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From: Michal Orzel <michal.orzel@arm.com>
To: xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
	bertrand.marquis@arm.com
Subject: [PATCH 3/9] arm/gic: Get rid of READ/WRITE_SYSREG32
Date: Tue, 20 Apr 2021 09:08:47 +0200	[thread overview]
Message-ID: <20210420070853.8918-4-michal.orzel@arm.com> (raw)
In-Reply-To: <20210420070853.8918-1-michal.orzel@arm.com>

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)
-vmcr
-sre_el1
-apr0
-apr1

Signed-off-by: Michal Orzel <michal.orzel@arm.com>
---
 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. */
+    return (unsigned int)irq;
 }
 
 /*
@@ -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;
     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();
     }
+    /* Number of priority levels do not exceed 32bit */
+    return (unsigned int)apr;
 }
 
 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
-- 
2.29.0



  parent reply	other threads:[~2021-04-20  7:09 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-20  7:08 [PATCH 0/9] xen/arm64: Get rid of READ/WRITE_SYSREG32 Michal Orzel
2021-04-20  7:08 ` [PATCH 1/9] arm64/vfp: " Michal Orzel
2021-04-20 13:04   ` Julien Grall
2021-04-20  7:08 ` [PATCH 2/9] arm/domain: " Michal Orzel
2021-04-20 13:12   ` Julien Grall
2021-04-21  7:36     ` Michal Orzel
2021-04-21 10:20       ` Julien Grall
2021-04-20  7:08 ` Michal Orzel [this message]
2021-04-20 13:28   ` [PATCH 3/9] arm/gic: " Julien Grall
2021-04-21  7:48     ` Michal Orzel
2021-04-21 10:21       ` Julien Grall
2021-04-20  7:08 ` [PATCH 4/9] arm/p2m: " Michal Orzel
2021-04-20 13:31   ` Julien Grall
2021-04-20  7:08 ` [PATCH 5/9] arm/mm: " Michal Orzel
2021-04-20 13:37   ` Julien Grall
2021-04-22 11:47     ` Michal Orzel
2021-04-22 13:40       ` Julien Grall
2021-04-20  7:08 ` [PATCH 6/9] arm/page: " Michal Orzel
2021-04-21 15:11   ` Julien Grall
2021-04-20  7:08 ` [PATCH 7/9] arm/time,vtimer: " Michal Orzel
2021-04-21 16:01   ` Julien Grall
2021-04-20  7:08 ` [PATCH 8/9] arm: Change type of hsr to register_t Michal Orzel
2021-04-21 19:02   ` Julien Grall
2021-04-20  7:08 ` [PATCH 9/9] xen/arm64: Remove READ/WRITE_SYSREG32 helper macros Michal Orzel
2021-04-21 19:16   ` Julien Grall
2021-04-27  7:16     ` Michal Orzel
2021-04-27  8:30       ` Julien Grall

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