Re: [boot-wrapper PATCH 08/12] Consistently use logical CPU IDs
From: Andre Przywara <andre.przywara@arm.com>
Date: 2021-07-30 17:41:42
On Thu, 29 Jul 2021 16:20:46 +0100 Mark Rutland [off-list ref] wrote:
In some places we assume that the cpu with MPIDR_EL1.Aff* == 0 is the same as logical CPU 0. While this is almost certainly true, it would be best to consistently use the ligical ID.
logical
Indeed, and I think can we can configure the model to have the primary
CPU with an MPIDR != 0.
Add a new `this_cpu_logical_id()` helper, and use this in preference to checking the MPIDR_EL1.Aff* bits directly. Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com> Cheers, Andre
quoted hunk ↗ jump to hunk
--- gic-v3.c | 4 +--- gic.c | 3 +-- include/cpu.h | 2 ++ psci.c | 5 ++--- 4 files changed, 6 insertions(+), 8 deletions(-)diff --git a/gic-v3.c b/gic-v3.c index ae2d2bc..62f9676 100644 --- a/gic-v3.c +++ b/gic-v3.c@@ -101,8 +101,6 @@ void gic_secure_init_primary(void) void gic_secure_init(void) { - uint32_t cpu = read_mpidr(); - uint32_t sre; /*@@ -113,7 +111,7 @@ void gic_secure_init(void) if (!has_gicv3_sysreg()) return; - if (cpu == 0) + if (this_cpu_logical_id() == 0) gic_secure_init_primary(); sre = gic_read_icc_sre();diff --git a/gic.c b/gic.c index a84779e..04d4289 100644 --- a/gic.c +++ b/gic.c@@ -31,14 +31,13 @@ void gic_secure_init(void) { unsigned int i; - uint32_t cpu = read_mpidr(); void *gicd_base = (void *)GIC_DIST_BASE; void *gicc_base = (void *)GIC_CPU_BASE; /* Set local interrupts to Group 1 (those fields are banked) */ raw_writel(~0, gicd_base + GICD_IGROUPRn); - if (cpu == 0) { + if (this_cpu_logical_id() == 0) { uint32_t typer = raw_readl(gicd_base + GICD_TYPER); /* Set SPIs to Group 1 */diff --git a/include/cpu.h b/include/cpu.h index 704d6d8..4bfb172 100644 --- a/include/cpu.h +++ b/include/cpu.h@@ -25,5 +25,7 @@ unsigned int find_logical_id(unsigned long mpidr); +#define this_cpu_logical_id() find_logical_id(read_mpidr()) + #endif /* !__ASSEMBLY__ */ #endifdiff --git a/psci.c b/psci.c index e5d54b7..df5b0f2 100644 --- a/psci.c +++ b/psci.c@@ -35,7 +35,7 @@ static int psci_cpu_on(unsigned long target_mpidr, unsigned long address) { int ret; unsigned int cpu = find_logical_id(target_mpidr); - unsigned int this_cpu = find_logical_id(read_mpidr()); + unsigned int this_cpu = this_cpu_logical_id(); if (cpu == MPIDR_INVALID) return PSCI_RET_INVALID_PARAMETERS;@@ -49,8 +49,7 @@ static int psci_cpu_on(unsigned long target_mpidr, unsigned long address) static int psci_cpu_off(void) { - unsigned long mpidr = read_mpidr(); - unsigned int cpu = find_logical_id(mpidr); + unsigned int cpu = this_cpu_logical_id(); if (cpu == MPIDR_INVALID) return PSCI_RET_DENIED;
_______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel