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SubjectRe: [PATCH 1/2, pci] pci: Addition of PCI_DEV_FLAGS_QUIET_PCI_REALIGN attribute to the PCI subsystem
On Wed, Mar 14, 2018 at 01:34:54PM -0300, Desnes A. Nunes do Rosario wrote:
> Add PCI_DEV_FLAGS_QUIET_PCI_REALIGN to pci_dev_flags and use it to
> silent PCI realignment messages if the flag is turned on by a driver.
>
> Signed-off-by: Desnes A. Nunes do Rosario <desnesn@linux.vnet.ibm.com>
> ---
> drivers/pci/pci.c | 3 ++-
> drivers/pci/setup-res.c | 3 ++-
> include/linux/pci.h | 2 ++
> 3 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 8c71d1a66cdd..be197c944e5f 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -5505,7 +5505,8 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
> return;
> }
>
> - pci_info(dev, "Disabling memory decoding and releasing memory resources\n");
> + if (!(dev->dev_flags & PCI_DEV_FLAGS_QUIET_PCI_REALIGN))
> + pci_info(dev, "Disabling memory decoding and releasing memory resources\n");
> pci_read_config_word(dev, PCI_COMMAND, &command);
> command &= ~PCI_COMMAND_MEMORY;
> pci_write_config_word(dev, PCI_COMMAND, command);
> diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
> index 369d48d6c6f1..00a538def763 100644
> --- a/drivers/pci/setup-res.c
> +++ b/drivers/pci/setup-res.c
> @@ -172,7 +172,8 @@ EXPORT_SYMBOL(pci_claim_resource);
>
> void pci_disable_bridge_window(struct pci_dev *dev)
> {
> - pci_info(dev, "disabling bridge mem windows\n");
> + if (!(dev->dev_flags & PCI_DEV_FLAGS_QUIET_PCI_REALIGN))
> + pci_info(dev, "disabling bridge mem windows\n");

As far as I'm concerned, we can just remove these messages completely.
I don't think there's any real value there.

> /* MMIO Base/Limit */
> pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index e057e8cc63e7..993f9c7dcc00 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -205,6 +205,8 @@ enum pci_dev_flags {
> PCI_DEV_FLAGS_NO_FLR_RESET = (__force pci_dev_flags_t) (1 << 10),
> /* Don't use Relaxed Ordering for TLPs directed at this device */
> PCI_DEV_FLAGS_NO_RELAXED_ORDERING = (__force pci_dev_flags_t) (1 << 11),
> + /* Silent PCI resource realignment messages */
> + PCI_DEV_FLAGS_QUIET_PCI_REALIGN = (__force pci_dev_flags_t) (1 << 12),
> };
>
> enum pci_irq_reroute_variant {
> --
> 2.14.3
>

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