AM625: Can't set affinity for some interrupts

Shine

Genius 13655 points

Part Number: AM625

Hello Champs,

SDK: 08.03.00.19

Real Time (RT) Linux Kernel

RT Kernel Version: 5.10.109-rt65

Kernel defconfig: ti_sdk_arm64_rt_release_defconfig

uboot enviroment variables：

setenv args_all setenv optargs earlycon=ns16550a,mmio32,0x02800000 isolcpus=1-3

root@ok6254:echo 2>/proc/irq/378/smp_affinity_list
-sh:echo:write error：input/output error

Some interrupts e.g i2c no.16 can set the affinity, but other interrupts affinity can't work.

Thanks
Regards,
Shine

over 2 years ago

0 Schuyler Patton over 2 years ago

TI__Mastermind 39460 points

Hi,

I see an issue being tracked in the release notes concerning IRQ balance. I will need to discuss with the development team. I will have an answer in the next day or two.

Best Regards,

Schuyler

0 Schuyler Patton over 2 years ago in reply to Schuyler Patton

TI__Mastermind 39460 points

Hi,

This issue was fixed in the 8.6 SDK which is available now.

Best Regards,

Schuyler

0 坚斌李 over 2 years ago

Prodigy 100 points

I tested it, but it still doesn't work.

Here are my test conditions：

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root@ok6254:~# uname -a
Linux ok6254 5.10.168-g2c23e6c538 #1 SMP PREEMPT Fri Mar 31 13:24:31 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux
root@ok6254:~# echo 4 > /proc/irq/317/smp_affinity
-sh: echo: write error: Input/output error
root@ok6254:~# cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3
 11:      59261         63         63         62     GICv3  30 Level     arch_timer
 14:          0          0          0          0     GICv3  23 Level     arm-pmu
 16:          0          0          0          0     GICv3 139 Level     4900000.i2c
 17:          0          0          0          0     GICv3 208 Level     4b00000.spi
 18:          0          0          0          0     GICv3 209 Level     4b10000.spi
 20:          0          0          0          0     GICv3 197 Level     2b200000.i2c
 21:        559          0          0          0     GICv3  66 Level     4d000000.mailbox thr_012
 22:       3640          0          0         30     GICv3 210 Level     2800000.serial
 25:          0          0          0          0     GICv3 194 Level     20010000.i2c
 26:          0          0          0          0     GICv3 195 Level     20020000.i2c
 27:          0          0          0          0     GICv3 196 Level     20030000.i2c
 28:          0          0          0          0     GICv3 204 Level     20100000.spi
 29:          0          0          0          0     GICv3 205 Level     20110000.spi
 30:          0          0          0          0     GICv3 206 Level     20120000.spi
 31:       3599          0          0          0     GICv3 165 Level     mmc0
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

root@ok6254:~# uname -a
Linux ok6254 5.10.168-g2c23e6c538 #1 SMP PREEMPT Fri Mar 31 13:24:31 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux
root@ok6254:~# echo 4 > /proc/irq/317/smp_affinity
-sh: echo: write error: Input/output error
root@ok6254:~# cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3
 11:      59261         63         63         62     GICv3  30 Level     arch_timer
 14:          0          0          0          0     GICv3  23 Level     arm-pmu
 16:          0          0          0          0     GICv3 139 Level     4900000.i2c
 17:          0          0          0          0     GICv3 208 Level     4b00000.spi
 18:          0          0          0          0     GICv3 209 Level     4b10000.spi
 20:          0          0          0          0     GICv3 197 Level     2b200000.i2c
 21:        559          0          0          0     GICv3  66 Level     4d000000.mailbox thr_012
 22:       3640          0          0         30     GICv3 210 Level     2800000.serial
 25:          0          0          0          0     GICv3 194 Level     20010000.i2c
 26:          0          0          0          0     GICv3 195 Level     20020000.i2c
 27:          0          0          0          0     GICv3 196 Level     20030000.i2c
 28:          0          0          0          0     GICv3 204 Level     20100000.spi
 29:          0          0          0          0     GICv3 205 Level     20110000.spi
 30:          0          0          0          0     GICv3 206 Level     20120000.spi
 31:       3599          0          0          0     GICv3 165 Level     mmc0
 32:       1373          0          0          0     GICv3 115 Level     mmc1
 33:        193          0          0          0     GICv3 114 Level     mmc2
 35:          0          0          0          0     GICv3 171 Level     fc40000.spi
 44:          0          0          0          0     GICv3 267 Level     2b00000.mcasp_rx
 45:          0          0          0          0     GICv3 268 Level     2b00000.mcasp_tx
 46:          0          0          0          0  MSI-INTA 1713152 Level     485c0100.dma-controller chan0
 64:          0          0          0          0  MSI-INTA 1714176 Edge      485c0100.dma-controller chan1
 76:          0          0          0          0  MSI-INTA 1714688 Level     485c0100.dma-controller chan1
 94:          0          0          0          0  MSI-INTA 1715718 Edge      485c0100.dma-controller chan2
112:          0          0          0          0  MSI-INTA 1716230 Level     485c0100.dma-controller chan2
134:          0          0          0          0  MSI-INTA 1970707 Level     8000000.ethernet-tx0
224:          0          0          0          0  MSI-INTA 1971731 Level     8000000.ethernet
257:          0          0          0          0     GICv3 134 Level     8000000.ethernet
317:          0          0          0          0      GPIO  22 Edge    -davinci_gpio  key1
IPI0:        33         14         13         13       Rescheduling interrupts
IPI1:         1         28         28         28       Function call interrupts
IPI2:         0          0          0          0       CPU stop interrupts
IPI3:         0          0          0          0       CPU stop (for crash dump) interrupts
IPI4:         0          0          0          0       Timer broadcast interrupts
IPI5:         0          0          0          0       IRQ work interrupts
IPI6:         0          0          0          0       CPU wake-up interrupts
Err:          0

and my interrupt request code and device tree：

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//probe
static int temp_probe (struct platform_device *pdev)
{
    int ret = -1;
    cpumask_t mask;
    nd = of_find_node_by_path("/inc_1");
    if (NULL == nd) {
        printk("find /out_control fail\n");
    }
    out1 = of_irq_get(nd, 0);
    
    ret = request_irq( out1, do_key, IRQF_TRIGGER_RISING, "key1", pdev);
    if (ret) {
        printk("request irq1 error\n");
        return -EBUSY;
    }
    
    return 0;
}
//device tree
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

//probe
static int temp_probe (struct platform_device *pdev)
{
	int ret = -1;
	cpumask_t mask;
	nd = of_find_node_by_path("/inc_1");
	if (NULL == nd) {
		printk("find /out_control fail\n");
	}
	out1 = of_irq_get(nd, 0);
	
	ret = request_irq( out1, do_key, IRQF_TRIGGER_RISING, "key1", pdev);
	if (ret) {
		printk("request irq1 error\n");
		return -EBUSY;
	}
	
	return 0;
}

//device tree
inc_1 {
        compatible = "inc_1";
	 	pinctrl-names = "default";
		pinctrl-0 = <&outc_pins_default>;
		interrupt-parent = <&main_gpio0>;
		interrupts =  <22 IRQ_TYPE_EDGE_RISING>;
		status = "okay";
};

The interrupt function is working properly

0 坚斌李 over 2 years ago in reply to Schuyler Patton

Prodigy 100 points

I tested it, but it still doesn't work.The test results can be found in the latest comments on this issue

0 Pekka Varis over 2 years ago in reply to 坚斌李

TI__Mastermind 25760 points

8.6 had the interrupt affinity improvement for Ethernet, so Ethernet related interrupts are no longer tied to CPU0. There are still some interrupts that are not movable.

Can you clarify, you have " isolcpus=1-3" as a kernel command line option. So this means you are trying to have everything one CPU0 ? So is the concern:

22: 3640 0 0 30 GICv3 210 Level 2800000.serial

Pekka

Processors

Processors forum

AM625: Can't set affinity for some interrupts