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drm/qxl: fix ioport interactions for kernel submitted commands.

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So qxl has ioports, but it really really really doesn't want you
to write to them twice, but if you write and get a signal before
the irq arrives to let you know its completed, you have to think
ahead and avoid writing another time.

However this works fine for update area where really multiple
writes aren't the end of the world, however with create primary
surface, you can't ever do multiple writes. So this stop internal
kernel writes from doing interruptible waits, because otherwise
we have no idea if this write is a new one or a continuation of
a previous one.

virtual hw sucks more than real hw.

This fixes lockups and VM crashes when resizing and starting/stopping
X.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2013-05-14 02:13:24 +01:00
parent 95643359f8
commit a6ac1bc341
1 changed files with 19 additions and 10 deletions
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29
drivers/gpu/drm/qxl/qxl_cmd.c
View file

@ -277,7 +277,7 @@ out_unref:
return 0;
}
static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port)
static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port, bool intr)
{
int irq_num;
long addr = qdev->io_base + port;
@ -285,20 +285,29 @@ static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port)
mutex_lock(&qdev->async_io_mutex);
irq_num = atomic_read(&qdev->irq_received_io_cmd);
if (qdev->last_sent_io_cmd > irq_num) {
ret = wait_event_interruptible(qdev->io_cmd_event,
atomic_read(&qdev->irq_received_io_cmd) > irq_num);
if (ret)
if (intr)
ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
else
ret = wait_event_timeout(qdev->io_cmd_event,
atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
/* 0 is timeout, just bail the "hw" has gone away */
if (ret <= 0)
goto out;
irq_num = atomic_read(&qdev->irq_received_io_cmd);
}
outb(val, addr);
qdev->last_sent_io_cmd = irq_num + 1;
ret = wait_event_interruptible(qdev->io_cmd_event,
atomic_read(&qdev->irq_received_io_cmd) > irq_num);
if (intr)
ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
else
ret = wait_event_timeout(qdev->io_cmd_event,
atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
out:
if (ret > 0)
ret = 0;
mutex_unlock(&qdev->async_io_mutex);
return ret;
}
@ -308,7 +317,7 @@ static void wait_for_io_cmd(struct qxl_device *qdev, uint8_t val, long port)
int ret;
restart:
ret = wait_for_io_cmd_user(qdev, val, port);
ret = wait_for_io_cmd_user(qdev, val, port, false);
if (ret == -ERESTARTSYS)
goto restart;
}
@ -340,7 +349,7 @@ int qxl_io_update_area(struct qxl_device *qdev, struct qxl_bo *surf,
mutex_lock(&qdev->update_area_mutex);
qdev->ram_header->update_area = *area;
qdev->ram_header->update_surface = surface_id;
ret = wait_for_io_cmd_user(qdev, 0, QXL_IO_UPDATE_AREA_ASYNC);
ret = wait_for_io_cmd_user(qdev, 0, QXL_IO_UPDATE_AREA_ASYNC, true);
mutex_unlock(&qdev->update_area_mutex);
return ret;
}