| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <4af676a8-26f1-0e1b-5e7f-1ca4824d56fb@huawei.com>
Date: Wed, 17 Dec 2025 09:25:46 +0800
From: Hanjun Guo <guohanjun@...wei.com>
To: Shuai Xue <xueshuai@...ux.alibaba.com>, <tony.luck@...el.com>,
<mchehab@...nel.org>, <yazen.ghannam@....com>
CC: <dave.jiang@...el.com>, <Smita.KoralahalliChannabasappa@....com>,
<leitao@...ian.org>, <pengdonglin@...omi.com>,
<baolin.wang@...ux.alibaba.com>, <benjamin.cheatham@....com>, <bp@...en8.de>,
<dan.j.williams@...el.com>, <james.morse@....com>, <lenb@...nel.org>,
<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<rafael@...nel.org>, <zhuo.song@...ux.alibaba.com>
Subject: Re: [PATCH 2/3] ACPI: APEI: GHES: Extract helper functions for error
status handling
On 2025/12/3 21:02, Shuai Xue wrote:
> Refactors the GHES driver by extracting common functionality into
> reusable helper functions:
>
> 1. ghes_has_active_errors() - Checks if any error sources in a given list
> have active errors
> 2. ghes_map_error_status() - Maps error status address to virtual address
> 3. ghes_unmap_error_status() - Unmaps error status virtual address
>
> These helpers eliminate code duplication in the NMI path and prepare for
> similar usage in the SEA path in a subsequent patch.
>
> No functional change intended.
>
> Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
> ---
> drivers/acpi/apei/ghes.c | 92 +++++++++++++++++++++++++++++++---------
> 1 file changed, 72 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 62713b612865..2c7f3ca6ce50 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -1375,6 +1375,74 @@ static int ghes_in_nmi_spool_from_list(struct list_head *rcu_list,
> return ret;
> }
>
> +/**
> + * ghes_has_active_errors - Check if there are active errors in error sources
> + * @ghes_list: List of GHES entries to check for active errors
> + *
> + * This function iterates through all GHES entries in the given list and
> + * checks if any of them has active error status by reading the error
> + * status register.
> + *
> + * Return: true if at least one source has active error, false otherwise.
> + */
> +static bool __maybe_unused ghes_has_active_errors(struct list_head *ghes_list)
> +{
> + bool active_error = false;
> + struct ghes *ghes;
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(ghes, ghes_list, list) {
> + if (ghes->error_status_vaddr &&
> + readl(ghes->error_status_vaddr)) {
> + active_error = true;
> + break;
> + }
> + }
> + rcu_read_unlock();
> +
> + return active_error;
> +}
> +
> +/**
> + * ghes_map_error_status - Map error status address to virtual address
> + * @ghes: pointer to GHES structure
> + *
> + * Reads the error status address from ACPI HEST table and maps it to a virtual
> + * address that can be accessed by the kernel.
> + *
> + * Return: 0 on success, error code on failure.
> + */
> +static int __maybe_unused ghes_map_error_status(struct ghes *ghes)
> +{
> + struct acpi_hest_generic *g = ghes->generic;
> + u64 paddr;
> + int rc;
> +
> + rc = apei_read(&paddr, &g->error_status_address);
> + if (rc)
> + return rc;
> + ghes->error_status_vaddr =
> + acpi_os_ioremap(paddr, sizeof(ghes->estatus->block_status));
> + if (!ghes->error_status_vaddr)
> + return AE_BAD_ADDRESS;
Same update here.
> +
> + return 0;
> +}
> +
> +/**
> + * ghes_unmap_error_status - Unmap error status virtual address
> + * @ghes: pointer to GHES structure
> + *
> + * Unmaps the error status address if it was previously mapped.
> + */
> +static void __maybe_unused ghes_unmap_error_status(struct ghes *ghes)
> +{
> + if (ghes->error_status_vaddr) {
> + iounmap(ghes->error_status_vaddr);
> + ghes->error_status_vaddr = NULL;
> + }
> +}
> +
> #ifdef CONFIG_ACPI_APEI_SEA
> static LIST_HEAD(ghes_sea);
>
> @@ -1425,20 +1493,9 @@ static LIST_HEAD(ghes_nmi);
> static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
> {
> static DEFINE_RAW_SPINLOCK(ghes_notify_lock_nmi);
> - bool active_error = false;
> int ret = NMI_DONE;
> - struct ghes *ghes;
>
> - rcu_read_lock();
> - list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
> - if (ghes->error_status_vaddr && readl(ghes->error_status_vaddr)) {
> - active_error = true;
> - break;
> - }
> - }
> - rcu_read_unlock();
> -
> - if (!active_error)
> + if (!ghes_has_active_errors(&ghes_nmi))
> return ret;
>
> if (!atomic_add_unless(&ghes_in_nmi, 1, 1))
> @@ -1455,16 +1512,11 @@ static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
>
> static int ghes_nmi_add(struct ghes *ghes)
> {
> - struct acpi_hest_generic *g = ghes->generic;
> - u64 paddr;
> int rc;
>
> - rc = apei_read(&paddr, &g->error_status_address);
> + rc = ghes_map_error_status(ghes);
> if (rc)
> return rc;
> - ghes->error_status_vaddr = acpi_os_ioremap(paddr, sizeof(ghes->estatus->block_status));
> - if (!ghes->error_status_vaddr)
> - return AE_BAD_ADDRESS;
>
> mutex_lock(&ghes_list_mutex);
> if (list_empty(&ghes_nmi))
> @@ -1483,8 +1535,7 @@ static void ghes_nmi_remove(struct ghes *ghes)
> unregister_nmi_handler(NMI_LOCAL, "ghes");
> mutex_unlock(&ghes_list_mutex);
>
> - if (ghes->error_status_vaddr)
> - iounmap(ghes->error_status_vaddr);
> + ghes_unmap_error_status(ghes);
>
> /*
> * To synchronize with NMI handler, ghes can only be
> @@ -1492,6 +1543,7 @@ static void ghes_nmi_remove(struct ghes *ghes)
> */
> synchronize_rcu();
> }
> +
I think it's not belong to this patch.
Thanks
Hanjun
> #else /* CONFIG_HAVE_ACPI_APEI_NMI */
> static inline int ghes_nmi_add(struct ghes *ghes) { return -EINVAL; }
> static inline void ghes_nmi_remove(struct ghes *ghes) { }
>
Powered by blists - more mailing lists