From dedf052a254187c333b7d1c9b8c95a0c325e6a18 Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Thu, 16 Feb 2023 21:03:42 +0300 Subject: [PATCH] pci/shpc: more generic handle hot-unplug in shpc_slot_command() Free slot if both conditions (power-led = OFF and state = DISABLED) becomes true regardless of the sequence. It is similar to how PCIe hotplug works. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Anton Kuchin Message-Id: <20230216180356.156832-5-vsementsov@yandex-team.ru> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/pci/shpc.c | 52 ++++++++++++++++++++++++++++++--------------------- 1 file changed, 31 insertions(+), 21 deletions(-) diff --git a/hw/pci/shpc.c b/hw/pci/shpc.c index 25e4172382..959dc470f3 100644 --- a/hw/pci/shpc.c +++ b/hw/pci/shpc.c @@ -258,49 +258,59 @@ static void shpc_free_devices_in_slot(SHPCDevice *shpc, int slot) } } +static bool shpc_slot_is_off(uint8_t state, uint8_t power, uint8_t attn) +{ + return state == SHPC_STATE_DISABLED && power == SHPC_LED_OFF; +} + static void shpc_slot_command(SHPCDevice *shpc, uint8_t target, uint8_t state, uint8_t power, uint8_t attn) { - uint8_t current_state; int slot = SHPC_LOGICAL_TO_IDX(target); + uint8_t old_state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK); + uint8_t old_power = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK); + uint8_t old_attn = shpc_get_status(shpc, slot, SHPC_SLOT_ATTN_LED_MASK); + if (target < SHPC_CMD_TRGT_MIN || slot >= shpc->nslots) { shpc_invalid_command(shpc); return; } - current_state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK); - if (current_state == SHPC_STATE_ENABLED && state == SHPC_STATE_PWRONLY) { + + if (old_state == SHPC_STATE_ENABLED && state == SHPC_STATE_PWRONLY) { shpc_invalid_command(shpc); return; } - if (power != SHPC_LED_NO) { + if (power == SHPC_LED_NO) { + power = old_power; + } else { /* TODO: send event to monitor */ shpc_set_status(shpc, slot, power, SHPC_SLOT_PWR_LED_MASK); } - if (attn != SHPC_LED_NO) { + + if (attn == SHPC_LED_NO) { + attn = old_attn; + } else { /* TODO: send event to monitor */ shpc_set_status(shpc, slot, attn, SHPC_SLOT_ATTN_LED_MASK); } - if (state != SHPC_STATE_NO) { + + if (state == SHPC_STATE_NO) { + state = old_state; + } else { shpc_set_status(shpc, slot, state, SHPC_SLOT_STATE_MASK); } - if ((current_state == SHPC_STATE_ENABLED || - current_state == SHPC_STATE_PWRONLY) && - state == SHPC_STATE_DISABLED) + if (!shpc_slot_is_off(old_state, old_power, old_attn) && + shpc_slot_is_off(state, power, attn)) { - power = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK); - /* TODO: track what monitor requested. */ - /* Look at LED to figure out whether it's ok to remove the device. */ - if (power == SHPC_LED_OFF) { - shpc_free_devices_in_slot(shpc, slot); - shpc_set_status(shpc, slot, 1, SHPC_SLOT_STATUS_MRL_OPEN); - shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_EMPTY, - SHPC_SLOT_STATUS_PRSNT_MASK); - shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= - SHPC_SLOT_EVENT_MRL | - SHPC_SLOT_EVENT_PRESENCE; - } + shpc_free_devices_in_slot(shpc, slot); + shpc_set_status(shpc, slot, 1, SHPC_SLOT_STATUS_MRL_OPEN); + shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_EMPTY, + SHPC_SLOT_STATUS_PRSNT_MASK); + shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= + SHPC_SLOT_EVENT_MRL | + SHPC_SLOT_EVENT_PRESENCE; } }