Messages in this thread | | | Subject | Re: [PATCH 1/8] arm64: move acpi/dt decision earlier in boot process | From | Matthias Brugger <> | Date | Mon, 22 Feb 2016 16:45:17 +0100 |
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On 22/02/16 14:46, Aleksey Makarov wrote: > From: Leif Lindholm <leif.lindholm@linaro.org> > > In order to support selecting earlycon via either ACPI or DT, move > the decision on whether to attempt ACPI configuration into the > early_param handling. Then make acpi_boot_table_init() bail out if > acpi_disabled. > > Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> > --- > arch/arm64/kernel/acpi.c | 54 ++++++++++++++++++++++++++---------------------- > 1 file changed, 29 insertions(+), 25 deletions(-) > > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c > index d1ce8e2..7a944f7 100644 > --- a/arch/arm64/kernel/acpi.c > +++ b/arch/arm64/kernel/acpi.c > @@ -44,6 +44,19 @@ EXPORT_SYMBOL(acpi_pci_disabled); > static bool param_acpi_off __initdata; > static bool param_acpi_force __initdata; > > +static int __init dt_scan_depth1_nodes(unsigned long node, > + const char *uname, int depth, > + void *data) > +{ > + /* > + * Return 1 as soon as we encounter a node at depth 1 that is > + * not the /chosen node. > + */ > + if (depth == 1 && (strcmp(uname, "chosen") != 0)) > + return 1; > + return 0; > +} > + > static int __init parse_acpi(char *arg) > { > if (!arg) > @@ -57,23 +70,27 @@ static int __init parse_acpi(char *arg) > else > return -EINVAL; /* Core will print when we return error */ > > - return 0; > -} > -early_param("acpi", parse_acpi); > + /* > + * Enable ACPI instead of device tree unless > + * - ACPI has been disabled explicitly (acpi=off), or > + * - the device tree is not empty (it has more than just a /chosen node) > + * and ACPI has not been force enabled (acpi=force) > + */ > + if (param_acpi_off || > + (!param_acpi_force && of_scan_flat_dt(dt_scan_depth1_nodes, NULL))) > + return 0; > > -static int __init dt_scan_depth1_nodes(unsigned long node, > - const char *uname, int depth, > - void *data) > -{ > /* > - * Return 1 as soon as we encounter a node at depth 1 that is > - * not the /chosen node. > + * ACPI is disabled at this point. Enable it in order to parse > + * the ACPI tables and carry out sanity checks > */ > - if (depth == 1 && (strcmp(uname, "chosen") != 0)) > - return 1; > + enable_acpi(); > +
So we only enable ACPI if we pass acpi=force as kernel parameter? I'm not sure if this is what you wanted to do.
Regards, Matthias
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