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powerpc/xive: Add a kernel parameter for StoreEOI
StoreEOI is activated by default on platforms supporting the feature (POWER10) and will be used as soon as firmware advertises its availability. The kernel parameter provides a way to deactivate its use. It can be still be reactivated through debugfs. Signed-off-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211105102636.1016378-10-clg@kaod.org
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@ -6446,6 +6446,12 @@
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controller on both pseries and powernv
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controller on both pseries and powernv
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platforms. Only useful on POWER9 and above.
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platforms. Only useful on POWER9 and above.
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xive.store-eoi=off [PPC]
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By default on POWER10 and above, the kernel will use
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stores for EOI handling when the XIVE interrupt mode
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is active. This option allows the XIVE driver to use
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loads instead, as on POWER9.
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xhci-hcd.quirks [USB,KNL]
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xhci-hcd.quirks [USB,KNL]
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A hex value specifying bitmask with supplemental xhci
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A hex value specifying bitmask with supplemental xhci
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host controller quirks. Meaning of each bit can be
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host controller quirks. Meaning of each bit can be
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@ -1712,6 +1712,19 @@ static int __init xive_off(char *arg)
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}
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}
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__setup("xive=off", xive_off);
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__setup("xive=off", xive_off);
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static int __init xive_store_eoi_cmdline(char *arg)
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{
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if (!arg)
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return -EINVAL;
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if (strncmp(arg, "off", 3) == 0) {
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pr_info("StoreEOI disabled on kernel command line\n");
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xive_store_eoi = false;
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}
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return 0;
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}
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__setup("xive.store-eoi=", xive_store_eoi_cmdline);
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#ifdef CONFIG_DEBUG_FS
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#ifdef CONFIG_DEBUG_FS
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static void xive_debug_show_ipi(struct seq_file *m, int cpu)
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static void xive_debug_show_ipi(struct seq_file *m, int cpu)
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{
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{
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