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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v6 03/36] ARM: GICv3: allocate LPI pending and property table
Hi Andre, On 07/04/17 18:32, Andre Przywara wrote: The ARM GICv3 provides a new kind of interrupt called LPIs. The pending bits and the configuration data (priority, enable bits) for those LPIs are stored in tables in normal memory, which software has to provide to the hardware. Allocate the required memory, initialize it and hand it over to each redistributor. The maximum number of LPIs to be used can be adjusted with the command line option "max_lpi_bits", which defaults to 20 bits, covering about one million LPIs. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> Reviewed-by: Julien Grall <julien.grall@xxxxxxx> Cheers, --- docs/misc/xen-command-line.markdown | 9 ++ xen/arch/arm/Makefile | 1 + xen/arch/arm/gic-v3-lpi.c | 227 ++++++++++++++++++++++++++++++++++++ xen/arch/arm/gic-v3.c | 17 +++ xen/include/asm-arm/gic_v3_defs.h | 52 +++++++++ xen/include/asm-arm/gic_v3_its.h | 15 ++- xen/include/asm-arm/irq.h | 8 ++ 7 files changed, 328 insertions(+), 1 deletion(-) create mode 100644 xen/arch/arm/gic-v3-lpi.c diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown index 4c8fe2f..450b222 100644 --- a/docs/misc/xen-command-line.markdown +++ b/docs/misc/xen-command-line.markdown @@ -1172,6 +1172,15 @@ based interrupts. Any higher IRQs will be available for use via PCI MSI. ### maxcpus > `= <integer>` +### max\_lpi\_bits +> `= <integer>` + +Specifies the number of ARM GICv3 LPI interrupts to allocate on the host, +presented as the number of bits needed to encode it. This must be at least +14 and not exceed 32, and each LPI requires one byte (configuration) and +one pending bit to be allocated. +Defaults to 20 bits (to cover at most 1048576 interrupts). + ### mce > `= <integer>` diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile index 39c0a03..6be85ab 100644 --- a/xen/arch/arm/Makefile +++ b/xen/arch/arm/Makefile @@ -19,6 +19,7 @@ obj-y += gic.o obj-y += gic-v2.o obj-$(CONFIG_HAS_GICV3) += gic-v3.o obj-$(CONFIG_HAS_ITS) += gic-v3-its.o +obj-$(CONFIG_HAS_ITS) += gic-v3-lpi.o obj-y += guestcopy.o obj-y += hvm.o obj-y += io.o diff --git a/xen/arch/arm/gic-v3-lpi.c b/xen/arch/arm/gic-v3-lpi.c new file mode 100644 index 0000000..27e9bf5 --- /dev/null +++ b/xen/arch/arm/gic-v3-lpi.c @@ -0,0 +1,227 @@ +/* + * xen/arch/arm/gic-v3-lpi.c + * + * ARM GICv3 Locality-specific Peripheral Interrupts (LPI) support + * + * Copyright (C) 2016,2017 - ARM Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; under version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; If not, see <http://www.gnu.org/licenses/>. + */ + +#include <xen/lib.h> +#include <xen/mm.h> +#include <xen/sizes.h> +#include <xen/warning.h> +#include <asm/gic.h> +#include <asm/gic_v3_defs.h> +#include <asm/gic_v3_its.h> +#include <asm/io.h> +#include <asm/page.h> + +#define LPI_PROPTABLE_NEEDS_FLUSHING (1U << 0) + +/* Global state */ +static struct { + /* The global LPI property table, shared by all redistributors. */ + uint8_t *lpi_property; + /* + * Number of physical LPIs the host supports. This is a property of + * the GIC hardware. We depart from the habit of naming these things + * "physical" in Xen, as the GICv3/4 spec uses the term "physical LPI" + * in a different context to differentiate them from "virtual LPIs". + */ + unsigned long int max_host_lpi_ids; + unsigned int flags; +} lpi_data; + +struct lpi_redist_data { + void *pending_table; +}; + +static DEFINE_PER_CPU(struct lpi_redist_data, lpi_redist); + +#define MAX_NR_HOST_LPIS (lpi_data.max_host_lpi_ids - LPI_OFFSET) + +static int gicv3_lpi_allocate_pendtable(uint64_t *reg) +{ + uint64_t val; + void *pendtable; + + if ( this_cpu(lpi_redist).pending_table ) + return -EBUSY; + + val = GIC_BASER_CACHE_RaWaWb << GICR_PENDBASER_INNER_CACHEABILITY_SHIFT; + val |= GIC_BASER_CACHE_SameAsInner << GICR_PENDBASER_OUTER_CACHEABILITY_SHIFT; + val |= GIC_BASER_InnerShareable << GICR_PENDBASER_SHAREABILITY_SHIFT; + + /* + * The pending table holds one bit per LPI and even covers bits for + * interrupt IDs below 8192, so we allocate the full range. + * The GICv3 imposes a 64KB alignment requirement, also requires + * physically contiguous memory. + */ + pendtable = _xzalloc(lpi_data.max_host_lpi_ids / 8, SZ_64K); + if ( !pendtable ) + return -ENOMEM; + + /* Make sure the physical address can be encoded in the register. */ + if ( virt_to_maddr(pendtable) & ~GENMASK(51, 16) ) + { + xfree(pendtable); + return -ERANGE; + } + clean_and_invalidate_dcache_va_range(pendtable, + lpi_data.max_host_lpi_ids / 8); + + this_cpu(lpi_redist).pending_table = pendtable; + + val |= GICR_PENDBASER_PTZ; + + val |= virt_to_maddr(pendtable); + + *reg = val; + + return 0; +} + +/* + * Tell a redistributor about the (shared) property table, allocating one + * if not already done. + */ +static int gicv3_lpi_set_proptable(void __iomem * rdist_base) +{ + uint64_t reg; + + reg = GIC_BASER_CACHE_RaWaWb << GICR_PROPBASER_INNER_CACHEABILITY_SHIFT; + reg |= GIC_BASER_CACHE_SameAsInner << GICR_PROPBASER_OUTER_CACHEABILITY_SHIFT; + reg |= GIC_BASER_InnerShareable << GICR_PROPBASER_SHAREABILITY_SHIFT; + + /* + * The property table is shared across all redistributors, so allocate + * this only once, but return the same value on subsequent calls. + */ + if ( !lpi_data.lpi_property ) + { + /* The property table holds one byte per LPI. */ + void *table = _xmalloc(lpi_data.max_host_lpi_ids, SZ_4K); + + if ( !table ) + return -ENOMEM; + + /* Make sure the physical address can be encoded in the register. */ + if ( (virt_to_maddr(table) & ~GENMASK(51, 12)) ) + { + xfree(table); + return -ERANGE; + } + memset(table, GIC_PRI_IRQ | LPI_PROP_RES1, MAX_NR_HOST_LPIS); + clean_and_invalidate_dcache_va_range(table, MAX_NR_HOST_LPIS); + lpi_data.lpi_property = table; + } + + /* Encode the number of bits needed, minus one */ + reg |= fls(lpi_data.max_host_lpi_ids - 1) - 1; + + reg |= virt_to_maddr(lpi_data.lpi_property); + + writeq_relaxed(reg, rdist_base + GICR_PROPBASER); + reg = readq_relaxed(rdist_base + GICR_PROPBASER); + + /* If we can't do shareable, we have to drop cacheability as well. */ + if ( !(reg & GICR_PROPBASER_SHAREABILITY_MASK) ) + { + reg &= ~GICR_PROPBASER_INNER_CACHEABILITY_MASK; + reg |= GIC_BASER_CACHE_nC << GICR_PROPBASER_INNER_CACHEABILITY_SHIFT; + } + + /* Remember that we have to flush the property table if non-cacheable. */ + if ( (reg & GICR_PROPBASER_INNER_CACHEABILITY_MASK) <= GIC_BASER_CACHE_nC ) + { + lpi_data.flags |= LPI_PROPTABLE_NEEDS_FLUSHING; + /* Update the redistributors knowledge about the attributes. */ + writeq_relaxed(reg, rdist_base + GICR_PROPBASER); + } + + return 0; +} + +int gicv3_lpi_init_rdist(void __iomem * rdist_base) +{ + uint32_t reg; + uint64_t table_reg; + int ret; + + /* We don't support LPIs without an ITS. */ + if ( !gicv3_its_host_has_its() ) + return -ENODEV; + + /* Make sure LPIs are disabled before setting up the tables. */ + reg = readl_relaxed(rdist_base + GICR_CTLR); + if ( reg & GICR_CTLR_ENABLE_LPIS ) + return -EBUSY; + + ret = gicv3_lpi_allocate_pendtable(&table_reg); + if ( ret ) + return ret; + writeq_relaxed(table_reg, rdist_base + GICR_PENDBASER); + table_reg = readq_relaxed(rdist_base + GICR_PENDBASER); + + /* If the hardware reports non-shareable, drop cacheability as well. */ + if ( !(table_reg & GICR_PENDBASER_SHAREABILITY_MASK) ) + { + table_reg &= GICR_PENDBASER_SHAREABILITY_MASK; + table_reg &= GICR_PENDBASER_INNER_CACHEABILITY_MASK; + table_reg |= GIC_BASER_CACHE_nC << GICR_PENDBASER_INNER_CACHEABILITY_SHIFT; + + writeq_relaxed(table_reg, rdist_base + GICR_PENDBASER); + } + + return gicv3_lpi_set_proptable(rdist_base); +} + +static unsigned int max_lpi_bits = 20; +integer_param("max_lpi_bits", max_lpi_bits); + +int gicv3_lpi_init_host_lpis(unsigned int host_lpi_bits) +{ + /* + * An implementation needs to support at least 14 bits of LPI IDs. + * Tell the user about it, the actual number is reported below. + */ + if ( max_lpi_bits < 14 || max_lpi_bits > 32 ) + printk(XENLOG_WARNING "WARNING: max_lpi_bits must be between 14 and 32, adjusting.\n"); + + max_lpi_bits = max(max_lpi_bits, 14U); + lpi_data.max_host_lpi_ids = BIT(min(host_lpi_bits, max_lpi_bits)); + + /* + * Warn if the number of LPIs are quite high, as the user might not want + * to waste megabytes of memory for a mostly empty table. + * It's very unlikely that we need more than 24 bits worth of LPIs. + */ + if ( lpi_data.max_host_lpi_ids > BIT(24) ) + warning_add("Using high number of LPIs, limit memory usage with max_lpi_bits\n"); + + printk("GICv3: using at most %lu LPIs on the host.\n", MAX_NR_HOST_LPIS); + + return 0; +} + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */ diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c index d3d5784..54d2235 100644 --- a/xen/arch/arm/gic-v3.c +++ b/xen/arch/arm/gic-v3.c @@ -547,6 +547,9 @@ static void __init gicv3_dist_init(void) type = readl_relaxed(GICD + GICD_TYPER); nr_lines = 32 * ((type & GICD_TYPE_LINES) + 1); + if ( type & GICD_TYPE_LPIS ) + gicv3_lpi_init_host_lpis(GICD_TYPE_ID_BITS(type)); + printk("GICv3: %d lines, (IID %8.8x).\n", nr_lines, readl_relaxed(GICD + GICD_IIDR)); @@ -659,6 +662,20 @@ static int __init gicv3_populate_rdist(void) if ( (typer >> 32) == aff ) { this_cpu(rbase) = ptr; + + if ( typer & GICR_TYPER_PLPIS ) + { + int ret; + + ret = gicv3_lpi_init_rdist(ptr); + if ( ret && ret != -ENODEV ) + { + printk("GICv3: CPU%d: Cannot initialize LPIs: %u\n", + smp_processor_id(), ret); + break; + } + } + printk("GICv3: CPU%d: Found redistributor in region %d @%p\n", smp_processor_id(), i, ptr); return 0; diff --git a/xen/include/asm-arm/gic_v3_defs.h b/xen/include/asm-arm/gic_v3_defs.h index 6bd25a5..2792ffd 100644 --- a/xen/include/asm-arm/gic_v3_defs.h +++ b/xen/include/asm-arm/gic_v3_defs.h @@ -45,6 +45,9 @@ /* Additional bits in GICD_TYPER defined by GICv3 */ #define GICD_TYPE_ID_BITS_SHIFT 19 +#define GICD_TYPE_ID_BITS(r) ((((r) >> GICD_TYPE_ID_BITS_SHIFT) & 0x1f) + 1) + +#define GICD_TYPE_LPIS (1U << 17) #define GICD_CTLR_RWP (1UL << 31) #define GICD_CTLR_ARE_NS (1U << 4) @@ -95,12 +98,61 @@ #define GICR_IGRPMODR0 (0x0D00) #define GICR_NSACR (0x0E00) +#define GICR_CTLR_ENABLE_LPIS (1U << 0) + #define GICR_TYPER_PLPIS (1U << 0) #define GICR_TYPER_VLPIS (1U << 1) #define GICR_TYPER_LAST (1U << 4) +/* For specifying the inner cacheability type only */ +#define GIC_BASER_CACHE_nCnB 0ULL +/* For specifying the outer cacheability type only */ +#define GIC_BASER_CACHE_SameAsInner 0ULL +#define GIC_BASER_CACHE_nC 1ULL +#define GIC_BASER_CACHE_RaWt 2ULL +#define GIC_BASER_CACHE_RaWb 3ULL +#define GIC_BASER_CACHE_WaWt 4ULL +#define GIC_BASER_CACHE_WaWb 5ULL +#define GIC_BASER_CACHE_RaWaWt 6ULL +#define GIC_BASER_CACHE_RaWaWb 7ULL +#define GIC_BASER_CACHE_MASK 7ULL + +#define GIC_BASER_NonShareable 0ULL +#define GIC_BASER_InnerShareable 1ULL +#define GIC_BASER_OuterShareable 2ULL + +#define GICR_PROPBASER_OUTER_CACHEABILITY_SHIFT 56 +#define GICR_PROPBASER_OUTER_CACHEABILITY_MASK \ + (7UL << GICR_PROPBASER_OUTER_CACHEABILITY_SHIFT) +#define GICR_PROPBASER_SHAREABILITY_SHIFT 10 +#define GICR_PROPBASER_SHAREABILITY_MASK \ + (3UL << GICR_PROPBASER_SHAREABILITY_SHIFT) +#define GICR_PROPBASER_INNER_CACHEABILITY_SHIFT 7 +#define GICR_PROPBASER_INNER_CACHEABILITY_MASK \ + (7UL << GICR_PROPBASER_INNER_CACHEABILITY_SHIFT) +#define GICR_PROPBASER_RES0_MASK \ + (GENMASK(63, 59) | GENMASK(55, 52) | GENMASK(6, 5)) + +#define GICR_PENDBASER_SHAREABILITY_SHIFT 10 +#define GICR_PENDBASER_INNER_CACHEABILITY_SHIFT 7 +#define GICR_PENDBASER_OUTER_CACHEABILITY_SHIFT 56 +#define GICR_PENDBASER_SHAREABILITY_MASK \ + (3UL << GICR_PENDBASER_SHAREABILITY_SHIFT) +#define GICR_PENDBASER_INNER_CACHEABILITY_MASK \ + (7UL << GICR_PENDBASER_INNER_CACHEABILITY_SHIFT) +#define GICR_PENDBASER_OUTER_CACHEABILITY_MASK \ + (7UL << GICR_PENDBASER_OUTER_CACHEABILITY_SHIFT) +#define GICR_PENDBASER_PTZ BIT(62) +#define GICR_PENDBASER_RES0_MASK \ + (BIT(63) | GENMASK(61, 59) | GENMASK(55, 52) | \ + GENMASK(15, 12) | GENMASK(6, 0)) + #define DEFAULT_PMR_VALUE 0xff +#define LPI_PROP_PRIO_MASK 0xfc +#define LPI_PROP_RES1 (1 << 1) +#define LPI_PROP_ENABLED (1 << 0) + #define GICH_VMCR_EOI (1 << 9) #define GICH_VMCR_VENG1 (1 << 1) diff --git a/xen/include/asm-arm/gic_v3_its.h b/xen/include/asm-arm/gic_v3_its.h index 880904d..d1382c1 100644 --- a/xen/include/asm-arm/gic_v3_its.h +++ b/xen/include/asm-arm/gic_v3_its.h @@ -76,7 +76,10 @@ void gicv3_its_dt_init(const struct dt_device_node *node); bool gicv3_its_host_has_its(void); -/* Initialize the host structures for the host ITSes. */ +int gicv3_lpi_init_rdist(void __iomem * rdist_base); + +/* Initialize the host structures for LPIs and the host ITSes. */ +int gicv3_lpi_init_host_lpis(unsigned int host_lpi_bits); int gicv3_its_init(void); #else @@ -90,6 +93,16 @@ static inline bool gicv3_its_host_has_its(void) return false; } +static inline int gicv3_lpi_init_rdist(void __iomem * rdist_base) +{ + return -ENODEV; +} + +static inline int gicv3_lpi_init_host_lpis(unsigned int host_lpi_bits) +{ + return 0; +} + static inline int gicv3_its_init(void) { return 0; diff --git a/xen/include/asm-arm/irq.h b/xen/include/asm-arm/irq.h index 4849f16..f940092 100644 --- a/xen/include/asm-arm/irq.h +++ b/xen/include/asm-arm/irq.h @@ -18,8 +18,16 @@ struct arch_irq_desc { }; #define NR_LOCAL_IRQS 32 + +/* + * This only covers the interrupts that Xen cares about, so SGIs, PPIs and + * SPIs. LPIs are too numerous, also only propagated to guests, so they are + * not included in this number. + */ #define NR_IRQS 1024 +#define LPI_OFFSET 8192 + #define nr_irqs NR_IRQS #define nr_static_irqs NR_IRQS #define arch_hwdom_irqs(domid) NR_IRQS -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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