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x86, uv: Update UV arch to target Legacy VGA I/O correctly.

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Add function to direct Legacy VGA I/O traffic to correct I/O Hub.

Signed-off-by: Mike Travis <travis@sgi.com>
LKML-Reference: <201002022238.o12McEbi018727@imap1.linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Robin Holt <holt@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Mike Travis 2010-02-02 14:38:14 -08:00 committed by H. Peter Anvin
parent 95a8b6efc5
commit 841582ea9e
3 changed files with 52 additions and 1 deletions
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4
arch/x86/include/asm/uv/bios.h
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@ -36,7 +36,8 @@ enum uv_bios_cmd {
UV_BIOS_WATCHLIST_ALLOC,
UV_BIOS_WATCHLIST_FREE,
UV_BIOS_MEMPROTECT,
UV_BIOS_GET_PARTITION_ADDR
UV_BIOS_GET_PARTITION_ADDR,
UV_BIOS_SET_LEGACY_VGA_TARGET
};
/*
@ -96,6 +97,7 @@ extern int uv_bios_mq_watchlist_alloc(unsigned long, unsigned int,
extern int uv_bios_mq_watchlist_free(int, int);
extern s64 uv_bios_change_memprotect(u64, u64, enum uv_memprotect);
extern s64 uv_bios_reserved_page_pa(u64, u64 *, u64 *, u64 *);
extern int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus);
extern void uv_bios_init(void);

30
arch/x86/kernel/apic/x2apic_uv_x.c
View File

@ -20,6 +20,7 @@
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/pci.h>
#include <asm/uv/uv_mmrs.h>
#include <asm/uv/uv_hub.h>
@ -34,6 +35,8 @@
DEFINE_PER_CPU(int, x2apic_extra_bits);
#define PR_DEVEL(fmt, args...) pr_devel("%s: " fmt, __func__, args)
static enum uv_system_type uv_system_type;
static u64 gru_start_paddr, gru_end_paddr;
int uv_min_hub_revision_id;
@ -553,6 +556,30 @@ late_initcall(uv_init_heartbeat);
#endif /* !CONFIG_HOTPLUG_CPU */
/* Direct Legacy VGA I/O traffic to designated IOH */
int uv_set_vga_state(struct pci_dev *pdev, bool decode,
unsigned int command_bits, bool change_bridge)
{
int domain, bus, rc;
PR_DEVEL("devfn %x decode %d cmd %x chg_brdg %d\n",
pdev->devfn, decode, command_bits, change_bridge);
if (!change_bridge)
return 0;
if ((command_bits & PCI_COMMAND_IO) == 0)
return 0;
domain = pci_domain_nr(pdev->bus);
bus = pdev->bus->number;
rc = uv_bios_set_legacy_vga_target(decode, domain, bus);
PR_DEVEL("vga decode %d %x:%x, rc: %d\n", decode, domain, bus, rc);
return rc;
}
/*
* Called on each cpu to initialize the per_cpu UV data area.
* FIXME: hotplug not supported yet
@ -691,4 +718,7 @@ void __init uv_system_init(void)
uv_cpu_init();
uv_scir_register_cpu_notifier();
proc_mkdir("sgi_uv", NULL);
/* register Legacy VGA I/O redirection handler */
pci_register_set_vga_state(uv_set_vga_state);
}

19
arch/x86/kernel/bios_uv.c
View File

@ -154,6 +154,25 @@ s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
}
EXPORT_SYMBOL_GPL(uv_bios_freq_base);
/*
* uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
* @decode: true to enable target, false to disable target
* @domain: PCI domain number
* @bus: PCI bus number
*
* Returns:
* 0: Success
* -EINVAL: Invalid domain or bus number
* -ENOSYS: Capability not available
* -EBUSY: Legacy VGA I/O cannot be retargeted at this time
*/
int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
{
return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
(u64)decode, (u64)domain, (u64)bus, 0, 0);
}
EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
#ifdef CONFIG_EFI
void uv_bios_init(void)