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irqchip/gic-v3: Add ESPI range support

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Add the required support for the ESPI range, which behave exactly like
the SPIs of old, only with new funky INTIDs.

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2019-07-16 15:17:31 +01:00
parent 8662465348
commit 211bddd210
2 changed files with 85 additions and 17 deletions
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85
drivers/irqchip/irq-gic-v3.c
View File

@ -51,13 +51,16 @@ struct gic_chip_data {
u32 nr_redist_regions;
u64 flags;
bool has_rss;
unsigned int irq_nr;
struct partition_desc *ppi_descs[16];
};
static struct gic_chip_data gic_data __read_mostly;
static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
#define GIC_ID_NR (1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
#define GIC_LINE_NR max(GICD_TYPER_SPIS(gic_data.rdists.gicd_typer), 1020U)
#define GIC_ESPI_NR GICD_TYPER_ESPIS(gic_data.rdists.gicd_typer)
/*
* The behaviours of RPR and PMR registers differ depending on the value of
* SCR_EL3.FIQ, and the behaviour of non-secure priority registers of the
@ -100,6 +103,7 @@ static DEFINE_PER_CPU(bool, has_rss);
enum gic_intid_range {
PPI_RANGE,
SPI_RANGE,
ESPI_RANGE,
LPI_RANGE,
__INVALID_RANGE__
};
@ -111,6 +115,8 @@ static enum gic_intid_range __get_intid_range(irq_hw_number_t hwirq)
return PPI_RANGE;
case 32 ... 1019:
return SPI_RANGE;
case ESPI_BASE_INTID ... (ESPI_BASE_INTID + 1023):
return ESPI_RANGE;
case 8192 ... GENMASK(23, 0):
return LPI_RANGE;
default:
@ -141,6 +147,7 @@ static inline void __iomem *gic_dist_base(struct irq_data *d)
return gic_data_rdist_sgi_base();
case SPI_RANGE:
case ESPI_RANGE:
/* SPI -> dist_base */
return gic_data.dist_base;
@ -234,6 +241,31 @@ static u32 convert_offset_index(struct irq_data *d, u32 offset, u32 *index)
case SPI_RANGE:
*index = d->hwirq;
return offset;
case ESPI_RANGE:
*index = d->hwirq - ESPI_BASE_INTID;
switch (offset) {
case GICD_ISENABLER:
return GICD_ISENABLERnE;
case GICD_ICENABLER:
return GICD_ICENABLERnE;
case GICD_ISPENDR:
return GICD_ISPENDRnE;
case GICD_ICPENDR:
return GICD_ICPENDRnE;
case GICD_ISACTIVER:
return GICD_ISACTIVERnE;
case GICD_ICACTIVER:
return GICD_ICACTIVERnE;
case GICD_IPRIORITYR:
return GICD_IPRIORITYRnE;
case GICD_ICFGR:
return GICD_ICFGRnE;
case GICD_IROUTER:
return GICD_IROUTERnE;
default:
break;
}
break;
default:
break;
}
@ -316,7 +348,7 @@ static int gic_irq_set_irqchip_state(struct irq_data *d,
{
u32 reg;
if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
if (d->hwirq >= 8192) /* PPI/SPI only */
return -EINVAL;
switch (which) {
@ -343,7 +375,7 @@ static int gic_irq_set_irqchip_state(struct irq_data *d,
static int gic_irq_get_irqchip_state(struct irq_data *d,
enum irqchip_irq_state which, bool *val)
{
if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
if (d->hwirq >= 8192) /* PPI/SPI only */
return -EINVAL;
switch (which) {
@ -567,7 +599,12 @@ static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs
gic_arch_enable_irqs();
}
if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) {
/* Check for special IDs first */
if ((irqnr >= 1020 && irqnr <= 1023))
return;
/* Treat anything but SGIs in a uniform way */
if (likely(irqnr > 15)) {
int err;
if (static_branch_likely(&supports_deactivate_key))
@ -655,10 +692,26 @@ static void __init gic_dist_init(void)
* do the right thing if the kernel is running in secure mode,
* but that's not the intended use case anyway.
*/
for (i = 32; i < gic_data.irq_nr; i += 32)
for (i = 32; i < GIC_LINE_NR; i += 32)
writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
/* Extended SPI range, not handled by the GICv2/GICv3 common code */
for (i = 0; i < GIC_ESPI_NR; i += 32) {
writel_relaxed(~0U, base + GICD_ICENABLERnE + i / 8);
writel_relaxed(~0U, base + GICD_ICACTIVERnE + i / 8);
}
for (i = 0; i < GIC_ESPI_NR; i += 32)
writel_relaxed(~0U, base + GICD_IGROUPRnE + i / 8);
for (i = 0; i < GIC_ESPI_NR; i += 16)
writel_relaxed(0, base + GICD_ICFGRnE + i / 4);
for (i = 0; i < GIC_ESPI_NR; i += 4)
writel_relaxed(GICD_INT_DEF_PRI_X4, base + GICD_IPRIORITYRnE + i);
/* Now do the common stuff, and wait for the distributor to drain */
gic_dist_config(base, GIC_LINE_NR, gic_dist_wait_for_rwp);
/* Enable distributor with ARE, Group1 */
writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1,
@ -669,8 +722,11 @@ static void __init gic_dist_init(void)
* enabled.
*/
affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
for (i = 32; i < gic_data.irq_nr; i++)
for (i = 32; i < GIC_LINE_NR; i++)
gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
for (i = 0; i < GIC_ESPI_NR; i++)
gic_write_irouter(affinity, base + GICD_IROUTERnE + i * 8);
}
static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
@ -1134,8 +1190,6 @@ static struct irq_chip gic_eoimode1_chip = {
IRQCHIP_MASK_ON_SUSPEND,
};
#define GIC_ID_NR (1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
@ -1153,6 +1207,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
break;
case SPI_RANGE:
case ESPI_RANGE:
irq_domain_set_info(d, irq, hw, chip, d->host_data,
handle_fasteoi_irq, NULL, NULL);
irq_set_probe(irq);
@ -1192,6 +1247,9 @@ static int gic_irq_domain_translate(struct irq_domain *d,
case GIC_IRQ_TYPE_PARTITION:
*hwirq = fwspec->param[1] + 16;
break;
case 2: /* ESPI */
*hwirq = fwspec->param[1] + ESPI_BASE_INTID;
break;
case GIC_IRQ_TYPE_LPI: /* LPI */
*hwirq = fwspec->param[1];
break;
@ -1346,7 +1404,6 @@ static int __init gic_init_bases(void __iomem *dist_base,
struct fwnode_handle *handle)
{
u32 typer;
int gic_irqs;
int err;
if (!is_hyp_mode_available())
@ -1363,15 +1420,11 @@ static int __init gic_init_bases(void __iomem *dist_base,
/*
* Find out how many interrupts are supported.
* The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
*/
typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
gic_data.rdists.gicd_typer = typer;
gic_irqs = GICD_TYPER_IRQS(typer);
if (gic_irqs > 1020)
gic_irqs = 1020;
gic_data.irq_nr = gic_irqs;
pr_info("%d SPIs implemented\n", GIC_LINE_NR - 32);
pr_info("%d Extended SPIs implemented\n", GIC_ESPI_NR);
gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
&gic_data);
irq_domain_update_bus_token(gic_data.domain, DOMAIN_BUS_WIRED);

17
include/linux/irqchip/arm-gic-v3.h
View File

@ -30,10 +30,22 @@
#define GICD_ICFGR 0x0C00
#define GICD_IGRPMODR 0x0D00
#define GICD_NSACR 0x0E00
#define GICD_IGROUPRnE 0x1000
#define GICD_ISENABLERnE 0x1200
#define GICD_ICENABLERnE 0x1400
#define GICD_ISPENDRnE 0x1600
#define GICD_ICPENDRnE 0x1800
#define GICD_ISACTIVERnE 0x1A00
#define GICD_ICACTIVERnE 0x1C00
#define GICD_IPRIORITYRnE 0x2000
#define GICD_ICFGRnE 0x3000
#define GICD_IROUTER 0x6000
#define GICD_IROUTERnE 0x8000
#define GICD_IDREGS 0xFFD0
#define GICD_PIDR2 0xFFE8
#define ESPI_BASE_INTID 4096
/*
* Those registers are actually from GICv2, but the spec demands that they
* are implemented as RES0 if ARE is 1 (which we do in KVM's emulated GICv3).
@ -69,10 +81,13 @@
#define GICD_TYPER_RSS (1U << 26)
#define GICD_TYPER_LPIS (1U << 17)
#define GICD_TYPER_MBIS (1U << 16)
#define GICD_TYPER_ESPI (1U << 8)
#define GICD_TYPER_ID_BITS(typer) ((((typer) >> 19) & 0x1f) + 1)
#define GICD_TYPER_NUM_LPIS(typer) ((((typer) >> 11) & 0x1f) + 1)
#define GICD_TYPER_IRQS(typer) ((((typer) & 0x1f) + 1) * 32)
#define GICD_TYPER_SPIS(typer) ((((typer) & 0x1f) + 1) * 32)
#define GICD_TYPER_ESPIS(typer) \
(((typer) & GICD_TYPER_ESPI) ? GICD_TYPER_SPIS((typer) >> 27) : 0)
#define GICD_IROUTER_SPI_MODE_ONE (0U << 31)
#define GICD_IROUTER_SPI_MODE_ANY (1U << 31)