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[Qemu-devel] Re: [PATCH v4 05/15] pci/bridge: fix pci_bridge_reset()
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH v4 05/15] pci/bridge: fix pci_bridge_reset() |
Date: |
Mon, 18 Oct 2010 08:22:24 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Oct 18, 2010 at 12:17:46PM +0900, Isaku Yamahata wrote:
> lower 4bits of base/limit register is RO, and
> should not be modified on reset.
>
> Signed-off-by: Isaku Yamahata <address@hidden>
> ---
> hw/pci_bridge.c | 15 +++++++++------
> 1 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/hw/pci_bridge.c b/hw/pci_bridge.c
> index 638e3b3..7229610 100644
> --- a/hw/pci_bridge.c
> +++ b/hw/pci_bridge.c
> @@ -161,12 +161,15 @@ void pci_bridge_reset_reg(PCIDevice *dev)
> conf[PCI_SUBORDINATE_BUS] = 0;
> conf[PCI_SEC_LATENCY_TIMER] = 0;
>
> - conf[PCI_IO_BASE] = 0;
> - conf[PCI_IO_LIMIT] = 0;
> - pci_set_word(conf + PCI_MEMORY_BASE, 0);
> - pci_set_word(conf + PCI_MEMORY_LIMIT, 0);
> - pci_set_word(conf + PCI_PREF_MEMORY_BASE, 0);
> - pci_set_word(conf + PCI_PREF_MEMORY_LIMIT, 0);
> + pci_clear_bit_byte(conf + PCI_IO_BASE, PCI_IO_RANGE_MASK & 0xff);
> + pci_clear_bit_byte(conf + PCI_IO_LIMIT, PCI_IO_RANGE_MASK & 0xff);
No need for & 0xff and & 0xfffff here and below.
also, PCI spec also says that these registers' value
is undefined after reset, so no need to clear them?
If there's a reason, pls put it in comment.
> + pci_clear_bit_word(conf + PCI_MEMORY_BASE, PCI_MEMORY_RANGE_MASK &
> 0xffff);
> + pci_clear_bit_word(conf + PCI_MEMORY_LIMIT,
> + PCI_MEMORY_RANGE_MASK & 0xffff);
> + pci_clear_bit_word(conf + PCI_PREF_MEMORY_BASE,
> + PCI_PREF_RANGE_MASK & 0xffff);
> + pci_clear_bit_word(conf + PCI_PREF_MEMORY_LIMIT,
> + PCI_PREF_RANGE_MASK & 0xffff);
> pci_set_word(conf + PCI_PREF_BASE_UPPER32, 0);
> pci_set_word(conf + PCI_PREF_LIMIT_UPPER32, 0);
>
> --
> 1.7.1.1
- [Qemu-devel] [PATCH v4 10/15] pcie port: define struct PCIEPort/PCIESlot and helper functions, (continued)
- [Qemu-devel] [PATCH v4 10/15] pcie port: define struct PCIEPort/PCIESlot and helper functions, Isaku Yamahata, 2010/10/17
- [Qemu-devel] [PATCH v4 12/15] x3130: pcie upstream port, Isaku Yamahata, 2010/10/17
- [Qemu-devel] [PATCH v4 01/15] pci: make pci_del_capability() update for w1cmask, Isaku Yamahata, 2010/10/17
- [Qemu-devel] [PATCH v4 08/15] pcie: helper functions for pcie capability and extended capability, Isaku Yamahata, 2010/10/17
- [Qemu-devel] [PATCH v4 15/15] pcie/aer: glue aer error injection into qemu monitor, Isaku Yamahata, 2010/10/17
- [Qemu-devel] [PATCH v4 14/15] pcie/hotplug: introduce pushing attention button command, Isaku Yamahata, 2010/10/17
- [Qemu-devel] [PATCH v4 05/15] pci/bridge: fix pci_bridge_reset(), Isaku Yamahata, 2010/10/17
- [Qemu-devel] Re: [PATCH v4 05/15] pci/bridge: fix pci_bridge_reset(),
Michael S. Tsirkin <=
[Qemu-devel] [PATCH v4 02/15] pci: introduce helper functions to clear/set bits in configuration space, Isaku Yamahata, 2010/10/17
[Qemu-devel] [PATCH v4 07/15] pcie: add pcie constants to pcie_regs.h, Isaku Yamahata, 2010/10/17
[Qemu-devel] [PATCH v4 11/15] ioh3420: pcie root port in X58 ioh, Isaku Yamahata, 2010/10/17
[Qemu-devel] [PATCH v4 04/15] pci: record which is written into pci configuration space, Isaku Yamahata, 2010/10/17