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Date: Wed, 9 Oct 2013 09:16:27 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Jingoo Han <jg1.han@...sung.com>
Cc: Kishon Vijay Abraham I <kishon@...com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
linux-samsung-soc@...r.kernel.org,
Kukjin Kim <kgene.kim@...sung.com>,
Pratyush Anand <pratyush.anand@...com>,
Mohit KUMAR <Mohit.KUMAR@...com>,
Siva Reddy Kallam <siva.kallam@...sung.com>,
SRIKANTH TUMKUR SHIVANAND <ts.srikanth@...sung.com>,
Arnd Bergmann <arnd@...db.de>, Sean Cross <xobs@...agi.com>,
Thierry Reding <thierry.reding@...il.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH V2] PCI: designware: Add irq_create_mapping()
On Wed, Oct 9, 2013 at 6:32 AM, Jingoo Han <jg1.han@...sung.com> wrote:
> From: Pratyush Anand <pratyush.anand@...com>
>
> Without irq_create_mapping(), the correct irq number cannot be
> provided. In this case, it makes problems such as NULL deference.
> Thus, irq_create_mapping() should be added for MSI.
>
> Signed-off-by: Pratyush Anand <pratyush.anand@...com>
> Suggested-by: Kishon Vijay Abraham I <kishon@...com>
> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
Applied to my pci/host-exynos branch for v3.13, thanks!
Bjorn
> ---
> Tested on Exynos5440.
>
> drivers/pci/host/pcie-designware.c | 25 +++++++++++++------------
> drivers/pci/host/pcie-designware.h | 2 +-
> 2 files changed, 14 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 8963017..92d58fd 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -157,7 +157,7 @@ static struct irq_chip dw_msi_irq_chip = {
> void dw_handle_msi_irq(struct pcie_port *pp)
> {
> unsigned long val;
> - int i, pos;
> + int i, pos, irq;
>
> for (i = 0; i < MAX_MSI_CTRLS; i++) {
> dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
> @@ -165,8 +165,9 @@ void dw_handle_msi_irq(struct pcie_port *pp)
> if (val) {
> pos = 0;
> while ((pos = find_next_bit(&val, 32, pos)) != 32) {
> - generic_handle_irq(pp->msi_irq_start
> - + (i * 32) + pos);
> + irq = irq_find_mapping(pp->irq_domain,
> + i * 32 + pos);
> + generic_handle_irq(irq);
> pos++;
> }
> }
> @@ -237,9 +238,8 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
> }
> }
>
> - irq = (pp->msi_irq_start + pos0);
> -
> - if ((irq + no_irqs) > (pp->msi_irq_start + MAX_MSI_IRQS-1))
> + irq = irq_find_mapping(pp->irq_domain, pos0);
> + if (!irq)
> goto no_valid_irq;
>
> i = 0;
> @@ -270,6 +270,7 @@ static void clear_irq(unsigned int irq)
> struct irq_desc *desc;
> struct msi_desc *msi;
> struct pcie_port *pp;
> + struct irq_data *data = irq_get_irq_data(irq);
>
> /* get the port structure */
> desc = irq_to_desc(irq);
> @@ -280,7 +281,7 @@ static void clear_irq(unsigned int irq)
> return;
> }
>
> - pos = irq - pp->msi_irq_start;
> + pos = data->hwirq;
>
> irq_free_desc(irq);
>
> @@ -371,8 +372,7 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> struct of_pci_range range;
> struct of_pci_range_parser parser;
> u32 val;
> -
> - struct irq_domain *irq_domain;
> + int i;
>
> if (of_pci_range_parser_init(&parser, np)) {
> dev_err(pp->dev, "missing ranges property\n");
> @@ -441,15 +441,16 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> }
>
> if (IS_ENABLED(CONFIG_PCI_MSI)) {
> - irq_domain = irq_domain_add_linear(pp->dev->of_node,
> + pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
> MAX_MSI_IRQS, &msi_domain_ops,
> &dw_pcie_msi_chip);
> - if (!irq_domain) {
> + if (!pp->irq_domain) {
> dev_err(pp->dev, "irq domain init failed\n");
> return -ENXIO;
> }
>
> - pp->msi_irq_start = irq_find_mapping(irq_domain, 0);
> + for (i = 0; i < MAX_MSI_IRQS; i++)
> + irq_create_mapping(pp->irq_domain, i);
> }
>
> if (pp->ops->host_init)
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index faccbbf..1bf9fc5 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -47,7 +47,7 @@ struct pcie_port {
> u32 lanes;
> struct pcie_host_ops *ops;
> int msi_irq;
> - int msi_irq_start;
> + struct irq_domain *irq_domain;
> unsigned long msi_data;
> DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
> };
> --
> 1.7.10.4
>
>
--
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