From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1525100188; cv=none; d=google.com; s=arc-20160816; b=EFvcC7nHgyOmoOnAve2TYLS/CMIJsPNUCCXz0Zx5YQ59RyRirIKyVVwFEkS16LTEnD FnMyYLA3hqu4GiTCwXSJIKF9AQ37wU/GRPZlwturRDyw6efEKV6V7vUMUQZwRdsurIEA mgYb3ERcu5lorpjZkJePFbNcfcKKR6RYGZ5Z9XzFAjo+FO9cLwNGg+bzfmUCSB1wD36h 13GgwQX3j94WqdDiQc3Z6mEkgMbRbS8pFlEFnqG+S+Xx8StscuOSRMCmzGb8TdeiEQEr U/cCIMMzvo9R8mW1wR9rzICvqo1ACwY1IjJQqRfFleEKKQOJKtOvOFNCBcgLNYjz7xP1 LkKQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:arc-authentication-results; bh=9VWdaNcBe168QUlocAIIDT1HHLHdwjg/FSD6ADUNg4g=; b=oDB+BpcLSEhPXhWuCNxkipr5abdDaWFuaWERr+OzD92kXIxmebTkltGVLC+ubPtVZ8 i+41Fsm4zqpilCkTZleaEeKSwHLg58CJqixZ8GsW+HeDWRwh2/uzc53yYFyrIVtvw197 eVaL/kbrZdlyNcFZLB41gUI1foHXnKSVsUztAfB6prv0w+cX5NcIW3o70D4vzbNKcyO6 srVHtw+ngE/EjyJR1kBezlyOV0KXlZ2cNFQBl2jZ3BVN9ZLliy22r0oPetORtsp5MHjQ dE3eoO8vcuSQvc+tf58jf6YtF1mwPUy7LObr6TwKvGPpNUqwVKog90pFIvb7xJxENGEf zStQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=JgBw+ZRu; spf=pass (google.com: domain of npiggin@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=npiggin@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=JgBw+ZRu; spf=pass (google.com: domain of npiggin@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=npiggin@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com X-Google-Smtp-Source: AB8JxZpf2QF+3m5iqP1YRWcDhznfPJ+jYWBs9v80FNoL+L4LOt7XhS6GbES1zRdgc4xRCzNKD8XwxA== From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Cc: Nicholas Piggin , Benjamin Herrenschmidt , Greg Kroah-Hartman , Jiri Slaby , linux-kernel@vger.kernel.org Subject: [PATCH 05/15] powerpc/powernv: Implement and use opal_flush_console Date: Tue, 1 May 2018 00:55:48 +1000 Message-Id: <20180430145558.4308-6-npiggin@gmail.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180430145558.4308-1-npiggin@gmail.com> References: <20180430145558.4308-1-npiggin@gmail.com> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1599183455187134168?= X-GMAIL-MSGID: =?utf-8?q?1599183455187134168?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: A new console flushing firmware API was introduced to replace event polling loops, and implemented in opal-kmsg with affddff69c55e ("powerpc/powernv: Add a kmsg_dumper that flushes console output on panic"), to flush the console in the panic path. The OPAL console driver has other situations where interrupts are off and it needs to flush the console synchronously. These still use a polling loop. So move the opal-kmsg flush code to opal_flush_console, and use the new function in opal-kmsg and opal_put_chars. Cc: Benjamin Herrenschmidt Reviewed-by: Russell Currey Signed-off-by: Nicholas Piggin --- arch/powerpc/include/asm/opal.h | 1 + arch/powerpc/platforms/powernv/opal-kmsg.c | 35 ++---------------- arch/powerpc/platforms/powernv/opal.c | 42 +++++++++++++++++++--- 3 files changed, 42 insertions(+), 36 deletions(-) diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index 03e1a920491e..bbff49fab0e5 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -303,6 +303,7 @@ extern void opal_configure_cores(void); extern int opal_get_chars(uint32_t vtermno, char *buf, int count); extern int opal_put_chars(uint32_t vtermno, const char *buf, int total_len); +extern int opal_flush_console(uint32_t vtermno); extern void hvc_opal_init_early(void); diff --git a/arch/powerpc/platforms/powernv/opal-kmsg.c b/arch/powerpc/platforms/powernv/opal-kmsg.c index fd2bbf4fd6dc..55691950d981 100644 --- a/arch/powerpc/platforms/powernv/opal-kmsg.c +++ b/arch/powerpc/platforms/powernv/opal-kmsg.c @@ -12,7 +12,6 @@ */ #include -#include #include #include @@ -24,11 +23,9 @@ * may not be completely printed. This function does not actually dump the * message, it just ensures that OPAL completely flushes the console buffer. */ -static void force_opal_console_flush(struct kmsg_dumper *dumper, +static void kmsg_dump_opal_console_flush(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason) { - s64 rc; - /* * Outside of a panic context the pollers will continue to run, * so we don't need to do any special flushing. @@ -36,37 +33,11 @@ static void force_opal_console_flush(struct kmsg_dumper *dumper, if (reason != KMSG_DUMP_PANIC) return; - if (opal_check_token(OPAL_CONSOLE_FLUSH)) { - do { - rc = OPAL_BUSY; - while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { - rc = opal_console_flush(0); - if (rc == OPAL_BUSY_EVENT) { - mdelay(OPAL_BUSY_DELAY_MS); - opal_poll_events(NULL); - } else if (rc == OPAL_BUSY) { - mdelay(OPAL_BUSY_DELAY_MS); - } - } - } while (rc == OPAL_PARTIAL); /* More to flush */ - - } else { - __be64 evt; - - WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); - /* - * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, - * the console can still be flushed by calling the polling - * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. - */ - do { - opal_poll_events(&evt); - } while (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT); - } + opal_flush_console(0); } static struct kmsg_dumper opal_kmsg_dumper = { - .dump = force_opal_console_flush + .dump = kmsg_dump_opal_console_flush }; void __init opal_kmsg_init(void) diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 6b621d47ac29..6640fccbf30c 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -350,7 +350,6 @@ int opal_put_chars(uint32_t vtermno, const char *data, int total_len) __be64 olen; s64 len, rc; unsigned long flags; - __be64 evt; if (!opal.entry) return -ENODEV; @@ -371,7 +370,7 @@ int opal_put_chars(uint32_t vtermno, const char *data, int total_len) /* Closed -> drop characters */ if (rc) return total_len; - opal_poll_events(NULL); + opal_flush_console(vtermno); return -EAGAIN; } @@ -410,12 +409,47 @@ int opal_put_chars(uint32_t vtermno, const char *data, int total_len) * things a bit later to limit that to synchronous path * such as the kernel console and xmon/udbg */ + opal_flush_console(vtermno); + } + spin_unlock_irqrestore(&opal_write_lock, flags); + + return written; +} + +int opal_flush_console(uint32_t vtermno) +{ + s64 rc; + + if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { + __be64 evt; + + WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); + /* + * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, + * the console can still be flushed by calling the polling + * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. + */ do { opal_poll_events(&evt); } while (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT); + + return OPAL_SUCCESS; } - spin_unlock_irqrestore(&opal_write_lock, flags); - return written; + + do { + rc = OPAL_BUSY; + while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { + rc = opal_console_flush(vtermno); + if (rc == OPAL_BUSY_EVENT) { + mdelay(OPAL_BUSY_DELAY_MS); + opal_poll_events(NULL); + } else if (rc == OPAL_BUSY) { + mdelay(OPAL_BUSY_DELAY_MS); + } + } + } while (rc == OPAL_PARTIAL); /* More to flush */ + + return opal_error_code(rc); } static int opal_recover_mce(struct pt_regs *regs, -- 2.17.0