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freebsd-dev/sys/x86/pci/pci_early_quirks.c
Konstantin Belousov 6bc6a54280 Add pci_early function to detect Intel stolen memory. 
On some Intel devices BIOS does not properly reserve memory (called
"stolen memory") for the GPU.  If the stolen memory is claimed by the
OS, functions that depend on stolen memory (like frame buffer
compression) can't be used.

A function called pci_early_quirks that is called before the virtual
memory system is started was added. In Linux, this PCI early quirks
function iterates through all PCI slots to check for any device that
require quirks.  While this more generic solution is preferable I only
ported the Intel graphics specific parts because I think my
implementation would be too similar to Linux GPL'd solution after
looking at the Linux code too much.

The code regarding Intel graphics stolen memory was ported from
Linux. In the case of Intel graphics stolen memory this
pci_early_quirks will read the stolen memory base and size from north
bridge registers.  The values are stored in global variables that is
later read by linuxkpi_gplv2. Linuxkpi stores these values in a
Linux-specific structure that is read by the drm driver.

Relevant linuxkpi code is here:
https://github.com/FreeBSDDesktop/kms-drm/blob/drm-v4.16/linuxkpi/gplv2/src/linux_compat.c#L37

For now, only amd64 arch is suppor ted since that is the only arch
supported by the new drm drivers. I was told that Intel GPUs are
always located on 0:2:0 so these values are hard coded for now.

Note that the structure and early execution of the detection code is
not required in its current form, but we expect that the code will be
added shortly which fixes the potential BIOS bugs by reserving the
stolen range in phys_avail[].  This must be done as early as possible
to avoid conflicts with the potential usage of the memory in kernel.

Submitted by:	Johannes Lundberg <johalun0@gmail.com>
Reviewed by:	bwidawsk, imp
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D16719
Differential revision:	https://reviews.freebsd.org/D17775
2018-10-31 23:17:00 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Johannes Lundberg
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <vm/vm.h>
/* XXX: enable this once the KPI is available */
/* #include <x86/physmem.h> */
#include <machine/pci_cfgreg.h>
#include <machine/md_var.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <x86/pci/pci_early_quirks.h>
#define MiB(v) ((unsigned long)(v) << 20)
struct pci_device_id {
uint32_t vendor;
uint32_t device;
const struct intel_stolen_ops *data;
};
/*
* These global variables are read by LinuxKPI.
* LinuxKPI provide this information to the i915 driver.
*/
vm_paddr_t intel_graphics_stolen_base = 0;
vm_paddr_t intel_graphics_stolen_size = 0;
/*
* Intel early quirks functions
*/
static vm_paddr_t
intel_stolen_base_gen3(int bus, int slot, int func)
{
uint32_t ctrl;
vm_paddr_t val;
ctrl = pci_cfgregread(bus, slot, func, INTEL_BSM, 4);
val = ctrl & INTEL_BSM_MASK;
return (val);
}
static vm_paddr_t
intel_stolen_size_gen3(int bus, int slot, int func)
{
uint32_t ctrl;
vm_paddr_t val;
ctrl = pci_cfgregread(0, 0, 0, I830_GMCH_CTRL, 2);
val = ctrl & I855_GMCH_GMS_MASK;
switch (val) {
case I855_GMCH_GMS_STOLEN_1M:
return (MiB(1));
case I855_GMCH_GMS_STOLEN_4M:
return (MiB(4));
case I855_GMCH_GMS_STOLEN_8M:
return (MiB(8));
case I855_GMCH_GMS_STOLEN_16M:
return (MiB(16));
case I855_GMCH_GMS_STOLEN_32M:
return (MiB(32));
case I915_GMCH_GMS_STOLEN_48M:
return (MiB(48));
case I915_GMCH_GMS_STOLEN_64M:
return (MiB(64));
case G33_GMCH_GMS_STOLEN_128M:
return (MiB(128));
case G33_GMCH_GMS_STOLEN_256M:
return (MiB(256));
case INTEL_GMCH_GMS_STOLEN_96M:
return (MiB(96));
case INTEL_GMCH_GMS_STOLEN_160M:
return (MiB(160));
case INTEL_GMCH_GMS_STOLEN_224M:
return (MiB(224));
case INTEL_GMCH_GMS_STOLEN_352M:
return (MiB(352));
}
return (0);
}
static vm_paddr_t
intel_stolen_size_gen6(int bus, int slot, int func)
{
uint32_t ctrl;
vm_paddr_t val;
ctrl = pci_cfgregread(bus, slot, func, SNB_GMCH_CTRL, 2);
val = (ctrl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
return (val * MiB(32));
}
static vm_paddr_t
intel_stolen_size_gen8(int bus, int slot, int func)
{
uint32_t ctrl;
vm_paddr_t val;
ctrl = pci_cfgregread(bus, slot, func, SNB_GMCH_CTRL, 2);
val = (ctrl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
return (val * MiB(32));
}
static vm_paddr_t
intel_stolen_size_chv(int bus, int slot, int func)
{
uint32_t ctrl;
vm_paddr_t val;
ctrl = pci_cfgregread(bus, slot, func, SNB_GMCH_CTRL, 2);
val = (ctrl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
/*
* 0x0 to 0x10: 32MB increments starting at 0MB
* 0x11 to 0x16: 4MB increments starting at 8MB
* 0x17 to 0x1d: 4MB increments start at 36MB
*/
if (val < 0x11)
return (val * MiB(32));
else if (val < 0x17)
return ((val - 0x11) * MiB(4) + MiB(8));
else
return ((val - 0x17) * MiB(4) + MiB(36));
}
static vm_paddr_t
intel_stolen_size_gen9(int bus, int slot, int func)
{
uint32_t ctrl;
vm_paddr_t val;
ctrl = pci_cfgregread(bus, slot, func, SNB_GMCH_CTRL, 2);
val = (ctrl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
/* 0x0 to 0xEF: 32MB increments starting at 0MB */
/* 0xF0 to 0xFE: 4MB increments starting at 4MB */
if (val < 0xF0)
return (val * MiB(32));
return ((val - 0xF0) * MiB(4) + MiB(4));
}
struct intel_stolen_ops {
vm_paddr_t (*base)(int bus, int slot, int func);
vm_paddr_t (*size)(int bus, int slot, int func);
};
static const struct intel_stolen_ops intel_stolen_ops_gen3 = {
.base = intel_stolen_base_gen3,
.size = intel_stolen_size_gen3,
};
static const struct intel_stolen_ops intel_stolen_ops_gen6 = {
.base = intel_stolen_base_gen3,
.size = intel_stolen_size_gen6,
};
static const struct intel_stolen_ops intel_stolen_ops_gen8 = {
.base = intel_stolen_base_gen3,
.size = intel_stolen_size_gen8,
};
static const struct intel_stolen_ops intel_stolen_ops_gen9 = {
.base = intel_stolen_base_gen3,
.size = intel_stolen_size_gen9,
};
static const struct intel_stolen_ops intel_stolen_ops_chv = {
.base = intel_stolen_base_gen3,
.size = intel_stolen_size_chv,
};
static const struct pci_device_id intel_ids[] = {
INTEL_I915G_IDS(&intel_stolen_ops_gen3),
INTEL_I915GM_IDS(&intel_stolen_ops_gen3),
INTEL_I945G_IDS(&intel_stolen_ops_gen3),
INTEL_I945GM_IDS(&intel_stolen_ops_gen3),
INTEL_VLV_IDS(&intel_stolen_ops_gen6),
INTEL_PINEVIEW_IDS(&intel_stolen_ops_gen3),
INTEL_I965G_IDS(&intel_stolen_ops_gen3),
INTEL_G33_IDS(&intel_stolen_ops_gen3),
INTEL_I965GM_IDS(&intel_stolen_ops_gen3),
INTEL_GM45_IDS(&intel_stolen_ops_gen3),
INTEL_G45_IDS(&intel_stolen_ops_gen3),
INTEL_IRONLAKE_D_IDS(&intel_stolen_ops_gen3),
INTEL_IRONLAKE_M_IDS(&intel_stolen_ops_gen3),
INTEL_SNB_D_IDS(&intel_stolen_ops_gen6),
INTEL_SNB_M_IDS(&intel_stolen_ops_gen6),
INTEL_IVB_M_IDS(&intel_stolen_ops_gen6),
INTEL_IVB_D_IDS(&intel_stolen_ops_gen6),
INTEL_HSW_IDS(&intel_stolen_ops_gen6),
INTEL_BDW_IDS(&intel_stolen_ops_gen8),
INTEL_CHV_IDS(&intel_stolen_ops_chv),
INTEL_SKL_IDS(&intel_stolen_ops_gen9),
INTEL_BXT_IDS(&intel_stolen_ops_gen9),
INTEL_KBL_IDS(&intel_stolen_ops_gen9),
INTEL_CFL_IDS(&intel_stolen_ops_gen9),
INTEL_GLK_IDS(&intel_stolen_ops_gen9),
INTEL_CNL_IDS(&intel_stolen_ops_gen9),
};
/*
* Buggy BIOS don't reserve memory for the GPU properly and the OS
* can claim it before the GPU driver is loaded. This function will
* check the registers for base and size of this memory and reserve
* it for the GPU driver.
* gen3 (2004) and newer devices are supported. Support for older hw
* can be ported from Linux if needed.
*/
static void
intel_graphics_stolen(void)
{
const struct intel_stolen_ops *ops;
uint32_t vendor, device, class;
int i;
/* XXX: Scan bus instead of assuming 0:2:0? */
const int bus = 0;
const int slot = 2;
const int func = 0;
if (pci_cfgregopen() == 0)
return;
vendor = pci_cfgregread(bus, slot, func, PCIR_VENDOR, 2);
if (vendor != PCI_VENDOR_INTEL)
return;
class = pci_cfgregread(bus, slot, func, PCIR_SUBCLASS, 2);
if (class != PCI_CLASS_VGA)
return;
device = pci_cfgregread(bus, slot, func, PCIR_DEVICE, 2);
if (device == 0xFFFF)
return;
for (i = 0; i < nitems(intel_ids); i++) {
if (intel_ids[i].device != device)
continue;
ops = intel_ids[i].data;
intel_graphics_stolen_base = ops->base(bus, slot, func);
intel_graphics_stolen_size = ops->size(bus, slot, func);
break;
}
/* XXX: enable this once the KPI is available */
/* phys_avail_reserve(intel_graphics_stolen_base, */
/* intel_graphics_stolen_base + intel_graphics_stolen_size); */
}
void
pci_early_quirks(void)
{
intel_graphics_stolen();
}
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