Le 09/12/2024 à 08:12, Chen Wang a écrit :
From: Chen Wang <unicorn_wang@xxxxxxxxxxx>
Add driver for Sophgo SG2042 MSI interrupt controller.
Signed-off-by: Chen Wang <unicorn_wang@xxxxxxxxxxx>
...
+#define SG2042_VECTOR_MIN 64
+#define SG2042_VECTOR_MAX 95
...
+static struct irq_chip sg2042_msi_middle_irq_chip = {
const?
+ .name = "SG2042 MSI",
+ .irq_ack = sg2042_msi_irq_ack,
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+#ifdef CONFIG_SMP
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+#endif
+ .irq_compose_msi_msg = sg2042_msi_irq_compose_msi_msg,
+};
...
+static int sg2042_msi_probe(struct platform_device *pdev)
+{
+ struct of_phandle_args args = {};
+ struct sg2042_msi_data *data;
+ int ret;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(struct sg2042_msi_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->reg_clr = devm_platform_ioremap_resource_byname(pdev, "clr");
+ if (IS_ERR(data->reg_clr)) {
+ dev_err(&pdev->dev, "Failed to map clear register\n");
+ return PTR_ERR(data->reg_clr);
+ }
+
+ if (of_property_read_u64(pdev->dev.of_node, "sophgo,msi-doorbell-addr",
+ &data->doorbell_addr)) {
+ dev_err(&pdev->dev, "Unable to parse MSI doorbell addr\n");
+ return -EINVAL;
+ }
+
+ ret = of_parse_phandle_with_args(pdev->dev.of_node, "msi-ranges",
+ "#interrupt-cells", 0, &args);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to parse MSI vec base\n");
+ return ret;
+ }
+ data->irq_first = (u32)args.args[0];
+
+ ret = of_property_read_u32_index(pdev->dev.of_node, "msi-ranges",
+ args.args_count + 1, &data->num_irqs);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to parse MSI vec number\n");
+ return ret;
+ }
+
+ if (data->irq_first < SG2042_VECTOR_MIN ||
+ (data->irq_first + data->num_irqs - 1) > SG2042_VECTOR_MAX) {
+ dev_err(&pdev->dev, "msi-ranges is incorrect!\n");
+ return -EINVAL;
+ }
+
+ mutex_init(&data->msi_map_lock);
+
+ data->msi_map = bitmap_zalloc(data->num_irqs, GFP_KERNEL);
IIUC, num_irqs is between 0 and (SG2042_VECTOR_MAX - SG2042_VECTOR_MIN)
(maybe + or -1).
So around 32.
Would it make sence to use DECLARE_BITMAP(msi_map, <correct_size>) in
sg2042_msi_data to avoid this allocation and an indirection at runtime?
+ if (!data->msi_map)
+ return -ENOMEM;
+
+ ret = sg2042_msi_init_domains(data, pdev->dev.of_node);
+ if (ret)
+ bitmap_free(data->msi_map);
+
+ return ret;
+}
...
CJ
