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| Started by | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| First post | 2015-08-25 20:50 +0200 |
| Last post | 2015-08-25 20:50 +0200 |
| Articles | 1 — 1 participant |
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Re: [PATCH V2 0/4] PCI: ACPI: Setting up DMA coherency for PCI device from _CCA attribute Arnd Bergmann <arnd@arndb.de> - 2015-08-25 20:50 +0200
| From | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| Date | 2015-08-25 20:50 +0200 |
| Subject | Re: [PATCH V2 0/4] PCI: ACPI: Setting up DMA coherency for PCI device from _CCA attribute |
| Message-ID | <q1rsd-6uO-5@gated-at.bofh.it> |
On Wednesday 26 August 2015 00:33:25 Suravee Suthikulpanit wrote: > This patch adds support to setup DMA coherency for PCI device using > the ACPI _CCA attribute. According to the ACPI spec, the _CCA attribute > is required for ARM64. Therefore, this patch is a pre-req for ACPI PCI > support for ARM64 which is currently in development. > > Also, this should not affect other architectures that does not define > CONFIG_ACPI_CCA_REQUIRED, since the default value is coherent. > We only support ACPI on SBSA compliant platforms, and SBSA mandates cache-coherent PCI, so I don't think this is actually needed, just use coherent all the time and do WARN_ON(!CCA) to catch people that try to incorrectly use ACPI on a non-SBSA platform. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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