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arm_mpam: propagate MSC access errors for state saving function

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Allow the mpam_save_mbwu_state() function to return an error, and
propagate read and write errors from the lower level up.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Tested-by: Gavin Shan <gshan@redhat.com> # on NVIDIA Grace Hopper
[morse: Fixed merge conflicts in mpam_save_mbwu_state() and __ris_msmon_read()]
Signed-off-by: James Morse <james.morse@arm.com>
This commit is contained in:
Andre Przywara 2026-10-02 17:04:41 +01:00 committed by James Morse
parent d326995393
commit a3a94c13c4
1 changed files with 13 additions and 4 deletions
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17
drivers/resctrl/mpam_devices.c
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@ -1859,6 +1859,7 @@ static int mpam_restore_mbwu_state(void *_ris)
static int mpam_save_mbwu_state(void *arg)
{
int i;
int ret;
u64 val;
struct mon_cfg *cfg;
struct mon_read mbwu_arg;
@ -1877,10 +1878,18 @@ static int mpam_save_mbwu_state(void *arg)
mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, i) |
FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
mpam_read_monsel_reg(msc, CFG_MBWU_FLT, &cur_flt);
mpam_read_monsel_reg(msc, CFG_MBWU_CTL, &cur_ctl);
mpam_write_monsel_reg(msc, CFG_MBWU_CTL, 0);
ret = mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
if (ret)
return ret;
ret = mpam_read_monsel_reg(msc, CFG_MBWU_FLT, &cur_flt);
if (ret)
return ret;
ret = mpam_read_monsel_reg(msc, CFG_MBWU_CTL, &cur_ctl);
if (ret)
return ret;
ret = mpam_write_monsel_reg(msc, CFG_MBWU_CTL, 0);
if (ret)
return ret;
cfg->mon = i;
cfg->pmg = FIELD_GET(MSMON_CFG_x_FLT_PMG, cur_flt);