在 2016/7/1 18:32, Marc Zyngier 写道:
On 01/07/16 02:24, Shawn Lin wrote:
This patch adds Rockchip PCIe controller support found
on RK3399 Soc platform.
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
[...]
+static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct rockchip_pcie_port *port;
+ u32 reg;
+
+ chained_irq_enter(chip, desc);
+ port = irq_desc_get_handler_data(desc);
+
+ reg = pcie_read(port, PCIE_CLIENT_INT_STATUS);
+ reg = (reg & ROCKCHIP_PCIE_RPIFR1_INTR_MASK) >>
+ ROCKCHIP_PCIE_RPIFR1_INTR_SHIFT;
+ if (reg)
+ generic_handle_irq(irq_find_mapping(port->irq_domain,
+ ffs(reg)));
Can't you get multiple pending interrupts at the same time? Here, you
seem to only process one interrupt at a time, which is going to be
pretty inefficient.
Yup, will fix it, thanks.
How about something like:
while (reg) {
int hwirq = ffs(reg);
int irq;
reg &= ~BIT(hwirq);
irq = irq_find_mapping(port->irq_domain, hwirq);
if (irq)
generic_handle_irq(irq);
}
+ chained_irq_exit(chip, desc);
+}
+
Thanks,
M.
--
Best Regards
Shawn Lin
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