diff mbox

[v3,7/9] KVM: arm/arm64: arch_timer: Rely on the arch timer to parse the firmware tables

Message ID 1457436573-6180-8-git-send-email-julien.grall@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Julien Grall March 8, 2016, 11:29 a.m. UTC 
The firmware table is currently parsed by the virtual timer code in
order to retrieve the virtual timer interrupt. However, this is already
done by the arch timer driver.

To avoid code duplication, use the newly function arch_timer_get_kvm_info()
which return all the information required by the virtual timer code.

Signed-off-by: Julien Grall <julien.grall@arm.com>

---
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>

    Changes in v3:
        - Patch added
---
 virt/kvm/arm/arch_timer.c | 40 +++++++++++-----------------------------
 1 file changed, 11 insertions(+), 29 deletions(-)

Comments

Christoffer Dall March 9, 2016, 5:55 a.m. UTC | #1 
On Tue, Mar 08, 2016 at 11:29:31AM +0000, Julien Grall wrote:
> The firmware table is currently parsed by the virtual timer code in
> order to retrieve the virtual timer interrupt. However, this is already
> done by the arch timer driver.
> 
> To avoid code duplication, use the newly function arch_timer_get_kvm_info()
> which return all the information required by the virtual timer code.
> 
> Signed-off-by: Julien Grall <julien.grall@arm.com>
> 
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
diff mbox

Patch

diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index a9ad4fe..c6a6f8e 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -17,7 +17,6 @@ 
  */
 
 #include <linux/cpu.h>
-#include <linux/of_irq.h>
 #include <linux/kvm.h>
 #include <linux/kvm_host.h>
 #include <linux/interrupt.h>
@@ -409,45 +408,29 @@  static struct notifier_block kvm_timer_cpu_nb = {
 	.notifier_call = kvm_timer_cpu_notify,
 };
 
-static const struct of_device_id arch_timer_of_match[] = {
-	{ .compatible	= "arm,armv7-timer",	},
-	{ .compatible	= "arm,armv8-timer",	},
-	{},
-};
-
 int kvm_timer_hyp_init(void)
 {
-	struct device_node *np;
-	unsigned int ppi;
+	struct arch_timer_kvm_info *info;
 	int err;
 
-	timecounter = arch_timer_get_timecounter();
-	if (!timecounter)
-		return -ENODEV;
+	info = arch_timer_get_kvm_info();
+	timecounter = &info->timecounter;
 
-	np = of_find_matching_node(NULL, arch_timer_of_match);
-	if (!np) {
-		kvm_err("kvm_arch_timer: can't find DT node\n");
+	if (info->virtual_irq <= 0) {
+		kvm_err("kvm_arch_timer: invalid virtual timer IRQ: %d\n",
+			info->virtual_irq);
 		return -ENODEV;
 	}
+	host_vtimer_irq = info->virtual_irq;
 
-	ppi = irq_of_parse_and_map(np, 2);
-	if (!ppi) {
-		kvm_err("kvm_arch_timer: no virtual timer interrupt\n");
-		err = -EINVAL;
-		goto out;
-	}
-
-	err = request_percpu_irq(ppi, kvm_arch_timer_handler,
+	err = request_percpu_irq(host_vtimer_irq, kvm_arch_timer_handler,
 				 "kvm guest timer", kvm_get_running_vcpus());
 	if (err) {
 		kvm_err("kvm_arch_timer: can't request interrupt %d (%d)\n",
-			ppi, err);
+			host_vtimer_irq, err);
 		goto out;
 	}
 
-	host_vtimer_irq = ppi;
-
 	err = __register_cpu_notifier(&kvm_timer_cpu_nb);
 	if (err) {
 		kvm_err("Cannot register timer CPU notifier\n");
@@ -460,14 +443,13 @@  int kvm_timer_hyp_init(void)
 		goto out_free;
 	}
 
-	kvm_info("%s IRQ%d\n", np->name, ppi);
+	kvm_info("virtual timer IRQ%d\n", host_vtimer_irq);
 	on_each_cpu(kvm_timer_init_interrupt, NULL, 1);
 
 	goto out;
 out_free:
-	free_percpu_irq(ppi, kvm_get_running_vcpus());
+	free_percpu_irq(host_vtimer_irq, kvm_get_running_vcpus());
 out:
-	of_node_put(np);
 	return err;
 }