linux_dsm_epyc7002/arch/sh/mm
Logan Gunthorpe bfeb022f8f mm/memory_hotplug: add pgprot_t to mhp_params
devm_memremap_pages() is currently used by the PCI P2PDMA code to create
struct page mappings for IO memory.  At present, these mappings are
created with PAGE_KERNEL which implies setting the PAT bits to be WB.
However, on x86, an mtrr register will typically override this and force
the cache type to be UC-.  In the case firmware doesn't set this
register it is effectively WB and will typically result in a machine
check exception when it's accessed.

Other arches are not currently likely to function correctly seeing they
don't have any MTRR registers to fall back on.

To solve this, provide a way to specify the pgprot value explicitly to
arch_add_memory().

Of the arches that support MEMORY_HOTPLUG: x86_64, and arm64 need a
simple change to pass the pgprot_t down to their respective functions
which set up the page tables.  For x86_32, set the page tables
explicitly using _set_memory_prot() (seeing they are already mapped).

For ia64, s390 and sh, reject anything but PAGE_KERNEL settings -- this
should be fine, for now, seeing these architectures don't support
ZONE_DEVICE.

A check in __add_pages() is also added to ensure the pgprot parameter
was set for all arches.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Badger <ebadger@gigaio.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Link: http://lkml.kernel.org/r/20200306170846.9333-7-logang@deltatee.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-10 15:36:21 -07:00
..
alignment.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
asids-debugfs.c sh: no need to check return value of debugfs_create functions 2019-06-03 15:39:40 +02:00
cache-debugfs.c sh: no need to check return value of debugfs_create functions 2019-06-03 15:39:40 +02:00
cache-j2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
cache-sh2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
cache-sh2a.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
cache-sh3.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
cache-sh4.c mm: fix races between swapoff and flush dcache 2018-04-05 21:36:26 -07:00
cache-sh5.c sh: move inline before return type 2017-07-12 16:26:04 -07:00
cache-sh7705.c mm: fix races between swapoff and flush dcache 2018-04-05 21:36:26 -07:00
cache-shx3.c sh: prefix sh-specific "CCR" and "CCR2" by "SH_" 2014-03-04 07:55:49 -08:00
cache.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
consistent.c sh: Use pr_warn instead of pr_warning 2019-10-18 13:52:05 +02:00
extable_32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
extable_64.c lib/extable.c: use bsearch() library function in search_extable() 2017-07-10 16:32:35 -07:00
fault.c mm/vma: make vma_is_accessible() available for general use 2020-04-07 10:43:37 -07:00
flush-sh4.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hugetlbpage.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
init.c mm/memory_hotplug: add pgprot_t to mhp_params 2020-04-10 15:36:21 -07:00
ioremap_fixed.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
ioremap.c sh: remove __iounmap 2019-11-11 21:18:19 +01:00
Kconfig mm: remove quicklist page table caches 2019-09-24 15:54:09 -07:00
kmap.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
Makefile sh: use the generic get_user_pages_fast code 2019-07-12 11:05:44 -07:00
mmap.c mm: larger stack guard gap, between vmas 2017-06-19 21:50:20 +08:00
nommu.c mm: consolidate pgtable_cache_init() and pgd_cache_init() 2019-09-24 15:54:09 -07:00
numa.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pgtable.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmb.c sh: no need to check return value of debugfs_create functions 2019-06-03 15:39:40 +02:00
sram.c sh: fix up fallout from system.h disintegration. 2012-03-30 19:29:57 +09:00
tlb-debugfs.c sh: no need to check return value of debugfs_create functions 2019-06-03 15:39:40 +02:00
tlb-pteaex.c Disintegrate asm/system.h for SH 2012-03-28 18:30:03 +01:00
tlb-sh3.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
tlb-sh4.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 2019-05-30 11:29:53 -07:00
tlb-sh5.c sh: delete __cpuinit usage from all sh files 2013-07-14 19:36:53 -04:00
tlb-urb.c sh: update the TLB replacement counter for entry wiring. 2010-03-26 11:37:16 +09:00
tlbex_32.c sh: Enable shared page fault handler for _32/_64. 2012-05-14 15:33:28 +09:00
tlbex_64.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
tlbflush_32.c sh: Provide a global TLB flush for U/I-TLB clear. 2010-07-02 15:44:09 +09:00
tlbflush_64.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
uncached.c treewide: replace #include <asm/sizes.h> with #include <linux/sizes.h> 2019-05-14 19:52:52 -07:00