[PATCH 0/7] cleanup issues with io{read|write}64

Logan Gunthorpe
2017-06-22T16:49:25Z

Hi,

Presently, the 64bit IO functions are not very usable in drivers because
they are not universally available in all architectures. This leads to
a bunch of hacks in the kernel to work around this. (See the last 3
patches in this series.) As part of my switchtec_ntb submission which
added another one of these warts, Greg asked me to look into fixing
it[1].

So this patchset attempts to solve this issue by filling in the missing
implementations in iomap.c and io.h. After that, the alpha architecture is
the only one I found that also needed a fix for this. Finally, this
patchset removes the hacks that have accumulated in the kernel,
thus far, for working around this.

This set is based off of v4.12-rc6.

Thanks,

Logan

[1] https://marc.info/?l=linux-kernel&m=149774601910663&w=2

Logan Gunthorpe (7):
drm/tilcdc: don't use volatile with iowrite64
iomap: implement ioread64 and iowrite64
asm-generic/io.h: make ioread64 and iowrite64 universally available
alpha: provide ioread64 and iowrite64 implementations
ntb: ntb_hw_intel: remove ioread64 and iowrite64 hacks
drm/tilcdc: clean up ifdef hacks around iowrite64
crypto: caam: cleanup CONFIG_64BIT ifdefs when using io{read|write}64

arch/alpha/include/asm/io.h | 2 ++
arch/alpha/kernel/io.c | 18 +++++++++++
arch/powerpc/include/asm/io.h | 2 ++
drivers/crypto/caam/regs.h | 29 -----------------
drivers/gpu/drm/tilcdc/tilcdc_regs.h | 8 +----
drivers/ntb/hw/intel/ntb_hw_intel.c | 30 -----------------
include/asm-generic/io.h | 54 ++++++++++++++++++++++++-------
include/asm-generic/iomap.h | 4 ---
lib/iomap.c | 62 ++++++++++++++++++++++++++++++++++++
9 files changed, 127 insertions(+), 82 deletions(-)

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2.11.0