"ARM Server Base Boot Requirements" [1] mentions DBG2 (Microsoft Debug Port Table 2) [2] as a mandatory ACPI table that specifies debug ports. - Move earlycon early_param handling to serial to parse earlycon option once - Add definition of DBG2 subtypes. It's the same patch as in the SPCR series [3] - Refactor ACPI linker tables code to enable iterating over subtables other than subtables having acpi_subtype header (such as DBG2) - Implement macros ACPI_DBG2_DECLARE(name, type, subtype, setup_fn, data_ptr) that defines a handler for the port of the given type and subtype. - For each port defined by that macros that is also described in the ACPI DBG2 table call provided callback. - Implement a helper macros that can be used to define early serial console - Enable DBG2 on ARM64 - Define early console for pl011 serial Based on the work by Leif Lindholm <leif.lindholm@xxxxxxxxxx> [4] Should be applied to next-20160229. Tested on last QEMU with patches that introduce DBG2 and fix a QEMU bug: https://git.linaro.org/people/aleksey.makarov/qemu.git amakarov/gdb2.03 v3: - Drop "arm64: move acpi/dt decision earlier in boot process". It is incorrect. (Matthias Brugger) - Fix the message at port discovery. v2: https://lkml.kernel.org/g/1456333819-13482-1-git-send-email-aleksey.makarov@xxxxxxxxxx - Fix parse_acpi() (Matthias Brugger) - Add a reference to QEMU DBG2 patches and to original work - Rebase to the last linux-next v1: https://lkml.kernel.org/g/1456148818-26257-1-git-send-email-aleksey.makarov@xxxxxxxxxx [1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0044a/index.html [2] http://go.microsoft.com/fwlink/p/?LinkId=234837 [3] https://lkml.kernel.org/g/1455559532-8305-1-git-send-email-aleksey.makarov@xxxxxxxxxx [4] https://lkml.kernel.org/g/1441716217-23786-1-git-send-email-leif.lindholm@xxxxxxxxxx Aleksey Makarov (6): ACPI: add definitions of DBG2 subtypes ACPI: genaralize iterating over subtables in ACPI_PROBE_TABLE() ACPI: parse DBG2 table ACPI: serial: implement earlycon on ACPI DBG2 port ACPI: enable ACPI_DBG2_TABLE on ARM64 serial: pl011: add ACPI DBG2 serial port Leif Lindholm (1): of/serial: move earlycon early_param handling to serial Documentation/kernel-parameters.txt | 3 + arch/arm64/Kconfig | 1 + arch/arm64/kernel/acpi.c | 2 + drivers/acpi/Kconfig | 3 + drivers/acpi/Makefile | 1 + drivers/acpi/dbg2.c | 88 +++++++++++++++++++++++++++++ drivers/acpi/scan.c | 44 ++++++++++----- drivers/clocksource/arm_arch_timer.c | 3 +- drivers/irqchip/irq-gic.c | 4 +- drivers/of/fdt.c | 11 +--- drivers/tty/serial/amba-pl011.c | 3 + drivers/tty/serial/earlycon.c | 61 ++++++++++++++++++++ include/acpi/actbl2.h | 5 ++ include/asm-generic/vmlinux.lds.h | 1 + include/linux/acpi.h | 104 ++++++++++++++++++++++++----------- include/linux/acpi_dbg2.h | 68 +++++++++++++++++++++++ include/linux/clocksource.h | 2 +- include/linux/irqchip.h | 5 +- include/linux/of_fdt.h | 2 + 19 files changed, 348 insertions(+), 63 deletions(-) create mode 100644 drivers/acpi/dbg2.c create mode 100644 include/linux/acpi_dbg2.h -- 2.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
