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| author |   Lu Baolu <baolu.lu@linux.intel.com> | 2022-07-12 08:09:04 +0800 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2022-07-15 10:21:40 +0200 |
| commit | 913432f217c843a69ff9d11a6474a7982033087b (patch) | |
| tree | 2bc226dca5619c7d8f7282a211a7904e17a0e62f | |
| parent | iommu/vt-d: Remove unused domain_get_iommu() (diff) | |
| download | wireguard-linux-913432f217c843a69ff9d11a6474a7982033087b.tar.xz wireguard-linux-913432f217c843a69ff9d11a6474a7982033087b.zip | |
iommu/vt-d: Use IDA interface to manage iommu sequence id
Switch dmar unit sequence id allocation and release from bitmap to IDA
interface.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Link: https://lore.kernel.org/r/20220702015610.2849494-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/intel/dmar.c | 35 |
1 files changed, 8 insertions, 27 deletions
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index 2a5e0f91e647..6327b34f5aa7 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -60,7 +60,7 @@ LIST_HEAD(dmar_drhd_units); struct acpi_table_header * __initdata dmar_tbl; static int dmar_dev_scope_status = 1; -static unsigned long dmar_seq_ids[BITS_TO_LONGS(DMAR_UNITS_SUPPORTED)]; +static DEFINE_IDA(dmar_seq_ids); static int alloc_iommu(struct dmar_drhd_unit *drhd); static void free_iommu(struct intel_iommu *iommu); @@ -1023,28 +1023,6 @@ out: return err; } -static int dmar_alloc_seq_id(struct intel_iommu *iommu) -{ - iommu->seq_id = find_first_zero_bit(dmar_seq_ids, - DMAR_UNITS_SUPPORTED); - if (iommu->seq_id >= DMAR_UNITS_SUPPORTED) { - iommu->seq_id = -1; - } else { - set_bit(iommu->seq_id, dmar_seq_ids); - sprintf(iommu->name, "dmar%d", iommu->seq_id); - } - - return iommu->seq_id; -} - -static void dmar_free_seq_id(struct intel_iommu *iommu) -{ - if (iommu->seq_id >= 0) { - clear_bit(iommu->seq_id, dmar_seq_ids); - iommu->seq_id = -1; - } -} - static int alloc_iommu(struct dmar_drhd_unit *drhd) { struct intel_iommu *iommu; @@ -1062,11 +1040,14 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) if (!iommu) return -ENOMEM; - if (dmar_alloc_seq_id(iommu) < 0) { + iommu->seq_id = ida_alloc_range(&dmar_seq_ids, 0, + DMAR_UNITS_SUPPORTED - 1, GFP_KERNEL); + if (iommu->seq_id < 0) { pr_err("Failed to allocate seq_id\n"); - err = -ENOSPC; + err = iommu->seq_id; goto error; } + sprintf(iommu->name, "dmar%d", iommu->seq_id); err = map_iommu(iommu, drhd->reg_base_addr); if (err) { @@ -1150,7 +1131,7 @@ err_sysfs: err_unmap: unmap_iommu(iommu); error_free_seq_id: - dmar_free_seq_id(iommu); + ida_free(&dmar_seq_ids, iommu->seq_id); error: kfree(iommu); return err; @@ -1183,7 +1164,7 @@ static void free_iommu(struct intel_iommu *iommu) if (iommu->reg) unmap_iommu(iommu); - dmar_free_seq_id(iommu); + ida_free(&dmar_seq_ids, iommu->seq_id); kfree(iommu); } |