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From: Sam Ravnborg via B4 Relay <devnull+sam.ravnborg.org@kernel.org>
Date: Tue, 19 Dec 2023 23:03:12 +0100
Subject: [PATCH 07/27] sparc32: Drop run-time patching of ipi trap
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Message-Id: <20231219-sam-sparc32-sunset-v3-v1-7-64bb44b598c5@ravnborg.org>
References: <20231219-sam-sparc32-sunset-v3-v1-0-64bb44b598c5@ravnborg.org>
In-Reply-To: <20231219-sam-sparc32-sunset-v3-v1-0-64bb44b598c5@ravnborg.org>
To: "David S. Miller" <davem@davemloft.net>, 
 Arnd Bergmann <arnd@kernel.org>, Andreas Larsson <andreas@gaisler.com>
Cc: Helge Deller <deller@gmx.de>, Alexander Viro <viro@zeniv.linux.org.uk>, 
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>, 
 Alan Stern <stern@rowland.harvard.edu>, Jaroslav Kysela <perex@perex.cz>, 
 Takashi Iwai <tiwai@suse.com>, sparclinux@vger.kernel.org, 
 linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, 
 linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, 
 linux-sound@vger.kernel.org, Sam Ravnborg <sam@ravnborg.org>
Reply-To: <sam@ravnborg.org>

From: Sam Ravnborg <sam@ravnborg.org>

There is no longer any need for the run-time patching of the ipi trap
with the removal of sun4m and sun4d. Remove the patching and drop the
ipi implementation for the two machines.

The patch includes removal of patching from pcic as this was needed to
fix the build. pcic will be removed in a later commit.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Andreas Larsson <andreas@gaisler.com>
---
 arch/sparc/kernel/entry.S     | 70 ++-----------------------------------------
 arch/sparc/kernel/kernel.h    |  4 ---
 arch/sparc/kernel/leon_smp.c  |  3 --
 arch/sparc/kernel/pcic.c      | 11 -------
 arch/sparc/kernel/sun4d_smp.c |  3 --
 arch/sparc/kernel/ttable_32.S |  9 +++---
 6 files changed, 7 insertions(+), 93 deletions(-)

diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index c6a5cb949381..7cf148a996b9 100644
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -174,32 +174,6 @@ maybe_smp4m_msg_check_resched:
 maybe_smp4m_msg_out:
 	RESTORE_ALL
 
-	.align	4
-	.globl	linux_trap_ipi15_sun4m
-linux_trap_ipi15_sun4m:
-	SAVE_ALL
-	sethi	%hi(0x80000000), %o2
-	GET_PROCESSOR4M_ID(o0)
-	sethi	%hi(sun4m_irq_percpu), %l5
-	or	%l5, %lo(sun4m_irq_percpu), %o5
-	sll	%o0, 2, %o0
-	ld	[%o5 + %o0], %o5
-	ld	[%o5 + 0x00], %o3	! sun4m_irq_percpu[cpu]->pending
-	andcc	%o3, %o2, %g0
-	be	sun4m_nmi_error		! Must be an NMI async memory error
-	 st	%o2, [%o5 + 0x04]	! sun4m_irq_percpu[cpu]->clear=0x80000000
-	WRITE_PAUSE
-	ld	[%o5 + 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
-	call	smp4m_cross_call_irq
-	 nop
-	b	ret_trap_lockless_ipi
-	 clr	%l6
 
 	.globl	smp4d_ticker
 	/* SMP per-cpu ticker interrupts are handled specially. */
@@ -220,44 +194,6 @@ smp4d_ticker:
 	WRITE_PAUSE
 	RESTORE_ALL
 
-	.align	4
-	.globl	linux_trap_ipi15_sun4d
-linux_trap_ipi15_sun4d:
-	SAVE_ALL
-	sethi	%hi(CC_BASE), %o4
-	sethi	%hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
-	or	%o4, (CC_EREG - CC_BASE), %o0
-	ldda	[%o0] ASI_M_MXCC, %o0
-	andcc	%o0, %o2, %g0
-	bne	1f
-	 sethi	%hi(BB_STAT2), %o2
-	lduba	[%o2] ASI_M_CTL, %o2
-	andcc	%o2, BB_STAT2_MASK, %g0
-	bne	2f
-	 or	%o4, (CC_ICLR - CC_BASE), %o0
-	sethi	%hi(1 << 15), %o1
-	stha	%o1, [%o0] ASI_M_MXCC	/* Clear PIL 15 in MXCC's ICLR */
-	or	%l0, PSR_PIL, %l4
-	wr	%l4, 0x0, %psr
-	WRITE_PAUSE
-	wr	%l4, PSR_ET, %psr
-	WRITE_PAUSE
-	call	smp4d_cross_call_irq
-	 nop
-	b	ret_trap_lockless_ipi
-	 clr	%l6
-
-1:	/* MXCC error */
-2:	/* BB error */
-	/* Disable PIL 15 */
-	set	CC_IMSK, %l4
-	lduha	[%l4] ASI_M_MXCC, %l5
-	sethi	%hi(1 << 15), %l7
-	or	%l5, %l7, %l5
-	stha	%l5, [%l4] ASI_M_MXCC
-	/* FIXME */
-1:	b,a	1b
-
 	.globl	smpleon_ipi
 	.extern leon_ipi_interrupt
 	/* SMP per-cpu IPI interrupts are handled specially. */
@@ -618,11 +554,11 @@ sun4m_nmi_error:
 
 #ifndef CONFIG_SMP
 	.align	4
-	.globl	linux_trap_ipi15_sun4m
-linux_trap_ipi15_sun4m:
+	.globl	linux_trap_ipi15_leon
+linux_trap_ipi15_leon:
 	SAVE_ALL
 
-	ba	sun4m_nmi_error
+	ba      sun4m_nmi_error
 	 nop
 #endif /* CONFIG_SMP */
 
diff --git a/arch/sparc/kernel/kernel.h b/arch/sparc/kernel/kernel.h
index c8ba3bc7e137..1d3980ac0658 100644
--- a/arch/sparc/kernel/kernel.h
+++ b/arch/sparc/kernel/kernel.h
@@ -134,10 +134,6 @@ void leonsmp_ipi_interrupt(void);
 void leon_cross_call_irq(void);
 
 /* head_32.S */
-extern unsigned int t_nmi[];
-extern unsigned int linux_trap_ipi15_sun4d[];
-extern unsigned int linux_trap_ipi15_sun4m[];
-
 extern struct tt_entry trapbase;
 extern struct tt_entry trapbase_cpu1;
 extern struct tt_entry trapbase_cpu2;
diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c
index 991e9ad3d3e8..42820c7422dd 100644
--- a/arch/sparc/kernel/leon_smp.c
+++ b/arch/sparc/kernel/leon_smp.c
@@ -463,8 +463,5 @@ static const struct sparc32_ipi_ops leon_ipi_ops = {
 
 void __init leon_init_smp(void)
 {
-	/* Patch ipi15 trap table */
-	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
-
 	sparc32_ipi_ops = &leon_ipi_ops;
 }
diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c
index 25fe0a061732..d952bcbbc395 100644
--- a/arch/sparc/kernel/pcic.c
+++ b/arch/sparc/kernel/pcic.c
@@ -354,17 +354,6 @@ int __init pcic_probe(void)
 	prom_getstring(node, "name", namebuf, 63);  namebuf[63] = 0;
 	strcpy(pbm->prom_name, namebuf);
 
-	{
-		extern int pcic_nmi_trap_patch[4];
-
-		t_nmi[0] = pcic_nmi_trap_patch[0];
-		t_nmi[1] = pcic_nmi_trap_patch[1];
-		t_nmi[2] = pcic_nmi_trap_patch[2];
-		t_nmi[3] = pcic_nmi_trap_patch[3];
-		swift_flush_dcache();
-		pcic_regs = pcic->pcic_regs;
-	}
-
 	prom_getstring(prom_root_node, "name", namebuf, 63);  namebuf[63] = 0;
 	{
 		struct pcic_sn2list *p;
diff --git a/arch/sparc/kernel/sun4d_smp.c b/arch/sparc/kernel/sun4d_smp.c
index 9a62a5cf3337..be5bcbee1af4 100644
--- a/arch/sparc/kernel/sun4d_smp.c
+++ b/arch/sparc/kernel/sun4d_smp.c
@@ -403,9 +403,6 @@ void __init sun4d_init_smp(void)
 {
 	int i;
 
-	/* Patch ipi15 trap table */
-	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
-
 	sparc32_ipi_ops = &sun4d_ipi_ops;
 
 	for (i = 0; i < NR_CPUS; i++) {
diff --git a/arch/sparc/kernel/ttable_32.S b/arch/sparc/kernel/ttable_32.S
index e79fd786fbbb..78bbf2548e1f 100644
--- a/arch/sparc/kernel/ttable_32.S
+++ b/arch/sparc/kernel/ttable_32.S
@@ -43,8 +43,7 @@ t_irq12:TRAP_ENTRY_INTERRUPT(12)            /* IRQ Zilog serial chip         */
 t_irq13:TRAP_ENTRY_INTERRUPT(13)            /* IRQ Audio Intr.               */
 t_irq14:TRAP_ENTRY_INTERRUPT(14)            /* IRQ Timer #2                  */
 
-	.globl	t_nmi
-t_nmi:	TRAP_ENTRY(0x1f, linux_trap_ipi15_sun4m)
+t_nmi:	TRAP_ENTRY(0x1f, linux_trap_ipi15_leon)
 
 t_racc:	TRAP_ENTRY(0x20, do_reg_access)     /* General Register Access Error */
 t_iacce:BAD_TRAP(0x21)                      /* Instr Access Error            */
@@ -146,7 +145,7 @@ trapbase_cpu1:
 	TRAP_ENTRY_INTERRUPT(9) TRAP_ENTRY_INTERRUPT(10)
 	TRAP_ENTRY_INTERRUPT(11) TRAP_ENTRY_INTERRUPT(12)
 	TRAP_ENTRY_INTERRUPT(13) TRAP_ENTRY_INTERRUPT(14)
-	TRAP_ENTRY(0x1f, linux_trap_ipi15_sun4m)
+	TRAP_ENTRY(0x1f, linux_trap_ipi15_leon)
 	TRAP_ENTRY(0x20, do_reg_access)
 	BAD_TRAP(0x21)
 	BAD_TRAP(0x22)
@@ -245,7 +244,7 @@ trapbase_cpu2:
 	TRAP_ENTRY_INTERRUPT(12)
 	TRAP_ENTRY_INTERRUPT(13)
 	TRAP_ENTRY_INTERRUPT(14)
-	TRAP_ENTRY(0x1f, linux_trap_ipi15_sun4m)
+	TRAP_ENTRY(0x1f, linux_trap_ipi15_leon)
 	TRAP_ENTRY(0x20, do_reg_access)
 	BAD_TRAP(0x21)
 	BAD_TRAP(0x22)
@@ -345,7 +344,7 @@ trapbase_cpu3:
 	TRAP_ENTRY_INTERRUPT(12)
 	TRAP_ENTRY_INTERRUPT(13)
 	TRAP_ENTRY_INTERRUPT(14)
-	TRAP_ENTRY(0x1f, linux_trap_ipi15_sun4m)
+	TRAP_ENTRY(0x1f, linux_trap_ipi15_leon)
 	TRAP_ENTRY(0x20, do_reg_access)
 	BAD_TRAP(0x21)
 	BAD_TRAP(0x22)

-- 
2.34.1