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PCI/VGA: Fix typos
Fix typos, rewrap to fill 78 columns, convert to conventional multi-line style. [bhelgaas: squash and add more fixes] Link: https://lore.kernel.org/r/20230808223412.1743176-7-sui.jingfeng@linux.dev Link: https://lore.kernel.org/r/20230808223412.1743176-9-sui.jingfeng@linux.dev Link: https://lore.kernel.org/r/20230808223412.1743176-10-sui.jingfeng@linux.dev Link: https://lore.kernel.org/r/20230808223412.1743176-11-sui.jingfeng@linux.dev Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
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cc64ca4b62
@ -1,6 +1,6 @@
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// SPDX-License-Identifier: MIT
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/*
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* vgaarb.c: Implements the VGA arbitration. For details refer to
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* vgaarb.c: Implements VGA arbitration. For details refer to
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* Documentation/gpu/vgaarbiter.rst
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*
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* (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -30,22 +30,21 @@
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#include <linux/vt.h>
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#include <linux/console.h>
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#include <linux/acpi.h>
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#include <linux/uaccess.h>
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#include <linux/vgaarb.h>
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static void vga_arbiter_notify_clients(void);
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/*
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* We keep a list of all vga devices in the system to speed
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* We keep a list of all VGA devices in the system to speed
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* up the various operations of the arbiter
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*/
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struct vga_device {
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struct list_head list;
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struct pci_dev *pdev;
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unsigned int decodes; /* what does it decodes */
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unsigned int owns; /* what does it owns */
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unsigned int locks; /* what does it locks */
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unsigned int decodes; /* what it decodes */
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unsigned int owns; /* what it owns */
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unsigned int locks; /* what it locks */
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unsigned int io_lock_cnt; /* legacy IO lock count */
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unsigned int mem_lock_cnt; /* legacy MEM lock count */
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unsigned int io_norm_cnt; /* normal IO count */
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@ -61,7 +60,6 @@ static bool vga_arbiter_used;
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static DEFINE_SPINLOCK(vga_lock);
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static DECLARE_WAIT_QUEUE_HEAD(vga_wait_queue);
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static const char *vga_iostate_to_str(unsigned int iostate)
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{
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/* Ignore VGA_RSRC_IO and VGA_RSRC_MEM */
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@ -79,14 +77,16 @@ static const char *vga_iostate_to_str(unsigned int iostate)
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static int vga_str_to_iostate(char *buf, int str_size, unsigned int *io_state)
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{
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/* we could in theory hand out locks on IO and mem
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* separately to userspace but it can cause deadlocks */
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/*
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* In theory, we could hand out locks on IO and MEM separately to
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* userspace, but this can cause deadlocks.
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*/
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if (strncmp(buf, "none", 4) == 0) {
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*io_state = VGA_RSRC_NONE;
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return 1;
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}
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/* XXX We're not chekcing the str_size! */
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/* XXX We're not checking the str_size! */
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if (strncmp(buf, "io+mem", 6) == 0)
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goto both;
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else if (strncmp(buf, "io", 2) == 0)
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@ -99,7 +99,7 @@ both:
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return 1;
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}
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/* this is only used a cookie - it should not be dereferenced */
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/* This is only used as a cookie, it should not be dereferenced */
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static struct pci_dev *vga_default;
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/* Find somebody in our list */
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@ -116,20 +116,18 @@ static struct vga_device *vgadev_find(struct pci_dev *pdev)
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/**
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* vga_default_device - return the default VGA device, for vgacon
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*
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* This can be defined by the platform. The default implementation
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* is rather dumb and will probably only work properly on single
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* vga card setups and/or x86 platforms.
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* This can be defined by the platform. The default implementation is
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* rather dumb and will probably only work properly on single VGA card
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* setups and/or x86 platforms.
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*
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* If your VGA default device is not PCI, you'll have to return
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* NULL here. In this case, I assume it will not conflict with
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* any PCI card. If this is not true, I'll have to define two archs
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* hooks for enabling/disabling the VGA default device if that is
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* possible. This may be a problem with real _ISA_ VGA cards, in
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* addition to a PCI one. I don't know at this point how to deal
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* with that card. Can theirs IOs be disabled at all ? If not, then
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* I suppose it's a matter of having the proper arch hook telling
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* us about it, so we basically never allow anybody to succeed a
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* vga_get()...
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* If your VGA default device is not PCI, you'll have to return NULL here.
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* In this case, I assume it will not conflict with any PCI card. If this
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* is not true, I'll have to define two arch hooks for enabling/disabling
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* the VGA default device if that is possible. This may be a problem with
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* real _ISA_ VGA cards, in addition to a PCI one. I don't know at this
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* point how to deal with that card. Can their IOs be disabled at all? If
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* not, then I suppose it's a matter of having the proper arch hook telling
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* us about it, so we basically never allow anybody to succeed a vga_get().
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*/
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struct pci_dev *vga_default_device(void)
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{
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@ -147,14 +145,13 @@ void vga_set_default_device(struct pci_dev *pdev)
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}
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/**
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* vga_remove_vgacon - deactivete vga console
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* vga_remove_vgacon - deactivate VGA console
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*
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* Unbind and unregister vgacon in case pdev is the default vga
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* device. Can be called by gpu drivers on initialization to make
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* sure vga register access done by vgacon will not disturb the
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* device.
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* Unbind and unregister vgacon in case pdev is the default VGA device.
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* Can be called by GPU drivers on initialization to make sure VGA register
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* access done by vgacon will not disturb the device.
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*
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* @pdev: pci device.
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* @pdev: PCI device.
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*/
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#if !defined(CONFIG_VGA_CONSOLE)
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int vga_remove_vgacon(struct pci_dev *pdev)
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@ -193,14 +190,17 @@ int vga_remove_vgacon(struct pci_dev *pdev)
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#endif
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EXPORT_SYMBOL(vga_remove_vgacon);
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/* If we don't ever use VGA arb we should avoid
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turning off anything anywhere due to old X servers getting
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confused about the boot device not being VGA */
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/*
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* If we don't ever use VGA arbitration, we should avoid turning off
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* anything anywhere due to old X servers getting confused about the boot
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* device not being VGA.
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*/
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static void vga_check_first_use(void)
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{
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/* we should inform all GPUs in the system that
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* VGA arb has occurred and to try and disable resources
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* if they can */
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/*
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* Inform all GPUs in the system that VGA arbitration has occurred
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* so they can disable resources if possible.
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*/
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if (!vga_arbiter_used) {
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vga_arbiter_used = true;
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vga_arbiter_notify_clients();
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@ -216,7 +216,8 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
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unsigned int pci_bits;
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u32 flags = 0;
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/* Account for "normal" resources to lock. If we decode the legacy,
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/*
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* Account for "normal" resources to lock. If we decode the legacy,
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* counterpart, we need to request it as well
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*/
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if ((rsrc & VGA_RSRC_NORMAL_IO) &&
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@ -236,14 +237,15 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
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if (wants == 0)
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goto lock_them;
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/* We don't need to request a legacy resource, we just enable
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* appropriate decoding and go
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/*
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* We don't need to request a legacy resource, we just enable
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* appropriate decoding and go.
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*/
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legacy_wants = wants & VGA_RSRC_LEGACY_MASK;
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if (legacy_wants == 0)
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goto enable_them;
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/* Ok, we don't, let's find out how we need to kick off */
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/* Ok, we don't, let's find out who we need to kick off */
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list_for_each_entry(conflict, &vga_list, list) {
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unsigned int lwants = legacy_wants;
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unsigned int change_bridge = 0;
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@ -252,39 +254,44 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
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if (vgadev == conflict)
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continue;
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/* We have a possible conflict. before we go further, we must
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/*
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* We have a possible conflict. Before we go further, we must
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* check if we sit on the same bus as the conflicting device.
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* if we don't, then we must tie both IO and MEM resources
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* If we don't, then we must tie both IO and MEM resources
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* together since there is only a single bit controlling
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* VGA forwarding on P2P bridges
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* VGA forwarding on P2P bridges.
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*/
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if (vgadev->pdev->bus != conflict->pdev->bus) {
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change_bridge = 1;
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lwants = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
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}
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/* Check if the guy has a lock on the resource. If he does,
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* return the conflicting entry
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/*
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* Check if the guy has a lock on the resource. If he does,
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* return the conflicting entry.
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*/
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if (conflict->locks & lwants)
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return conflict;
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/* Ok, now check if it owns the resource we want. We can
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* lock resources that are not decoded, therefore a device
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/*
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* Ok, now check if it owns the resource we want. We can
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* lock resources that are not decoded; therefore a device
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* can own resources it doesn't decode.
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*/
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match = lwants & conflict->owns;
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if (!match)
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continue;
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/* looks like he doesn't have a lock, we can steal
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* them from him
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/*
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* Looks like he doesn't have a lock, we can steal them
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* from him.
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*/
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flags = 0;
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pci_bits = 0;
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/* If we can't control legacy resources via the bridge, we
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/*
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* If we can't control legacy resources via the bridge, we
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* also need to disable normal decoding.
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*/
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if (!conflict->bridge_has_one_vga) {
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@ -311,7 +318,8 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
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}
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enable_them:
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/* ok dude, we got it, everybody conflicting has been disabled, let's
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/*
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* Ok, we got it, everybody conflicting has been disabled, let's
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* enable us. Mark any bits in "owns" regardless of whether we
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* decoded them. We can lock resources we don't decode, therefore
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* we must track them via "owns".
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@ -353,8 +361,9 @@ static void __vga_put(struct vga_device *vgadev, unsigned int rsrc)
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vgaarb_dbg(dev, "%s\n", __func__);
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/* Update our counters, and account for equivalent legacy resources
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* if we decode them
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/*
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* Update our counters and account for equivalent legacy resources
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* if we decode them.
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*/
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if ((rsrc & VGA_RSRC_NORMAL_IO) && vgadev->io_norm_cnt > 0) {
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vgadev->io_norm_cnt--;
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@ -371,32 +380,34 @@ static void __vga_put(struct vga_device *vgadev, unsigned int rsrc)
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if ((rsrc & VGA_RSRC_LEGACY_MEM) && vgadev->mem_lock_cnt > 0)
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vgadev->mem_lock_cnt--;
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/* Just clear lock bits, we do lazy operations so we don't really
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* have to bother about anything else at this point
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/*
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* Just clear lock bits, we do lazy operations so we don't really
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* have to bother about anything else at this point.
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*/
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if (vgadev->io_lock_cnt == 0)
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vgadev->locks &= ~VGA_RSRC_LEGACY_IO;
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if (vgadev->mem_lock_cnt == 0)
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vgadev->locks &= ~VGA_RSRC_LEGACY_MEM;
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/* Kick the wait queue in case somebody was waiting if we actually
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* released something
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/*
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* Kick the wait queue in case somebody was waiting if we actually
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* released something.
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*/
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if (old_locks != vgadev->locks)
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wake_up_all(&vga_wait_queue);
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}
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/**
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* vga_get - acquire & locks VGA resources
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* @pdev: pci device of the VGA card or NULL for the system default
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* vga_get - acquire & lock VGA resources
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* @pdev: PCI device of the VGA card or NULL for the system default
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* @rsrc: bit mask of resources to acquire and lock
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* @interruptible: blocking should be interruptible by signals ?
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*
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* This function acquires VGA resources for the given card and mark those
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* resources locked. If the resource requested are "normal" (and not legacy)
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* Acquire VGA resources for the given card and mark those resources
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* locked. If the resources requested are "normal" (and not legacy)
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* resources, the arbiter will first check whether the card is doing legacy
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* decoding for that type of resource. If yes, the lock is "converted" into a
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* legacy resource lock.
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* decoding for that type of resource. If yes, the lock is "converted" into
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* a legacy resource lock.
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*
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* The arbiter will first look for all VGA cards that might conflict and disable
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* their IOs and/or Memory access, including VGA forwarding on P2P bridges if
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@ -428,7 +439,7 @@ int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
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int rc = 0;
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vga_check_first_use();
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/* The one who calls us should check for this, but lets be sure... */
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/* The caller should check for this, but let's be sure */
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if (pdev == NULL)
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pdev = vga_default_device();
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if (pdev == NULL)
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@ -447,12 +458,12 @@ int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
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if (conflict == NULL)
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break;
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/* We have a conflict, we wait until somebody kicks the
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/*
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* We have a conflict; we wait until somebody kicks the
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* work queue. Currently we have one work queue that we
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* kick each time some resources are released, but it would
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* be fairly easy to have a per device one so that we only
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* need to attach to the conflicting device
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* be fairly easy to have a per-device one so that we only
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* need to attach to the conflicting device.
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*/
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init_waitqueue_entry(&wait, current);
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add_wait_queue(&vga_wait_queue, &wait);
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@ -474,12 +485,12 @@ EXPORT_SYMBOL(vga_get);
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/**
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* vga_tryget - try to acquire & lock legacy VGA resources
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* @pdev: pci devivce of VGA card or NULL for system default
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* @pdev: PCI device of VGA card or NULL for system default
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* @rsrc: bit mask of resources to acquire and lock
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*
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* This function performs the same operation as vga_get(), but will return an
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* error (-EBUSY) instead of blocking if the resources are already locked by
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* another card. It can be called in any context
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* Perform the same operation as vga_get(), but return an error (-EBUSY)
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* instead of blocking if the resources are already locked by another card.
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* Can be called in any context.
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*
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* On success, release the VGA resource again with vga_put().
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*
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@ -495,7 +506,7 @@ static int vga_tryget(struct pci_dev *pdev, unsigned int rsrc)
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vga_check_first_use();
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/* The one who calls us should check for this, but lets be sure... */
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/* The caller should check for this, but let's be sure */
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if (pdev == NULL)
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pdev = vga_default_device();
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if (pdev == NULL)
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@ -515,20 +526,20 @@ bail:
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/**
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* vga_put - release lock on legacy VGA resources
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* @pdev: pci device of VGA card or NULL for system default
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* @rsrc: but mask of resource to release
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* @pdev: PCI device of VGA card or NULL for system default
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* @rsrc: bit mask of resource to release
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*
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* This fuction releases resources previously locked by vga_get() or
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* vga_tryget(). The resources aren't disabled right away, so that a subsequence
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* vga_get() on the same card will succeed immediately. Resources have a
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* counter, so locks are only released if the counter reaches 0.
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* Release resources previously locked by vga_get() or vga_tryget(). The
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* resources aren't disabled right away, so that a subsequent vga_get() on
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* the same card will succeed immediately. Resources have a counter, so
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* locks are only released if the counter reaches 0.
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*/
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void vga_put(struct pci_dev *pdev, unsigned int rsrc)
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{
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struct vga_device *vgadev;
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unsigned long flags;
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/* The one who calls us should check for this, but lets be sure... */
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/* The caller should check for this, but let's be sure */
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if (pdev == NULL)
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pdev = vga_default_device();
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if (pdev == NULL)
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@ -665,7 +676,7 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
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}
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/*
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* vgadev has neither IO nor MEM enabled. If we haven't found any
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* Vgadev has neither IO nor MEM enabled. If we haven't found any
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* other VGA devices, it is the best candidate so far.
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*/
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if (!boot_vga)
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@ -696,20 +707,20 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
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return;
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}
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/* okay iterate the new devices bridge hierarachy */
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/* Iterate the new device's bridge hierarchy */
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new_bus = vgadev->pdev->bus;
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while (new_bus) {
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new_bridge = new_bus->self;
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/* go through list of devices already registered */
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/* Go through list of devices already registered */
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list_for_each_entry(same_bridge_vgadev, &vga_list, list) {
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bus = same_bridge_vgadev->pdev->bus;
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bridge = bus->self;
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/* see if the share a bridge with this device */
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/* See if it shares a bridge with this device */
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if (new_bridge == bridge) {
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/*
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* If their direct parent bridge is the same
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* If its direct parent bridge is the same
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* as any bridge of this device then it can't
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* be used for that device.
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*/
|
||||
@ -717,10 +728,10 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
|
||||
}
|
||||
|
||||
/*
|
||||
* Now iterate the previous devices bridge hierarchy.
|
||||
* If the new devices parent bridge is in the other
|
||||
* devices hierarchy then we can't use it to control
|
||||
* this device
|
||||
* Now iterate the previous device's bridge hierarchy.
|
||||
* If the new device's parent bridge is in the other
|
||||
* device's hierarchy, we can't use it to control this
|
||||
* device.
|
||||
*/
|
||||
while (bus) {
|
||||
bridge = bus->self;
|
||||
@ -741,10 +752,9 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
|
||||
}
|
||||
|
||||
/*
|
||||
* Currently, we assume that the "initial" setup of the system is
|
||||
* not sane, that is we come up with conflicting devices and let
|
||||
* the arbiter's client decides if devices decodes or not legacy
|
||||
* things.
|
||||
* Currently, we assume that the "initial" setup of the system is not sane,
|
||||
* that is, we come up with conflicting devices and let the arbiter's
|
||||
* client decide if devices decodes legacy things or not.
|
||||
*/
|
||||
static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
|
||||
{
|
||||
@ -763,7 +773,7 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
|
||||
if (vgadev == NULL) {
|
||||
vgaarb_err(&pdev->dev, "failed to allocate VGA arbiter data\n");
|
||||
/*
|
||||
* What to do on allocation failure ? For now, let's just do
|
||||
* What to do on allocation failure? For now, let's just do
|
||||
* nothing, I'm not sure there is anything saner to be done.
|
||||
*/
|
||||
return false;
|
||||
@ -781,10 +791,12 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
|
||||
vgadev->decodes = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
|
||||
VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
|
||||
|
||||
/* by default mark it as decoding */
|
||||
/* By default, mark it as decoding */
|
||||
vga_decode_count++;
|
||||
/* Mark that we "own" resources based on our enables, we will
|
||||
* clear that below if the bridge isn't forwarding
|
||||
|
||||
/*
|
||||
* Mark that we "own" resources based on our enables, we will
|
||||
* clear that below if the bridge isn't forwarding.
|
||||
*/
|
||||
pci_read_config_word(pdev, PCI_COMMAND, &cmd);
|
||||
if (cmd & PCI_COMMAND_IO)
|
||||
@ -864,7 +876,7 @@ bail:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* This is called with the lock */
|
||||
/* Called with the lock */
|
||||
static void vga_update_device_decodes(struct vga_device *vgadev,
|
||||
unsigned int new_decodes)
|
||||
{
|
||||
@ -889,7 +901,7 @@ static void vga_update_device_decodes(struct vga_device *vgadev,
|
||||
__vga_put(vgadev, decodes_unlocked);
|
||||
}
|
||||
|
||||
/* change decodes counter */
|
||||
/* Change decodes counter */
|
||||
if (old_decodes & VGA_RSRC_LEGACY_MASK &&
|
||||
!(new_decodes & VGA_RSRC_LEGACY_MASK))
|
||||
vga_decode_count--;
|
||||
@ -913,16 +925,17 @@ static void __vga_set_legacy_decoding(struct pci_dev *pdev,
|
||||
if (vgadev == NULL)
|
||||
goto bail;
|
||||
|
||||
/* don't let userspace futz with kernel driver decodes */
|
||||
/* Don't let userspace futz with kernel driver decodes */
|
||||
if (userspace && vgadev->set_decode)
|
||||
goto bail;
|
||||
|
||||
/* update the device decodes + counter */
|
||||
/* Update the device decodes + counter */
|
||||
vga_update_device_decodes(vgadev, decodes);
|
||||
|
||||
/* XXX if somebody is going from "doesn't decode" to "decodes" state
|
||||
* here, additional care must be taken as we may have pending owner
|
||||
* ship of non-legacy region ...
|
||||
/*
|
||||
* XXX If somebody is going from "doesn't decode" to "decodes"
|
||||
* state here, additional care must be taken as we may have pending
|
||||
* ownership of non-legacy region.
|
||||
*/
|
||||
bail:
|
||||
spin_unlock_irqrestore(&vga_lock, flags);
|
||||
@ -930,10 +943,10 @@ bail:
|
||||
|
||||
/**
|
||||
* vga_set_legacy_decoding
|
||||
* @pdev: pci device of the VGA card
|
||||
* @pdev: PCI device of the VGA card
|
||||
* @decodes: bit mask of what legacy regions the card decodes
|
||||
*
|
||||
* Indicates to the arbiter if the card decodes legacy VGA IOs, legacy VGA
|
||||
* Indicate to the arbiter if the card decodes legacy VGA IOs, legacy VGA
|
||||
* Memory, both, or none. All cards default to both, the card driver (fbdev for
|
||||
* example) should tell the arbiter if it has disabled legacy decoding, so the
|
||||
* card can be left out of the arbitration process (and can be safe to take
|
||||
@ -947,25 +960,25 @@ EXPORT_SYMBOL(vga_set_legacy_decoding);
|
||||
|
||||
/**
|
||||
* vga_client_register - register or unregister a VGA arbitration client
|
||||
* @pdev: pci device of the VGA client
|
||||
* @set_decode: vga decode change callback
|
||||
* @pdev: PCI device of the VGA client
|
||||
* @set_decode: VGA decode change callback
|
||||
*
|
||||
* Clients have two callback mechanisms they can use.
|
||||
*
|
||||
* @set_decode callback: If a client can disable its GPU VGA resource, it
|
||||
* will get a callback from this to set the encode/decode state.
|
||||
*
|
||||
* Rationale: we cannot disable VGA decode resources unconditionally some single
|
||||
* GPU laptops seem to require ACPI or BIOS access to the VGA registers to
|
||||
* control things like backlights etc. Hopefully newer multi-GPU laptops do
|
||||
* something saner, and desktops won't have any special ACPI for this. The
|
||||
* driver will get a callback when VGA arbitration is first used by userspace
|
||||
* since some older X servers have issues.
|
||||
* Rationale: we cannot disable VGA decode resources unconditionally
|
||||
* because some single GPU laptops seem to require ACPI or BIOS access to
|
||||
* the VGA registers to control things like backlights etc. Hopefully newer
|
||||
* multi-GPU laptops do something saner, and desktops won't have any
|
||||
* special ACPI for this. The driver will get a callback when VGA
|
||||
* arbitration is first used by userspace since some older X servers have
|
||||
* issues.
|
||||
*
|
||||
* This function does not check whether a client for @pdev has been registered
|
||||
* already.
|
||||
* Does not check whether a client for @pdev has been registered already.
|
||||
*
|
||||
* To unregister just call vga_client_unregister().
|
||||
* To unregister, call vga_client_unregister().
|
||||
*
|
||||
* Returns: 0 on success, -ENODEV on failure
|
||||
*/
|
||||
@ -991,13 +1004,13 @@ EXPORT_SYMBOL(vga_client_register);
|
||||
*
|
||||
* Semantics is:
|
||||
*
|
||||
* open : open user instance of the arbitrer. by default, it's
|
||||
* open : Open user instance of the arbiter. By default, it's
|
||||
* attached to the default VGA device of the system.
|
||||
*
|
||||
* close : close user instance, release locks
|
||||
* close : Close user instance, release locks
|
||||
*
|
||||
* read : return a string indicating the status of the target.
|
||||
* an IO state string is of the form {io,mem,io+mem,none},
|
||||
* read : Return a string indicating the status of the target.
|
||||
* An IO state string is of the form {io,mem,io+mem,none},
|
||||
* mc and ic are respectively mem and io lock counts (for
|
||||
* debugging/diagnostic only). "decodes" indicate what the
|
||||
* card currently decodes, "owns" indicates what is currently
|
||||
@ -1011,7 +1024,7 @@ EXPORT_SYMBOL(vga_client_register);
|
||||
* write : write a command to the arbiter. List of commands is:
|
||||
*
|
||||
* target <card_ID> : switch target to card <card_ID> (see below)
|
||||
* lock <io_state> : acquires locks on target ("none" is invalid io_state)
|
||||
* lock <io_state> : acquire locks on target ("none" is invalid io_state)
|
||||
* trylock <io_state> : non-blocking acquire locks on target
|
||||
* unlock <io_state> : release locks on target
|
||||
* unlock all : release all locks on target held by this user
|
||||
@ -1028,23 +1041,21 @@ EXPORT_SYMBOL(vga_client_register);
|
||||
* Note about locks:
|
||||
*
|
||||
* The driver keeps track of which user has what locks on which card. It
|
||||
* supports stacking, like the kernel one. This complexifies the implementation
|
||||
* supports stacking, like the kernel one. This complicates the implementation
|
||||
* a bit, but makes the arbiter more tolerant to userspace problems and able
|
||||
* to properly cleanup in all cases when a process dies.
|
||||
* Currently, a max of 16 cards simultaneously can have locks issued from
|
||||
* userspace for a given user (file descriptor instance) of the arbiter.
|
||||
*
|
||||
* If the device is hot-unplugged, there is a hook inside the module to notify
|
||||
* they being added/removed in the system and automatically added/removed in
|
||||
* it being added/removed in the system and automatically added/removed in
|
||||
* the arbiter.
|
||||
*/
|
||||
|
||||
#define MAX_USER_CARDS CONFIG_VGA_ARB_MAX_GPUS
|
||||
#define PCI_INVALID_CARD ((struct pci_dev *)-1UL)
|
||||
|
||||
/*
|
||||
* Each user has an array of these, tracking which cards have locks
|
||||
*/
|
||||
/* Each user has an array of these, tracking which cards have locks */
|
||||
struct vga_arb_user_card {
|
||||
struct pci_dev *pdev;
|
||||
unsigned int mem_cnt;
|
||||
@ -1063,9 +1074,8 @@ static DEFINE_SPINLOCK(vga_user_lock);
|
||||
|
||||
|
||||
/*
|
||||
* This function gets a string in the format: "PCI:domain:bus:dev.fn" and
|
||||
* returns the respective values. If the string is not in this format,
|
||||
* it returns 0.
|
||||
* Take a string in the format: "PCI:domain:bus:dev.fn" and return the
|
||||
* respective values. If the string is not in this format, return 0.
|
||||
*/
|
||||
static int vga_pci_str_to_vars(char *buf, int count, unsigned int *domain,
|
||||
unsigned int *bus, unsigned int *devfn)
|
||||
@ -1073,7 +1083,6 @@ static int vga_pci_str_to_vars(char *buf, int count, unsigned int *domain,
|
||||
int n;
|
||||
unsigned int slot, func;
|
||||
|
||||
|
||||
n = sscanf(buf, "PCI:%x:%x:%x.%x", domain, bus, &slot, &func);
|
||||
if (n != 4)
|
||||
return 0;
|
||||
@ -1098,7 +1107,7 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf,
|
||||
if (lbuf == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
/* Protects vga_list */
|
||||
/* Protect vga_list */
|
||||
spin_lock_irqsave(&vga_lock, flags);
|
||||
|
||||
/* If we are targeting the default, use it */
|
||||
@ -1112,15 +1121,16 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf,
|
||||
/* Find card vgadev structure */
|
||||
vgadev = vgadev_find(pdev);
|
||||
if (vgadev == NULL) {
|
||||
/* Wow, it's not in the list, that shouldn't happen,
|
||||
* let's fix us up and return invalid card
|
||||
/*
|
||||
* Wow, it's not in the list, that shouldn't happen, let's
|
||||
* fix us up and return invalid card.
|
||||
*/
|
||||
spin_unlock_irqrestore(&vga_lock, flags);
|
||||
len = sprintf(lbuf, "invalid");
|
||||
goto done;
|
||||
}
|
||||
|
||||
/* Fill the buffer with infos */
|
||||
/* Fill the buffer with info */
|
||||
len = snprintf(lbuf, 1024,
|
||||
"count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%u:%u)\n",
|
||||
vga_decode_count, pci_name(pdev),
|
||||
@ -1166,7 +1176,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user *buf,
|
||||
if (copy_from_user(kbuf, buf, count))
|
||||
return -EFAULT;
|
||||
curr_pos = kbuf;
|
||||
kbuf[count] = '\0'; /* Just to make sure... */
|
||||
kbuf[count] = '\0';
|
||||
|
||||
if (strncmp(curr_pos, "lock ", 5) == 0) {
|
||||
curr_pos += 5;
|
||||
@ -1191,7 +1201,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user *buf,
|
||||
|
||||
vga_get_uninterruptible(pdev, io_state);
|
||||
|
||||
/* Update the client's locks lists... */
|
||||
/* Update the client's locks lists */
|
||||
for (i = 0; i < MAX_USER_CARDS; i++) {
|
||||
if (priv->cards[i].pdev == pdev) {
|
||||
if (io_state & VGA_RSRC_LEGACY_IO)
|
||||
@ -1308,7 +1318,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user *buf,
|
||||
curr_pos += 7;
|
||||
remaining -= 7;
|
||||
pr_debug("client 0x%p called 'target'\n", priv);
|
||||
/* if target is default */
|
||||
/* If target is default */
|
||||
if (!strncmp(curr_pos, "default", 7))
|
||||
pdev = pci_dev_get(vga_default_device());
|
||||
else {
|
||||
@ -1358,7 +1368,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user *buf,
|
||||
vgaarb_dbg(&pdev->dev, "maximum user cards (%d) number reached, ignoring this one!\n",
|
||||
MAX_USER_CARDS);
|
||||
pci_dev_put(pdev);
|
||||
/* XXX: which value to return? */
|
||||
/* XXX: Which value to return? */
|
||||
ret_val = -ENOMEM;
|
||||
goto done;
|
||||
}
|
||||
@ -1419,13 +1429,12 @@ static int vga_arb_open(struct inode *inode, struct file *file)
|
||||
list_add(&priv->list, &vga_user_list);
|
||||
spin_unlock_irqrestore(&vga_user_lock, flags);
|
||||
|
||||
/* Set the client' lists of locks */
|
||||
/* Set the client's lists of locks */
|
||||
priv->target = vga_default_device(); /* Maybe this is still null! */
|
||||
priv->cards[0].pdev = priv->target;
|
||||
priv->cards[0].io_cnt = 0;
|
||||
priv->cards[0].mem_cnt = 0;
|
||||
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1459,8 +1468,8 @@ static int vga_arb_release(struct inode *inode, struct file *file)
|
||||
}
|
||||
|
||||
/*
|
||||
* callback any registered clients to let them know we have a
|
||||
* change in VGA cards
|
||||
* Callback any registered clients to let them know we have a change in VGA
|
||||
* cards.
|
||||
*/
|
||||
static void vga_arbiter_notify_clients(void)
|
||||
{
|
||||
@ -1494,9 +1503,11 @@ static int pci_notify(struct notifier_block *nb, unsigned long action,
|
||||
|
||||
vgaarb_dbg(dev, "%s\n", __func__);
|
||||
|
||||
/* For now we're only intereted in devices added and removed. I didn't
|
||||
* test this thing here, so someone needs to double check for the
|
||||
* cases of hotplugable vga cards. */
|
||||
/*
|
||||
* For now, we're only interested in devices added and removed.
|
||||
* I didn't test this thing here, so someone needs to double check
|
||||
* for the cases of hot-pluggable VGA cards.
|
||||
*/
|
||||
if (action == BUS_NOTIFY_ADD_DEVICE)
|
||||
notify = vga_arbiter_add_pci_device(pdev);
|
||||
else if (action == BUS_NOTIFY_DEL_DEVICE)
|
||||
@ -1535,8 +1546,7 @@ static int __init vga_arb_device_init(void)
|
||||
|
||||
bus_register_notifier(&pci_bus_type, &pci_notifier);
|
||||
|
||||
/* We add all PCI devices satisfying VGA class in the arbiter by
|
||||
* default */
|
||||
/* Add all VGA class PCI devices by default */
|
||||
pdev = NULL;
|
||||
while ((pdev =
|
||||
pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
|
||||
|
@ -77,7 +77,7 @@ static inline int vga_client_register(struct pci_dev *pdev,
|
||||
static inline int vga_get_interruptible(struct pci_dev *pdev,
|
||||
unsigned int rsrc)
|
||||
{
|
||||
return vga_get(pdev, rsrc, 1);
|
||||
return vga_get(pdev, rsrc, 1);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -92,7 +92,7 @@ static inline int vga_get_interruptible(struct pci_dev *pdev,
|
||||
static inline int vga_get_uninterruptible(struct pci_dev *pdev,
|
||||
unsigned int rsrc)
|
||||
{
|
||||
return vga_get(pdev, rsrc, 0);
|
||||
return vga_get(pdev, rsrc, 0);
|
||||
}
|
||||
|
||||
static inline void vga_client_unregister(struct pci_dev *pdev)
|
||||
|
Loading…
Reference in New Issue
Block a user