[patch 05/53] x86/apic: Get rid of get_physical_broadcast()

Thomas Gleixner
2023-08-07T13:53:21Z

There is no point for this function. The only case where this is used when
there is no XAPIC available, which means the broadcast address is 0xF.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/apic/apic.c | 10 ---------
arch/x86/kernel/apic/io_apic.c | 42 ++++++++++++++++++-----------------------
2 files changed, 19 insertions(+), 33 deletions(-)

--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -259,16 +259,6 @@ u64 native_apic_icr_read(void)
return icr1 | ((u64)icr2 << 32);
}

-#ifdef CONFIG_X86_32
-/**
- * get_physical_broadcast - Get number of physical broadcast IDs
- */
-int get_physical_broadcast(void)
-{
- return modern_apic() ? 0xff : 0xf;
-}
-#endif
-
/**
* lapic_get_maxlvt - get the maximum number of local vector table entries
*/
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1460,12 +1460,12 @@ void restore_boot_irq_mode(void)
*/
static void __init setup_ioapic_ids_from_mpc_nocheck(void)
{
- union IO_APIC_reg_00 reg_00;
physid_mask_t phys_id_present_map;
- int ioapic_idx;
- int i;
+ const u32 broadcast_id = 0xF;
+ union IO_APIC_reg_00 reg_00;
unsigned char old_id;
unsigned long flags;
+ int ioapic_idx, i;

/*
* This is broken; anything with a real cpu count has to
@@ -1484,11 +1484,10 @@ static void __init setup_ioapic_ids_from

old_id = mpc_ioapic_id(ioapic_idx);

- if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
- printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
- ioapic_idx, mpc_ioapic_id(ioapic_idx));
- printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
- reg_00.bits.ID);
+ if (mpc_ioapic_id(ioapic_idx) >= broadcast_id) {
+ pr_err("BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
+ ioapic_idx, mpc_ioapic_id(ioapic_idx));
+ pr_err("... fixing up to %d. (tell your hw vendor)\n", reg_00.bits.ID);
ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
}

@@ -1499,15 +1498,14 @@ static void __init setup_ioapic_ids_from
*/
if (apic->check_apicid_used(&phys_id_present_map,
mpc_ioapic_id(ioapic_idx))) {
- printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
+ pr_err("BIOS bug, IO-APIC#%d ID %d is already used!...\n",
ioapic_idx, mpc_ioapic_id(ioapic_idx));
- for (i = 0; i < get_physical_broadcast(); i++)
+ for (i = 0; i < broadcast_id; i++)
if (!physid_isset(i, phys_id_present_map))
break;
- if (i >= get_physical_broadcast())
+ if (i >= broadcast_id)
panic("Max APIC ID exceeded!\n");
- printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
- i);
+ pr_err("... fixing up to %d. (tell your hw vendor)\n", i);
physid_set(i, phys_id_present_map);
ioapics[ioapic_idx].mp_config.apicid = i;
} else {
@@ -2495,6 +2493,7 @@ unsigned int arch_dynirq_lower_bound(uns
static int io_apic_get_unique_id(int ioapic, int apic_id)
{
static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
+ const u32 broadcast_id = 0xF;
union IO_APIC_reg_00 reg_00;
unsigned long flags;
int i = 0;
@@ -2515,9 +2514,9 @@ static int io_apic_get_unique_id(int ioa
reg_00.raw = io_apic_read(ioapic, 0);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);

- if (apic_id >= get_physical_broadcast()) {
- printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
- "%d\n", ioapic, apic_id, reg_00.bits.ID);
+ if (apic_id >= broadcast_id) {
+ pr_warn("IOAPIC[%d]: Invalid apic_id %d, trying %d\n",
+ ioapic, apic_id, reg_00.bits.ID);
apic_id = reg_00.bits.ID;
}

@@ -2527,17 +2526,15 @@ static int io_apic_get_unique_id(int ioa
*/
if (apic->check_apicid_used(&apic_id_map, apic_id)) {

- for (i = 0; i < get_physical_broadcast(); i++) {
+ for (i = 0; i < broadcast_id; i++) {
if (!apic->check_apicid_used(&apic_id_map, i))
break;
}

- if (i == get_physical_broadcast())
+ if (i == broadcast_id)
panic("Max apic_id exceeded!\n");

- printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
- "trying %d\n", ioapic, apic_id, i);
-
+ pr_warn("IOAPIC[%d]: apic_id %d already used, trying %d\n", ioapic, apic_id, i);
apic_id = i;
}

@@ -2567,8 +2564,7 @@ static int io_apic_get_unique_id(int ioa

static u8 io_apic_unique_id(int idx, u8 id)
{
- if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
- !APIC_XAPIC(boot_cpu_apic_version))
+ if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && !APIC_XAPIC(boot_cpu_apic_version))
return io_apic_get_unique_id(idx, id);
else
return id;