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Message-Id: <20231219-sam-sparc32-sunset-v3-v1-8-64bb44b598c5@ravnborg.org>
Date: Tue, 19 Dec 2023 23:03:13 +0100
From: Sam Ravnborg via B4 Relay <devnull+sam.ravnborg.org@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Arnd Bergmann <arnd@...nel.org>, Andreas Larsson <andreas@...sler.com>
Cc: Helge Deller <deller@....de>, Alexander Viro <viro@...iv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alan Stern <stern@...land.harvard.edu>, Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, sparclinux@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-sound@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH 08/27] sparc32: Drop patching of interrupt vector
From: Sam Ravnborg <sam@...nborg.org>
Drop the sun4m specific handling and the patching that
takes place in sun4d and LEON.
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Arnd Bergmann <arnd@...nel.org>
Cc: Andreas Larsson <andreas@...sler.com>
---
arch/sparc/kernel/entry.S | 98 -----------------------------------------
arch/sparc/kernel/kernel.h | 1 -
arch/sparc/kernel/leon_kernel.c | 16 -------
arch/sparc/kernel/sun4d_irq.c | 25 -----------
4 files changed, 140 deletions(-)
diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index 7cf148a996b9..9bd3813b872d 100644
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -79,15 +79,6 @@ bad_trap_handler:
real_irq_entry:
SAVE_ALL
-#ifdef CONFIG_SMP
- .globl patchme_maybe_smp_msg
-
- cmp %l7, 11
-patchme_maybe_smp_msg:
- bgu maybe_smp4m_msg
- nop
-#endif
-
real_irq_continue:
or %l0, PSR_PIL, %g2
wr %g2, 0x0, %psr
@@ -105,95 +96,6 @@ patch_handler_irq:
RESTORE_ALL
#ifdef CONFIG_SMP
- /* SMP per-cpu ticker interrupts are handled specially. */
-smp4m_ticker:
- bne real_irq_continue+4
- or %l0, PSR_PIL, %g2
- wr %g2, 0x0, %psr
- WRITE_PAUSE
- wr %g2, PSR_ET, %psr
- WRITE_PAUSE
- call smp4m_percpu_timer_interrupt
- add %sp, STACKFRAME_SZ, %o0
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- RESTORE_ALL
-
-#define GET_PROCESSOR4M_ID(reg) \
- rd %tbr, %reg; \
- srl %reg, 12, %reg; \
- and %reg, 3, %reg;
-
- /* Here is where we check for possible SMP IPI passed to us
- * on some level other than 15 which is the NMI and only used
- * for cross calls. That has a separate entry point below.
- *
- * IPIs are sent on Level 12, 13 and 14. See IRQ_IPI_*.
- */
-maybe_smp4m_msg:
- GET_PROCESSOR4M_ID(o3)
- sethi %hi(sun4m_irq_percpu), %l5
- sll %o3, 2, %o3
- or %l5, %lo(sun4m_irq_percpu), %o5
- sethi %hi(0x70000000), %o2 ! Check all soft-IRQs
- ld [%o5 + %o3], %o1
- ld [%o1 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
- andcc %o3, %o2, %g0
- be,a smp4m_ticker
- cmp %l7, 14
- /* Soft-IRQ IPI */
- st %o2, [%o1 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x70000000
- WRITE_PAUSE
- ld [%o1 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
- WRITE_PAUSE
- or %l0, PSR_PIL, %l4
- wr %l4, 0x0, %psr
- WRITE_PAUSE
- wr %l4, PSR_ET, %psr
- WRITE_PAUSE
- srl %o3, 28, %o2 ! shift for simpler checks below
-maybe_smp4m_msg_check_single:
- andcc %o2, 0x1, %g0
- beq,a maybe_smp4m_msg_check_mask
- andcc %o2, 0x2, %g0
- call smp_call_function_single_interrupt
- nop
- andcc %o2, 0x2, %g0
-maybe_smp4m_msg_check_mask:
- beq,a maybe_smp4m_msg_check_resched
- andcc %o2, 0x4, %g0
- call smp_call_function_interrupt
- nop
- andcc %o2, 0x4, %g0
-maybe_smp4m_msg_check_resched:
- /* rescheduling is done in RESTORE_ALL regardless, but incr stats */
- beq,a maybe_smp4m_msg_out
- nop
- call smp_resched_interrupt
- nop
-maybe_smp4m_msg_out:
- RESTORE_ALL
-
-
- .globl smp4d_ticker
- /* SMP per-cpu ticker interrupts are handled specially. */
-smp4d_ticker:
- SAVE_ALL
- or %l0, PSR_PIL, %g2
- sethi %hi(CC_ICLR), %o0
- sethi %hi(1 << 14), %o1
- or %o0, %lo(CC_ICLR), %o0
- stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
- wr %g2, 0x0, %psr
- WRITE_PAUSE
- wr %g2, PSR_ET, %psr
- WRITE_PAUSE
- call smp4d_percpu_timer_interrupt
- add %sp, STACKFRAME_SZ, %o0
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- RESTORE_ALL
-
.globl smpleon_ipi
.extern leon_ipi_interrupt
/* SMP per-cpu IPI interrupts are handled specially. */
diff --git a/arch/sparc/kernel/kernel.h b/arch/sparc/kernel/kernel.h
index 1d3980ac0658..85a3c3d1195e 100644
--- a/arch/sparc/kernel/kernel.h
+++ b/arch/sparc/kernel/kernel.h
@@ -145,7 +145,6 @@ extern char cputypval[];
extern unsigned long lvl14_save[4];
extern unsigned int real_irq_entry[];
extern unsigned int smp4d_ticker[];
-extern unsigned int patchme_maybe_smp_msg[];
/* trampoline_32.S */
extern unsigned long sun4m_cpu_startup;
diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
index 4c61da491fee..ea04bad6a118 100644
--- a/arch/sparc/kernel/leon_kernel.c
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -421,22 +421,6 @@ void __init leon_init_timers(void)
if (eirq != 0)
leon_eirq_setup(eirq);
-#ifdef CONFIG_SMP
- {
- unsigned long flags;
-
- /*
- * In SMP, sun4m adds a IPI handler to IRQ trap handler that
- * LEON never must take, sun4d and LEON overwrites the branch
- * with a NOP.
- */
- local_irq_save(flags);
- patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
- local_ops->cache_all();
- local_irq_restore(flags);
- }
-#endif
-
config = LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config);
if (config & (1 << LEON3_GPTIMER_SEPIRQ))
leon3_gptimer_irq += leon3_gptimer_idx;
diff --git a/arch/sparc/kernel/sun4d_irq.c b/arch/sparc/kernel/sun4d_irq.c
index 9a137c70e8d1..7140cff04b54 100644
--- a/arch/sparc/kernel/sun4d_irq.c
+++ b/arch/sparc/kernel/sun4d_irq.c
@@ -391,30 +391,6 @@ static unsigned int sun4d_build_timer_irq(unsigned int board,
}
-static void __init sun4d_fixup_trap_table(void)
-{
-#ifdef CONFIG_SMP
- unsigned long flags;
- struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
-
- /* Adjust so that we jump directly to smp4d_ticker */
- lvl14_save[2] += smp4d_ticker - real_irq_entry;
-
- /* For SMP we use the level 14 ticker, however the bootup code
- * has copied the firmware's level 14 vector into the boot cpu's
- * trap table, we must fix this now or we get squashed.
- */
- local_irq_save(flags);
- patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
- trap_table->inst_one = lvl14_save[0];
- trap_table->inst_two = lvl14_save[1];
- trap_table->inst_three = lvl14_save[2];
- trap_table->inst_four = lvl14_save[3];
- local_ops->cache_all();
- local_irq_restore(flags);
-#endif
-}
-
static void __init sun4d_init_timers(void)
{
struct device_node *dp;
@@ -478,7 +454,6 @@ static void __init sun4d_init_timers(void)
prom_halt();
}
sun4d_load_profile_irqs();
- sun4d_fixup_trap_table();
}
void __init sun4d_init_sbi_irq(void)
--
2.34.1
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