From: Yazen Ghannam <yazen.ghannam@amd.com>
To: Lin Wang <wanglin@open-hieco.net>
Cc: Borislav Petkov <bp@alien8.de>,
Mario Limonciello <mario.limonciello@amd.com>,
Pu Wen <puwen@hygon.cn>, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Tony Luck <tony.luck@intel.com>,
x86@kernel.org, linux-edac@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 7/7] x86/hygon: Add Family 0x18 SMN access
Date: Wed, 4 Nov 2026 12:16:54 -0500 [thread overview]
Message-ID: <20261104171654.GF716491@yaz-khff2.amd.com> (raw)
In-Reply-To: <20261029053313.46323-8-wanglin@open-hieco.net>
On Thu, Oct 29, 2026 at 01:33:13PM +0800, Lin Wang wrote:
> All DF nodes in a Hygon socket share one SMN ingress, so SMN accesses
> for a node have to go through a root of the node's socket rather than a
> root per node.
>
> After DF enumeration, map each DF node to the first root of its socket.
> The roots do not expose their socket IDs, so group them by socket in
> PCI enumeration order. Each DF node holds its own reference to its
> socket's root. Keep config space reserved on all roots for the lifetime
> of the node layer and free the temporary root table after setup.
>
> Serialize each index/data transaction. A setup failure releases all
> acquired resources without invalidating the DF node cache.
>
> Hygon drivers such as EDAC need SMN access. Keep the SMN read and write
> helpers local to hygon_node.c until such drivers are added.
>
> Signed-off-by: Lin Wang <wanglin@open-hieco.net>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Thanks,
Yazen
prev parent reply other threads:[~2026-11-04 17:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-29 5:33 [PATCH v9 0/7] x86/hygon: Add Family 0x18 DF node enumeration and " Lin Wang
2026-10-29 5:33 ` [PATCH v9 1/7] x86/hygon: Add Family 0x18 DF node enumeration Lin Wang
2026-10-29 5:33 ` [PATCH v9 2/7] x86/hygon: Map CPU NodeIds to DF nodes Lin Wang
2026-10-29 5:33 ` [PATCH v9 3/7] EDAC/amd64: Stop matching Hygon CPUs Lin Wang
2026-10-29 5:33 ` [PATCH v9 4/7] RAS/AMD/ATL: Match AMD CPUs only Lin Wang
2026-10-29 5:33 ` [PATCH v9 5/7] x86/amd_nb: Restrict the northbridge framework to AMD CPUs Lin Wang
2026-10-29 5:33 ` [PATCH v9 6/7] x86/amd_node: Restrict SMN setup " Lin Wang
2026-10-29 5:33 ` [PATCH v9 7/7] x86/hygon: Add Family 0x18 SMN access Lin Wang
2026-11-04 17:16 ` Yazen Ghannam [this message]
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