hw/intc/arm_gicv3: Add IRQ handling CPU interface registers

Add the CPU interface registers which deal with acknowledging
and dismissing interrupts.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Shannon Zhao <shannon.zhao@linaro.org>
Tested-by: Shannon Zhao <shannon.zhao@linaro.org>
Message-id: 1465915112-29272-19-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2016-06-17 15:23:48 +01:00
parent b1a0eb777d
commit 227a865366
3 changed files with 449 additions and 0 deletions

View File

@ -219,6 +219,297 @@ static void icc_pmr_write(CPUARMState *env, const ARMCPRegInfo *ri,
gicv3_cpuif_update(cs);
}
static void icc_activate_irq(GICv3CPUState *cs, int irq)
{
/* Move the interrupt from the Pending state to Active, and update
* the Active Priority Registers
*/
uint32_t mask = icc_gprio_mask(cs, cs->hppi.grp);
int prio = cs->hppi.prio & mask;
int aprbit = prio >> 1;
int regno = aprbit / 32;
int regbit = aprbit % 32;
cs->icc_apr[cs->hppi.grp][regno] |= (1 << regbit);
if (irq < GIC_INTERNAL) {
cs->gicr_iactiver0 = deposit32(cs->gicr_iactiver0, irq, 1, 1);
cs->gicr_ipendr0 = deposit32(cs->gicr_ipendr0, irq, 1, 0);
gicv3_redist_update(cs);
} else {
gicv3_gicd_active_set(cs->gic, irq);
gicv3_gicd_pending_clear(cs->gic, irq);
gicv3_update(cs->gic, irq, 1);
}
}
static uint64_t icc_hppir0_value(GICv3CPUState *cs, CPUARMState *env)
{
/* Return the highest priority pending interrupt register value
* for group 0.
*/
bool irq_is_secure;
if (cs->hppi.prio == 0xff) {
return INTID_SPURIOUS;
}
/* Check whether we can return the interrupt or if we should return
* a special identifier, as per the CheckGroup0ForSpecialIdentifiers
* pseudocode. (We can simplify a little because for us ICC_SRE_EL1.RM
* is always zero.)
*/
irq_is_secure = (!(cs->gic->gicd_ctlr & GICD_CTLR_DS) &&
(cs->hppi.grp != GICV3_G1NS));
if (cs->hppi.grp != GICV3_G0 && !arm_is_el3_or_mon(env)) {
return INTID_SPURIOUS;
}
if (irq_is_secure && !arm_is_secure(env)) {
/* Secure interrupts not visible to Nonsecure */
return INTID_SPURIOUS;
}
if (cs->hppi.grp != GICV3_G0) {
/* Indicate to EL3 that there's a Group 1 interrupt for the other
* state pending.
*/
return irq_is_secure ? INTID_SECURE : INTID_NONSECURE;
}
return cs->hppi.irq;
}
static uint64_t icc_hppir1_value(GICv3CPUState *cs, CPUARMState *env)
{
/* Return the highest priority pending interrupt register value
* for group 1.
*/
bool irq_is_secure;
if (cs->hppi.prio == 0xff) {
return INTID_SPURIOUS;
}
/* Check whether we can return the interrupt or if we should return
* a special identifier, as per the CheckGroup1ForSpecialIdentifiers
* pseudocode. (We can simplify a little because for us ICC_SRE_EL1.RM
* is always zero.)
*/
irq_is_secure = (!(cs->gic->gicd_ctlr & GICD_CTLR_DS) &&
(cs->hppi.grp != GICV3_G1NS));
if (cs->hppi.grp == GICV3_G0) {
/* Group 0 interrupts not visible via HPPIR1 */
return INTID_SPURIOUS;
}
if (irq_is_secure) {
if (!arm_is_secure(env)) {
/* Secure interrupts not visible in Non-secure */
return INTID_SPURIOUS;
}
} else if (!arm_is_el3_or_mon(env) && arm_is_secure(env)) {
/* Group 1 non-secure interrupts not visible in Secure EL1 */
return INTID_SPURIOUS;
}
return cs->hppi.irq;
}
static uint64_t icc_iar0_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
GICv3CPUState *cs = icc_cs_from_env(env);
uint64_t intid;
if (!icc_hppi_can_preempt(cs)) {
intid = INTID_SPURIOUS;
} else {
intid = icc_hppir0_value(cs, env);
}
if (!(intid >= INTID_SECURE && intid <= INTID_SPURIOUS)) {
icc_activate_irq(cs, intid);
}
trace_gicv3_icc_iar0_read(gicv3_redist_affid(cs), intid);
return intid;
}
static uint64_t icc_iar1_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
GICv3CPUState *cs = icc_cs_from_env(env);
uint64_t intid;
if (!icc_hppi_can_preempt(cs)) {
intid = INTID_SPURIOUS;
} else {
intid = icc_hppir1_value(cs, env);
}
if (!(intid >= INTID_SECURE && intid <= INTID_SPURIOUS)) {
icc_activate_irq(cs, intid);
}
trace_gicv3_icc_iar1_read(gicv3_redist_affid(cs), intid);
return intid;
}
static void icc_drop_prio(GICv3CPUState *cs, int grp)
{
/* Drop the priority of the currently active interrupt in
* the specified group.
*
* Note that we can guarantee (because of the requirement to nest
* ICC_IAR reads [which activate an interrupt and raise priority]
* with ICC_EOIR writes [which drop the priority for the interrupt])
* that the interrupt we're being called for is the highest priority
* active interrupt, meaning that it has the lowest set bit in the
* APR registers.
*
* If the guest does not honour the ordering constraints then the
* behaviour of the GIC is UNPREDICTABLE, which for us means that
* the values of the APR registers might become incorrect and the
* running priority will be wrong, so interrupts that should preempt
* might not do so, and interrupts that should not preempt might do so.
*/
int i;
for (i = 0; i < ARRAY_SIZE(cs->icc_apr[grp]); i++) {
uint64_t *papr = &cs->icc_apr[grp][i];
if (!*papr) {
continue;
}
/* Clear the lowest set bit */
*papr &= *papr - 1;
break;
}
/* running priority change means we need an update for this cpu i/f */
gicv3_cpuif_update(cs);
}
static bool icc_eoi_split(CPUARMState *env, GICv3CPUState *cs)
{
/* Return true if we should split priority drop and interrupt
* deactivation, ie whether the relevant EOIMode bit is set.
*/
if (arm_is_el3_or_mon(env)) {
return cs->icc_ctlr_el3 & ICC_CTLR_EL3_EOIMODE_EL3;
}
if (arm_is_secure_below_el3(env)) {
return cs->icc_ctlr_el1[GICV3_S] & ICC_CTLR_EL1_EOIMODE;
} else {
return cs->icc_ctlr_el1[GICV3_NS] & ICC_CTLR_EL1_EOIMODE;
}
}
static int icc_highest_active_group(GICv3CPUState *cs)
{
/* Return the group with the highest priority active interrupt.
* We can do this by just comparing the APRs to see which one
* has the lowest set bit.
* (If more than one group is active at the same priority then
* we're in UNPREDICTABLE territory.)
*/
int i;
for (i = 0; i < ARRAY_SIZE(cs->icc_apr[0]); i++) {
int g0ctz = ctz32(cs->icc_apr[GICV3_G0][i]);
int g1ctz = ctz32(cs->icc_apr[GICV3_G1][i]);
int g1nsctz = ctz32(cs->icc_apr[GICV3_G1NS][i]);
if (g1nsctz < g0ctz && g1nsctz < g1ctz) {
return GICV3_G1NS;
}
if (g1ctz < g0ctz) {
return GICV3_G1;
}
if (g0ctz < 32) {
return GICV3_G0;
}
}
/* No set active bits? UNPREDICTABLE; return -1 so the caller
* ignores the spurious EOI attempt.
*/
return -1;
}
static void icc_deactivate_irq(GICv3CPUState *cs, int irq)
{
if (irq < GIC_INTERNAL) {
cs->gicr_iactiver0 = deposit32(cs->gicr_iactiver0, irq, 1, 0);
gicv3_redist_update(cs);
} else {
gicv3_gicd_active_clear(cs->gic, irq);
gicv3_update(cs->gic, irq, 1);
}
}
static void icc_eoir_write(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t value)
{
/* End of Interrupt */
GICv3CPUState *cs = icc_cs_from_env(env);
int irq = value & 0xffffff;
int grp;
trace_gicv3_icc_eoir_write(gicv3_redist_affid(cs), value);
if (ri->crm == 8) {
/* EOIR0 */
grp = GICV3_G0;
} else {
/* EOIR1 */
if (arm_is_secure(env)) {
grp = GICV3_G1;
} else {
grp = GICV3_G1NS;
}
}
if (irq >= cs->gic->num_irq) {
/* This handles two cases:
* 1. If software writes the ID of a spurious interrupt [ie 1020-1023]
* to the GICC_EOIR, the GIC ignores that write.
* 2. If software writes the number of a non-existent interrupt
* this must be a subcase of "value written does not match the last
* valid interrupt value read from the Interrupt Acknowledge
* register" and so this is UNPREDICTABLE. We choose to ignore it.
*/
return;
}
if (icc_highest_active_group(cs) != grp) {
return;
}
icc_drop_prio(cs, grp);
if (!icc_eoi_split(env, cs)) {
/* Priority drop and deactivate not split: deactivate irq now */
icc_deactivate_irq(cs, irq);
}
}
static uint64_t icc_hppir0_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
GICv3CPUState *cs = icc_cs_from_env(env);
uint64_t value = icc_hppir0_value(cs, env);
trace_gicv3_icc_hppir0_read(gicv3_redist_affid(cs), value);
return value;
}
static uint64_t icc_hppir1_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
GICv3CPUState *cs = icc_cs_from_env(env);
uint64_t value = icc_hppir1_value(cs, env);
trace_gicv3_icc_hppir1_read(gicv3_redist_affid(cs), value);
return value;
}
static uint64_t icc_bpr_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
GICv3CPUState *cs = icc_cs_from_env(env);
@ -331,6 +622,104 @@ static void icc_ap_write(CPUARMState *env, const ARMCPRegInfo *ri,
gicv3_cpuif_update(cs);
}
static void icc_dir_write(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t value)
{
/* Deactivate interrupt */
GICv3CPUState *cs = icc_cs_from_env(env);
int irq = value & 0xffffff;
bool irq_is_secure, single_sec_state, irq_is_grp0;
bool route_fiq_to_el3, route_irq_to_el3, route_fiq_to_el2, route_irq_to_el2;
trace_gicv3_icc_dir_write(gicv3_redist_affid(cs), value);
if (irq >= cs->gic->num_irq) {
/* Also catches special interrupt numbers and LPIs */
return;
}
if (!icc_eoi_split(env, cs)) {
return;
}
int grp = gicv3_irq_group(cs->gic, cs, irq);
single_sec_state = cs->gic->gicd_ctlr & GICD_CTLR_DS;
irq_is_secure = !single_sec_state && (grp != GICV3_G1NS);
irq_is_grp0 = grp == GICV3_G0;
/* Check whether we're allowed to deactivate this interrupt based
* on its group and the current CPU state.
* These checks are laid out to correspond to the spec's pseudocode.
*/
route_fiq_to_el3 = env->cp15.scr_el3 & SCR_FIQ;
route_irq_to_el3 = env->cp15.scr_el3 & SCR_IRQ;
/* No need to include !IsSecure in route_*_to_el2 as it's only
* tested in cases where we know !IsSecure is true.
*/
route_fiq_to_el2 = env->cp15.hcr_el2 & HCR_FMO;
route_irq_to_el2 = env->cp15.hcr_el2 & HCR_FMO;
switch (arm_current_el(env)) {
case 3:
break;
case 2:
if (single_sec_state && irq_is_grp0 && !route_fiq_to_el3) {
break;
}
if (!irq_is_secure && !irq_is_grp0 && !route_irq_to_el3) {
break;
}
return;
case 1:
if (!arm_is_secure_below_el3(env)) {
if (single_sec_state && irq_is_grp0 &&
!route_fiq_to_el3 && !route_fiq_to_el2) {
break;
}
if (!irq_is_secure && !irq_is_grp0 &&
!route_irq_to_el3 && !route_irq_to_el2) {
break;
}
} else {
if (irq_is_grp0 && !route_fiq_to_el3) {
break;
}
if (!irq_is_grp0 &&
(!irq_is_secure || !single_sec_state) &&
!route_irq_to_el3) {
break;
}
}
return;
default:
g_assert_not_reached();
}
icc_deactivate_irq(cs, irq);
}
static uint64_t icc_rpr_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
GICv3CPUState *cs = icc_cs_from_env(env);
int prio = icc_highest_active_prio(cs);
if (arm_feature(env, ARM_FEATURE_EL3) &&
!arm_is_secure(env) && (env->cp15.scr_el3 & SCR_FIQ)) {
/* NS GIC access and Group 0 is inaccessible to NS */
if (prio & 0x80) {
/* NS mustn't see priorities in the Secure half of the range */
prio = 0;
} else if (prio != 0xff) {
/* Non-idle priority: show the Non-secure view of it */
prio = (prio << 1) & 0xff;
}
}
trace_gicv3_icc_rpr_read(gicv3_redist_affid(cs), prio);
return prio;
}
static void icc_generate_sgi(CPUARMState *env, GICv3CPUState *cs,
uint64_t value, int grp, bool ns)
{
@ -698,6 +1087,24 @@ static const ARMCPRegInfo gicv3_cpuif_reginfo[] = {
*/
.resetfn = icc_reset,
},
{ .name = "ICC_IAR0_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 8, .opc2 = 0,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_R, .accessfn = gicv3_fiq_access,
.readfn = icc_iar0_read,
},
{ .name = "ICC_EOIR0_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 8, .opc2 = 1,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_W, .accessfn = gicv3_fiq_access,
.writefn = icc_eoir_write,
},
{ .name = "ICC_HPPIR0_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 8, .opc2 = 2,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_R, .accessfn = gicv3_fiq_access,
.readfn = icc_hppir0_read,
},
{ .name = "ICC_BPR0_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 8, .opc2 = 3,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
@ -762,6 +1169,18 @@ static const ARMCPRegInfo gicv3_cpuif_reginfo[] = {
.readfn = icc_ap_read,
.writefn = icc_ap_write,
},
{ .name = "ICC_DIR_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 11, .opc2 = 1,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_W, .accessfn = gicv3_irqfiq_access,
.writefn = icc_dir_write,
},
{ .name = "ICC_RPR_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 11, .opc2 = 3,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_R, .accessfn = gicv3_irqfiq_access,
.readfn = icc_rpr_read,
},
{ .name = "ICC_SGI1R_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 11, .opc2 = 5,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
@ -798,6 +1217,24 @@ static const ARMCPRegInfo gicv3_cpuif_reginfo[] = {
.access = PL1_W, .accessfn = gicv3_irqfiq_access,
.writefn = icc_sgi0r_write,
},
{ .name = "ICC_IAR1_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 12, .opc2 = 0,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_R, .accessfn = gicv3_irq_access,
.readfn = icc_iar1_read,
},
{ .name = "ICC_EOIR1_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 12, .opc2 = 1,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_W, .accessfn = gicv3_irq_access,
.writefn = icc_eoir_write,
},
{ .name = "ICC_HPPIR1_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 12, .opc2 = 2,
.type = ARM_CP_IO | ARM_CP_NO_RAW,
.access = PL1_R, .accessfn = gicv3_irq_access,
.readfn = icc_hppir1_read,
},
/* This register is banked */
{ .name = "ICC_BPR1_EL1", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .opc1 = 0, .crn = 12, .crm = 12, .opc2 = 3,

View File

@ -159,6 +159,11 @@
#define ICC_CTLR_EL3_A3V (1U << 15)
#define ICC_CTLR_EL3_NDS (1U << 17)
/* Special interrupt IDs */
#define INTID_SECURE 1020
#define INTID_NONSECURE 1021
#define INTID_SPURIOUS 1023
/* Functions internal to the emulated GICv3 */
/**

View File

@ -2184,6 +2184,13 @@ gicv3_icc_ctlr_el3_write(uint32_t cpu, uint64_t val) "GICv3 ICC_CTLR_EL3 write c
gicv3_cpuif_update(uint32_t cpuid, int irq, int grp, int prio) "GICv3 CPU i/f %x HPPI update: irq %d group %d prio %d"
gicv3_cpuif_set_irqs(uint32_t cpuid, int fiqlevel, int irqlevel) "GICv3 CPU i/f %x HPPI update: setting FIQ %d IRQ %d"
gicv3_icc_generate_sgi(uint32_t cpuid, int irq, int irm, uint32_t aff, uint32_t targetlist) "GICv3 CPU i/f %x generating SGI %d IRM %d target affinity 0x%xxx targetlist 0x%x"
gicv3_icc_iar0_read(uint32_t cpu, uint64_t val) "GICv3 ICC_IAR0 read cpu %x value 0x%" PRIx64
gicv3_icc_iar1_read(uint32_t cpu, uint64_t val) "GICv3 ICC_IAR1 read cpu %x value 0x%" PRIx64
gicv3_icc_eoir_write(uint32_t cpu, uint64_t val) "GICv3 ICC_EOIR write cpu %x value 0x%" PRIx64
gicv3_icc_hppir0_read(uint32_t cpu, uint64_t val) "GICv3 ICC_HPPIR0 read cpu %x value 0x%" PRIx64
gicv3_icc_hppir1_read(uint32_t cpu, uint64_t val) "GICv3 ICC_HPPIR1 read cpu %x value 0x%" PRIx64
gicv3_icc_dir_write(uint32_t cpu, uint64_t val) "GICv3 ICC_DIR write cpu %x value 0x%" PRIx64
gicv3_icc_rpr_read(uint32_t cpu, uint64_t val) "GICv3 ICC_RPR read cpu %x value 0x%" PRIx64
# hw/intc/arm_gicv3_dist.c
gicv3_dist_read(uint64_t offset, uint64_t data, unsigned size, bool secure) "GICv3 distributor read: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u secure %d"