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irqchip/gic-v3: Make gic_enable_sre an inline function 

In order for gic_enable_sre to be used by the arm64 core code,
move it to arm-gic-v3.h. As a bonus, we now also check if
system registers have been already enabled, and return early
if they have.

In all cases, the function now returns a boolean indicating if
the enabling has been successful.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2015-09-30 11:48:01 +01:00
parent d271976dbb
commit 7cabd0086a
2 changed files with 25 additions and 23 deletions
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32
drivers/irqchip/irq-gic-v3.c
View File

@ -171,27 +171,6 @@ static void __maybe_unused gic_write_sgi1r(u64 val)
asm volatile("msr_s " __stringify(ICC_SGI1R_EL1) ", %0" : : "r" (val));
}
static void gic_enable_sre(void)
{
u64 val;
asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
val |= ICC_SRE_EL1_SRE;
asm volatile("msr_s " __stringify(ICC_SRE_EL1) ", %0" : : "r" (val));
isb();
/*
* Need to check that the SRE bit has actually been set. If
* not, it means that SRE is disabled at EL2. We're going to
* die painfully, and there is nothing we can do about it.
*
* Kindly inform the luser.
*/
asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
if (!(val & ICC_SRE_EL1_SRE))
pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
}
static void gic_enable_redist(bool enable)
{
void __iomem *rbase;
@ -525,8 +504,15 @@ static int gic_populate_rdist(void)
static void gic_cpu_sys_reg_init(void)
{
/* Enable system registers */
gic_enable_sre();
/*
* Need to check that the SRE bit has actually been set. If
* not, it means that SRE is disabled at EL2. We're going to
* die painfully, and there is nothing we can do about it.
*
* Kindly inform the luser.
*/
if (!gic_enable_sre())
pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
/* Set priority mask register */
gic_write_pmr(DEFAULT_PMR_VALUE);

16
include/linux/irqchip/arm-gic-v3.h
View File

@ -398,6 +398,22 @@ static inline void gic_write_dir(u64 irq)
isb();
}
static inline bool gic_enable_sre(void)
{
u64 val;
asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
if (val & ICC_SRE_EL1_SRE)
return true;
val |= ICC_SRE_EL1_SRE;
asm volatile("msr_s " __stringify(ICC_SRE_EL1) ", %0" : : "r" (val));
isb();
asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
return !!(val & ICC_SRE_EL1_SRE);
}
struct irq_domain;
int its_cpu_init(void);
int its_init(struct device_node *node, struct rdists *rdists,