From 75875b04b1aeec995e2121d874e4bf62040a717b Mon Sep 17 00:00:00 2001 From: Pankaj Gupta Date: Fri, 5 Jul 2019 19:33:22 +0530 Subject: [PATCH] BACKPORT: libnvdimm: nd_region flush callback support This patch adds functionality to perform flush from guest to host over VIRTIO. We are registering a callback based on 'nd_region' type. virtio_pmem driver requires this special flush function. For rest of the region types we are registering existing flush function. Report error returned by host fsync failure to userspace. Signed-off-by: Pankaj Gupta Signed-off-by: Dan Williams (cherry picked from commit c5d4355d10d414a96ca870b731756b89d068d57a) [adelva: backport around some nvdimm refactors in >4.14] Bug: 146400078 Bug: 148297388 Change-Id: Icf6ff5327b3c74455a4d53d2d37ac7fef7fbda85 Signed-off-by: Alistair Delva --- drivers/acpi/nfit/core.c | 4 ++-- drivers/nvdimm/claim.c | 6 ++++-- drivers/nvdimm/nd.h | 1 + drivers/nvdimm/pmem.c | 13 ++++++++----- drivers/nvdimm/region_devs.c | 26 ++++++++++++++++++++++++-- include/linux/libnvdimm.h | 9 ++++++++- 6 files changed, 47 insertions(+), 12 deletions(-) diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 05fb821c2558..7e91575496b6 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1980,7 +1980,7 @@ 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); - nvdimm_flush(nfit_blk->nd_region); + nvdimm_flush(nfit_blk->nd_region, NULL); if (nfit_blk->dimm_flags & NFIT_BLK_DCR_LATCH) readq(mmio->addr.base + offset); @@ -2029,7 +2029,7 @@ static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk, } if (rw) - nvdimm_flush(nfit_blk->nd_region); + nvdimm_flush(nfit_blk->nd_region, NULL); rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0; return rc; diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c index b2fc29b8279b..32f2aaf62f27 100644 --- a/drivers/nvdimm/claim.c +++ b/drivers/nvdimm/claim.c @@ -263,7 +263,7 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns, struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512); sector_t sector = offset >> 9; - int rc = 0; + int rc = 0, ret = 0; if (unlikely(!size)) return 0; @@ -299,7 +299,9 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns, } memcpy_flushcache(nsio->addr + offset, buf, size); - nvdimm_flush(to_nd_region(ndns->dev.parent)); + ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL); + if (ret) + rc = ret; return rc; } diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index e3f060f0b83e..b79a8d0f9b48 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -170,6 +170,7 @@ struct nd_region { struct badblocks bb; struct nd_interleave_set *nd_set; struct nd_percpu_lane __percpu *lane; + int (*flush)(struct nd_region *nd_region, struct bio *bio); struct nd_mapping mapping[0]; }; diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 80f8bbf83742..76934fadca97 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -169,6 +169,7 @@ static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page, static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) { + int ret = 0; blk_status_t rc = 0; bool do_acct; unsigned long start; @@ -178,7 +179,7 @@ static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) struct nd_region *nd_region = to_region(pmem); if (bio->bi_opf & REQ_FLUSH) - nvdimm_flush(nd_region); + ret = nvdimm_flush(nd_region, bio); do_acct = nd_iostat_start(bio, &start); bio_for_each_segment(bvec, bio, iter) { @@ -194,7 +195,10 @@ static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) nd_iostat_end(bio, start); if (bio->bi_opf & REQ_FUA) - nvdimm_flush(nd_region); + ret = nvdimm_flush(nd_region, bio); + + if (ret) + bio->bi_status = errno_to_blk_status(ret); bio_endio(bio); return BLK_QC_T_NONE; @@ -415,7 +419,6 @@ static int pmem_attach_disk(struct device *dev, } dax_write_cache(dax_dev, wbc); pmem->dax_dev = dax_dev; - gendev = disk_to_dev(disk); gendev->groups = pmem_attribute_groups; @@ -473,14 +476,14 @@ static int nd_pmem_remove(struct device *dev) sysfs_put(pmem->bb_state); pmem->bb_state = NULL; } - nvdimm_flush(to_nd_region(dev->parent)); + nvdimm_flush(to_nd_region(dev->parent), NULL); return 0; } static void nd_pmem_shutdown(struct device *dev) { - nvdimm_flush(to_nd_region(dev->parent)); + nvdimm_flush(to_nd_region(dev->parent), NULL); } static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index bd68b7b01d08..c0e6a6d235de 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -282,7 +282,9 @@ static ssize_t deep_flush_store(struct device *dev, struct device_attribute *att return rc; if (!flush) return -EINVAL; - nvdimm_flush(nd_region); + rc = nvdimm_flush(nd_region, NULL); + if (rc) + return rc; return len; } @@ -1002,6 +1004,11 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, dev->of_node = ndr_desc->of_node; nd_region->ndr_size = resource_size(ndr_desc->res); nd_region->ndr_start = ndr_desc->res->start; + if (ndr_desc->flush) + nd_region->flush = ndr_desc->flush; + else + nd_region->flush = NULL; + nd_device_register(dev); return nd_region; @@ -1042,11 +1049,24 @@ struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus, } EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create); +int nvdimm_flush(struct nd_region *nd_region, struct bio *bio) +{ + int rc = 0; + + if (!nd_region->flush) + rc = generic_nvdimm_flush(nd_region); + else { + if (nd_region->flush(nd_region, bio)) + rc = -EIO; + } + + return rc; +} /** * nvdimm_flush - flush any posted write queues between the cpu and pmem media * @nd_region: blk or interleaved pmem region */ -void nvdimm_flush(struct nd_region *nd_region) +int generic_nvdimm_flush(struct nd_region *nd_region) { struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev); int i, idx; @@ -1070,6 +1090,8 @@ void nvdimm_flush(struct nd_region *nd_region) if (ndrd_get_flush_wpq(ndrd, i, 0)) writeq(1, ndrd_get_flush_wpq(ndrd, i, idx)); wmb(); + + return 0; } EXPORT_SYMBOL_GPL(nvdimm_flush); diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index 51edfc6394f0..84284e3353ed 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -18,6 +18,7 @@ #include #include #include +#include enum { /* when a dimm supports both PMEM and BLK access a label is required */ @@ -36,6 +37,9 @@ enum { /* region flag indicating to direct-map persistent memory by default */ ND_REGION_PAGEMAP = 0, + /* Platform provides asynchronous flush mechanism */ + ND_REGION_ASYNC = 3, + /* mark newly adjusted resources as requiring a label update */ DPA_RESOURCE_ADJUSTED = 1 << 0, }; @@ -92,6 +96,7 @@ struct nd_mapping_desc { int position; }; +struct nd_region; struct nd_region_desc { struct resource *res; struct nd_mapping_desc *mapping; @@ -103,6 +108,7 @@ struct nd_region_desc { int numa_node; unsigned long flags; struct device_node *of_node; + int (*flush)(struct nd_region *nd_region, struct bio *bio); }; struct device; @@ -174,7 +180,8 @@ unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr); unsigned int nd_region_acquire_lane(struct nd_region *nd_region); void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane); u64 nd_fletcher64(void *addr, size_t len, bool le); -void nvdimm_flush(struct nd_region *nd_region); +int nvdimm_flush(struct nd_region *nd_region, struct bio *bio); +int generic_nvdimm_flush(struct nd_region *nd_region); int nvdimm_has_flush(struct nd_region *nd_region); int nvdimm_has_cache(struct nd_region *nd_region);