From patchwork Fri May 12 16:56:10 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joao Pinto X-Patchwork-Id: 761740 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3wPbjQ2ygLz9s4q for ; Sat, 13 May 2017 02:56:42 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757284AbdELQ4f (ORCPT ); Fri, 12 May 2017 12:56:35 -0400 Received: from us01smtprelay-2.synopsys.com ([198.182.60.111]:59959 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757894AbdELQ4d (ORCPT ); Fri, 12 May 2017 12:56:33 -0400 Received: from mailhost.synopsys.com (mailhost1.synopsys.com [10.12.238.239]) by smtprelay.synopsys.com (Postfix) with ESMTP id 9305810C1427; Fri, 12 May 2017 09:56:29 -0700 (PDT) Received: from mailhost.synopsys.com (localhost [127.0.0.1]) by mailhost.synopsys.com (Postfix) with ESMTP id 62ED7C28; Fri, 12 May 2017 09:56:29 -0700 (PDT) Received: from jpinto-box.internal.synopsys.com (jpinto-box.internal.synopsys.com [10.107.19.150]) by mailhost.synopsys.com (Postfix) with ESMTP id C67A7BFB; Fri, 12 May 2017 09:56:25 -0700 (PDT) From: Joao Pinto To: bhelgaas@google.com, marc.zyngier@arm.com Cc: jingoohan1@gmail.com, m-karicheri2@ti.com, thomas.petazzoni@free-electrons.com, minghuan.Lian@freescale.com, mingkai.hu@freescale.com, tie-fei.zang@freescale.com, hongxing.zhu@nxp.com, l.stach@pengutronix.de, niklas.cassel@axis.com, jesper.nilsson@axis.com, wangzhou1@hisilicon.com, gabriele.paoloni@huawei.com, svarbanov@mm-sol.com, linux-pci@vger.kernel.org, Joao Pinto Subject: [RFC 1/8] pci: adding new irq api to pci-designware Date: Fri, 12 May 2017 17:56:10 +0100 Message-Id: X-Mailer: git-send-email 2.9.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This patch adds the new interrupt api to pecie-designware, keeping the old one. A define was added to toggle between the two apis (for testing purposes). Signed-off-by: Joao Pinto --- drivers/pci/dwc/pcie-designware-host.c | 241 ++++++++++++++++++++++++++++++++- drivers/pci/dwc/pcie-designware.h | 5 + 2 files changed, 244 insertions(+), 2 deletions(-) diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c index 28ed32b..6810ea10b 100644 --- a/drivers/pci/dwc/pcie-designware-host.c +++ b/drivers/pci/dwc/pcie-designware-host.c @@ -11,6 +11,7 @@ * published by the Free Software Foundation. */ +#include #include #include #include @@ -19,6 +20,9 @@ #include "pcie-designware.h" +/* Temporary: Activate to use new IRQ API */ +/*#define CONFIG_PCIEDW_NEW_IRQ_API*/ + static struct pci_ops dw_pcie_ops; static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size, @@ -45,6 +49,7 @@ static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size, return dw_pcie_write(pci->dbi_base + where, size, val); } +#ifndef CONFIG_PCIEDW_NEW_IRQ_API static struct irq_chip dw_msi_irq_chip = { .name = "PCI-MSI", .irq_enable = pci_msi_unmask_irq, @@ -52,6 +57,29 @@ static struct irq_chip dw_msi_irq_chip = { .irq_mask = pci_msi_mask_irq, .irq_unmask = pci_msi_unmask_irq, }; +#else +static void dw_msi_mask_irq(struct irq_data *d) { + pci_msi_mask_irq(d); + irq_chip_mask_parent(d); +} + +static void dw_msi_unmask_irq(struct irq_data *d) { + pci_msi_unmask_irq(d); + irq_chip_unmask_parent(d); +} + +static struct irq_chip dw_msi_irq_chip = { + .name = "PCI-MSI", + .irq_mask = dw_msi_mask_irq, + .irq_unmask = dw_msi_unmask_irq, +}; + +static struct msi_domain_info dw_pcie_msi_domain_info = { + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | + MSI_FLAG_PCI_MSIX), + .chip = &dw_msi_irq_chip, +}; +#endif /* MSI int handler */ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp) @@ -81,6 +109,190 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp) return ret; } +#ifdef CONFIG_PCIEDW_NEW_IRQ_API +/* Chained MSI interrupt service routine */ +static void dw_chained_msi_isr(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct pcie_port *pp; + struct dw_pcie *pci; + + chained_irq_enter(chip, desc); + pci = irq_desc_get_handler_data(desc); + pp = &pci->pp; + + dw_handle_msi_irq(pp); + + chained_irq_exit(chip, desc); +} + +static void dw_pci_setup_msi_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct dw_pcie *pci = irq_data_get_irq_chip_data(data); + struct pcie_port *pp = &pci->pp; + u64 msi_target; + + if (pp->ops->get_msi_addr) + msi_target = pp->ops->get_msi_addr(pp); + else + msi_target = virt_to_phys((void *)pp->msi_data); + + msg->address_lo = (u32)(msi_target & 0xffffffff); + msg->address_hi = (u32)(msi_target >> 32 & 0xffffffff); + + if (pp->ops->get_msi_data) + msg->data = pp->ops->get_msi_data(pp, data->hwirq); + else + msg->data = data->hwirq; + + dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n", + (int)data->hwirq, msg->address_hi, msg->address_lo); +} + +static int dw_pci_msi_set_affinity(struct irq_data *irq_data, + const struct cpumask *mask, bool force) +{ + return -EINVAL; +} + +static void dw_pci_bottom_mask(struct irq_data *data) +{ + struct dw_pcie *pci = irq_data_get_irq_chip_data(data); + struct pcie_port *pp = &pci->pp; + unsigned int res, bit, val; + + mutex_lock(&pp->lock); + + if (pp->ops->msi_clear_irq) + pp->ops->msi_clear_irq(pp, data->hwirq); + else { + res = (data->hwirq / 32) * 12; + bit = data->hwirq % 32; + + dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val); + val &= ~(1 << bit); + dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val); + } + + mutex_unlock(&pp->lock); +} + +static void dw_pci_bottom_unmask(struct irq_data *data) +{ + struct dw_pcie *pci = irq_data_get_irq_chip_data(data); + struct pcie_port *pp = &pci->pp; + unsigned int res, bit, val; + + mutex_lock(&pp->lock); + + if (pp->ops->msi_set_irq) + pp->ops->msi_set_irq(pp, data->hwirq); + else { + res = (data->hwirq / 32) * 12; + bit = data->hwirq % 32; + + dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val); + val |= 1 << bit; + dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val); + } + + mutex_unlock(&pp->lock); +} + +static struct irq_chip dw_pci_msi_bottom_irq_chip = { + .name = "DWPCI-MSI", + .irq_compose_msi_msg = dw_pci_setup_msi_msg, + .irq_set_affinity = dw_pci_msi_set_affinity, + .irq_mask = dw_pci_bottom_mask, + .irq_unmask = dw_pci_bottom_unmask, +}; + +static int dw_pcie_irq_domain_alloc(struct irq_domain *domain, + unsigned int virq, unsigned int nr_irqs, + void *args) +{ + struct dw_pcie *pci = domain->host_data; + struct pcie_port *pp = &pci->pp; + unsigned long bit; + + mutex_lock(&pp->lock); + + WARN_ON(nr_irqs != 1); + + bit = find_first_zero_bit(pp->msi_irq_in_use, pp->num_vectors); + if (bit >= pp->num_vectors) { + mutex_unlock(&pp->lock); + return -ENOSPC; + } + + set_bit(bit, pp->msi_irq_in_use); + + mutex_unlock(&pp->lock); + + irq_domain_set_info(domain, virq, bit, &dw_pci_msi_bottom_irq_chip, + domain->host_data, handle_simple_irq, + NULL, NULL); + + return 0; +} + +static void dw_pcie_irq_domain_free(struct irq_domain *domain, + unsigned int virq, unsigned int nr_irqs) +{ + struct irq_data *data = irq_domain_get_irq_data(domain, virq); + struct dw_pcie *pci = irq_data_get_irq_chip_data(data); + struct pcie_port *pp = &pci->pp; + + mutex_lock(&pp->lock); + + if (!test_bit(data->hwirq, pp->msi_irq_in_use)) + dev_err(pci->dev, "trying to free unused MSI#%lu\n", + data->hwirq); + else + __clear_bit(data->hwirq, pp->msi_irq_in_use); + + mutex_unlock(&pp->lock); +} + +static const struct irq_domain_ops dw_pcie_msi_domain_ops = { + .alloc = dw_pcie_irq_domain_alloc, + .free = dw_pcie_irq_domain_free, +}; + +int dw_pcie_allocate_domains(struct dw_pcie *pci) +{ + struct pcie_port *pp = &pci->pp; + struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node); + + pp->irq_domain = irq_domain_add_linear(NULL, pp->num_vectors, + &dw_pcie_msi_domain_ops, pci); + if (!pp->irq_domain) { + dev_err(pci->dev, "failed to create IRQ domain\n"); + return -ENOMEM; + } + + pp->msi_domain = pci_msi_create_irq_domain(fwnode, + &dw_pcie_msi_domain_info, + pp->irq_domain); + if (!pp->msi_domain) { + dev_err(pci->dev, "failed to create MSI domain\n"); + irq_domain_remove(pp->irq_domain); + return -ENOMEM; + } + + return 0; +} + +void dw_pcie_free_msi(struct pcie_port *pp) +{ + irq_set_chained_handler(pp->msi_irq, NULL); + irq_set_handler_data(pp->msi_irq, NULL); + + irq_domain_remove(pp->msi_domain); + irq_domain_remove(pp->irq_domain); +} +#endif + void dw_pcie_msi_init(struct pcie_port *pp) { u64 msi_target; @@ -279,11 +491,16 @@ int dw_pcie_host_init(struct pcie_port *pp) struct device *dev = pci->dev; struct device_node *np = dev->of_node; struct platform_device *pdev = to_platform_device(dev); + struct resource_entry *win, *tmp; struct pci_bus *bus, *child; struct resource *cfg_res; - int i, ret; +#ifndef CONFIG_PCIEDW_NEW_IRQ_API + int i; +#endif + int ret; LIST_HEAD(res); - struct resource_entry *win, *tmp; + + mutex_init(&pci->pp.lock); cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config"); if (cfg_res) { @@ -378,6 +595,12 @@ int dw_pcie_host_init(struct pcie_port *pp) if (IS_ENABLED(CONFIG_PCI_MSI)) { if (!pp->ops->msi_host_init) { + ret = of_property_read_u32(np, "num-vectors", + &pp->num_vectors); + if (ret) + pp->num_vectors = 1; + +#ifndef CONFIG_PCIEDW_NEW_IRQ_API pp->irq_domain = irq_domain_add_linear(dev->of_node, MAX_MSI_IRQS, &msi_domain_ops, &dw_pcie_msi_chip); @@ -389,6 +612,15 @@ int dw_pcie_host_init(struct pcie_port *pp) for (i = 0; i < MAX_MSI_IRQS; i++) irq_create_mapping(pp->irq_domain, i); +#else + ret = dw_pcie_allocate_domains(pci); + if (ret) + goto error; + + irq_set_chained_handler_and_data(pci->pp.msi_irq, + dw_chained_msi_isr, + pci); +#endif } else { ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip); if (ret < 0) @@ -400,6 +632,7 @@ int dw_pcie_host_init(struct pcie_port *pp) pp->ops->host_init(pp); pp->root_bus_nr = pp->busn->start; +#ifndef CONFIG_PCIEDW_NEW_IRQ_API if (IS_ENABLED(CONFIG_PCI_MSI)) { bus = pci_scan_root_bus_msi(dev, pp->root_bus_nr, &dw_pcie_ops, pp, &res, @@ -408,6 +641,10 @@ int dw_pcie_host_init(struct pcie_port *pp) } else bus = pci_scan_root_bus(dev, pp->root_bus_nr, &dw_pcie_ops, pp, &res); +#else + bus = pci_scan_root_bus(dev, pp->root_bus_nr, &dw_pcie_ops, + pp, &res); +#endif if (!bus) { ret = -ENOMEM; goto error; diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index c6a8405..15481a5 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -165,7 +165,10 @@ struct pcie_port { struct dw_pcie_host_ops *ops; int msi_irq; struct irq_domain *irq_domain; + struct irq_domain *msi_domain; unsigned long msi_data; + u32 num_vectors; + struct mutex lock; DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS); }; @@ -282,8 +285,10 @@ static inline u32 dw_pcie_readl_dbi2(struct dw_pcie *pci, u32 reg) #ifdef CONFIG_PCIE_DW_HOST irqreturn_t dw_handle_msi_irq(struct pcie_port *pp); void dw_pcie_msi_init(struct pcie_port *pp); +void dw_pcie_free_msi(struct pcie_port *pp); void dw_pcie_setup_rc(struct pcie_port *pp); int dw_pcie_host_init(struct pcie_port *pp); +int dw_pcie_allocate_domains(struct dw_pcie *pci); #else static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp) {