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authorLukas Wunner <lukas@wunner.de>2026-06-04 17:12:08 +0200
committerBjorn Helgaas <bhelgaas@google.com>2026-06-09 17:04:02 -0500
commit0ba76b19fd4c7256787eab0283c759b18eb76876 (patch)
tree25b29e0b420a2c7b8a382d0c28ded5942dad3c08 /scripts/Makefile.thinlto
parent951ebc18d181af1d90deddbc0ef3269061d6e03c (diff)
PCI/P2PDMA: Add Intel QAT, DSA, IAA devices to whitelist
The first device on a PCI root bus determines whether the host bridge is whitelisted for P2PDMA. All Intel Xeon chips since Ice Lake (ICX, 2021) expose a device with ID 0x09a2 as first device. It is loosely associated with the IOMMU. All these Xeon chips support P2PDMA, so since the addition of the device with commit feaea1fe8b36 ("PCI/P2PDMA: Add Intel 3rd Gen Intel Xeon Scalable Processors to whitelist"), P2PDMA has been allowed on all new Xeons without the need to amend the whitelist: Xeons with Performance Cores: Sapphire Rapids (SPR, 2023) Emerald Rapids (EMR, 2023) Granite Rapids (GNR, 2024) Diamond Rapids (DMR, 2026) Xeons with Efficiency Cores: Sierra Forest (SRF, 2024) Clearwater Forest (CWF, 2026) However these Xeons also expose accelerators as first device on a root bus of its own: QuickAssist Technology (QAT, crypto & compression accelerator) Data Streaming Accelerator (DSA, dma engine) In-Memory Analytics Accelerator (IAA, compression accelerator) Whitelist them for P2PDMA as well. Move their Device ID macros from the accelerator drivers to <linux/pci_ids.h> for reuse by P2PDMA code. Unfortunately the Device IDs vary across Xeon generations as additional features were added to the accelerators. This currently necessitates an amendment for each new Xeon chip. For future chips, this need shall be avoided by an ongoing effort to extend ACPI HMAT with PCIe P2PDMA characteristics (latency, bandwidth, ordering constraints). The PCI core will be able look up in this BIOS-provided ACPI table whether P2PDMA is supported, instead of relying on a whitelist that needs to be amended continuously. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Acked-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> # QAT Cc: stable@vger.kernel.org Link: https://patch.msgid.link/6aac4922b5fe7070b11874427a9285e42ddd05a4.1780585518.git.lukas@wunner.de
Diffstat (limited to 'scripts/Makefile.thinlto')
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