2009-08-11 09:52:06 +04:00
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/*
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2010-05-24 19:24:31 +04:00
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* vgaarb.c: Implements the VGA arbitration. For details refer to
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2018-05-08 21:14:57 +03:00
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* Documentation/gpu/vgaarbiter.rst
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2010-05-24 19:24:31 +04:00
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*
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2009-08-11 09:52:06 +04:00
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*
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* (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
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* (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
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*
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2010-05-24 19:24:31 +04:00
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS
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* IN THE SOFTWARE.
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*
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2009-08-11 09:52:06 +04:00
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*/
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2015-08-12 17:32:06 +03:00
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#define pr_fmt(fmt) "vgaarb: " fmt
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2016-11-17 20:47:58 +03:00
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#define vgaarb_dbg(dev, fmt, arg...) dev_dbg(dev, "vgaarb: " fmt, ##arg)
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#define vgaarb_info(dev, fmt, arg...) dev_info(dev, "vgaarb: " fmt, ##arg)
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#define vgaarb_err(dev, fmt, arg...) dev_err(dev, "vgaarb: " fmt, ##arg)
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2009-08-11 09:52:06 +04:00
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/list.h>
|
2017-02-02 21:15:33 +03:00
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#include <linux/sched/signal.h>
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2009-08-11 09:52:06 +04:00
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#include <linux/wait.h>
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#include <linux/spinlock.h>
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#include <linux/poll.h>
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#include <linux/miscdevice.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
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|
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#include <linux/slab.h>
|
2014-08-25 01:09:53 +04:00
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#include <linux/screen_info.h>
|
2019-03-01 12:24:59 +03:00
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#include <linux/vt.h>
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#include <linux/console.h>
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2009-08-11 09:52:06 +04:00
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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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* 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 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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unsigned int mem_norm_cnt; /* normal MEM count */
|
2010-06-01 09:32:24 +04:00
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|
|
bool bridge_has_one_vga;
|
2009-08-11 09:52:06 +04:00
|
|
|
/* allow IRQ enable/disable hook */
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void *cookie;
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void (*irq_set_state)(void *cookie, bool enable);
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|
unsigned int (*set_vga_decode)(void *cookie, bool decode);
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|
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};
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static LIST_HEAD(vga_list);
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|
|
|
static int vga_count, vga_decode_count;
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|
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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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iostate &= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
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switch (iostate) {
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case VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM:
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return "io+mem";
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case VGA_RSRC_LEGACY_IO:
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|
return "io";
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case VGA_RSRC_LEGACY_MEM:
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|
return "mem";
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}
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return "none";
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}
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static int vga_str_to_iostate(char *buf, int str_size, 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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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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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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goto both;
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else if (strncmp(buf, "mem", 3) == 0)
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goto both;
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return 0;
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both:
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*io_state = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
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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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static struct pci_dev *vga_default;
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static void vga_arb_device_card_gone(struct pci_dev *pdev);
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/* Find somebody in our list */
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static struct vga_device *vgadev_find(struct pci_dev *pdev)
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|
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{
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|
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struct vga_device *vgadev;
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list_for_each_entry(vgadev, &vga_list, list)
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if (pdev == vgadev->pdev)
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return vgadev;
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return NULL;
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|
|
|
}
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|
|
|
|
2016-08-12 23:48:56 +03:00
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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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|
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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
|
|
|
|
* 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
|
|
|
|
* 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()...
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|
|
|
*/
|
2009-08-11 09:52:06 +04:00
|
|
|
struct pci_dev *vga_default_device(void)
|
|
|
|
{
|
|
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|
return vga_default;
|
|
|
|
}
|
2012-04-24 12:31:28 +04:00
|
|
|
EXPORT_SYMBOL_GPL(vga_default_device);
|
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|
2012-04-17 00:26:02 +04:00
|
|
|
void vga_set_default_device(struct pci_dev *pdev)
|
|
|
|
{
|
2012-09-19 22:54:15 +04:00
|
|
|
if (vga_default == pdev)
|
|
|
|
return;
|
|
|
|
|
|
|
|
pci_dev_put(vga_default);
|
|
|
|
vga_default = pci_dev_get(pdev);
|
2012-04-17 00:26:02 +04:00
|
|
|
}
|
2009-08-11 09:52:06 +04:00
|
|
|
|
2019-03-01 12:24:59 +03:00
|
|
|
/**
|
|
|
|
* vga_remove_vgacon - deactivete vga console
|
|
|
|
*
|
|
|
|
* Unbind and unregister vgacon in case pdev is the default vga
|
|
|
|
* device. Can be called by gpu drivers on initialization to make
|
|
|
|
* sure vga register access done by vgacon will not disturb the
|
|
|
|
* device.
|
|
|
|
*
|
|
|
|
* @pdev: pci device.
|
|
|
|
*/
|
|
|
|
#if !defined(CONFIG_VGA_CONSOLE)
|
|
|
|
int vga_remove_vgacon(struct pci_dev *pdev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#elif !defined(CONFIG_DUMMY_CONSOLE)
|
|
|
|
int vga_remove_vgacon(struct pci_dev *pdev)
|
|
|
|
{
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
int vga_remove_vgacon(struct pci_dev *pdev)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (pdev != vga_default)
|
|
|
|
return 0;
|
|
|
|
vgaarb_info(&pdev->dev, "deactivate vga console\n");
|
|
|
|
|
|
|
|
console_lock();
|
|
|
|
if (con_is_bound(&vga_con))
|
|
|
|
ret = do_take_over_console(&dummy_con, 0,
|
|
|
|
MAX_NR_CONSOLES - 1, 1);
|
|
|
|
if (ret == 0) {
|
|
|
|
ret = do_unregister_con_driver(&vga_con);
|
|
|
|
|
|
|
|
/* Ignore "already unregistered". */
|
|
|
|
if (ret == -ENODEV)
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
console_unlock();
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
EXPORT_SYMBOL(vga_remove_vgacon);
|
|
|
|
|
2009-08-11 09:52:06 +04:00
|
|
|
static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
|
|
|
|
{
|
|
|
|
if (vgadev->irq_set_state)
|
|
|
|
vgadev->irq_set_state(vgadev->cookie, state);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* If we don't ever use VGA arb we should avoid
|
|
|
|
turning off anything anywhere due to old X servers getting
|
|
|
|
confused about the boot device not being VGA */
|
|
|
|
static void vga_check_first_use(void)
|
|
|
|
{
|
|
|
|
/* we should inform all GPUs in the system that
|
2011-03-31 05:57:33 +04:00
|
|
|
* VGA arb has occurred and to try and disable resources
|
2009-08-11 09:52:06 +04:00
|
|
|
* if they can */
|
|
|
|
if (!vga_arbiter_used) {
|
|
|
|
vga_arbiter_used = true;
|
|
|
|
vga_arbiter_notify_clients();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct vga_device *__vga_tryget(struct vga_device *vgadev,
|
|
|
|
unsigned int rsrc)
|
|
|
|
{
|
2016-11-17 20:47:58 +03:00
|
|
|
struct device *dev = &vgadev->pdev->dev;
|
2009-08-11 09:52:06 +04:00
|
|
|
unsigned int wants, legacy_wants, match;
|
|
|
|
struct vga_device *conflict;
|
|
|
|
unsigned int pci_bits;
|
2010-06-01 09:32:24 +04:00
|
|
|
u32 flags = 0;
|
|
|
|
|
2009-08-11 09:52:06 +04:00
|
|
|
/* 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;
|
|
|
|
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_dbg(dev, "%s: %d\n", __func__, rsrc);
|
|
|
|
vgaarb_dbg(dev, "%s: owns: %d\n", __func__, vgadev->owns);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
/* 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;
|
|
|
|
|
2014-07-03 19:59:51 +04:00
|
|
|
/* Ok, now check if it owns the resource we want. We can
|
|
|
|
* lock resources that are not decoded, therefore a device
|
|
|
|
* can own resources it doesn't decode.
|
2009-08-11 09:52:06 +04:00
|
|
|
*/
|
|
|
|
match = lwants & conflict->owns;
|
|
|
|
if (!match)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
/* looks like he doesn't have a lock, we can steal
|
|
|
|
* them from him
|
|
|
|
*/
|
|
|
|
|
2010-06-01 09:32:24 +04:00
|
|
|
flags = 0;
|
2009-08-11 09:52:06 +04:00
|
|
|
pci_bits = 0;
|
|
|
|
|
2014-07-03 19:59:51 +04:00
|
|
|
/* If we can't control legacy resources via the bridge, we
|
|
|
|
* also need to disable normal decoding.
|
|
|
|
*/
|
2010-06-01 09:32:24 +04:00
|
|
|
if (!conflict->bridge_has_one_vga) {
|
2014-07-03 19:59:51 +04:00
|
|
|
if ((match & conflict->decodes) & VGA_RSRC_LEGACY_MEM)
|
2010-06-01 09:32:24 +04:00
|
|
|
pci_bits |= PCI_COMMAND_MEMORY;
|
2014-07-03 19:59:51 +04:00
|
|
|
if ((match & conflict->decodes) & VGA_RSRC_LEGACY_IO)
|
2010-06-01 09:32:24 +04:00
|
|
|
pci_bits |= PCI_COMMAND_IO;
|
2014-07-03 19:59:51 +04:00
|
|
|
|
|
|
|
if (pci_bits) {
|
|
|
|
vga_irq_set_state(conflict, false);
|
|
|
|
flags |= PCI_VGA_STATE_CHANGE_DECODES;
|
|
|
|
}
|
2010-06-01 09:32:24 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
if (change_bridge)
|
|
|
|
flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
|
|
|
|
|
|
|
|
pci_set_vga_state(conflict->pdev, false, pci_bits, flags);
|
2013-08-16 02:37:53 +04:00
|
|
|
conflict->owns &= ~match;
|
2014-07-03 19:59:51 +04:00
|
|
|
|
|
|
|
/* If we disabled normal decoding, reflect it in owns */
|
|
|
|
if (pci_bits & PCI_COMMAND_MEMORY)
|
2009-08-11 09:52:06 +04:00
|
|
|
conflict->owns &= ~VGA_RSRC_NORMAL_MEM;
|
2014-07-03 19:59:51 +04:00
|
|
|
if (pci_bits & PCI_COMMAND_IO)
|
2009-08-11 09:52:06 +04:00
|
|
|
conflict->owns &= ~VGA_RSRC_NORMAL_IO;
|
|
|
|
}
|
|
|
|
|
|
|
|
enable_them:
|
|
|
|
/* ok dude, we got it, everybody conflicting has been disabled, let's
|
2014-07-03 19:59:51 +04:00
|
|
|
* enable us. Mark any bits in "owns" regardless of whether we
|
|
|
|
* decoded them. We can lock resources we don't decode, therefore
|
|
|
|
* we must track them via "owns".
|
2009-08-11 09:52:06 +04:00
|
|
|
*/
|
2010-06-01 09:32:24 +04:00
|
|
|
flags = 0;
|
2009-08-11 09:52:06 +04:00
|
|
|
pci_bits = 0;
|
|
|
|
|
2010-06-01 09:32:24 +04:00
|
|
|
if (!vgadev->bridge_has_one_vga) {
|
|
|
|
flags |= PCI_VGA_STATE_CHANGE_DECODES;
|
|
|
|
if (wants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
|
|
|
|
pci_bits |= PCI_COMMAND_MEMORY;
|
|
|
|
if (wants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
|
|
|
|
pci_bits |= PCI_COMMAND_IO;
|
|
|
|
}
|
2014-07-03 19:59:51 +04:00
|
|
|
if (wants & VGA_RSRC_LEGACY_MASK)
|
2010-06-01 09:32:24 +04:00
|
|
|
flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
|
|
|
|
|
|
|
|
pci_set_vga_state(vgadev->pdev, true, pci_bits, flags);
|
|
|
|
|
2015-08-12 17:32:07 +03:00
|
|
|
if (!vgadev->bridge_has_one_vga)
|
2010-06-01 09:32:24 +04:00
|
|
|
vga_irq_set_state(vgadev, true);
|
2015-08-12 17:32:07 +03:00
|
|
|
|
2014-07-03 19:59:51 +04:00
|
|
|
vgadev->owns |= wants;
|
2009-08-11 09:52:06 +04:00
|
|
|
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)
|
|
|
|
{
|
2016-11-17 20:47:58 +03:00
|
|
|
struct device *dev = &vgadev->pdev->dev;
|
2009-08-11 09:52:06 +04:00
|
|
|
unsigned int old_locks = vgadev->locks;
|
|
|
|
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_dbg(dev, "%s\n", __func__);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
/* 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);
|
|
|
|
}
|
|
|
|
|
2016-08-12 23:48:56 +03:00
|
|
|
/**
|
|
|
|
* 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 whether 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, including 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 accesses 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 differentiate VGA memory and IO afaik). You can indicate
|
|
|
|
* whether 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)
|
|
|
|
*
|
|
|
|
* On success, release the VGA resource again with vga_put().
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
*
|
|
|
|
* 0 on success, negative error code on failure.
|
|
|
|
*/
|
2009-08-11 09:52:06 +04:00
|
|
|
int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
|
|
|
|
{
|
|
|
|
struct vga_device *vgadev, *conflict;
|
|
|
|
unsigned long flags;
|
2017-06-20 13:06:13 +03:00
|
|
|
wait_queue_entry_t wait;
|
2009-08-11 09:52:06 +04:00
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
vga_check_first_use();
|
|
|
|
/* 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);
|
2015-11-30 05:17:31 +03:00
|
|
|
if (interruptible && signal_pending(current)) {
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
remove_wait_queue(&vga_wait_queue, &wait);
|
|
|
|
rc = -ERESTARTSYS;
|
2009-08-11 09:52:06 +04:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
schedule();
|
|
|
|
remove_wait_queue(&vga_wait_queue, &wait);
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(vga_get);
|
|
|
|
|
2016-08-12 23:48:56 +03:00
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
*
|
|
|
|
* On success, release the VGA resource again with vga_put().
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
*
|
|
|
|
* 0 on success, negative error code on failure.
|
|
|
|
*/
|
2009-08-11 09:52:06 +04:00
|
|
|
int vga_tryget(struct pci_dev *pdev, unsigned int rsrc)
|
|
|
|
{
|
|
|
|
struct vga_device *vgadev;
|
|
|
|
unsigned long flags;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
vga_check_first_use();
|
|
|
|
|
|
|
|
/* 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;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(vga_tryget);
|
|
|
|
|
2016-08-12 23:48:56 +03:00
|
|
|
/**
|
|
|
|
* 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 fuction 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.
|
|
|
|
*/
|
2009-08-11 09:52:06 +04:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(vga_put);
|
|
|
|
|
2015-08-12 17:32:07 +03:00
|
|
|
/*
|
|
|
|
* Rules for using a bridge to control a VGA descendant decoding: if a bridge
|
|
|
|
* has only one VGA descendant then it can be used to control the VGA routing
|
|
|
|
* for that device. It should always use the bridge closest to the device to
|
|
|
|
* control it. If a bridge has a direct VGA descendant, but also have a sub-
|
|
|
|
* bridge VGA descendant then we cannot use that bridge to control the direct
|
|
|
|
* VGA descendant. So for every device we register, we need to iterate all
|
|
|
|
* its parent bridges so we can invalidate any devices using them properly.
|
|
|
|
*/
|
2010-06-01 09:32:24 +04:00
|
|
|
static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
|
|
|
|
{
|
|
|
|
struct vga_device *same_bridge_vgadev;
|
|
|
|
struct pci_bus *new_bus, *bus;
|
|
|
|
struct pci_dev *new_bridge, *bridge;
|
|
|
|
|
|
|
|
vgadev->bridge_has_one_vga = true;
|
|
|
|
|
|
|
|
if (list_empty(&vga_list))
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* okay iterate the new devices bridge hierarachy */
|
|
|
|
new_bus = vgadev->pdev->bus;
|
|
|
|
while (new_bus) {
|
|
|
|
new_bridge = new_bus->self;
|
|
|
|
|
2011-10-10 12:29:18 +04:00
|
|
|
/* go through list of devices already registered */
|
|
|
|
list_for_each_entry(same_bridge_vgadev, &vga_list, list) {
|
|
|
|
bus = same_bridge_vgadev->pdev->bus;
|
|
|
|
bridge = bus->self;
|
|
|
|
|
|
|
|
/* see if the share a bridge with this device */
|
|
|
|
if (new_bridge == bridge) {
|
2015-08-12 17:32:07 +03:00
|
|
|
/*
|
|
|
|
* If their direct parent bridge is the same
|
|
|
|
* as any bridge of this device then it can't
|
|
|
|
* be used for that device.
|
|
|
|
*/
|
2011-10-10 12:29:18 +04:00
|
|
|
same_bridge_vgadev->bridge_has_one_vga = false;
|
|
|
|
}
|
2010-06-01 09:32:24 +04:00
|
|
|
|
2015-08-12 17:32:07 +03:00
|
|
|
/*
|
|
|
|
* 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
|
|
|
|
*/
|
2011-10-10 12:29:18 +04:00
|
|
|
while (bus) {
|
|
|
|
bridge = bus->self;
|
2015-08-12 17:32:07 +03:00
|
|
|
|
|
|
|
if (bridge && bridge == vgadev->pdev->bus->self)
|
|
|
|
vgadev->bridge_has_one_vga = false;
|
|
|
|
|
2011-10-10 12:29:18 +04:00
|
|
|
bus = bus->parent;
|
2010-06-01 09:32:24 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
new_bus = new_bus->parent;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-08-11 09:52:06 +04:00
|
|
|
/*
|
|
|
|
* 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 bool 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 false;
|
|
|
|
|
|
|
|
/* Allocate structure */
|
2015-09-30 22:57:06 +03:00
|
|
|
vgadev = kzalloc(sizeof(struct vga_device), GFP_KERNEL);
|
2009-08-11 09:52:06 +04:00
|
|
|
if (vgadev == NULL) {
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_err(&pdev->dev, "failed to allocate VGA arbiter data\n");
|
2015-08-12 17:32:07 +03:00
|
|
|
/*
|
|
|
|
* What to do on allocation failure ? For now, let's just do
|
|
|
|
* nothing, I'm not sure there is anything saner to be done.
|
2009-08-11 09:52:06 +04:00
|
|
|
*/
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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;
|
|
|
|
|
|
|
|
/* 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
|
|
|
|
*/
|
|
|
|
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;
|
2015-08-12 17:32:07 +03:00
|
|
|
|
|
|
|
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, &l);
|
2009-08-11 09:52:06 +04:00
|
|
|
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
|
|
|
|
*/
|
|
|
|
if (vga_default == NULL &&
|
2014-08-25 01:09:53 +04:00
|
|
|
((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) {
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_info(&pdev->dev, "setting as boot VGA device\n");
|
2012-09-19 22:54:15 +04:00
|
|
|
vga_set_default_device(pdev);
|
2014-08-25 01:09:53 +04:00
|
|
|
}
|
2009-08-11 09:52:06 +04:00
|
|
|
|
2010-06-01 09:32:24 +04:00
|
|
|
vga_arbiter_check_bridge_sharing(vgadev);
|
|
|
|
|
2009-08-11 09:52:06 +04:00
|
|
|
/* Add to the list */
|
2018-08-31 21:20:00 +03:00
|
|
|
list_add_tail(&vgadev->list, &vga_list);
|
2009-08-11 09:52:06 +04:00
|
|
|
vga_count++;
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_info(&pdev->dev, "VGA device added: decodes=%s,owns=%s,locks=%s\n",
|
2009-08-11 09:52:06 +04:00
|
|
|
vga_iostate_to_str(vgadev->decodes),
|
|
|
|
vga_iostate_to_str(vgadev->owns),
|
|
|
|
vga_iostate_to_str(vgadev->locks));
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&vga_lock, flags);
|
|
|
|
return true;
|
|
|
|
fail:
|
|
|
|
spin_unlock_irqrestore(&vga_lock, flags);
|
|
|
|
kfree(vgadev);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool vga_arbiter_del_pci_device(struct pci_dev *pdev)
|
|
|
|
{
|
|
|
|
struct vga_device *vgadev;
|
|
|
|
unsigned long flags;
|
|
|
|
bool ret = true;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&vga_lock, flags);
|
|
|
|
vgadev = vgadev_find(pdev);
|
|
|
|
if (vgadev == NULL) {
|
|
|
|
ret = false;
|
|
|
|
goto bail;
|
|
|
|
}
|
|
|
|
|
2012-09-19 22:54:15 +04:00
|
|
|
if (vga_default == pdev)
|
|
|
|
vga_set_default_device(NULL);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
if (vgadev->decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM))
|
|
|
|
vga_decode_count--;
|
|
|
|
|
|
|
|
/* Remove entry from list */
|
|
|
|
list_del(&vgadev->list);
|
|
|
|
vga_count--;
|
|
|
|
/* 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);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* this is called with the lock */
|
|
|
|
static inline void vga_update_device_decodes(struct vga_device *vgadev,
|
|
|
|
int new_decodes)
|
|
|
|
{
|
2016-11-17 20:47:58 +03:00
|
|
|
struct device *dev = &vgadev->pdev->dev;
|
vgaarb: Fix VGA decodes changes
When VGA decodes change we need to do a bit more evaluation of exactly what
has changed. We don't necessarily give up all the old owns resources and
we need to account for resources with locks. The new algorithm is: If
something is added, update decodes. If legacy resources were added and
none were there before, we have a new participant. If something is
removed, update decodes. If we previously owned it, we no longer own it.
If it was previously locked, invalidate all locks and release it. If
legacy resources were removed and none are left, remove the participant
from VGA arbitration.
Previously we updated decodes, released ownership of everything that was
previously decoded, ignored all locks, and went off looking for another
device to transfer VGA to. In a test case where Intel IGD removes only
legacy VGA memory decoding, this left the arbiter switching to discrete
graphics without actually disabling legacy VGA IO from the IGD. As a
bonus, we bumped up the count of VGA arbitration participants for no
good reason.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Kill now unused variables, reported by the 0-day kernel
builtbot.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-08-16 02:37:59 +04:00
|
|
|
int old_decodes, decodes_removed, decodes_unlocked;
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
old_decodes = vgadev->decodes;
|
vgaarb: Fix VGA decodes changes
When VGA decodes change we need to do a bit more evaluation of exactly what
has changed. We don't necessarily give up all the old owns resources and
we need to account for resources with locks. The new algorithm is: If
something is added, update decodes. If legacy resources were added and
none were there before, we have a new participant. If something is
removed, update decodes. If we previously owned it, we no longer own it.
If it was previously locked, invalidate all locks and release it. If
legacy resources were removed and none are left, remove the participant
from VGA arbitration.
Previously we updated decodes, released ownership of everything that was
previously decoded, ignored all locks, and went off looking for another
device to transfer VGA to. In a test case where Intel IGD removes only
legacy VGA memory decoding, this left the arbiter switching to discrete
graphics without actually disabling legacy VGA IO from the IGD. As a
bonus, we bumped up the count of VGA arbitration participants for no
good reason.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Kill now unused variables, reported by the 0-day kernel
builtbot.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-08-16 02:37:59 +04:00
|
|
|
decodes_removed = ~new_decodes & old_decodes;
|
|
|
|
decodes_unlocked = vgadev->locks & decodes_removed;
|
2009-08-11 09:52:06 +04:00
|
|
|
vgadev->decodes = new_decodes;
|
|
|
|
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_info(dev, "changed VGA decodes: olddecodes=%s,decodes=%s:owns=%s\n",
|
2009-08-11 09:52:06 +04:00
|
|
|
vga_iostate_to_str(old_decodes),
|
|
|
|
vga_iostate_to_str(vgadev->decodes),
|
|
|
|
vga_iostate_to_str(vgadev->owns));
|
|
|
|
|
vgaarb: Fix VGA decodes changes
When VGA decodes change we need to do a bit more evaluation of exactly what
has changed. We don't necessarily give up all the old owns resources and
we need to account for resources with locks. The new algorithm is: If
something is added, update decodes. If legacy resources were added and
none were there before, we have a new participant. If something is
removed, update decodes. If we previously owned it, we no longer own it.
If it was previously locked, invalidate all locks and release it. If
legacy resources were removed and none are left, remove the participant
from VGA arbitration.
Previously we updated decodes, released ownership of everything that was
previously decoded, ignored all locks, and went off looking for another
device to transfer VGA to. In a test case where Intel IGD removes only
legacy VGA memory decoding, this left the arbiter switching to discrete
graphics without actually disabling legacy VGA IO from the IGD. As a
bonus, we bumped up the count of VGA arbitration participants for no
good reason.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Kill now unused variables, reported by the 0-day kernel
builtbot.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-08-16 02:37:59 +04:00
|
|
|
/* if we removed locked decodes, lock count goes to zero, and release */
|
|
|
|
if (decodes_unlocked) {
|
|
|
|
if (decodes_unlocked & VGA_RSRC_LEGACY_IO)
|
|
|
|
vgadev->io_lock_cnt = 0;
|
|
|
|
if (decodes_unlocked & VGA_RSRC_LEGACY_MEM)
|
|
|
|
vgadev->mem_lock_cnt = 0;
|
|
|
|
__vga_put(vgadev, decodes_unlocked);
|
2009-08-11 09:52:06 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
/* change decodes counter */
|
vgaarb: Fix VGA decodes changes
When VGA decodes change we need to do a bit more evaluation of exactly what
has changed. We don't necessarily give up all the old owns resources and
we need to account for resources with locks. The new algorithm is: If
something is added, update decodes. If legacy resources were added and
none were there before, we have a new participant. If something is
removed, update decodes. If we previously owned it, we no longer own it.
If it was previously locked, invalidate all locks and release it. If
legacy resources were removed and none are left, remove the participant
from VGA arbitration.
Previously we updated decodes, released ownership of everything that was
previously decoded, ignored all locks, and went off looking for another
device to transfer VGA to. In a test case where Intel IGD removes only
legacy VGA memory decoding, this left the arbiter switching to discrete
graphics without actually disabling legacy VGA IO from the IGD. As a
bonus, we bumped up the count of VGA arbitration participants for no
good reason.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Kill now unused variables, reported by the 0-day kernel
builtbot.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-08-16 02:37:59 +04:00
|
|
|
if (old_decodes & VGA_RSRC_LEGACY_MASK &&
|
|
|
|
!(new_decodes & VGA_RSRC_LEGACY_MASK))
|
|
|
|
vga_decode_count--;
|
|
|
|
if (!(old_decodes & VGA_RSRC_LEGACY_MASK) &&
|
|
|
|
new_decodes & VGA_RSRC_LEGACY_MASK)
|
|
|
|
vga_decode_count++;
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_dbg(dev, "decoding count now is: %d\n", vga_decode_count);
|
2009-08-11 09:52:06 +04:00
|
|
|
}
|
|
|
|
|
2015-08-12 17:32:07 +03:00
|
|
|
static void __vga_set_legacy_decoding(struct pci_dev *pdev,
|
|
|
|
unsigned int decodes,
|
|
|
|
bool userspace)
|
2009-08-11 09:52:06 +04:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
|
|
|
|
/* don't let userspace futz with kernel driver decodes */
|
|
|
|
if (userspace && vgadev->set_vga_decode)
|
|
|
|
goto bail;
|
|
|
|
|
|
|
|
/* 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 ...
|
|
|
|
*/
|
|
|
|
bail:
|
|
|
|
spin_unlock_irqrestore(&vga_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes)
|
|
|
|
{
|
|
|
|
__vga_set_legacy_decoding(pdev, decodes, false);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(vga_set_legacy_decoding);
|
|
|
|
|
2016-08-12 23:48:56 +03:00
|
|
|
/**
|
|
|
|
* vga_client_register - register or unregister a VGA arbitration client
|
|
|
|
* @pdev: pci device of the VGA client
|
|
|
|
* @cookie: client cookie to be used in callbacks
|
|
|
|
* @irq_set_state: irq state change callback
|
|
|
|
* @set_vga_decode: vga decode change callback
|
|
|
|
*
|
|
|
|
* Clients have two callback mechanisms they can use.
|
|
|
|
*
|
|
|
|
* @irq_set_state callback: If a client can't disable its GPUs VGA
|
|
|
|
* resources, then we need to be able to ask it to turn off its irqs when we
|
|
|
|
* turn off its mem and io decoding.
|
|
|
|
*
|
|
|
|
* @set_vga_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.
|
|
|
|
*
|
|
|
|
* This function does not check whether a client for @pdev has been registered
|
|
|
|
* already.
|
|
|
|
*
|
|
|
|
* To unregister just call this function with @irq_set_state and @set_vga_decode
|
|
|
|
* both set to NULL for the same @pdev as originally used to register them.
|
|
|
|
*
|
|
|
|
* Returns: 0 on success, -1 on failure
|
|
|
|
*/
|
2009-08-11 09:52:06 +04:00
|
|
|
int vga_client_register(struct pci_dev *pdev, void *cookie,
|
|
|
|
void (*irq_set_state)(void *cookie, bool state),
|
2015-08-12 17:32:07 +03:00
|
|
|
unsigned int (*set_vga_decode)(void *cookie,
|
|
|
|
bool decode))
|
2009-08-11 09:52:06 +04:00
|
|
|
{
|
2011-01-20 16:09:12 +03:00
|
|
|
int ret = -ENODEV;
|
2009-08-11 09:52:06 +04:00
|
|
|
struct vga_device *vgadev;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&vga_lock, flags);
|
|
|
|
vgadev = vgadev_find(pdev);
|
|
|
|
if (!vgadev)
|
|
|
|
goto bail;
|
|
|
|
|
|
|
|
vgadev->irq_set_state = irq_set_state;
|
|
|
|
vgadev->set_vga_decode = set_vga_decode;
|
|
|
|
vgadev->cookie = cookie;
|
|
|
|
ret = 0;
|
|
|
|
|
|
|
|
bail:
|
|
|
|
spin_unlock_irqrestore(&vga_lock, flags);
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(vga_client_register);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
2010-02-03 04:45:01 +03:00
|
|
|
#define MAX_USER_CARDS CONFIG_VGA_ARB_MAX_GPUS
|
2009-08-11 09:52:06 +04:00
|
|
|
#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);
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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:%x:%x:%x.%x", domain, bus, &slot, &func);
|
|
|
|
if (n != 4)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
*devfn = PCI_DEVFN(slot, func);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2015-08-12 17:32:07 +03:00
|
|
|
static ssize_t vga_arb_read(struct file *file, char __user *buf,
|
2009-08-11 09:52:06 +04:00
|
|
|
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);
|
|
|
|
|
2011-03-31 05:57:33 +04:00
|
|
|
/* If we are targeting the default, use it */
|
2009-08-11 09:52:06 +04:00
|
|
|
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,
|
|
|
|
"count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%d:%d)\n",
|
|
|
|
vga_decode_count, 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
|
|
|
|
*/
|
2015-08-12 17:32:07 +03:00
|
|
|
static ssize_t vga_arb_write(struct file *file, const char __user *buf,
|
2009-08-11 09:52:06 +04:00
|
|
|
size_t count, loff_t *ppos)
|
|
|
|
{
|
|
|
|
struct vga_arb_private *priv = file->private_data;
|
|
|
|
struct vga_arb_user_card *uc = NULL;
|
|
|
|
struct pci_dev *pdev;
|
|
|
|
|
|
|
|
unsigned int io_state;
|
|
|
|
|
2016-10-14 16:22:22 +03:00
|
|
|
char kbuf[64], *curr_pos;
|
2009-08-11 09:52:06 +04:00
|
|
|
size_t remaining = count;
|
|
|
|
|
|
|
|
int ret_val;
|
|
|
|
int i;
|
|
|
|
|
2016-10-14 16:22:22 +03:00
|
|
|
if (count >= sizeof(kbuf))
|
|
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(kbuf, buf, count))
|
2009-08-11 09:52:06 +04:00
|
|
|
return -EFAULT;
|
|
|
|
curr_pos = kbuf;
|
|
|
|
kbuf[count] = '\0'; /* Just to make sure... */
|
|
|
|
|
|
|
|
if (strncmp(curr_pos, "lock ", 5) == 0) {
|
|
|
|
curr_pos += 5;
|
|
|
|
remaining -= 5;
|
|
|
|
|
2010-05-24 19:24:30 +04:00
|
|
|
pr_debug("client 0x%p called 'lock'\n", priv);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
2010-05-24 19:24:30 +04:00
|
|
|
pr_debug("client 0x%p called 'unlock'\n", priv);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
for (i = 0; i < MAX_USER_CARDS; i++) {
|
|
|
|
if (priv->cards[i].pdev == pdev)
|
|
|
|
uc = &priv->cards[i];
|
|
|
|
}
|
|
|
|
|
2011-11-16 02:53:11 +04:00
|
|
|
if (!uc) {
|
|
|
|
ret_val = -EINVAL;
|
|
|
|
goto done;
|
|
|
|
}
|
2009-08-11 09:52:06 +04:00
|
|
|
|
2011-11-16 02:53:11 +04:00
|
|
|
if (io_state & VGA_RSRC_LEGACY_IO && uc->io_cnt == 0) {
|
|
|
|
ret_val = -EINVAL;
|
|
|
|
goto done;
|
|
|
|
}
|
2009-08-11 09:52:06 +04:00
|
|
|
|
2011-11-16 02:53:11 +04:00
|
|
|
if (io_state & VGA_RSRC_LEGACY_MEM && uc->mem_cnt == 0) {
|
|
|
|
ret_val = -EINVAL;
|
|
|
|
goto done;
|
|
|
|
}
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
vga_put(pdev, io_state);
|
|
|
|
|
|
|
|
if (io_state & VGA_RSRC_LEGACY_IO)
|
|
|
|
uc->io_cnt--;
|
|
|
|
if (io_state & VGA_RSRC_LEGACY_MEM)
|
|
|
|
uc->mem_cnt--;
|
|
|
|
|
|
|
|
ret_val = count;
|
|
|
|
goto done;
|
|
|
|
} else if (strncmp(curr_pos, "trylock ", 8) == 0) {
|
|
|
|
curr_pos += 8;
|
|
|
|
remaining -= 8;
|
|
|
|
|
2010-05-24 19:24:30 +04:00
|
|
|
pr_debug("client 0x%p called 'trylock'\n", priv);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
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;
|
2010-05-24 19:24:30 +04:00
|
|
|
pr_debug("client 0x%p called 'target'\n", priv);
|
2009-08-11 09:52:06 +04:00
|
|
|
/* if target is default */
|
2010-02-17 00:18:37 +03:00
|
|
|
if (!strncmp(curr_pos, "default", 7))
|
2009-08-11 09:52:06 +04:00
|
|
|
pdev = pci_dev_get(vga_default_device());
|
|
|
|
else {
|
|
|
|
if (!vga_pci_str_to_vars(curr_pos, remaining,
|
|
|
|
&domain, &bus, &devfn)) {
|
|
|
|
ret_val = -EPROTO;
|
|
|
|
goto done;
|
|
|
|
}
|
2012-08-28 19:43:55 +04:00
|
|
|
pdev = pci_get_domain_bus_and_slot(domain, bus, devfn);
|
2009-08-11 09:52:06 +04:00
|
|
|
if (!pdev) {
|
2016-11-18 17:11:58 +03:00
|
|
|
pr_debug("invalid PCI address %04x:%02x:%02x.%x\n",
|
|
|
|
domain, bus, PCI_SLOT(devfn),
|
|
|
|
PCI_FUNC(devfn));
|
2009-08-11 09:52:06 +04:00
|
|
|
ret_val = -ENODEV;
|
|
|
|
goto done;
|
|
|
|
}
|
2016-11-17 20:47:58 +03:00
|
|
|
|
|
|
|
pr_debug("%s ==> %04x:%02x:%02x.%x pdev %p\n", curr_pos,
|
|
|
|
domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
|
|
|
|
pdev);
|
2009-08-11 09:52:06 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
vgadev = vgadev_find(pdev);
|
2015-08-12 17:32:06 +03:00
|
|
|
pr_debug("vgadev %p\n", vgadev);
|
2009-08-11 09:52:06 +04:00
|
|
|
if (vgadev == NULL) {
|
2015-08-12 17:32:05 +03:00
|
|
|
if (pdev) {
|
2016-11-18 17:11:58 +03:00
|
|
|
vgaarb_dbg(&pdev->dev, "not a VGA device\n");
|
2015-08-12 17:32:05 +03:00
|
|
|
pci_dev_put(pdev);
|
|
|
|
}
|
|
|
|
|
2009-08-11 09:52:06 +04:00
|
|
|
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) {
|
2016-11-18 17:11:58 +03:00
|
|
|
vgaarb_dbg(&pdev->dev, "maximum user cards (%d) number reached, ignoring this one!\n",
|
2010-02-03 01:38:15 +03:00
|
|
|
MAX_USER_CARDS);
|
2009-08-11 09:52:06 +04:00
|
|
|
pci_dev_put(pdev);
|
|
|
|
/* XXX: which value to return? */
|
|
|
|
ret_val = -ENOMEM;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret_val = count;
|
|
|
|
pci_dev_put(pdev);
|
|
|
|
goto done;
|
|
|
|
|
|
|
|
|
|
|
|
} else if (strncmp(curr_pos, "decodes ", 8) == 0) {
|
|
|
|
curr_pos += 8;
|
|
|
|
remaining -= 8;
|
2015-08-12 17:32:06 +03:00
|
|
|
pr_debug("client 0x%p called 'decodes'\n", priv);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
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, true);
|
|
|
|
ret_val = count;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
/* If we got here, the message written is not part of the protocol! */
|
|
|
|
return -EPROTO;
|
|
|
|
|
|
|
|
done:
|
|
|
|
return ret_val;
|
|
|
|
}
|
|
|
|
|
2017-07-03 13:39:46 +03:00
|
|
|
static __poll_t vga_arb_fpoll(struct file *file, poll_table *wait)
|
2009-08-11 09:52:06 +04:00
|
|
|
{
|
2010-05-24 19:24:30 +04:00
|
|
|
pr_debug("%s\n", __func__);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
poll_wait(file, &vga_wait_queue, wait);
|
2018-02-12 01:34:03 +03:00
|
|
|
return EPOLLIN;
|
2009-08-11 09:52:06 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static int vga_arb_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct vga_arb_private *priv;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2010-05-24 19:24:30 +04:00
|
|
|
pr_debug("%s\n", __func__);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
2011-07-26 04:12:56 +04:00
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
2009-08-11 09:52:06 +04:00
|
|
|
if (priv == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
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;
|
|
|
|
|
2010-05-24 19:24:30 +04:00
|
|
|
pr_debug("%s\n", __func__);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
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;
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_dbg(&uc->pdev->dev, "uc->io_cnt == %d, uc->mem_cnt == %d\n",
|
|
|
|
uc->io_cnt, uc->mem_cnt);
|
2009-08-11 09:52:06 +04:00
|
|
|
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)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* callback any registered clients to let them know we have a
|
|
|
|
* change in VGA cards
|
|
|
|
*/
|
|
|
|
static void vga_arbiter_notify_clients(void)
|
|
|
|
{
|
|
|
|
struct vga_device *vgadev;
|
|
|
|
unsigned long flags;
|
|
|
|
uint32_t new_decodes;
|
|
|
|
bool new_state;
|
|
|
|
|
|
|
|
if (!vga_arbiter_used)
|
|
|
|
return;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&vga_lock, flags);
|
|
|
|
list_for_each_entry(vgadev, &vga_list, list) {
|
|
|
|
if (vga_count > 1)
|
|
|
|
new_state = false;
|
|
|
|
else
|
|
|
|
new_state = true;
|
|
|
|
if (vgadev->set_vga_decode) {
|
2015-08-12 17:32:07 +03:00
|
|
|
new_decodes = vgadev->set_vga_decode(vgadev->cookie,
|
|
|
|
new_state);
|
2009-08-11 09:52:06 +04:00
|
|
|
vga_update_device_decodes(vgadev, new_decodes);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&vga_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
bool notify = false;
|
|
|
|
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_dbg(dev, "%s\n", __func__);
|
2009-08-11 09:52:06 +04:00
|
|
|
|
|
|
|
/* 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)
|
|
|
|
notify = vga_arbiter_add_pci_device(pdev);
|
|
|
|
else if (action == BUS_NOTIFY_DEL_DEVICE)
|
|
|
|
notify = vga_arbiter_del_pci_device(pdev);
|
|
|
|
|
|
|
|
if (notify)
|
|
|
|
vga_arbiter_notify_clients();
|
|
|
|
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,
|
llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 20:52:59 +04:00
|
|
|
.llseek = noop_llseek,
|
2009-08-11 09:52:06 +04:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice vga_arb_device = {
|
|
|
|
MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops
|
|
|
|
};
|
|
|
|
|
2017-10-13 06:47:29 +03:00
|
|
|
static void __init vga_arb_select_default_device(void)
|
2009-08-11 09:52:06 +04:00
|
|
|
{
|
|
|
|
struct pci_dev *pdev;
|
2010-06-01 09:32:24 +04:00
|
|
|
struct vga_device *vgadev;
|
2009-08-11 09:52:06 +04:00
|
|
|
|
2017-10-13 06:47:29 +03:00
|
|
|
#if defined(CONFIG_X86) || defined(CONFIG_IA64)
|
2018-08-31 21:19:59 +03:00
|
|
|
u64 base = screen_info.lfb_base;
|
|
|
|
u64 size = screen_info.lfb_size;
|
|
|
|
u64 limit;
|
|
|
|
resource_size_t start, end;
|
|
|
|
unsigned long flags;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
|
|
|
|
base |= (u64)screen_info.ext_lfb_base << 32;
|
|
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|
|
limit = base + size;
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|
|
|
|
2010-06-01 09:32:24 +04:00
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list_for_each_entry(vgadev, &vga_list, list) {
|
2016-11-22 17:34:19 +03:00
|
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|
struct device *dev = &vgadev->pdev->dev;
|
2015-08-12 17:32:07 +03:00
|
|
|
/*
|
|
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* Override vga_arbiter_add_pci_device()'s I/O based detection
|
|
|
|
* as it may take the wrong device (e.g. on Apple system under
|
|
|
|
* EFI).
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2014-08-25 01:09:53 +04:00
|
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|
*
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2015-08-12 17:32:07 +03:00
|
|
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* Select the device owning the boot framebuffer if there is
|
|
|
|
* one.
|
2014-08-25 01:09:53 +04:00
|
|
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*/
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2015-08-12 17:32:07 +03:00
|
|
|
|
2014-08-25 01:09:53 +04:00
|
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/* Does firmware framebuffer belong to us? */
|
|
|
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for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
|
2015-08-12 17:32:07 +03:00
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|
flags = pci_resource_flags(vgadev->pdev, i);
|
|
|
|
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if ((flags & IORESOURCE_MEM) == 0)
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2014-08-25 01:09:53 +04:00
|
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|
continue;
|
|
|
|
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start = pci_resource_start(vgadev->pdev, i);
|
|
|
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end = pci_resource_end(vgadev->pdev, i);
|
|
|
|
|
|
|
|
if (!start || !end)
|
|
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|
continue;
|
|
|
|
|
2018-08-31 21:19:59 +03:00
|
|
|
if (base < start || limit >= end)
|
2014-08-25 01:09:53 +04:00
|
|
|
continue;
|
2015-08-12 17:32:07 +03:00
|
|
|
|
2014-08-25 01:09:53 +04:00
|
|
|
if (!vga_default_device())
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_info(dev, "setting as boot device\n");
|
2014-08-25 01:09:53 +04:00
|
|
|
else if (vgadev->pdev != vga_default_device())
|
2016-11-17 20:47:58 +03:00
|
|
|
vgaarb_info(dev, "overriding boot device\n");
|
2014-08-25 01:09:53 +04:00
|
|
|
vga_set_default_device(vgadev->pdev);
|
|
|
|
}
|
2010-06-01 09:32:24 +04:00
|
|
|
}
|
2017-10-13 06:47:29 +03:00
|
|
|
#endif
|
2016-11-17 20:47:58 +03:00
|
|
|
|
vgaarb: Select a default VGA device even if there's no legacy VGA
Daniel Axtens reported that on the HiSilicon D05 board, the VGA device is
behind a bridge that doesn't support PCI_BRIDGE_CTL_VGA, so the VGA arbiter
never selects it as the default, which means Xorg auto-detection doesn't
work.
VGA is a legacy PCI feature: a VGA device can respond to addresses, e.g.,
[mem 0xa0000-0xbffff], [io 0x3b0-0x3bb], [io 0x3c0-0x3df], etc., that are
not configurable by BARs. Consequently, multiple VGA devices can conflict
with each other. The VGA arbiter avoids conflicts by ensuring that those
legacy resources are only routed to one VGA device at a time.
The arbiter identifies the "default VGA" device, i.e., a legacy VGA device
that was used by boot firmware. It selects the first device that:
- is of PCI_CLASS_DISPLAY_VGA,
- has both PCI_COMMAND_IO and PCI_COMMAND_MEMORY enabled, and
- has PCI_BRIDGE_CTL_VGA set in all upstream bridges.
Some systems don't have such a device. For example, if a host bridge
doesn't support I/O space, PCI_COMMAND_IO probably won't be enabled for any
devices below it. Or, as on the HiSilicon D05, the VGA device may be
behind a bridge that doesn't support PCI_BRIDGE_CTL_VGA, so accesses to the
legacy VGA resources will never reach the device.
This patch extends the arbiter so that if it doesn't find a device that
meets all the above criteria, it selects the first device that:
- is of PCI_CLASS_DISPLAY_VGA and
- has PCI_COMMAND_IO or PCI_COMMAND_MEMORY enabled
If it doesn't find even that, it selects the first device that:
- is of class PCI_CLASS_DISPLAY_VGA.
Such a device may not be able to use the legacy VGA resources, but most
drivers can operate the device without those. Setting it as the default
device means its "boot_vga" sysfs file will contain "1", which Xorg (via
libpciaccess) uses to help select its default output device.
This fixes Xorg auto-detection on some arm64 systems (HiSilicon D05 in
particular; see the link below).
It also replaces the powerpc fixup_vga() quirk, albeit with slightly
different semantics: the quirk selected the first VGA device we found, and
overrode that selection with any enabled VGA device we found. If there
were several enabled VGA devices, the *last* one we found would become the
default.
The code here instead selects the *first* enabled VGA device we find, and
if none are enabled, the first VGA device we find.
Link: http://lkml.kernel.org/r/20170901072744.2409-1-dja@axtens.net
Tested-by: Daniel Axtens <dja@axtens.net> # arm64, ppc64-qemu-tcg
Tested-by: Zhou Wang <wangzhou1@hisilicon.com> # D05 Hisi Hip07, Hip08
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171013034721.14630.65913.stgit@bhelgaas-glaptop.roam.corp.google.com
2017-10-13 06:47:22 +03:00
|
|
|
if (!vga_default_device()) {
|
|
|
|
list_for_each_entry(vgadev, &vga_list, list) {
|
|
|
|
struct device *dev = &vgadev->pdev->dev;
|
|
|
|
u16 cmd;
|
|
|
|
|
|
|
|
pdev = vgadev->pdev;
|
|
|
|
pci_read_config_word(pdev, PCI_COMMAND, &cmd);
|
|
|
|
if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
|
|
|
|
vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n");
|
|
|
|
vga_set_default_device(pdev);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!vga_default_device()) {
|
|
|
|
vgadev = list_first_entry_or_null(&vga_list,
|
|
|
|
struct vga_device, list);
|
|
|
|
if (vgadev) {
|
|
|
|
struct device *dev = &vgadev->pdev->dev;
|
|
|
|
vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n");
|
|
|
|
vga_set_default_device(vgadev->pdev);
|
|
|
|
}
|
|
|
|
}
|
2017-10-13 06:47:29 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
static int __init vga_arb_device_init(void)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
struct pci_dev *pdev;
|
|
|
|
struct vga_device *vgadev;
|
|
|
|
|
|
|
|
rc = misc_register(&vga_arb_device);
|
|
|
|
if (rc < 0)
|
|
|
|
pr_err("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);
|
|
|
|
|
|
|
|
list_for_each_entry(vgadev, &vga_list, list) {
|
|
|
|
struct device *dev = &vgadev->pdev->dev;
|
|
|
|
|
|
|
|
if (vgadev->bridge_has_one_vga)
|
|
|
|
vgaarb_info(dev, "bridge control possible\n");
|
|
|
|
else
|
|
|
|
vgaarb_info(dev, "no bridge control possible\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
vga_arb_select_default_device();
|
vgaarb: Select a default VGA device even if there's no legacy VGA
Daniel Axtens reported that on the HiSilicon D05 board, the VGA device is
behind a bridge that doesn't support PCI_BRIDGE_CTL_VGA, so the VGA arbiter
never selects it as the default, which means Xorg auto-detection doesn't
work.
VGA is a legacy PCI feature: a VGA device can respond to addresses, e.g.,
[mem 0xa0000-0xbffff], [io 0x3b0-0x3bb], [io 0x3c0-0x3df], etc., that are
not configurable by BARs. Consequently, multiple VGA devices can conflict
with each other. The VGA arbiter avoids conflicts by ensuring that those
legacy resources are only routed to one VGA device at a time.
The arbiter identifies the "default VGA" device, i.e., a legacy VGA device
that was used by boot firmware. It selects the first device that:
- is of PCI_CLASS_DISPLAY_VGA,
- has both PCI_COMMAND_IO and PCI_COMMAND_MEMORY enabled, and
- has PCI_BRIDGE_CTL_VGA set in all upstream bridges.
Some systems don't have such a device. For example, if a host bridge
doesn't support I/O space, PCI_COMMAND_IO probably won't be enabled for any
devices below it. Or, as on the HiSilicon D05, the VGA device may be
behind a bridge that doesn't support PCI_BRIDGE_CTL_VGA, so accesses to the
legacy VGA resources will never reach the device.
This patch extends the arbiter so that if it doesn't find a device that
meets all the above criteria, it selects the first device that:
- is of PCI_CLASS_DISPLAY_VGA and
- has PCI_COMMAND_IO or PCI_COMMAND_MEMORY enabled
If it doesn't find even that, it selects the first device that:
- is of class PCI_CLASS_DISPLAY_VGA.
Such a device may not be able to use the legacy VGA resources, but most
drivers can operate the device without those. Setting it as the default
device means its "boot_vga" sysfs file will contain "1", which Xorg (via
libpciaccess) uses to help select its default output device.
This fixes Xorg auto-detection on some arm64 systems (HiSilicon D05 in
particular; see the link below).
It also replaces the powerpc fixup_vga() quirk, albeit with slightly
different semantics: the quirk selected the first VGA device we found, and
overrode that selection with any enabled VGA device we found. If there
were several enabled VGA devices, the *last* one we found would become the
default.
The code here instead selects the *first* enabled VGA device we find, and
if none are enabled, the first VGA device we find.
Link: http://lkml.kernel.org/r/20170901072744.2409-1-dja@axtens.net
Tested-by: Daniel Axtens <dja@axtens.net> # arm64, ppc64-qemu-tcg
Tested-by: Zhou Wang <wangzhou1@hisilicon.com> # D05 Hisi Hip07, Hip08
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171013034721.14630.65913.stgit@bhelgaas-glaptop.roam.corp.google.com
2017-10-13 06:47:22 +03:00
|
|
|
|
2016-11-17 20:47:58 +03:00
|
|
|
pr_info("loaded\n");
|
2009-08-11 09:52:06 +04:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
subsys_initcall(vga_arb_device_init);
|