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Message-ID: <20170329164705.GA11442@red-moon>
Date: Wed, 29 Mar 2017 17:47:05 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: fu.wei@...aro.org
Cc: rjw@...ysocki.net, lenb@...nel.org, daniel.lezcano@...aro.org,
tglx@...utronix.de, marc.zyngier@....com, mark.rutland@....com,
sudeep.holla@....com, hanjun.guo@...aro.org,
linux-arm-kernel@...ts.infradead.org, linaro-acpi@...ts.linaro.org,
linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
rruigrok@...eaurora.org, harba@...eaurora.org, cov@...eaurora.org,
timur@...eaurora.org, graeme.gregory@...aro.org,
al.stone@...aro.org, jcm@...hat.com, wei@...hat.com, arnd@...db.de,
catalin.marinas@....com, will.deacon@....com,
Suravee.Suthikulpanit@....com, leo.duran@....com, wim@...ana.be,
linux@...ck-us.net, linux-watchdog@...r.kernel.org,
tn@...ihalf.com, christoffer.dall@...aro.org, julien.grall@....com
Subject: Re: [PATCH v22 09/11] acpi/arm64: Add memory-mapped timer support in
GTDT driver
On Wed, Mar 22, 2017 at 12:31:20AM +0800, fu.wei@...aro.org wrote:
> From: Fu Wei <fu.wei@...aro.org>
>
> On platforms booting with ACPI, architected memory-mapped timers'
> configuration data is provided by firmware through the ACPI GTDT
> static table.
>
> The clocksource architected timer kernel driver requires a firmware
> interface to collect timer configuration and configure its driver.
> this infrastructure is present for device tree systems, but it is
> missing on systems booting with ACPI.
>
> Implement the kernel infrastructure required to parse the static
> ACPI GTDT table so that the architected timer clocksource driver can
> make use of it on systems booting with ACPI, therefore enabling
> the corresponding timers configuration.
>
> Signed-off-by: Fu Wei <fu.wei@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
> drivers/acpi/arm64/gtdt.c | 130 ++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/acpi.h | 1 +
> 2 files changed, 131 insertions(+)
>
> diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c
> index 8a03b4b..f471873 100644
> --- a/drivers/acpi/arm64/gtdt.c
> +++ b/drivers/acpi/arm64/gtdt.c
> @@ -37,6 +37,28 @@ struct acpi_gtdt_descriptor {
>
> static struct acpi_gtdt_descriptor acpi_gtdt_desc __initdata;
>
> +static inline void *next_platform_timer(void *platform_timer)
> +{
> + struct acpi_gtdt_header *gh = platform_timer;
> +
> + platform_timer += gh->length;
> + if (platform_timer < acpi_gtdt_desc.gtdt_end)
> + return platform_timer;
> +
> + return NULL;
> +}
> +
> +#define for_each_platform_timer(_g) \
> + for (_g = acpi_gtdt_desc.platform_timer; _g; \
> + _g = next_platform_timer(_g))
> +
> +static inline bool is_timer_block(void *platform_timer)
> +{
> + struct acpi_gtdt_header *gh = platform_timer;
> +
> + return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK;
> +}
> +
> static int __init map_gt_gsi(u32 interrupt, u32 flags)
> {
> int trigger, polarity;
> @@ -155,3 +177,111 @@ int __init acpi_gtdt_init(struct acpi_table_header *table,
>
> return ret;
> }
> +
> +static int __init gtdt_parse_timer_block(struct acpi_gtdt_timer_block *block,
> + struct arch_timer_mem *timer_mem)
> +{
> + int i, j;
> + struct acpi_gtdt_timer_entry *gtdt_frame;
> +
> + if (!block->timer_count) {
> + pr_err(FW_BUG "GT block present, but frame count is zero.");
> + return -ENODEV;
> + }
> +
> + if (block->timer_count > ARCH_TIMER_MEM_MAX_FRAMES) {
> + pr_err(FW_BUG "GT block lists %d frames, ACPI spec only allows 8\n",
> + block->timer_count);
> + return -EINVAL;
> + }
> +
> + timer_mem->cntctlbase = (phys_addr_t)block->block_address;
> + /*
> + * The CNTCTLBase frame is 4KB (register offsets 0x000 - 0xFFC).
> + * See ARM DDI 0487A.k_iss10775, page I1-5129, Table I1-3
> + * "CNTCTLBase memory map".
> + */
> + timer_mem->size = SZ_4K;
> +
> + gtdt_frame = (void *)block + block->timer_offset;
> + if (gtdt_frame + block->timer_count != (void *)block + block->header.length)
> + return -EINVAL;
> +
> + /*
> + * Get the GT timer Frame data for every GT Block Timer
> + */
> + for (i = 0, j = 0; i < block->timer_count; i++, gtdt_frame++) {
> + struct arch_timer_mem_frame *frame = &timer_mem->frame[j];
> +
> + if (gtdt_frame->common_flags & ACPI_GTDT_GT_IS_SECURE_TIMER)
> + continue;
> +
> + if (!gtdt_frame->base_address || !gtdt_frame->timer_interrupt)
> + return -EINVAL;
> +
> + frame->phys_irq = map_gt_gsi(gtdt_frame->timer_interrupt,
> + gtdt_frame->timer_flags);
> + if (frame->phys_irq <= 0) {
> + pr_warn("failed to map physical timer irq in frame %d.\n",
> + i);
> + return -EINVAL;
> + }
> +
> + frame->virt_irq =
> + map_gt_gsi(gtdt_frame->virtual_timer_interrupt,
> + gtdt_frame->virtual_timer_flags);
> + if (frame->virt_irq <= 0) {
> + pr_warn("failed to map virtual timer irq in frame %d.\n",
> + i);
> + acpi_unregister_gsi(gtdt_frame->timer_interrupt);
> + return -EINVAL;
> + }
> +
> + frame->frame_nr = gtdt_frame->frame_number;
> + frame->cntbase = gtdt_frame->base_address;
> + /*
> + * The CNTBaseN frame is 4KB (register offsets 0x000 - 0xFFC).
> + * See ARM DDI 0487A.k_iss10775, page I1-5130, Table I1-4
> + * "CNTBaseN memory map".
> + */
> + frame->size = SZ_4K;
> + j++;
> + }
> + timer_mem->num_frames = j;
> +
> + return 0;
> +}
> +
> +/**
> + * acpi_arch_timer_mem_init() - Get the info of all GT blocks in GTDT table.
> + * @timer_mem: the pointer to the array of struct arch_timer_mem for returning
> + * the result of parsing. The element number of this array should
> + * be platform_timer_count(the total number of platform timers).
> + * @count: The pointer of int variate for returning the number of GT
> + * blocks we have parsed.
Nit: this comment was wrong on all the patches I reviewed :) must be
some copy and paste.
> + *
> + * Return: 0 if success, -EINVAL/-ENODEV if error.
> + */
> +int __init acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem,
> + int *timer_count)
> +{
> + int ret;
> + void *platform_timer;
> +
> + *timer_count = 0;
> + for_each_platform_timer(platform_timer) {
> + if (is_timer_block(platform_timer)) {
> + ret = gtdt_parse_timer_block(platform_timer, timer_mem);
> + if (ret)
> + return ret;
Isn't there some unwinding to carry out here (eg GSI) ?
Otherwise it looks fine (minus Mark's request for using frame numbers
as indexes that you should change).
Lorenzo
> + timer_mem++;
> + (*timer_count)++;
> + }
> + }
> +
> + if (*timer_count)
> + pr_info("found %d memory-mapped timer block(s).\n",
> + *timer_count);
> +
> + return 0;
> +}
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 4b5c146..3193724 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -599,6 +599,7 @@ int acpi_reconfig_notifier_unregister(struct notifier_block *nb);
> int acpi_gtdt_init(struct acpi_table_header *table, int *platform_timer_count);
> int acpi_gtdt_map_ppi(int type);
> bool acpi_gtdt_c3stop(int type);
> +int acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem, int *timer_count);
> #endif
>
> #else /* !CONFIG_ACPI */
> --
> 2.9.3
>
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