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Re: [PATCH 3/9] arm/gic: Get rid of READ/WRITE_SYSREG32
Hi Michal,
On 20/04/2021 08:08, Michal Orzel wrote:
AArch64 system registers are 64bit whereas AArch32 ones
are 32bit or 64bit. MSR/MRS are expecting 64bit values thus
we should get rid of helpers READ/WRITE_SYSREG32
in favour of using READ/WRITE_SYSREG.
We should also use register_t type when reading sysregs
which can correspond to uint64_t or uint32_t.
Even though many AArch64 sysregs have upper 32bit reserved
it does not mean that they can't be widen in the future.
Modify types of following members of struct gic_v3 to register_t:
-hcr(not used at all in Xen)
It looks like we never used it (even in the patch introducing it). So I
would suggest to remove it in a patch before this one.
-vmcr
-sre_el1
-apr0
-apr1
Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
xen/arch/arm/gic-v3-lpi.c | 2 +-
xen/arch/arm/gic-v3.c | 96 ++++++++++++++++++++-------------------
xen/include/asm-arm/gic.h | 6 +--
3 files changed, 54 insertions(+), 50 deletions(-)
diff --git a/xen/arch/arm/gic-v3-lpi.c b/xen/arch/arm/gic-v3-lpi.c
index 869bc97fa1..e1594dd20e 100644
--- a/xen/arch/arm/gic-v3-lpi.c
+++ b/xen/arch/arm/gic-v3-lpi.c
@@ -178,7 +178,7 @@ void gicv3_do_LPI(unsigned int lpi)
irq_enter();
/* EOI the LPI already. */
- WRITE_SYSREG32(lpi, ICC_EOIR1_EL1);
+ WRITE_SYSREG(lpi, ICC_EOIR1_EL1);
/* Find out if a guest mapped something to this physical LPI. */
hlpip = gic_get_host_lpi(lpi);
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index ac28013c19..0634013a67 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -246,12 +246,12 @@ static void gicv3_ich_write_lr(int lr, uint64_t val)
*/
static void gicv3_enable_sre(void)
{
- uint32_t val;
+ register_t val;
- val = READ_SYSREG32(ICC_SRE_EL2);
+ val = READ_SYSREG(ICC_SRE_EL2);
val |= GICC_SRE_EL2_SRE;
- WRITE_SYSREG32(val, ICC_SRE_EL2);
+ WRITE_SYSREG(val, ICC_SRE_EL2);
isb();
}
@@ -315,16 +315,16 @@ static void restore_aprn_regs(const union gic_state_data *d)
switch ( gicv3.nr_priorities )
{
case 7:
- WRITE_SYSREG32(d->v3.apr0[2], ICH_AP0R2_EL2);
- WRITE_SYSREG32(d->v3.apr1[2], ICH_AP1R2_EL2);
+ WRITE_SYSREG(d->v3.apr0[2], ICH_AP0R2_EL2);
+ WRITE_SYSREG(d->v3.apr1[2], ICH_AP1R2_EL2);
/* Fall through */
case 6:
- WRITE_SYSREG32(d->v3.apr0[1], ICH_AP0R1_EL2);
- WRITE_SYSREG32(d->v3.apr1[1], ICH_AP1R1_EL2);
+ WRITE_SYSREG(d->v3.apr0[1], ICH_AP0R1_EL2);
+ WRITE_SYSREG(d->v3.apr1[1], ICH_AP1R1_EL2);
/* Fall through */
case 5:
- WRITE_SYSREG32(d->v3.apr0[0], ICH_AP0R0_EL2);
- WRITE_SYSREG32(d->v3.apr1[0], ICH_AP1R0_EL2);
+ WRITE_SYSREG(d->v3.apr0[0], ICH_AP0R0_EL2);
+ WRITE_SYSREG(d->v3.apr1[0], ICH_AP1R0_EL2);
break;
default:
BUG();
@@ -338,16 +338,16 @@ static void save_aprn_regs(union gic_state_data *d)
switch ( gicv3.nr_priorities )
{
case 7:
- d->v3.apr0[2] = READ_SYSREG32(ICH_AP0R2_EL2);
- d->v3.apr1[2] = READ_SYSREG32(ICH_AP1R2_EL2);
+ d->v3.apr0[2] = READ_SYSREG(ICH_AP0R2_EL2);
+ d->v3.apr1[2] = READ_SYSREG(ICH_AP1R2_EL2);
/* Fall through */
case 6:
- d->v3.apr0[1] = READ_SYSREG32(ICH_AP0R1_EL2);
- d->v3.apr1[1] = READ_SYSREG32(ICH_AP1R1_EL2);
+ d->v3.apr0[1] = READ_SYSREG(ICH_AP0R1_EL2);
+ d->v3.apr1[1] = READ_SYSREG(ICH_AP1R1_EL2);
/* Fall through */
case 5:
- d->v3.apr0[0] = READ_SYSREG32(ICH_AP0R0_EL2);
- d->v3.apr1[0] = READ_SYSREG32(ICH_AP1R0_EL2);
+ d->v3.apr0[0] = READ_SYSREG(ICH_AP0R0_EL2);
+ d->v3.apr1[0] = READ_SYSREG(ICH_AP1R0_EL2);
break;
default:
BUG();
@@ -371,15 +371,15 @@ static void gicv3_save_state(struct vcpu *v)
dsb(sy);
gicv3_save_lrs(v);
save_aprn_regs(&v->arch.gic);
- v->arch.gic.v3.vmcr = READ_SYSREG32(ICH_VMCR_EL2);
- v->arch.gic.v3.sre_el1 = READ_SYSREG32(ICC_SRE_EL1);
+ v->arch.gic.v3.vmcr = READ_SYSREG(ICH_VMCR_EL2);
+ v->arch.gic.v3.sre_el1 = READ_SYSREG(ICC_SRE_EL1);
}
static void gicv3_restore_state(const struct vcpu *v)
{
- uint32_t val;
+ register_t val;
- val = READ_SYSREG32(ICC_SRE_EL2);
+ val = READ_SYSREG(ICC_SRE_EL2);
/*
* Don't give access to system registers when the guest is using
* GICv2
@@ -388,7 +388,7 @@ static void gicv3_restore_state(const struct vcpu *v)
val &= ~GICC_SRE_EL2_ENEL1;
else
val |= GICC_SRE_EL2_ENEL1;
- WRITE_SYSREG32(val, ICC_SRE_EL2);
+ WRITE_SYSREG(val, ICC_SRE_EL2);
/*
* VFIQEn is RES1 if ICC_SRE_EL1.SRE is 1. This causes a Group0
@@ -398,9 +398,9 @@ static void gicv3_restore_state(const struct vcpu *v)
* want before starting to mess with the rest of the GIC, and
* VMCR_EL1 in particular.
*/
- WRITE_SYSREG32(v->arch.gic.v3.sre_el1, ICC_SRE_EL1);
+ WRITE_SYSREG(v->arch.gic.v3.sre_el1, ICC_SRE_EL1);
isb();
- WRITE_SYSREG32(v->arch.gic.v3.vmcr, ICH_VMCR_EL2);
+ WRITE_SYSREG(v->arch.gic.v3.vmcr, ICH_VMCR_EL2);
restore_aprn_regs(&v->arch.gic);
gicv3_restore_lrs(v);
@@ -468,24 +468,25 @@ static void gicv3_mask_irq(struct irq_desc *irqd)
static void gicv3_eoi_irq(struct irq_desc *irqd)
{
/* Lower the priority */
- WRITE_SYSREG32(irqd->irq, ICC_EOIR1_EL1);
+ WRITE_SYSREG(irqd->irq, ICC_EOIR1_EL1);
isb();
}
static void gicv3_dir_irq(struct irq_desc *irqd)
{
/* Deactivate */
- WRITE_SYSREG32(irqd->irq, ICC_DIR_EL1);
+ WRITE_SYSREG(irqd->irq, ICC_DIR_EL1);
isb();
}
static unsigned int gicv3_read_irq(void)
{
- unsigned int irq = READ_SYSREG32(ICC_IAR1_EL1);
+ register_t irq = READ_SYSREG(ICC_IAR1_EL1);
dsb(sy);
- return irq;
+ /* Number of IRQs do not exceed 32bit. */
If we want to be pedantic, the IRQs are encoded using 23-bit. So maybe
we want to mask them below.
+ return (unsigned int)irq;
NIT: We tend to avoid explicit cast unless they are strictly necessary
because they can be more harmful than implicit cast (the compiler may
not cast every conversion). So I would drop it and just keep the comment.
}
/*
@@ -857,16 +858,16 @@ static int gicv3_cpu_init(void)
gicv3_enable_sre();
/* No priority grouping */
- WRITE_SYSREG32(0, ICC_BPR1_EL1);
+ WRITE_SYSREG(0, ICC_BPR1_EL1);
/* Set priority mask register */
- WRITE_SYSREG32(DEFAULT_PMR_VALUE, ICC_PMR_EL1);
+ WRITE_SYSREG(DEFAULT_PMR_VALUE, ICC_PMR_EL1);
/* EOI drops priority, DIR deactivates the interrupt (mode 1) */
- WRITE_SYSREG32(GICC_CTLR_EL1_EOImode_drop, ICC_CTLR_EL1);
+ WRITE_SYSREG(GICC_CTLR_EL1_EOImode_drop, ICC_CTLR_EL1);
/* Enable Group1 interrupts */
- WRITE_SYSREG32(1, ICC_IGRPEN1_EL1);
+ WRITE_SYSREG(1, ICC_IGRPEN1_EL1);
/* Sync at once at the end of cpu interface configuration */
isb();
@@ -876,15 +877,15 @@ static int gicv3_cpu_init(void)
static void gicv3_cpu_disable(void)
{
- WRITE_SYSREG32(0, ICC_CTLR_EL1);
+ WRITE_SYSREG(0, ICC_CTLR_EL1);
isb();
}
static void gicv3_hyp_init(void)
{
- uint32_t vtr;
+ register_t vtr;
- vtr = READ_SYSREG32(ICH_VTR_EL2);
+ vtr = READ_SYSREG(ICH_VTR_EL2);
gicv3_info.nr_lrs = (vtr & ICH_VTR_NRLRGS) + 1;
gicv3.nr_priorities = ((vtr >> ICH_VTR_PRIBITS_SHIFT) &
ICH_VTR_PRIBITS_MASK) + 1;
@@ -892,8 +893,8 @@ static void gicv3_hyp_init(void)
if ( !((gicv3.nr_priorities > 4) && (gicv3.nr_priorities < 8)) )
panic("GICv3: Invalid number of priority bits\n");
- WRITE_SYSREG32(ICH_VMCR_EOI | ICH_VMCR_VENG1, ICH_VMCR_EL2);
- WRITE_SYSREG32(GICH_HCR_EN, ICH_HCR_EL2);
+ WRITE_SYSREG(ICH_VMCR_EOI | ICH_VMCR_VENG1, ICH_VMCR_EL2);
+ WRITE_SYSREG(GICH_HCR_EN, ICH_HCR_EL2);
}
/* Set up the per-CPU parts of the GIC for a secondary CPU */
@@ -917,11 +918,11 @@ out:
static void gicv3_hyp_disable(void)
{
- uint32_t hcr;
+ register_t hcr;
- hcr = READ_SYSREG32(ICH_HCR_EL2);
+ hcr = READ_SYSREG(ICH_HCR_EL2);
hcr &= ~GICH_HCR_EN;
- WRITE_SYSREG32(hcr, ICH_HCR_EL2);
+ WRITE_SYSREG(hcr, ICH_HCR_EL2);
isb();
}
@@ -1140,39 +1141,42 @@ static void gicv3_write_lr(int lr_reg, const struct gic_lr *lr)
static void gicv3_hcr_status(uint32_t flag, bool status)
{
- uint32_t hcr;
+ register_t hcr;
- hcr = READ_SYSREG32(ICH_HCR_EL2);
+ hcr = READ_SYSREG(ICH_HCR_EL2);
if ( status )
- WRITE_SYSREG32(hcr | flag, ICH_HCR_EL2);
+ WRITE_SYSREG(hcr | flag, ICH_HCR_EL2);
else
- WRITE_SYSREG32(hcr & (~flag), ICH_HCR_EL2);
+ WRITE_SYSREG(hcr & (~flag), ICH_HCR_EL2);
isb();
}
static unsigned int gicv3_read_vmcr_priority(void)
{
- return ((READ_SYSREG32(ICH_VMCR_EL2) >> ICH_VMCR_PRIORITY_SHIFT) &
+ return ((READ_SYSREG(ICH_VMCR_EL2) >> ICH_VMCR_PRIORITY_SHIFT) &
ICH_VMCR_PRIORITY_MASK);
}
/* Only support reading GRP1 APRn registers */
static unsigned int gicv3_read_apr(int apr_reg)
{
+ register_t apr;
NIT: Please add a newline after the declaration. This will be easier to
read.
switch ( apr_reg )
{
case 0:
ASSERT(gicv3.nr_priorities > 4 && gicv3.nr_priorities < 8);
- return READ_SYSREG32(ICH_AP1R0_EL2);
+ apr = READ_SYSREG(ICH_AP1R0_EL2);
case 1:
ASSERT(gicv3.nr_priorities > 5 && gicv3.nr_priorities < 8);
- return READ_SYSREG32(ICH_AP1R1_EL2);
+ apr = READ_SYSREG(ICH_AP1R1_EL2);
case 2:
ASSERT(gicv3.nr_priorities > 6 && gicv3.nr_priorities < 8);
- return READ_SYSREG32(ICH_AP1R2_EL2);
+ apr = READ_SYSREG(ICH_AP1R2_EL2);
default:
BUG();
}
NIT: Please add a newline here. This will be easier to read.
+ /* Number of priority levels do not exceed 32bit */
+ return (unsigned int)apr;
NIT: Same remark as before for the cast.
}
static bool gicv3_read_pending_state(struct irq_desc *irqd)
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index ad0f7452d0..d750d070b4 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -171,9 +171,9 @@
* GICv3 registers that needs to be saved/restored
*/
struct gic_v3 {
- uint32_t hcr, vmcr, sre_el1;
- uint32_t apr0[4];
- uint32_t apr1[4];
+ register_t hcr, vmcr, sre_el1;
+ register_t apr0[4];
+ register_t apr1[4];
uint64_t lr[16];
};
#endif
Cheers,
--
Julien Grall
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