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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v1 08/15] arm64: Add ICV_IAR1_EL1 handler
This patch is ported to xen from linux commit
132a324ab62fe4fb8d6dcc2ab4eddb0e93b69afe.
Add a handler for reading the guest's view of the ICC_IAR1_EL1
register. This involves finding the highest priority Group-1
interrupt, checking against both PMR and the active group
priority, activating the interrupt and setting the group
priority as active.
Signed-off-by: Manish Jaggi <manish.jaggi@xxxxxxxxxx>
diff --git a/xen/arch/arm/arm64/vgic-v3-sr.c b/xen/arch/arm/arm64/vgic-v3-sr.c
index 93ac6f03a9..8af943b37a 100644
--- a/xen/arch/arm/arm64/vgic-v3-sr.c
+++ b/xen/arch/arm/arm64/vgic-v3-sr.c
@@ -21,8 +21,18 @@
#include <asm/traps.h>
#include <asm/system.h>
#include <asm/gic_v3_defs.h>
+#include <xen/sched.h>
+#include <asm/vtimer.h>
+
#define vtr_to_nr_pre_bits(v) ((((uint32_t)(v) >> 26) & 7) + 1)
+#define vtr_to_nr_apr_regs(v) (1 << (vtr_to_nr_pre_bits(v) - 5))
+
+#define ESR_ELx_SYS64_ISS_CRM_SHIFT 1
+#define ESR_ELx_SYS64_ISS_CRM_MASK (0xf << ESR_ELx_SYS64_ISS_CRM_SHIFT)
+
+#define ICC_IAR1_EL1_SPURIOUS 0x3ff
+#define VGIC_MAX_SPI 1019
static int __vgic_v3_bpr_min(void)
{
@@ -289,6 +299,186 @@ void gicv3_ich_write_lr(int lr, uint64_t val)
isb();
}
+static int __vgic_v3_get_group(const union hsr hsr)
+{
+ uint8_t crm = (hsr.bits & ESR_ELx_SYS64_ISS_CRM_MASK) >>
+ ESR_ELx_SYS64_ISS_CRM_SHIFT;
+
+ return crm != 8;
+}
+
+unsigned int gic_get_num_lrs(void)
+{
+ uint32_t vtr;
+
+ vtr = READ_SYSREG32(ICH_VTR_EL2);
+ return (vtr & GICH_VTR_NRLRGS) + 1;
+}
+
+static int __vgic_v3_highest_priority_lr(struct cpu_user_regs *regs,
+ uint32_t vmcr, uint64_t *lr_val)
+{
+ int i, lr = -1;
+ unsigned int used_lrs = gic_get_num_lrs();
+ uint8_t priority = GICV3_IDLE_PRIORITY;
+
+ for ( i = 0; i < used_lrs; i++ )
+ {
+ uint64_t val = gicv3_ich_read_lr(i);
+ uint8_t lr_prio = (val & ICH_LR_PRIORITY_MASK) >>
ICH_LR_PRIORITY_SHIFT;
+
+ /* Not pending in the state? */
+ if ( (val & ICH_LR_STATE) != ICH_LR_PENDING_BIT )
+ continue;
+
+ /* Group-0 interrupt, but Group-0 disabled? */
+ if ( !(val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG0_MASK) )
+ continue;
+
+ /* Group-1 interrupt, but Group-1 disabled? */
+ if ( (val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG1_MASK) )
+ continue;
+
+ /* Not the highest priority? */
+ if ( lr_prio >= priority )
+ continue;
+
+ /* This is a candidate */
+ priority = lr_prio;
+ *lr_val = val;
+ lr = i;
+ }
+
+ if ( lr == -1 )
+ *lr_val = ICC_IAR1_EL1_SPURIOUS;
+
+ return lr;
+}
+
+static int __vgic_v3_get_highest_active_priority(void)
+{
+ int i;
+ uint32_t hap = 0;
+ uint8_t nr_apr_regs = vtr_to_nr_apr_regs(READ_SYSREG32(ICH_VTR_EL2));
+
+ for ( i = 0; i < nr_apr_regs; i++ )
+ {
+ uint32_t val;
+
+ /*
+ * The ICH_AP0Rn_EL2 and ICH_AP1Rn_EL2 registers
+ * contain the active priority levels for this VCPU
+ * for the maximum number of supported priority
+ * levels, and we return the full priority level only
+ * if the BPR is programmed to its minimum, otherwise
+ * we return a combination of the priority level and
+ * subpriority, as determined by the setting of the
+ * BPR, but without the full subpriority.
+ */
+ val = __vgic_v3_read_ap0rn(i);
+ val |= __vgic_v3_read_ap1rn(i);
+ if ( !val )
+ {
+ hap += 32;
+ continue;
+ }
+
+ return (hap + __ffs(val)) << __vgic_v3_bpr_min();
+ }
+
+ return GICV3_IDLE_PRIORITY;
+}
+
+/*
+ * Convert a priority to a preemption level, taking the relevant BPR
+ * into account by zeroing the sub-priority bits.
+ */
+static uint8_t __vgic_v3_pri_to_pre(uint8_t pri, uint32_t vmcr, int grp)
+{
+ unsigned int bpr;
+
+ if ( !grp )
+ bpr = __vgic_v3_get_bpr0(vmcr) + 1;
+ else
+ bpr = __vgic_v3_get_bpr1(vmcr);
+
+ return pri & (GENMASK(7, 0) << bpr);
+}
+
+/*
+ * The priority value is independent of any of the BPR values, so we
+ * normalize it using the minumal BPR value. This guarantees that no
+ * matter what the guest does with its BPR, we can always set/get the
+ * same value of a priority.
+ */
+static void __vgic_v3_set_active_priority(uint8_t pri, uint32_t vmcr, int grp)
+{
+ uint8_t pre, ap;
+ uint32_t val;
+ int apr;
+
+ pre = __vgic_v3_pri_to_pre(pri, vmcr, grp);
+ ap = pre >> __vgic_v3_bpr_min();
+ apr = ap / 32;
+
+ if ( !grp )
+ {
+ val = __vgic_v3_read_ap0rn(apr);
+ __vgic_v3_write_ap0rn(val | BIT(ap % 32), apr);
+ }
+ else
+ {
+ val = __vgic_v3_read_ap1rn(apr);
+ __vgic_v3_write_ap1rn(val | BIT(ap % 32), apr);
+ }
+}
+
+static void __vgic_v3_read_iar(struct cpu_user_regs *regs, int regidx,
+ const union hsr hsr)
+{
+ uint64_t lr_val;
+ uint8_t lr_prio, pmr;
+ int lr, grp;
+
+ uint32_t vmcr = READ_SYSREG32(ICH_VMCR_EL2);
+ grp = __vgic_v3_get_group(hsr);
+
+ lr = __vgic_v3_highest_priority_lr(regs, vmcr, &lr_val);
+ if ( lr < 0 )
+ goto spurious;
+
+ if ( grp != !!(lr_val & ICH_LR_GROUP) )
+ goto spurious;
+
+ pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
+ lr_prio = (lr_val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT;
+ if ( pmr <= lr_prio )
+ goto spurious;
+
+ if ( __vgic_v3_get_highest_active_priority() <=
+ __vgic_v3_pri_to_pre(lr_prio, vmcr, grp) )
+ goto spurious;
+
+ lr_val &= ~ICH_LR_STATE;
+ /* No active state for LPIs */
+ if ( (lr_val & ICH_LR_VIRTUAL_ID_MASK) <= VGIC_MAX_SPI )
+ lr_val |= ICH_LR_ACTIVE_BIT;
+
+ gicv3_ich_write_lr(lr, lr_val);
+ __vgic_v3_set_active_priority(lr_prio, vmcr, grp);
+ set_user_reg(regs, regidx, lr_val & ICH_LR_VIRTUAL_ID_MASK);
+
+ return;
+
+spurious:
+ set_user_reg(regs, regidx, ICC_IAR1_EL1_SPURIOUS);
+}
+
+void handle_iar(struct cpu_user_regs *regs, int regidx, const union hsr hsr)
+{
+ __vgic_v3_read_iar(regs, regidx, hsr);
+}
+
bool vgic_v3_handle_cpuif_access(struct cpu_user_regs *regs, const union hsr
hsr)
{
bool ret = true;
@@ -312,6 +502,10 @@ bool vgic_v3_handle_cpuif_access(struct cpu_user_regs
*regs, const union hsr hsr
handle_igrpen1(regs, regidx, hsr);
break;
+ case HSR_SYSREG_ICC_IAR1_EL1:
+ handle_iar(regs, regidx, hsr);
+ break;
+
default:
ret = false;
break;
diff --git a/xen/include/asm-arm/arm64/sysregs.h
b/xen/include/asm-arm/arm64/sysregs.h
index 731cabc74a..53d2251840 100644
--- a/xen/include/asm-arm/arm64/sysregs.h
+++ b/xen/include/asm-arm/arm64/sysregs.h
@@ -91,6 +91,7 @@
#define HSR_SYSREG_ICC_SRE_EL1 HSR_SYSREG(3,0,c12,c12,5)
#define HSR_SYSREG_ICC_BPR1_EL1 HSR_SYSREG(3,0,c12,c12,3)
#define HSR_SYSREG_ICC_IGRPEN1_EL1 HSR_SYSREG(3,0,c12,c12,7)
+#define HSR_SYSREG_ICC_IAR1_EL1 HSR_SYSREG(3,0,c12,c12,0)
#define HSR_SYSREG_CONTEXTIDR_EL1 HSR_SYSREG(3,0,c13,c0,1)
#define HSR_SYSREG_PMCR_EL0 HSR_SYSREG(3,3,c9,c12,0)
diff --git a/xen/include/asm-arm/gic_v3_defs.h
b/xen/include/asm-arm/gic_v3_defs.h
index ff8bda37d1..884fce0fd0 100644
--- a/xen/include/asm-arm/gic_v3_defs.h
+++ b/xen/include/asm-arm/gic_v3_defs.h
@@ -67,6 +67,7 @@
*/
#define GICV3_GICD_IIDR_VAL 0x34c
#define GICV3_GICR_IIDR_VAL GICV3_GICD_IIDR_VAL
+#define GICV3_IDLE_PRIORITY 0xff
#define GICR_CTLR (0x0000)
#define GICR_IIDR (0x0004)
@@ -165,6 +166,10 @@
#define ICH_VMCR_BPR1_MASK (7 << ICH_VMCR_BPR1_SHIFT)
#define ICH_VMCR_ENG1_SHIFT 1
#define ICH_VMCR_ENG1_MASK (1 << ICH_VMCR_ENG1_SHIFT)
+#define ICH_VMCR_ENG0_SHIFT 0
+#define ICH_VMCR_ENG0_MASK (1 << ICH_VMCR_ENG0_SHIFT)
+#define ICH_VMCR_PMR_SHIFT 24
+#define ICH_VMCR_PMR_MASK (0xffUL << ICH_VMCR_PMR_SHIFT)
#define GICH_LR_VIRTUAL_MASK 0xffff
#define GICH_LR_VIRTUAL_SHIFT 0
@@ -182,6 +187,18 @@
#define GICH_LR_GRP1 (1UL<<60)
#define GICH_LR_HW (1UL<<61)
+#define ICH_LR_PRIORITY_SHIFT 48
+#define ICH_LR_PRIORITY_MASK (0xffULL << ICH_LR_PRIORITY_SHIFT)
+#define ICH_LR_EOI (1ULL << 41)
+#define ICH_LR_GROUP (1ULL << 60)
+#define ICH_LR_HW (1ULL << 61)
+#define ICH_LR_STATE (3ULL << 62)
+#define ICH_LR_PENDING_BIT (1ULL << 62)
+#define ICH_LR_ACTIVE_BIT (1ULL << 63)
+#define ICH_LR_PHYS_ID_SHIFT 32
+#define ICH_LR_PHYS_ID_MASK (0x3ffULL << ICH_LR_PHYS_ID_SHIFT)
+#define ICH_LR_VIRTUAL_ID_MASK ((1ULL << 32) - 1)
+
#define GICH_VTR_NRLRGS 0x3f
#define GICH_VTR_PRIBITS_MASK 0x7
#define GICH_VTR_PRIBITS_SHIFT 29
--
2.14.1
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