From f284a4f23752d0334e482d04e0a584d19c9c8cd0 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 7 Jul 2016 19:44:50 -0700 Subject: libnvdimm: introduce nvdimm_flush() and nvdimm_has_flush() nvdimm_flush() is a replacement for the x86 'pcommit' instruction. It is an optional write flushing mechanism that an nvdimm bus can provide for the pmem driver to consume. In the case of the NFIT nvdimm-bus-provider nvdimm_flush() is implemented as a series of flush-hint-address [1] writes to each dimm in the interleave set (region) that backs the namespace. The nvdimm_has_flush() routine relies on platform firmware to describe the flushing capabilities of a platform. It uses the heuristic of whether an nvdimm bus provider provides flush address data to return a ternary result: 1: flush addresses defined 0: dimm topology described without flush addresses (assume ADR) -errno: no topology information, unable to determine flush mechanism The pmem driver is expected to take the following actions on this ternary result: 1: nvdimm_flush() in response to REQ_FUA / REQ_FLUSH and shutdown 0: do not set, WC or FUA on the queue, take no further action -errno: warn and then operate as if nvdimm_has_flush() returned '0' The caveat of this heuristic is that it can not distinguish the "dimm does not have flush address" case from the "platform firmware is broken and failed to describe a flush address". Given we are already explicitly trusting the NFIT there's not much more we can do beyond blacklisting broken firmwares if they are ever encountered. Cc: Ross Zwisler Signed-off-by: Dan Williams --- drivers/acpi/nfit.c | 33 +++------------------------------ drivers/acpi/nfit.h | 1 - 2 files changed, 3 insertions(+), 31 deletions(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index 6796f780870a..0497175ee6cb 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -1393,24 +1393,6 @@ static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio) return mmio->base_offset + line_offset + table_offset + sub_line_offset; } -static void wmb_blk(struct nfit_blk *nfit_blk) -{ - - if (nfit_blk->nvdimm_flush) { - /* - * The first wmb() is needed to 'sfence' all previous writes - * such that they are architecturally visible for the platform - * buffer flush. Note that we've already arranged for pmem - * writes to avoid the cache via arch_memcpy_to_pmem(). The - * final wmb() ensures ordering for the NVDIMM flush write. - */ - wmb(); - writeq(1, nfit_blk->nvdimm_flush); - wmb(); - } else - wmb_pmem(); -} - static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw) { struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR]; @@ -1445,7 +1427,7 @@ static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw, offset = to_interleave_offset(offset, mmio); writeq(cmd, mmio->addr.base + offset); - wmb_blk(nfit_blk); + nvdimm_flush(nfit_blk->nd_region); if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH) readq(mmio->addr.base + offset); @@ -1496,7 +1478,7 @@ static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk, } if (rw) - wmb_blk(nfit_blk); + nvdimm_flush(nfit_blk->nd_region); rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0; return rc; @@ -1570,7 +1552,6 @@ static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus, { struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus); struct nd_blk_region *ndbr = to_nd_blk_region(dev); - struct nfit_flush *nfit_flush; struct nfit_blk_mmio *mmio; struct nfit_blk *nfit_blk; struct nfit_mem *nfit_mem; @@ -1645,15 +1626,7 @@ static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus, return rc; } - nfit_flush = nfit_mem->nfit_flush; - if (nfit_flush && nfit_flush->flush->hint_count != 0) { - nfit_blk->nvdimm_flush = devm_nvdimm_ioremap(dev, - nfit_flush->flush->hint_address[0], 8); - if (!nfit_blk->nvdimm_flush) - return -ENOMEM; - } - - if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush) + if (nvdimm_has_flush(nfit_blk->nd_region) < 0) dev_warn(dev, "unable to guarantee persistence of writes\n"); if (mmio->line_size == 0) diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h index 9282eb324dcc..9fda77cf81da 100644 --- a/drivers/acpi/nfit.h +++ b/drivers/acpi/nfit.h @@ -183,7 +183,6 @@ struct nfit_blk { u64 bdw_offset; /* post interleave offset */ u64 stat_offset; u64 cmd_offset; - void __iomem *nvdimm_flush; u32 dimm_flags; }; -- cgit v1.2.3