From: Zhu Lingshan <lingshan.zhu@intel•com>
To: jasowang@redhat•com, mst@redhat•com
Cc: netdev@vger•kernel.org,
virtualization@lists•linux-foundation.org,
Zhu Lingshan <lingshan.zhu@intel•com>
Subject: [PATCH 4/7] vDPA/ifcvf: implement shared irq handlers for vqs
Date: Mon, 10 Jan 2022 13:19:44 +0800 [thread overview]
Message-ID: <20220110051947.84901-5-lingshan.zhu@intel.com> (raw)
In-Reply-To: <20220110051947.84901-1-lingshan.zhu@intel.com>
It has observed that a device may fail to alloc enough vectors on
some platforms, e.g., requires 16 vectors, but only 2 or 4 vector
slots allocated. The virt queues have to share a vector/irq under
such circumstances.
This irq handlers has to kick every queue because it is not
possible to tell which queue triggers the interrupt.
Signed-off-by: Zhu Lingshan <lingshan.zhu@intel•com>
---
drivers/vdpa/ifcvf/ifcvf_main.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 64fc78eaa1a9..19e1d1cd71a3 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -37,6 +37,21 @@ static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
return IRQ_HANDLED;
}
+static irqreturn_t ifcvf_shared_intr_handler(int irq, void *arg)
+{
+ struct ifcvf_hw *vf = arg;
+ struct vring_info *vring;
+ int i;
+
+ for (i = 0; i < vf->nr_vring; i++) {
+ vring = &vf->vring[i];
+ if (vring->cb.callback)
+ vf->vring->cb.callback(vring->cb.private);
+ }
+
+ return IRQ_HANDLED;
+}
+
static void ifcvf_free_irq_vectors(void *data)
{
pci_free_irq_vectors(data);
--
2.27.0
next prev parent reply other threads:[~2022-01-10 5:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-10 5:19 [PATCH 0/7] Supoort shared irq for virtqueues Zhu Lingshan
2022-01-10 5:19 ` [PATCH 1/7] vDPA/ifcvf: implement IO read/write helpers in the header file Zhu Lingshan
2022-01-10 5:19 ` [PATCH 2/7] vDPA/ifcvf: introduce new helpers to set config vector and vq vectors Zhu Lingshan
2022-01-10 5:19 ` [PATCH 3/7] vDPA/ifcvf: implement device MSIX vector allocation helper Zhu Lingshan
2022-01-10 5:19 ` Zhu Lingshan [this message]
2022-01-10 5:19 ` [PATCH 5/7] vDPA/ifcvf: irq request helpers for both shared and per_vq irq Zhu Lingshan
2022-01-10 5:19 ` [PATCH 6/7] vDPA/ifcvf: implement config interrupt request helper Zhu Lingshan
2022-01-10 5:19 ` [PATCH 7/7] vDPA/ifcvf: improve irq requester, to handle per_vq/shared/config irq Zhu Lingshan
-- strict thread matches above, loose matches on Subject: below --
2022-01-10 5:18 [PATCH 0/7] Supoort shared irq for virtqueues Zhu Lingshan
2022-01-10 5:18 ` [PATCH 4/7] vDPA/ifcvf: implement shared irq handlers for vqs Zhu Lingshan
2022-01-10 6:10 ` Michael S. Tsirkin
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