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MIPS: Loongson 3: Keep CPU physical (not virtual) addresses in shadow ROM resource

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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>
This commit is contained in:
Bjorn Helgaas 2016-03-02 21:42:04 -06:00
parent 53f0a50977
commit 97f47e73c4
1 changed files with 7 additions and 2 deletions
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9
arch/mips/pci/fixup-loongson3.c
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@ -48,9 +48,14 @@ static void pci_fixup_radeon(struct pci_dev *pdev)
if (!loongson_sysconf.vgabios_addr)
return;
res->start = loongson_sysconf.vgabios_addr;
pci_disable_rom(pdev);
if (res->parent)
release_resource(res);
res->start = virt_to_phys((void *) loongson_sysconf.vgabios_addr);
res->end = res->start + 256*1024 - 1;
res->flags |= IORESOURCE_ROM_COPY;
res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
IORESOURCE_PCI_FIXED;
dev_info(&pdev->dev, "BAR %d: assigned %pR for Radeon ROM\n",
PCI_ROM_RESOURCE, res);