[v4,0/4] Add PMEM support for RISC-V

Message

Anup Patel Oct. 19, 2022, 1:11 p.m. UTC

The Linux NVDIMM PEM drivers require arch support to map and access the
persistent memory device. This series adds RISC-V PMEM support using
recently added Svpbmt and Zicbom support.

First two patches are fixes and remaining two patches add the required
PMEM support for Linux RISC-V.

These patches can also be found in riscv_pmem_v4 branch at:
https://github.com/avpatel/linux.git

Changes since v3:
 - Pickup correct version of Drew's patch as PATCH1

Changes since v2:
 - Rebased on Linux-6.1-rc1
 - Replaced PATCH1 with the patch proposed by Drew

Changes since v1:
 - Fix error reported by test bot
   https://lore.kernel.org/all/[e-mail]/

Andrew Jones (1):
  RISC-V: Fix compilation without RISCV_ISA_ZICBOM

Anup Patel (3):
  RISC-V: Fix ioremap_cache() and ioremap_wc() for systems with Svpbmt
  RISC-V: Implement arch specific PMEM APIs
  RISC-V: Enable PMEM drivers

 arch/riscv/Kconfig                  |  1 +
 arch/riscv/configs/defconfig        |  1 +
 arch/riscv/include/asm/cacheflush.h |  8 ------
 arch/riscv/include/asm/io.h         | 10 +++++++
 arch/riscv/include/asm/pgtable.h    |  2 ++
 arch/riscv/mm/Makefile              |  1 +
 arch/riscv/mm/cacheflush.c          | 38 ++++++++++++++++++++++++++
 arch/riscv/mm/dma-noncoherent.c     | 41 -----------------------------
 arch/riscv/mm/pmem.c                | 21 +++++++++++++++
 9 files changed, 74 insertions(+), 49 deletions(-)
 create mode 100644 arch/riscv/mm/pmem.c