* [PATCH V2] acpi: add support for extended IRQ to PCI link
@ 2015-11-12 6:14 Sinan Kaya
2015-11-12 6:14 ` [PATCH] " Sinan Kaya
0 siblings, 1 reply; 7+ messages in thread
From: Sinan Kaya @ 2015-11-12 6:14 UTC (permalink / raw)
To: linux-acpi, timur, cov, jcm; +Cc: Sinan Kaya
The ACPI compiler uses the extended format when used
interrupt numbers are greater than 256. The PCI link code
currently only supports simple interrupt format. The IRQ
numbers are represented using 32 bits when extended IRQ
syntax. This patch changes the interrupt number type to
32 bits and places an upper limit of 1020 as possible
interrupt id.
1020 is the maximum interrupt ID that can be assigned to
an ARM SPI interrupt according to ARM architecture.
Additional checks have been placed to prevent out of bounds
writes.
Changes from V1: (https://lkml.org/lkml/2015/11/8/162)
* change the commit text to include 1020 magic interrupt number
limitation
* cleanup multiple levels of if statements
Sinan Kaya (1):
acpi: add support for extended IRQ to PCI link
drivers/acpi/pci_link.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
--
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH] acpi: add support for extended IRQ to PCI link
2015-11-12 6:14 [PATCH V2] acpi: add support for extended IRQ to PCI link Sinan Kaya
@ 2015-11-12 6:14 ` Sinan Kaya
2015-11-12 9:56 ` Andy Shevchenko
0 siblings, 1 reply; 7+ messages in thread
From: Sinan Kaya @ 2015-11-12 6:14 UTC (permalink / raw)
To: linux-acpi, timur, cov, jcm
Cc: Sinan Kaya, Rafael J. Wysocki, Len Brown, linux-kernel
The ACPI compiler uses the extended format when used
interrupt numbers are greater than 256. The PCI link code
currently only supports simple interrupt format. The IRQ
numbers are represented using 32 bits when extended IRQ
syntax. This patch changes the interrupt number type to
32 bits and places an upper limit of 1020 as possible
interrupt id.
1020 is the maximum interrupt ID that can be assigned to
an ARM SPI interrupt according to ARM architecture.
Additional checks have been placed to prevent out of bounds
writes.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
drivers/acpi/pci_link.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index 7c8408b..a2becab 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -1,6 +1,7 @@
/*
* pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
@@ -67,12 +68,12 @@ static struct acpi_scan_handler pci_link_handler = {
* later even the link is disable. Instead, we just repick the active irq
*/
struct acpi_pci_link_irq {
- u8 active; /* Current IRQ */
+ u32 active; /* Current IRQ */
u8 triggering; /* All IRQs */
u8 polarity; /* All IRQs */
u8 resource_type;
u8 possible_count;
- u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
+ u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
u8 initialized:1;
u8 reserved:7;
};
@@ -437,7 +438,7 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
* enabled system.
*/
-#define ACPI_MAX_IRQS 256
+#define ACPI_MAX_IRQS 1020
#define ACPI_MAX_ISA_IRQ 16
#define PIRQ_PENALTY_PCI_AVAILABLE (0)
@@ -493,7 +494,8 @@ int __init acpi_irq_penalty_init(void)
penalty;
}
- } else if (link->irq.active) {
+ } else if (link->irq.active &&
+ (link->irq.active < ACPI_MAX_IRQS)) {
acpi_irq_penalty[link->irq.active] +=
PIRQ_PENALTY_PCI_POSSIBLE;
}
@@ -541,14 +543,16 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
else
irq = link->irq.possible[link->irq.possible_count - 1];
- if (acpi_irq_balance || !link->irq.active) {
+ if ((acpi_irq_balance || !link->irq.active) && (irq < ACPI_MAX_IRQS)) {
/*
- * Select the best IRQ. This is done in reverse to promote
- * the use of IRQs 9, 10, 11, and >15.
+ * Select the best IRQ. This is done in reverse to
+ * promote the use of IRQs 9, 10, 11, and >15.
*/
- for (i = (link->irq.possible_count - 1); i >= 0; i--) {
- if (acpi_irq_penalty[irq] >
- acpi_irq_penalty[link->irq.possible[i]])
+ i = link->irq.possible_count;
+ while (--i) {
+ if ((link->irq.possible[i] < ACPI_MAX_IRQS) &&
+ (acpi_irq_penalty[irq] >
+ acpi_irq_penalty[link->irq.possible[i]]))
irq = link->irq.possible[i];
}
}
@@ -568,7 +572,9 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
acpi_device_bid(link->device));
return -ENODEV;
} else {
- acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
+ if (link->irq.active < ACPI_MAX_IRQS)
+ acpi_irq_penalty[link->irq.active] +=
+ PIRQ_PENALTY_PCI_USING;
printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
acpi_device_name(link->device),
acpi_device_bid(link->device), link->irq.active);
--
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] acpi: add support for extended IRQ to PCI link
2015-11-12 6:14 ` [PATCH] " Sinan Kaya
@ 2015-11-12 9:56 ` Andy Shevchenko
2015-11-12 15:04 ` Sinan Kaya
0 siblings, 1 reply; 7+ messages in thread
From: Andy Shevchenko @ 2015-11-12 9:56 UTC (permalink / raw)
To: Sinan Kaya
Cc: linux-acpi, Timur Tabi, cov, jcm, Rafael J. Wysocki, Len Brown,
linux-kernel
On Thu, Nov 12, 2015 at 8:14 AM, Sinan Kaya <okaya@codeaurora.org> wrote:
> The ACPI compiler uses the extended format when used
> interrupt numbers are greater than 256. The PCI link code
> currently only supports simple interrupt format. The IRQ
> numbers are represented using 32 bits when extended IRQ
> syntax. This patch changes the interrupt number type to
> 32 bits and places an upper limit of 1020 as possible
> interrupt id.
>
> 1020 is the maximum interrupt ID that can be assigned to
> an ARM SPI interrupt according to ARM architecture.
I think it worth to put these lines in the code as well.
>
> Additional checks have been placed to prevent out of bounds
> writes.
>
> Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
> ---
> drivers/acpi/pci_link.c | 28 +++++++++++++++++-----------
> 1 file changed, 17 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
> index 7c8408b..a2becab 100644
> --- a/drivers/acpi/pci_link.c
> +++ b/drivers/acpi/pci_link.c
> @@ -1,6 +1,7 @@
> /*
> * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
> *
> + * Copyright (c) 2015, The Linux Foundation. All rights reserved.
> * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
> * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
> @@ -67,12 +68,12 @@ static struct acpi_scan_handler pci_link_handler = {
> * later even the link is disable. Instead, we just repick the active irq
> */
> struct acpi_pci_link_irq {
> - u8 active; /* Current IRQ */
> + u32 active; /* Current IRQ */
> u8 triggering; /* All IRQs */
> u8 polarity; /* All IRQs */
> u8 resource_type;
> u8 possible_count;
> - u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
> + u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
> u8 initialized:1;
> u8 reserved:7;
> };
> @@ -437,7 +438,7 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
> * enabled system.
> */
>
> -#define ACPI_MAX_IRQS 256
> +#define ACPI_MAX_IRQS 1020
> #define ACPI_MAX_ISA_IRQ 16
>
> #define PIRQ_PENALTY_PCI_AVAILABLE (0)
> @@ -493,7 +494,8 @@ int __init acpi_irq_penalty_init(void)
> penalty;
> }
>
> - } else if (link->irq.active) {
> + } else if (link->irq.active &&
> + (link->irq.active < ACPI_MAX_IRQS)) {
> acpi_irq_penalty[link->irq.active] +=
> PIRQ_PENALTY_PCI_POSSIBLE;
> }
> @@ -541,14 +543,16 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
> else
> irq = link->irq.possible[link->irq.possible_count - 1];
>
> - if (acpi_irq_balance || !link->irq.active) {
> + if ((acpi_irq_balance || !link->irq.active) && (irq < ACPI_MAX_IRQS)) {
> /*
> - * Select the best IRQ. This is done in reverse to promote
> - * the use of IRQs 9, 10, 11, and >15.
> + * Select the best IRQ. This is done in reverse to
> + * promote the use of IRQs 9, 10, 11, and >15.
What was changed here?
> */
> - for (i = (link->irq.possible_count - 1); i >= 0; i--) {
> - if (acpi_irq_penalty[irq] >
> - acpi_irq_penalty[link->irq.possible[i]])
> + i = link->irq.possible_count;
> + while (--i) {
> + if ((link->irq.possible[i] < ACPI_MAX_IRQS) &&
> + (acpi_irq_penalty[irq] >
> + acpi_irq_penalty[link->irq.possible[i]]))
> irq = link->irq.possible[i];
> }
> }
> @@ -568,7 +572,9 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
> acpi_device_bid(link->device));
> return -ENODEV;
> } else {
> - acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
> + if (link->irq.active < ACPI_MAX_IRQS)
> + acpi_irq_penalty[link->irq.active] +=
> + PIRQ_PENALTY_PCI_USING;
> printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
> acpi_device_name(link->device),
> acpi_device_bid(link->device), link->irq.active);
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] acpi: add support for extended IRQ to PCI link
2015-11-12 9:56 ` Andy Shevchenko
@ 2015-11-12 15:04 ` Sinan Kaya
2015-11-12 15:17 ` Andy Shevchenko
0 siblings, 1 reply; 7+ messages in thread
From: Sinan Kaya @ 2015-11-12 15:04 UTC (permalink / raw)
To: Andy Shevchenko
Cc: linux-acpi, Timur Tabi, cov, jcm, Rafael J. Wysocki, Len Brown,
linux-kernel
On 11/12/2015 4:56 AM, Andy Shevchenko wrote:
> On Thu, Nov 12, 2015 at 8:14 AM, Sinan Kaya <okaya@codeaurora.org> wrote:
>> The ACPI compiler uses the extended format when used
>> interrupt numbers are greater than 256. The PCI link code
>> currently only supports simple interrupt format. The IRQ
>> numbers are represented using 32 bits when extended IRQ
>> syntax. This patch changes the interrupt number type to
>> 32 bits and places an upper limit of 1020 as possible
>> interrupt id.
>>
>> 1020 is the maximum interrupt ID that can be assigned to
>> an ARM SPI interrupt according to ARM architecture.
>
> I think it worth to put these lines in the code as well.
>
ok
>>
>> Additional checks have been placed to prevent out of bounds
>> writes.
>>
>> Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
>> ---
>> drivers/acpi/pci_link.c | 28 +++++++++++++++++-----------
>> 1 file changed, 17 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
>> index 7c8408b..a2becab 100644
>> --- a/drivers/acpi/pci_link.c
>> +++ b/drivers/acpi/pci_link.c
>> @@ -1,6 +1,7 @@
>> /*
>> * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
>> *
>> + * Copyright (c) 2015, The Linux Foundation. All rights reserved.
>> * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
>> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
>> * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
>> @@ -67,12 +68,12 @@ static struct acpi_scan_handler pci_link_handler = {
>> * later even the link is disable. Instead, we just repick the active irq
>> */
>> struct acpi_pci_link_irq {
>> - u8 active; /* Current IRQ */
>> + u32 active; /* Current IRQ */
>> u8 triggering; /* All IRQs */
>> u8 polarity; /* All IRQs */
>> u8 resource_type;
>> u8 possible_count;
>> - u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
>> + u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
>> u8 initialized:1;
>> u8 reserved:7;
>> };
>> @@ -437,7 +438,7 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
>> * enabled system.
>> */
>>
>> -#define ACPI_MAX_IRQS 256
>> +#define ACPI_MAX_IRQS 1020
>> #define ACPI_MAX_ISA_IRQ 16
>>
>> #define PIRQ_PENALTY_PCI_AVAILABLE (0)
>> @@ -493,7 +494,8 @@ int __init acpi_irq_penalty_init(void)
>> penalty;
>> }
>>
>> - } else if (link->irq.active) {
>> + } else if (link->irq.active &&
>> + (link->irq.active < ACPI_MAX_IRQS)) {
>> acpi_irq_penalty[link->irq.active] +=
>> PIRQ_PENALTY_PCI_POSSIBLE;
>> }
>> @@ -541,14 +543,16 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
>> else
>> irq = link->irq.possible[link->irq.possible_count - 1];
>>
>> - if (acpi_irq_balance || !link->irq.active) {
>> + if ((acpi_irq_balance || !link->irq.active) && (irq < ACPI_MAX_IRQS)) {
>> /*
>
>> - * Select the best IRQ. This is done in reverse to promote
>> - * the use of IRQs 9, 10, 11, and >15.
>> + * Select the best IRQ. This is done in reverse to
>> + * promote the use of IRQs 9, 10, 11, and >15.
>
> What was changed here?
See your comments here.
https://lkml.org/lkml/2015/11/8/231
>
>> */
>> - for (i = (link->irq.possible_count - 1); i >= 0; i--) {
>> - if (acpi_irq_penalty[irq] >
>> - acpi_irq_penalty[link->irq.possible[i]])
>> + i = link->irq.possible_count;
>> + while (--i) {
>> + if ((link->irq.possible[i] < ACPI_MAX_IRQS) &&
>> + (acpi_irq_penalty[irq] >
>> + acpi_irq_penalty[link->irq.possible[i]]))
>> irq = link->irq.possible[i];
>> }
>> }
>> @@ -568,7 +572,9 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
>> acpi_device_bid(link->device));
>> return -ENODEV;
>> } else {
>> - acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
>> + if (link->irq.active < ACPI_MAX_IRQS)
>> + acpi_irq_penalty[link->irq.active] +=
>> + PIRQ_PENALTY_PCI_USING;
>> printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
>> acpi_device_name(link->device),
>> acpi_device_bid(link->device), link->irq.active);
>
>
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] acpi: add support for extended IRQ to PCI link
2015-11-12 15:04 ` Sinan Kaya
@ 2015-11-12 15:17 ` Andy Shevchenko
2015-11-12 15:54 ` okaya
0 siblings, 1 reply; 7+ messages in thread
From: Andy Shevchenko @ 2015-11-12 15:17 UTC (permalink / raw)
To: Sinan Kaya
Cc: linux-acpi, Timur Tabi, cov, jcm, Rafael J. Wysocki, Len Brown,
linux-kernel
On Thu, Nov 12, 2015 at 5:04 PM, Sinan Kaya <okaya@codeaurora.org> wrote:
> On 11/12/2015 4:56 AM, Andy Shevchenko wrote:
>> On Thu, Nov 12, 2015 at 8:14 AM, Sinan Kaya <okaya@codeaurora.org> wrote:
>>> - if (acpi_irq_balance || !link->irq.active) {
>>> + if ((acpi_irq_balance || !link->irq.active) && (irq < ACPI_MAX_IRQS)) {
>>> /*
>>
>>> - * Select the best IRQ. This is done in reverse to promote
>>> - * the use of IRQs 9, 10, 11, and >15.
>>> + * Select the best IRQ. This is done in reverse to
>>> + * promote the use of IRQs 9, 10, 11, and >15.
>>
>> What was changed here?
>
> See your comments here.
> https://lkml.org/lkml/2015/11/8/231
So, you refer to narrow commentary blocks, right?
It was about *new* code, leave as is what was before your patch series.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] acpi: add support for extended IRQ to PCI link
2015-11-12 15:17 ` Andy Shevchenko
@ 2015-11-12 15:54 ` okaya
2015-11-12 15:58 ` Timur Tabi
0 siblings, 1 reply; 7+ messages in thread
From: okaya @ 2015-11-12 15:54 UTC (permalink / raw)
To: Andy Shevchenko
Cc: Sinan Kaya, linux-acpi, Timur Tabi, cov, jcm, Rafael J. Wysocki,
Len Brown, linux-kernel
> On Thu, Nov 12, 2015 at 5:04 PM, Sinan Kaya <okaya@codeaurora.org> wrote:
>> On 11/12/2015 4:56 AM, Andy Shevchenko wrote:
>>> On Thu, Nov 12, 2015 at 8:14 AM, Sinan Kaya <okaya@codeaurora.org>
>>> wrote:
>>>> - if (acpi_irq_balance || !link->irq.active) {
>>>> + if ((acpi_irq_balance || !link->irq.active) && (irq <
>>>> ACPI_MAX_IRQS)) {
>>>> /*
>>>
>>>> - * Select the best IRQ. This is done in reverse to
>>>> promote
>>>> - * the use of IRQs 9, 10, 11, and >15.
>>>> + * Select the best IRQ. This is done in reverse to
>>>> + * promote the use of IRQs 9, 10, 11, and >15.
>>>
>>> What was changed here?
>>
>> See your comments here.
>> https://lkml.org/lkml/2015/11/8/231
>
> So, you refer to narrow commentary blocks, right?
> It was about *new* code, leave as is what was before your patch series.
>
> --
> With Best Regards,
> Andy Shevchenko
>
This is what it was before.
> if (acpi_irq_balance || !link->irq.active) {
> - /*
> - * Select the best IRQ. This is done in reverse to promote
> - * the use of IRQs 9, 10, 11, and >15.
> - */
> - for (i = (link->irq.possible_count - 1); i >= 0; i--) {
> - if (acpi_irq_penalty[irq] >
> - acpi_irq_penalty[link->irq.possible[i]])
> - irq = link->irq.possible[i];
I added a range check for link->irq.possible[i] and irq into this code.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] acpi: add support for extended IRQ to PCI link
2015-11-12 15:54 ` okaya
@ 2015-11-12 15:58 ` Timur Tabi
0 siblings, 0 replies; 7+ messages in thread
From: Timur Tabi @ 2015-11-12 15:58 UTC (permalink / raw)
To: okaya, Andy Shevchenko
Cc: linux-acpi, cov, jcm, Rafael J. Wysocki, Len Brown, linux-kernel
okaya@codeaurora.org wrote:
> This is what it was before.
>
>> > if (acpi_irq_balance || !link->irq.active) {
>> >- /*
>> >- * Select the best IRQ. This is done in reverse to promote
>> >- * the use of IRQs 9, 10, 11, and >15.
>> >- */
>> >- for (i = (link->irq.possible_count - 1); i >= 0; i--) {
>> >- if (acpi_irq_penalty[irq] >
>> >- acpi_irq_penalty[link->irq.possible[i]])
>> >- irq = link->irq.possible[i];
> I added a range check for link->irq.possible[i] and irq into this code.
>
>
This change:
- * Select the best IRQ. This is done in reverse to promote
- * the use of IRQs 9, 10, 11, and >15.
+ * Select the best IRQ. This is done in reverse to
+ * promote the use of IRQs 9, 10, 11, and >15.
is an unrelated whitespace change. It doesn't belong in this patch.
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, hosted by The Linux Foundation.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2015-11-12 15:58 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2015-11-12 6:14 [PATCH V2] acpi: add support for extended IRQ to PCI link Sinan Kaya
2015-11-12 6:14 ` [PATCH] " Sinan Kaya
2015-11-12 9:56 ` Andy Shevchenko
2015-11-12 15:04 ` Sinan Kaya
2015-11-12 15:17 ` Andy Shevchenko
2015-11-12 15:54 ` okaya
2015-11-12 15:58 ` Timur Tabi
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