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pcie: minor cleanups for slot control/status 

Rename function arguments to make intent clearer.
Better documentation for slot control logic.

Suggested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2019-07-01 05:29:51 -04:00
parent 110c477c2e
commit d85d65cc29
2 changed files with 13 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
hw/pci/pcie.c
View File

@ -602,7 +602,8 @@ void pcie_cap_slot_get(PCIDevice *dev, uint16_t *slt_ctl, uint16_t *slt_sta)
*slt_sta = pci_get_word(exp_cap + PCI_EXP_SLTSTA);
}
void pcie_cap_slot_write_config(PCIDevice *dev, uint16_t slt_ctl, uint16_t slt_sta,
void pcie_cap_slot_write_config(PCIDevice *dev,
uint16_t old_slt_ctl, uint16_t old_slt_sta,
uint32_t addr, uint32_t val, int len)
{
uint32_t pos = dev->exp.exp_cap;
@ -625,8 +626,8 @@ void pcie_cap_slot_write_config(PCIDevice *dev, uint16_t slt_ctl, uint16_t slt_s
PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC | \
PCI_EXP_SLTSTA_CC)
if (val & ~slt_sta & PCIE_SLOT_EVENTS) {
sltsta = (sltsta & ~PCIE_SLOT_EVENTS) | (slt_sta & PCIE_SLOT_EVENTS);
if (val & ~old_slt_sta & PCIE_SLOT_EVENTS) {
sltsta = (sltsta & ~PCIE_SLOT_EVENTS) | (old_slt_sta & PCIE_SLOT_EVENTS);
pci_set_word(exp_cap + PCI_EXP_SLTSTA, sltsta);
}
hotplug_event_clear(dev);
@ -646,13 +647,17 @@ void pcie_cap_slot_write_config(PCIDevice *dev, uint16_t slt_ctl, uint16_t slt_s
}
/*
* If the slot is polulated, power indicator is off and power
* If the slot is populated, power indicator is off and power
* controller is off, it is safe to detach the devices.
*
* Note: don't detach if condition was already true:
* this is a work around for guests that overwrite
* control of powered off slots before powering them on.
*/
if ((sltsta & PCI_EXP_SLTSTA_PDS) && (val & PCI_EXP_SLTCTL_PCC) &&
(val & PCI_EXP_SLTCTL_PIC_OFF) == PCI_EXP_SLTCTL_PIC_OFF &&
(!(slt_ctl & PCI_EXP_SLTCTL_PCC) ||
(slt_ctl & PCI_EXP_SLTCTL_PIC_OFF) != PCI_EXP_SLTCTL_PIC_OFF)) {
(!(old_slt_ctl & PCI_EXP_SLTCTL_PCC) ||
(old_slt_ctl & PCI_EXP_SLTCTL_PIC_OFF) != PCI_EXP_SLTCTL_PIC_OFF)) {
PCIBus *sec_bus = pci_bridge_get_sec_bus(PCI_BRIDGE(dev));
pci_for_each_device(sec_bus, pci_bus_num(sec_bus),
pcie_unplug_device, NULL);

3
include/hw/pci/pcie.h
View File

@ -108,7 +108,8 @@ void pcie_cap_lnkctl_reset(PCIDevice *dev);
void pcie_cap_slot_init(PCIDevice *dev, uint16_t slot);
void pcie_cap_slot_reset(PCIDevice *dev);
void pcie_cap_slot_get(PCIDevice *dev, uint16_t *slot_ctl, uint16_t *slt_sta);
void pcie_cap_slot_write_config(PCIDevice *dev, uint16_t slot_ctl, uint16_t slt_sta,
void pcie_cap_slot_write_config(PCIDevice *dev,
uint16_t old_slot_ctl, uint16_t old_slt_sta,
uint32_t addr, uint32_t val, int len);
int pcie_cap_slot_post_load(void *opaque, int version_id);
void pcie_cap_slot_push_attention_button(PCIDevice *dev);