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feat(ipc_interrupt): enable ipc delivery via interrupt in Linux
- modify the irq number in Linux dts files to reflect the 32 offset - implement and register ipc_message_handler to receive ipc notification in bao-ipcshmem driver - call bao_ipcshmem_notify in uart_rx_handler in Zephyr - modify irq number in all linux guest for ARM On success, a message like below will appear in dmesg: [ 12.881296] ipc message: freertos has received 1 uart interrupts! Tested: - qemu-aarch64-virt - linux+freertos - linux+zephyr - qemu-riscv-virt (by @josecm) - linux+freertos - rpi4 - linux+freertos Signed-off-by: Clay Chang <[email protected]>
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guests/linux/patches/v6.1/0003-bao-ipcshmem-receive-ipc-message-from-ipc-interrupt.patch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| From be0d07b654e3e1011e87df84709155683120acd3 Mon Sep 17 00:00:00 2001 | ||
| From: Clay Chang <[email protected]> | ||
| Date: Mon, 17 Jul 2023 18:49:55 +0800 | ||
| Subject: [PATCH 3/3] bao-ipcshmem: receive ipc message from ipc interrupt | ||
|
|
||
| --- | ||
| drivers/bao/bao-ipcshmem.c | 18 ++++++++++++++++++ | ||
| 1 file changed, 18 insertions(+) | ||
|
|
||
| diff --git a/drivers/bao/bao-ipcshmem.c b/drivers/bao/bao-ipcshmem.c | ||
| index e9cc304ea..9af4f6e37 100644 | ||
| --- a/drivers/bao/bao-ipcshmem.c | ||
| +++ b/drivers/bao/bao-ipcshmem.c | ||
| @@ -181,6 +181,15 @@ static struct file_operations bao_ipcshmem_fops = { | ||
| .release = bao_ipcshmem_release_fops | ||
| }; | ||
|
|
||
| +static irqreturn_t ipc_message_handler(int irq, void *data) | ||
| +{ | ||
| + struct bao_ipcshmem *bao = (struct bao_ipcshmem *)data; | ||
| + | ||
| + pr_info("ipc message: %s", (char *)bao->read_base); | ||
| + | ||
| + return IRQ_HANDLED; | ||
| +} | ||
| + | ||
| int bao_ipcshmem_register(struct platform_device *pdev) | ||
| { | ||
| int ret = 0; | ||
| @@ -194,6 +203,7 @@ int bao_ipcshmem_register(struct platform_device *pdev) | ||
| bool rd_in_range, wr_in_range, disjoint; | ||
| void* shmem_base_addr = NULL; | ||
| int id = -1; | ||
| + unsigned int irq; | ||
| struct bao_ipcshmem *bao; | ||
|
|
||
| r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
| @@ -241,6 +251,13 @@ int bao_ipcshmem_register(struct platform_device *pdev) | ||
| bao->write_base = shmem_base_addr + write_offset; | ||
| bao->physical_base = (void *)r->start; | ||
|
|
||
| + irq = platform_get_irq(pdev, 0); | ||
| + ret = devm_request_irq(&pdev->dev, irq, ipc_message_handler, IRQF_TRIGGER_RISING, bao->label, (void *)bao); | ||
| + if (ret != 0) { | ||
| + pr_err("failed to request irq: ret=%d\n", ret); | ||
| + goto err_unmap; | ||
| + } | ||
| + | ||
| cdev_init(&bao->cdev, &bao_ipcshmem_fops); | ||
| bao->cdev.owner = owner; | ||
|
|
||
| @@ -322,4 +339,5 @@ module_exit(bao_ipcshmem_exit); | ||
| MODULE_LICENSE("GPL"); | ||
| MODULE_AUTHOR("David Cerdeira"); | ||
| MODULE_AUTHOR("José Martins"); | ||
| +MODULE_AUTHOR("Clay Chang"); | ||
| MODULE_DESCRIPTION("bao ipc through shared-memory sample driver"); | ||
| -- | ||
| 2.34.1 | ||
|
|