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gpio: Remove dynamic allocation from populate_parent_alloc_arg() 

The gpiolib is unique in the way it uses intermediate fwspecs
when feeding an interrupt specifier to the parent domain, as it
relies on the populate_parent_alloc_arg() callback to perform
a dynamic allocation.

This is pretty inefficient (we free the structure almost immediately),
and the only reason this isn't a stack allocation is that our
ThunderX friend uses MSIs rather than a FW-constructed structure.

Let's solve it by providing a new type composed of the union
of a struct irq_fwspec and a msi_info_t, which satisfies both
requirements. This allows us to use a stack allocation, and we
can move the handful of users to this new scheme.

Also perform some additional cleanup, such as getting rid of the
stub versions of the irq_domain_translate_*cell helpers, which
are never used when CONFIG_IRQ_DOMAIN_HIERARCHY isn't selected.

Tested on a Tegra186.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: Daniel Palmer <daniel@thingy.jp>
Cc: Romain Perier <romain.perier@gmail.com>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Robert Richter <rric@kernel.org>
Cc: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Bartosz Golaszewski <brgl@bgdev.pl>
Link: https://lore.kernel.org/r/20220707182314.66610-2-prabhakar.mahadev-lad.rj@bp.renesas.com
This commit is contained in:
Marc Zyngier 2022-07-07 19:23:09 +01:00
parent a111daf0c5
commit 91a29af413
8 changed files with 73 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpio/gpio-msc313.c
View File

@ -550,15 +550,12 @@ static struct irq_chip msc313_gpio_irqchip = {
* so we need to provide the fwspec. Essentially gpiochip_populate_parent_fwspec_twocell
* that puts GIC_SPI into the first cell.
*/
static void *msc313_gpio_populate_parent_fwspec(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type)
static int msc313_gpio_populate_parent_fwspec(struct gpio_chip *gc,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = gc->irq.parent_domain->fwnode;
fwspec->param_count = 3;
@ -566,7 +563,7 @@ static void *msc313_gpio_populate_parent_fwspec(struct gpio_chip *gc,
fwspec->param[1] = parent_hwirq;
fwspec->param[2] = parent_type;
return fwspec;
return 0;
}
static int msc313e_gpio_child_to_parent_hwirq(struct gpio_chip *chip,

15
drivers/gpio/gpio-tegra.c
View File

@ -443,15 +443,12 @@ static int tegra_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
return 0;
}
static void *tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip,
unsigned int parent_hwirq,
unsigned int parent_type)
static int tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = chip->irq.parent_domain->fwnode;
fwspec->param_count = 3;
@ -459,7 +456,7 @@ static void *tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip,
fwspec->param[1] = parent_hwirq;
fwspec->param[2] = parent_type;
return fwspec;
return 0;
}
#ifdef CONFIG_PM_SLEEP

15
drivers/gpio/gpio-tegra186.c
View File

@ -621,16 +621,13 @@ static int tegra186_gpio_irq_domain_translate(struct irq_domain *domain,
return 0;
}
static void *tegra186_gpio_populate_parent_fwspec(struct gpio_chip *chip,
unsigned int parent_hwirq,
unsigned int parent_type)
static int tegra186_gpio_populate_parent_fwspec(struct gpio_chip *chip,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct tegra_gpio *gpio = gpiochip_get_data(chip);
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = chip->irq.parent_domain->fwnode;
fwspec->param_count = 3;
@ -638,7 +635,7 @@ static void *tegra186_gpio_populate_parent_fwspec(struct gpio_chip *chip,
fwspec->param[1] = parent_hwirq;
fwspec->param[2] = parent_type;
return fwspec;
return 0;
}
static int tegra186_gpio_child_to_parent_hwirq(struct gpio_chip *chip,

15
drivers/gpio/gpio-thunderx.c
View File

@ -408,18 +408,15 @@ static int thunderx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
return 0;
}
static void *thunderx_gpio_populate_parent_alloc_info(struct gpio_chip *chip,
unsigned int parent_hwirq,
unsigned int parent_type)
static int thunderx_gpio_populate_parent_alloc_info(struct gpio_chip *chip,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
msi_alloc_info_t *info;
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return NULL;
msi_alloc_info_t *info = &gfwspec->msiinfo;
info->hwirq = parent_hwirq;
return info;
return 0;
}
static int thunderx_gpio_probe(struct pci_dev *pdev,

15
drivers/gpio/gpio-visconti.c
View File

@ -103,15 +103,12 @@ static int visconti_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
return -EINVAL;
}
static void *visconti_gpio_populate_parent_fwspec(struct gpio_chip *chip,
unsigned int parent_hwirq,
unsigned int parent_type)
static int visconti_gpio_populate_parent_fwspec(struct gpio_chip *chip,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = chip->irq.parent_domain->fwnode;
fwspec->param_count = 3;
@ -119,7 +116,7 @@ static void *visconti_gpio_populate_parent_fwspec(struct gpio_chip *chip,
fwspec->param[1] = parent_hwirq;
fwspec->param[2] = parent_type;
return fwspec;
return 0;
}
static int visconti_gpio_probe(struct platform_device *pdev)

42
drivers/gpio/gpiolib.c
View File

@ -1107,7 +1107,7 @@ static int gpiochip_hierarchy_irq_domain_alloc(struct irq_domain *d,
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
struct irq_fwspec *fwspec = data;
void *parent_arg;
union gpio_irq_fwspec gpio_parent_fwspec = {};
unsigned int parent_hwirq;
unsigned int parent_type;
struct gpio_irq_chip *girq = &gc->irq;
@ -1147,14 +1147,15 @@ static int gpiochip_hierarchy_irq_domain_alloc(struct irq_domain *d,
irq_set_probe(irq);
/* This parent only handles asserted level IRQs */
parent_arg = girq->populate_parent_alloc_arg(gc, parent_hwirq, parent_type);
if (!parent_arg)
return -ENOMEM;
ret = girq->populate_parent_alloc_arg(gc, &gpio_parent_fwspec,
parent_hwirq, parent_type);
if (ret)
return ret;
chip_dbg(gc, "alloc_irqs_parent for %d parent hwirq %d\n",
irq, parent_hwirq);
irq_set_lockdep_class(irq, gc->irq.lock_key, gc->irq.request_key);
ret = irq_domain_alloc_irqs_parent(d, irq, 1, parent_arg);
ret = irq_domain_alloc_irqs_parent(d, irq, 1, &gpio_parent_fwspec);
/*
* If the parent irqdomain is msi, the interrupts have already
* been allocated, so the EEXIST is good.
@ -1166,7 +1167,6 @@ static int gpiochip_hierarchy_irq_domain_alloc(struct irq_domain *d,
"failed to allocate parent hwirq %d for hwirq %lu\n",
parent_hwirq, hwirq);
kfree(parent_arg);
return ret;
}
@ -1230,34 +1230,28 @@ static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc)
return !!gc->irq.parent_domain;
}
void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type)
int gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = gc->irq.parent_domain->fwnode;
fwspec->param_count = 2;
fwspec->param[0] = parent_hwirq;
fwspec->param[1] = parent_type;
return fwspec;
return 0;
}
EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_twocell);
void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type)
int gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = gc->irq.parent_domain->fwnode;
fwspec->param_count = 4;
@ -1266,7 +1260,7 @@ void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
fwspec->param[2] = 0;
fwspec->param[3] = parent_type;
return fwspec;
return 0;
}
EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_fourcell);

15
drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
View File

@ -966,16 +966,13 @@ static int pmic_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
return 0;
}
static void *pmic_gpio_populate_parent_fwspec(struct gpio_chip *chip,
unsigned int parent_hwirq,
unsigned int parent_type)
static int pmic_gpio_populate_parent_fwspec(struct gpio_chip *chip,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct pmic_gpio_state *state = gpiochip_get_data(chip);
struct irq_fwspec *fwspec;
fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = chip->irq.parent_domain->fwnode;
@ -985,7 +982,7 @@ static void *pmic_gpio_populate_parent_fwspec(struct gpio_chip *chip,
/* param[2] must be left as 0 */
fwspec->param[3] = parent_type;
return fwspec;
return 0;
}
static int pmic_gpio_probe(struct platform_device *pdev)

42
include/linux/gpio/driver.h
View File

@ -12,6 +12,8 @@
#include <linux/property.h>
#include <linux/types.h>
#include <asm/msi.h>
struct gpio_desc;
struct of_phandle_args;
struct device_node;
@ -23,6 +25,13 @@ enum gpio_lookup_flags;
struct gpio_chip;
union gpio_irq_fwspec {
struct irq_fwspec fwspec;
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
msi_alloc_info_t msiinfo;
#endif
};
#define GPIO_LINE_DIRECTION_IN 1
#define GPIO_LINE_DIRECTION_OUT 0
@ -103,9 +112,10 @@ struct gpio_irq_chip {
* variant named &gpiochip_populate_parent_fwspec_fourcell is also
* available.
*/
void *(*populate_parent_alloc_arg)(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type);
int (*populate_parent_alloc_arg)(struct gpio_chip *gc,
union gpio_irq_fwspec *fwspec,
unsigned int parent_hwirq,
unsigned int parent_type);
/**
* @child_offset_to_irq:
@ -646,28 +656,14 @@ struct bgpio_pdata {
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
int gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type);
int gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type);
void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type);
#else
static inline void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type)
{
return NULL;
}
static inline void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
unsigned int parent_hwirq,
unsigned int parent_type)
{
return NULL;
}
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */