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authorAhmed S. Darwish <a.darwish@linutronix.de>2021-01-18 13:09:43 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2021-01-23 05:31:08 +0300
commit71dca5539fcf977aead0c9ea1962e70e78484b8e (patch)
tree6952edc75a79649e1709d61ce39f0dd123b4d4f0 /drivers/scsi/isci
parent5ce7902902adb8d154d67ba494f06daa29360ef0 (diff)
downloadlinux-71dca5539fcf977aead0c9ea1962e70e78484b8e.tar.xz
scsi: isci: Pass gfp_t flags in isci_port_bc_change_received()
Use the new libsas event notifiers API, which requires callers to explicitly pass the gfp_t memory allocation flags. libsas sas_notify_port_event() is called from isci_port_bc_change_received(). Below is the context analysis for all of its call chains: host.c: sci_controller_error_handler(): atomic, irq handler (*) OR host.c: sci_controller_completion_handler(), atomic, tasklet (*) -> sci_controller_process_completions() -> sci_controller_event_completion() -> phy.c: sci_phy_event_handler() -> port.c: sci_port_broadcast_change_received() -> isci_port_bc_change_received() host.c: isci_host_init() (@) spin_lock_irq(isci_host::scic_lock) -> sci_controller_initialize(), atomic (*) -> port_config.c: sci_port_configuration_agent_initialize() -> sci_mpc_agent_validate_phy_configuration() -> port.c: sci_port_add_phy() -> sci_port_set_phy() -> phy.c: sci_phy_set_port() -> port.c: sci_port_broadcast_change_received() -> isci_port_bc_change_received() port_config.c: apc_agent_timeout(), atomic, timer callback (*) -> sci_apc_agent_configure_ports() -> port.c: sci_port_add_phy() -> sci_port_set_phy() -> phy.c: sci_phy_set_port() -> port.c: sci_port_broadcast_change_received() -> isci_port_bc_change_received() phy.c: enter SCI state: *SCI_PHY_STOPPED* # Cont. from [1] -> sci_phy_stopped_state_enter() -> host.c: sci_controller_link_down() -> ->link_down_handler() == port_config.c: sci_apc_agent_link_down() -> port.c: sci_port_remove_phy() -> sci_port_clear_phy() -> phy.c: sci_phy_set_port() -> port.c: sci_port_broadcast_change_received() -> isci_port_bc_change_received() phy.c: enter SCI state: *SCI_PHY_STARTING* # Cont. from [2] -> sci_phy_starting_state_enter() -> host.c: sci_controller_link_down() -> ->link_down_handler() == port_config.c: sci_apc_agent_link_down() -> port.c: sci_port_remove_phy() -> sci_port_clear_phy() -> phy.c: sci_phy_set_port() -> port.c: sci_port_broadcast_change_received() -> isci_port_bc_change_received() [1] Call chains for entering state: *SCI_PHY_STOPPED* ----------------------------------------------------- host.c: isci_host_init() (@) spin_lock_irq(isci_host::scic_lock) -> sci_controller_initialize(), atomic (*) -> phy.c: sci_phy_initialize() -> phy.c: sci_phy_link_layer_initialization() -> phy.c: sci_change_state(SCI_PHY_STOPPED) init.c: PCI ->remove() || PM_OPS ->suspend, process context (+) -> host.c: isci_host_deinit() -> sci_controller_stop_phys() -> phy.c: sci_phy_stop() -> sci_change_state(SCI_PHY_STOPPED) phy.c: isci_phy_control() spin_lock_irqsave(isci_host::scic_lock, ) -> sci_phy_stop(), atomic (*) -> sci_change_state(SCI_PHY_STOPPED) [2] Call chains for entering state: *SCI_PHY_STARTING* ------------------------------------------------------ phy.c: phy_sata_timeout(), atimer, timer callback (*) spin_lock_irqsave(isci_host::scic_lock, ) -> sci_change_state(SCI_PHY_STARTING) host.c: phy_startup_timeout(), atomic, timer callback (*) spin_lock_irqsave(isci_host::scic_lock, ) -> sci_controller_start_next_phy() -> sci_phy_start() -> sci_change_state(SCI_PHY_STARTING) host.c: isci_host_start() (@) spin_lock_irq(isci_host::scic_lock) -> sci_controller_start(), atomic (*) -> sci_controller_start_next_phy() -> sci_phy_start() -> sci_change_state(SCI_PHY_STARTING) phy.c: Enter SCI state *SCI_PHY_SUB_FINAL* # Cont. from [2A] -> sci_change_state(SCI_PHY_SUB_FINAL) -> sci_phy_starting_final_substate_enter() -> sci_change_state(SCI_PHY_READY) -> Enter SCI state: *SCI_PHY_READY* -> sci_phy_ready_state_enter() -> host.c: sci_controller_link_up() -> sci_controller_start_next_phy() -> sci_phy_start() -> sci_change_state(SCI_PHY_STARTING) phy.c: sci_phy_event_handler(), atomic, discussed earlier (*) -> sci_change_state(SCI_PHY_STARTING), 11 instances port.c: isci_port_perform_hard_reset() spin_lock_irqsave(isci_host::scic_lock, ) -> port.c: sci_port_hard_reset(), atomic (*) -> phy.c: sci_phy_reset() -> sci_change_state(SCI_PHY_RESETTING) -> enter SCI PHY state: *SCI_PHY_RESETTING* -> sci_phy_resetting_state_enter() -> sci_change_state(SCI_PHY_STARTING) [2A] Call chains for entering SCI state: *SCI_PHY_SUB_FINAL* ------------------------------------------------------------ host.c: power_control_timeout(), atomic, timer callback (*) spin_lock_irqsave(isci_host::scic_lock, ) -> phy.c: sci_phy_consume_power_handler() -> phy.c: sci_change_state(SCI_PHY_SUB_FINAL) host.c: sci_controller_error_handler(): atomic, irq handler (*) OR host.c: sci_controller_completion_handler(), atomic, tasklet (*) -> sci_controller_process_completions() -> sci_controller_unsolicited_frame() -> phy.c: sci_phy_frame_handler() -> sci_change_state(SCI_PHY_SUB_AWAIT_SAS_POWER) -> sci_phy_starting_await_sas_power_substate_enter() -> host.c: sci_controller_power_control_queue_insert() -> phy.c: sci_phy_consume_power_handler() -> sci_change_state(SCI_PHY_SUB_FINAL) -> sci_change_state(SCI_PHY_SUB_FINAL) -> sci_controller_event_completion() -> phy.c: sci_phy_event_handler() -> sci_phy_start_sata_link_training() -> sci_change_state(SCI_PHY_SUB_AWAIT_SATA_POWER) -> sci_phy_starting_await_sata_power_substate_enter -> host.c: sci_controller_power_control_queue_insert() -> phy.c: sci_phy_consume_power_handler() -> sci_change_state(SCI_PHY_SUB_FINAL) As can be seen from the "(*)" markers above, almost all the call-chains are atomic. The only exception, marked with "(+)", is a PCI ->remove() and PM_OPS ->suspend() cold path. Thus, pass GFP_ATOMIC to the libsas port event notifier. Note, the now-replaced libsas APIs used in_interrupt() to implicitly decide which memory allocation type to use. This was only partially correct, as it fails to choose the correct GFP flags when just preemption or interrupts are disabled. Such buggy code paths are marked with "(@)" in the call chains above. Link: https://lore.kernel.org/r/20210118100955.1761652-8-a.darwish@linutronix.de Fixes: 1c393b970e0f ("scsi: libsas: Use dynamic alloced work to avoid sas event lost") Cc: Artur Paszkiewicz <artur.paszkiewicz@intel.com> Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/isci')
-rw-r--r--drivers/scsi/isci/port.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/isci/port.c b/drivers/scsi/isci/port.c
index 10136ae466e2..e50c3b0deeb3 100644
--- a/drivers/scsi/isci/port.c
+++ b/drivers/scsi/isci/port.c
@@ -164,7 +164,8 @@ static void isci_port_bc_change_received(struct isci_host *ihost,
"%s: isci_phy = %p, sas_phy = %p\n",
__func__, iphy, &iphy->sas_phy);
- sas_notify_port_event(&iphy->sas_phy, PORTE_BROADCAST_RCVD);
+ sas_notify_port_event_gfp(&iphy->sas_phy,
+ PORTE_BROADCAST_RCVD, GFP_ATOMIC);
sci_port_bcn_enable(iport);
}