[DragonFlyBSD - Bug #3455] (Resolved) drm: pci_set_dma_mask() always fails ("Can't set DMA mask/consistent mask (-5)")

[liweitianux]

Issue #3455 has been updated by liweitianux.

Status changed from New to Resolved

Patch merged. Thank you.

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Bug #3455: drm: pci_set_dma_mask() always fails ("Can't set DMA mask/consistent mask (-5)")
http://bugs.dragonflybsd.org/issues/3455#change-14902

* Author: sigttou
* Status: Resolved
* Priority: Normal
* Category: Driver
* Target version: 6.6
* Start date: 2026-10-22
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The drm compat functions @pci_set_dma_mask()@ and @pci_set_consistent_dma_mask()@ return @-EIO@ unconditionally. Every boot with i915
on gen8+ logs @[drm:gen8_gmch_probe] ERROR Can't set DMA mask/consistent mask (-5)@.

Accept a requested mask when it covers the installed memory (@ptoa(Maxmem)@) and, for the consistent mask, when it is at least 32 bits.
Otherwise return @-EIO@ as before, so drivers still get an error on machines whose memory exceeds what the device can address.


---Files--------------------------------
0001-drm-implement-pci_set_dma_mask-and-pci_set_consisten.patch (1.8 KB)


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