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Message-ID: <20240117124902.600583242@linutronix.de>
Date: Tue, 23 Jan 2024 14:10:08 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org,
Tom Lendacky <thomas.lendacky@....com>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Arjan van de Ven <arjan@...ux.intel.com>,
Huang Rui <ray.huang@....com>,
Juergen Gross <jgross@...e.com>,
Dimitri Sivanich <dimitri.sivanich@....com>,
Sohil Mehta <sohil.mehta@...el.com>,
K Prateek Nayak <kprateek.nayak@....com>,
Kan Liang <kan.liang@...ux.intel.com>,
Zhang Rui <rui.zhang@...el.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Feng Tang <feng.tang@...el.com>,
Andy Shevchenko <andy@...radead.org>,
Michael Kelley <mhklinux@...look.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Wei Liu <wei.liu@...nel.org>
Subject: [patch V2 04/22] x86/apic: Get rid of get_physical_broadcast()
From: Thomas Gleixner <tglx@...utronix.de>
There is no point for this function. The only case where this is used is
when there is no XAPIC available, which means the broadcast address is 0xF.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Andy Shevchenko <andy@...radead.org>
---
arch/x86/kernel/apic/apic.c | 10 --------
arch/x86/kernel/apic/io_apic.c | 47 ++++++++++++++++++-----------------------
2 files changed, 21 insertions(+), 36 deletions(-)
---
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -261,16 +261,6 @@ 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(FW_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(FW_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 {
@@ -2209,7 +2207,7 @@ static inline void __init check_timer(vo
* 8259A.
*/
if (pin1 == -1) {
- panic_if_irq_remap("BIOS bug: timer not connected to IO-APIC");
+ panic_if_irq_remap(FW_BUG "Timer not connected to IO-APIC");
pin1 = pin2;
apic1 = apic2;
no_pin1 = 1;
@@ -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;
}
@@ -2567,11 +2564,9 @@ 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;
+ return id;
}
#else
static u8 io_apic_unique_id(int idx, u8 id)
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