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[Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option
From: |
Gleb Natapov |
Subject: |
[Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR. |
Date: |
Mon, 12 Oct 2009 15:29:25 +0200 |
On Mon, Oct 12, 2009 at 03:20:27PM +0200, Michael S. Tsirkin wrote:
> Right. And there's another bug that I see and that is that size for I/O
> BAR was calculated incorrectly: val & ~0xf is wrong for I/O as the size
> could be 4 bytes. So here's a patch that addresses all 3 issues:
> Ack?
>
Pleas do whatever spec recommends and use 0xffffffff to size the BAR.
Specs says this, linux does this, lets not be different.
>
> ---->
>
> Subject: [PATCH] seabios: fix low bits in ROM and I/O sizing
>
> This cleans up handling of low bits during BAR sizing,
> to match PCI spec requirements, and to use symbolic
> constants from pci_regs.h
>
> Issues fixed:
> For ROM BARs, bit 0 is writeable (enable bit), which we not
> only don't want to set, but it will stick and make us think
> it's an I/O port resource.
> Further, PCI spec defines the following bits as reserved:
> - bit 1 in I/O BAR
> - bits 10:1 in ROM BAR
> and we should be careful and preserve any values there.
> Bits 3:2 in I/O BAR might be writeable, so it
> is wrong to mask them when calculating BAR size.
>
> Spec references:
> See 6.2.5.1 for I/O and memory, and 6.2.5.2 for ROM,
> 6.1 for reserved bit handling;
> pages 225, 228 and 214 in PCI spec revision 3.0.
>
> See also Qemu pcbios commit 6ddb9f5c742b2b82b1755d7ec2a127f6e20e3806
>
> Original-by: Gleb Natapov <address@hidden>
> Signed-off-by: Michael S. Tsirkin <address@hidden>
>
> diff --git a/src/pciinit.c b/src/pciinit.c
> index 7d2ea00..f9ebd61 100644
> --- a/src/pciinit.c
> +++ b/src/pciinit.c
> @@ -136,16 +136,23 @@ static void pci_bios_init_device(u16 bdf)
> /* default memory mappings */
> for (i = 0; i < PCI_NUM_REGIONS; i++) {
> int ofs;
> - u32 val, size;
> -
> + u32 val, mask, size;
> if (i == PCI_ROM_SLOT)
> ofs = PCI_ROM_ADDRESS;
> else
> ofs = PCI_BASE_ADDRESS_0 + i * 4;
> - pci_config_writel(bdf, ofs, 0xffffffff);
> +
> + val = pci_config_readl(bdf, ofs);
> + if (i == PCI_ROM_SLOT)
> + mask = PCI_ROM_ADDRESS_MASK;
> + else if (val & PCI_BASE_ADDRESS_SPACE_IO)
> + mask = PCI_BASE_ADDRESS_IO_MASK;
> + else
> + mask = PCI_BASE_ADDRESS_MEM_MASK;
> + pci_config_writel(bdf, ofs, val | mask);
> val = pci_config_readl(bdf, ofs);
> if (val != 0) {
> - size = (~(val & ~0xf)) + 1;
> + size = (~(val & mask)) + 1;
> if (val & PCI_BASE_ADDRESS_SPACE_IO)
> paddr = &pci_bios_io_addr;
> else if (size >= 0x04000000)
> --
> 1.6.5.rc2
>
--
Gleb.
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., (continued)
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/11
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Gleb Natapov, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Gleb Natapov, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Gleb Natapov, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Gleb Natapov, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR.,
Gleb Natapov <=
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Gleb Natapov, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Gleb Natapov, 2009/10/12
- [Qemu-devel] Re: [PATCH 3/5] Use the correct mask to size the PCI option ROM BAR., Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] seabios: fix low bits in ROM and I/O sizing, Michael S. Tsirkin, 2009/10/12
- [Qemu-devel] Re: seabios: fix low bits in ROM and I/O sizing, Gleb Natapov, 2009/10/13
- Re: [Qemu-devel] Re: seabios: fix low bits in ROM and I/O sizing, Kevin O'Connor, 2009/10/14
[Qemu-devel] [PATCH 4/5] Make MMIO address page aligned in guest., Gleb Natapov, 2009/10/11