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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v5 3/3] drivers: Make ioapic_sbdf and hpet_sbdf contain pci_sbdf_t
On Thu, Jul 17, 2025 at 08:31:27AM +0100, Andrii Sultanov wrote:
> Following a similar change to amd_iommu struct, make two more structs
> take pci_sbdf_t directly instead of seg and bdf separately. This lets us
> drop several conversions from the latter to the former and simplifies
> several comparisons and assignments.
>
> Bloat-o-meter reports:
> add/remove: 0/0 grow/shrink: 1/10 up/down: 256/-320 (-64)
> Function old new delta
> _einittext 22092 22348 +256
> parse_ivrs_hpet 248 245 -3
> amd_iommu_detect_one_acpi 876 868 -8
> iov_supports_xt 275 264 -11
> amd_iommu_read_ioapic_from_ire 344 332 -12
> amd_setup_hpet_msi 237 224 -13
> amd_iommu_ioapic_update_ire 575 555 -20
> reserve_unity_map_for_device 453 424 -29
> _hvm_dpci_msi_eoi 160 128 -32
> amd_iommu_get_supported_ivhd_type 86 30 -56
> parse_ivrs_table 3966 3830 -136
>
> Signed-off-by: Andrii Sultanov <sultanovandriy@xxxxxxxxx>
>
> ---
> Changes in V5:
> * Dropped PCI_BDF usage inside PCI_SBDF macros
> * Joined separate seg and bdf comparisons into a single sbdf one in
> parse_ivrs_table
> * Dropped unnecessary bdf in parse_ivhd_device_special, using sbdf.bdf
> instead
> * Reverted print formatting change in amd_iommu_ioapic_update_ire
>
> Changes in V4:
> * Folded several separate seg+bdf comparisons and assignments into one
> with sbdf_t
> * With reshuffling in the prior commits, this commit is no longer
> neutral in terms of code size
>
> Changes in V3:
> * Dropped aliasing of seg and bdf, renamed users.
>
> Changes in V2:
> * Split single commit into several patches
> * Change the format specifier to %pp in amd_iommu_ioapic_update_ire
> ---
> xen/drivers/passthrough/amd/iommu.h | 5 +--
> xen/drivers/passthrough/amd/iommu_acpi.c | 40 ++++++++++------------
> xen/drivers/passthrough/amd/iommu_intr.c | 43 ++++++++++++------------
> 3 files changed, 41 insertions(+), 47 deletions(-)
>
> diff --git a/xen/drivers/passthrough/amd/iommu.h
> b/xen/drivers/passthrough/amd/iommu.h
> index 2599800e6a..52f748310b 100644
> --- a/xen/drivers/passthrough/amd/iommu.h
> +++ b/xen/drivers/passthrough/amd/iommu.h
> @@ -262,7 +262,7 @@ int cf_check amd_setup_hpet_msi(struct msi_desc
> *msi_desc);
> void cf_check amd_iommu_dump_intremap_tables(unsigned char key);
>
> extern struct ioapic_sbdf {
> - u16 bdf, seg;
> + pci_sbdf_t sbdf;
> u8 id;
> bool cmdline;
> u16 *pin_2_idx;
> @@ -273,7 +273,8 @@ unsigned int ioapic_id_to_index(unsigned int apic_id);
> unsigned int get_next_ioapic_sbdf_index(void);
>
> extern struct hpet_sbdf {
> - u16 bdf, seg, id;
> + pci_sbdf_t sbdf;
> + uint16_t id;
> enum {
> HPET_NONE,
> HPET_CMDL,
> diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c
> b/xen/drivers/passthrough/amd/iommu_acpi.c
> index a9c5432e86..c007a427f2 100644
> --- a/xen/drivers/passthrough/amd/iommu_acpi.c
> +++ b/xen/drivers/passthrough/amd/iommu_acpi.c
> @@ -707,8 +707,7 @@ static int __init cf_check parse_ivrs_ioapic(const char
> *str)
> }
> }
>
> - ioapic_sbdf[idx].bdf = PCI_BDF(bus, dev, func);
> - ioapic_sbdf[idx].seg = seg;
> + ioapic_sbdf[idx].sbdf = PCI_SBDF(seg, bus, dev, func);
> ioapic_sbdf[idx].id = id;
> ioapic_sbdf[idx].cmdline = true;
>
> @@ -734,8 +733,7 @@ static int __init cf_check parse_ivrs_hpet(const char
> *str)
> return -EINVAL;
>
> hpet_sbdf.id = id;
> - hpet_sbdf.bdf = PCI_BDF(bus, dev, func);
> - hpet_sbdf.seg = seg;
> + hpet_sbdf.sbdf = PCI_SBDF(seg, bus, dev, func);
> hpet_sbdf.init = HPET_CMDL;
>
> return 0;
> @@ -746,8 +744,9 @@ static u16 __init parse_ivhd_device_special(
> const struct acpi_ivrs_device8c *special, u16 seg,
> u16 header_length, u16 block_length, struct amd_iommu *iommu)
> {
> - u16 dev_length, bdf;
> + u16 dev_length;
> unsigned int apic, idx;
> + pci_sbdf_t sbdf;
>
> dev_length = sizeof(*special);
> if ( header_length < (block_length + dev_length) )
> @@ -756,16 +755,16 @@ static u16 __init parse_ivhd_device_special(
> return 0;
> }
>
> - bdf = special->used_id;
> - if ( bdf >= ivrs_bdf_entries )
> + sbdf = PCI_SBDF(seg, special->used_id);
> + if ( sbdf.bdf >= ivrs_bdf_entries )
> {
> - AMD_IOMMU_ERROR("IVHD: invalid Device_Entry Dev_Id %#x\n", bdf);
> + AMD_IOMMU_ERROR("IVHD: invalid Device_Entry Dev_Id %#x\n", sbdf.bdf);
^^
Suggest using %pp as a formatter (similar to modification below).
> return 0;
> }
>
> AMD_IOMMU_DEBUG("IVHD Special: %pp variety %#x handle %#x\n",
> - &PCI_SBDF(seg, bdf), special->variety, special->handle);
> - add_ivrs_mapping_entry(bdf, bdf, special->header.data_setting, 0, true,
> + &sbdf, special->variety, special->handle);
> + add_ivrs_mapping_entry(sbdf.bdf, sbdf.bdf, special->header.data_setting,
> 0, true,
> iommu);
>
> switch ( special->variety )
> @@ -780,8 +779,7 @@ static u16 __init parse_ivhd_device_special(
> */
> for ( idx = 0; idx < nr_ioapic_sbdf; idx++ )
> {
> - if ( ioapic_sbdf[idx].bdf == bdf &&
> - ioapic_sbdf[idx].seg == seg &&
> + if ( ioapic_sbdf[idx].sbdf.sbdf == sbdf.sbdf &&
> ioapic_sbdf[idx].cmdline )
> break;
> }
> @@ -790,7 +788,7 @@ static u16 __init parse_ivhd_device_special(
> AMD_IOMMU_DEBUG("IVHD: Command line override present for IO-APIC
> %#x"
> "(IVRS: %#x devID %pp)\n",
> ioapic_sbdf[idx].id, special->handle,
> - &PCI_SBDF(seg, bdf));
> + &sbdf);
> break;
> }
>
> @@ -805,8 +803,7 @@ static u16 __init parse_ivhd_device_special(
> special->handle);
> else if ( idx != MAX_IO_APICS && ioapic_sbdf[idx].pin_2_idx )
> {
> - if ( ioapic_sbdf[idx].bdf == bdf &&
> - ioapic_sbdf[idx].seg == seg )
> + if ( ioapic_sbdf[idx].sbdf.sbdf == sbdf.sbdf )
> AMD_IOMMU_WARN("IVHD: duplicate IO-APIC %#x entries\n",
> special->handle);
> else
> @@ -827,8 +824,7 @@ static u16 __init parse_ivhd_device_special(
> }
>
> /* set device id of ioapic */
> - ioapic_sbdf[idx].bdf = bdf;
> - ioapic_sbdf[idx].seg = seg;
> + ioapic_sbdf[idx].sbdf = sbdf;
> ioapic_sbdf[idx].id = special->handle;
>
> ioapic_sbdf[idx].pin_2_idx = xmalloc_array(
> @@ -862,13 +858,12 @@ static u16 __init parse_ivhd_device_special(
> AMD_IOMMU_DEBUG("IVHD: Command line override present for HPET
> %#x "
> "(IVRS: %#x devID %pp)\n",
> hpet_sbdf.id, special->handle,
> - &PCI_SBDF(seg, bdf));
> + &sbdf);
> break;
> case HPET_NONE:
> /* set device id of hpet */
> hpet_sbdf.id = special->handle;
> - hpet_sbdf.bdf = bdf;
> - hpet_sbdf.seg = seg;
> + hpet_sbdf.sbdf = sbdf;
> hpet_sbdf.init = HPET_IVHD;
> break;
> default:
> @@ -1139,9 +1134,8 @@ static int __init cf_check parse_ivrs_table(struct
> acpi_table_header *table)
> return -ENXIO;
> }
>
> - if ( !ioapic_sbdf[idx].seg &&
> - /* SB IO-APIC is always on this device in AMD systems. */
> - ioapic_sbdf[idx].bdf == PCI_BDF(0, 0x14, 0) )
> + /* SB IO-APIC is always on this device in AMD systems. */
> + if ( ioapic_sbdf[idx].sbdf.sbdf == PCI_SBDF(0, 0, 0x14, 0).sbdf )
> sb_ioapic = 1;
>
> if ( ioapic_sbdf[idx].pin_2_idx )
> diff --git a/xen/drivers/passthrough/amd/iommu_intr.c
> b/xen/drivers/passthrough/amd/iommu_intr.c
> index 25bf25904e..7dae89bcc0 100644
> --- a/xen/drivers/passthrough/amd/iommu_intr.c
> +++ b/xen/drivers/passthrough/amd/iommu_intr.c
> @@ -323,7 +323,8 @@ void cf_check amd_iommu_ioapic_update_ire(
> unsigned int apic, unsigned int pin, uint64_t rte)
> {
> struct IO_APIC_route_entry new_rte;
> - int seg, bdf, rc;
> + pci_sbdf_t sbdf;
> + int rc;
> struct amd_iommu *iommu;
> unsigned int idx;
>
> @@ -335,20 +336,19 @@ void cf_check amd_iommu_ioapic_update_ire(
> new_rte.raw = rte;
>
> /* get device id of ioapic devices */
> - bdf = ioapic_sbdf[idx].bdf;
> - seg = ioapic_sbdf[idx].seg;
> - iommu = find_iommu_for_device(PCI_SBDF(seg, bdf));
> + sbdf = ioapic_sbdf[idx].sbdf;
> + iommu = find_iommu_for_device(sbdf);
> if ( !iommu )
> {
> AMD_IOMMU_WARN("failed to find IOMMU for IO-APIC @ %04x:%04x\n",
^^
Use %pp ?
> - seg, bdf);
> + sbdf.seg, sbdf.bdf);
> __ioapic_write_entry(apic, pin, true, new_rte);
> return;
> }
>
> /* Update interrupt remapping entry */
> rc = update_intremap_entry_from_ioapic(
> - bdf, iommu, &new_rte,
> + sbdf.bdf, iommu, &new_rte,
> &ioapic_sbdf[idx].pin_2_idx[pin]);
>
> if ( rc )
> @@ -369,7 +369,8 @@ unsigned int cf_check amd_iommu_read_ioapic_from_ire(
> unsigned int offset;
> unsigned int val = __io_apic_read(apic, reg);
> unsigned int pin = (reg - 0x10) / 2;
> - uint16_t seg, bdf, req_id;
> + pci_sbdf_t sbdf;
> + uint16_t req_id;
> const struct amd_iommu *iommu;
> union irte_ptr entry;
>
> @@ -381,12 +382,11 @@ unsigned int cf_check amd_iommu_read_ioapic_from_ire(
> if ( offset >= INTREMAP_MAX_ENTRIES )
> return val;
>
> - seg = ioapic_sbdf[idx].seg;
> - bdf = ioapic_sbdf[idx].bdf;
> - iommu = find_iommu_for_device(PCI_SBDF(seg, bdf));
> + sbdf = ioapic_sbdf[idx].sbdf;
> + iommu = find_iommu_for_device(sbdf);
> if ( !iommu )
> return val;
> - req_id = get_intremap_requestor_id(seg, bdf);
> + req_id = get_intremap_requestor_id(sbdf.seg, sbdf.bdf);
> entry = get_intremap_entry(iommu, req_id, offset);
>
> if ( !(reg & 1) )
> @@ -515,15 +515,15 @@ int cf_check amd_iommu_msi_msg_update_ire(
> struct msi_desc *msi_desc, struct msi_msg *msg)
> {
> struct pci_dev *pdev = msi_desc->dev;
> - int bdf, seg, rc;
> + pci_sbdf_t sbdf;
> + int rc;
> struct amd_iommu *iommu;
> unsigned int i, nr = 1;
> u32 data;
>
> - bdf = pdev ? pdev->sbdf.bdf : hpet_sbdf.bdf;
> - seg = pdev ? pdev->seg : hpet_sbdf.seg;
> + sbdf = pdev ? pdev->sbdf : hpet_sbdf.sbdf;
I think it is worth moving initialization a bit up:
pci_sbdf_t sbdf = pdev ? pdev->sbdf : hpet_sbdf.sbdf;
>
> - iommu = _find_iommu_for_device(PCI_SBDF(seg, bdf));
> + iommu = _find_iommu_for_device(sbdf);
> if ( IS_ERR_OR_NULL(iommu) )
> return PTR_ERR(iommu);
>
> @@ -532,7 +532,7 @@ int cf_check amd_iommu_msi_msg_update_ire(
>
> if ( msi_desc->remap_index >= 0 && !msg )
> {
> - update_intremap_entry_from_msi_msg(iommu, bdf, nr,
> + update_intremap_entry_from_msi_msg(iommu, sbdf.bdf, nr,
> &msi_desc->remap_index,
> NULL, NULL);
>
> @@ -543,7 +543,7 @@ int cf_check amd_iommu_msi_msg_update_ire(
> if ( !msg )
> return 0;
>
> - rc = update_intremap_entry_from_msi_msg(iommu, bdf, nr,
> + rc = update_intremap_entry_from_msi_msg(iommu, sbdf.bdf, nr,
> &msi_desc->remap_index,
> msg, &data);
> if ( rc >= 0 )
> @@ -660,8 +660,7 @@ bool __init cf_check iov_supports_xt(void)
> if ( idx == MAX_IO_APICS )
> return false;
>
> - if ( !find_iommu_for_device(PCI_SBDF(ioapic_sbdf[idx].seg,
> - ioapic_sbdf[idx].bdf)) )
> + if ( !find_iommu_for_device(ioapic_sbdf[idx].sbdf) )
> {
> AMD_IOMMU_WARN("no IOMMU for IO-APIC %#x (ID %x)\n",
> apic, IO_APIC_ID(apic));
> @@ -690,14 +689,14 @@ int __init cf_check amd_setup_hpet_msi(struct msi_desc
> *msi_desc)
> return -ENODEV;
> }
>
> - iommu = find_iommu_for_device(PCI_SBDF(hpet_sbdf.seg, hpet_sbdf.bdf));
> + iommu = find_iommu_for_device(hpet_sbdf.sbdf);
> if ( !iommu )
> return -ENXIO;
>
> - lock = get_intremap_lock(hpet_sbdf.seg, hpet_sbdf.bdf);
> + lock = get_intremap_lock(hpet_sbdf.sbdf.seg, hpet_sbdf.sbdf.bdf);
> spin_lock_irqsave(lock, flags);
>
> - msi_desc->remap_index = alloc_intremap_entry(iommu, hpet_sbdf.bdf, 1);
> + msi_desc->remap_index = alloc_intremap_entry(iommu, hpet_sbdf.sbdf.bdf,
> 1);
> if ( msi_desc->remap_index >= INTREMAP_MAX_ENTRIES )
> {
> msi_desc->remap_index = -1;
> --
> 2.49.0
>
>
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