AuxXxilium/linux_dsm_epyc7002
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af8bb9f898
linux_dsm_epyc7002/drivers/pci
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Bjorn Helgaas af8bb9f898 PCI/ACPI: Request LTR control from platform before using it 
Per the PCI Firmware spec r3.2, sec 4.5, an ACPI-based OS should use _OSC
to request control of Latency Tolerance Reporting (LTR) before using it.

Request control of LTR, and if the platform does not grant control, don't
use it.

N.B. If the hardware supports LTR and the ASPM L1.2 substate but the BIOS
doesn't support LTR in _OSC, we previously would enable ASPM L1.2.  This
patch will prevent us from enabling ASPM L1.2 in that case.  It does not
prevent us from enabling PCI-PM L1.2, since that doesn't depend on LTR.
See PCIe r40, sec 5.5.1, for the L1 PM substate entry conditions.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-04-23 08:18:44 -05:00
..
cadence PCI: endpoint: Make epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar 2018-04-03 12:38:05 +01:00
dwc pci-v4.17-changes 2018-04-06 18:31:06 -07:00
endpoint PCI: endpoint: Make sure that BAR_5 does not have 64-bit flag set when clearing 2018-04-03 12:38:05 +01:00
host Merge branch 'lorenzo/pci/xilinx' 2018-04-04 13:28:57 -05:00
hotplug powerpc updates for 4.17 2018-04-07 12:08:19 -07:00
pcie PCI/ASPM: Disable ASPM L1.2 Substate if we don't have LTR 2018-04-18 16:10:34 -05:00
switch vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
access.c Merge branch 'pci/vpd' 2018-04-04 13:28:40 -05:00
ats.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
bus.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
ecam.c PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate 2018-01-28 15:48:29 -06:00
host-bridge.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
iov.c Merge branch 'pci/virtualization' 2018-04-04 13:28:26 -05:00
irq.c PCI: Add wrappers for dev_printk() 2018-01-18 12:55:24 -06:00
Kconfig Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
Makefile PCI: Tidy Makefiles 2018-03-19 14:20:41 -05:00
mmap.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
msi.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
of.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
pci-acpi.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
pci-driver.c pci-v4.17-changes 2018-04-06 18:31:06 -07:00
pci-label.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
pci-mid.c PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate 2018-01-28 15:48:29 -06:00
pci-stub.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
pci-sysfs.c Merge branch 'pci/vpd' 2018-04-04 13:28:40 -05:00
pci.c PCI: Remove messages about reassigning resources 2018-04-11 08:46:50 -05:00
pci.h Merge branch 'pci/vpd' 2018-04-04 13:28:40 -05:00
probe.c PCI/ACPI: Request LTR control from platform before using it 2018-04-23 08:18:44 -05:00
proc.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
quirks.c PCI: Mark Broadcom HT1100 and HT2000 Root Port Extended Tags as broken 2018-04-10 14:44:21 -05:00
remove.c PCI: Add SPDX GPL-2.0 when no license was specified 2018-01-26 11:45:16 -06:00
rom.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
search.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
setup-bus.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
setup-irq.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
setup-res.c PCI: Remove messages about reassigning resources 2018-04-11 08:46:50 -05:00
slot.c Merge branch 'pci/misc' 2018-04-04 13:27:45 -05:00
syscall.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
vc.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
vpd.c pci-v4.17-changes 2018-04-06 18:31:06 -07:00
xen-pcifront.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00