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    Subject[PATCH 1/3] vga: implements VGA arbitration on Linux
    Date
    Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>
    ---
    drivers/gpu/Makefile | 2 +-
    drivers/gpu/vga/Kconfig | 10 +
    drivers/gpu/vga/Makefile | 1 +
    drivers/gpu/vga/vgaarb.c | 1116 ++++++++++++++++++++++++++++++++++++++++++++++
    drivers/video/Kconfig | 2 +
    include/linux/vgaarb.h | 170 +++++++
    6 files changed, 1300 insertions(+), 1 deletions(-)
    create mode 100644 drivers/gpu/vga/Kconfig
    create mode 100644 drivers/gpu/vga/Makefile
    create mode 100644 drivers/gpu/vga/vgaarb.c
    create mode 100644 include/linux/vgaarb.h

    diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile
    index de566cf..30879df 100644
    --- a/drivers/gpu/Makefile
    +++ b/drivers/gpu/Makefile
    @@ -1 +1 @@
    -obj-y += drm/
    +obj-y += drm/ vga/
    diff --git a/drivers/gpu/vga/Kconfig b/drivers/gpu/vga/Kconfig
    new file mode 100644
    index 0000000..790e675
    --- /dev/null
    +++ b/drivers/gpu/vga/Kconfig
    @@ -0,0 +1,10 @@
    +config VGA_ARB
    + bool "VGA Arbitration" if EMBEDDED
    + default y
    + depends on PCI
    + help
    + Some "legacy" VGA devices implemented on PCI typically have the same
    + hard-decoded addresses as they did on ISA. When multiple PCI devices
    + are accessed at same time they need some kind of coordination. Please
    + see Documentation/vgaarbiter.txt for more details. Select this to
    + enable VGA arbiter.
    diff --git a/drivers/gpu/vga/Makefile b/drivers/gpu/vga/Makefile
    new file mode 100644
    index 0000000..7cc8c1e
    --- /dev/null
    +++ b/drivers/gpu/vga/Makefile
    @@ -0,0 +1 @@
    +obj-$(CONFIG_VGA_ARB) += vgaarb.o
    diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
    new file mode 100644
    index 0000000..79d1c36
    --- /dev/null
    +++ b/drivers/gpu/vga/vgaarb.c
    @@ -0,0 +1,1116 @@
    +/*
    + * vgaarb.c
    + *
    + * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
    + * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
    + * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
    + *
    + * Implements the VGA arbitration. For details refer to
    + * Documentation/vgaarbiter.txt
    + */
    +
    +#include <linux/module.h>
    +#include <linux/kernel.h>
    +#include <linux/pci.h>
    +#include <linux/errno.h>
    +#include <linux/init.h>
    +#include <linux/list.h>
    +#include <linux/sched.h>
    +#include <linux/wait.h>
    +#include <linux/spinlock.h>
    +#include <linux/poll.h>
    +#include <linux/miscdevice.h>
    +
    +#include <linux/uaccess.h>
    +
    +#include <linux/vgaarb.h>
    +
    +/*
    + * We keep a list of all vga devices in the system to speed
    + * up the various operations of the arbiter
    + */
    +struct vga_device {
    + struct list_head list;
    + struct pci_dev *pdev;
    + unsigned int decodes; /* what does it decodes */
    + unsigned int owns; /* what does it owns */
    + unsigned int locks; /* what does it locks */
    + unsigned int io_lock_cnt; /* legacy IO lock count */
    + unsigned int mem_lock_cnt; /* legacy MEM lock count */
    + unsigned int io_norm_cnt; /* normal IO count */
    + unsigned int mem_norm_cnt; /* normal MEM count */
    +
    + /* allow IRQ enable/disable hook */
    + void *irq_cookie;
    + void (*irq_set_state)(void *cookie, bool enable);
    +};
    +
    +static LIST_HEAD(vga_list);
    +static DEFINE_SPINLOCK(vga_lock);
    +static DECLARE_WAIT_QUEUE_HEAD(vga_wait_queue);
    +
    +#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
    +/* this is only used a cookie - it should not be dereferenced */
    +static struct pci_dev *vga_default;
    +#endif
    +
    +static void vga_arb_device_card_gone(struct pci_dev *pdev);
    +
    +/* Find somebody in our list */
    +static struct vga_device *vgadev_find(struct pci_dev *pdev)
    +{
    + struct vga_device *vgadev;
    +
    + list_for_each_entry(vgadev, &vga_list, list)
    + if (pdev == vgadev->pdev)
    + return vgadev;
    + return NULL;
    +}
    +
    +/* Returns the default VGA device (vgacon's babe) */
    +#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
    +struct pci_dev *vga_default_device(void)
    +{
    + return vga_default;
    +}
    +#endif
    +
    +static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
    +{
    + if (vgadev->irq_set_state)
    + vgadev->irq_set_state(vgadev->irq_cookie, state);
    +}
    +/* Architecture can override enabling/disabling of a given
    + * device resources here
    + *
    + * TODO: <benh> you can try to be "smart" and if for example you have 2 cards
    + * that are behind separate bridges, you need only swapping the bridge controls
    + * and you can keep the card master IO and memory enable.
    + */
    +#ifndef __ARCH_HAS_VGA_DISABLE_RESOURCES
    +static inline void vga_disable_resources(struct pci_dev *pdev,
    + unsigned int rsrc,
    + unsigned int change_bridge)
    +{
    + struct pci_bus *bus;
    + struct pci_dev *bridge;
    + u16 cmd;
    +
    + pr_devel("%s\n", __func__);
    +
    + pci_read_config_word(pdev, PCI_COMMAND, &cmd);
    + if (rsrc & (VGA_RSRC_LEGACY_IO | VGA_RSRC_NORMAL_IO))
    + cmd &= ~PCI_COMMAND_IO;
    + if (rsrc & (VGA_RSRC_LEGACY_MEM | VGA_RSRC_NORMAL_MEM))
    + cmd &= ~PCI_COMMAND_MEMORY;
    + pci_write_config_word(pdev, PCI_COMMAND, cmd);
    +
    + if (!change_bridge)
    + return;
    +
    + bus = pdev->bus;
    + while (bus) {
    + bridge = bus->self;
    + if (bridge) {
    + pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
    + &cmd);
    + if (cmd & PCI_BRIDGE_CTL_VGA) {
    + cmd &= ~PCI_BRIDGE_CTL_VGA;
    + pci_write_config_word(bridge,
    + PCI_BRIDGE_CONTROL,
    + cmd);
    + }
    + }
    + bus = bus->parent;
    + }
    +}
    +#endif
    +
    +#ifndef __ARCH_HAS_VGA_ENABLE_RESOURCES
    +static inline void vga_enable_resources(struct pci_dev *pdev,
    + unsigned int rsrc)
    +{
    + struct pci_bus *bus;
    + struct pci_dev *bridge;
    + u16 cmd;
    +
    + pr_devel("%s\n", __func__);
    +
    + pci_read_config_word(pdev, PCI_COMMAND, &cmd);
    + if (rsrc & (VGA_RSRC_LEGACY_IO | VGA_RSRC_NORMAL_IO))
    + cmd |= PCI_COMMAND_IO;
    + if (rsrc & (VGA_RSRC_LEGACY_MEM | VGA_RSRC_NORMAL_MEM))
    + cmd |= PCI_COMMAND_MEMORY;
    + pci_write_config_word(pdev, PCI_COMMAND, cmd);
    +
    + if (!(rsrc & VGA_RSRC_LEGACY_MASK))
    + return;
    +
    + bus = pdev->bus;
    + while (bus) {
    + bridge = bus->self;
    + if (bridge) {
    + pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
    + &cmd);
    + if (!(cmd & PCI_BRIDGE_CTL_VGA)) {
    + cmd |= PCI_BRIDGE_CTL_VGA;
    + pci_write_config_word(bridge,
    + PCI_BRIDGE_CONTROL,
    + cmd);
    + }
    + }
    + bus = bus->parent;
    + }
    +}
    +#endif
    +
    +static struct vga_device *__vga_tryget(struct vga_device *vgadev,
    + unsigned int rsrc)
    +{
    + unsigned int wants, legacy_wants, match;
    + struct vga_device *conflict;
    +
    + /* Account for "normal" resources to lock. If we decode the legacy,
    + * counterpart, we need to request it as well
    + */
    + if ((rsrc & VGA_RSRC_NORMAL_IO) &&
    + (vgadev->decodes & VGA_RSRC_LEGACY_IO))
    + rsrc |= VGA_RSRC_LEGACY_IO;
    + if ((rsrc & VGA_RSRC_NORMAL_MEM) &&
    + (vgadev->decodes & VGA_RSRC_LEGACY_MEM))
    + rsrc |= VGA_RSRC_LEGACY_MEM;
    +
    + pr_devel("%s: %d\n", __func__, rsrc);
    + pr_devel("%s: owns: %d\n", __func__, vgadev->owns);
    +
    + /* Check what resources we need to acquire */
    + wants = rsrc & ~vgadev->owns;
    +
    + /* We already own everything, just mark locked & bye bye */
    + if (wants == 0)
    + goto lock_them;
    +
    + /* We don't need to request a legacy resource, we just enable
    + * appropriate decoding and go
    + */
    + legacy_wants = wants & VGA_RSRC_LEGACY_MASK;
    + if (legacy_wants == 0)
    + goto enable_them;
    +
    + /* Ok, we don't, let's find out how we need to kick off */
    + list_for_each_entry(conflict, &vga_list, list) {
    + unsigned int lwants = legacy_wants;
    + unsigned int change_bridge = 0;
    +
    + /* Don't conflict with myself */
    + if (vgadev == conflict)
    + continue;
    +
    + /* Check if the architecture allows a conflict between those
    + * 2 devices or if they are on separate domains
    + */
    + if (!vga_conflicts(vgadev->pdev, conflict->pdev))
    + continue;
    +
    + /* We have a possible conflict. before we go further, we must
    + * check if we sit on the same bus as the conflicting device.
    + * if we don't, then we must tie both IO and MEM resources
    + * together since there is only a single bit controlling
    + * VGA forwarding on P2P bridges
    + */
    + if (vgadev->pdev->bus != conflict->pdev->bus) {
    + change_bridge = 1;
    + lwants = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
    + }
    +
    + /* Check if the guy has a lock on the resource. If he does,
    + * return the conflicting entry
    + */
    + if (conflict->locks & lwants)
    + return conflict;
    +
    + /* Ok, now check if he owns the resource we want. We don't need
    + * to check "decodes" since it should be impossible to own
    + * own legacy resources you don't decode unless I have a bug
    + * in this code...
    + */
    + WARN_ON(conflict->owns & ~conflict->decodes);
    + match = lwants & conflict->owns;
    + if (!match)
    + continue;
    +
    + /* looks like he doesn't have a lock, we can steal
    + * them from him
    + */
    + vga_irq_set_state(conflict, false);
    + vga_disable_resources(conflict->pdev, lwants,
    + change_bridge);
    + conflict->owns &= ~lwants;
    + /* If he also owned non-legacy, that is no longer the case */
    + if (lwants & VGA_RSRC_LEGACY_MEM)
    + conflict->owns &= ~VGA_RSRC_NORMAL_MEM;
    + if (lwants & VGA_RSRC_LEGACY_IO)
    + conflict->owns &= ~VGA_RSRC_NORMAL_IO;
    + }
    +
    +enable_them:
    + /* ok dude, we got it, everybody conflicting has been disabled, let's
    + * enable us. Make sure we don't mark a bit in "owns" that we don't
    + * also have in "decodes". We can lock resources we don't decode but
    + * not own them.
    + */
    + vga_enable_resources(vgadev->pdev, wants);
    + vga_irq_set_state(vgadev, true);
    + vgadev->owns |= (wants & vgadev->decodes);
    +lock_them:
    + vgadev->locks |= (rsrc & VGA_RSRC_LEGACY_MASK);
    + if (rsrc & VGA_RSRC_LEGACY_IO)
    + vgadev->io_lock_cnt++;
    + if (rsrc & VGA_RSRC_LEGACY_MEM)
    + vgadev->mem_lock_cnt++;
    + if (rsrc & VGA_RSRC_NORMAL_IO)
    + vgadev->io_norm_cnt++;
    + if (rsrc & VGA_RSRC_NORMAL_MEM)
    + vgadev->mem_norm_cnt++;
    +
    + return NULL;
    +}
    +
    +static void __vga_put(struct vga_device *vgadev, unsigned int rsrc)
    +{
    + unsigned int old_locks = vgadev->locks;
    +
    + pr_devel("%s\n", __func__);
    +
    + /* Update our counters, and account for equivalent legacy resources
    + * if we decode them
    + */
    + if ((rsrc & VGA_RSRC_NORMAL_IO) && vgadev->io_norm_cnt > 0) {
    + vgadev->io_norm_cnt--;
    + if (vgadev->decodes & VGA_RSRC_LEGACY_IO)
    + rsrc |= VGA_RSRC_LEGACY_IO;
    + }
    + if ((rsrc & VGA_RSRC_NORMAL_MEM) && vgadev->mem_norm_cnt > 0) {
    + vgadev->mem_norm_cnt--;
    + if (vgadev->decodes & VGA_RSRC_LEGACY_MEM)
    + rsrc |= VGA_RSRC_LEGACY_MEM;
    + }
    + if ((rsrc & VGA_RSRC_LEGACY_IO) && vgadev->io_lock_cnt > 0)
    + vgadev->io_lock_cnt--;
    + if ((rsrc & VGA_RSRC_LEGACY_MEM) && vgadev->mem_lock_cnt > 0)
    + vgadev->mem_lock_cnt--;
    +
    + /* Just clear lock bits, we do lazy operations so we don't really
    + * have to bother about anything else at this point
    + */
    + if (vgadev->io_lock_cnt == 0)
    + vgadev->locks &= ~VGA_RSRC_LEGACY_IO;
    + if (vgadev->mem_lock_cnt == 0)
    + vgadev->locks &= ~VGA_RSRC_LEGACY_MEM;
    +
    + /* Kick the wait queue in case somebody was waiting if we actually
    + * released something
    + */
    + if (old_locks != vgadev->locks)
    + wake_up_all(&vga_wait_queue);
    +}
    +
    +int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
    +{
    + struct vga_device *vgadev, *conflict;
    + unsigned long flags;
    + wait_queue_t wait;
    + int rc = 0;
    +
    + /* The one who calls us should check for this, but lets be sure... */
    + if (pdev == NULL)
    + pdev = vga_default_device();
    + if (pdev == NULL)
    + return 0;
    +
    + for (;;) {
    + spin_lock_irqsave(&vga_lock, flags);
    + vgadev = vgadev_find(pdev);
    + if (vgadev == NULL) {
    + spin_unlock_irqrestore(&vga_lock, flags);
    + rc = -ENODEV;
    + break;
    + }
    + conflict = __vga_tryget(vgadev, rsrc);
    + spin_unlock_irqrestore(&vga_lock, flags);
    + if (conflict == NULL)
    + break;
    +
    +
    + /* We have a conflict, we wait until somebody kicks the
    + * work queue. Currently we have one work queue that we
    + * kick each time some resources are released, but it would
    + * be fairly easy to have a per device one so that we only
    + * need to attach to the conflicting device
    + */
    + init_waitqueue_entry(&wait, current);
    + add_wait_queue(&vga_wait_queue, &wait);
    + set_current_state(interruptible ?
    + TASK_INTERRUPTIBLE :
    + TASK_UNINTERRUPTIBLE);
    + if (signal_pending(current)) {
    + rc = -EINTR;
    + break;
    + }
    + schedule();
    + remove_wait_queue(&vga_wait_queue, &wait);
    + set_current_state(TASK_RUNNING);
    + }
    + return rc;
    +}
    +
    +int vga_tryget(struct pci_dev *pdev, unsigned int rsrc)
    +{
    + struct vga_device *vgadev;
    + unsigned long flags;
    + int rc = 0;
    +
    + /* The one who calls us should check for this, but lets be sure... */
    + if (pdev == NULL)
    + pdev = vga_default_device();
    + if (pdev == NULL)
    + return 0;
    + spin_lock_irqsave(&vga_lock, flags);
    + vgadev = vgadev_find(pdev);
    + if (vgadev == NULL) {
    + rc = -ENODEV;
    + goto bail;
    + }
    + if (__vga_tryget(vgadev, rsrc))
    + rc = -EBUSY;
    +bail:
    + spin_unlock_irqrestore(&vga_lock, flags);
    + return rc;
    +}
    +
    +void vga_put(struct pci_dev *pdev, unsigned int rsrc)
    +{
    + struct vga_device *vgadev;
    + unsigned long flags;
    +
    + /* The one who calls us should check for this, but lets be sure... */
    + if (pdev == NULL)
    + pdev = vga_default_device();
    + if (pdev == NULL)
    + return;
    + spin_lock_irqsave(&vga_lock, flags);
    + vgadev = vgadev_find(pdev);
    + if (vgadev == NULL)
    + goto bail;
    + __vga_put(vgadev, rsrc);
    +bail:
    + spin_unlock_irqrestore(&vga_lock, flags);
    +}
    +
    +/*
    + * 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.
    + */
    +static void vga_arbiter_add_pci_device(struct pci_dev *pdev)
    +{
    + struct vga_device *vgadev;
    + unsigned long flags;
    + struct pci_bus *bus;
    + struct pci_dev *bridge;
    + u16 cmd;
    +
    + /* Only deal with VGA class devices */
    + if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
    + return;
    +
    + /* Allocate structure */
    + vgadev = kmalloc(sizeof(struct vga_device), GFP_KERNEL);
    + if (vgadev == NULL) {
    + pr_err("vgaarb: failed to allocate pci device\n");
    + /* 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;
    + }
    +
    + memset(vgadev, 0, sizeof(*vgadev));
    +
    + /* Take lock & check for duplicates */
    + spin_lock_irqsave(&vga_lock, flags);
    + if (vgadev_find(pdev) != NULL) {
    + BUG_ON(1);
    + goto fail;
    + }
    + vgadev->pdev = pdev;
    +
    + /* By default, assume we decode everything */
    + vgadev->decodes = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
    + VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
    +
    + /* 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)
    + vgadev->owns |= VGA_RSRC_LEGACY_IO;
    + if (cmd & PCI_COMMAND_MEMORY)
    + vgadev->owns |= VGA_RSRC_LEGACY_MEM;
    +
    + /* Check if VGA cycles can get down to us */
    + bus = pdev->bus;
    + while (bus) {
    + bridge = bus->self;
    + if (bridge) {
    + u16 l;
    + pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
    + &l);
    + if (!(l & PCI_BRIDGE_CTL_VGA)) {
    + vgadev->owns = 0;
    + break;
    + }
    + }
    + bus = bus->parent;
    + }
    +
    + /* Deal with VGA default device. Use first enabled one
    + * by default if arch doesn't have it's own hook
    + */
    +#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
    + if (vga_default == NULL && (vgadev->owns & VGA_RSRC_LEGACY_MEM) &&
    + (vgadev->owns & VGA_RSRC_LEGACY_IO))
    + vga_default = pdev;
    +
    +#endif
    +
    + /* Add to the list */
    + list_add(&vgadev->list, &vga_list);
    + pr_info("vgaarb: device added: %d %d %d\n",
    + pdev->device, pdev->vendor, pdev->devfn);
    + spin_unlock_irqrestore(&vga_lock, flags);
    + return;
    +fail:
    + spin_unlock_irqrestore(&vga_lock, flags);
    + kfree(vgadev);
    +}
    +
    +static void vga_arbiter_del_pci_device(struct pci_dev *pdev)
    +{
    + struct vga_device *vgadev;
    + unsigned long flags;
    +
    + spin_lock_irqsave(&vga_lock, flags);
    + vgadev = vgadev_find(pdev);
    + if (vgadev == NULL)
    + goto bail;
    +
    + if (vga_default == pdev)
    + vga_default = NULL;
    +
    + /* Remove entry from list */
    + list_del(&vgadev->list);
    +
    + /* Notify userland driver that the device is gone so it discards
    + * it's copies of the pci_dev pointer
    + */
    + vga_arb_device_card_gone(pdev);
    +
    + /* Wake up all possible waiters */
    + wake_up_all(&vga_wait_queue);
    +bail:
    + spin_unlock_irqrestore(&vga_lock, flags);
    + kfree(vgadev);
    +}
    +
    +void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes)
    +{
    + struct vga_device *vgadev;
    + unsigned long flags;
    +
    + decodes &= VGA_RSRC_LEGACY_MASK;
    +
    + spin_lock_irqsave(&vga_lock, flags);
    + vgadev = vgadev_find(pdev);
    + if (vgadev == NULL)
    + goto bail;
    +
    + vgadev->decodes = decodes;
    + vgadev->owns &= 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 ...
    + */
    +bail:
    + spin_unlock_irqrestore(&vga_lock, flags);
    +}
    +EXPORT_SYMBOL(vga_set_legacy_decoding);
    +
    +void vga_set_irq_callback(struct pci_dev *pdev, void *cookie, void (*irq_func)(void *cookie, bool enable))
    +{
    + struct vga_device *vgadev;
    + unsigned long flags;
    +
    + spin_lock_irqsave(&vga_lock, flags);
    + vgadev = vgadev_find(pdev);
    + if (!vgadev)
    + goto bail;
    +
    + vgadev->irq_cookie = cookie;
    + vgadev->irq_set_state = irq_func;
    +bail:
    + spin_unlock_irqrestore(&vga_lock, flags);
    +
    +}
    +EXPORT_SYMBOL(vga_set_irq_callback);
    +
    +/*
    + * Char driver implementation
    + *
    + * Semantics is:
    + *
    + * open : open user instance of the arbitrer. by default, it's
    + * attached to the default VGA device of the system.
    + *
    + * 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},
    + * 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
    + * enabled on it, and "locks" indicates what is locked by this
    + * card. If the card is unplugged, we get "invalid" then for
    + * card_ID and an -ENODEV error is returned for any command
    + * until a new card is targeted
    + *
    + * "<card_ID>,decodes=<io_state>,owns=<io_state>,locks=<io_state> (ic,mc)"
    + *
    + * 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)
    + * 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
    + * decodes <io_state> : set the legacy decoding attributes for the card
    + *
    + * poll : event if something change on any card (not just the target)
    + *
    + * card_ID is of the form "PCI:domain:bus:dev.fn". It can be set to "default"
    + * to go back to the system default card (TODO: not implemented yet).
    + * Currently, only PCI is supported as a prefix, but the userland API may
    + * support other bus types in the future, even if the current kernel
    + * implementation doesn't.
    + *
    + * 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
    + * 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
    + * the arbiter.
    + */
    +
    +#define MAX_USER_CARDS 16
    +#define PCI_INVALID_CARD ((struct pci_dev *)-1UL)
    +
    +/*
    + * 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;
    + unsigned int io_cnt;
    +};
    +
    +struct vga_arb_private {
    + struct list_head list;
    + struct pci_dev *target;
    + struct vga_arb_user_card cards[MAX_USER_CARDS];
    + spinlock_t lock;
    +};
    +
    +static LIST_HEAD(vga_user_list);
    +static DEFINE_SPINLOCK(vga_user_lock);
    +
    +static const char *vga_iostate_to_str(unsigned int iostate)
    +{
    + /* Ignore VGA_RSRC_IO and VGA_RSRC_MEM */
    + iostate &= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
    + switch (iostate) {
    + case VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM:
    + return "io+mem";
    + case VGA_RSRC_LEGACY_IO:
    + return "io";
    + case VGA_RSRC_LEGACY_MEM:
    + return "mem";
    + }
    + return "none";
    +}
    +
    +static int vga_str_to_iostate(char *buf, int str_size, int *io_state)
    +{
    + /* XXX We're not chekcing the str_size! */
    + if (strncmp(buf, "io+mem", 6) == 0)
    + *io_state = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
    + else if (strncmp(buf, "io", 2) == 0)
    + *io_state = VGA_RSRC_LEGACY_IO;
    + else if (strncmp(buf, "mem", 3) == 0)
    + *io_state = VGA_RSRC_LEGACY_MEM;
    + else if (strncmp(buf, "none", 4) == 0)
    + *io_state = VGA_RSRC_NONE;
    + else
    + return 0;
    + return 1;
    +}
    +
    +/*
    + * 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.
    + */
    +static int vga_pci_str_to_vars(char *buf, int count, unsigned int *domain,
    + unsigned int *bus, unsigned int *devfn)
    +{
    + int n;
    + unsigned int slot, func;
    +
    + n = sscanf(buf, "PCI:%d:%d:%d.%d", domain, bus, &slot, &func);
    + if (n != 4)
    + return 0;
    +
    + *devfn = PCI_DEVFN(slot, func);
    +
    + return 1;
    +}
    +
    +static ssize_t vga_arb_read(struct file *file, char __user * buf,
    + size_t count, loff_t *ppos)
    +{
    + struct vga_arb_private *priv = file->private_data;
    + struct vga_device *vgadev;
    + struct pci_dev *pdev;
    + unsigned long flags;
    + size_t len;
    + int rc;
    + char *lbuf;
    +
    + lbuf = kmalloc(1024, GFP_KERNEL);
    + if (lbuf == NULL)
    + return -ENOMEM;
    +
    + /* Shields against vga_arb_device_card_gone (pci_dev going
    + * away), and allows access to vga list
    + */
    + spin_lock_irqsave(&vga_lock, flags);
    +
    + /* If we are targetting the default, use it */
    + pdev = priv->target;
    + if (pdev == NULL || pdev == PCI_INVALID_CARD) {
    + spin_unlock_irqrestore(&vga_lock, flags);
    + len = sprintf(lbuf, "invalid");
    + goto done;
    + }
    +
    + /* 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
    + */
    + if (pdev == priv->target)
    + vga_arb_device_card_gone(pdev);
    + spin_unlock_irqrestore(&vga_lock, flags);
    + len = sprintf(lbuf, "invalid");
    + goto done;
    + }
    +
    + /* Fill the buffer with infos */
    + len = snprintf(lbuf, 1024,
    + "PCI:%s,decodes=%s,owns=%s,locks=%s (%d,%d)\n",
    + pci_name(pdev),
    + vga_iostate_to_str(vgadev->decodes),
    + vga_iostate_to_str(vgadev->owns),
    + vga_iostate_to_str(vgadev->locks),
    + vgadev->io_lock_cnt, vgadev->mem_lock_cnt);
    +
    + spin_unlock_irqrestore(&vga_lock, flags);
    +done:
    +
    + /* Copy that to user */
    + if (len > count)
    + len = count;
    + rc = copy_to_user(buf, lbuf, len);
    + kfree(lbuf);
    + if (rc)
    + return -EFAULT;
    + return len;
    +}
    +
    +/*
    + * TODO: To avoid parsing inside kernel and to improve the speed we may
    + * consider use ioctl here
    + */
    +static ssize_t vga_arb_write(struct file *file, const char __user * buf,
    + size_t count, loff_t *ppos)
    +{
    + struct vga_arb_private *priv = file->private_data;
    + struct pci_dev *pdev;
    +
    + unsigned int io_state;
    +
    + char *kbuf, *curr_pos;
    + size_t remaining = count;
    +
    + int ret_val;
    + int i;
    +
    +
    + kbuf = kmalloc(count + 1, GFP_KERNEL);
    + if (!kbuf)
    + return -ENOMEM;
    +
    + if (copy_from_user(kbuf, buf, count)) {
    + kfree(kbuf);
    + return -EFAULT;
    + }
    + curr_pos = kbuf;
    + kbuf[count] = '\0'; /* Just to make sure... */
    +
    + if (strncmp(curr_pos, "lock ", 5) == 0) {
    + curr_pos += 5;
    + remaining -= 5;
    +
    + pr_devel("client 0x%X called 'lock'\n", (int)priv);
    +
    + if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    + if (io_state == VGA_RSRC_NONE) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    +
    + pdev = priv->target;
    + if (priv->target == NULL) {
    + ret_val = -ENODEV;
    + goto done;
    + }
    +
    + vga_get_uninterruptible(pdev, io_state);
    +
    + /* 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)
    + priv->cards[i].io_cnt++;
    + if (io_state & VGA_RSRC_LEGACY_MEM)
    + priv->cards[i].mem_cnt++;
    + break;
    + }
    + }
    +
    + ret_val = count;
    + goto done;
    + } else if (strncmp(curr_pos, "unlock ", 7) == 0) {
    + curr_pos += 7;
    + remaining -= 7;
    +
    + pr_devel("client 0x%X called 'unlock'\n", (int)priv);
    +
    + if (strncmp(curr_pos, "all", 3) == 0)
    + io_state = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
    + else {
    + if (!vga_str_to_iostate
    + (curr_pos, remaining, &io_state)) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    + /* TODO: Add this?
    + if (io_state == VGA_RSRC_NONE) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    + */
    + }
    +
    + pdev = priv->target;
    + if (priv->target == NULL) {
    + ret_val = -ENODEV;
    + goto done;
    + }
    +
    + vga_put(pdev, io_state);
    + for (i = 0; i < MAX_USER_CARDS; i++) {
    + if (priv->cards[i].pdev == pdev) {
    + if (io_state & VGA_RSRC_LEGACY_IO)
    + priv->cards[i].io_cnt--;
    + if (io_state & VGA_RSRC_LEGACY_MEM)
    + priv->cards[i].mem_cnt--;
    + break;
    + }
    + }
    +
    + ret_val = count;
    + goto done;
    + } else if (strncmp(curr_pos, "trylock ", 8) == 0) {
    + curr_pos += 8;
    + remaining -= 8;
    +
    + pr_devel("client 0x%X called 'trylock'\n", (int)priv);
    +
    + if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    + /* TODO: Add this?
    + if (io_state == VGA_RSRC_NONE) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    + */
    +
    + pdev = priv->target;
    + if (priv->target == NULL) {
    + ret_val = -ENODEV;
    + goto done;
    + }
    +
    + if (vga_tryget(pdev, io_state)) {
    + /* 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)
    + priv->cards[i].io_cnt++;
    + if (io_state & VGA_RSRC_LEGACY_MEM)
    + priv->cards[i].mem_cnt++;
    + break;
    + }
    + }
    + ret_val = count;
    + goto done;
    + } else {
    + ret_val = -EBUSY;
    + goto done;
    + }
    +
    + } else if (strncmp(curr_pos, "target ", 7) == 0) {
    + unsigned int domain, bus, devfn;
    + struct vga_device *vgadev;
    +
    + curr_pos += 7;
    + remaining -= 7;
    + pr_devel("client 0x%X called 'target'\n", (int)priv);
    + if (!vga_pci_str_to_vars(curr_pos, remaining,
    + &domain, &bus, &devfn)) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    +
    + pdev = pci_get_bus_and_slot(bus, devfn);
    + if (!pdev) {
    + pr_info("invalid PCI address\n");
    + ret_val = -ENODEV;
    + goto done;
    + }
    +
    + vgadev = vgadev_find(pdev);
    + if (vgadev == NULL) {
    + pr_info("this PCI is not a vga device\n");
    + ret_val = -ENODEV;
    + goto done;
    + }
    +
    + priv->target = pdev;
    + for (i = 0; i < MAX_USER_CARDS; i++) {
    + if (priv->cards[i].pdev == pdev)
    + break;
    + if (priv->cards[i].pdev == NULL) {
    + priv->cards[i].pdev = pdev;
    + priv->cards[i].io_cnt = 0;
    + priv->cards[i].mem_cnt = 0;
    + break;
    + }
    + }
    + if (i == MAX_USER_CARDS) {
    + pr_err("maximum user cards number reached!\n");
    + /* XXX: which value to return? */
    + ret_val = -ENOMEM;
    + goto done;
    + }
    +
    + ret_val = count;
    + goto done;
    +
    +
    + } else if (strncmp(curr_pos, "decodes ", 8) == 0) {
    + curr_pos += 8;
    + remaining -= 8;
    + pr_devel("client 0x%X called 'decodes'\n", (int)priv);
    +
    + if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) {
    + ret_val = -EPROTO;
    + goto done;
    + }
    + pdev = priv->target;
    + if (priv->target == NULL) {
    + ret_val = -ENODEV;
    + goto done;
    + }
    +
    + vga_set_legacy_decoding(pdev, io_state);
    + ret_val = count;
    + goto done;
    + }
    + /* If we got here, the message written is not part of the protocol! */
    + kfree(kbuf);
    + return -EPROTO;
    +
    +done:
    + kfree(kbuf);
    + return ret_val;
    +}
    +
    +static unsigned int vga_arb_fpoll(struct file *file, poll_table * wait)
    +{
    + struct vga_arb_private *priv = file->private_data;
    +
    + pr_devel("%s\n", __func__);
    +
    + if (priv == NULL)
    + return -ENODEV;
    + poll_wait(file, &vga_wait_queue, wait);
    + return POLLIN;
    +}
    +
    +static int vga_arb_open(struct inode *inode, struct file *file)
    +{
    + struct vga_arb_private *priv;
    + unsigned long flags;
    +
    + pr_devel("%s\n", __func__);
    +
    + priv = kmalloc(sizeof(struct vga_arb_private), GFP_KERNEL);
    + if (priv == NULL)
    + return -ENOMEM;
    + memset(priv, 0, sizeof(*priv));
    + spin_lock_init(&priv->lock);
    + file->private_data = priv;
    +
    + spin_lock_irqsave(&vga_user_lock, flags);
    + list_add(&priv->list, &vga_user_list);
    + spin_unlock_irqrestore(&vga_user_lock, flags);
    +
    + /* Set the client' 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;
    +}
    +
    +static int vga_arb_release(struct inode *inode, struct file *file)
    +{
    + struct vga_arb_private *priv = file->private_data;
    + struct vga_arb_user_card *uc;
    + unsigned long flags;
    + int i;
    +
    + pr_devel("%s\n", __func__);
    +
    + if (priv == NULL)
    + return -ENODEV;
    +
    + spin_lock_irqsave(&vga_user_lock, flags);
    + list_del(&priv->list);
    + for (i = 0; i < MAX_USER_CARDS; i++) {
    + uc = &priv->cards[i];
    + if (uc->pdev == NULL)
    + continue;
    + pr_devel("uc->io_cnt == %d, uc->mem_cnt == %d\n",
    + uc->io_cnt, uc->mem_cnt);
    + while (uc->io_cnt--)
    + vga_put(uc->pdev, VGA_RSRC_LEGACY_IO);
    + while (uc->mem_cnt--)
    + vga_put(uc->pdev, VGA_RSRC_LEGACY_MEM);
    + }
    + spin_unlock_irqrestore(&vga_user_lock, flags);
    +
    + kfree(priv);
    +
    + return 0;
    +}
    +
    +static void vga_arb_device_card_gone(struct pci_dev *pdev)
    +{
    +}
    +
    +static int pci_notify(struct notifier_block *nb, unsigned long action,
    + void *data)
    +{
    + struct device *dev = data;
    + struct pci_dev *pdev = to_pci_dev(dev);
    +
    + pr_devel("%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. */
    + if (action == BUS_NOTIFY_ADD_DEVICE)
    + vga_arbiter_add_pci_device(pdev);
    + else if (action == BUS_NOTIFY_DEL_DEVICE)
    + vga_arbiter_del_pci_device(pdev);
    +
    + return 0;
    +}
    +
    +static struct notifier_block pci_notifier = {
    + .notifier_call = pci_notify,
    +};
    +
    +static const struct file_operations vga_arb_device_fops = {
    + .read = vga_arb_read,
    + .write = vga_arb_write,
    + .poll = vga_arb_fpoll,
    + .open = vga_arb_open,
    + .release = vga_arb_release,
    +};
    +
    +static struct miscdevice vga_arb_device = {
    + MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops
    +};
    +
    +static int __init vga_arb_device_init(void)
    +{
    + int rc;
    + struct pci_dev *pdev;
    +
    + rc = misc_register(&vga_arb_device);
    + if (rc < 0)
    + pr_err("vgaarb: error %d registering device\n", rc);
    +
    + bus_register_notifier(&pci_bus_type, &pci_notifier);
    +
    + /* We add all pci devices satisfying vga class in the arbiter by
    + * default */
    + pdev = NULL;
    + while ((pdev =
    + pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
    + PCI_ANY_ID, pdev)) != NULL)
    + vga_arbiter_add_pci_device(pdev);
    +
    + pr_info("vgaarb: loaded\n");
    + return rc;
    +}
    +subsys_initcall(vga_arb_device_init);
    diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
    index 8afcf08..f4ed145 100644
    --- a/drivers/video/Kconfig
    +++ b/drivers/video/Kconfig
    @@ -7,6 +7,8 @@ menu "Graphics support"

    source "drivers/char/agp/Kconfig"

    +source "drivers/gpu/vga/Kconfig"
    +
    source "drivers/gpu/drm/Kconfig"

    config VGASTATE
    diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
    new file mode 100644
    index 0000000..cdc4ebb
    --- /dev/null
    +++ b/include/linux/vgaarb.h
    @@ -0,0 +1,170 @@
    +/*
    + * vgaarb.c
    + *
    + * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
    + * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
    + * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
    + */
    +
    +#ifndef LINUX_VGA_H
    +
    +#include <asm/vga.h>
    +
    +/* Legacy VGA regions */
    +#define VGA_RSRC_NONE 0x00
    +#define VGA_RSRC_LEGACY_IO 0x01
    +#define VGA_RSRC_LEGACY_MEM 0x02
    +#define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
    +/* Non-legacy access */
    +#define VGA_RSRC_NORMAL_IO 0x04
    +#define VGA_RSRC_NORMAL_MEM 0x08
    +
    +/* Passing that instead of a pci_dev to use the system "default"
    + * device, that is the one used by vgacon. Archs will probably
    + * have to provide their own vga_default_device();
    + */
    +#define VGA_DEFAULT_DEVICE (NULL)
    +
    +/* For use by clients */
    +
    +/**
    + * vga_set_legacy_decoding
    + *
    + * @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 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
    + * interrupts at any time.
    + */
    +extern void vga_set_legacy_decoding(struct pci_dev *pdev,
    + unsigned int decodes);
    +
    +/**
    + * vga_get - acquire & locks VGA resources
    + *
    + * pdev: pci device of the VGA card or NULL for the system default
    + * rsrc: bit mask of resources to acquire and lock
    + * interruptible: blocking should be interruptible by signals ?
    + *
    + * This function acquires VGA resources for the given
    + * card and mark those resources locked. If the resource requested
    + * are "normal" (and not legacy) resources, the arbiter will first check
    + * wether the card is doing legacy decoding for that type of resource. If
    + * yes, the lock is "converted" into a legacy resource lock.
    + * The arbiter will first look for all VGA cards that might conflict
    + * and disable their IOs and/or Memory access, inlcuding VGA forwarding
    + * on P2P bridges if necessary, so that the requested resources can
    + * be used. Then, the card is marked as locking these resources and
    + * the IO and/or Memory accesse are enabled on the card (including
    + * VGA forwarding on parent P2P bridges if any).
    + * This function will block if some conflicting card is already locking
    + * one of the required resources (or any resource on a different bus
    + * segment, since P2P bridges don't differenciate VGA memory and IO
    + * afaik). You can indicate wether this blocking should be interruptible
    + * by a signal (for userland interface) or not.
    + * Must not be called at interrupt time or in atomic context.
    + * If the card already owns the resources, the function succeeds.
    + * Nested calls are supported (a per-resource counter is maintained)
    + */
    +
    +extern int vga_get(struct pci_dev *pdev, unsigned int rsrc,
    + int interruptible);
    +
    +/**
    + * vga_get_interruptible
    + *
    + * Shortcut to vga_get
    + */
    +
    +static inline int vga_get_interruptible(struct pci_dev *pdev,
    + unsigned int rsrc)
    +{
    + return vga_get(pdev, rsrc, 1);
    +}
    +
    +/**
    + * vga_get_interruptible
    + *
    + * Shortcut to vga_get
    + */
    +
    +static inline int vga_get_uninterruptible(struct pci_dev *pdev,
    + unsigned int rsrc)
    +{
    + return vga_get(pdev, rsrc, 0);
    +}
    +
    +/**
    + * vga_tryget - try to acquire & lock legacy VGA resources
    + *
    + * @pdev: pci devivce of VGA card or NULL for system default
    + * @rsrc: bit mask of resources to acquire and lock
    + *
    + * This function performs the same operation as vga_get(), but
    + * will return an error (-EBUSY) instead of blocking if the resources
    + * are already locked by another card. It can be called in any context
    + */
    +
    +extern int vga_tryget(struct pci_dev *pdev, unsigned int rsrc);
    +
    +/**
    + * vga_put - release lock on legacy VGA resources
    + *
    + * @pdev: pci device of VGA card or NULL for system default
    + * @rsrc: but mask of resource to release
    + *
    + * This function releases resources previously locked by vga_get()
    + * or vga_tryget(). The resources aren't disabled right away, so
    + * that a subsequence vga_get() on the same card will succeed
    + * immediately. Resources have a counter, so locks are only
    + * released if the counter reaches 0.
    + */
    +
    +extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);
    +
    +
    +/**
    + * vga_default_device
    + *
    + * This can be defined by the platform. The default implementation
    + * is rather dumb and will probably only work properly on single
    + * vga card setups and/or x86 platforms.
    + *
    + * If your VGA default device is not PCI, you'll have to return
    + * NULL here. In this case, I assume it will not conflict with
    + * any PCI card. If this is not true, I'll have to define two archs
    + * hooks for enabling/disabling the VGA default device if that is
    + * possible. This may be a problem with real _ISA_ VGA cards, in
    + * addition to a PCI one. I don't know at this point how to deal
    + * with that card. Can theirs IOs be disabled at all ? If not, then
    + * I suppose it's a matter of having the proper arch hook telling
    + * us about it, so we basically never allow anybody to succeed a
    + * vga_get()...
    + */
    +
    +#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
    +extern struct pci_dev *vga_default_device(void);
    +#endif
    +
    +/**
    + * vga_conflicts
    + *
    + * Architectures should define this if they have several
    + * independant PCI domains that can afford concurrent VGA
    + * decoding
    + */
    +
    +#ifndef __ARCH_HAS_VGA_CONFLICT
    +static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2)
    +{
    + return 1;
    +}
    +#endif
    +
    +void vga_set_irq_callback(struct pci_dev *pdev, void *cookie, void (*irq_func)(void *cookie, bool enable));
    +
    +#endif /* LINUX_VGA_H */
    --
    1.5.6.3


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