From: "Arnd Bergmann" <arnd@arndb.de>
To: "Stewart Hildebrand" <stewart.hildebrand@amd.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Christophe Leroy" <christophe.leroy@csgroup.eu>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Sam Ravnborg" <sam@ravnborg.org>,
"Yongji Xie" <elohimes@gmail.com>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"Philipp Stanner" <pstanner@redhat.com>
Cc: x86@kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v3 0/8] PCI: Align small BARs
Date: Wed, 07 Aug 2024 17:42:03 +0200 [thread overview]
Message-ID: <877b71ea-341b-4013-bbee-8f4df9c961c9@app.fastmail.com> (raw)
In-Reply-To: <20240807151723.613742-1-stewart.hildebrand@amd.com>
On Wed, Aug 7, 2024, at 17:17, Stewart Hildebrand wrote:
> In this context, "small" is defined as max(SZ_4K, PAGE_SIZE).
>
> This series sets the default minimum resource alignment to
> max(SZ_4K, PAGE_SIZE) for memory BARs. In preparation, it makes an
> optimization and addresses some corner cases observed when reallocating
> BARs. I consider the prepapatory patches to be prerequisites to changing
> the default BAR alignment.
It's probably worth noting that Linux does not support any
architectures with software page sizes smaller than 4KB,
and it would likely break a lot of assumptions, so
max(SZ_4K, PAGE_SIZE) is really the same as PAGE_SIZE
in practice.
Arnd
prev parent reply other threads:[~2024-08-07 15:43 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-07 15:17 [PATCH v3 0/8] PCI: Align small BARs Stewart Hildebrand
2024-08-07 15:17 ` [PATCH v3 1/8] x86/PCI: Improve code readability Stewart Hildebrand
2024-08-08 8:55 ` Ilpo Järvinen
2024-08-07 15:17 ` [PATCH v3 2/8] PCI: Don't unnecessarily disable memory decoding Stewart Hildebrand
2024-08-07 15:17 ` [PATCH v3 3/8] PCI: Restore resource alignment Stewart Hildebrand
2024-08-08 19:28 ` Bjorn Helgaas
2024-08-08 20:28 ` Stewart Hildebrand
2024-08-08 21:54 ` Bjorn Helgaas
2024-08-14 18:12 ` Stewart Hildebrand
2024-08-07 15:17 ` [PATCH v3 4/8] PCI: Restore memory decoding after reallocation Stewart Hildebrand
2024-08-08 19:37 ` Bjorn Helgaas
2024-08-14 18:31 ` Stewart Hildebrand
2024-08-07 15:17 ` [PATCH v3 5/8] x86/PCI: Preserve IORESOURCE_STARTALIGN alignment Stewart Hildebrand
2024-08-08 20:10 ` Bjorn Helgaas
2024-08-07 15:17 ` [PATCH v3 6/8] powerpc/pci: " Stewart Hildebrand
2024-08-07 15:17 ` [PATCH v3 7/8] PCI: Don't reassign resources that are already aligned Stewart Hildebrand
2024-08-07 15:17 ` [PATCH v3 8/8] PCI: Align small BARs Stewart Hildebrand
2024-08-08 21:53 ` Bjorn Helgaas
2024-08-14 13:55 ` Stewart Hildebrand
2024-08-14 22:05 ` Bjorn Helgaas
2024-08-07 15:42 ` Arnd Bergmann [this message]
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