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Date: Mon, 14 Mar 2016 13:52:51 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Sinan Kaya <okaya@...eaurora.org>
Cc: linux-acpi@...r.kernel.org, timur@...eaurora.org,
cov@...eaurora.org, linux-pci@...r.kernel.org,
ravikanth.nalla@....com, lenb@...nel.org, harish.k@....com,
ashwin.reghunandanan@....com, bhelgaas@...gle.com,
rjw@...ysocki.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] acpi,pci,irq: reduce resource requirements
On Tue, Mar 08, 2016 at 07:41:16PM -0500, Sinan Kaya wrote:
> Code has been redesigned to calculate penalty requirements on the fly. This
> significantly simplifies the implementation and removes some of the init
> calls from x86 architecture.
>
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
> ---
> drivers/acpi/pci_link.c | 82 ++++++++++++++++++++++++++++++++++---------------
> 1 file changed, 58 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
> index ededa90..a5a66ca 100644
> --- a/drivers/acpi/pci_link.c
> +++ b/drivers/acpi/pci_link.c
> @@ -36,6 +36,8 @@
> #include <linux/mutex.h>
> #include <linux/slab.h>
> #include <linux/acpi.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
>
> #include "internal.h"
>
> @@ -440,7 +442,6 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
> #define ACPI_MAX_IRQS 256
> #define ACPI_MAX_ISA_IRQ 16
>
> -#define PIRQ_PENALTY_PCI_AVAILABLE (0)
> #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
> #define PIRQ_PENALTY_PCI_USING (16*16*16)
> #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
> @@ -457,9 +458,9 @@ static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
> PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
> PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
> PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
> - PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
> - PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
> - PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
> + 0, /* IRQ9 PCI, often acpi */
> + 0, /* IRQ10 PCI */
> + 0, /* IRQ11 PCI */
> PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
> PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
> PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
> @@ -467,6 +468,49 @@ static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
> /* >IRQ15 */
> };
>
> +static int acpi_irq_pci_sharing_penalty(int irq)
> +{
> + struct acpi_pci_link *link;
> + int penalty = 0;
> +
> + list_for_each_entry(link, &acpi_link_list, list) {
> + /*
> + * If a link is active, penalize its IRQ heavily
> + * so we try to choose a different IRQ.
> + */
> + if (link->irq.active && link->irq.active == irq)
> + penalty += PIRQ_PENALTY_PCI_USING;
> + else {
> + int i;
> +
> + /*
> + * If a link is inactive, penalize the IRQs it
> + * might use, but not as severely.
> + */
> + for (i = 0; i < link->irq.possible_count; i++)
> + if (link->irq.possible[i] == irq)
> + penalty += PIRQ_PENALTY_PCI_POSSIBLE /
> + link->irq.possible_count;
> + }
> + }
> +
> + return penalty;
> +}
> +
> +static int acpi_irq_get_penalty(int irq)
> +{
> + int penalty = 0;
> +
> + if (irq < ACPI_MAX_ISA_IRQ)
> + penalty += acpi_irq_penalty[irq];
> +
> + if (irq == acpi_gbl_FADT.sci_interrupt)
> + penalty += PIRQ_PENALTY_PCI_USING;
> +
> + penalty += acpi_irq_pci_sharing_penalty(irq);
> + return penalty;
> +}
> +
> int __init acpi_irq_penalty_init(void)
> {
> struct acpi_pci_link *link;
> @@ -568,7 +612,6 @@ 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;
> printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
> acpi_device_name(link->device),
> acpi_device_bid(link->device), link->irq.active);
> @@ -787,23 +830,24 @@ static int __init acpi_irq_penalty_update(char *str, int used)
> for (i = 0; i < 16; i++) {
> int retval;
> int irq;
> + int new_penalty;
>
> retval = get_option(&str, &irq);
>
> if (!retval)
> break; /* no number found */
>
> - if (irq < 0)
> - continue;
> -
> - if (irq >= ARRAY_SIZE(acpi_irq_penalty))
> + /* see if this is a ISA IRQ */
> + if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQ))
> continue;
>
> if (used)
> - acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
> + new_penalty = acpi_irq_get_penalty(irq) +
> + PIRQ_PENALTY_ISA_USED;
> else
> - acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
> + new_penalty = 0;
>
> + acpi_irq_penalty[irq] = new_penalty;
> if (retval != 2) /* no next number */
> break;
> }
> @@ -819,12 +863,9 @@ static int __init acpi_irq_penalty_update(char *str, int used)
> */
> void acpi_penalize_isa_irq(int irq, int active)
> {
> - if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
> - if (active)
> - acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
> - else
> - acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
> - }
> + if ((irq >= 0) && (irq < ARRAY_SIZE(acpi_irq_penalty)))
> + acpi_irq_penalty[irq] = active ?
> + PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING;
> }
>
> bool acpi_isa_irq_available(int irq)
> @@ -840,13 +881,6 @@ bool acpi_isa_irq_available(int irq)
> */
> void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
> {
> - if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
> - if (trigger != ACPI_MADT_TRIGGER_LEVEL ||
> - polarity != ACPI_MADT_POLARITY_ACTIVE_LOW)
> - acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_ALWAYS;
> - else
> - acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
> - }
I think we lost the validation of trigger mode and polarity, didn't
we?
> }
>
> /*
> --
> 1.8.2.1
>
> --
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