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Date: Thu, 30 May 2013 21:51:51 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Jiang Liu <liuj97@...il.com>, Yinghai Lu <yinghai@...nel.org>,
Jiang Liu <jiang.liu@...wei.com>,
Gu Zheng <guz.fnst@...fujitsu.com>,
Toshi Kani <toshi.kani@...com>,
Myron Stowe <myron.stowe@...hat.com>,
Yijing Wang <wangyijing@...wei.com>, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>,
linux-acpi@...r.kernel.org
Subject: Re: [PATCH v1 2/2] ACPI, pci_root: use acpi_handle_print() and pr_xxx() to print messages
On Thursday, May 30, 2013 11:33:56 AM Bjorn Helgaas wrote:
> On Tue, May 14, 2013 at 09:00:39PM +0800, Jiang Liu wrote:
> > Use acpi_handle_print() and pr_xxx() to print messages in pci_root.c.
> >
> > Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> > Cc: Len Brown <lenb@...nel.org>
> > Cc: "Rafael J. Wysocki" <rjw@...k.pl>
> > Cc: linux-acpi@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > ---
> > drivers/acpi/pci_root.c | 70 ++++++++++++++++++++++---------------------------
> > 1 file changed, 32 insertions(+), 38 deletions(-)
> >
> > diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> > index 91ddfd6..21dda5a 100644
> > --- a/drivers/acpi/pci_root.c
> > +++ b/drivers/acpi/pci_root.c
> > @@ -379,23 +379,24 @@ static int acpi_pci_root_add(struct acpi_device *device,
> > struct acpi_pci_root *root;
> > u32 flags, base_flags;
> > bool is_osc_granted = false;
> > + acpi_handle handle = device->handle;
> >
> > root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
> > if (!root)
> > return -ENOMEM;
> >
> > segment = 0;
> > - status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
> > + status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
> > &segment);
> > if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> > - printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
> > + acpi_handle_err(handle, "can't evaluate _SEG\n");
>
> I previously acked this, but I noticed that we are making a mix of
> dev_printk() and acpi_handle_printk() here. The difference is like this:
>
> acpi PNP0A08:00: ACPI _OSC support notification failed, disabling PCIe ASPM
> ACPI: \_SB_.PCI0: ACPI _OSC support notification failed, disabling PCIe ASPM
>
> I'm not sure which direction we should go here, but I think we should
> choose one or the other and use it consistently. Personally, I think the
> internal DSDT names should be available *somewhere*, but not necessarily
> used in run-of-the-mill chit-chat. For that reason, I prefer
> dev_printk(), though I have the feeling that Rafael is moving toward
> eliminating the struct acpi_device, so he might prefer
> acpi_handle_printk().
I really don't care that much, but I agree that they should be used
consistently.
Thanks,
Rafael
> > result = -ENODEV;
> > goto end;
> > }
> >
> > /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
> > root->secondary.flags = IORESOURCE_BUS;
> > - status = try_get_root_bridge_busnr(device->handle, &root->secondary);
> > + status = try_get_root_bridge_busnr(handle, &root->secondary);
> > if (ACPI_FAILURE(status)) {
> > /*
> > * We need both the start and end of the downstream bus range
> > @@ -404,16 +405,16 @@ static int acpi_pci_root_add(struct acpi_device *device,
> > * can do is assume [_BBN-0xFF] or [0-0xFF].
> > */
> > root->secondary.end = 0xFF;
> > - printk(KERN_WARNING FW_BUG PREFIX
> > - "no secondary bus range in _CRS\n");
> > - status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
> > + acpi_handle_warn(handle,
> > + FW_BUG "no secondary bus range in _CRS\n");
> > + status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
> > NULL, &bus);
> > if (ACPI_SUCCESS(status))
> > root->secondary.start = bus;
> > else if (status == AE_NOT_FOUND)
> > root->secondary.start = 0;
> > else {
> > - printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
> > + acpi_handle_err(handle, "can't evaluate _BBN\n");
> > result = -ENODEV;
> > goto end;
> > }
> > @@ -425,11 +426,11 @@ static int acpi_pci_root_add(struct acpi_device *device,
> > strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
> > device->driver_data = root;
> >
> > - printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
> > + pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
> > acpi_device_name(device), acpi_device_bid(device),
> > root->segment, &root->secondary);
> >
> > - root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
> > + root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
> >
> > /*
> > * All supported architectures that use ACPI have support for
> > @@ -473,7 +474,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
> > dev_info(&device->dev,
> > "Requesting ACPI _OSC control (0x%02x)\n", flags);
> >
> > - status = acpi_pci_osc_control_set(device->handle, &flags,
> > + status = acpi_pci_osc_control_set(handle, &flags,
> > OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
> > if (ACPI_SUCCESS(status)) {
> > is_osc_granted = true;
> > @@ -505,9 +506,9 @@ static int acpi_pci_root_add(struct acpi_device *device,
> > */
> > root->bus = pci_acpi_scan_root(root);
> > if (!root->bus) {
> > - printk(KERN_ERR PREFIX
> > - "Bus %04x:%02x not present in PCI namespace\n",
> > - root->segment, (unsigned int)root->secondary.start);
> > + acpi_handle_err(handle,
> > + "Bus %04x:%02x not present in PCI namespace\n",
> > + root->segment, (unsigned int)root->secondary.start);
> > result = -ENODEV;
> > goto end;
> > }
> > @@ -517,8 +518,8 @@ static int acpi_pci_root_add(struct acpi_device *device,
> > if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM)
> > pcie_clear_aspm(root->bus);
> > } else {
> > - pr_info("ACPI _OSC control for PCIe not granted, "
> > - "disabling ASPM\n");
> > + acpi_handle_info(handle,
> > + "ACPI _OSC control for PCIe not granted, disabling ASPM\n");
> > pcie_no_aspm();
> > }
> >
> > @@ -571,12 +572,13 @@ static void handle_root_bridge_insertion(acpi_handle handle)
> > struct acpi_device *device;
> >
> > if (!acpi_bus_get_device(handle, &device)) {
> > - printk(KERN_DEBUG "acpi device exists...\n");
> > + acpi_handle_printk(KERN_DEBUG, handle,
> > + "acpi device exists...\n");
> > return;
> > }
> >
> > if (acpi_bus_scan(handle))
> > - printk(KERN_ERR "cannot add bridge to acpi list\n");
> > + acpi_handle_err(handle, "cannot add bridge to acpi list\n");
> > }
> >
> > static void handle_root_bridge_removal(struct acpi_device *device)
> > @@ -602,7 +604,6 @@ static void handle_root_bridge_removal(struct acpi_device *device)
> > static void _handle_hotplug_event_root(struct work_struct *work)
> > {
> > struct acpi_pci_root *root;
> > - struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER };
> > struct acpi_hp_work *hp_work;
> > acpi_handle handle;
> > u32 type;
> > @@ -613,13 +614,11 @@ static void _handle_hotplug_event_root(struct work_struct *work)
> >
> > root = acpi_pci_find_root(handle);
> >
> > - acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
> > -
> > switch (type) {
> > case ACPI_NOTIFY_BUS_CHECK:
> > /* bus enumerate */
> > - printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__,
> > - (char *)buffer.pointer);
> > + acpi_handle_printk(KERN_DEBUG, handle,
> > + "Bus check notify on %s\n", __func__);
> > if (!root)
> > handle_root_bridge_insertion(handle);
> >
> > @@ -627,27 +626,26 @@ static void _handle_hotplug_event_root(struct work_struct *work)
> >
> > case ACPI_NOTIFY_DEVICE_CHECK:
> > /* device check */
> > - printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__,
> > - (char *)buffer.pointer);
> > + acpi_handle_printk(KERN_DEBUG, handle,
> > + "Device check notify on %s\n", __func__);
> > if (!root)
> > handle_root_bridge_insertion(handle);
> > break;
> >
> > case ACPI_NOTIFY_EJECT_REQUEST:
> > /* request device eject */
> > - printk(KERN_DEBUG "%s: Device eject notify on %s\n", __func__,
> > - (char *)buffer.pointer);
> > + acpi_handle_printk(KERN_DEBUG, handle,
> > + "Device eject notify on %s\n", __func__);
> > if (root)
> > handle_root_bridge_removal(root->device);
> > break;
> > default:
> > - printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n",
> > - type, (char *)buffer.pointer);
> > + acpi_handle_warn(handle,
> > + "notify_handler: unknown event type 0x%x\n", type);
> > break;
> > }
> >
> > kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
> > - kfree(buffer.pointer);
> > }
> >
> > static void handle_hotplug_event_root(acpi_handle handle, u32 type,
> > @@ -661,9 +659,6 @@ static acpi_status __init
> > find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
> > {
> > acpi_status status;
> > - char objname[64];
> > - struct acpi_buffer buffer = { .length = sizeof(objname),
> > - .pointer = objname };
> > int *count = (int *)context;
> >
> > if (!acpi_is_root_bridge(handle))
> > @@ -671,16 +666,15 @@ find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
> >
> > (*count)++;
> >
> > - acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
> > -
> > status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> > handle_hotplug_event_root, NULL);
> > if (ACPI_FAILURE(status))
> > - printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n",
> > - objname, (unsigned int)status);
> > + acpi_handle_printk(KERN_DEBUG, handle,
> > + "notify handler is not installed, exit status: %u\n",
> > + (unsigned int)status);
> > else
> > - printk(KERN_DEBUG "acpi root: %s notify handler is installed\n",
> > - objname);
> > + acpi_handle_printk(KERN_DEBUG, handle,
> > + "notify handler is installed\n");
> >
> > return AE_OK;
> > }
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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