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Maciej W. Rozycki e7f6b41ad2 TC: Set DMA masks for devices 
commit 3f2aa244ee upstream.

Fix a TURBOchannel support regression with commit 205e1b7f51
("dma-mapping: warn when there is no coherent_dma_mask") that caused
coherent DMA allocations to produce a warning such as:

defxx: v1.11 2014/07/01  Lawrence V. Stefani and others
tc1: DEFTA at MMIO addr = 0x1e900000, IRQ = 20, Hardware addr = 08-00-2b-a3-a3-29
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 dfx_dev_register+0x670/0x678
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #2
Stack : ffffffff8009ffc0 fffffffffffffec0 0000000000000000 ffffffff80647650
        0000000000000000 0000000000000000 ffffffff806f5f80 ffffffffffffffff
        0000000000000000 0000000000000000 0000000000000001 ffffffff8065d4e8
        98000000031b6300 ffffffff80563478 ffffffff805685b0 ffffffffffffffff
        0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8
        0000000000000000 0000000000000009 ffffffff8053efd0 ffffffff806657d0
        0000000000000000 ffffffff803177f8 0000000000000000 ffffffff806d0000
        9800000003078000 980000000307b9e0 000000001e900000 ffffffff80067940
        0000000000000000 ffffffff805d6720 0000000000000204 ffffffff80388df8
        ffffffff805176c0 ffffffff8004dc78 0000000000000000 ffffffff80067940
        ...
Call Trace:
[<ffffffff8004dc78>] show_stack+0xa0/0x130
[<ffffffff80067940>] __warn+0x128/0x170
---[ end trace b1d1e094f67f3bb2 ]---

This is because the TURBOchannel bus driver fails to set the coherent
DMA mask for devices enumerated.

Set the regular and coherent DMA masks for TURBOchannel devices then,
observing that the bus protocol supports a 34-bit (16GiB) DMA address
space, by interpreting the value presented in the address cycle across
the 32 `ad' lines as a 32-bit word rather than byte address[1].  The
architectural size of the TURBOchannel DMA address space exceeds the
maximum amount of RAM any actual TURBOchannel system in existence may
have, hence both masks are the same.

This removes the warning shown above.

References:

[1] "TURBOchannel Hardware Specification", EK-369AA-OD-007B, Digital
    Equipment Corporation, January 1993, Section "DMA", pp. 1-15 -- 1-17

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20835/
Fixes: 205e1b7f51 ("dma-mapping: warn when there is no coherent_dma_mask")
Cc: stable@vger.kernel.org # 4.16+
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-13 11:15:11 -08:00
arch MIPS: OCTEON: fix out of bounds array access on CN68XX 2018-11-13 11:15:10 -08:00
block block, bfq: correctly charge and reset entity service in all cases 2018-11-13 11:14:55 -08:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: tcrypt - fix ghash-generic speed test 2018-11-13 11:15:07 -08:00
Documentation ARM: dts: at91: add new compatibility string for macb on sama5d3 2018-10-18 09:16:22 +02:00
drivers TC: Set DMA masks for devices 2018-11-13 11:15:11 -08:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs lockd: fix access beyond unterminated strings in prints 2018-11-13 11:15:10 -08:00
include TC: Set DMA masks for devices 2018-11-13 11:15:11 -08:00
init init: rename and re-order boot_cpu_state_init() 2018-08-15 18:12:48 +02:00
ipc ipc/sem.c: prevent queue.status tearing in semop 2018-09-05 09:26:30 +02:00
kernel genirq: Fix race on spurious interrupt detection 2018-11-13 11:15:09 -08:00
lib locking/lockdep: Fix debug_locks off performance problem 2018-11-13 11:14:51 -08:00
mm mm/rmap: map_pte() was not handling private ZONE_DEVICE page properly 2018-11-13 11:15:08 -08:00
net nfsd: Fix an Oops in free_session() 2018-11-13 11:15:10 -08:00
samples samples/bpf: Check the error of write() and read() 2018-08-24 13:09:12 +02:00
scripts kconfig: fix the rule of mainmenu_stmt symbol 2018-11-04 14:52:45 +01:00
security ima: fix showing large 'violations' or 'runtime_measurements_count' 2018-11-13 11:15:08 -08:00
sound ASoC: intel: skylake: Add missing break in skl_tplg_get_token() 2018-11-13 11:15:05 -08:00
tools cpupower: Fix AMD Family 0x17 msr_pstate size 2018-11-13 11:15:01 -08:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM: arm64: Fix caching of host MDCR_EL2 value 2018-11-13 11:15:08 -08:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS dt-bindings: Document mti,mips-cpc binding 2018-03-15 10:54:35 +01:00
Makefile Linux 4.14.80 2018-11-10 07:48:36 -08:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.