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Date: Sat, 18 May 2013 07:47:43 -0700
From: Jon Mason <jon.mason@...el.com>
To: Jonghwan Choi <jhbird.choi@...il.com>
Cc: stable@...r.kernel.org, linux-kernel@...r.kernel.org,
Jonghwan Choi <jhbird.choi@...sung.com>
Subject: Re: [PATCH 3.9-table] NTB: Handle 64bit BAR sizes
On Sat, May 18, 2013 at 11:41:56AM +0900, Jonghwan Choi wrote:
> From: Jon Mason <jon.mason@...el.com>
>
> This patch looks like it should be in the 3.9-stable tree, should we apply
> it?
Yes, thanks.
>
> ------------------
>
> From: "Jon Mason <jon.mason@...el.com>"
>
> commit 113fc505b83b2d16e820ca74fa07f99a34877b1d upstream
>
> 64bit BAR sizes are permissible with an NTB device. To support them
> various modifications and clean-ups were required, most significantly
> using 2 32bit scratch pad registers for each BAR.
>
> Also, modify the driver to allow more than 2 Memory Windows.
>
> Cc: <stable@...r.kernel.org> # 3.9.x: ad3e2751: ntb: off by one
> Cc: <stable@...r.kernel.org> # 3.9.x: cc0f868d: NTB: fix pointer math
> Signed-off-by: Jon Mason <jon.mason@...el.com>
> Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
> ---
> drivers/ntb/ntb_hw.c | 4 +-
> drivers/ntb/ntb_transport.c | 121 ++++++++++++++++++++++++++------------------
> 2 files changed, 75 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
> index 195cc51..2dacd19 100644
> --- a/drivers/ntb/ntb_hw.c
> +++ b/drivers/ntb/ntb_hw.c
> @@ -1027,8 +1027,8 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> ndev->mw[i].vbase =
> ioremap_wc(pci_resource_start(pdev, MW_TO_BAR(i)),
> ndev->mw[i].bar_sz);
> - dev_info(&pdev->dev, "MW %d size %d\n", i,
> - (u32) pci_resource_len(pdev, MW_TO_BAR(i)));
> + dev_info(&pdev->dev, "MW %d size %llu\n", i,
> + pci_resource_len(pdev, MW_TO_BAR(i)));
> if (!ndev->mw[i].vbase) {
> dev_warn(&pdev->dev, "Cannot remap BAR %d\n",
> MW_TO_BAR(i));
> diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
> index 676ee16..2258649 100644
> --- a/drivers/ntb/ntb_transport.c
> +++ b/drivers/ntb/ntb_transport.c
> @@ -58,7 +58,7 @@
> #include <linux/ntb.h>
> #include "ntb_hw.h"
>
> -#define NTB_TRANSPORT_VERSION 2
> +#define NTB_TRANSPORT_VERSION 3
>
> static unsigned int transport_mtu = 0x401E;
> module_param(transport_mtu, uint, 0644);
> @@ -173,10 +173,13 @@ struct ntb_payload_header {
>
> enum {
> VERSION = 0,
> - MW0_SZ,
> - MW1_SZ,
> - NUM_QPS,
> QP_LINKS,
> + NUM_QPS,
> + NUM_MWS,
> + MW0_SZ_HIGH,
> + MW0_SZ_LOW,
> + MW1_SZ_HIGH,
> + MW1_SZ_LOW,
> MAX_SPAD,
> };
>
> @@ -526,6 +529,18 @@ static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size)
> return 0;
> }
>
> +static void ntb_free_mw(struct ntb_transport *nt, int num_mw)
> +{
> + struct ntb_transport_mw *mw = &nt->mw[num_mw];
> + struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
> +
> + if (!mw->virt_addr)
> + return;
> +
> + dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr);
> + mw->virt_addr = NULL;
> +}
> +
> static void ntb_qp_link_cleanup(struct work_struct *work)
> {
> struct ntb_transport_qp *qp = container_of(work,
> @@ -604,25 +619,31 @@ static void ntb_transport_link_work(struct work_struct *work)
> u32 val;
> int rc, i;
>
> - /* send the local info */
> - rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION);
> - if (rc) {
> - dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
> - 0, VERSION);
> - goto out;
> - }
> + /* send the local info, in the opposite order of the way we read it */
> + for (i = 0; i < NTB_NUM_MW; i++) {
> + rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2),
> + ntb_get_mw_size(ndev, i) >> 32);
> + if (rc) {
> + dev_err(&pdev->dev, "Error writing %u to remote spad %d\n",
> + (u32)(ntb_get_mw_size(ndev, i) >> 32),
> + MW0_SZ_HIGH + (i * 2));
> + goto out;
> + }
>
> - rc = ntb_write_remote_spad(ndev, MW0_SZ, ntb_get_mw_size(ndev, 0));
> - if (rc) {
> - dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
> - (u32) ntb_get_mw_size(ndev, 0), MW0_SZ);
> - goto out;
> + rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2),
> + (u32) ntb_get_mw_size(ndev, i));
> + if (rc) {
> + dev_err(&pdev->dev, "Error writing %u to remote spad %d\n",
> + (u32) ntb_get_mw_size(ndev, i),
> + MW0_SZ_LOW + (i * 2));
> + goto out;
> + }
> }
>
> - rc = ntb_write_remote_spad(ndev, MW1_SZ, ntb_get_mw_size(ndev, 1));
> + rc = ntb_write_remote_spad(ndev, NUM_MWS, NTB_NUM_MW);
> if (rc) {
> dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
> - (u32) ntb_get_mw_size(ndev, 1), MW1_SZ);
> + NTB_NUM_MW, NUM_MWS);
> goto out;
> }
>
> @@ -633,16 +654,10 @@ static void ntb_transport_link_work(struct work_struct *work)
> goto out;
> }
>
> - rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val);
> - if (rc) {
> - dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS);
> - goto out;
> - }
> -
> - rc = ntb_write_remote_spad(ndev, QP_LINKS, val);
> + rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION);
> if (rc) {
> dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
> - val, QP_LINKS);
> + NTB_TRANSPORT_VERSION, VERSION);
> goto out;
> }
>
> @@ -667,33 +682,43 @@ static void ntb_transport_link_work(struct work_struct *work)
> goto out;
> dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val);
>
> - rc = ntb_read_remote_spad(ndev, MW0_SZ, &val);
> + rc = ntb_read_remote_spad(ndev, NUM_MWS, &val);
> if (rc) {
> - dev_err(&pdev->dev, "Error reading remote spad %d\n", MW0_SZ);
> + dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS);
> goto out;
> }
>
> - if (!val)
> + if (val != NTB_NUM_MW)
> goto out;
> - dev_dbg(&pdev->dev, "Remote MW0 size = %d\n", val);
> + dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val);
>
> - rc = ntb_set_mw(nt, 0, val);
> - if (rc)
> - goto out;
> + for (i = 0; i < NTB_NUM_MW; i++) {
> + u64 val64;
>
> - rc = ntb_read_remote_spad(ndev, MW1_SZ, &val);
> - if (rc) {
> - dev_err(&pdev->dev, "Error reading remote spad %d\n", MW1_SZ);
> - goto out;
> - }
> + rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val);
> + if (rc) {
> + dev_err(&pdev->dev, "Error reading remote spad %d\n",
> + MW0_SZ_HIGH + (i * 2));
> + goto out1;
> + }
>
> - if (!val)
> - goto out;
> - dev_dbg(&pdev->dev, "Remote MW1 size = %d\n", val);
> + val64 = (u64) val << 32;
>
> - rc = ntb_set_mw(nt, 1, val);
> - if (rc)
> - goto out;
> + rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val);
> + if (rc) {
> + dev_err(&pdev->dev, "Error reading remote spad %d\n",
> + MW0_SZ_LOW + (i * 2));
> + goto out1;
> + }
> +
> + val64 |= val;
> +
> + dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64);
> +
> + rc = ntb_set_mw(nt, i, val64);
> + if (rc)
> + goto out1;
> + }
>
> nt->transport_link = NTB_LINK_UP;
>
> @@ -708,6 +733,9 @@ static void ntb_transport_link_work(struct work_struct *work)
>
> return;
>
> +out1:
> + for (i = 0; i < NTB_NUM_MW; i++)
> + ntb_free_mw(nt, i);
> out:
> if (ntb_hw_link_status(ndev))
> schedule_delayed_work(&nt->link_work,
> @@ -897,10 +925,7 @@ void ntb_transport_free(void *transport)
> pdev = ntb_query_pdev(nt->ndev);
>
> for (i = 0; i < NTB_NUM_MW; i++)
> - if (nt->mw[i].virt_addr)
> - dma_free_coherent(&pdev->dev, nt->mw[i].size,
> - nt->mw[i].virt_addr,
> - nt->mw[i].dma_addr);
> + ntb_free_mw(nt, i);
>
> kfree(nt->qps);
> ntb_unregister_transport(nt->ndev);
> --
> 1.8.1.2
>
--
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