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Re: [kvm-unit-tests PATCH v3 05/14] arm/arm64: ITS: Introspection tests
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From: |
Andrew Jones |
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Subject: |
Re: [kvm-unit-tests PATCH v3 05/14] arm/arm64: ITS: Introspection tests |
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Date: |
Fri, 7 Feb 2020 11:19:43 +0100 |
On Tue, Jan 28, 2020 at 11:34:50AM +0100, Eric Auger wrote:
> Detect the presence of an ITS as part of the GICv3 init
> routine, initialize its base address and read few registers
> the IIDR, the TYPER to store its dimensioning parameters.
> Also parse the BASER registers.
>
> This is our first ITS test, belonging to a new "its" group.
>
> Signed-off-by: Eric Auger <address@hidden>
>
> ---
>
> v2 -> v3:
> - updated dates and changed author
> - squash "arm/arm64: ITS: Test BASER" into this patch but
> removes setup_baser which will be introduced later.
> - only compile on aarch64
> - restrict the new test to aarch64
>
> v1 -> v2:
> - clean GITS_TYPER macros and unused fields in typer struct
> - remove memory attribute related macros
> - remove everything related to memory attributes
> - s/dev_baser/coll_baser/ in report_info
> - add extra line
> - removed index filed in its_baser
> ---
> arm/Makefile.arm64 | 1 +
> arm/gic.c | 49 ++++++++++++++++++
> arm/unittests.cfg | 7 +++
> lib/arm/asm/gic-v3-its.h | 103 +++++++++++++++++++++++++++++++++++++
> lib/arm/gic-v3-its.c | 88 +++++++++++++++++++++++++++++++
> lib/arm/gic.c | 30 +++++++++--
> lib/arm64/asm/gic-v3-its.h | 1 +
> 7 files changed, 274 insertions(+), 5 deletions(-)
> create mode 100644 lib/arm/asm/gic-v3-its.h
> create mode 100644 lib/arm/gic-v3-its.c
> create mode 100644 lib/arm64/asm/gic-v3-its.h
>
> diff --git a/arm/Makefile.arm64 b/arm/Makefile.arm64
> index 6d3dc2c..2571ffb 100644
> --- a/arm/Makefile.arm64
> +++ b/arm/Makefile.arm64
> @@ -19,6 +19,7 @@ endef
> cstart.o = $(TEST_DIR)/cstart64.o
> cflatobjs += lib/arm64/processor.o
> cflatobjs += lib/arm64/spinlock.o
> +cflatobjs += lib/arm/gic-v3-its.o
If gic-v3-its.c will never be compiled for arm, then it should
probably go lib/arm64, not lib/arm. Same comment for all other
new source and header files. The only problem with that is...
>
> OBJDIRS += lib/arm64
>
> diff --git a/arm/gic.c b/arm/gic.c
> index abf08c7..4d7dd03 100644
> --- a/arm/gic.c
> +++ b/arm/gic.c
> @@ -16,6 +16,7 @@
> #include <asm/processor.h>
> #include <asm/delay.h>
> #include <asm/gic.h>
> +#include <asm/gic-v3-its.h>
...here where we'd have to do
#if defined(__aarch64__)
#include <asm/gic-v3-its.h>
#endif
which is ugly. However that can be avoided by adding an
empty lib/arm/asm/gic-v3-its.h file.
> #include <asm/smp.h>
> #include <asm/barrier.h>
> #include <asm/io.h>
> @@ -518,6 +519,50 @@ static void gic_test_mmio(void)
> test_targets(nr_irqs);
> }
>
> +#if defined(__arm__)
> +
> +static void test_its_introspection(void) {}
static void test_its_introspection(void)
{
report_abort(...);
}
> +
> +#else /* __arch64__ */
> +
> +static void test_its_introspection(void)
> +{
> + struct its_baser *dev_baser, *coll_baser;
> + struct its_typer *typer = &its_data.typer;
> +
> + if (!gicv3_its_base()) {
> + report_skip("No ITS, skip ...");
> + return;
> + }
> +
> + /* IIDR */
> + report(test_readonly_32(gicv3_its_base() + GITS_IIDR, false),
> + "GITS_IIDR is read-only"),
> +
> + /* TYPER */
> + report(test_readonly_32(gicv3_its_base() + GITS_TYPER, false),
> + "GITS_TYPER is read-only");
> +
> + report(typer->phys_lpi, "ITS supports physical LPIs");
> + report_info("vLPI support: %s", typer->virt_lpi ? "yes" : "no");
> + report_info("ITT entry size = 0x%x", typer->ite_size);
> + report_info("Bit Count: EventID=%d DeviceId=%d CollId=%d",
> + typer->eventid_bits, typer->deviceid_bits,
> + typer->collid_bits);
> + report(typer->eventid_bits && typer->deviceid_bits &&
> + typer->collid_bits, "ID spaces");
> + report_info("Target address format %s",
> + typer->pta ? "Redist basse address" : "PE #");
> +
> + dev_baser = its_lookup_baser(GITS_BASER_TYPE_DEVICE);
> + coll_baser = its_lookup_baser(GITS_BASER_TYPE_COLLECTION);
> + report(dev_baser && coll_baser, "detect device and collection BASER");
> + report_info("device baser entry_size = 0x%x", dev_baser->esz);
> + report_info("collection baser entry_size = 0x%x", coll_baser->esz);
> +}
> +
> +#endif
> +
> int main(int argc, char **argv)
> {
> if (!gic_init()) {
> @@ -549,6 +594,10 @@ int main(int argc, char **argv)
> report_prefix_push(argv[1]);
> gic_test_mmio();
> report_prefix_pop();
> + } else if (strcmp(argv[1], "its-introspection") == 0) {
> + report_prefix_push(argv[1]);
> + test_its_introspection();
> + report_prefix_pop();
> } else {
> report_abort("Unknown subtest '%s'", argv[1]);
> }
> diff --git a/arm/unittests.cfg b/arm/unittests.cfg
> index daeb5a0..ba2b31b 100644
> --- a/arm/unittests.cfg
> +++ b/arm/unittests.cfg
> @@ -122,6 +122,13 @@ smp = $MAX_SMP
> extra_params = -machine gic-version=3 -append 'active'
> groups = gic
>
> +[its-introspection]
> +file = gic.flat
> +smp = $MAX_SMP
> +extra_params = -machine gic-version=3 -append 'its-introspection'
> +groups = its
> +arch = arm64
> +
> # Test PSCI emulation
> [psci]
> file = psci.flat
> diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h
> new file mode 100644
> index 0000000..815c515
> --- /dev/null
> +++ b/lib/arm/asm/gic-v3-its.h
> @@ -0,0 +1,103 @@
> +/*
> + * All ITS* defines are lifted from include/linux/irqchip/arm-gic-v3.h
> + *
> + * Copyright (C) 2020, Red Hat Inc, Eric Auger <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU LGPL, version 2.
> + */
> +#ifndef _ASMARM_GIC_V3_ITS_H_
> +#define _ASMARM_GIC_V3_ITS_H_
> +
> +#ifndef __ASSEMBLY__
Doesn't look like you use the #else /* __ASSEMBLY__ */ side of this.
I'd leave out the #ifndef until we add defines we need to access
from assembler.
> +
> +struct its_typer {
> + unsigned int ite_size;
> + unsigned int eventid_bits;
> + unsigned int deviceid_bits;
> + unsigned int collid_bits;
> + bool pta;
> + bool phys_lpi;
> + bool virt_lpi;
> +};
> +
> +struct its_baser {
> + int type;
> + size_t psz;
> + int nr_pages;
> + bool indirect;
> + phys_addr_t table_addr;
> + bool valid;
> + int esz;
> +};
> +
> +#define GITS_BASER_NR_REGS 8
> +
> +struct its_data {
> + void *base;
> + struct its_typer typer;
> + struct its_baser baser[GITS_BASER_NR_REGS];
> +};
> +
> +extern struct its_data its_data;
> +
> +#define gicv3_its_base() (its_data.base)
> +
> +#if defined(__aarch64__)
> +
> +#define GITS_CTLR 0x0000
> +#define GITS_IIDR 0x0004
> +#define GITS_TYPER 0x0008
> +#define GITS_CBASER 0x0080
> +#define GITS_CWRITER 0x0088
> +#define GITS_CREADR 0x0090
> +#define GITS_BASER 0x0100
> +
> +#define GITS_TYPER_PLPIS BIT(0)
> +#define GITS_TYPER_VLPIS BIT(1)
> +#define GITS_TYPER_ITT_ENTRY_SIZE GENMASK_ULL(7, 4)
> +#define GITS_TYPER_ITT_ENTRY_SIZE_SHIFT 4
> +#define GITS_TYPER_IDBITS GENMASK_ULL(8, 12)
> +#define GITS_TYPER_IDBITS_SHIFT 8
> +#define GITS_TYPER_DEVBITS GENMASK_ULL(13, 17)
> +#define GITS_TYPER_DEVBITS_SHIFT 13
> +#define GITS_TYPER_PTA BIT(19)
> +#define GITS_TYPER_CIDBITS GENMASK_ULL(32, 35)
> +#define GITS_TYPER_CIDBITS_SHIFT 32
> +#define GITS_TYPER_CIL BIT(36)
> +
> +#define GITS_CTLR_ENABLE (1U << 0)
> +
> +#define GITS_CBASER_VALID (1UL << 63)
> +
> +#define GITS_BASER_VALID BIT(63)
> +#define GITS_BASER_INDIRECT BIT(62)
> +#define GITS_BASER_TYPE_SHIFT (56)
> +#define GITS_BASER_TYPE(r) (((r) >> GITS_BASER_TYPE_SHIFT) & 7)
> +#define GITS_BASER_ENTRY_SIZE_SHIFT (48)
> +#define GITS_BASER_ENTRY_SIZE(r) ((((r) >> GITS_BASER_ENTRY_SIZE_SHIFT)
> & 0x1f) + 1)
> +#define GITS_BASER_PAGE_SIZE_SHIFT (8)
> +#define GITS_BASER_PAGE_SIZE_4K (0UL <<
> GITS_BASER_PAGE_SIZE_SHIFT)
> +#define GITS_BASER_PAGE_SIZE_16K (1UL << GITS_BASER_PAGE_SIZE_SHIFT)
> +#define GITS_BASER_PAGE_SIZE_64K (2UL << GITS_BASER_PAGE_SIZE_SHIFT)
> +#define GITS_BASER_PAGE_SIZE_MASK (3UL << GITS_BASER_PAGE_SIZE_SHIFT)
> +#define GITS_BASER_PAGES_MAX 256
> +#define GITS_BASER_PAGES_SHIFT (0)
> +#define GITS_BASER_NR_PAGES(r) (((r) & 0xff) + 1)
> +#define GITS_BASER_PHYS_ADDR_MASK 0xFFFFFFFFF000
> +#define GITS_BASER_TYPE_NONE 0
> +#define GITS_BASER_TYPE_DEVICE 1
> +#define GITS_BASER_TYPE_COLLECTION 4
> +
> +extern void its_parse_typer(void);
> +extern void its_init(void);
> +extern int its_parse_baser(int i, struct its_baser *baser);
> +extern struct its_baser *its_lookup_baser(int type);
> +
> +#else /* __arm__ */
> +
> +static inline void its_init(void) {}
Looks like the empty gic-v3-its.h I suggested creating above will actually
be useful. We can add stubs like this in it.
> +
> +#endif
> +
> +#endif /* !__ASSEMBLY__ */
> +#endif /* _ASMARM_GIC_V3_ITS_H_ */
> diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c
> new file mode 100644
> index 0000000..2c0ce13
> --- /dev/null
> +++ b/lib/arm/gic-v3-its.c
> @@ -0,0 +1,88 @@
> +/*
> + * Copyright (C) 2020, Red Hat Inc, Eric Auger <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU LGPL, version 2.
> + */
> +#include <asm/gic.h>
> +#include <alloc_page.h>
> +#include <asm/gic-v3-its.h>
> +
> +void its_parse_typer(void)
> +{
> + u64 typer = readq(gicv3_its_base() + GITS_TYPER);
> +
> + its_data.typer.ite_size = ((typer & GITS_TYPER_ITT_ENTRY_SIZE) >>
> + GITS_TYPER_ITT_ENTRY_SIZE_SHIFT) + 1;
> + its_data.typer.pta = typer & GITS_TYPER_PTA;
> + its_data.typer.eventid_bits = ((typer & GITS_TYPER_IDBITS) >>
> + GITS_TYPER_IDBITS_SHIFT) + 1;
> + its_data.typer.deviceid_bits = ((typer & GITS_TYPER_DEVBITS) >>
> + GITS_TYPER_DEVBITS_SHIFT) + 1;
> +
> + if (typer & GITS_TYPER_CIL)
> + its_data.typer.collid_bits = ((typer & GITS_TYPER_CIDBITS) >>
> + GITS_TYPER_CIDBITS_SHIFT) + 1;
nit: please consider aligning like this
((typer & MASK) >>
SHIFT) + 1;
Or, maybe better to macro it
#define TYPER_FIELD(typer, mask, shift) (((type) & (mask) >> (shift)) + 1)
And, rather than have a bunch of 'its_data.typer's we could use an alias,
helping us stay within 120 chars.
struct its_typer *t = &its_data.typer;
t->ite_size = TYPER_FIELD(typer, GITS_TYPER_ITT_ENTRY_SIZE,
GITS_TYPER_ITT_ENTRY_SIZE_SHIFT);
> + else
> + its_data.typer.collid_bits = 16;
> +
> + its_data.typer.virt_lpi = typer & GITS_TYPER_VLPIS;
> + its_data.typer.phys_lpi = typer & GITS_TYPER_PLPIS;
> +}
> +
> +int its_parse_baser(int i, struct its_baser *baser)
> +{
> + void *reg_addr = gicv3_its_base() + GITS_BASER + i * 8;
> + u64 val = readq(reg_addr);
> +
> + if (!val) {
> + memset(baser, 0, sizeof(*baser));
> + return -1;
> + }
> +
> + baser->valid = val & GITS_BASER_VALID;
> + baser->indirect = val & GITS_BASER_INDIRECT;
> + baser->type = GITS_BASER_TYPE(val);
> + baser->esz = GITS_BASER_ENTRY_SIZE(val);
> + baser->nr_pages = GITS_BASER_NR_PAGES(val);
> + baser->table_addr = val & GITS_BASER_PHYS_ADDR_MASK;
> + switch (val & GITS_BASER_PAGE_SIZE_MASK) {
> + case GITS_BASER_PAGE_SIZE_4K:
> + baser->psz = SZ_4K;
> + break;
> + case GITS_BASER_PAGE_SIZE_16K:
> + baser->psz = SZ_16K;
> + break;
> + case GITS_BASER_PAGE_SIZE_64K:
> + baser->psz = SZ_64K;
> + break;
> + default:
> + baser->psz = SZ_64K;
> + }
> + return 0;
> +}
> +
> +struct its_baser *its_lookup_baser(int type)
> +{
> + int i;
> +
> + for (i = 0; i < GITS_BASER_NR_REGS; i++) {
> + struct its_baser *baser = &its_data.baser[i];
> +
> + if (baser->type == type)
> + return baser;
> + }
> + return NULL;
> +}
> +
> +void its_init(void)
> +{
> + int i;
> +
> + if (!its_data.base)
> + return;
> +
> + its_parse_typer();
> + for (i = 0; i < GITS_BASER_NR_REGS; i++)
> + its_parse_baser(i, &its_data.baser[i]);
> +}
> +
> diff --git a/lib/arm/gic.c b/lib/arm/gic.c
> index aa9cb86..6b70b05 100644
> --- a/lib/arm/gic.c
> +++ b/lib/arm/gic.c
> @@ -6,9 +6,11 @@
> #include <devicetree.h>
> #include <asm/gic.h>
> #include <asm/io.h>
> +#include <asm/gic-v3-its.h>
>
> struct gicv2_data gicv2_data;
> struct gicv3_data gicv3_data;
> +struct its_data its_data;
>
> struct gic_common_ops {
> void (*enable_defaults)(void);
> @@ -44,12 +46,13 @@ static const struct gic_common_ops gicv3_common_ops = {
> * Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
> */
> static bool
> -gic_get_dt_bases(const char *compatible, void **base1, void **base2)
> +gic_get_dt_bases(const char *compatible, void **base1, void **base2, void
> **base3)
> {
> struct dt_pbus_reg reg;
> - struct dt_device gic;
> + struct dt_device gic, its;
> struct dt_bus bus;
> - int node, ret, i;
> + int node, subnode, ret, i, len;
> + const void *fdt = dt_fdt();
>
> dt_bus_init_defaults(&bus);
> dt_device_init(&gic, &bus, NULL);
> @@ -74,19 +77,35 @@ gic_get_dt_bases(const char *compatible, void **base1,
> void **base2)
> base2[i] = ioremap(reg.addr, reg.size);
> }
>
> + if (base3 && !strcmp(compatible, "arm,gic-v3")) {
If base != NULL, then we could assert(strcmp(compatible, "arm,cortex-a15-gic")
!= 0)
> + dt_for_each_subnode(node, subnode) {
> + const struct fdt_property *prop;
> +
> + prop = fdt_get_property(fdt, subnode, "compatible",
> &len);
> + if (!strcmp((char *)prop->data, "arm,gic-v3-its")) {
> + dt_device_bind_node(&its, subnode);
> + ret = dt_pbus_translate(&its, 0, ®);
> + assert(ret == 0);
> + *base3 = ioremap(reg.addr, reg.size);
> + break;
> + }
> + }
> +
> + }
> +
> return true;
> }
>
> int gicv2_init(void)
> {
> return gic_get_dt_bases("arm,cortex-a15-gic",
> - &gicv2_data.dist_base, &gicv2_data.cpu_base);
> + &gicv2_data.dist_base, &gicv2_data.cpu_base, NULL);
> }
>
> int gicv3_init(void)
> {
> return gic_get_dt_bases("arm,gic-v3", &gicv3_data.dist_base,
> - &gicv3_data.redist_bases[0]);
> + &gicv3_data.redist_bases[0], &its_data.base);
> }
>
> int gic_version(void)
> @@ -104,6 +123,7 @@ int gic_init(void)
> gic_common_ops = &gicv2_common_ops;
> else if (gicv3_init())
> gic_common_ops = &gicv3_common_ops;
> + its_init();
> return gic_version();
> }
>
> diff --git a/lib/arm64/asm/gic-v3-its.h b/lib/arm64/asm/gic-v3-its.h
> new file mode 100644
> index 0000000..083cba4
> --- /dev/null
> +++ b/lib/arm64/asm/gic-v3-its.h
> @@ -0,0 +1 @@
> +#include "../../arm/asm/gic-v3-its.h"
> --
> 2.20.1
>
Thanks,
drew