6bc6a54280
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
88 lines
3.5 KiB
C
88 lines
3.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1995 Bruce D. Evans.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MD_VAR_H_
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#define _MACHINE_MD_VAR_H_
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#include <x86/x86_var.h>
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extern uint64_t *vm_page_dump;
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extern int hw_lower_amd64_sharedpage;
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extern int hw_ibrs_disable;
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extern int hw_ssb_disable;
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extern int nmi_flush_l1d_sw;
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extern int syscall_ret_l1d_flush_mode;
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extern vm_paddr_t intel_graphics_stolen_base;
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extern vm_paddr_t intel_graphics_stolen_size;
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/*
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* The file "conf/ldscript.amd64" defines the symbol "kernphys". Its
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* value is the physical address at which the kernel is loaded.
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*/
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extern char kernphys[];
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struct savefpu;
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struct sysentvec;
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void amd64_conf_fast_syscall(void);
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void amd64_db_resume_dbreg(void);
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void amd64_lower_shared_page(struct sysentvec *);
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void amd64_syscall(struct thread *td, int traced);
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void amd64_syscall_ret_flush_l1d(int error);
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void amd64_syscall_ret_flush_l1d_recalc(void);
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void doreti_iret(void) __asm(__STRING(doreti_iret));
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void doreti_iret_fault(void) __asm(__STRING(doreti_iret_fault));
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void flush_l1d_sw_abi(void);
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void ld_ds(void) __asm(__STRING(ld_ds));
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void ld_es(void) __asm(__STRING(ld_es));
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void ld_fs(void) __asm(__STRING(ld_fs));
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void ld_gs(void) __asm(__STRING(ld_gs));
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void ld_fsbase(void) __asm(__STRING(ld_fsbase));
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void ld_gsbase(void) __asm(__STRING(ld_gsbase));
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void ds_load_fault(void) __asm(__STRING(ds_load_fault));
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void es_load_fault(void) __asm(__STRING(es_load_fault));
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void fs_load_fault(void) __asm(__STRING(fs_load_fault));
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void gs_load_fault(void) __asm(__STRING(gs_load_fault));
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void fsbase_load_fault(void) __asm(__STRING(fsbase_load_fault));
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void gsbase_load_fault(void) __asm(__STRING(gsbase_load_fault));
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void fpstate_drop(struct thread *td);
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void pagezero(void *addr);
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void setidt(int idx, alias_for_inthand_t *func, int typ, int dpl, int ist);
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void sse2_pagezero(void *addr);
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struct savefpu *get_pcb_user_save_td(struct thread *td);
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struct savefpu *get_pcb_user_save_pcb(struct pcb *pcb);
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void pci_early_quirks(void);
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#endif /* !_MACHINE_MD_VAR_H_ */
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