[Xen-changelog] [xen staging] console: adjust IRQ initialization

[patchbot@xxxxxxx]

commit 69343d5af45076e5b196833f3082acf6f7248299
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Dec 6 12:20:55 2018 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Dec 6 12:20:55 2018 +0100

    console: adjust IRQ initialization
    
    In order for a Xen internal PCI device driver to enable MSI on the
    device, we need another hook which the driver can use to create the IRQ
    (doing this in the init_preirq hook is too early, since IRQ code hasn't
    got initialized at that time yet, and doing it in init_postirq is too
    late because at least on x86 smp_intr_init() needs to know the IRQ
    number).
    
    On x86 this additionally requires a slight ordering change to IRQ
    initialization, to facilitate calling the new hook between basic
    initialization and the call path leading to smp_intr_init().
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/i8259.c       | 2 --
 xen/arch/x86/setup.c       | 9 ++++++++-
 xen/drivers/char/console.c | 5 +++++
 xen/drivers/char/serial.c  | 9 +++++++++
 xen/include/xen/console.h  | 1 +
 xen/include/xen/serial.h   | 4 +++-
 6 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/i8259.c b/xen/arch/x86/i8259.c
index 166ca1a3e1..357ffcd085 100644
--- a/xen/arch/x86/i8259.c
+++ b/xen/arch/x86/i8259.c
@@ -341,8 +341,6 @@ void __init init_IRQ(void)
 
     init_8259A(0);
 
-    BUG_ON(init_irq_data() < 0);
-
     for (irq = 0; platform_legacy_irq(irq); irq++) {
         struct irq_desc *desc = irq_to_desc(irq);
         
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 9cbff22fb3..06eb483cb4 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -677,6 +677,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
     unsigned long nr_pages, raw_max_page, modules_headroom, *module_map;
     int i, j, e820_warn = 0, bytes = 0;
     bool acpi_boot_table_init_done = false, relocated = false;
+    int ret;
     struct ns16550_defaults ns16550 = {
         .data_bits = 8,
         .parity    = 'n',
@@ -1563,6 +1564,12 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     x2apic_bsp_setup();
 
+    ret = init_irq_data();
+    if ( ret < 0 )
+        panic("Error %d setting up IRQ data\n", ret);
+
+    console_init_irq();
+
     init_IRQ();
 
     module_map = xmalloc_array(unsigned long, BITS_TO_LONGS(mbi->mods_count));
@@ -1665,7 +1672,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
             if ( (park_offline_cpus || num_online_cpus() < max_cpus) &&
                  !cpu_online(i) )
             {
-                int ret = cpu_up(i);
+                ret = cpu_up(i);
                 if ( ret != 0 )
                     printk("Failed to bring up CPU %u (error %d)\n", i, ret);
                 else if ( num_online_cpus() > max_cpus ||
diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index 675193a272..4315588f05 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -972,6 +972,11 @@ void __init console_init_ring(void)
     printk("Allocated console ring of %u KiB.\n", opt_conring_size >> 10);
 }
 
+void __init console_init_irq(void)
+{
+    serial_init_irq();
+}
+
 void __init console_init_postirq(void)
 {
     serial_init_postirq();
diff --git a/xen/drivers/char/serial.c b/xen/drivers/char/serial.c
index 09a20ac2de..221a14c092 100644
--- a/xen/drivers/char/serial.c
+++ b/xen/drivers/char/serial.c
@@ -503,6 +503,15 @@ void __init serial_init_preirq(void)
             com[i].driver->init_preirq(&com[i]);
 }
 
+void __init serial_init_irq(void)
+{
+    unsigned int i;
+
+    for ( i = 0; i < ARRAY_SIZE(com); i++ )
+        if ( com[i].driver && com[i].driver->init_irq )
+            com[i].driver->init_irq(&com[i]);
+}
+
 void __init serial_init_postirq(void)
 {
     int i;
diff --git a/xen/include/xen/console.h b/xen/include/xen/console.h
index c5a85c8f6a..b4f9463936 100644
--- a/xen/include/xen/console.h
+++ b/xen/include/xen/console.h
@@ -15,6 +15,7 @@ long read_console_ring(struct xen_sysctl_readconsole *op);
 
 void console_init_preirq(void);
 void console_init_ring(void);
+void console_init_irq(void);
 void console_init_postirq(void);
 void console_endboot(void);
 int console_has(const char *device);
diff --git a/xen/include/xen/serial.h b/xen/include/xen/serial.h
index 1212a12720..f2994d4093 100644
--- a/xen/include/xen/serial.h
+++ b/xen/include/xen/serial.h
@@ -64,6 +64,7 @@ struct serial_port {
 struct uart_driver {
     /* Driver initialisation (pre- and post-IRQ subsystem setup). */
     void (*init_preirq)(struct serial_port *);
+    void (*init_irq)(struct serial_port *);
     void (*init_postirq)(struct serial_port *);
     /* Hook to clean up after Xen bootstrap (before domain 0 runs). */
     void (*endboot)(struct serial_port *);
@@ -99,8 +100,9 @@ struct uart_driver {
 #define SERHND_LO       (1<<3) /* Ditto, except that the MSB is cleared.  */
 #define SERHND_COOKED   (1<<4) /* Newline/carriage-return translation?    */
 
-/* Two-stage initialisation (before/after IRQ-subsystem initialisation). */
+/* Three-stage initialisation (before/during/after IRQ-subsystem setup). */
 void serial_init_preirq(void);
+void serial_init_irq(void);
 void serial_init_postirq(void);
 
 /* Clean-up hook before domain 0 runs. */
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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