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cxl/core/regs: Refactor out functions to count regblocks of given type

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cxl_find_regblock_instance() counts the number of instances of a register
block as a side effect of searching through all available register blocks.
cxl_count_regblock() throws away that work and recounts all the register
blocks by asking cxl_find_regblock_instance() to redo work it has
already done until it finally returns an error, that is needlessly
wasteful.

Let cxl_count_regblock() leverage the counting that
cxl_find_regblock_instance() already does by passing in a sentinel value
(CXL_INSTANCES_COUNT) that triggers the count to be returned.

[ davej: Updated to more concise commit log supplied by djbw ]
[ davej: Fix up checkpatch formatting warnings ]

Signed-off-by: Huaisheng Ye <huaisheng.ye@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20250115152600.26482-2-huaisheng.ye@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Huaisheng Ye
2025-01-15 23:26:00 +08:00
committed by Dave Jiang
parent 6cdbd84dc4
commit 448a60e85a
3 changed files with 41 additions and 24 deletions
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6
drivers/cxl/pci.c
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@@ -907,7 +907,8 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
struct cxl_dev_state *cxlds;
struct cxl_register_map map;
struct cxl_memdev *cxlmd;
int i, rc, pmu_count;
int rc, pmu_count;
unsigned int i;
bool irq_avail;
/*
@@ -1009,6 +1010,9 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return rc;
pmu_count = cxl_count_regblock(pdev, CXL_REGLOC_RBI_PMU);
if (pmu_count < 0)
return pmu_count;
for (i = 0; i < pmu_count; i++) {
struct cxl_pmu_regs pmu_regs;