Dave Airlie 8ef4227615 x86/io: add interface to reserve io memtype for a resource range. (v1.1) ... A recent change to the mm code in: 87744ab383 mm: fix cache mode tracking in vm_insert_mixed() started enforcing checking the memory type against the registered list for amixed pfn insertion mappings. It happens that the drm drivers for a number of gpus relied on this being broken. Currently the driver only inserted VRAM mappings into the tracking table when they came from the kernel, and userspace mappings never landed in the table. This led to a regression where all the mapping end up as UC instead of WC now. I've considered a number of solutions but since this needs to be fixed in fixes and not next, and some of the solutions were going to introduce overhead that hadn't been there before I didn't consider them viable at this stage. These mainly concerned hooking into the TTM io reserve APIs, but these API have a bunch of fast paths I didn't want to unwind to add this to. The solution I've decided on is to add a new API like the arch_phys_wc APIs (these would have worked but wc_del didn't take a range), and use them from the drivers to add a WC compatible mapping to the table for all VRAM on those GPUs. This means we can then create userspace mapping that won't get degraded to UC. v1.1: use CONFIG_X86_PAT + add some comments in io.h Cc: Toshi Kani <toshi.kani@hp.com> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: x86@kernel.org Cc: mcgrof@suse.com Cc: Dan Williams <dan.j.williams@intel.com> Acked-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Dave Airlie <airlied@redhat.com>		2016-10-26 15:45:38 +10:00
..
acpi	Merge branches 'acpi-wdat' and 'acpi-cppc'	2016-10-21 22:24:23 +02:00
asm-generic	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2016-10-14 14:26:58 -07:00
clocksource
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2016-10-10 11:19:47 +08:00
drm	drm/crtc: constify drm_crtc_index parameter	2016-10-10 17:28:58 +02:00
dt-bindings	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2016-10-12 11:05:23 -07:00
keys
kvm
linux	x86/io: add interface to reserve io memtype for a resource range. (v1.1)	2016-10-26 15:45:38 +10:00
math-emu
media	Linux 4.8	2016-10-05 16:43:53 -03:00
memory
misc
net	A single commit converting the mac80211 DocBook template over to Sphinx.	2016-10-14 14:11:22 -07:00
pcmcia
ras
rdma	Merge of primary rdma-core code for 4.9	2016-10-09 17:04:33 -07:00
rxrpc
scsi
soc	powerpc updates for 4.9 #2	2016-10-14 11:07:42 -07:00
sound
target	target: Make EXTENDED_COPY 0xe4 failure return COPY TARGET DEVICE NOT REACHABLE	2016-10-19 21:22:32 -07:00
trace	Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2016-10-14 12:18:50 -07:00
uapi	A small bug fix and a new driver for acting as an IPMI device.	2016-10-23 15:56:23 -07:00
video	fbdev changes for 4.9	2016-10-12 11:01:37 -07:00
xen	xen: features and fixes for 4.9-rc0	2016-10-06 11:19:10 -07:00
Kbuild