From 6123133ee90fc55a5437364d442dd5876648628d Mon Sep 17 00:00:00 2001 From: Robert Richter Date: Fri, 14 Nov 2025 08:58:41 +0100 Subject: [PATCH] cxl: Simplify cxl_rd_ops allocation and handling A root decoder's callback handlers are collected in struct cxl_rd_ops. The structure is dynamically allocated, though it contains only a few pointers in it. This also requires to check two pointes to check for the existence of a callback. Simplify the allocation, release and handler check by embedding the ops statically in struct cxl_root_decoder. Implementation is equivalent to how struct cxl_root_ops handles the callbacks. [ dj: Fix spelling error in commit log. ] Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Signed-off-by: Robert Richter Link: https://patch.msgid.link/20251114075844.1315805-2-rrichter@amd.com Signed-off-by: Dave Jiang --- drivers/cxl/acpi.c | 8 ++------ drivers/cxl/core/port.c | 1 - drivers/cxl/core/region.c | 20 +++++--------------- drivers/cxl/cxl.h | 2 +- 4 files changed, 8 insertions(+), 23 deletions(-) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index bd2e282ca93a0..cef3e07244fd7 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -475,12 +475,8 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws, cxlrd->qos_class = cfmws->qtg_id; if (cfmws->interleave_arithmetic == ACPI_CEDT_CFMWS_ARITHMETIC_XOR) { - cxlrd->ops = kzalloc(sizeof(*cxlrd->ops), GFP_KERNEL); - if (!cxlrd->ops) - return -ENOMEM; - - cxlrd->ops->hpa_to_spa = cxl_apply_xor_maps; - cxlrd->ops->spa_to_hpa = cxl_apply_xor_maps; + cxlrd->ops.hpa_to_spa = cxl_apply_xor_maps; + cxlrd->ops.spa_to_hpa = cxl_apply_xor_maps; } rc = cxl_decoder_add(cxld); diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 8128fd2b5b317..fef3aa0c6680c 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -459,7 +459,6 @@ static void cxl_root_decoder_release(struct device *dev) if (atomic_read(&cxlrd->region_id) >= 0) memregion_free(atomic_read(&cxlrd->region_id)); __cxl_decoder_release(&cxlrd->cxlsd.cxld); - kfree(cxlrd->ops); kfree(cxlrd); } diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index b06fee1978ba4..095af0f4760fb 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2924,16 +2924,6 @@ static bool cxl_is_hpa_in_chunk(u64 hpa, struct cxl_region *cxlr, int pos) return false; } -static bool has_hpa_to_spa(struct cxl_root_decoder *cxlrd) -{ - return cxlrd->ops && cxlrd->ops->hpa_to_spa; -} - -static bool has_spa_to_hpa(struct cxl_root_decoder *cxlrd) -{ - return cxlrd->ops && cxlrd->ops->spa_to_hpa; -} - u64 cxl_dpa_to_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd, u64 dpa) { @@ -2988,8 +2978,8 @@ u64 cxl_dpa_to_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd, hpa = hpa_offset + p->res->start + p->cache_size; /* Root decoder translation overrides typical modulo decode */ - if (has_hpa_to_spa(cxlrd)) - hpa = cxlrd->ops->hpa_to_spa(cxlrd, hpa); + if (cxlrd->ops.hpa_to_spa) + hpa = cxlrd->ops.hpa_to_spa(cxlrd, hpa); if (!cxl_resource_contains_addr(p->res, hpa)) { dev_dbg(&cxlr->dev, @@ -2998,7 +2988,7 @@ u64 cxl_dpa_to_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd, } /* Simple chunk check, by pos & gran, only applies to modulo decodes */ - if (!has_hpa_to_spa(cxlrd) && (!cxl_is_hpa_in_chunk(hpa, cxlr, pos))) + if (!cxlrd->ops.hpa_to_spa && !cxl_is_hpa_in_chunk(hpa, cxlr, pos)) return ULLONG_MAX; return hpa; @@ -3033,8 +3023,8 @@ static int region_offset_to_dpa_result(struct cxl_region *cxlr, u64 offset, * If the root decoder has SPA to CXL HPA callback, use it. Otherwise * CXL HPA is assumed to equal SPA. */ - if (has_spa_to_hpa(cxlrd)) { - hpa = cxlrd->ops->spa_to_hpa(cxlrd, p->res->start + offset); + if (cxlrd->ops.spa_to_hpa) { + hpa = cxlrd->ops.spa_to_hpa(cxlrd, p->res->start + offset); hpa_offset = hpa - p->res->start; } else { hpa_offset = offset; diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 231ddccf89773..6524b242e8c4b 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -451,7 +451,7 @@ struct cxl_root_decoder { void *platform_data; struct mutex range_lock; int qos_class; - struct cxl_rd_ops *ops; + struct cxl_rd_ops ops; struct cxl_switch_decoder cxlsd; }; -- 2.47.3