From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: "Vidya Sagar" <vidyas@nvidia.com>,
"Rafael J . Wysocki" <rafael@kernel.org>,
"Len Brown" <lenb@kernel.org>, "Will Deacon" <will@kernel.org>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Rob Herring" <robh@kernel.org>,
"Frank Rowand" <frowand.list@gmail.com>,
"Thierry Reding" <treding@nvidia.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Krishna Thota" <kthota@nvidia.com>,
"Manikanta Maddireddy" <mmaddireddy@nvidia.com>,
"Vidya Sagar" <sagar.tv@gmail.com>,
linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
"Bjorn Helgaas" <bhelgaas@google.com>
Subject: Re: [PATCH v7-incomplete 1/3] PCI: Move PRESERVE_BOOT_CONFIG _DSM evaluation to pci_register_host_bridge()
Date: Mon, 22 Apr 2024 10:45:46 +0300 [thread overview]
Message-ID: <ZiYVqulm8cE_FGKx@surfacebook.localdomain> (raw)
In-Reply-To: <20240421190914.374399-2-helgaas@kernel.org>
Sun, Apr 21, 2024 at 02:09:12PM -0500, Bjorn Helgaas kirjoitti:
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> Move the PRESERVE_BOOT_CONFIG _DSM evaluation from acpi_pci_root_create()
> to pci_register_host_bridge().
>
> This will help unify the ACPI _DSM path and the DT-based
> "linux,pci-probe-only" paths.
...
> +bool pci_acpi_preserve_config(struct pci_host_bridge *host_bridge)
> +{
> + if (ACPI_HANDLE(&host_bridge->dev)) {
Wouldn't the below looks nicer if you invert the conditional?
handle = ACPI_HANDLE(...);
if (!handle)
return false;
...
> + union acpi_object *obj;
> +
> + /*
> + * Evaluate the "PCI Boot Configuration" _DSM Function. If it
> + * exists and returns 0, we must preserve any PCI resource
> + * assignments made by firmware for this host bridge.
> + */
> + obj = acpi_evaluate_dsm_typed(ACPI_HANDLE(&host_bridge->dev),
> + &pci_acpi_dsm_guid,
> + 1, DSM_PCI_PRESERVE_BOOT_CONFIG,
> + NULL, ACPI_TYPE_INTEGER);
> + if (obj && obj->integer.value == 0)
> + return true;
> + ACPI_FREE(obj);
> + }
> +
> + return false;
> +}
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2024-04-22 7:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240110030725.710547-3-vidyas@nvidia.com>
2024-02-22 12:41 ` [PATCH V3] PCI: Add support for preserving boot configuration Vidya Sagar
2024-02-22 17:06 ` Bjorn Helgaas
2024-02-22 21:18 ` Vidya Sagar
2024-02-22 22:08 ` Bjorn Helgaas
2024-02-23 8:00 ` [PATCH V4] " Vidya Sagar
2024-03-05 14:10 ` Rob Herring
2024-03-05 14:24 ` Rob Herring
2024-04-01 7:50 ` [PATCH V5] " Vidya Sagar
2024-04-02 16:01 ` Rob Herring
2024-04-10 7:44 ` Vidya Sagar
2024-04-10 20:50 ` Bjorn Helgaas
2024-04-18 17:31 ` Vidya Sagar
2024-04-18 17:40 ` [PATCH V6] " Vidya Sagar
2024-04-21 19:03 ` Bjorn Helgaas
2024-04-21 19:09 ` [PATCH v7-incomplete 0/3] " Bjorn Helgaas
2024-04-21 19:09 ` [PATCH v7-incomplete 1/3] PCI: Move PRESERVE_BOOT_CONFIG _DSM evaluation to pci_register_host_bridge() Bjorn Helgaas
2024-04-22 7:45 ` Andy Shevchenko [this message]
2024-04-21 19:09 ` [PATCH v7-incomplete 2/3] PCI: of: Add of_pci_preserve_config() for per-host bridge support Bjorn Helgaas
2024-04-21 19:09 ` [PATCH v7-incomplete 3/3] PCI: Unify ACPI and DT 'preserve config' support Bjorn Helgaas
2024-04-22 7:43 ` Andy Shevchenko
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