITE_BUFFER_SPACE to verify if there's enough space
before writing to console.

This fixes serial port output getting corrupted on fast writes, like
on "dmesg" output.

Tested on Raptor Blackbird running powerpc64 BE kernel

Reviewed by:	luporl
Sponsored by:	Eldorado Reserach Institute (eldorado.org.br)
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D29063
This commit is contained in:
Alfredo Dal'Ava Junior 2021-04-16 19:51:15 -03:00
parent 3e34783420
commit b8bc6b7954
2 changed files with 43 additions and 7 deletions
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1
sys/powerpc/powernv/opal.h
View File

@ -56,6 +56,7 @@ int opal_call(uint64_t token, ...);
#define OPAL_PCI_CONFIG_WRITE_HALF_WORD 17
#define OPAL_PCI_CONFIG_WRITE_WORD 18
#define OPAL_PCI_EEH_FREEZE_STATUS 23
#define OPAL_CONSOLE_WRITE_BUFFER_SPACE 25
#define OPAL_PCI_EEH_FREEZE_CLEAR 26
#define OPAL_PCI_PHB_MMIO_ENABLE 27
#define OPAL_PCI_SET_PHB_MEM_WINDOW 28

49
sys/powerpc/powernv/opal_console.c
View File

@ -171,6 +171,24 @@ uart_opal_real_unmap_outbuffer(uint64_t *len)
mtx_unlock_spin(&opalcons_buffer.mtx);
}
static int64_t
uart_opal_console_write_buffer_space(int vtermid)
{
int64_t buffer_space_val = 0;
vm_paddr_t buffer_space_ptr;
if (pmap_bootstrapped)
buffer_space_ptr = vtophys(&buffer_space_val);
else
buffer_space_ptr = (vm_paddr_t)&buffer_space_val;
if (opal_call(OPAL_CONSOLE_WRITE_BUFFER_SPACE, vtermid,
buffer_space_ptr) != OPAL_SUCCESS)
return (-1);
return (be64toh(buffer_space_val));
}
static int
uart_opal_probe_node(struct uart_opal_softc *sc)
{
@ -420,12 +438,12 @@ uart_opal_put(struct uart_opal_softc *sc, void *buffer, size_t bufsize)
len -= 4;
}
#if 0
if (err != OPAL_SUCCESS)
len = 0;
#endif
if (err == OPAL_SUCCESS)
return (len);
else if (err == OPAL_BUSY_EVENT)
return(0);
return (len);
return (-1);
}
static int
@ -481,11 +499,28 @@ uart_opal_ttyoutwakeup(struct tty *tp)
struct uart_opal_softc *sc;
char buffer[8];
int len;
int64_t buffer_space;
sc = tty_softc(tp);
while ((len = ttydisc_getc(tp, buffer, sizeof(buffer))) != 0)
uart_opal_put(sc, buffer, len);
while ((len = ttydisc_getc(tp, buffer, sizeof(buffer))) != 0) {
int bytes_written = 0;
while (bytes_written == 0) {
buffer_space = uart_opal_console_write_buffer_space(sc->vtermid);
if (buffer_space == -1)
/* OPAL failure or invalid terminal */
break;
else if (buffer_space >= len)
bytes_written = uart_opal_put(sc, buffer, len);
if (bytes_written == 0)
/* OPAL must be busy, poll and retry */
opal_call(OPAL_POLL_EVENTS, NULL);
else if (bytes_written == -1)
/* OPAL failure or invalid terminal */
break;
}
}
}
static void