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irqchip/gic-v3: Init SRE before poking sysregs

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The GICv3 driver pokes GICv3 system registers in gic_prio_init() before
gic_cpu_sys_reg_init() ensures that GICv3 system registers have been
enabled by writing to ICC_SRE_EL1.SRE.

On arm64 this is benign as has_useable_gicv3_cpuif() runs earlier during
cpufeature detection, and this enables the GICv3 system registers.

On 32-bit arm when booting on an FVP using the boot-wrapper, the accesses
in gic_prio_init() end up being UNDEFINED and crashes the kernel during
boot.

This is a regression introduced by the addition of gic_prio_init().

Fix this by factoring out the SRE initialization into a new function and
calling it early in the three paths where SRE may not have been
initialized:

(1) gic_init_bases(), before the primary CPU pokes GICv3 sysregs in
    gic_prio_init().

(2) gic_starting_cpu(), before secondary CPUs initialize GICv3 sysregs
    in gic_cpu_init().

(3) gic_cpu_pm_notifier(), before CPUs re-initialize GICv3 sysregs in
    gic_cpu_sys_reg_init().

Fixes: d447bf09a4 ("irqchip/gic-v3: Detect GICD_CTRL.DS and SCR_EL3.FIQ earlier")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Mark Rutland
2024-08-22 11:23:08 +01:00
committed by Thomas Gleixner
parent c5af2c90ba
commit 71c8e2a7c8
1 changed files with 14 additions and 7 deletions
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21
drivers/irqchip/irq-gic-v3.c
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@@ -1154,14 +1154,8 @@ static void gic_update_rdist_properties(void)
gic_data.rdists.has_vpend_valid_dirty ? "Valid+Dirty " : "");
}
static void gic_cpu_sys_reg_init(void)
static void gic_cpu_sys_reg_enable(void)
{
int i, cpu = smp_processor_id();
u64 mpidr = gic_cpu_to_affinity(cpu);
u64 need_rss = MPIDR_RS(mpidr);
bool group0;
u32 pribits;
/*
* 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
@@ -1172,6 +1166,16 @@ static void gic_cpu_sys_reg_init(void)
if (!gic_enable_sre())
pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
}
static void gic_cpu_sys_reg_init(void)
{
int i, cpu = smp_processor_id();
u64 mpidr = gic_cpu_to_affinity(cpu);
u64 need_rss = MPIDR_RS(mpidr);
bool group0;
u32 pribits;
pribits = gic_get_pribits();
group0 = gic_has_group0();
@@ -1333,6 +1337,7 @@ static int gic_check_rdist(unsigned int cpu)
static int gic_starting_cpu(unsigned int cpu)
{
gic_cpu_sys_reg_enable();
gic_cpu_init();
if (gic_dist_supports_lpis())
@@ -1498,6 +1503,7 @@ static int gic_cpu_pm_notifier(struct notifier_block *self,
if (cmd == CPU_PM_EXIT) {
if (gic_dist_security_disabled())
gic_enable_redist(true);
gic_cpu_sys_reg_enable();
gic_cpu_sys_reg_init();
} else if (cmd == CPU_PM_ENTER && gic_dist_security_disabled()) {
gic_write_grpen1(0);
@@ -2070,6 +2076,7 @@ static int __init gic_init_bases(phys_addr_t dist_phys_base,
gic_update_rdist_properties();
gic_cpu_sys_reg_enable();
gic_prio_init();
gic_dist_init();
gic_cpu_init();