dmaengine: hisi_dma: fix MSI allocate fail when reload hisi_dma
Remove the loaded hisi_dma driver and reload it, the driver fails
to work properly. The following error is reported in the kernel log:
[ 1475.597609] hisi_dma 0000:7b:00.0: Failed to allocate MSI vectors!
[ 1475.604915] hisi_dma: probe of 0000:7b:00.0 failed with error -28
As noted in "The MSI Driver Guide HOWTO"[1], the number of MSI
interrupt must be a power of two. The Kunpeng DMA driver allocates 30
MSI interrupts. As a result, no space left on device is reported
when the driver is reloaded and allocates interrupt vectors from the
interrupt domain.
This patch changes the number of interrupt vectors allocated by
hisi_dma driver to 32 to avoid this problem.
[1] https://www.kernel.org/doc/html/latest/PCI/msi-howto.html
Fixes: e9f08b65250d ("dmaengine: hisilicon: Add Kunpeng DMA engine support")
Signed-off-by: Jie Hai <haijie1@huawei.com>
Acked-by: Zhou Wang <wangzhou1@hisilicon.com>
Link: https://lore.kernel.org/r/20220216072101.34473-1-haijie1@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
diff --git a/drivers/dma/hisi_dma.c b/drivers/dma/hisi_dma.c
index 97c87a7..43817ce 100644
--- a/drivers/dma/hisi_dma.c
+++ b/drivers/dma/hisi_dma.c
@@ -30,7 +30,7 @@
#define HISI_DMA_MODE 0x217c
#define HISI_DMA_OFFSET 0x100
-#define HISI_DMA_MSI_NUM 30
+#define HISI_DMA_MSI_NUM 32
#define HISI_DMA_CHAN_NUM 30
#define HISI_DMA_Q_DEPTH_VAL 1024
