| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20210409112035.27221-1-david@redhat.com>
Date: Fri, 9 Apr 2021 13:20:35 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>, Joel Stanley <joel@....id.au>,
Andrew Jeffery <andrew@...id.au>,
Lucas Stach <l.stach@...gutronix.de>,
Russell King <linux+etnaviv@...linux.org.uk>,
Christian Gmeiner <christian.gmeiner@...il.com>,
Paul Cercueil <paul@...pouillou.net>,
Linus Walleij <linus.walleij@...aro.org>,
Christoph Hellwig <hch@....de>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Robin Murphy <robin.murphy@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Rapoport <rppt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Eric Anholt <eric@...olt.net>,
Michal Simek <michal.simek@...inx.com>,
Masahiro Yamada <masahiroy@...nel.org>,
"Alexander A. Klimov" <grandmaster@...klimov.de>,
Peter Collingbourne <pcc@...gle.com>,
Suman Anna <s-anna@...com>, Jason Gunthorpe <jgg@...pe.ca>,
dri-devel@...ts.freedesktop.org, linux-aspeed@...ts.ozlabs.org,
linux-arm-kernel@...ts.infradead.org,
etnaviv@...ts.freedesktop.org, linux-mips@...r.kernel.org,
linux-fbdev@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: [PATCH v3] drivers: introduce and use WANT_DMA_CMA for soft dependencies on DMA_CMA
Random drivers should not override a user configuration of core knobs
(e.g., CONFIG_DMA_CMA=n). Applicable drivers would like to use DMA_CMA,
which depends on CMA, if possible; however, these drivers also have to
tolerate if DMA_CMA is not available/functioning, for example, if no CMA
area for DMA_CMA use has been setup via "cma=X". In the worst case, the
driver cannot do it's job properly in some configurations.
For example, commit 63f5677544b3 ("drm/etnaviv: select CMA and DMA_CMA if
available") documents
While this is no build dependency, etnaviv will only work correctly
on most systems if CMA and DMA_CMA are enabled. Select both options
if available to avoid users ending up with a non-working GPU due to
a lacking kernel config.
So etnaviv really wants to have DMA_CMA, however, can deal with some cases
where it is not available.
Let's introduce WANT_DMA_CMA and use it in most cases where drivers
select CMA/DMA_CMA, or depend on DMA_CMA (in a wrong way via CMA because
of recursive dependency issues).
We'll assume that any driver that selects DRM_GEM_CMA_HELPER or
DRM_KMS_CMA_HELPER would like to use DMA_CMA if possible.
With this change, distributions can disable CONFIG_CMA or
CONFIG_DMA_CMA, without it silently getting enabled again by random
drivers. Also, we'll now automatically try to enabled both, CONFIG_CMA
and CONFIG_DMA_CMA if they are unspecified and any driver is around that
selects WANT_DMA_CMA -- also implicitly via DRM_GEM_CMA_HELPER or
DRM_KMS_CMA_HELPER.
For example, if any driver selects WANT_DMA_CMA and we do a
"make olddefconfig":
1. With "# CONFIG_CMA is not set" and no specification of
"CONFIG_DMA_CMA"
-> CONFIG_DMA_CMA won't be part of .config
2. With no specification of CONFIG_CMA or CONFIG_DMA_CMA
Contiguous Memory Allocator (CMA) [Y/n/?] (NEW)
DMA Contiguous Memory Allocator (DMA_CMA) [Y/n/?] (NEW)
3. With "# CONFIG_CMA is not set" and "# CONFIG_DMA_CMA is not set"
-> CONFIG_DMA_CMA will be removed from .config
Note: drivers/remoteproc seems to be special; commit c51e882cd711
("remoteproc/davinci: Update Kconfig to depend on DMA_CMA") explains that
there is a real dependency to DMA_CMA for it to work; leave that dependency
in place and don't convert it to a soft dependency.
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Maxime Ripard <mripard@...nel.org>
Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Joel Stanley <joel@....id.au>
Cc: Andrew Jeffery <andrew@...id.au>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Russell King <linux+etnaviv@...linux.org.uk>
Cc: Christian Gmeiner <christian.gmeiner@...il.com>
Cc: Paul Cercueil <paul@...pouillou.net>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: Eric Anholt <eric@...olt.net>
Cc: Michal Simek <michal.simek@...inx.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: "Alexander A. Klimov" <grandmaster@...klimov.de>
Cc: Peter Collingbourne <pcc@...gle.com>
Cc: Suman Anna <s-anna@...com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-aspeed@...ts.ozlabs.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: etnaviv@...ts.freedesktop.org
Cc: linux-mips@...r.kernel.org
Cc: linux-fbdev@...r.kernel.org
Cc: iommu@...ts.linux-foundation.org
Signed-off-by: David Hildenbrand <david@...hat.com>
---
Let's see if this approach is better for soft dependencies (and if we
actually have some hard dependencies in there). This is the follow-up
of
https://lkml.kernel.org/r/20210408092011.52763-1-david@redhat.com
https://lkml.kernel.org/r/20210408100523.63356-1-david@redhat.com
I was wondering if it would make sense in some drivers to warn if either
CONFIG_DMA_CMA is not available or if DRM_CMA has not been configured
properly - just to give people a heads up that something might more likely
go wrong; that would, however, be future work.
v2 -> v3:
- Don't use "imply" but instead use a new WANT_DMA_CMA and make the default
of CMA and DMA_CMA depend on it.
- Also adjust ingenic, mcde, tve200; these sound like soft dependencies as
well (although DMA_CMA is really desired)
v1 -> v2:
- Fix DRM_CMA -> DMA_CMA
---
drivers/gpu/drm/Kconfig | 2 ++
drivers/gpu/drm/aspeed/Kconfig | 2 --
drivers/gpu/drm/etnaviv/Kconfig | 3 +--
drivers/gpu/drm/ingenic/Kconfig | 1 -
drivers/gpu/drm/mcde/Kconfig | 1 -
drivers/gpu/drm/tve200/Kconfig | 1 -
drivers/video/fbdev/Kconfig | 2 +-
kernel/dma/Kconfig | 7 +++++++
mm/Kconfig | 1 +
9 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 85b79a7fee63..6f9989adfa93 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -201,12 +201,14 @@ config DRM_TTM_HELPER
config DRM_GEM_CMA_HELPER
bool
depends on DRM
+ select WANT_DMA_CMA
help
Choose this if you need the GEM CMA helper functions
config DRM_KMS_CMA_HELPER
bool
depends on DRM
+ select WANT_DMA_CMA
select DRM_GEM_CMA_HELPER
help
Choose this if you need the KMS CMA helper functions
diff --git a/drivers/gpu/drm/aspeed/Kconfig b/drivers/gpu/drm/aspeed/Kconfig
index 5e95bcea43e9..e5ff33f85f21 100644
--- a/drivers/gpu/drm/aspeed/Kconfig
+++ b/drivers/gpu/drm/aspeed/Kconfig
@@ -6,8 +6,6 @@ config DRM_ASPEED_GFX
depends on MMU
select DRM_KMS_HELPER
select DRM_KMS_CMA_HELPER
- select DMA_CMA if HAVE_DMA_CONTIGUOUS
- select CMA if HAVE_DMA_CONTIGUOUS
select MFD_SYSCON
help
Chose this option if you have an ASPEED AST2500 SOC Display
diff --git a/drivers/gpu/drm/etnaviv/Kconfig b/drivers/gpu/drm/etnaviv/Kconfig
index faa7fc68b009..a3e7649b44a7 100644
--- a/drivers/gpu/drm/etnaviv/Kconfig
+++ b/drivers/gpu/drm/etnaviv/Kconfig
@@ -9,8 +9,7 @@ config DRM_ETNAVIV
select THERMAL if DRM_ETNAVIV_THERMAL
select TMPFS
select WANT_DEV_COREDUMP
- select CMA if HAVE_DMA_CONTIGUOUS
- select DMA_CMA if HAVE_DMA_CONTIGUOUS
+ select WANT_DMA_CMA
select DRM_SCHED
help
DRM driver for Vivante GPUs.
diff --git a/drivers/gpu/drm/ingenic/Kconfig b/drivers/gpu/drm/ingenic/Kconfig
index 3b57f8be007c..156b11b7bbb8 100644
--- a/drivers/gpu/drm/ingenic/Kconfig
+++ b/drivers/gpu/drm/ingenic/Kconfig
@@ -2,7 +2,6 @@ config DRM_INGENIC
tristate "DRM Support for Ingenic SoCs"
depends on MIPS || COMPILE_TEST
depends on DRM
- depends on CMA
depends on OF
depends on COMMON_CLK
select DRM_BRIDGE
diff --git a/drivers/gpu/drm/mcde/Kconfig b/drivers/gpu/drm/mcde/Kconfig
index 71c689b573c9..217d54c4babc 100644
--- a/drivers/gpu/drm/mcde/Kconfig
+++ b/drivers/gpu/drm/mcde/Kconfig
@@ -1,7 +1,6 @@
config DRM_MCDE
tristate "DRM Support for ST-Ericsson MCDE (Multichannel Display Engine)"
depends on DRM
- depends on CMA
depends on ARM || COMPILE_TEST
depends on OF
depends on COMMON_CLK
diff --git a/drivers/gpu/drm/tve200/Kconfig b/drivers/gpu/drm/tve200/Kconfig
index e2d163c74ed6..d04b7322c770 100644
--- a/drivers/gpu/drm/tve200/Kconfig
+++ b/drivers/gpu/drm/tve200/Kconfig
@@ -2,7 +2,6 @@
config DRM_TVE200
tristate "DRM Support for Faraday TV Encoder TVE200"
depends on DRM
- depends on CMA
depends on ARM || COMPILE_TEST
depends on OF
select DRM_BRIDGE
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 4f02db65dede..e8acd4f77d41 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -2186,7 +2186,7 @@ config FB_HYPERV
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
select FB_DEFERRED_IO
- select DMA_CMA if HAVE_DMA_CONTIGUOUS && CMA
+ select WANT_DMA_CMA
help
This framebuffer driver supports Microsoft Hyper-V Synthetic Video.
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 77b405508743..928f16d2461d 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -103,8 +103,15 @@ config DMA_DIRECT_REMAP
select DMA_REMAP
select DMA_COHERENT_POOL
+config WANT_DMA_CMA
+ bool
+ help
+ Drivers should "select" this option if they desire to use the
+ DMA_CMA mechanism.
+
config DMA_CMA
bool "DMA Contiguous Memory Allocator"
+ default y if WANT_DMA_CMA
depends on HAVE_DMA_CONTIGUOUS && CMA
help
This enables the Contiguous Memory Allocator which allows drivers
diff --git a/mm/Kconfig b/mm/Kconfig
index 24c045b24b95..169598ee56b1 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -485,6 +485,7 @@ config FRONTSWAP
config CMA
bool "Contiguous Memory Allocator"
+ default y if WANT_DMA_CMA
depends on MMU
select MIGRATION
select MEMORY_ISOLATION
--
2.30.2
Powered by blists - more mailing lists