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Date: Wed, 17 May 2017 18:35:05 +0300
From: Sergei Temerkhanov <s.temerkhanov@...il.com>
To: Jan Glauber <jglauber@...ium.com>
Cc: Borislav Petkov <bp@...e.de>, linux-edac@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] edac: thunderx: Replace pci_alloc_msix_exact
CIL...
On Tue, May 16, 2017 at 12:54 PM, Jan Glauber <jglauber@...ium.com> wrote:
> Replace the deprecated pci_alloc_msix_exact() with
> pci_alloc_irq_vectors().
>
> Avoid the container_of usage in the interrupt handler
> by simply passing the required struct as data to the interrupt
> handler.
>
> Signed-off-by: Jan Glauber <jglauber@...ium.com>
> ---
> drivers/edac/thunderx_edac.c | 91 ++++++++++++++------------------------------
> 1 file changed, 28 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/edac/thunderx_edac.c b/drivers/edac/thunderx_edac.c
> index 86d585c..da12804 100644
> --- a/drivers/edac/thunderx_edac.c
> +++ b/drivers/edac/thunderx_edac.c
> @@ -183,7 +183,6 @@ struct lmc_err_ctx {
> struct thunderx_lmc {
> void __iomem *regs;
> struct pci_dev *pdev;
> - struct msix_entry msix_ent;
>
> atomic_t ecc_int;
>
> @@ -738,18 +737,17 @@ static int thunderx_lmc_probe(struct pci_dev *pdev,
> mci->scrub_mode = SCRUB_NONE;
>
> lmc->pdev = pdev;
> - lmc->msix_ent.entry = 0;
>
> lmc->ring_head = 0;
> lmc->ring_tail = 0;
>
> - ret = pci_enable_msix_exact(pdev, &lmc->msix_ent, 1);
> - if (ret) {
> + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
> + if (ret < 0) {
> dev_err(&pdev->dev, "Cannot enable interrupt: %d\n", ret);
> goto err_free;
> }
>
> - ret = devm_request_threaded_irq(&pdev->dev, lmc->msix_ent.vector,
> + ret = devm_request_threaded_irq(&pdev->dev, pci_irq_vector(pdev, 0),
> thunderx_lmc_err_isr,
> thunderx_lmc_threaded_isr, 0,
> "[EDAC] ThunderX LMC", mci);
> @@ -1079,7 +1077,6 @@ struct thunderx_ocx {
> struct edac_device_ctl_info *edac_dev;
>
> struct dentry *debugfs;
> - struct msix_entry msix_ent[OCX_INTS];
>
> struct ocx_com_err_ctx com_err_ctx[RING_ENTRIES];
> struct ocx_link_err_ctx link_err_ctx[RING_ENTRIES];
> @@ -1095,12 +1092,9 @@ struct thunderx_ocx {
> #define OCX_OTHER_SIZE (50 * ARRAY_SIZE(ocx_com_link_errors))
>
> /* This handler is threaded */
> -static irqreturn_t thunderx_ocx_com_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_ocx_com_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_ocx *ocx = container_of(msix, struct thunderx_ocx,
> - msix_ent[msix->entry]);
> -
> + struct thunderx_ocx *ocx = (struct thunderx_ocx *) dev_id;
> int lane;
> unsigned long head = ring_pos(ocx->com_ring_head,
> ARRAY_SIZE(ocx->com_err_ctx));
> @@ -1124,12 +1118,9 @@ static irqreturn_t thunderx_ocx_com_isr(int irq, void *irq_id)
> return IRQ_WAKE_THREAD;
> }
>
> -static irqreturn_t thunderx_ocx_com_threaded_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_ocx_com_threaded_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_ocx *ocx = container_of(msix, struct thunderx_ocx,
> - msix_ent[msix->entry]);
> -
> + struct thunderx_ocx *ocx = (struct thunderx_ocx *) dev_id;
> irqreturn_t ret = IRQ_NONE;
>
> unsigned long tail;
> @@ -1188,16 +1179,14 @@ static irqreturn_t thunderx_ocx_com_threaded_isr(int irq, void *irq_id)
> return ret;
> }
>
> -static irqreturn_t thunderx_ocx_lnk_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_ocx_lnk_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_ocx *ocx = container_of(msix, struct thunderx_ocx,
> - msix_ent[msix->entry]);
> + struct thunderx_ocx *ocx = (struct thunderx_ocx *) dev_id;
> unsigned long head = ring_pos(ocx->link_ring_head,
> ARRAY_SIZE(ocx->link_err_ctx));
> struct ocx_link_err_ctx *ctx = &ocx->link_err_ctx[head];
>
> - ctx->link = msix->entry;
> + ctx->link = irq - pci_irq_vector(ocx->pdev, 0);
This assumes MSIX vectors are allocated sequentially, as far as I can
tell. Is this behavior guaranteed?
As a precaution, a check for 0 <= ctx->link <= 2 might need to be added here.
> ctx->reg_com_link_int = readq(ocx->regs + OCX_COM_LINKX_INT(ctx->link));
>
> writeq(ctx->reg_com_link_int, ocx->regs + OCX_COM_LINKX_INT(ctx->link));
> @@ -1207,11 +1196,9 @@ static irqreturn_t thunderx_ocx_lnk_isr(int irq, void *irq_id)
> return IRQ_WAKE_THREAD;
> }
>
> -static irqreturn_t thunderx_ocx_lnk_threaded_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_ocx_lnk_threaded_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_ocx *ocx = container_of(msix, struct thunderx_ocx,
> - msix_ent[msix->entry]);
> + struct thunderx_ocx *ocx = (struct thunderx_ocx *) dev_id;
> irqreturn_t ret = IRQ_NONE;
> unsigned long tail;
> struct ocx_link_err_ctx *ctx;
> @@ -1410,20 +1397,15 @@ static int thunderx_ocx_probe(struct pci_dev *pdev,
>
> ocx->pdev = pdev;
>
> - for (i = 0; i < OCX_INTS; i++) {
> - ocx->msix_ent[i].entry = i;
> - ocx->msix_ent[i].vector = 0;
> - }
> -
> - ret = pci_enable_msix_exact(pdev, ocx->msix_ent, OCX_INTS);
> - if (ret) {
> + ret = pci_alloc_irq_vectors(pdev, 1, OCX_INTS, PCI_IRQ_MSIX);
> + if (ret < 0) {
> dev_err(&pdev->dev, "Cannot enable interrupt: %d\n", ret);
> goto err_free;
> }
What happens if less than OCX_INTS vectors are allocated?
>
> for (i = 0; i < OCX_INTS; i++) {
> ret = devm_request_threaded_irq(&pdev->dev,
> - ocx->msix_ent[i].vector,
> + pci_irq_vector(pdev, i),
> (i == 3) ?
> thunderx_ocx_com_isr :
> thunderx_ocx_lnk_isr,
> @@ -1431,7 +1413,7 @@ static int thunderx_ocx_probe(struct pci_dev *pdev,
> thunderx_ocx_com_threaded_isr :
> thunderx_ocx_lnk_threaded_isr,
> 0, "[EDAC] ThunderX OCX",
> - &ocx->msix_ent[i]);
> + ocx);
> if (ret)
> goto err_free;
> }
> @@ -1773,19 +1755,14 @@ struct thunderx_l2c {
>
> int index;
>
> - struct msix_entry msix_ent;
> -
> struct l2c_err_ctx err_ctx[RING_ENTRIES];
> unsigned long ring_head;
> unsigned long ring_tail;
> };
>
> -static irqreturn_t thunderx_l2c_tad_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_l2c_tad_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_l2c *tad = container_of(msix, struct thunderx_l2c,
> - msix_ent);
> -
> + struct thunderx_l2c *tad = (struct thunderx_l2c *) dev_id;
> unsigned long head = ring_pos(tad->ring_head, ARRAY_SIZE(tad->err_ctx));
> struct l2c_err_ctx *ctx = &tad->err_ctx[head];
>
> @@ -1812,12 +1789,9 @@ static irqreturn_t thunderx_l2c_tad_isr(int irq, void *irq_id)
> return IRQ_WAKE_THREAD;
> }
>
> -static irqreturn_t thunderx_l2c_cbc_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_l2c_cbc_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_l2c *cbc = container_of(msix, struct thunderx_l2c,
> - msix_ent);
> -
> + struct thunderx_l2c *cbc = (struct thunderx_l2c *) dev_id;
> unsigned long head = ring_pos(cbc->ring_head, ARRAY_SIZE(cbc->err_ctx));
> struct l2c_err_ctx *ctx = &cbc->err_ctx[head];
>
> @@ -1841,12 +1815,9 @@ static irqreturn_t thunderx_l2c_cbc_isr(int irq, void *irq_id)
> return IRQ_WAKE_THREAD;
> }
>
> -static irqreturn_t thunderx_l2c_mci_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_l2c_mci_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_l2c *mci = container_of(msix, struct thunderx_l2c,
> - msix_ent);
> -
> + struct thunderx_l2c *mci = (struct thunderx_l2c *) dev_id;
> unsigned long head = ring_pos(mci->ring_head, ARRAY_SIZE(mci->err_ctx));
> struct l2c_err_ctx *ctx = &mci->err_ctx[head];
>
> @@ -1862,12 +1833,9 @@ static irqreturn_t thunderx_l2c_mci_isr(int irq, void *irq_id)
> return IRQ_WAKE_THREAD;
> }
>
> -static irqreturn_t thunderx_l2c_threaded_isr(int irq, void *irq_id)
> +static irqreturn_t thunderx_l2c_threaded_isr(int irq, void *dev_id)
> {
> - struct msix_entry *msix = irq_id;
> - struct thunderx_l2c *l2c = container_of(msix, struct thunderx_l2c,
> - msix_ent);
> -
> + struct thunderx_l2c *l2c = (struct thunderx_l2c *) dev_id;
> unsigned long tail = ring_pos(l2c->ring_tail, ARRAY_SIZE(l2c->err_ctx));
> struct l2c_err_ctx *ctx = &l2c->err_ctx[tail];
> irqreturn_t ret = IRQ_NONE;
> @@ -2049,20 +2017,17 @@ static int thunderx_l2c_probe(struct pci_dev *pdev,
> l2c->ring_head = 0;
> l2c->ring_tail = 0;
>
> - l2c->msix_ent.entry = 0;
> - l2c->msix_ent.vector = 0;
> -
> - ret = pci_enable_msix_exact(pdev, &l2c->msix_ent, 1);
> - if (ret) {
> + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
> + if (ret < 0) {
> dev_err(&pdev->dev, "Cannot enable interrupt: %d\n", ret);
> goto err_free;
> }
>
> - ret = devm_request_threaded_irq(&pdev->dev, l2c->msix_ent.vector,
> + ret = devm_request_threaded_irq(&pdev->dev, pci_irq_vector(pdev, 0),
> thunderx_l2c_isr,
> thunderx_l2c_threaded_isr,
> 0, "[EDAC] ThunderX L2C",
> - &l2c->msix_ent);
> + l2c);
> if (ret)
> goto err_free;
>
> --
> 1.9.1
>
Regards,
Sergey
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