diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/809-jailhouse-0020-jailhouse-Add-simple-debug-console-via-the-hyperviso.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/809-jailhouse-0020-jailhouse-Add-simple-debug-console-via-the-hyperviso.patch | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/target/linux/layerscape/patches-5.4/809-jailhouse-0020-jailhouse-Add-simple-debug-console-via-the-hyperviso.patch b/target/linux/layerscape/patches-5.4/809-jailhouse-0020-jailhouse-Add-simple-debug-console-via-the-hyperviso.patch deleted file mode 100644 index d3fb53ec58..0000000000 --- a/target/linux/layerscape/patches-5.4/809-jailhouse-0020-jailhouse-Add-simple-debug-console-via-the-hyperviso.patch +++ /dev/null @@ -1,164 +0,0 @@ -From 58d058f1fe1cc5981c57be8b48d3b2f74f25c0d6 Mon Sep 17 00:00:00 2001 -From: Jan Kiszka <jan.kiszka@siemens.com> -Date: Sun, 11 Sep 2016 23:30:04 +0200 -Subject: [PATCH] jailhouse: Add simple debug console via the hypervisor - -Jailhouse allows explicitly enabled cells to write character-wise -messages to the hypervisor debug console. Make use of this for a -platform-agnostic boot diagnosis channel, specifically for non-root -cells. This also comes with earlycon support. - -Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> -(cherry picked from commit 60685bd589aef4972d20724863079edf2039eaa2) -From http://git.kiszka.org/?p=linux.git;a=shortlog;h=refs/heads/queues/jailhouse ---- - MAINTAINERS | 1 + - drivers/virt/Kconfig | 11 +++++ - drivers/virt/Makefile | 1 + - drivers/virt/jailhouse_dbgcon.c | 103 ++++++++++++++++++++++++++++++++++++++++ - 4 files changed, 116 insertions(+) - create mode 100644 drivers/virt/jailhouse_dbgcon.c - ---- a/MAINTAINERS -+++ b/MAINTAINERS -@@ -8774,6 +8774,7 @@ L: jailhouse-dev@googlegroups.com - S: Maintained - F: arch/x86/kernel/jailhouse.c - F: arch/x86/include/asm/jailhouse_para.h -+F: drivers/virt/jailhouse_dbgcon.c - - JC42.4 TEMPERATURE SENSOR DRIVER - M: Guenter Roeck <linux@roeck-us.net> ---- a/drivers/virt/Kconfig -+++ b/drivers/virt/Kconfig -@@ -31,5 +31,16 @@ config FSL_HV_MANAGER - 4) A kernel interface for receiving callbacks when a managed - partition shuts down. - -+config JAILHOUSE_DBGCON -+ tristate "Jailhouse console driver" -+ depends on X86 || ARM || ARM64 -+ help -+ The Jailhouse hypervisor provides a simple write-only console for -+ debugging the bootstrap process of its cells. This driver registers -+ a console with the kernel to make use of it. -+ -+ Note that Jailhouse has to be configured to permit a cell the usage -+ of the console interface. -+ - source "drivers/virt/vboxguest/Kconfig" - endif ---- a/drivers/virt/Makefile -+++ b/drivers/virt/Makefile -@@ -4,4 +4,5 @@ - # - - obj-$(CONFIG_FSL_HV_MANAGER) += fsl_hypervisor.o -+obj-$(CONFIG_JAILHOUSE_DBGCON) += jailhouse_dbgcon.o - obj-y += vboxguest/ ---- /dev/null -+++ b/drivers/virt/jailhouse_dbgcon.c -@@ -0,0 +1,103 @@ -+/* SPDX-License-Identifier: GPL-2.0 */ -+/* -+ * Console driver for running over the Jailhouse partitioning hypervisor -+ * -+ * Copyright (c) Siemens AG, 2016-2018 -+ * -+ * Authors: -+ * Jan Kiszka <jan.kiszka@siemens.com> -+ */ -+ -+#include <linux/console.h> -+#include <linux/hypervisor.h> -+#include <linux/module.h> -+#include <linux/serial_core.h> -+#ifdef CONFIG_X86 -+#include <asm/alternative.h> -+#endif -+#ifdef CONFIG_ARM -+#include <asm/opcodes-virt.h> -+#endif -+ -+#define JAILHOUSE_HC_DEBUG_CONSOLE_PUTC 8 -+ -+static void hypervisor_putc(char c) -+{ -+#if defined(CONFIG_X86) -+ int result; -+ -+ asm volatile( -+ ALTERNATIVE(".byte 0x0f,0x01,0xc1", ".byte 0x0f,0x01,0xd9", -+ X86_FEATURE_VMMCALL) -+ : "=a" (result) -+ : "a" (JAILHOUSE_HC_DEBUG_CONSOLE_PUTC), "D" (c) -+ : "memory"); -+#elif defined(CONFIG_ARM) -+ register u32 num_res asm("r0") = JAILHOUSE_HC_DEBUG_CONSOLE_PUTC; -+ register u32 arg1 asm("r1") = c; -+ -+ asm volatile( -+ __HVC(0x4a48) -+ : "=r" (num_res) -+ : "r" (num_res), "r" (arg1) -+ : "memory"); -+#elif defined(CONFIG_ARM64) -+ register u64 num_res asm("x0") = JAILHOUSE_HC_DEBUG_CONSOLE_PUTC; -+ register u64 arg1 asm("x1") = c; -+ -+ asm volatile( -+ "hvc #0x4a48\n\t" -+ : "=r" (num_res) -+ : "r" (num_res), "r" (arg1) -+ : "memory"); -+#else -+#error Unsupported architecture. -+#endif -+} -+ -+static void jailhouse_dbgcon_write(struct console *con, const char *s, -+ unsigned count) -+{ -+ while (count > 0) { -+ hypervisor_putc(*s); -+ count--; -+ s++; -+ } -+} -+ -+static int __init early_jailhouse_dbgcon_setup(struct earlycon_device *device, -+ const char *options) -+{ -+ device->con->write = jailhouse_dbgcon_write; -+ return 0; -+} -+ -+EARLYCON_DECLARE(jailhouse, early_jailhouse_dbgcon_setup); -+ -+static struct console jailhouse_dbgcon = { -+ .name = "jailhouse", -+ .write = jailhouse_dbgcon_write, -+ .flags = CON_PRINTBUFFER | CON_ANYTIME, -+ .index = -1, -+}; -+ -+static int __init jailhouse_dbgcon_init(void) -+{ -+ if (!jailhouse_paravirt()) -+ return -ENODEV; -+ -+ register_console(&jailhouse_dbgcon); -+ return 0; -+} -+ -+static void __exit jailhouse_dbgcon_exit(void) -+{ -+ unregister_console(&jailhouse_dbgcon); -+} -+ -+module_init(jailhouse_dbgcon_init); -+module_exit(jailhouse_dbgcon_exit); -+ -+MODULE_LICENSE("GPL v2"); -+MODULE_DESCRIPTION("Jailhouse debug console driver"); -+MODULE_AUTHOR("Jan Kiszka <jan.kiszka@siemens.com>"); |