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ACPI: PCI: Replace direct printk() invocations in pci_link.c
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Replace the direct printk() invocations in pci_link.c with (mostly
corresponding) acpi_handle_*() calls relative to the ACPI handle of
the given link device, which allows the AML corresponding to those
messages to be identified more easily, or with pr_*() calls.

While at it, add a pr_fmt() definition ot pci_link.c, make
acpi_pci_link_check_possible() print all messages with
acpi_handle_debug() for consistency and replace the (not-so-
reliable) KERN_CONT-based message line composition in
acpi_pci_link_add() with two pr_info() and a series of
acpi_handle_debug() calls (the latter for the possible IRQs).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
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Rafael J. Wysocki committed Mar 8, 2021
1 parent 866d6cd commit de972fd
Showing 1 changed file with 38 additions and 48 deletions.
86 changes: 38 additions & 48 deletions drivers/acpi/pci_link.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,8 @@
* for IRQ management (e.g. start()->_SRS).
*/

#define pr_fmt(fmt) "ACPI: PCI: " fmt

#include <linux/syscore_ops.h>
#include <linux/kernel.h>
#include <linux/module.h>
Expand Down Expand Up @@ -102,9 +104,9 @@ static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
(i < p->interrupt_count
&& i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
if (!p->interrupts[i]) {
printk(KERN_WARNING PREFIX
"Invalid _PRS IRQ %d\n",
p->interrupts[i]);
acpi_handle_debug(handle,
"Invalid _PRS IRQ %d\n",
p->interrupts[i]);
continue;
}
link->irq.possible[i] = p->interrupts[i];
Expand All @@ -120,17 +122,17 @@ static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
struct acpi_resource_extended_irq *p =
&resource->data.extended_irq;
if (!p || !p->interrupt_count) {
printk(KERN_WARNING PREFIX
"Blank _PRS EXT IRQ resource\n");
acpi_handle_debug(handle,
"Blank _PRS EXT IRQ resource\n");
return AE_OK;
}
for (i = 0;
(i < p->interrupt_count
&& i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
if (!p->interrupts[i]) {
printk(KERN_WARNING PREFIX
"Invalid _PRS IRQ %d\n",
p->interrupts[i]);
acpi_handle_debug(handle,
"Invalid _PRS IRQ %d\n",
p->interrupts[i]);
continue;
}
link->irq.possible[i] = p->interrupts[i];
Expand All @@ -142,8 +144,8 @@ static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
break;
}
default:
printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
resource->type);
acpi_handle_debug(handle, "_PRS resource type 0x%x is not IRQ\n",
resource->type);
return AE_OK;
}

Expand Down Expand Up @@ -527,6 +529,7 @@ static int acpi_irq_balance = -1; /* 0: static, 1: balance */

static int acpi_pci_link_allocate(struct acpi_pci_link *link)
{
acpi_handle handle = link->device->handle;
int irq;
int i;

Expand All @@ -549,8 +552,8 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
*/
if (i == link->irq.possible_count) {
if (acpi_strict)
printk(KERN_WARNING PREFIX "_CRS %d not found"
" in _PRS\n", link->irq.active);
acpi_handle_warn(handle, "_CRS %d not found in _PRS\n",
link->irq.active);
link->irq.active = 0;
}

Expand All @@ -574,28 +577,23 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
}
}
if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) {
printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. "
"Try pci=noacpi or acpi=off\n",
acpi_device_name(link->device),
acpi_device_bid(link->device));
acpi_handle_err(handle,
"No IRQ available. Try pci=noacpi or acpi=off\n");
return -ENODEV;
}

/* Attempt to enable the link device at this IRQ. */
if (acpi_pci_link_set(link, irq)) {
printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
"Try pci=noacpi or acpi=off\n",
acpi_device_name(link->device),
acpi_device_bid(link->device));
acpi_handle_err(handle,
"Unable to set IRQ. Try pci=noacpi or acpi=off\n");
return -ENODEV;
} else {
if (link->irq.active < ACPI_MAX_ISA_IRQS)
acpi_isa_irq_penalty[link->irq.active] +=
PIRQ_PENALTY_PCI_USING;

pr_info("%s [%s] enabled at IRQ %d\n",
acpi_device_name(link->device),
acpi_device_bid(link->device), link->irq.active);
acpi_handle_info(handle, "Enabled at IRQ %d\n",
link->irq.active);
}

link->irq.initialized = 1;
Expand All @@ -616,19 +614,19 @@ int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,

result = acpi_bus_get_device(handle, &device);
if (result) {
printk(KERN_ERR PREFIX "Invalid link device\n");
acpi_handle_err(handle, "Invalid link device\n");
return -1;
}

link = acpi_driver_data(device);
if (!link) {
printk(KERN_ERR PREFIX "Invalid link context\n");
acpi_handle_err(handle, "Invalid link context\n");
return -1;
}

/* TBD: Support multiple index (IRQ) entries per Link Device */
if (index) {
printk(KERN_ERR PREFIX "Invalid index %d\n", index);
acpi_handle_err(handle, "Invalid index %d\n", index);
return -1;
}

Expand All @@ -640,7 +638,7 @@ int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,

if (!link->irq.active) {
mutex_unlock(&acpi_link_lock);
printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
acpi_handle_err(handle, "Link active IRQ is 0!\n");
return -1;
}
link->refcnt++;
Expand Down Expand Up @@ -668,20 +666,20 @@ int acpi_pci_link_free_irq(acpi_handle handle)

result = acpi_bus_get_device(handle, &device);
if (result) {
printk(KERN_ERR PREFIX "Invalid link device\n");
acpi_handle_err(handle, "Invalid link device\n");
return -1;
}

link = acpi_driver_data(device);
if (!link) {
printk(KERN_ERR PREFIX "Invalid link context\n");
acpi_handle_err(handle, "Invalid link context\n");
return -1;
}

mutex_lock(&acpi_link_lock);
if (!link->irq.initialized) {
mutex_unlock(&acpi_link_lock);
printk(KERN_ERR PREFIX "Link isn't initialized\n");
acpi_handle_err(handle, "Link isn't initialized\n");
return -1;
}
#ifdef FUTURE_USE
Expand Down Expand Up @@ -712,10 +710,10 @@ int acpi_pci_link_free_irq(acpi_handle handle)
static int acpi_pci_link_add(struct acpi_device *device,
const struct acpi_device_id *not_used)
{
int result;
acpi_handle handle = device->handle;
struct acpi_pci_link *link;
int result;
int i;
int found = 0;

link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
if (!link)
Expand All @@ -734,31 +732,23 @@ static int acpi_pci_link_add(struct acpi_device *device,
/* query and set link->irq.active */
acpi_pci_link_get_current(link);

printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
acpi_device_bid(device));
pr_info("Interrupt link %s configured for IRQ %d\n",
acpi_device_bid(device), link->irq.active);

for (i = 0; i < link->irq.possible_count; i++) {
if (link->irq.active == link->irq.possible[i]) {
printk(KERN_CONT " *%d", link->irq.possible[i]);
found = 1;
} else
printk(KERN_CONT " %d", link->irq.possible[i]);
if (link->irq.active != link->irq.possible[i])
acpi_handle_debug(handle, "Possible IRQ %d\n",
link->irq.possible[i]);
}

printk(KERN_CONT ")");

if (!found)
printk(KERN_CONT " *%d", link->irq.active);

if (!link->device->status.enabled)
printk(KERN_CONT ", disabled.");

printk(KERN_CONT "\n");
pr_info("Interrupt link %s disabled\n", acpi_device_bid(device));

list_add_tail(&link->list, &acpi_link_list);

end:
/* disable all links -- to be activated on use */
acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
acpi_evaluate_object(handle, "_DIS", NULL, NULL);
mutex_unlock(&acpi_link_lock);

if (result)
Expand Down

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