From: Dave Jiang Date: Fri, 14 Mar 2025 22:26:23 +0000 (-0700) Subject: Merge branch 'for-6.15/guard_cleanups' into cxl-for-next2 X-Git-Tag: v6.15-rc1~45^2~9 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=b6faa9c613787b894913638a76030018f6d62d54;p=linux.git Merge branch 'for-6.15/guard_cleanups' into cxl-for-next2 A series of CXL refactoring using scope based resource management to remove goto patterns on the cleanup paths. --- b6faa9c613787b894913638a76030018f6d62d54 diff --cc drivers/cxl/core/hdm.c index d705dec1471e,1edbf7873471..70cae4ebf8a4 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@@ -576,18 -398,15 +566,15 @@@ int cxl_dpa_free(struct cxl_endpoint_de if (cxled->cxld.id != port->hdm_end) { dev_dbg(dev, "expected decoder%d.%d\n", port->id, port->hdm_end); - rc = -EBUSY; - goto out; + return -EBUSY; } + devm_cxl_dpa_release(cxled); - rc = 0; - out: - up_write(&cxl_dpa_rwsem); - return rc; + return 0; } -int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled, - enum cxl_decoder_mode mode) +int cxl_dpa_set_part(struct cxl_endpoint_decoder *cxled, + enum cxl_partition_mode mode) { struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); struct cxl_dev_state *cxlds = cxlmd->cxlds; @@@ -616,18 -442,16 +603,17 @@@ return 0; } - int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, unsigned long long size) + static int __cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, unsigned long long size) { struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); - struct cxl_port *port = cxled_to_port(cxled); - resource_size_t free_ram_start, free_pmem_start; struct cxl_dev_state *cxlds = cxlmd->cxlds; struct device *dev = &cxled->cxld.dev; - resource_size_t start, avail, skip; + struct resource *res, *prev = NULL; + resource_size_t start, avail, skip, skip_start; struct resource *p, *last; - int part, rc; ++ int part; - down_write(&cxl_dpa_rwsem); + guard(rwsem_write)(&cxl_dpa_rwsem); if (cxled->cxld.region) { dev_dbg(dev, "decoder attached to %s\n", dev_name(&cxled->cxld.region->dev)); @@@ -637,62 -460,64 +622,64 @@@ if (cxled->cxld.flags & CXL_DECODER_F_ENABLE) { dev_dbg(dev, "decoder enabled\n"); - rc = -EBUSY; - goto out; + return -EBUSY; } - for (p = cxlds->ram_res.child, last = NULL; p; p = p->sibling) - last = p; - if (last) - free_ram_start = last->end + 1; - else - free_ram_start = cxlds->ram_res.start; + part = cxled->part; + if (part < 0) { + dev_dbg(dev, "partition not set\n"); - rc = -EBUSY; - goto out; ++ return -EBUSY; + } - for (p = cxlds->pmem_res.child, last = NULL; p; p = p->sibling) + res = &cxlds->part[part].res; + for (p = res->child, last = NULL; p; p = p->sibling) last = p; if (last) - free_pmem_start = last->end + 1; + start = last->end + 1; else - free_pmem_start = cxlds->pmem_res.start; + start = res->start; - if (cxled->mode == CXL_DECODER_RAM) { - start = free_ram_start; - avail = cxlds->ram_res.end - start + 1; - skip = 0; - } else if (cxled->mode == CXL_DECODER_PMEM) { - resource_size_t skip_start, skip_end; - - start = free_pmem_start; - avail = cxlds->pmem_res.end - start + 1; - skip_start = free_ram_start; - - /* - * If some pmem is already allocated, then that allocation - * already handled the skip. - */ - if (cxlds->pmem_res.child && - skip_start == cxlds->pmem_res.child->start) - skip_end = skip_start - 1; - else - skip_end = start - 1; - skip = skip_end - skip_start + 1; - } else { - dev_dbg(dev, "mode not set\n"); - return -EINVAL; + /* + * To allocate at partition N, a skip needs to be calculated for all + * unallocated space at lower partitions indices. + * + * If a partition has any allocations, the search can end because a + * previous cxl_dpa_alloc() invocation is assumed to have accounted for + * all previous partitions. + */ + skip_start = CXL_RESOURCE_NONE; + for (int i = part; i; i--) { + prev = &cxlds->part[i - 1].res; + for (p = prev->child, last = NULL; p; p = p->sibling) + last = p; + if (last) { + skip_start = last->end + 1; + break; + } + skip_start = prev->start; } + avail = res->end - start + 1; + if (skip_start == CXL_RESOURCE_NONE) + skip = 0; + else + skip = res->start - skip_start; + if (size > avail) { dev_dbg(dev, "%pa exceeds available %s capacity: %pa\n", &size, - cxl_decoder_mode_name(cxled->mode), &avail); + res->name, &avail); - rc = -ENOSPC; - goto out; + return -ENOSPC; } - rc = __cxl_dpa_reserve(cxled, start, size, skip); - out: - up_write(&cxl_dpa_rwsem); + return __cxl_dpa_reserve(cxled, start, size, skip); + } + + int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, unsigned long long size) + { + struct cxl_port *port = cxled_to_port(cxled); + int rc; + rc = __cxl_dpa_alloc(cxled, size); if (rc) return rc; diff --cc drivers/cxl/core/mbox.c index 998e1df36db6,0601297af0c9..7299cd3a0155 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@@ -1229,30 -1232,38 +1228,27 @@@ int cxl_mem_sanitize(struct cxl_memdev * be sure that the device is unmapped. */ if (endpoint && cxl_num_decoders_committed(endpoint) == 0) - rc = __cxl_mem_sanitize(mds, cmd); - else - rc = -EBUSY; - up_read(&cxl_region_rwsem); + return __cxl_mem_sanitize(mds, cmd); - return rc; + return -EBUSY; } -static int add_dpa_res(struct device *dev, struct resource *parent, - struct resource *res, resource_size_t start, - resource_size_t size, const char *type) +static void add_part(struct cxl_dpa_info *info, u64 start, u64 size, enum cxl_partition_mode mode) { - int rc; + int i = info->nr_partitions; - res->name = type; - res->start = start; - res->end = start + size - 1; - res->flags = IORESOURCE_MEM; - if (resource_size(res) == 0) { - dev_dbg(dev, "DPA(%s): no capacity\n", res->name); - return 0; - } - rc = request_resource(parent, res); - if (rc) { - dev_err(dev, "DPA(%s): failed to track %pr (%d)\n", res->name, - res, rc); - return rc; - } - - dev_dbg(dev, "DPA(%s): %pr\n", res->name, res); + if (size == 0) + return; - return 0; + info->part[i].range = (struct range) { + .start = start, + .end = start + size - 1, + }; + info->part[i].mode = mode; + info->nr_partitions++; } -int cxl_mem_create_range_info(struct cxl_memdev_state *mds) +int cxl_mem_dpa_fetch(struct cxl_memdev_state *mds, struct cxl_dpa_info *info) { struct cxl_dev_state *cxlds = &mds->cxlds; struct device *dev = cxlds->dev; diff --cc drivers/cxl/core/region.c index 84ce625b8591,a750107a3bff..824d356d9d23 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@@ -3301,14 -3272,39 +3271,40 @@@ static int __construct_region(struct cx /* ...to match put_device() in cxl_add_to_region() */ get_device(&cxlr->dev); - up_write(&cxl_region_rwsem); - return cxlr; + return 0; + } - err: - up_write(&cxl_region_rwsem); - devm_release_action(port->uport_dev, unregister_region, cxlr); - return ERR_PTR(rc); + /* Establish an empty region covering the given HPA range */ + static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder *cxled) + { + struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); + struct cxl_port *port = cxlrd_to_port(cxlrd); ++ struct cxl_dev_state *cxlds = cxlmd->cxlds; ++ int rc, part = READ_ONCE(cxled->part); + struct cxl_region *cxlr; - int rc; + + do { - cxlr = __create_region(cxlrd, cxled->mode, ++ cxlr = __create_region(cxlrd, cxlds->part[part].mode, + atomic_read(&cxlrd->region_id)); + } while (IS_ERR(cxlr) && PTR_ERR(cxlr) == -EBUSY); + + if (IS_ERR(cxlr)) { + dev_err(cxlmd->dev.parent, + "%s:%s: %s failed assign region: %ld\n", + dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), + __func__, PTR_ERR(cxlr)); + return cxlr; + } + + rc = __construct_region(cxlr, cxlrd, cxled); + if (rc) { + devm_release_action(port->uport_dev, unregister_region, cxlr); + return ERR_PTR(rc); + } + + return cxlr; } int cxl_add_to_region(struct cxl_port *root, struct cxl_endpoint_decoder *cxled)