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[217.140.101.70]) by mx.google.com with ESMTP id e18-v6si11564312oii.45.2018.09.21.15.18.27 for ; Fri, 21 Sep 2018 15:18:27 -0700 (PDT) Received-SPF: pass (google.com: domain of james.morse@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of james.morse@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=james.morse@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1C3E01684; Fri, 21 Sep 2018 15:18:27 -0700 (PDT) Received: from melchizedek.Emea.Arm.com (melchizedek.emea.arm.com [10.4.12.81]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 071723F557; Fri, 21 Sep 2018 15:18:23 -0700 (PDT) From: James Morse To: linux-acpi@vger.kernel.org Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, Borislav Petkov , Marc Zyngier , Christoffer Dall , Will Deacon , Catalin Marinas , Naoya Horiguchi , Rafael Wysocki , Len Brown , Tony Luck , Tyler Baicar , Dongjiu Geng , Xie XiuQi , Punit Agrawal , jonathan.zhang@cavium.com, James Morse Subject: [PATCH v6 10/18] ACPI / APEI: preparatory split of ghes->estatus Date: Fri, 21 Sep 2018 23:16:57 +0100 Message-Id: <20180921221705.6478-11-james.morse@arm.com> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20180921221705.6478-1-james.morse@arm.com> References: <20180921221705.6478-1-james.morse@arm.com> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP The NMI-like notifications scribble over ghes->estatus, before copying it somewhere else. If this interrupts the ghes_probe() code calling ghes_proc() on each struct ghes, the data is corrupted. We want the NMI-like notifications to use a queued estatus entry from the beginning. To that end, break up any use of "ghes->estatus" so that all functions take the estatus as an argument. This patch is just moving code around, no change in behaviour. Signed-off-by: James Morse --- drivers/acpi/apei/ghes.c | 82 ++++++++++++++++++++++------------------ 1 file changed, 45 insertions(+), 37 deletions(-) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index adf7fd402813..586689cbc0fd 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -298,7 +298,9 @@ static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len, } } -static int ghes_read_estatus(struct ghes *ghes, int silent, int fixmap_idx) +static int ghes_read_estatus(struct ghes *ghes, + struct acpi_hest_generic_status *estatus, + int silent, int fixmap_idx) { struct acpi_hest_generic *g = ghes->generic; u64 buf_paddr; @@ -316,26 +318,26 @@ static int ghes_read_estatus(struct ghes *ghes, int silent, int fixmap_idx) if (!buf_paddr) return -ENOENT; - ghes_copy_tofrom_phys(ghes->estatus, buf_paddr, - sizeof(*ghes->estatus), 1, fixmap_idx); - if (!ghes->estatus->block_status) + ghes_copy_tofrom_phys(estatus, buf_paddr, + sizeof(*estatus), 1, fixmap_idx); + if (!estatus->block_status) return -ENOENT; ghes->buffer_paddr = buf_paddr; ghes->flags |= GHES_TO_CLEAR; rc = -EIO; - len = cper_estatus_len(ghes->estatus); - if (len < sizeof(*ghes->estatus)) + len = cper_estatus_len(estatus); + if (len < sizeof(*estatus)) goto err_read_block; if (len > ghes->generic->error_block_length) goto err_read_block; - if (cper_estatus_check_header(ghes->estatus)) + if (cper_estatus_check_header(estatus)) goto err_read_block; - ghes_copy_tofrom_phys(ghes->estatus + 1, - buf_paddr + sizeof(*ghes->estatus), - len - sizeof(*ghes->estatus), 1, fixmap_idx); - if (cper_estatus_check(ghes->estatus)) + ghes_copy_tofrom_phys(estatus + 1, + buf_paddr + sizeof(*estatus), + len - sizeof(*estatus), 1, fixmap_idx); + if (cper_estatus_check(estatus)) goto err_read_block; rc = 0; @@ -346,13 +348,15 @@ static int ghes_read_estatus(struct ghes *ghes, int silent, int fixmap_idx) return rc; } -static void ghes_clear_estatus(struct ghes *ghes, int fixmap_idx) +static void ghes_clear_estatus(struct ghes *ghes, + struct acpi_hest_generic_status *estatus, + int fixmap_idx) { - ghes->estatus->block_status = 0; + estatus->block_status = 0; if (!(ghes->flags & GHES_TO_CLEAR)) return; - ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr, - sizeof(ghes->estatus->block_status), 0, fixmap_idx); + ghes_copy_tofrom_phys(estatus, ghes->buffer_paddr, + sizeof(estatus->block_status), 0, fixmap_idx); ghes->flags &= ~GHES_TO_CLEAR; } @@ -518,9 +522,10 @@ static int ghes_print_estatus(const char *pfx, return 0; } -static void __ghes_panic(struct ghes *ghes) +static void __ghes_panic(struct ghes *ghes, + struct acpi_hest_generic_status *estatus) { - __ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus); + __ghes_print_estatus(KERN_EMERG, ghes->generic, estatus); /* reboot to log the error! */ if (!panic_timeout) @@ -695,16 +700,17 @@ static void ghes_print_queued_estatus(void) } /* Save estatus for further processing in IRQ context */ -static void __process_error(struct ghes *ghes) +static void __process_error(struct ghes *ghes, + struct acpi_hest_generic_status *ghes_estatus) { u32 len, node_len; struct ghes_estatus_node *estatus_node; struct acpi_hest_generic_status *estatus; - if (ghes_estatus_cached(ghes->estatus)) + if (ghes_estatus_cached(ghes_estatus)) return; - len = cper_estatus_len(ghes->estatus); + len = cper_estatus_len(ghes_estatus); node_len = GHES_ESTATUS_NODE_LEN(len); estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool, node_len); @@ -714,35 +720,37 @@ static void __process_error(struct ghes *ghes) estatus_node->ghes = ghes; estatus_node->generic = ghes->generic; estatus = GHES_ESTATUS_FROM_NODE(estatus_node); - memcpy(estatus, ghes->estatus, len); + memcpy(estatus, ghes_estatus, len); llist_add(&estatus_node->llnode, &ghes_estatus_llist); } static int _in_nmi_notify_one(struct ghes *ghes, int fixmap_idx) { int sev; + struct acpi_hest_generic_status *estatus = ghes->estatus; - if (ghes_read_estatus(ghes, 1, fixmap_idx)) { - ghes_clear_estatus(ghes, fixmap_idx); + if (ghes_read_estatus(ghes, estatus, 1, fixmap_idx)) { + ghes_clear_estatus(ghes, estatus, fixmap_idx); return -ENOENT; } - sev = ghes_severity(ghes->estatus->error_severity); + sev = ghes_severity(estatus->error_severity); if (sev >= GHES_SEV_PANIC) { ghes_print_queued_estatus(); - __ghes_panic(ghes); + __ghes_panic(ghes, estatus); } if (!(ghes->flags & GHES_TO_CLEAR)) return 0; - __process_error(ghes); - ghes_clear_estatus(ghes, fixmap_idx); + __process_error(ghes, estatus); + ghes_clear_estatus(ghes, estatus, fixmap_idx); return 0; } -static int ghes_estatus_queue_notified(struct list_head *rcu_list, int fixmap_idx) +static int ghes_estatus_queue_notified(struct list_head *rcu_list, + int fixmap_idx) { int ret = -ENOENT; struct ghes *ghes; @@ -853,23 +861,23 @@ static int ghes_ack_error(struct acpi_hest_generic_v2 *gv2) static int ghes_proc(struct ghes *ghes) { int rc; + struct acpi_hest_generic_status *estatus = ghes->estatus; - rc = ghes_read_estatus(ghes, 0, FIX_APEI_GHES_IRQ); + rc = ghes_read_estatus(ghes, estatus, 0, FIX_APEI_GHES_IRQ); if (rc) goto out; - if (ghes_severity(ghes->estatus->error_severity) >= GHES_SEV_PANIC) { - __ghes_panic(ghes); - } + if (ghes_severity(estatus->error_severity) >= GHES_SEV_PANIC) + __ghes_panic(ghes, estatus); - if (!ghes_estatus_cached(ghes->estatus)) { - if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus)) - ghes_estatus_cache_add(ghes->generic, ghes->estatus); + if (!ghes_estatus_cached(estatus)) { + if (ghes_print_estatus(NULL, ghes->generic, estatus)) + ghes_estatus_cache_add(ghes->generic, estatus); } - ghes_do_proc(ghes, ghes->estatus); + ghes_do_proc(ghes, estatus); out: - ghes_clear_estatus(ghes, FIX_APEI_GHES_IRQ); + ghes_clear_estatus(ghes, estatus, FIX_APEI_GHES_IRQ); if (rc == -ENOENT) return rc;