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RISC-V: Rename and move plic_find_hart_id() to arch directory

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The plic_find_hart_id() can be useful to other interrupt controller
drivers (such as RISC-V local interrupt driver) so we rename this
function to riscv_of_parent_hartid() and place it in arch directory
along with riscv_of_processor_hartid().

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Anup Patel 2020-06-01 14:45:39 +05:30 committed by Palmer Dabbelt
parent 5cf998ba8c
commit d175d699df
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GPG Key ID: 2E1319F35FBB1889
3 changed files with 18 additions and 15 deletions
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1
arch/riscv/include/asm/processor.h
View File

@ -75,6 +75,7 @@ static inline void wait_for_interrupt(void)
struct device_node;
int riscv_of_processor_hartid(struct device_node *node);
int riscv_of_parent_hartid(struct device_node *node);
extern void riscv_fill_hwcap(void);

16
arch/riscv/kernel/cpu.c
View File

@ -44,6 +44,22 @@ int riscv_of_processor_hartid(struct device_node *node)
return hart;
}
/*
* Find hart ID of the CPU DT node under which given DT node falls.
*
* To achieve this, we walk up the DT tree until we find an active
* RISC-V core (HART) node and extract the cpuid from it.
*/
int riscv_of_parent_hartid(struct device_node *node)
{
for (; node; node = node->parent) {
if (of_device_is_compatible(node, "riscv"))
return riscv_of_processor_hartid(node);
}
return -1;
}
#ifdef CONFIG_PROC_FS
static void print_isa(struct seq_file *f, const char *isa)

16
drivers/irqchip/irq-sifive-plic.c
View File

@ -240,20 +240,6 @@ static void plic_handle_irq(struct pt_regs *regs)
csr_set(CSR_IE, IE_EIE);
}
/*
* Walk up the DT tree until we find an active RISC-V core (HART) node and
* extract the cpuid from it.
*/
static int plic_find_hart_id(struct device_node *node)
{
for (; node; node = node->parent) {
if (of_device_is_compatible(node, "riscv"))
return riscv_of_processor_hartid(node);
}
return -1;
}
static void plic_set_threshold(struct plic_handler *handler, u32 threshold)
{
/* priority must be > threshold to trigger an interrupt */
@ -330,7 +316,7 @@ static int __init plic_init(struct device_node *node,
if (parent.args[0] != RV_IRQ_EXT)
continue;
hartid = plic_find_hart_id(parent.np);
hartid = riscv_of_parent_hartid(parent.np);
if (hartid < 0) {
pr_warn("failed to parse hart ID for context %d.\n", i);
continue;