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    SubjectRE: HELP: Is writeq an atomic operation??
    Date
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    On Friday, May 02, 2008 4:50 PM, Andi Kleen wrote: 
    >
    > > Here is a trace from pci express analyzer. I'm sending
    >
    > With what CPU/chipset was that?
    >

    I'm developing sas driver for next generation controllers. They should
    work at least on x86, x86_64, ia64, and ppc64. The host I was using for
    gathering that trace was x86_64 Intel Platform. Here is the lspci
    output:

    00:00.0 Host bridge: Intel Corporation E7520 Memory Controller Hub (rev
    0c)
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, fast devsel, latency 0
    Capabilities: [40] Vendor Specific Information

    00:00.1 Class ff00: Intel Corporation E7525/E7520 Error Reporting
    Registers (rev 0c)
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: fast devsel

    00:01.0 System peripheral: Intel Corporation E7520 DMA Controller (rev
    0c)
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: fast devsel, IRQ 5
    Memory at dd000000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: [b0] Message Signalled Interrupts: Mask- 64bit-
    Queue=0/1 Enable-

    00:02.0 PCI bridge: Intel Corporation E7525/E7520/E7320 PCI Express Port
    A (rev 0c) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
    I/O behind bridge: 00002000-00002fff
    Memory behind bridge: dd100000-dd1fffff
    Prefetchable memory behind bridge:
    0000000088000000-00000000880fffff
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Message Signalled Interrupts: Mask- 64bit-
    Queue=0/1 Enable-
    Capabilities: [64] Express Root Port (Slot-) IRQ 0
    Capabilities: [100] Advanced Error Reporting

    00:03.0 PCI bridge: Intel Corporation E7525/E7520/E7320 PCI Express Port
    A1 (rev 0c) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=02, subordinate=04, sec-latency=0
    I/O behind bridge: 00003000-00003fff
    Memory behind bridge: dd200000-dd3fffff
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Message Signalled Interrupts: Mask- 64bit-
    Queue=0/1 Enable-
    Capabilities: [64] Express Root Port (Slot-) IRQ 0
    Capabilities: [100] Advanced Error Reporting

    00:04.0 PCI bridge: Intel Corporation E7525/E7520 PCI Express Port B
    (rev 0c) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=05, subordinate=05, sec-latency=0
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Message Signalled Interrupts: Mask- 64bit-
    Queue=0/1 Enable-
    Capabilities: [64] Express Root Port (Slot-) IRQ 0
    Capabilities: [100] Advanced Error Reporting

    00:06.0 PCI bridge: Intel Corporation E7520 PCI Express Port C (rev 0c)
    (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=06, subordinate=06, sec-latency=0
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Message Signalled Interrupts: Mask- 64bit-
    Queue=0/1 Enable-
    Capabilities: [64] Express Root Port (Slot-) IRQ 0
    Capabilities: [100] Advanced Error Reporting

    00:1d.0 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB
    UHCI Controller #1 (rev 02) (prog-if 00 [UHCI])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, medium devsel, latency 0, IRQ 16
    I/O ports at 1400 [size=32]

    00:1d.1 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB
    UHCI Controller #2 (rev 02) (prog-if 00 [UHCI])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, medium devsel, latency 0, IRQ 19
    I/O ports at 1420 [size=32]

    00:1d.2 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB
    UHCI Controller #3 (rev 02) (prog-if 00 [UHCI])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, medium devsel, latency 0, IRQ 20
    I/O ports at 1440 [size=32]

    00:1d.3 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB
    UHCI Controller #4 (rev 02) (prog-if 00 [UHCI])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, medium devsel, latency 0, IRQ 16
    I/O ports at 1460 [size=32]

    00:1d.7 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2
    EHCI Controller (rev 02) (prog-if 20 [EHCI])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, medium devsel, latency 0, IRQ 21
    Memory at dd001000 (32-bit, non-prefetchable) [size=1K]
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Debug port

    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c2) (prog-if
    00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=07, subordinate=07, sec-latency=32
    I/O behind bridge: 00004000-00004fff
    Memory behind bridge: dd400000-deffffff
    Prefetchable memory behind bridge: 88100000-881fffff

    00:1f.0 ISA bridge: Intel Corporation 82801EB/ER (ICH5/ICH5R) LPC
    Interface Bridge (rev 02)
    Flags: bus master, medium devsel, latency 0

    00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA Controller
    (rev 02) (prog-if 8a [Master SecP PriP])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 20
    I/O ports at 01f0 [size=8]
    I/O ports at 03f4 [size=1]
    I/O ports at 0170 [size=8]
    I/O ports at 0374 [size=1]
    I/O ports at 14b0 [size=16]

    00:1f.3 SMBus: Intel Corporation 82801EB/ER (ICH5/ICH5R) SMBus
    Controller (rev 02)
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: medium devsel, IRQ 22
    I/O ports at 1100 [size=32]

    01:00.0 Mass storage controller [0108]: LSI Logic / Symbios Logic
    Unknown device 0077 (rev ff)
    Subsystem: Compaq Computer Corporation Unknown device 40a0
    Flags: bus master, fast devsel, latency 0, IRQ 5
    I/O ports at 2000 [size=256]
    Memory at dd140000 (64-bit, non-prefetchable) [size=16K]
    [virtual] Expansion ROM at 88000000 [disabled] [size=64K]
    Capabilities: [50] Power Management version 3
    Capabilities: [68] Express Endpoint IRQ 0
    Capabilities: [d0] Vital Product Data
    Capabilities: [a8] Message Signalled Interrupts: Mask- 64bit+
    Queue=0/0 Enable-
    Capabilities: [c0] MSI-X: Enable- Mask- TabSize=15
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [138] Power Budgeting

    02:00.0 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge
    A (rev 09) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=02, secondary=03, subordinate=03, sec-latency=64
    Capabilities: [44] Express PCI/PCI-X Bridge IRQ 0
    Capabilities: [5c] Message Signalled Interrupts: Mask- 64bit+
    Queue=0/0 Enable-
    Capabilities: [6c] Power Management version 2
    Capabilities: [d8] PCI-X bridge device
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [300] Power Budgeting

    02:00.1 PIC: Intel Corporation 6700/6702PXH I/OxAPIC Interrupt
    Controller A (rev 09) (prog-if 20 [IO(X)-APIC])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, fast devsel, latency 0
    Memory at dd200000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: [44] Express Endpoint IRQ 0
    Capabilities: [6c] Power Management version 2

    02:00.2 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge
    B (rev 09) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=02, secondary=04, subordinate=04, sec-latency=64
    I/O behind bridge: 00003000-00003fff
    Memory behind bridge: dd300000-dd3fffff
    Capabilities: [44] Express PCI/PCI-X Bridge IRQ 0
    Capabilities: [5c] Message Signalled Interrupts: Mask- 64bit+
    Queue=0/0 Enable-
    Capabilities: [6c] Power Management version 2
    Capabilities: [d8] PCI-X bridge device
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [300] Power Budgeting

    02:00.3 PIC: Intel Corporation 6700PXH I/OxAPIC Interrupt Controller B
    (rev 09) (prog-if 20 [IO(X)-APIC])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, fast devsel, latency 0
    Memory at dd201000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: [44] Express Endpoint IRQ 0
    Capabilities: [6c] Power Management version 2

    04:02.0 Ethernet controller: Intel Corporation 82546GB Gigabit Ethernet
    Controller (rev 03)
    Subsystem: Intel Corporation PRO/1000 MT Dual Port Server
    Adapter
    Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 17
    Memory at dd300000 (64-bit, non-prefetchable) [size=128K]
    I/O ports at 3000 [size=64]
    Capabilities: [dc] Power Management version 2
    Capabilities: [e4] PCI-X non-bridge device
    Capabilities: [f0] Message Signalled Interrupts: Mask- 64bit+
    Queue=0/0 Enable-

    04:02.1 Ethernet controller: Intel Corporation 82546GB Gigabit Ethernet
    Controller (rev 03)
    Subsystem: Intel Corporation PRO/1000 MT Dual Port Server
    Adapter
    Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 18
    Memory at dd320000 (64-bit, non-prefetchable) [size=128K]
    I/O ports at 3040 [size=64]
    Capabilities: [dc] Power Management version 2
    Capabilities: [e4] PCI-X non-bridge device
    Capabilities: [f0] Message Signalled Interrupts: Mask- 64bit+
    Queue=0/0 Enable-

    07:01.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
    (prog-if 00 [VGA])
    Subsystem: Super Micro Computer Inc Unknown device 5480
    Flags: bus master, stepping, medium devsel, latency 66, IRQ 10
    Memory at de000000 (32-bit, non-prefetchable) [size=16M]
    I/O ports at 4000 [size=256]
    Memory at dd400000 (32-bit, non-prefetchable) [size=4K]
    [virtual] Expansion ROM at 88100000 [disabled] [size=128K]
    Capabilities: [5c] Power Management version 2


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