From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 464921B012B; Wed, 25 Sep 2024 11:40:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727264426; cv=none; b=k9hQLnl5I1kUBKXxrd1VogoqNEWj0k7ql3sjFqURoQp23DAvnpKm+JMbpcjyv2/K/mFCohxsXbTB9NjIe0mVJmyMLNWoLsqWpHqGPzDzpVN+a+1vbfCG639TSQMo9lAUgePkvlc9tHBXNuV4BuO+31hLa2yKkUyWFULQBFiSpVw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727264426; c=relaxed/simple; bh=eY6CaTPrbIw6JVjRw/wi01WOdt7z8xWaDckHtDFr7WI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OjvnUwi/M2MUQFL2WoLjFdYfxbesMTCrc/8rdvT/BBSZX6p0H952+CeJS7EheoFlPfTY1QT7JUWkSEZNjwec1VX6Y7uOmlsxKdJ18Vqcs5CKG58AgcA7ygbaM230Uq2xE6uRp3ONdpqXLPeXNAEfOVqCI6Y2D0RlzVO9/nLKlqM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HjMk2jse; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HjMk2jse" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8FB1C4CEC3; Wed, 25 Sep 2024 11:40:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727264426; bh=eY6CaTPrbIw6JVjRw/wi01WOdt7z8xWaDckHtDFr7WI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HjMk2jse3IRD6aUPFpp5s996fCx/nsmEOwZwjSCNmZ+wm1mixM9xD0fvty8rERQZq pql3EGprOn95Yydb+I31uPz6EzRR7bjA7B4Hfrc1QxWLJXRg5rj+9A25G1VL4RBdB7 nLIfH9qfSVsgFGtHKzFgbL5o2pefGcf99fvhgj7AgmoPxR8Uz8C6kimgAw/sngODTF 6g5iKLXBO5lhy2iuEEJh8qHI6vuPYyO0lCdGaYg6RB29xNApP2YQTaa85oRkooFejh AUdc22uLkkzfVEeibCk48ELRAMT90utacf9UNwsFk/pUbzDT0vU7O5OyR2dBd+O82W y0Kpg/sMVvZcA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thomas Gleixner , Breno Leitao , Qiuxu Zhuo , Sasha Levin , mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, ahuang12@lenovo.com, maz@kernel.org Subject: [PATCH AUTOSEL 6.11 089/244] x86/ioapic: Handle allocation failures gracefully Date: Wed, 25 Sep 2024 07:25:10 -0400 Message-ID: <20240925113641.1297102-89-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240925113641.1297102-1-sashal@kernel.org> References: <20240925113641.1297102-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.11 Content-Transfer-Encoding: 8bit From: Thomas Gleixner [ Upstream commit 830802a0fea8fb39d3dc9fb7d6b5581e1343eb1f ] Breno observed panics when using failslab under certain conditions during runtime: can not alloc irq_pin_list (-1,0,20) Kernel panic - not syncing: IO-APIC: failed to add irq-pin. Can not proceed panic+0x4e9/0x590 mp_irqdomain_alloc+0x9ab/0xa80 irq_domain_alloc_irqs_locked+0x25d/0x8d0 __irq_domain_alloc_irqs+0x80/0x110 mp_map_pin_to_irq+0x645/0x890 acpi_register_gsi_ioapic+0xe6/0x150 hpet_open+0x313/0x480 That's a pointless panic which is a leftover of the historic IO/APIC code which panic'ed during early boot when the interrupt allocation failed. The only place which might justify panic is the PIT/HPET timer_check() code which tries to figure out whether the timer interrupt is delivered through the IO/APIC. But that code does not require to handle interrupt allocation failures. If the interrupt cannot be allocated then timer delivery fails and it either panics due to that or falls back to legacy mode. Cure this by removing the panic wrapper around __add_pin_to_irq_node() and making mp_irqdomain_alloc() aware of the failure condition and handle it as any other failure in this function gracefully. Reported-by: Breno Leitao Signed-off-by: Thomas Gleixner Tested-by: Breno Leitao Tested-by: Qiuxu Zhuo Link: https://lore.kernel.org/all/ZqfJmUF8sXIyuSHN@gmail.com Link: https://lore.kernel.org/all/20240802155440.275200843@linutronix.de Signed-off-by: Sasha Levin --- arch/x86/kernel/apic/io_apic.c | 46 ++++++++++++++++------------------ 1 file changed, 22 insertions(+), 24 deletions(-) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 477b740b2f267..d1ec1dcb637af 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -352,27 +352,26 @@ static void ioapic_mask_entry(int apic, int pin) * shared ISA-space IRQs, so we have to support them. We are super * fast in the common case, and fast for shared ISA-space IRQs. */ -static int __add_pin_to_irq_node(struct mp_chip_data *data, - int node, int apic, int pin) +static bool add_pin_to_irq_node(struct mp_chip_data *data, int node, int apic, int pin) { struct irq_pin_list *entry; - /* don't allow duplicates */ - for_each_irq_pin(entry, data->irq_2_pin) + /* Don't allow duplicates */ + for_each_irq_pin(entry, data->irq_2_pin) { if (entry->apic == apic && entry->pin == pin) - return 0; + return true; + } entry = kzalloc_node(sizeof(struct irq_pin_list), GFP_ATOMIC, node); if (!entry) { - pr_err("can not alloc irq_pin_list (%d,%d,%d)\n", - node, apic, pin); - return -ENOMEM; + pr_err("Cannot allocate irq_pin_list (%d,%d,%d)\n", node, apic, pin); + return false; } + entry->apic = apic; entry->pin = pin; list_add_tail(&entry->list, &data->irq_2_pin); - - return 0; + return true; } static void __remove_pin_from_irq(struct mp_chip_data *data, int apic, int pin) @@ -387,13 +386,6 @@ static void __remove_pin_from_irq(struct mp_chip_data *data, int apic, int pin) } } -static void add_pin_to_irq_node(struct mp_chip_data *data, - int node, int apic, int pin) -{ - if (__add_pin_to_irq_node(data, node, apic, pin)) - panic("IO-APIC: failed to add irq-pin. Can not proceed\n"); -} - /* * Reroute an IRQ to a different pin. */ @@ -1002,8 +994,7 @@ static int alloc_isa_irq_from_domain(struct irq_domain *domain, if (irq_data && irq_data->parent_data) { if (!mp_check_pin_attr(irq, info)) return -EBUSY; - if (__add_pin_to_irq_node(irq_data->chip_data, node, ioapic, - info->ioapic.pin)) + if (!add_pin_to_irq_node(irq_data->chip_data, node, ioapic, info->ioapic.pin)) return -ENOMEM; } else { info->flags |= X86_IRQ_ALLOC_LEGACY; @@ -3017,10 +3008,8 @@ int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq, return -ENOMEM; ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info); - if (ret < 0) { - kfree(data); - return ret; - } + if (ret < 0) + goto free_data; INIT_LIST_HEAD(&data->irq_2_pin); irq_data->hwirq = info->ioapic.pin; @@ -3029,7 +3018,10 @@ int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq, irq_data->chip_data = data; mp_irqdomain_get_attr(mp_pin_to_gsi(ioapic, pin), data, info); - add_pin_to_irq_node(data, ioapic_alloc_attr_node(info), ioapic, pin); + if (!add_pin_to_irq_node(data, ioapic_alloc_attr_node(info), ioapic, pin)) { + ret = -ENOMEM; + goto free_irqs; + } mp_preconfigure_entry(data); mp_register_handler(virq, data->is_level); @@ -3044,6 +3036,12 @@ int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq, ioapic, mpc_ioapic_id(ioapic), pin, virq, data->is_level, data->active_low); return 0; + +free_irqs: + irq_domain_free_irqs_parent(domain, virq, nr_irqs); +free_data: + kfree(data); + return ret; } void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq, -- 2.43.0