linux-kernel - RE: [RFC] avoid indirect calls for DMA direct mappings v2

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Date:   Tue, 11 Dec 2018 16:42:55 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Christoph Hellwig <hch@....de>
CC:     "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Marek Szyprowski" <m.szyprowski@...sung.com>,
        "Busch, Keith" <keith.busch@...el.com>,
        "Derrick, Jonathan" <jonathan.derrick@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC] avoid indirect calls for DMA direct mappings v2

> This should fix it:
...
> +#include <linux/dma-noncoherent.h>

Not quite. Still have an issue with __phys_to_pfn(paddr)

Trying ti #include <asm-generic/memory_model.h> gave we a raft of redefined
macros. So I just added

#define      __phys_to_pfn(paddr)    PHYS_PFN(paddr)

to arch/ia64/mm/init.c

That made the build work. But boot spontaneously resets after:

mptsas: ioc1: attaching ssp device: fw_channel 0, fw_id 6, phy 6, sas_addr 0x5000c5000ecada69
scsi 5:0:0:0: Direct-Access     SEAGATE  ST9146802SS      0003 PQ: 0 ANSI: 5
EFI Variables Facility v0.08 2004-May-17
sd 5:0:0:0: [sdb] 286749488 512-byte logical blocks: (147 GB/137 GiB)
sd 5:0:0:0: [sdb] Write Protect is off
sd 5:0:0:0: [sdb] Write cache: enabled, read cache: enabled, supports DPO and FUA
 sdb: sdb1 sdb2
sd 5:0:0:0: [sdb] Attached SCSI disk

But that might not be your fault. My ancient system is getting flaky. A v4.19 build that
has booted before is also resetting :-(

-Tony