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CVS Update@linux-mips.org: linux

To: linux-cvs-patches@linux-mips.org
Subject: CVS Update@linux-mips.org: linux
From: ralf@linux-mips.org
Date: Sat, 20 Aug 2005 15:27:23 +0100
Reply-to: linux-mips@linux-mips.org
Sender: linux-cvs-patches-bounce@linux-mips.org
CVSROOT:        /home/cvs
Module name:    linux
Changes by:     ralf@ftp.linux-mips.org 05/08/20 15:27:17

Modified files:
        arch/mips/kernel: irq_cpu.c 

Log message:
        MT bulletproofing; MT also uses the software interrupts.

diff -urN linux/arch/mips/kernel/irq_cpu.c linux/arch/mips/kernel/irq_cpu.c
--- linux/arch/mips/kernel/irq_cpu.c    2005/08/09 15:23:49     1.12
+++ linux/arch/mips/kernel/irq_cpu.c    2005/08/20 14:27:17     1.13
@@ -33,6 +33,7 @@
 
 #include <asm/irq_cpu.h>
 #include <asm/mipsregs.h>
+#include <asm/mipsmtregs.h>
 #include <asm/system.h>
 
 static int mips_cpu_irq_base;
@@ -76,7 +77,7 @@
        return 0;
 }
 
-#define        mips_cpu_irq_shutdown   mips_cpu_irq_disable
+#define        mips_cpu_irq_shutdown           mips_cpu_irq_disable
 
 /*
  * While we ack the interrupt interrupts are disabled and thus we don't need
@@ -84,9 +85,6 @@
  */
 static void mips_cpu_irq_ack(unsigned int irq)
 {
-       /* Only necessary for soft interrupts */
-       clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
-
        mask_mips_irq(irq);
 }
 
@@ -97,15 +95,60 @@
 }
 
 static hw_irq_controller mips_cpu_irq_controller = {
-       .typename = "MIPS",
-       .startup = mips_cpu_irq_startup,
-       .shutdown = mips_cpu_irq_shutdown,
-       .enable = mips_cpu_irq_enable,
-       .disable = mips_cpu_irq_disable,
-       .ack = mips_cpu_irq_ack,
-       .end = mips_cpu_irq_end,
+       .typename       = "MIPS",
+       .startup        = mips_cpu_irq_startup,
+       .shutdown       = mips_cpu_irq_shutdown,
+       .enable         = mips_cpu_irq_enable,
+       .disable        = mips_cpu_irq_disable,
+       .ack            = mips_cpu_irq_ack,
+       .end            = mips_cpu_irq_end,
 };
 
+/*
+ * Basically the same as above but taking care of all the MT stuff
+ */
+
+#define unmask_mips_mt_irq     unmask_mips_irq
+#define mask_mips_mt_irq       mask_mips_irq
+#define mips_mt_cpu_irq_enable mips_cpu_irq_enable
+#define mips_mt_cpu_irq_disable        mips_cpu_irq_disable
+
+static unsigned int mips_mt_cpu_irq_startup(unsigned int irq)
+{
+       unsigned int vpflags = dvpe();
+
+       clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
+       evpe(vpflags);
+       mips_mt_cpu_irq_enable(irq);
+
+       return 0;
+}
+
+#define        mips_mt_cpu_irq_shutdown        mips_mt_cpu_irq_disable
+
+/*
+ * While we ack the interrupt interrupts are disabled and thus we don't need
+ * to deal with concurrency issues.  Same for mips_cpu_irq_end.
+ */
+static void mips_mt_cpu_irq_ack(unsigned int irq)
+{
+       unsigned int vpflags = dvpe();
+       clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
+       evpe(vpflags);
+       mask_mips_mt_irq(irq);
+}
+
+#define mips_mt_cpu_irq_end mips_cpu_irq_end
+
+static hw_irq_controller mips_mt_cpu_irq_controller = {
+       .typename       = "MIPS",
+       .startup        = mips_mt_cpu_irq_startup,
+       .shutdown       = mips_mt_cpu_irq_shutdown,
+       .enable         = mips_mt_cpu_irq_enable,
+       .disable        = mips_mt_cpu_irq_disable,
+       .ack            = mips_mt_cpu_irq_ack,
+       .end            = mips_mt_cpu_irq_end,
+};
 
 void __init mips_cpu_irq_init(int irq_base)
 {
@@ -115,7 +158,19 @@
        clear_c0_status(ST0_IM);
        clear_c0_cause(CAUSEF_IP);
 
-       for (i = irq_base; i < irq_base + 8; i++) {
+       /*
+        * Only MT is using the software interrupts currently, so we just
+        * leave them uninitialized for other processors.
+        */
+       if (cpu_has_mipsmt)
+               for (i = irq_base; i < irq_base + 2; i++) {
+                       irq_desc[i].status = IRQ_DISABLED;
+                       irq_desc[i].action = NULL;
+                       irq_desc[i].depth = 1;
+                       irq_desc[i].handler = &mips_mt_cpu_irq_controller;
+               }
+
+       for (i = irq_base + 2; i < irq_base + 8; i++) {
                irq_desc[i].status = IRQ_DISABLED;
                irq_desc[i].action = NULL;
                irq_desc[i].depth = 1;

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