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    SubjectRe: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card
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    On 23/10/17 12:31, Pavel Machek wrote:
    > Hi!
    >
    >>>> Did you use bounce buffers? Those were improving performance on
    >>>> some laptops with TI or Ricoh host controllers and nothing else was
    >>>> ever really using it (as can be seen from the commit).
    >>>
    >>> Thinkpad X220... how do I tell if I was using them? I believe so,
    >>> because I uncovered bug in them before.
    >>
    >> You are certainly using bounce buffers. What does lspci -knn show?
    >
    > Here is the output:
    > Pavel
    >
    > 00:00.0 Host bridge [0600]: Intel Corporation 2nd Generation Core Processor Family DRAM Controller [8086:0104] (rev 09)
    > Subsystem: Lenovo Device [17aa:21da]
    > 00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09)
    > Subsystem: Lenovo Device [17aa:21da]
    > Kernel driver in use: i915
    > 00:16.0 Communication controller [0780]: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 [8086:1c3a] (rev 04)
    > Subsystem: Lenovo Device [17aa:21da]
    > 00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit Network Connection [8086:1502] (rev 04)
    > Subsystem: Lenovo Device [17aa:21ce]
    > Kernel driver in use: e1000e
    > 00:1a.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 [8086:1c2d] (rev 04)
    > Subsystem: Lenovo Device [17aa:21da]
    > Kernel driver in use: ehci-pci
    > 00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller [8086:1c20] (rev 04)
    > Subsystem: Lenovo Device [17aa:21da]
    > Kernel driver in use: snd_hda_intel
    > 00:1c.0 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 [8086:1c10] (rev b4)
    > Kernel driver in use: pcieport
    > 00:1c.1 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 [8086:1c12] (rev b4)
    > Kernel driver in use: pcieport
    > 00:1c.3 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 [8086:1c16] (rev b4)
    > Kernel driver in use: pcieport
    > 00:1c.4 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 [8086:1c18] (rev b4)
    > Kernel driver in use: pcieport
    > 00:1d.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 [8086:1c26] (rev 04)
    > Subsystem: Lenovo Device [17aa:21da]
    > Kernel driver in use: ehci-pci
    > 00:1f.0 ISA bridge [0601]: Intel Corporation QM67 Express Chipset Family LPC Controller [8086:1c4f] (rev 04)
    > Subsystem: Lenovo Device [17aa:21da]
    > 00:1f.2 SATA controller [0106]: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller [8086:1c03] (rev 04)
    > Subsystem: Lenovo Device [17aa:21da]
    > Kernel driver in use: ahci
    > 00:1f.3 SMBus [0c05]: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller [8086:1c22] (rev 04)
    > Subsystem: Lenovo Device [17aa:21da]
    > 03:00.0 Network controller [0280]: Intel Corporation Centrino Wireless-N 1000 [Condor Peak] [8086:0084]
    > Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN [8086:1315]
    > Kernel driver in use: iwlwifi
    > 0d:00.0 System peripheral [0880]: Ricoh Co Ltd PCIe SDXC/MMC Host Controller [1180:e823] (rev 07)
    > Subsystem: Lenovo Device [17aa:21da]
    > Kernel driver in use: sdhci-pci

    Yes, the code for Ricoh in sdhci-pci specifies only SDMA which means no
    scatter-gather. That might benefit from bounce buffers, but it seems like
    the memory allocation was silently failing anyway if a card was inserted
    after memory has fragmented.

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