linux-kernel - [PATCH v10 6/9] irqchip/gicv2m: register the MSI global doorbell

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Date:	Tue,  7 Jun 2016 16:01:25 +0000
From:	Eric Auger <eric.auger@...hat.com>
To:	eric.auger@...hat.com, eric.auger.pro@...il.com,
	robin.murphy@....com, alex.williamson@...hat.com,
	will.deacon@....com, joro@...tes.org, tglx@...utronix.de,
	jason@...edaemon.net, marc.zyngier@....com,
	christoffer.dall@...aro.org, linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Bharat.Bhushan@...escale.com,
	pranav.sawargaonkar@...il.com, p.fedin@...sung.com,
	iommu@...ts.linux-foundation.org, Jean-Philippe.Brucker@....com,
	julien.grall@....com, yehuday@...vell.com
Subject: [PATCH v10 6/9] irqchip/gicv2m: register the MSI global doorbell

Use the msi-doorbell API to register the global doorbell.

Signed-off-by: Eric Auger <eric.auger@...hat.com>

---

v9 -> v10:
- introduce the registration concept in place of msi_doorbell_info
  callback

v8 -> v9:
- use global_doorbell instead of percpu_doorbells

v7 -> v8:
- gicv2m_msi_doorbell_info does not return a pointer to const
- remove spurious !v2m check
- add IOMMU_MMIO flag

v7: creation
---
 drivers/irqchip/irq-gic-v2m.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index ad0d296..11e039b 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -24,6 +24,8 @@
 #include <linux/of_pci.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/iommu.h>
+#include <linux/msi-doorbell.h>
 
 /*
 * MSI_TYPER:
@@ -366,12 +368,18 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
 		goto err_iounmap;
 	}
 
+	ret = msi_doorbell_register_global(v2m, v2m->res.start, sizeof(u32),
+					   IOMMU_WRITE | IOMMU_MMIO, false);
+	if (ret)
+		goto err_free_bm;
+
 	list_add_tail(&v2m->entry, &v2m_nodes);
 
 	pr_info("range%pR, SPI[%d:%d]\n", res,
 		v2m->spi_start, (v2m->spi_start + v2m->nr_spis - 1));
 	return 0;
-
+err_free_bm:
+	kfree(v2m->bm);
 err_iounmap:
 	iounmap(v2m->base);
 err_free_v2m:
-- 
1.9.1