From: Fu Wei fu.wei@linaro.org
This patchset: (1)Preparation for adding GTDT support in arm_arch_timer: 1. Move some enums and marcos to header file; 2. Add a new enum for spi type; 3. Improve printk relevant code; 4. Rename some enums and defines; 5. Rework PPI determination; 6. Rework counter frequency detection; 7. Refactor arch_timer_needs_probing, move it into DT init call 8. Introduce some new structs and refactor the MMIO timer init code for reusing some common code.
(2)Introduce ACPI GTDT parser: drivers/acpi/arm64/acpi_gtdt.c Parse all kinds of timer in GTDT table of ACPI:arch timer, memory-mapped timer and SBSA Generic Watchdog timer. This driver can help to simplify all the relevant timer drivers, and separate all the ACPI GTDT knowledge from them.
(3)Simplify ACPI code for arm_arch_timer
(4)Add GTDT support for ARM memory-mapped timer.
This patchset has been tested on the following platforms with ACPI enabled: (1)ARM Foundation v8 model
Changelog: v17: https://lkml.org/lkml/2016/11/25/ Take out some cleanups from 4/15. Merge 5/15 and 6/15, improve PPI determination code, improve commit message. Rework counter frequency detection. Move arch_timer_needs_of_probing into DT init call. Move Platform Timer scan loop back to timer init call to avoid allocating and free memory. Improve all the exported functions' comment.
v16: https://lkml.org/lkml/2016/11/16/268 Fix patchset problem about static enum ppi_nr of 01/13 in v15. Refactor arch_timer_detect_rate. Refactor arch_timer_needs_probing.
v15: https://lkml.org/lkml/2016/11/15/366 Re-order patches Add arm_arch_timer refactoring patches to prepare for GTDT: 1. rename some enums and defines, and some cleanups 2. separate out arch_timer_uses_ppi init code and fix a potential bug 3. Improve some new structs, refactor the timer init code. Since the some structs have been changed, GTDT parser for memory-mapped timer and SBSA Generic Watchdog timer have been update.
v14: https://lkml.org/lkml/2016/9/28/573 Separate memory-mapped timer GTDT support into two patches 1. Refactor the timer init code to prepare for GTDT 2. Add GTDT support for memory-mapped timer
v13: http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1231717.html Improve arm_arch_timer code for memory-mapped timer GTDT support, refactor original memory-mapped timer dt support for reusing some common code.
v12: https://lkml.org/lkml/2016/9/13/250 Rebase to latest Linux 4.8-rc6 Delete the confusing "skipping" in the error message.
V11: https://lkml.org/lkml/2016/9/6/354 Rebase to latest Linux 4.8-rc5 Delete typedef (suggested by checkpatch.pl)
V10: https://lkml.org/lkml/2016/7/26/215 Drop the "readq" patch. Rebase to latest Linux 4.7.
V9: https://lkml.org/lkml/2016/7/25/345 Improve pr_err message in acpi gtdt driver. Update Commit message for 7/9 shorten the irq mapping function name Improve GTDT driver for memory-mapped timer
v8: https://lkml.org/lkml/2016/7/19/660 Improve "pr_fmt(fmt)" definition: add "ACPI" in front of "GTDT", and also improve printk message. Simplify is_timer_block and is_watchdog. Merge acpi_gtdt_desc_init and gtdt_arch_timer_init into acpi_gtdt_init(); Delete __init in include/linux/acpi.h for GTDT API Make ARM64 select GTDT. Delete "#include <linux/module.h>" from acpi_gtdt.c Simplify GT block parse code.
v7: https://lkml.org/lkml/2016/7/13/769 Move the GTDT driver to drivers/acpi/arm64 Add add the ARM64-specific ACPI Support maintainers in MAINTAINERS Merge 3 patches of GTDT parser driver. Fix the for_each_platform_timer bug.
v6: https://lkml.org/lkml/2016/6/29/580 split the GTDT driver to 4 parts: basic, arch_timer, memory-mapped timer, and SBSA Generic Watchdog timer Improve driver by suggestions and example code from Daniel Lezcano
v5: https://lkml.org/lkml/2016/5/24/356 Sorting out all patches, simplify the API of GTDT driver: GTDT driver just fills the data struct for arm_arch_timer driver.
v4: https://lists.linaro.org/pipermail/linaro-acpi/2016-March/006667.html Delete the kvm relevant patches Separate two patches for sorting out the code for arm_arch_timer. Improve irq info export code to allow missing irq info in GTDT table.
v3: https://lkml.org/lkml/2016/2/1/658 Improve GTDT driver code: (1)improve pr_* by defining pr_fmt(fmt) (2)simplify gtdt_sbsa_gwdt_init (3)improve gtdt_arch_timer_data_init, if table is NULL, it will try to get GTDT table. Move enum ppi_nr to arm_arch_timer.h, and add enum spi_nr. Add arm_arch_timer get ppi from DT and GTDT support for kvm.
v2: https://lkml.org/lkml/2015/12/2/10 Rebase to latest kernel version(4.4-rc3). Fix the bug about the config problem, use CONFIG_ACPI_GTDT instead of CONFIG_ACPI in arm_arch_timer.c
v1: The first upstreaming version: https://lkml.org/lkml/2015/10/28/553 Fu Wei (15): clocksource/drivers/arm_arch_timer: Move enums and defines to header file clocksource/drivers/arm_arch_timer: Add a new enum for spi type clocksource/drivers/arm_arch_timer: Improve printk relevant code clocksource/drivers/arm_arch_timer: rename some enums and defines. clocksource/drivers/arm_arch_timer: rework PPI determination clocksource/drivers/arm_arch_timer: Rework counter frequency detection. clocksource/drivers/arm_arch_timer: Refactor arch_timer_needs_probing clocksource/drivers/arm_arch_timer: move arch_timer_needs_of_probing into DT init call clocksource/drivers/arm_arch_timer: Introduce some new structs to prepare for GTDT clocksource/drivers/arm_arch_timer: Refactor the timer init code to prepare for GTDT acpi/arm64: Add GTDT table parse driver clocksource/drivers/arm_arch_timer: Simplify ACPI support code. acpi/arm64: Add memory-mapped timer support in GTDT driver clocksource/drivers/arm_arch_timer: Add GTDT support for memory-mapped timer acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver
arch/arm64/Kconfig | 1 + drivers/acpi/arm64/Kconfig | 3 + drivers/acpi/arm64/Makefile | 1 + drivers/acpi/arm64/gtdt.c | 374 +++++++++++++++++++++++++++ drivers/clocksource/arm_arch_timer.c | 478 ++++++++++++++++++++--------------- drivers/watchdog/Kconfig | 1 + include/clocksource/arm_arch_timer.h | 45 +++- include/linux/acpi.h | 7 + virt/kvm/arm/hyp/timer-sr.c | 6 +- 9 files changed, 708 insertions(+), 208 deletions(-) create mode 100644 drivers/acpi/arm64/gtdt.c
From: Fu Wei fu.wei@linaro.org
To support the arm_arch_timer via ACPI we need to share defines and enums between the driver and the ACPI parser code.
Split out the relevant defines and enums into arm_arch_timer.h, and change "enum ppi_nr" to "enum arch_timer_ppi_nr" to avoid the potential name clashes. Also switch "enum ppi_nr" to "enum arch_timer_ppi_nr" in arm_arch_timer.c. No functional change.
Signed-off-by: Fu Wei fu.wei@linaro.org Acked-by: Mark Rutland mark.rutland@arm.com Tested-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- drivers/clocksource/arm_arch_timer.c | 13 +------------ include/clocksource/arm_arch_timer.h | 12 ++++++++++++ 2 files changed, 13 insertions(+), 12 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 73c487d..21068be 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -51,8 +51,6 @@ #define CNTV_TVAL 0x38 #define CNTV_CTL 0x3c
-#define ARCH_CP15_TIMER BIT(0) -#define ARCH_MEM_TIMER BIT(1) static unsigned arch_timers_present __initdata;
static void __iomem *arch_counter_base; @@ -65,20 +63,11 @@ struct arch_timer { #define to_arch_timer(e) container_of(e, struct arch_timer, evt)
static u32 arch_timer_rate; - -enum ppi_nr { - PHYS_SECURE_PPI, - PHYS_NONSECURE_PPI, - VIRT_PPI, - HYP_PPI, - MAX_TIMER_PPI -}; - static int arch_timer_ppi[MAX_TIMER_PPI];
static struct clock_event_device __percpu *arch_timer_evt;
-static enum ppi_nr arch_timer_uses_ppi = VIRT_PPI; +static enum arch_timer_ppi_nr arch_timer_uses_ppi = VIRT_PPI; static bool arch_timer_c3stop; static bool arch_timer_mem_use_virtual;
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index caedb74..557f869 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -16,9 +16,13 @@ #ifndef __CLKSOURCE_ARM_ARCH_TIMER_H #define __CLKSOURCE_ARM_ARCH_TIMER_H
+#include <linux/bitops.h> #include <linux/timecounter.h> #include <linux/types.h>
+#define ARCH_CP15_TIMER BIT(0) +#define ARCH_MEM_TIMER BIT(1) + #define ARCH_TIMER_CTRL_ENABLE (1 << 0) #define ARCH_TIMER_CTRL_IT_MASK (1 << 1) #define ARCH_TIMER_CTRL_IT_STAT (1 << 2) @@ -34,6 +38,14 @@ enum arch_timer_reg { ARCH_TIMER_REG_TVAL, };
+enum arch_timer_ppi_nr { + PHYS_SECURE_PPI, + PHYS_NONSECURE_PPI, + VIRT_PPI, + HYP_PPI, + MAX_TIMER_PPI +}; + #define ARCH_TIMER_PHYS_ACCESS 0 #define ARCH_TIMER_VIRT_ACCESS 1 #define ARCH_TIMER_MEM_PHYS_ACCESS 2
From: Fu Wei fu.wei@linaro.org
This patch add a new enum "arch_timer_spi_nr" and use it in the driver. Just for code's readability, no functional change.
Signed-off-by: Fu Wei fu.wei@linaro.org Acked-by: Mark Rutland mark.rutland@arm.com --- drivers/clocksource/arm_arch_timer.c | 4 ++-- include/clocksource/arm_arch_timer.h | 6 ++++++ 2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 21068be..63bb532 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -960,9 +960,9 @@ static int __init arch_timer_mem_init(struct device_node *np) }
if (arch_timer_mem_use_virtual) - irq = irq_of_parse_and_map(best_frame, 1); + irq = irq_of_parse_and_map(best_frame, ARCH_TIMER_VIRT_SPI); else - irq = irq_of_parse_and_map(best_frame, 0); + irq = irq_of_parse_and_map(best_frame, ARCH_TIMER_PHYS_SPI);
ret = -EINVAL; if (!irq) { diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 557f869..d23c381 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -46,6 +46,12 @@ enum arch_timer_ppi_nr { MAX_TIMER_PPI };
+enum arch_timer_spi_nr { + ARCH_TIMER_PHYS_SPI, + ARCH_TIMER_VIRT_SPI, + ARCH_TIMER_MAX_TIMER_SPI +}; + #define ARCH_TIMER_PHYS_ACCESS 0 #define ARCH_TIMER_VIRT_ACCESS 1 #define ARCH_TIMER_MEM_PHYS_ACCESS 2
From: Fu Wei fu.wei@linaro.org
This patch defines pr_fmt(fmt) for all pr_* functions, then the pr_* doesn't need to add "arch_timer:" everytime.
According to the suggestion from checkpatch.pl: (1) delete some Blank Spaces in arch_timer_banner; (2) delete a redundant Tab in a bland line of arch_timer_init(void)
No functional change.
Signed-off-by: Fu Wei fu.wei@linaro.org Acked-by: Mark Rutland mark.rutland@arm.com Tested-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- drivers/clocksource/arm_arch_timer.c | 49 ++++++++++++++++++------------------ 1 file changed, 25 insertions(+), 24 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 63bb532..15341cf 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -32,6 +32,9 @@
#include <clocksource/arm_arch_timer.h>
+#undef pr_fmt +#define pr_fmt(fmt) "arch_timer: " fmt + #define CNTTIDR 0x08 #define CNTTIDR_VIRT(n) (BIT(1) << ((n) * 4))
@@ -504,22 +507,22 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
/* Check the timer frequency. */ if (arch_timer_rate == 0) - pr_warn("Architected timer frequency not available\n"); + pr_warn("frequency not available\n"); }
static void arch_timer_banner(unsigned type) { - pr_info("Architected %s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n", - type & ARCH_CP15_TIMER ? "cp15" : "", - type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? " and " : "", - type & ARCH_MEM_TIMER ? "mmio" : "", - (unsigned long)arch_timer_rate / 1000000, - (unsigned long)(arch_timer_rate / 10000) % 100, - type & ARCH_CP15_TIMER ? - (arch_timer_uses_ppi == VIRT_PPI) ? "virt" : "phys" : + pr_info("%s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n", + type & ARCH_CP15_TIMER ? "cp15" : "", + type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? " and " : "", + type & ARCH_MEM_TIMER ? "mmio" : "", + (unsigned long)arch_timer_rate / 1000000, + (unsigned long)(arch_timer_rate / 10000) % 100, + type & ARCH_CP15_TIMER ? + (arch_timer_uses_ppi == VIRT_PPI) ? "virt" : "phys" : "", - type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? "/" : "", - type & ARCH_MEM_TIMER ? + type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? "/" : "", + type & ARCH_MEM_TIMER ? arch_timer_mem_use_virtual ? "virt" : "phys" : ""); } @@ -618,8 +621,7 @@ static void __init arch_counter_register(unsigned type)
static void arch_timer_stop(struct clock_event_device *clk) { - pr_debug("arch_timer_teardown disable IRQ%d cpu #%d\n", - clk->irq, smp_processor_id()); + pr_debug("disable IRQ%d cpu #%d\n", clk->irq, smp_processor_id());
disable_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi]); if (arch_timer_has_nonsecure_ppi()) @@ -712,8 +714,7 @@ static int __init arch_timer_register(void) }
if (err) { - pr_err("arch_timer: can't register interrupt %d (%d)\n", - ppi, err); + pr_err("can't register interrupt %d (%d)\n", ppi, err); goto out_free; }
@@ -766,7 +767,7 @@ static int __init arch_timer_mem_register(void __iomem *base, unsigned int irq)
ret = request_irq(irq, func, IRQF_TIMER, "arch_mem_timer", &t->evt); if (ret) { - pr_err("arch_timer: Failed to request mem timer irq\n"); + pr_err("Failed to request mem timer irq\n"); kfree(t); }
@@ -844,7 +845,7 @@ static int __init arch_timer_init(void) }
if (!has_ppi) { - pr_warn("arch_timer: No interrupt available, giving up\n"); + pr_warn("No interrupt available, giving up\n"); return -EINVAL; } } @@ -858,7 +859,7 @@ static int __init arch_timer_init(void) return ret;
arch_timer_kvm_info.virtual_irq = arch_timer_ppi[VIRT_PPI]; - + return 0; }
@@ -867,7 +868,7 @@ static int __init arch_timer_of_init(struct device_node *np) int i;
if (arch_timers_present & ARCH_CP15_TIMER) { - pr_warn("arch_timer: multiple nodes in dt, skipping\n"); + pr_warn("multiple nodes in dt, skipping\n"); return 0; }
@@ -911,7 +912,7 @@ static int __init arch_timer_mem_init(struct device_node *np) arch_timers_present |= ARCH_MEM_TIMER; cntctlbase = of_iomap(np, 0); if (!cntctlbase) { - pr_err("arch_timer: Can't find CNTCTLBase\n"); + pr_err("Can't find CNTCTLBase\n"); return -ENXIO; }
@@ -926,7 +927,7 @@ static int __init arch_timer_mem_init(struct device_node *np) u32 cntacr;
if (of_property_read_u32(frame, "frame-number", &n)) { - pr_err("arch_timer: Missing frame-number\n"); + pr_err("Missing frame-number\n"); of_node_put(frame); goto out; } @@ -955,7 +956,7 @@ static int __init arch_timer_mem_init(struct device_node *np) ret= -ENXIO; base = arch_counter_base = of_iomap(best_frame, 0); if (!base) { - pr_err("arch_timer: Can't map frame's registers\n"); + pr_err("Can't map frame's registers\n"); goto out; }
@@ -966,7 +967,7 @@ static int __init arch_timer_mem_init(struct device_node *np)
ret = -EINVAL; if (!irq) { - pr_err("arch_timer: Frame missing %s irq", + pr_err("Frame missing %s irq", arch_timer_mem_use_virtual ? "virt" : "phys"); goto out; } @@ -1008,7 +1009,7 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) struct acpi_table_gtdt *gtdt;
if (arch_timers_present & ARCH_CP15_TIMER) { - pr_warn("arch_timer: already initialized, skipping\n"); + pr_warn("already initialized, skipping\n"); return -EINVAL; }
From: Fu Wei fu.wei@linaro.org
Rename some enums and defines, to unify the format of enums and defines in arm_arch_timer.h, also update all the users of these enums and defines: drivers/clocksource/arm_arch_timer.c virt/kvm/arm/hyp/timer-sr.c
No functional change.
Signed-off-by: Fu Wei fu.wei@linaro.org Tested-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- drivers/clocksource/arm_arch_timer.c | 111 ++++++++++++++++++----------------- include/clocksource/arm_arch_timer.h | 24 ++++---- virt/kvm/arm/hyp/timer-sr.c | 6 +- 3 files changed, 73 insertions(+), 68 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 15341cf..231175b 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -66,11 +66,11 @@ struct arch_timer { #define to_arch_timer(e) container_of(e, struct arch_timer, evt)
static u32 arch_timer_rate; -static int arch_timer_ppi[MAX_TIMER_PPI]; +static int arch_timer_ppi[ARCH_TIMER_MAX_TIMER_PPI];
static struct clock_event_device __percpu *arch_timer_evt;
-static enum arch_timer_ppi_nr arch_timer_uses_ppi = VIRT_PPI; +static enum arch_timer_ppi_nr arch_timer_uses_ppi = ARCH_TIMER_VIRT_PPI; static bool arch_timer_c3stop; static bool arch_timer_mem_use_virtual;
@@ -340,7 +340,7 @@ static void fsl_a008585_set_sne(struct clock_event_device *clk) if (!static_branch_unlikely(&arch_timer_read_ool_enabled)) return;
- if (arch_timer_uses_ppi == VIRT_PPI) + if (arch_timer_uses_ppi == ARCH_TIMER_VIRT_PPI) clk->set_next_event = fsl_a008585_set_next_event_virt; else clk->set_next_event = fsl_a008585_set_next_event_phys; @@ -352,7 +352,7 @@ static void __arch_timer_setup(unsigned type, { clk->features = CLOCK_EVT_FEAT_ONESHOT;
- if (type == ARCH_CP15_TIMER) { + if (type == ARCH_TIMER_TYPE_CP15) { if (arch_timer_c3stop) clk->features |= CLOCK_EVT_FEAT_C3STOP; clk->name = "arch_sys_timer"; @@ -360,14 +360,14 @@ static void __arch_timer_setup(unsigned type, clk->cpumask = cpumask_of(smp_processor_id()); clk->irq = arch_timer_ppi[arch_timer_uses_ppi]; switch (arch_timer_uses_ppi) { - case VIRT_PPI: + case ARCH_TIMER_VIRT_PPI: clk->set_state_shutdown = arch_timer_shutdown_virt; clk->set_state_oneshot_stopped = arch_timer_shutdown_virt; clk->set_next_event = arch_timer_set_next_event_virt; break; - case PHYS_SECURE_PPI: - case PHYS_NONSECURE_PPI: - case HYP_PPI: + case ARCH_TIMER_PHYS_SECURE_PPI: + case ARCH_TIMER_PHYS_NONSECURE_PPI: + case ARCH_TIMER_HYP_PPI: clk->set_state_shutdown = arch_timer_shutdown_phys; clk->set_state_oneshot_stopped = arch_timer_shutdown_phys; clk->set_next_event = arch_timer_set_next_event_phys; @@ -447,8 +447,8 @@ static void arch_counter_set_user_access(void)
static bool arch_timer_has_nonsecure_ppi(void) { - return (arch_timer_uses_ppi == PHYS_SECURE_PPI && - arch_timer_ppi[PHYS_NONSECURE_PPI]); + return (arch_timer_uses_ppi == ARCH_TIMER_PHYS_SECURE_PPI && + arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]); }
static u32 check_ppi_trigger(int irq) @@ -469,14 +469,15 @@ static int arch_timer_starting_cpu(unsigned int cpu) struct clock_event_device *clk = this_cpu_ptr(arch_timer_evt); u32 flags;
- __arch_timer_setup(ARCH_CP15_TIMER, clk); + __arch_timer_setup(ARCH_TIMER_TYPE_CP15, clk);
flags = check_ppi_trigger(arch_timer_ppi[arch_timer_uses_ppi]); enable_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi], flags);
if (arch_timer_has_nonsecure_ppi()) { - flags = check_ppi_trigger(arch_timer_ppi[PHYS_NONSECURE_PPI]); - enable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], flags); + flags = check_ppi_trigger(arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]); + enable_percpu_irq(arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI], + flags); }
arch_counter_set_user_access(); @@ -513,16 +514,17 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) static void arch_timer_banner(unsigned type) { pr_info("%s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n", - type & ARCH_CP15_TIMER ? "cp15" : "", - type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? " and " : "", - type & ARCH_MEM_TIMER ? "mmio" : "", + type & ARCH_TIMER_TYPE_CP15 ? "cp15" : "", + type == (ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM) ? + " and " : "", + type & ARCH_TIMER_TYPE_MEM ? "mmio" : "", (unsigned long)arch_timer_rate / 1000000, (unsigned long)(arch_timer_rate / 10000) % 100, - type & ARCH_CP15_TIMER ? - (arch_timer_uses_ppi == VIRT_PPI) ? "virt" : "phys" : + type & ARCH_TIMER_TYPE_CP15 ? + (arch_timer_uses_ppi == ARCH_TIMER_VIRT_PPI) ? "virt" : "phys" : "", - type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? "/" : "", - type & ARCH_MEM_TIMER ? + type == (ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM) ? "/" : "", + type & ARCH_TIMER_TYPE_MEM ? arch_timer_mem_use_virtual ? "virt" : "phys" : ""); } @@ -588,8 +590,9 @@ static void __init arch_counter_register(unsigned type) u64 start_count;
/* Register the CP15 based counter if we have one */ - if (type & ARCH_CP15_TIMER) { - if (IS_ENABLED(CONFIG_ARM64) || arch_timer_uses_ppi == VIRT_PPI) + if (type & ARCH_TIMER_TYPE_CP15) { + if (IS_ENABLED(CONFIG_ARM64) || + arch_timer_uses_ppi == ARCH_TIMER_VIRT_PPI) arch_timer_read_counter = arch_counter_get_cntvct; else arch_timer_read_counter = arch_counter_get_cntpct; @@ -625,7 +628,7 @@ static void arch_timer_stop(struct clock_event_device *clk)
disable_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi]); if (arch_timer_has_nonsecure_ppi()) - disable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI]); + disable_percpu_irq(arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]);
clk->set_state_shutdown(clk); } @@ -688,24 +691,24 @@ static int __init arch_timer_register(void)
ppi = arch_timer_ppi[arch_timer_uses_ppi]; switch (arch_timer_uses_ppi) { - case VIRT_PPI: + case ARCH_TIMER_VIRT_PPI: err = request_percpu_irq(ppi, arch_timer_handler_virt, "arch_timer", arch_timer_evt); break; - case PHYS_SECURE_PPI: - case PHYS_NONSECURE_PPI: + case ARCH_TIMER_PHYS_SECURE_PPI: + case ARCH_TIMER_PHYS_NONSECURE_PPI: err = request_percpu_irq(ppi, arch_timer_handler_phys, "arch_timer", arch_timer_evt); - if (!err && arch_timer_ppi[PHYS_NONSECURE_PPI]) { - ppi = arch_timer_ppi[PHYS_NONSECURE_PPI]; + if (!err && arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]) { + ppi = arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]; err = request_percpu_irq(ppi, arch_timer_handler_phys, "arch_timer", arch_timer_evt); if (err) - free_percpu_irq(arch_timer_ppi[PHYS_SECURE_PPI], + free_percpu_irq(arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI], arch_timer_evt); } break; - case HYP_PPI: + case ARCH_TIMER_HYP_PPI: err = request_percpu_irq(ppi, arch_timer_handler_phys, "arch_timer", arch_timer_evt); break; @@ -737,7 +740,7 @@ static int __init arch_timer_register(void) out_unreg_notify: free_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi], arch_timer_evt); if (arch_timer_has_nonsecure_ppi()) - free_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], + free_percpu_irq(arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI], arch_timer_evt);
out_free: @@ -758,7 +761,7 @@ static int __init arch_timer_mem_register(void __iomem *base, unsigned int irq)
t->base = base; t->evt.irq = irq; - __arch_timer_setup(ARCH_MEM_TIMER, &t->evt); + __arch_timer_setup(ARCH_TIMER_TYPE_MEM, &t->evt);
if (arch_timer_mem_use_virtual) func = arch_timer_handler_virt_mem; @@ -801,13 +804,15 @@ arch_timer_needs_probing(int type, const struct of_device_id *matches)
static int __init arch_timer_common_init(void) { - unsigned mask = ARCH_CP15_TIMER | ARCH_MEM_TIMER; + unsigned mask = ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM;
/* Wait until both nodes are probed if we have two timers */ if ((arch_timers_present & mask) != mask) { - if (arch_timer_needs_probing(ARCH_MEM_TIMER, arch_timer_mem_of_match)) + if (arch_timer_needs_probing(ARCH_TIMER_TYPE_MEM, + arch_timer_mem_of_match)) return 0; - if (arch_timer_needs_probing(ARCH_CP15_TIMER, arch_timer_of_match)) + if (arch_timer_needs_probing(ARCH_TIMER_TYPE_CP15, + arch_timer_of_match)) return 0; }
@@ -832,16 +837,16 @@ static int __init arch_timer_init(void) * their CNTHP_*_EL2 counterparts, and use a different PPI * number. */ - if (is_hyp_mode_available() || !arch_timer_ppi[VIRT_PPI]) { + if (is_hyp_mode_available() || !arch_timer_ppi[ARCH_TIMER_VIRT_PPI]) { bool has_ppi;
if (is_kernel_in_hyp_mode()) { - arch_timer_uses_ppi = HYP_PPI; - has_ppi = !!arch_timer_ppi[HYP_PPI]; + arch_timer_uses_ppi = ARCH_TIMER_HYP_PPI; + has_ppi = !!arch_timer_ppi[ARCH_TIMER_HYP_PPI]; } else { - arch_timer_uses_ppi = PHYS_SECURE_PPI; - has_ppi = (!!arch_timer_ppi[PHYS_SECURE_PPI] || - !!arch_timer_ppi[PHYS_NONSECURE_PPI]); + arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI; + has_ppi = (!!arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] || + !!arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]); }
if (!has_ppi) { @@ -858,7 +863,7 @@ static int __init arch_timer_init(void) if (ret) return ret;
- arch_timer_kvm_info.virtual_irq = arch_timer_ppi[VIRT_PPI]; + arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
return 0; } @@ -867,13 +872,13 @@ static int __init arch_timer_of_init(struct device_node *np) { int i;
- if (arch_timers_present & ARCH_CP15_TIMER) { + if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("multiple nodes in dt, skipping\n"); return 0; }
- arch_timers_present |= ARCH_CP15_TIMER; - for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) + arch_timers_present |= ARCH_TIMER_TYPE_CP15; + for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++) arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
arch_timer_detect_rate(NULL, np); @@ -895,7 +900,7 @@ static int __init arch_timer_of_init(struct device_node *np) */ if (IS_ENABLED(CONFIG_ARM) && of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) - arch_timer_uses_ppi = PHYS_SECURE_PPI; + arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI;
return arch_timer_init(); } @@ -909,7 +914,7 @@ static int __init arch_timer_mem_init(struct device_node *np) unsigned int irq, ret = -EINVAL; u32 cnttidr;
- arch_timers_present |= ARCH_MEM_TIMER; + arch_timers_present |= ARCH_TIMER_TYPE_MEM; cntctlbase = of_iomap(np, 0); if (!cntctlbase) { pr_err("Can't find CNTCTLBase\n"); @@ -1008,28 +1013,28 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) { struct acpi_table_gtdt *gtdt;
- if (arch_timers_present & ARCH_CP15_TIMER) { + if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("already initialized, skipping\n"); return -EINVAL; }
gtdt = container_of(table, struct acpi_table_gtdt, header);
- arch_timers_present |= ARCH_CP15_TIMER; + arch_timers_present |= ARCH_TIMER_TYPE_CP15;
- arch_timer_ppi[PHYS_SECURE_PPI] = + arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] = map_generic_timer_interrupt(gtdt->secure_el1_interrupt, gtdt->secure_el1_flags);
- arch_timer_ppi[PHYS_NONSECURE_PPI] = + arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI] = map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, gtdt->non_secure_el1_flags);
- arch_timer_ppi[VIRT_PPI] = + arch_timer_ppi[ARCH_TIMER_VIRT_PPI] = map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, gtdt->virtual_timer_flags);
- arch_timer_ppi[HYP_PPI] = + arch_timer_ppi[ARCH_TIMER_HYP_PPI] = map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, gtdt->non_secure_el2_flags);
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index d23c381..48376a5 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -20,18 +20,18 @@ #include <linux/timecounter.h> #include <linux/types.h>
-#define ARCH_CP15_TIMER BIT(0) -#define ARCH_MEM_TIMER BIT(1) +#define ARCH_TIMER_TYPE_CP15 BIT(0) +#define ARCH_TIMER_TYPE_MEM BIT(1)
#define ARCH_TIMER_CTRL_ENABLE (1 << 0) #define ARCH_TIMER_CTRL_IT_MASK (1 << 1) #define ARCH_TIMER_CTRL_IT_STAT (1 << 2)
-#define CNTHCTL_EL1PCTEN (1 << 0) -#define CNTHCTL_EL1PCEN (1 << 1) -#define CNTHCTL_EVNTEN (1 << 2) -#define CNTHCTL_EVNTDIR (1 << 3) -#define CNTHCTL_EVNTI (0xF << 4) +#define ARCH_TIMER_CNTHCTL_EL1PCTEN (1 << 0) +#define ARCH_TIMER_CNTHCTL_EL1PCEN (1 << 1) +#define ARCH_TIMER_CNTHCTL_EVNTEN (1 << 2) +#define ARCH_TIMER_CNTHCTL_EVNTDIR (1 << 3) +#define ARCH_TIMER_CNTHCTL_EVNTI (0xF << 4)
enum arch_timer_reg { ARCH_TIMER_REG_CTRL, @@ -39,11 +39,11 @@ enum arch_timer_reg { };
enum arch_timer_ppi_nr { - PHYS_SECURE_PPI, - PHYS_NONSECURE_PPI, - VIRT_PPI, - HYP_PPI, - MAX_TIMER_PPI + ARCH_TIMER_PHYS_SECURE_PPI, + ARCH_TIMER_PHYS_NONSECURE_PPI, + ARCH_TIMER_VIRT_PPI, + ARCH_TIMER_HYP_PPI, + ARCH_TIMER_MAX_TIMER_PPI };
enum arch_timer_spi_nr { diff --git a/virt/kvm/arm/hyp/timer-sr.c b/virt/kvm/arm/hyp/timer-sr.c index 798866a..695b9d9 100644 --- a/virt/kvm/arm/hyp/timer-sr.c +++ b/virt/kvm/arm/hyp/timer-sr.c @@ -37,7 +37,7 @@ void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
/* Allow physical timer/counter access for the host */ val = read_sysreg(cnthctl_el2); - val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN; + val |= ARCH_TIMER_CNTHCTL_EL1PCTEN | ARCH_TIMER_CNTHCTL_EL1PCEN; write_sysreg(val, cnthctl_el2);
/* Clear cntvoff for the host */ @@ -55,8 +55,8 @@ void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu) * Physical counter access is allowed */ val = read_sysreg(cnthctl_el2); - val &= ~CNTHCTL_EL1PCEN; - val |= CNTHCTL_EL1PCTEN; + val &= ~ARCH_TIMER_CNTHCTL_EL1PCEN; + val |= ARCH_TIMER_CNTHCTL_EL1PCTEN; write_sysreg(val, cnthctl_el2);
if (timer->enabled) {
From: Fu Wei fu.wei@linaro.org
Currently, the arch timer driver uses ARCH_TIMER_PHYS_SECURE_PPI to mean the driver will use the secure PPI *and* potentialy also use the non-secure PPI. This is somewhat confusing.
For arm64, where it never makes sense to use the secure PPI, this means we must always request the useless secure PPI, adding to the confusion. For ACPI, where we may not even have a valid secure PPI number, this is additionally problematic. We need the driver to be able to use *only* the non-secure PPI.
The logic to choose which PPI to use is intertwined with other logic in arch_timer_init(). This patch factors the PPI determination out into a new function named arch_timer_select_ppi, and then reworks it so that we can handle having only a non-secure PPI.
This patch also moves arch_timer_ppi verification out to caller, because we can verify the configuration from device-tree for ARM by this way.
Meanwhile, because we will select ARCH_TIMER_PHYS_NONSECURE_PPI for ARM64, the logic in arch_timer_register also need to be updated.
Signed-off-by: Fu Wei fu.wei@linaro.org --- drivers/clocksource/arm_arch_timer.c | 77 +++++++++++++++++++++--------------- 1 file changed, 46 insertions(+), 31 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 231175b..e43be0a 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -699,7 +699,7 @@ static int __init arch_timer_register(void) case ARCH_TIMER_PHYS_NONSECURE_PPI: err = request_percpu_irq(ppi, arch_timer_handler_phys, "arch_timer", arch_timer_evt); - if (!err && arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]) { + if (!err && arch_timer_has_nonsecure_ppi()) { ppi = arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]; err = request_percpu_irq(ppi, arch_timer_handler_phys, "arch_timer", arch_timer_evt); @@ -821,39 +821,41 @@ static int __init arch_timer_common_init(void) return arch_timer_arch_init(); }
-static int __init arch_timer_init(void) +/** + * arch_timer_select_ppi() - Select suitable PPI for the current system. + * + * If HYP mode is available, we know that the physical timer + * has been configured to be accessible from PL1. Use it, so + * that a guest can use the virtual timer instead. + * + * On ARMv8.1 with VH extensions, the kernel runs in HYP. VHE + * accesses to CNTP_*_EL1 registers are silently redirected to + * their CNTHP_*_EL2 counterparts, and use a different PPI + * number. + * + * If no interrupt provided for virtual timer, we'll have to + * stick to the physical timer. It'd better be accessible... + * For arm64 we never use the secure interrupt. + * + * Return: a suitable PPI type for the current system. + */ +static enum arch_timer_ppi_nr __init arch_timer_select_ppi(void) { - int ret; - /* - * If HYP mode is available, we know that the physical timer - * has been configured to be accessible from PL1. Use it, so - * that a guest can use the virtual timer instead. - * - * If no interrupt provided for virtual timer, we'll have to - * stick to the physical timer. It'd better be accessible... - * - * On ARMv8.1 with VH extensions, the kernel runs in HYP. VHE - * accesses to CNTP_*_EL1 registers are silently redirected to - * their CNTHP_*_EL2 counterparts, and use a different PPI - * number. - */ - if (is_hyp_mode_available() || !arch_timer_ppi[ARCH_TIMER_VIRT_PPI]) { - bool has_ppi; + if (is_hyp_mode_available() && is_kernel_in_hyp_mode()) + return ARCH_TIMER_HYP_PPI;
- if (is_kernel_in_hyp_mode()) { - arch_timer_uses_ppi = ARCH_TIMER_HYP_PPI; - has_ppi = !!arch_timer_ppi[ARCH_TIMER_HYP_PPI]; - } else { - arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI; - has_ppi = (!!arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] || - !!arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]); - } + if (arch_timer_ppi[ARCH_TIMER_VIRT_PPI]) + return ARCH_TIMER_VIRT_PPI;
- if (!has_ppi) { - pr_warn("No interrupt available, giving up\n"); - return -EINVAL; - } - } + if (IS_ENABLED(CONFIG_ARM64)) + return ARCH_TIMER_PHYS_NONSECURE_PPI; + + return ARCH_TIMER_PHYS_SECURE_PPI; +} + +static int __init arch_timer_init(void) +{ + int ret;
ret = arch_timer_register(); if (ret) @@ -901,6 +903,13 @@ static int __init arch_timer_of_init(struct device_node *np) if (IS_ENABLED(CONFIG_ARM) && of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI; + else + arch_timer_uses_ppi = arch_timer_select_ppi(); + + if (!arch_timer_ppi[arch_timer_uses_ppi]) { + pr_err("No interrupt available, giving up\n"); + return -EINVAL; + }
return arch_timer_init(); } @@ -1041,6 +1050,12 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) /* Get the frequency from CNTFRQ */ arch_timer_detect_rate(NULL, NULL);
+ arch_timer_uses_ppi = arch_timer_select_ppi(); + if (!arch_timer_ppi[arch_timer_uses_ppi]) { + pr_err("No interrupt available, giving up\n"); + return -EINVAL; + } + /* Always-on capability */ arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON);
From: Fu Wei fu.wei@linaro.org
Currently, the counter frequency detection call(arch_timer_detect_rate) combines all the ways to get counter frequency: device-tree property, system coprocessor register, MMIO timer. But in the most of use cases, we don't need all the ways to try: For example, reading device-tree property will be needed only when system boot with device-tree, getting frequency from MMIO timer register will beneeded only when we init MMIO timer.
This patch separates paths to determine frequency: Separate out device-tree code, keep them in device-tree init function. Separate out the MMIO frequency and the sysreg frequency detection call, and use the appropriate one for the counter.
Signed-off-by: Fu Wei fu.wei@linaro.org --- drivers/clocksource/arm_arch_timer.c | 49 +++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 18 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index e43be0a..e554081 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -487,27 +487,31 @@ static int arch_timer_starting_cpu(unsigned int cpu) return 0; }
-static void -arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) +static void arch_timer_detect_rate(void) { - /* Who has more than one independent system counter? */ - if (arch_timer_rate) - return; + /* + * Try to get the timer frequency from + * cntfrq_el0(system coprocessor register). + */ + if (!arch_timer_rate) + arch_timer_rate = arch_timer_get_cntfrq(); + + /* Check the timer frequency. */ + if (!arch_timer_rate) + pr_warn("frequency not available\n"); +}
+static void arch_timer_mem_detect_rate(void __iomem *cntbase) +{ /* - * Try to determine the frequency from the device tree or CNTFRQ, - * if ACPI is enabled, get the frequency from CNTFRQ ONLY. + * Try to determine the frequency from + * CNTFRQ in memory-mapped timer. */ - if (!acpi_disabled || - of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { - if (cntbase) - arch_timer_rate = readl_relaxed(cntbase + CNTFRQ); - else - arch_timer_rate = arch_timer_get_cntfrq(); - } + if (!arch_timer_rate) + arch_timer_rate = readl_relaxed(cntbase + CNTFRQ);
/* Check the timer frequency. */ - if (arch_timer_rate == 0) + if (!arch_timer_rate) pr_warn("frequency not available\n"); }
@@ -883,7 +887,9 @@ static int __init arch_timer_of_init(struct device_node *np) for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++) arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
- arch_timer_detect_rate(NULL, np); + if (!arch_timer_rate && + of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) + arch_timer_detect_rate();
arch_timer_c3stop = !of_property_read_bool(np, "always-on");
@@ -986,7 +992,14 @@ static int __init arch_timer_mem_init(struct device_node *np) goto out; }
- arch_timer_detect_rate(base, np); + /* + * Try to determine the frequency from the device tree, + * if fail, get the frequency from CNTFRQ. + */ + if (!arch_timer_rate && + of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) + arch_timer_mem_detect_rate(base); + ret = arch_timer_mem_register(base, irq); if (ret) goto out; @@ -1048,7 +1061,7 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) gtdt->non_secure_el2_flags);
/* Get the frequency from CNTFRQ */ - arch_timer_detect_rate(NULL, NULL); + arch_timer_detect_rate();
arch_timer_uses_ppi = arch_timer_select_ppi(); if (!arch_timer_ppi[arch_timer_uses_ppi]) {
From: Fu Wei fu.wei@linaro.org
When system init with device-tree, we don't know which node will be initialized first. And the code in arch_timer_common_init should wait until per-cpu timer and MMIO timer are both initialized. So we need arch_timer_needs_probing to detect the init status of system.
But currently the code is dispersed in arch_timer_needs_probing and arch_timer_common_init. And the function name doesn't specify that it's only for device-tree. This is somewhat confusing.
This patch move all related code from arch_timer_common_init to arch_timer_needs_probing, refactor it, and rename it to arch_timer_needs_of_probing. And make sure that it will be called only if acpi is disabled.
Signed-off-by: Fu Wei fu.wei@linaro.org --- drivers/clocksource/arm_arch_timer.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index e554081..2c9085a 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -792,15 +792,28 @@ static const struct of_device_id arch_timer_mem_of_match[] __initconst = { {}, };
-static bool __init -arch_timer_needs_probing(int type, const struct of_device_id *matches) +static bool __init arch_timer_needs_of_probing(void) { struct device_node *dn; bool needs_probing = false; + unsigned int mask = ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM;
- dn = of_find_matching_node(NULL, matches); - if (dn && of_device_is_available(dn) && !(arch_timers_present & type)) + /* We have two timers, and both device-tree nodes are probed. */ + if ((arch_timers_present & mask) == mask) + return false; + + /* + * Only one type of timer is probed, + * check if we have another type of timer node in device-tree. + */ + if (arch_timers_present & ARCH_TIMER_TYPE_CP15) + dn = of_find_matching_node(NULL, arch_timer_mem_of_match); + else + dn = of_find_matching_node(NULL, arch_timer_of_match); + + if (dn && of_device_is_available(dn)) needs_probing = true; + of_node_put(dn);
return needs_probing; @@ -808,17 +821,8 @@ arch_timer_needs_probing(int type, const struct of_device_id *matches)
static int __init arch_timer_common_init(void) { - unsigned mask = ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM; - - /* Wait until both nodes are probed if we have two timers */ - if ((arch_timers_present & mask) != mask) { - if (arch_timer_needs_probing(ARCH_TIMER_TYPE_MEM, - arch_timer_mem_of_match)) - return 0; - if (arch_timer_needs_probing(ARCH_TIMER_TYPE_CP15, - arch_timer_of_match)) - return 0; - } + if (acpi_disabled && arch_timer_needs_of_probing()) + return 0;
arch_timer_banner(arch_timers_present); arch_counter_register(arch_timers_present);
From: Fu Wei fu.wei@linaro.org
Because arch_timer_needs_of_probing is only for booting with device-tree, but arch_timer_common_init is a generic init call which shouldn't include the FW-specific code. It's better to put arch_timer_needs_of_probing into DT init function.
But for per-cpu timer, the arch_timer_common_init is called from arch_timer_init. For reaching the goal above, this patch disassemble arch_timer_init and use arch_timer_register and arch_timer_common_init directly, just like arch_timer_mem init code is doing. By this way, all the DT relevant code are only called from DT init call.
Signed-off-by: Fu Wei fu.wei@linaro.org --- drivers/clocksource/arm_arch_timer.c | 45 ++++++++++++++++-------------------- 1 file changed, 20 insertions(+), 25 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 2c9085a..4549008 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -821,9 +821,6 @@ static bool __init arch_timer_needs_of_probing(void)
static int __init arch_timer_common_init(void) { - if (acpi_disabled && arch_timer_needs_of_probing()) - return 0; - arch_timer_banner(arch_timers_present); arch_counter_register(arch_timers_present); return arch_timer_arch_init(); @@ -861,26 +858,9 @@ static enum arch_timer_ppi_nr __init arch_timer_select_ppi(void) return ARCH_TIMER_PHYS_SECURE_PPI; }
-static int __init arch_timer_init(void) -{ - int ret; - - ret = arch_timer_register(); - if (ret) - return ret; - - ret = arch_timer_common_init(); - if (ret) - return ret; - - arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI]; - - return 0; -} - static int __init arch_timer_of_init(struct device_node *np) { - int i; + int i, ret;
if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("multiple nodes in dt, skipping\n"); @@ -891,6 +871,8 @@ static int __init arch_timer_of_init(struct device_node *np) for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++) arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
+ arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI]; + if (!arch_timer_rate && of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) arch_timer_detect_rate(); @@ -921,7 +903,14 @@ static int __init arch_timer_of_init(struct device_node *np) return -EINVAL; }
- return arch_timer_init(); + ret = arch_timer_register(); + if (ret) + return ret; + + if (arch_timer_needs_of_probing()) + return 0; + + return arch_timer_common_init(); } CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init); CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_of_init); @@ -1008,7 +997,8 @@ static int __init arch_timer_mem_init(struct device_node *np) if (ret) goto out;
- return arch_timer_common_init(); + if (!arch_timer_needs_of_probing()) + ret = arch_timer_common_init(); out: iounmap(cntctlbase); of_node_put(best_frame); @@ -1064,6 +1054,8 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, gtdt->non_secure_el2_flags);
+ arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI]; + /* Get the frequency from CNTFRQ */ arch_timer_detect_rate();
@@ -1076,8 +1068,11 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) /* Always-on capability */ arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON);
- arch_timer_init(); - return 0; + ret = arch_timer_register(); + if (ret) + return ret; + + return arch_timer_common_init(); } CLOCKSOURCE_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init); #endif
From: Fu Wei fu.wei@linaro.org
The patch introduce two new structs: arch_timer_mem, arch_timer_mem_frame. And also introduce a new define: ARCH_TIMER_MEM_MAX_FRAMES
These will be used for refactoring the memory-mapped timer init code to prepare for GTDT
Signed-off-by: Fu Wei fu.wei@linaro.org --- include/clocksource/arm_arch_timer.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 48376a5..3403247 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -57,6 +57,8 @@ enum arch_timer_spi_nr { #define ARCH_TIMER_MEM_PHYS_ACCESS 2 #define ARCH_TIMER_MEM_VIRT_ACCESS 3
+#define ARCH_TIMER_MEM_MAX_FRAMES 8 + #define ARCH_TIMER_USR_PCT_ACCESS_EN (1 << 0) /* physical counter */ #define ARCH_TIMER_USR_VCT_ACCESS_EN (1 << 1) /* virtual counter */ #define ARCH_TIMER_VIRT_EVT_EN (1 << 2) @@ -72,6 +74,21 @@ struct arch_timer_kvm_info { int virtual_irq; };
+struct arch_timer_mem_frame { + int frame_nr; + phys_addr_t cntbase; + size_t size; + int phys_irq; + int virt_irq; +}; + +struct arch_timer_mem { + phys_addr_t cntctlbase; + size_t size; + int num_frames; + struct arch_timer_mem_frame frame[ARCH_TIMER_MEM_MAX_FRAMES]; +}; + #ifdef CONFIG_ARM_ARCH_TIMER
extern u32 arch_timer_get_rate(void);
From: Fu Wei fu.wei@linaro.org
The patch refactor original memory-mapped timer init code: (1) Refactor "arch_timer_mem_init", make it become a common code for memory-mapped timer init. (2) Add a new function "arch_timer_mem_of_init" for DT init.
Signed-off-by: Fu Wei fu.wei@linaro.org --- drivers/clocksource/arm_arch_timer.c | 130 ++++++++++++++++++++++++----------- 1 file changed, 88 insertions(+), 42 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 4549008..bcdceca 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -915,17 +915,17 @@ static int __init arch_timer_of_init(struct device_node *np) CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init); CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_of_init);
-static int __init arch_timer_mem_init(struct device_node *np) +static int __init arch_timer_mem_init(struct arch_timer_mem *timer_mem) { - struct device_node *frame, *best_frame = NULL; void __iomem *cntctlbase, *base; - unsigned int irq, ret = -EINVAL; + struct arch_timer_mem_frame *best_frame = NULL; + unsigned int irq; u32 cnttidr; + int i, ret;
- arch_timers_present |= ARCH_TIMER_TYPE_MEM; - cntctlbase = of_iomap(np, 0); + cntctlbase = ioremap(timer_mem->cntctlbase, timer_mem->size); if (!cntctlbase) { - pr_err("Can't find CNTCTLBase\n"); + pr_err("Can't map CNTCTLBase.\n"); return -ENXIO; }
@@ -935,26 +935,18 @@ static int __init arch_timer_mem_init(struct device_node *np) * Try to find a virtual capable frame. Otherwise fall back to a * physical capable frame. */ - for_each_available_child_of_node(np, frame) { - int n; - u32 cntacr; - - if (of_property_read_u32(frame, "frame-number", &n)) { - pr_err("Missing frame-number\n"); - of_node_put(frame); - goto out; - } + for (i = 0; i < timer_mem->num_frames; i++) { + u32 cntacr = CNTACR_RFRQ | CNTACR_RWPT | CNTACR_RPCT | + CNTACR_RWVT | CNTACR_RVOFF | CNTACR_RVCT; + int n = timer_mem->frame[i].frame_nr;
/* Try enabling everything, and see what sticks */ - cntacr = CNTACR_RFRQ | CNTACR_RWPT | CNTACR_RPCT | - CNTACR_RWVT | CNTACR_RVOFF | CNTACR_RVCT; writel_relaxed(cntacr, cntctlbase + CNTACR(n)); cntacr = readl_relaxed(cntctlbase + CNTACR(n));
if ((cnttidr & CNTTIDR_VIRT(n)) && !(~cntacr & (CNTACR_RWVT | CNTACR_RVCT))) { - of_node_put(best_frame); - best_frame = frame; + best_frame = &timer_mem->frame[i]; arch_timer_mem_use_virtual = true; break; } @@ -962,50 +954,104 @@ static int __init arch_timer_mem_init(struct device_node *np) if (~cntacr & (CNTACR_RWPT | CNTACR_RPCT)) continue;
- of_node_put(best_frame); - best_frame = of_node_get(frame); + best_frame = &timer_mem->frame[i]; } + iounmap(cntctlbase);
- ret= -ENXIO; - base = arch_counter_base = of_iomap(best_frame, 0); - if (!base) { - pr_err("Can't map frame's registers\n"); - goto out; + if (!best_frame) { + pr_err("Can't find frame for register\n"); + return -EINVAL; }
if (arch_timer_mem_use_virtual) - irq = irq_of_parse_and_map(best_frame, ARCH_TIMER_VIRT_SPI); + irq = best_frame->virt_irq; else - irq = irq_of_parse_and_map(best_frame, ARCH_TIMER_PHYS_SPI); + irq = best_frame->phys_irq;
- ret = -EINVAL; if (!irq) { pr_err("Frame missing %s irq", arch_timer_mem_use_virtual ? "virt" : "phys"); - goto out; + return -EINVAL; }
- /* - * Try to determine the frequency from the device tree, - * if fail, get the frequency from CNTFRQ. - */ - if (!arch_timer_rate && - of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) - arch_timer_mem_detect_rate(base); + base = ioremap(best_frame->cntbase, best_frame->size); + if (!base) { + pr_err("Can't map frame's registers\n"); + return -ENXIO; + } + + arch_timer_mem_detect_rate(base);
ret = arch_timer_mem_register(base, irq); - if (ret) + if (ret) { + iounmap(base); + return ret; + } + + arch_counter_base = base; + arch_timers_present |= ARCH_TIMER_TYPE_MEM; + + return 0; +} + +static int __init arch_timer_mem_of_init(struct device_node *np) +{ + struct arch_timer_mem *timer_mem; + struct device_node *frame_node; + struct resource res; + int i, ret = -EINVAL; + + timer_mem = kzalloc(sizeof(*timer_mem), GFP_KERNEL); + if (!timer_mem) + return -ENOMEM; + + if (of_address_to_resource(np, 0, &res)) goto out; + timer_mem->cntctlbase = res.start; + timer_mem->size = resource_size(&res); + + i = 0; + for_each_available_child_of_node(np, frame_node) { + int n; + struct arch_timer_mem_frame *frame = &timer_mem->frame[i]; + + if (of_property_read_u32(frame_node, "frame-number", &n)) { + pr_err("Missing frame-number\n"); + of_node_put(frame_node); + goto out; + } + frame->frame_nr = n; + + if (of_address_to_resource(frame_node, 0, &res)) { + of_node_put(frame_node); + goto out; + } + frame->cntbase = res.start; + frame->size = resource_size(&res); + + frame->virt_irq = irq_of_parse_and_map(frame_node, + ARCH_TIMER_VIRT_SPI); + frame->phys_irq = irq_of_parse_and_map(frame_node, + ARCH_TIMER_PHYS_SPI);
- if (!arch_timer_needs_of_probing()) + if (++i >= ARCH_TIMER_MEM_MAX_FRAMES) + break; + } + timer_mem->num_frames = i; + + /* Try to determine the frequency from the device tree */ + if (!arch_timer_rate) + of_property_read_u32(np, "clock-frequency", &arch_timer_rate); + + ret = arch_timer_mem_init(timer_mem); + if (!ret && !arch_timer_needs_of_probing()) ret = arch_timer_common_init(); out: - iounmap(cntctlbase); - of_node_put(best_frame); + kfree(timer_mem); return ret; } CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", - arch_timer_mem_init); + arch_timer_mem_of_init);
#ifdef CONFIG_ACPI static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags)
From: Fu Wei fu.wei@linaro.org
This patch adds support for parsing arch timer info in GTDT, provides some kernel APIs to parse all the PPIs and always-on info in GTDT and export them.
By this driver, we can simplify arm_arch_timer drivers, and separate the ACPI GTDT knowledge from it.
Signed-off-by: Fu Wei fu.wei@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org Acked-by: Rafael J. Wysocki rafael.j.wysocki@intel.com --- arch/arm64/Kconfig | 1 + drivers/acpi/arm64/Kconfig | 3 + drivers/acpi/arm64/Makefile | 1 + drivers/acpi/arm64/gtdt.c | 157 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 6 ++ 5 files changed, 168 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 969ef88..4277a21 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2,6 +2,7 @@ config ARM64 def_bool y select ACPI_CCA_REQUIRED if ACPI select ACPI_GENERIC_GSI if ACPI + select ACPI_GTDT if ACPI select ACPI_REDUCED_HARDWARE_ONLY if ACPI select ACPI_MCFG if ACPI select ACPI_SPCR_TABLE if ACPI diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig index 4616da4..5a6f80f 100644 --- a/drivers/acpi/arm64/Kconfig +++ b/drivers/acpi/arm64/Kconfig @@ -4,3 +4,6 @@
config ACPI_IORT bool + +config ACPI_GTDT + bool diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile index 72331f2..1017def 100644 --- a/drivers/acpi/arm64/Makefile +++ b/drivers/acpi/arm64/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_ACPI_IORT) += iort.o +obj-$(CONFIG_ACPI_GTDT) += gtdt.o diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c new file mode 100644 index 0000000..d93a790 --- /dev/null +++ b/drivers/acpi/arm64/gtdt.c @@ -0,0 +1,157 @@ +/* + * ARM Specific GTDT table Support + * + * Copyright (C) 2016, Linaro Ltd. + * Author: Daniel Lezcano daniel.lezcano@linaro.org + * Fu Wei fu.wei@linaro.org + * Hanjun Guo hanjun.guo@linaro.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> +#include <linux/init.h> +#include <linux/kernel.h> + +#include <clocksource/arm_arch_timer.h> + +#undef pr_fmt +#define pr_fmt(fmt) "ACPI GTDT: " fmt + +/** + * struct acpi_gtdt_descriptor - Store the key info of GTDT for all functions + * @gtdt: The pointer to the struct acpi_table_gtdt of GTDT table. + * @gtdt_end: The pointer to the end of GTDT table. + * @platform_timer: The pointer to the start of Platform Timer Structure + * + * The struct store the key info of GTDT table, it should be initialized by + * acpi_gtdt_init. + */ +struct acpi_gtdt_descriptor { + struct acpi_table_gtdt *gtdt; + void *gtdt_end; + void *platform_timer; +}; + +static struct acpi_gtdt_descriptor acpi_gtdt_desc __initdata; + +static int __init map_gt_gsi(u32 interrupt, u32 flags) +{ + int trigger, polarity; + + trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE + : ACPI_LEVEL_SENSITIVE; + + polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW + : ACPI_ACTIVE_HIGH; + + return acpi_register_gsi(NULL, interrupt, trigger, polarity); +} + +/** + * acpi_gtdt_map_ppi() - Map the PPIs of per-cpu arch_timer. + * @type: the type of PPI. + * + * Note: Linux on arm64 isn't supported on the secure side. + * So we only handle the non-secure timer PPIs, + * ARCH_TIMER_PHYS_SECURE_PPI is treated as invalid type. + * + * Return: the mapped PPI value, 0 if error. + */ +int __init acpi_gtdt_map_ppi(int type) +{ + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; + + switch (type) { + case ARCH_TIMER_PHYS_NONSECURE_PPI: + return map_gt_gsi(gtdt->non_secure_el1_interrupt, + gtdt->non_secure_el1_flags); + case ARCH_TIMER_VIRT_PPI: + return map_gt_gsi(gtdt->virtual_timer_interrupt, + gtdt->virtual_timer_flags); + + case ARCH_TIMER_HYP_PPI: + return map_gt_gsi(gtdt->non_secure_el2_interrupt, + gtdt->non_secure_el2_flags); + default: + pr_err("Failed to map timer interrupt: invalid type.\n"); + } + + return 0; +} + +/** + * acpi_gtdt_c3stop() - Got c3stop info from GTDT according to the type of PPI. + * @type: the type of PPI. + * + * Return: 1 if the timer can be in deep idle state, 0 otherwise. + */ +bool __init acpi_gtdt_c3stop(int type) +{ + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; + + switch (type) { + case ARCH_TIMER_PHYS_NONSECURE_PPI: + return !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); + + case ARCH_TIMER_VIRT_PPI: + return !(gtdt->virtual_timer_flags & ACPI_GTDT_ALWAYS_ON); + + case ARCH_TIMER_HYP_PPI: + return !(gtdt->non_secure_el2_flags & ACPI_GTDT_ALWAYS_ON); + + default: + pr_err("Failed to get c3stop info: invalid type.\n"); + } + + return 0; +} + +/** + * acpi_gtdt_init() - Get the info of GTDT table to prepare for further init. + * @table: The pointer to GTDT table. + * @platform_timer_count: The pointer of int variate for returning the + * number of platform timers. It can be NULL, if + * driver don't need this info. + * + * Return: 0 if success, -EINVAL if error. + */ +int __init acpi_gtdt_init(struct acpi_table_header *table, + int *platform_timer_count) +{ + int ret = 0; + int timer_count = 0; + void *platform_timer = NULL; + struct acpi_table_gtdt *gtdt; + + gtdt = container_of(table, struct acpi_table_gtdt, header); + acpi_gtdt_desc.gtdt = gtdt; + acpi_gtdt_desc.gtdt_end = (void *)table + table->length; + + if (table->revision < 2) + pr_debug("Revision:%d doesn't support Platform Timers.\n", + table->revision); + else if (!gtdt->platform_timer_count) + pr_debug("No Platform Timer.\n"); + else + timer_count = gtdt->platform_timer_count; + + if (timer_count) { + platform_timer = (void *)gtdt + gtdt->platform_timer_offset; + if (platform_timer < (void *)table + + sizeof(struct acpi_table_gtdt)) { + pr_err(FW_BUG "invalid timer data.\n"); + timer_count = 0; + platform_timer = NULL; + ret = -EINVAL; + } + } + + acpi_gtdt_desc.platform_timer = platform_timer; + if (platform_timer_count) + *platform_timer_count = timer_count; + + return ret; +} diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 61a3d90..d201ce4 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -577,6 +577,12 @@ enum acpi_reconfig_event { int acpi_reconfig_notifier_register(struct notifier_block *nb); int acpi_reconfig_notifier_unregister(struct notifier_block *nb);
+#ifdef CONFIG_ACPI_GTDT +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); +#endif + #else /* !CONFIG_ACPI */
#define acpi_disabled 1
From: Fu Wei fu.wei@linaro.org
The patch update arm_arch_timer driver to use the function provided by the new GTDT driver of ACPI. By this way, arm_arch_timer.c can be simplified, and separate all the ACPI GTDT knowledge from this timer driver.
Signed-off-by: Fu Wei fu.wei@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org Tested-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- drivers/clocksource/arm_arch_timer.c | 47 +++++++++++------------------------- 1 file changed, 14 insertions(+), 33 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index bcdceca..7f059f9 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -1053,58 +1053,36 @@ static int __init arch_timer_mem_of_init(struct device_node *np) CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", arch_timer_mem_of_init);
-#ifdef CONFIG_ACPI -static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) -{ - int trigger, polarity; - - if (!interrupt) - return 0; - - trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE - : ACPI_LEVEL_SENSITIVE; - - polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW - : ACPI_ACTIVE_HIGH; - - return acpi_register_gsi(NULL, interrupt, trigger, polarity); -} - +#ifdef CONFIG_ACPI_GTDT /* Initialize per-processor generic timer */ static int __init arch_timer_acpi_init(struct acpi_table_header *table) { - struct acpi_table_gtdt *gtdt; + int ret;
if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("already initialized, skipping\n"); return -EINVAL; }
- gtdt = container_of(table, struct acpi_table_gtdt, header); - arch_timers_present |= ARCH_TIMER_TYPE_CP15;
- arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] = - map_generic_timer_interrupt(gtdt->secure_el1_interrupt, - gtdt->secure_el1_flags); + ret = acpi_gtdt_init(table, NULL); + if (ret) { + pr_err("Failed to init GTDT table.\n"); + return ret; + }
arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI] = - map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, - gtdt->non_secure_el1_flags); + acpi_gtdt_map_ppi(ARCH_TIMER_PHYS_NONSECURE_PPI);
arch_timer_ppi[ARCH_TIMER_VIRT_PPI] = - map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, - gtdt->virtual_timer_flags); + acpi_gtdt_map_ppi(ARCH_TIMER_VIRT_PPI);
arch_timer_ppi[ARCH_TIMER_HYP_PPI] = - map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, - gtdt->non_secure_el2_flags); + acpi_gtdt_map_ppi(ARCH_TIMER_HYP_PPI);
arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
- /* Get the frequency from CNTFRQ */ - arch_timer_detect_rate(); - arch_timer_uses_ppi = arch_timer_select_ppi(); if (!arch_timer_ppi[arch_timer_uses_ppi]) { pr_err("No interrupt available, giving up\n"); @@ -1112,7 +1090,10 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) }
/* Always-on capability */ - arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); + arch_timer_c3stop = acpi_gtdt_c3stop(arch_timer_uses_ppi); + + /* Get the frequency from CNTFRQ */ + arch_timer_detect_rate();
ret = arch_timer_register(); if (ret)
From: Fu Wei fu.wei@linaro.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@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- drivers/acpi/arm64/gtdt.c | 124 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 1 + 2 files changed, 125 insertions(+)
diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c index d93a790..91ea6cb 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 +177,105 @@ 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 *data) +{ + int i; + struct acpi_gtdt_timer_entry *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; + } + + data->cntctlbase = (phys_addr_t)block->block_address; + /* + * According to "Table * CNTCTLBase memory map" of + * <ARM Architecture Reference Manual> for ARMv8, + * The size of the CNTCTLBase frame is 4KB(Offset 0x000 – 0xFFC). + */ + data->size = SZ_4K; + data->num_frames = block->timer_count; + + frame = (void *)block + block->timer_offset; + if (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; i < block->timer_count; i++, frame++) { + if (!frame->base_address || !frame->timer_interrupt) + return -EINVAL; + + data->frame[i].phys_irq = map_gt_gsi(frame->timer_interrupt, + frame->timer_flags); + if (data->frame[i].phys_irq <= 0) { + pr_warn("failed to map physical timer irq in frame %d.\n", + i); + return -EINVAL; + } + + data->frame[i].virt_irq = + map_gt_gsi(frame->virtual_timer_interrupt, + frame->virtual_timer_flags); + if (data->frame[i].virt_irq <= 0) { + pr_warn("failed to map virtual timer irq in frame %d.\n", + i); + acpi_unregister_gsi(frame->timer_interrupt); + return -EINVAL; + } + + data->frame[i].frame_nr = frame->frame_number; + data->frame[i].cntbase = frame->base_address; + /* + * According to "Table * CNTBaseN memory map" of + * <ARM Architecture Reference Manual> for ARMv8, + * The size of the CNTBaseN frame is 4KB(Offset 0x000 – 0xFFC). + */ + data->frame[i].size = SZ_4K; + } + + return 0; +} + +/** + * acpi_arch_timer_mem_init() - Get the info of all GT blocks in GTDT table. + * @data: 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. + * + * Return: 0 if success, -EINVAL/-ENODEV if error. + */ +int __init acpi_arch_timer_mem_init(struct arch_timer_mem *data, + 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, data); + if (ret) + return ret; + data++; + (*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 d201ce4..f5881de 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -581,6 +581,7 @@ 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 *data, int *timer_count); #endif
#else /* !CONFIG_ACPI */
From: Fu Wei fu.wei@linaro.org
The patch add memory-mapped timer register support by using the information provided by the new GTDT driver of ACPI.
Signed-off-by: Fu Wei fu.wei@linaro.org --- drivers/clocksource/arm_arch_timer.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 7f059f9..1fe1c08 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -1054,10 +1054,36 @@ CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", arch_timer_mem_of_init);
#ifdef CONFIG_ACPI_GTDT -/* Initialize per-processor generic timer */ +static int __init arch_timer_mem_acpi_init(int platform_timer_count) +{ + struct arch_timer_mem *timer_mem; + int timer_count, i, ret; + + timer_mem = kcalloc(platform_timer_count, sizeof(*timer_mem), + GFP_KERNEL); + if (!timer_mem) + return -ENOMEM; + + ret = acpi_arch_timer_mem_init(timer_mem, &timer_count); + if (ret || !timer_count) + goto error; + + for (i = 0; i < timer_count; i++) { + ret = arch_timer_mem_init(timer_mem); + if (!ret) + break; + timer_mem++; + } + +error: + kfree(timer_mem); + return ret; +} + +/* Initialize per-processor generic timer and memory-mapped timer(if present) */ static int __init arch_timer_acpi_init(struct acpi_table_header *table) { - int ret; + int ret, platform_timer_count;
if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("already initialized, skipping\n"); @@ -1066,7 +1092,7 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
arch_timers_present |= ARCH_TIMER_TYPE_CP15;
- ret = acpi_gtdt_init(table, NULL); + ret = acpi_gtdt_init(table, &platform_timer_count); if (ret) { pr_err("Failed to init GTDT table.\n"); return ret; @@ -1099,6 +1125,9 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) if (ret) return ret;
+ if (arch_timer_mem_acpi_init(platform_timer_count)) + pr_err("Failed to initialize memory-mapped timer.\n"); + return arch_timer_common_init(); } CLOCKSOURCE_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init);
From: Fu Wei fu.wei@linaro.org
This driver adds support for parsing SBSA Generic Watchdog timer in GTDT, parse all info in SBSA Generic Watchdog Structure in GTDT, and creating a platform device with that information.
This allows the operating system to obtain device data from the resource of platform device. The platform device named "sbsa-gwdt" can be used by the ARM SBSA Generic Watchdog driver.
Signed-off-by: Fu Wei fu.wei@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org Tested-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- drivers/acpi/arm64/gtdt.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/watchdog/Kconfig | 1 + 2 files changed, 94 insertions(+)
diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c index 91ea6cb..22d3659 100644 --- a/drivers/acpi/arm64/gtdt.c +++ b/drivers/acpi/arm64/gtdt.c @@ -14,6 +14,7 @@ #include <linux/acpi.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/platform_device.h>
#include <clocksource/arm_arch_timer.h>
@@ -59,6 +60,13 @@ static inline bool is_timer_block(void *platform_timer) return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK; }
+static inline bool is_watchdog(void *platform_timer) +{ + struct acpi_gtdt_header *gh = platform_timer; + + return gh->type == ACPI_GTDT_TYPE_WATCHDOG; +} + static int __init map_gt_gsi(u32 interrupt, u32 flags) { int trigger, polarity; @@ -279,3 +287,88 @@ int __init acpi_arch_timer_mem_init(struct arch_timer_mem *data,
return 0; } + +/* + * Initialize a SBSA generic Watchdog platform device info from GTDT + */ +static int __init gtdt_import_sbsa_gwdt(struct acpi_gtdt_watchdog *wd, + int index) +{ + struct platform_device *pdev; + int irq = map_gt_gsi(wd->timer_interrupt, wd->timer_flags); + int no_irq = 1; + + /* + * According to SBSA specification the size of refresh and control + * frames of SBSA Generic Watchdog is SZ_4K(Offset 0x000 – 0xFFF). + */ + struct resource res[] = { + DEFINE_RES_MEM(wd->control_frame_address, SZ_4K), + DEFINE_RES_MEM(wd->refresh_frame_address, SZ_4K), + DEFINE_RES_IRQ(irq), + }; + + pr_debug("found a Watchdog (0x%llx/0x%llx gsi:%u flags:0x%x).\n", + wd->refresh_frame_address, wd->control_frame_address, + wd->timer_interrupt, wd->timer_flags); + + if (!(wd->refresh_frame_address && wd->control_frame_address)) { + pr_err(FW_BUG "failed to get the Watchdog base address.\n"); + return -EINVAL; + } + + if (!wd->timer_interrupt) + pr_warn(FW_BUG "failed to get the Watchdog interrupt.\n"); + else if (irq <= 0) + pr_warn("failed to map the Watchdog interrupt.\n"); + else + no_irq = 0; + + /* + * Add a platform device named "sbsa-gwdt" to match the platform driver. + * "sbsa-gwdt": SBSA(Server Base System Architecture) Generic Watchdog + * The platform driver (like drivers/watchdog/sbsa_gwdt.c)can get device + * info below by matching this name. + */ + pdev = platform_device_register_simple("sbsa-gwdt", index, res, + ARRAY_SIZE(res) - no_irq); + if (IS_ERR(pdev)) { + acpi_unregister_gsi(wd->timer_interrupt); + return PTR_ERR(pdev); + } + + return 0; +} + +static int __init gtdt_sbsa_gwdt_init(void) +{ + int ret, i = 0; + void *platform_timer; + struct acpi_table_header *table; + + if (acpi_disabled) + return 0; + + if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_GTDT, 0, &table))) + return -EINVAL; + + ret = acpi_gtdt_init(table, NULL); + if (ret) + return ret; + + for_each_platform_timer(platform_timer) { + if (is_watchdog(platform_timer)) { + ret = gtdt_import_sbsa_gwdt(platform_timer, i); + if (ret) + break; + i++; + } + } + + if (i) + pr_info("found %d SBSA generic Watchdog(s).\n", i); + + return ret; +} + +device_initcall(gtdt_sbsa_gwdt_init); diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index fdd3228..e5ba1f0 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -218,6 +218,7 @@ config ARM_SBSA_WATCHDOG tristate "ARM SBSA Generic Watchdog" depends on ARM64 depends on ARM_ARCH_TIMER + depends on ACPI_GTDT || !ACPI select WATCHDOG_CORE help ARM SBSA Generic Watchdog has two stage timeouts:
-
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