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| author | jhb <jhb@FreeBSD.org> | 2016-05-05 22:26:23 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2016-05-05 22:26:23 +0000 |
| commit | eb663acb54bc8677cc47448aa68f2e2393d5455b (patch) | |
| tree | 29e5b04d28fc642267d56b82b45a237b92fda1c3 /sys/dev/pci/pcireg.h | |
| parent | f05973c5eca6f66c0e216887c7125608d22b3689 (diff) | |
| download | FreeBSD-src-eb663acb54bc8677cc47448aa68f2e2393d5455b.zip FreeBSD-src-eb663acb54bc8677cc47448aa68f2e2393d5455b.tar.gz | |
Native PCI-express HotPlug support.
PCI-express HotPlug support is implemented via bits in the slot
registers of the PCI-express capability of the downstream port along
with an interrupt that triggers when bits in the slot status register
change.
This is implemented for FreeBSD by adding HotPlug support to the
PCI-PCI bridge driver which attaches to the virtual PCI-PCI bridges
representing downstream ports on HotPlug slots. The PCI-PCI bridge
driver registers an interrupt handler to receive HotPlug events. It
also uses the slot registers to determine the current HotPlug state
and drive an internal HotPlug state machine. For simplicty of
implementation, the PCI-PCI bridge device detaches and deletes the
child PCI device when a card is removed from a slot and creates and
attaches a PCI child device when a card is inserted into the slot.
The PCI-PCI bridge driver provides a bus_child_present which claims
that child devices are present on HotPlug-capable slots only when a
card is inserted. Rather than requiring a timeout in the RC for
config accesses to not-present children, the pcib_read/write_config
methods fail all requests when a card is not present (or not yet
ready).
These changes include support for various optional HotPlug
capabilities such as a power controller, mechanical latch,
electro-mechanical interlock, indicators, and an attention button.
It also includes support for devices which require waiting for
command completion events before initiating a subsequent HotPlug
command. However, it has only been tested on ExpressCard systems
which support surprise removal and have none of these optional
capabilities.
PCI-express HotPlug support is conditional on the PCI_HP option
which is enabled by default on arm64, x86, and powerpc.
Reviewed by: adrian, imp, vangyzen (older versions)
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D6136
Diffstat (limited to 'sys/dev/pci/pcireg.h')
| -rw-r--r-- | sys/dev/pci/pcireg.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/dev/pci/pcireg.h b/sys/dev/pci/pcireg.h index 68b5378..d463b7a 100644 --- a/sys/dev/pci/pcireg.h +++ b/sys/dev/pci/pcireg.h @@ -850,8 +850,16 @@ #define PCIEM_SLOT_CTL_CCIE 0x0010 #define PCIEM_SLOT_CTL_HPIE 0x0020 #define PCIEM_SLOT_CTL_AIC 0x00c0 +#define PCIEM_SLOT_CTL_AI_ON 0x0040 +#define PCIEM_SLOT_CTL_AI_BLINK 0x0080 +#define PCIEM_SLOT_CTL_AI_OFF 0x00c0 #define PCIEM_SLOT_CTL_PIC 0x0300 +#define PCIEM_SLOT_CTL_PI_ON 0x0100 +#define PCIEM_SLOT_CTL_PI_BLINK 0x0200 +#define PCIEM_SLOT_CTL_PI_OFF 0x0300 #define PCIEM_SLOT_CTL_PCC 0x0400 +#define PCIEM_SLOT_CTL_PC_ON 0x0000 +#define PCIEM_SLOT_CTL_PC_OFF 0x0400 #define PCIEM_SLOT_CTL_EIC 0x0800 #define PCIEM_SLOT_CTL_DLLSCE 0x1000 #define PCIER_SLOT_STA 0x1a |
