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Date: Tue, 1 Aug 2017 14:59:55 -0400
From: Jon Mason <jdmason@...zu.us>
To: Logan Gunthorpe <logang@...tatee.com>
Cc: linux-ntb@...glegroups.com, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, Dave Jiang <dave.jiang@...el.com>,
Allen Hubbe <Allen.Hubbe@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
Stephen Bates <sbates@...thlin.com>,
Serge Semin <fancer.lancer@...il.com>
Subject: Re: [PATCH v3 13/16] switchtec_ntb: implement doorbell registers
On Tue, Jul 25, 2017 at 02:57:50PM -0600, Logan Gunthorpe wrote:
> Pretty straightforward implementation of doorbell registers.
> The shift and mask were setup in an earlier patch and this just hooks
> up the appropriate portion of the IDB register as the local doorbells
> and the opposite portion of ODB as the peer doorbells. The DB mask is
> protected by a spinlock to avoid concurrent read-modify-write accesses.
>
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> Reviewed-by: Stephen Bates <sbates@...thlin.com>
> Reviewed-by: Kurt Schwemmer <kurt.schwemmer@...rosemi.com>
> ---
> drivers/ntb/hw/mscc/switchtec_ntb.c | 89 +++++++++++++++++++++++++++++++++++--
> 1 file changed, 85 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/ntb/hw/mscc/switchtec_ntb.c b/drivers/ntb/hw/mscc/switchtec_ntb.c
> index 34d69fa8612d..3037ca730998 100644
> --- a/drivers/ntb/hw/mscc/switchtec_ntb.c
> +++ b/drivers/ntb/hw/mscc/switchtec_ntb.c
> @@ -98,6 +98,9 @@ struct switchtec_ntb {
> int db_shift;
> int db_peer_shift;
>
> + /* synchronize rmw access of db_mask and hw reg */
> + spinlock_t db_mask_lock;
> +
> int nr_direct_mw;
> int nr_lut_mw;
> int direct_mw_to_bar[MAX_DIRECT_MW];
> @@ -338,41 +341,115 @@ static int switchtec_ntb_link_disable(struct ntb_dev *ntb)
>
> static u64 switchtec_ntb_db_valid_mask(struct ntb_dev *ntb)
> {
> - return 0;
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + return sndev->db_valid_mask;
> }
>
> static int switchtec_ntb_db_vector_count(struct ntb_dev *ntb)
> {
> - return 0;
> + return 1;
> }
>
> static u64 switchtec_ntb_db_vector_mask(struct ntb_dev *ntb, int db_vector)
> {
> - return 0;
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + if (db_vector < 0 || db_vector > 1)
> + return 0;
> +
> + return sndev->db_valid_mask;
> }
>
> static u64 switchtec_ntb_db_read(struct ntb_dev *ntb)
> {
> - return 0;
> + u64 ret;
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + ret = ioread64(&sndev->mmio_self_dbmsg->idb) >> sndev->db_shift;
> +
> + return ret & sndev->db_valid_mask;
> }
>
> static int switchtec_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits)
> {
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + iowrite64(db_bits << sndev->db_shift, &sndev->mmio_self_dbmsg->idb);
> +
> return 0;
> }
>
> static int switchtec_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
> {
> + unsigned long irqflags;
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + if (db_bits & ~sndev->db_valid_mask)
> + return -EINVAL;
> +
> + spin_lock_irqsave(&sndev->db_mask_lock, irqflags);
> + {
> + sndev->db_mask |= db_bits << sndev->db_shift;
> + iowrite64(~sndev->db_mask, &sndev->mmio_self_dbmsg->idb_mask);
> + }
unnecessary braces. Same for below
> + spin_unlock_irqrestore(&sndev->db_mask_lock, irqflags);
> +
> return 0;
> }
>
> static int switchtec_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
> {
> + unsigned long irqflags;
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + if (db_bits & ~sndev->db_valid_mask)
> + return -EINVAL;
> +
> + spin_lock_irqsave(&sndev->db_mask_lock, irqflags);
> + {
> + sndev->db_mask &= ~(db_bits << sndev->db_shift);
> + iowrite64(~sndev->db_mask, &sndev->mmio_self_dbmsg->idb_mask);
> + }
> + spin_unlock_irqrestore(&sndev->db_mask_lock, irqflags);
> +
> + return 0;
> +}
> +
> +static u64 switchtec_ntb_db_read_mask(struct ntb_dev *ntb)
> +{
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + return (sndev->db_mask >> sndev->db_shift) & sndev->db_valid_mask;
> +}
> +
> +static int switchtec_ntb_peer_db_addr(struct ntb_dev *ntb,
> + phys_addr_t *db_addr,
> + resource_size_t *db_size)
> +{
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> + unsigned long offset;
> +
> + offset = (unsigned long)sndev->mmio_self_dbmsg->odb -
> + (unsigned long)sndev->stdev->mmio;
> +
> + offset += sndev->db_shift / 8;
> +
> + if (db_addr)
> + *db_addr = pci_resource_start(ntb->pdev, 0) + offset;
> + if (db_size)
> + *db_size = sizeof(u32);
> +
> return 0;
> }
>
> static int switchtec_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
> {
> + struct switchtec_ntb *sndev = ntb_sndev(ntb);
> +
> + iowrite64(db_bits << sndev->db_peer_shift,
> + &sndev->mmio_self_dbmsg->odb);
> +
> return 0;
> }
>
> @@ -413,6 +490,8 @@ static const struct ntb_dev_ops switchtec_ntb_ops = {
> .db_clear = switchtec_ntb_db_clear,
> .db_set_mask = switchtec_ntb_db_set_mask,
> .db_clear_mask = switchtec_ntb_db_clear_mask,
> + .db_read_mask = switchtec_ntb_db_read_mask,
> + .peer_db_addr = switchtec_ntb_peer_db_addr,
> .peer_db_set = switchtec_ntb_peer_db_set,
> .spad_count = switchtec_ntb_spad_count,
> .spad_read = switchtec_ntb_spad_read,
> @@ -680,6 +759,8 @@ static irqreturn_t switchtec_ntb_doorbell_isr(int irq, void *dev)
>
> dev_dbg(&sndev->stdev->dev, "doorbell\n");
>
> + ntb_db_event(&sndev->ntb, 0);
> +
> return IRQ_HANDLED;
> }
>
> --
> 2.11.0
>
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