kernel/arch/arm/include/asm/io.h, branch linux-4.15.y

ARM: Implement pci_remap_cfgspace() interface

2017-04-24T18:53:13Z

The PCI bus specification (rev 3.0, 3.2.5 "Transaction Ordering and Posting") defines rules for PCI configuration space transactions ordering and posting, that state that configuration writes have to be non-posted transactions. Current ioremap interface on ARM provides mapping functions that provide "bufferable" writes transactions (ie ioremap uses MT_DEVICE memory type) aka posted writes, so PCI host controller drivers have no arch interface to remap PCI configuration space with memory attributes that comply with the PCI specifications for configuration space. Implement an ARM specific pci_remap_cfgspace() interface that allows to map PCI config memory regions with MT_UNCACHED memory type (ie strongly ordered - non-posted writes), providing a remap function that complies with PCI specifications for config space transactions. Signed-off-by: Lorenzo Pieralisi Signed-off-by: Bjorn Helgaas Cc: Arnd Bergmann Cc: Russell King

arm, arm64: don't include blk_types.h in

2016-11-01T15:43:26Z

No need for it - we only use struct bio_vec in prototypes and already have forward declarations for it. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2016-07-28T21:22:25Z

Pull trivial tree updates from Jiri Kosina. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: fat: fix error message for bogus number of directory entries fat: fix typo s/supeblock/superblock/ ASoC: max9877: Remove unused function declaration dw2102: don't output spurious blank lines to the kernel log init: fix Kconfig text ARM: io: fix comment grammar ocfs: fix ocfs2_xattr_user_get() argument name scsi/qla2xxx: Remove erroneous unused macro qla82xx_get_temp_val1()

ARM: io: fix comment grammar

2016-06-21T11:24:01Z

Signed-off-by: Andrew F. Davis Signed-off-by: Jiri Kosina

ARM: memremap: implement arch_memremap_wb()

2016-04-04T08:26:42Z

The generic memremap() falls back to using ioremap_cache() to create MEMREMAP_WB mappings if the requested region is not already covered by the linear mapping, unless the architecture provides an implementation of arch_memremap_wb(). Since ioremap_cache() is not appropriate on ARM to map memory with the same attributes used for the linear mapping, implement arch_memremap_wb() which does exactly that. Also, relax the WARN() check to allow MT_MEMORY_RW mappings of pfn_valid() pages. Cc: Russell King Acked-by: Dan Williams Signed-off-by: Ard Biesheuvel

ARM: reintroduce ioremap_cached() for creating cached I/O mappings

2016-04-04T08:26:40Z

The original ARM-only ioremap flavor 'ioremap_cached' has been renamed to 'ioremap_cache' to align with other architectures, and subsequently abused in generic code to map things like firmware tables in memory. For that reason, there is currently an effort underway to deprecate ioremap_cache, whose semantics are poorly defined, and which is typed with an __iomem annotation that is inappropriate for mappings of ordinary memory. However, original users of ioremap_cached() used it in a context where the I/O connotation is appropriate, and replacing those instances with memremap() does not make sense. So let's revive ioremap_cached(), so that we can change back those original users before we drop ioremap_cache entirely in favor of memremap. Cc: Russell King Acked-by: Dan Williams Signed-off-by: Ard Biesheuvel

ARM: avoid unwanted GCC memset()/memcpy() optimisations for IO variants

2015-07-03T19:46:15Z

We don't want GCC optimising our memset_io(), memcpy_fromio() or memcpy_toio() variants, so we must not call one of the standard functions. Provide a separate name for our assembly memcpy() and memset() functions, and use that instead, thereby bypassing GCC's ability to optimise these operations. GCCs optimisation may introduce unaligned accesses which are invalid for device mappings. Signed-off-by: Russell King

ARM: io: convert ioremap*() to functions

2015-07-03T16:06:56Z

Convert the ioremap*() preprocessor macros to real functions, moving them out of line. This allows us to kill off __arm_ioremap(), and __arm_iounmap() helpers, and remove __arm_ioremap_pfn_caller() from global view. Signed-off-by: Russell King

ARM: io: fix ioremap_wt() implementation

2015-07-03T14:00:23Z

ioremap_wt() was added by aliasing it to ioremap_nocache(), which is a device mapping. Device mappings do not allow unaligned accesses, but it appears that GCC is able to inline its own memcpy() implementation which may use such accesses. The only user of this is pmem, which uses memcpy() on the region. Therefore, this is unsafe. We must implement ioremap_wt() correctly for ARM, or not at all. This patch adds a more correct implementation by re-using ioremap_wc() to provide a normal-memory non-cacheable mapping. Signed-off-by: Russell King

ARM: io: document ARM specific behaviour of ioremap*() implementations

2015-07-03T14:00:23Z

Add documentation of the ARM specific behaviour of the mappings setup by the ioremap() series of macros. Signed-off-by: Russell King