diff mbox series

[v2,2/2] PCI: hv: Refactor hv_irq_unmask() to use cpumask_to_vpset()

Message ID 4b94f3bb88f56e4c5ca05c1c6ee73f9c6c6a88e7.1548489092.git.m.maya.nakamura@gmail.com
State Superseded
Delegated to: Lorenzo Pieralisi
Headers show
Series PCI: hv: Refactor hv_irq_unmask() to use hv_vpset and cpumask_to_vpset() | expand

Commit Message

Maya Nakamura Jan. 26, 2019, 8:55 a.m. UTC 
Remove the duplicate implementation of cpumask_to_vpset() and use the
shared implementation. Export hv_max_vp_index, which is required by
cpumask_to_vpset().

Apply changes to hv_irq_unmask() based on feedback.

Signed-off-by: Maya Nakamura <m.maya.nakamura@gmail.com>
---
Changes in v2:
 - Remove unnecessary nr_bank initialization.
 - Delete two unnecessary dev_err()'s.
 - Unlock before returning.

 arch/x86/hyperv/hv_init.c           |  1 +
 drivers/pci/controller/pci-hyperv.c | 38 +++++++++++++----------------
 2 files changed, 18 insertions(+), 21 deletions(-)

Comments

Maya Nakamura Jan. 29, 2019, 5:52 a.m. UTC | #1 
On Sun, Jan 27, 2019 at 05:22:06AM +0000, Michael Kelley wrote:
> From: Maya Nakamura <m.maya.nakamura@gmail.com>  Sent: Saturday, January 26, 2019 12:55 AM
> >
> > @@ -953,29 +951,27 @@ static void hv_irq_unmask(struct irq_data *data)
> >  		 */
> >  		params->int_target.flags |=
> >  			HV_DEVICE_INTERRUPT_TARGET_PROCESSOR_SET;
> > -		params->int_target.vp_set.valid_bank_mask =
> > -			(1ull << HV_VP_SET_BANK_COUNT_MAX) - 1;
> > +
> > +		if (!alloc_cpumask_var(&tmp, GFP_KERNEL)) {
> > +			res = 1;
> > +			goto exit_unlock;
> > +		}
> > +
> > +		cpumask_and(tmp, dest, cpu_online_mask);
> > +		nr_bank = cpumask_to_vpset(&params->int_target.vp_set, tmp);
> > +		free_cpumask_var(tmp);
> > +
> > +		if (!nr_bank) {
> 
> There are two failures cases in cpumask_to_vpset().  One case returns
> 0, and the other case returns -1.  The above test only catches the 0
> failure case.  Need to modify the test to catch both cases.
> 
> Michael
> 
Thank you for your feedback. I will correct it in v3.

Maya

> > +			res = 1;
> > +			goto exit_unlock;
> > +		}
> > 
>
diff mbox series

Patch

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 7abb09e2eeb8..7f2eed1fc81b 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -96,6 +96,7 @@  void  __percpu **hyperv_pcpu_input_arg;
 EXPORT_SYMBOL_GPL(hyperv_pcpu_input_arg);
 
 u32 hv_max_vp_index;
+EXPORT_SYMBOL_GPL(hv_max_vp_index);
 
 static int hv_cpu_init(unsigned int cpu)
 {
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index da8b58d8630d..d74c0f111fd0 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -391,8 +391,6 @@  struct hv_interrupt_entry {
 	u32	data;
 };
 
-#define HV_VP_SET_BANK_COUNT_MAX	5 /* current implementation limit */
-
 /*
  * flags for hv_device_interrupt_target.flags
  */
@@ -908,12 +906,12 @@  static void hv_irq_unmask(struct irq_data *data)
 	struct retarget_msi_interrupt *params;
 	struct hv_pcibus_device *hbus;
 	struct cpumask *dest;
+	cpumask_var_t tmp;
 	struct pci_bus *pbus;
 	struct pci_dev *pdev;
 	unsigned long flags;
 	u32 var_size = 0;
-	int cpu_vmbus;
-	int cpu;
+	int cpu, nr_bank;
 	u64 res;
 
 	dest = irq_data_get_effective_affinity_mask(data);
@@ -953,29 +951,27 @@  static void hv_irq_unmask(struct irq_data *data)
 		 */
 		params->int_target.flags |=
 			HV_DEVICE_INTERRUPT_TARGET_PROCESSOR_SET;
-		params->int_target.vp_set.valid_bank_mask =
-			(1ull << HV_VP_SET_BANK_COUNT_MAX) - 1;
+
+		if (!alloc_cpumask_var(&tmp, GFP_KERNEL)) {
+			res = 1;
+			goto exit_unlock;
+		}
+
+		cpumask_and(tmp, dest, cpu_online_mask);
+		nr_bank = cpumask_to_vpset(&params->int_target.vp_set, tmp);
+		free_cpumask_var(tmp);
+
+		if (!nr_bank) {
+			res = 1;
+			goto exit_unlock;
+		}
 
 		/*
 		 * var-sized hypercall, var-size starts after vp_mask (thus
 		 * vp_set.format does not count, but vp_set.valid_bank_mask
 		 * does).
 		 */
-		var_size = 1 + HV_VP_SET_BANK_COUNT_MAX;
-
-		for_each_cpu_and(cpu, dest, cpu_online_mask) {
-			cpu_vmbus = hv_cpu_number_to_vp_number(cpu);
-
-			if (cpu_vmbus >= HV_VP_SET_BANK_COUNT_MAX * 64) {
-				dev_err(&hbus->hdev->device,
-					"too high CPU %d", cpu_vmbus);
-				res = 1;
-				goto exit_unlock;
-			}
-
-			params->int_target.vp_set.bank_contents[cpu_vmbus / 64]	|=
-				(1ULL << (cpu_vmbus & 63));
-		}
+		var_size = 1 + nr_bank;
 	} else {
 		for_each_cpu_and(cpu, dest, cpu_online_mask) {
 			params->int_target.vp_mask |=