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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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97f47e73c4
Loongson 3 used the IORESOURCE_ROM_COPY flag for its ROM resource. There
are two problems with this:
- When IORESOURCE_ROM_COPY is set, pci_map_rom() assumes the resource
contains virtual addresses, so it doesn't ioremap the resource. This
implies loongson_sysconf.vgabios_addr is a virtual address. That's a
problem because resources should contain CPU *physical* addresses not
virtual addresses.
- When IORESOURCE_ROM_COPY is set, pci_cleanup_rom() calls kfree() on the
resource. We did not kmalloc() the loongson_sysconf.vgabios_addr area,
so it is incorrect to kfree() it.
If we're using a shadow copy in RAM for the Loongson 3 VGA BIOS area,
disable the ROM BAR and release the address space it was consuming.
Use IORESOURCE_ROM_SHADOW instead of IORESOURCE_ROM_COPY. This means the
struct resource contains CPU physical addresses, and pci_map_rom() will
ioremap() it as needed.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* fixup-loongson3.c
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*
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* Copyright (C) 2012 Lemote, Inc.
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* Author: Xiang Yu, xiangy@lemote.com
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* Chen Huacai, chenhc@lemote.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/pci.h>
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#include <boot_param.h>
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static void print_fixup_info(const struct pci_dev *pdev)
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{
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dev_info(&pdev->dev, "Device %x:%x, irq %d\n",
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pdev->vendor, pdev->device, pdev->irq);
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}
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int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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print_fixup_info(dev);
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return dev->irq;
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}
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static void pci_fixup_radeon(struct pci_dev *pdev)
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{
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struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
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if (res->start)
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return;
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if (!loongson_sysconf.vgabios_addr)
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return;
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pci_disable_rom(pdev);
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if (res->parent)
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release_resource(res);
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res->start = virt_to_phys((void *) loongson_sysconf.vgabios_addr);
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res->end = res->start + 256*1024 - 1;
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res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
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IORESOURCE_PCI_FIXED;
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dev_info(&pdev->dev, "BAR %d: assigned %pR for Radeon ROM\n",
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PCI_ROM_RESOURCE, res);
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}
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DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_ATI, PCI_ANY_ID,
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PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_radeon);
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/* Do platform specific device initialization at pci_enable_device() time */
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int pcibios_plat_dev_init(struct pci_dev *dev)
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{
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return 0;
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}
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