From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2780C432C3 for ; Wed, 27 Nov 2019 21:22:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 94EEC217AB for ; Wed, 27 Nov 2019 21:22:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZSUo9W+M" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730463AbfK0VV6 (ORCPT ); Wed, 27 Nov 2019 16:21:58 -0500 Received: from mail-oi1-f196.google.com ([209.85.167.196]:38893 "EHLO mail-oi1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727460AbfK0VV5 (ORCPT ); Wed, 27 Nov 2019 16:21:57 -0500 Received: by mail-oi1-f196.google.com with SMTP id a14so21419374oid.5; Wed, 27 Nov 2019 13:21:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RuaLmNrXRtPFe1+rU8S6i/zXCZtidFk5ellzx8/Qe7E=; b=ZSUo9W+MsFR1NoMihueh6QTXZHlWqHwj9m0B9DUpwDEI29XHPqJy1/BJsvWrRUGB44 WW/xMhDAhPa2rVDRlzTfDcxdlVv/3ETPQYMduksh9wtpq6anAiMigOyib7z9RxMXO3UZ ddYqC1/WC9a6d0sioWeW4vcpeb99dOTYQHYuuvvRmqW7vwZZsUsDnNykzmLdknU0QW5V Fqc5GuXgbdUOAaPPJ6u8S6kRQA/+ZPp/1SjAXNGDZl5SIIkFYvroR2JkflPrY+2pwICd LM2SCqaz3EA9gsRVdLkMyd9wFi32Qex6sz0GrYk2a/hM8A2lPGukure+XO7tbXK1k8QR LZSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=RuaLmNrXRtPFe1+rU8S6i/zXCZtidFk5ellzx8/Qe7E=; b=R44mroNyWef1o1ZORhtLkO+cnkgg1bE/593cQjl0hv6/j2CEN4h1tF17z7eriDZ9Ri 5J01ifS/ZlGZEnJw4r+khKZxWasYBW2oJBqAksdE1VMwRvnnUmNZqxUkty4XU5X9wpOW 5CBvZCsgmKQI3fBj26Hg5vZ787f2X1XwrS+op/X8wbus5Q7gqXQ+9Sz6IvFHaFvUzaGT FM9MdVfyU3ImDmvt9AFYgyD0z6SVPEqUD2GN4Dfn067nmt2eGw+8kfSX43tjHEcDIcX+ HDCG81JzY3YX4XZXHxv0l4wG2WC7RKh/ws8aYp/nJB96rfpnxDIKvoOPCvtP2nivcd2v A8Qg== X-Gm-Message-State: APjAAAVM1z+QXi61QjOWHMnG7s3uPcm4jRUaTsfmkb8p79D6Upe7WS4h Ctud+1aq/7d4DnpXQuvD/p9w79WLCHg92eu4GHM= X-Google-Smtp-Source: APXvYqwA+Ijhhl4jSq55zmifbAZlEi+Be8G91X/cHNO9hO1Mnwv2Ua9O6KRubES0HfXJmP/snbFKhJ2UMYSMqhwQg6Q= X-Received: by 2002:a05:6808:3cf:: with SMTP id o15mr5884220oie.7.1574889715961; Wed, 27 Nov 2019 13:21:55 -0800 (PST) MIME-Version: 1.0 References: <20191106193609.19645-1-prabhakar.mahadev-lad.rj@bp.renesas.com> <20191106193609.19645-3-prabhakar.mahadev-lad.rj@bp.renesas.com> <8564ee76-1da6-9b7c-01f2-7cda0cd3b3dc@ti.com> In-Reply-To: <8564ee76-1da6-9b7c-01f2-7cda0cd3b3dc@ti.com> From: "Lad, Prabhakar" Date: Wed, 27 Nov 2019 21:21:29 +0000 Message-ID: Subject: Re: [PATCH 2/5] pci: endpoint: add support to handle multiple base for mapping outbound memory To: Kishon Vijay Abraham I Cc: Bjorn Helgaas , Rob Herring , Mark Rutland , Geert Uytterhoeven , Magnus Damm , Marek Vasut , Yoshihiro Shimoda , linux-pci , Catalin Marinas , Will Deacon , Lorenzo Pieralisi , Arnd Bergmann , Greg Kroah-Hartman , Andrew Murray , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , LKML , LAK , Linux-Renesas , Chris Paterson , "Lad, Prabhakar" , linux-rockchip@lists.infradead.org, Shawn Lin , Heiko Stuebner , Tom Joseph , Jingoo Han , Gustavo Pimentel Content-Type: text/plain; charset="UTF-8" Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Hi Kishon, Thank you for the review. On Wed, Nov 27, 2019 at 5:15 AM Kishon Vijay Abraham I wrote: > > Hi Prabhakar, > > On 07/11/19 1:06 AM, Lad Prabhakar wrote: > > From: "Lad, Prabhakar" > > > > rcar pcie controller has support to map multiple memory regions > > for mapping the outbound memory in local system, this feature > > inspires to add support for handling multiple memory bases in > > endpoint framework. In case of multiple memory regions only chunk > > or complete region can be mapped and this window needs to be > > passed to the controller driver. > > > > Signed-off-by: Lad, Prabhakar > > Cc: > > Cc: Shawn Lin > > Cc: Heiko Stuebner > > Cc: Tom Joseph > > Cc: Jingoo Han > > Cc: Gustavo Pimentel > > --- > > .../pci/controller/dwc/pcie-designware-ep.c | 30 ++- > > drivers/pci/controller/pcie-cadence-ep.c | 11 +- > > drivers/pci/controller/pcie-rockchip-ep.c | 13 +- > > drivers/pci/endpoint/functions/pci-epf-test.c | 29 +-- > > drivers/pci/endpoint/pci-epc-core.c | 7 +- > > drivers/pci/endpoint/pci-epc-mem.c | 189 ++++++++++++++---- > > include/linux/pci-epc.h | 43 ++-- > > 7 files changed, 234 insertions(+), 88 deletions(-) > > > > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c > > index 3dd2e2697294..8d23c20b9afd 100644 > > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c > > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c > > @@ -195,7 +195,7 @@ static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no, > > } > > > > static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no, > > - phys_addr_t addr, > > + phys_addr_t addr, int window, > > u64 pci_addr, size_t size) > > { > > int ret; > > @@ -367,6 +367,7 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no, > > unsigned int aligned_offset; > > u16 msg_ctrl, msg_data; > > u32 msg_addr_lower, msg_addr_upper, reg; > > + int window = PCI_EPC_DEFAULT_WINDOW; > > u64 msg_addr; > > bool has_upper; > > int ret; > > @@ -390,11 +391,11 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no, > > reg = ep->msi_cap + PCI_MSI_DATA_32; > > msg_data = dw_pcie_readw_dbi(pci, reg); > > } > > - aligned_offset = msg_addr_lower & (epc->mem->page_size - 1); > > + aligned_offset = msg_addr_lower & (epc->mem[window]->page_size - 1); > > msg_addr = ((u64)msg_addr_upper) << 32 | > > (msg_addr_lower & ~aligned_offset); > > - ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr, > > - epc->mem->page_size); > > + ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, window, > > + msg_addr, epc->mem[window]->page_size); > > if (ret) > > return ret; > > > > @@ -416,6 +417,7 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no, > > u32 reg, msg_data, vec_ctrl; > > u64 tbl_addr, msg_addr, reg_u64; > > void __iomem *msix_tbl; > > + int window = PCI_EPC_DEFAULT_WINDOW; > > int ret; > > > > reg = ep->msix_cap + PCI_MSIX_TABLE; > > @@ -452,8 +454,8 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no, > > return -EPERM; > > } > > > > - ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr, > > - epc->mem->page_size); > > + ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, window, > > + msg_addr, epc->mem[window]->page_size); > > if (ret) > > return ret; > > > > @@ -466,10 +468,11 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no, > > > > void dw_pcie_ep_exit(struct dw_pcie_ep *ep) > > { > > + int window = PCI_EPC_DEFAULT_WINDOW; > > struct pci_epc *epc = ep->epc; > > > > pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem, > > - epc->mem->page_size); > > + epc->mem[window]->page_size); > > > > pci_epc_mem_exit(epc); > > } > > @@ -499,9 +502,12 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) > > u32 reg; > > void *addr; > > u8 hdr_type; > > + int window; > > unsigned int nbars; > > unsigned int offset; > > struct pci_epc *epc; > > + size_t msi_page_size; > > + struct pci_epc_mem_window mem_window; > > struct dw_pcie *pci = to_dw_pcie_from_ep(ep); > > struct device *dev = pci->dev; > > struct device_node *np = dev->of_node; > > @@ -574,15 +580,17 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) > > if (ret < 0) > > epc->max_functions = 1; > > > > - ret = __pci_epc_mem_init(epc, ep->phys_base, ep->addr_size, > > - ep->page_size); > > + mem_window.phys_base = ep->phys_base; > > + mem_window.size = ep->addr_size; > > + ret = __pci_epc_mem_init(epc, &mem_window, 1, ep->page_size); > > if (ret < 0) { > > dev_err(dev, "Failed to initialize address space\n"); > > return ret; > > } > > > > - ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys, > > - epc->mem->page_size); > > + msi_page_size = epc->mem[PCI_EPC_DEFAULT_WINDOW]->page_size; > > + ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys, &window, > > + msi_page_size); > > if (!ep->msi_mem) { > > dev_err(dev, "Failed to reserve memory for MSI/MSI-X\n"); > > return -ENOMEM; > > diff --git a/drivers/pci/controller/pcie-cadence-ep.c b/drivers/pci/controller/pcie-cadence-ep.c > > index def7820cb824..7991b38a5350 100644 > > --- a/drivers/pci/controller/pcie-cadence-ep.c > > +++ b/drivers/pci/controller/pcie-cadence-ep.c > > @@ -172,7 +172,7 @@ static void cdns_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn, > > } > > > > static int cdns_pcie_ep_map_addr(struct pci_epc *epc, u8 fn, phys_addr_t addr, > > - u64 pci_addr, size_t size) > > + int window, u64 pci_addr, size_t size) > > { > > struct cdns_pcie_ep *ep = epc_get_drvdata(epc); > > struct cdns_pcie *pcie = &ep->pcie; > > @@ -434,12 +434,14 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev) > > { > > struct device *dev = &pdev->dev; > > struct device_node *np = dev->of_node; > > + struct pci_epc_mem_window mem_window; > > struct cdns_pcie_ep *ep; > > struct cdns_pcie *pcie; > > struct pci_epc *epc; > > struct resource *res; > > int ret; > > int phy_count; > > + int window; > > > > ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL); > > if (!ep) > > @@ -502,15 +504,16 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev) > > if (of_property_read_u8(np, "max-functions", &epc->max_functions) < 0) > > epc->max_functions = 1; > > > > - ret = pci_epc_mem_init(epc, pcie->mem_res->start, > > - resource_size(pcie->mem_res)); > > + mem_window.phys_base = pcie->mem_res->start; > > + mem_window.size = resource_size(pcie->mem_res); > > + ret = pci_epc_mem_init(epc, &mem_window, 1); > > if (ret < 0) { > > dev_err(dev, "failed to initialize the memory space\n"); > > goto err_init; > > } > > > > ep->irq_cpu_addr = pci_epc_mem_alloc_addr(epc, &ep->irq_phys_addr, > > - SZ_128K); > > + &window, SZ_128K); > > if (!ep->irq_cpu_addr) { > > dev_err(dev, "failed to reserve memory space for MSI\n"); > > ret = -ENOMEM; > > diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c > > index d743b0a48988..d59e85c8d319 100644 > > --- a/drivers/pci/controller/pcie-rockchip-ep.c > > +++ b/drivers/pci/controller/pcie-rockchip-ep.c > > @@ -256,8 +256,8 @@ static void rockchip_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn, > > } > > > > static int rockchip_pcie_ep_map_addr(struct pci_epc *epc, u8 fn, > > - phys_addr_t addr, u64 pci_addr, > > - size_t size) > > + phys_addr_t addr, int window, > > + u64 pci_addr, size_t size) > > { > > struct rockchip_pcie_ep *ep = epc_get_drvdata(epc); > > struct rockchip_pcie *pcie = &ep->rockchip; > > @@ -562,11 +562,13 @@ static const struct of_device_id rockchip_pcie_ep_of_match[] = { > > > > static int rockchip_pcie_ep_probe(struct platform_device *pdev) > > { > > + struct pci_epc_mem_window mem_window; > > struct device *dev = &pdev->dev; > > struct rockchip_pcie_ep *ep; > > struct rockchip_pcie *rockchip; > > struct pci_epc *epc; > > size_t max_regions; > > + int window; > > int err; > > > > ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL); > > @@ -614,15 +616,16 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev) > > /* Only enable function 0 by default */ > > rockchip_pcie_write(rockchip, BIT(0), PCIE_CORE_PHY_FUNC_CFG); > > > > - err = pci_epc_mem_init(epc, rockchip->mem_res->start, > > - resource_size(rockchip->mem_res)); > > + mem_window.phys_base = rockchip->mem_res->start; > > + mem_window.size = resource_size(rockchip->mem_res); > > + err = pci_epc_mem_init(epc, &mem_window, 1); > > if (err < 0) { > > dev_err(dev, "failed to initialize the memory space\n"); > > goto err_uninit_port; > > } > > > > ep->irq_cpu_addr = pci_epc_mem_alloc_addr(epc, &ep->irq_phys_addr, > > - SZ_128K); > > + &window, SZ_128K); > > if (!ep->irq_cpu_addr) { > > dev_err(dev, "failed to reserve memory space for MSI\n"); > > err = -ENOMEM; > > diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c > > index 5d74f81ddfe4..475228011703 100644 > > --- a/drivers/pci/endpoint/functions/pci-epf-test.c > > +++ b/drivers/pci/endpoint/functions/pci-epf-test.c > > @@ -84,8 +84,10 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test) > > struct pci_epc *epc = epf->epc; > > enum pci_barno test_reg_bar = epf_test->test_reg_bar; > > struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar]; > > + int window; > > > > - src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size); > > + src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, > > + &window, reg->size); > > if (!src_addr) { > > dev_err(dev, "Failed to allocate source address\n"); > > reg->status = STATUS_SRC_ADDR_INVALID; > > @@ -93,15 +95,16 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test) > > goto err; > > } > > > > - ret = pci_epc_map_addr(epc, epf->func_no, src_phys_addr, reg->src_addr, > > - reg->size); > > + ret = pci_epc_map_addr(epc, epf->func_no, src_phys_addr, window, > > + reg->src_addr, reg->size); > > if (ret) { > > dev_err(dev, "Failed to map source address\n"); > > reg->status = STATUS_SRC_ADDR_INVALID; > > goto err_src_addr; > > } > > > > - dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, reg->size); > > + dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, > > + &window, reg->size); > > if (!dst_addr) { > > dev_err(dev, "Failed to allocate destination address\n"); > > reg->status = STATUS_DST_ADDR_INVALID; > > @@ -109,8 +112,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test) > > goto err_src_map_addr; > > } > > > > - ret = pci_epc_map_addr(epc, epf->func_no, dst_phys_addr, reg->dst_addr, > > - reg->size); > > + ret = pci_epc_map_addr(epc, epf->func_no, dst_phys_addr, window, > > + reg->dst_addr, reg->size); > > if (ret) { > > dev_err(dev, "Failed to map destination address\n"); > > reg->status = STATUS_DST_ADDR_INVALID; > > @@ -146,8 +149,9 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test) > > struct pci_epc *epc = epf->epc; > > enum pci_barno test_reg_bar = epf_test->test_reg_bar; > > struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar]; > > + int window; > > > > - src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size); > > + src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, &window, reg->size); > > if (!src_addr) { > > dev_err(dev, "Failed to allocate address\n"); > > reg->status = STATUS_SRC_ADDR_INVALID; > > @@ -155,8 +159,8 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test) > > goto err; > > } > > > > - ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, reg->src_addr, > > - reg->size); > > + ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, window, > > + reg->src_addr, reg->size); > > if (ret) { > > dev_err(dev, "Failed to map address\n"); > > reg->status = STATUS_SRC_ADDR_INVALID; > > @@ -193,13 +197,14 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test) > > void __iomem *dst_addr; > > void *buf; > > phys_addr_t phys_addr; > > + int window; > > struct pci_epf *epf = epf_test->epf; > > struct device *dev = &epf->dev; > > struct pci_epc *epc = epf->epc; > > enum pci_barno test_reg_bar = epf_test->test_reg_bar; > > struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar]; > > > > - dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size); > > + dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, &window, reg->size); > > if (!dst_addr) { > > dev_err(dev, "Failed to allocate address\n"); > > reg->status = STATUS_DST_ADDR_INVALID; > > @@ -207,8 +212,8 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test) > > goto err; > > } > > > > - ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, reg->dst_addr, > > - reg->size); > > + ret = pci_epc_map_addr(epc, epf->func_no, phys_addr, window, > > + reg->dst_addr, reg->size); > > if (ret) { > > dev_err(dev, "Failed to map address\n"); > > reg->status = STATUS_DST_ADDR_INVALID; > > diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c > > index 2091508c1620..289c266c2d90 100644 > > --- a/drivers/pci/endpoint/pci-epc-core.c > > +++ b/drivers/pci/endpoint/pci-epc-core.c > > @@ -358,13 +358,15 @@ EXPORT_SYMBOL_GPL(pci_epc_unmap_addr); > > * @epc: the EPC device on which address is allocated > > * @func_no: the endpoint function number in the EPC device > > * @phys_addr: physical address of the local system > > + * @window: index to the window region where PCI address will be mapped > > * @pci_addr: PCI address to which the physical address should be mapped > > * @size: the size of the allocation > > * > > * Invoke to map CPU address with PCI address. > > */ > > int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, > > - phys_addr_t phys_addr, u64 pci_addr, size_t size) > > + phys_addr_t phys_addr, int window, > > + u64 pci_addr, size_t size) > > { > > int ret; > > unsigned long flags; > > @@ -376,7 +378,8 @@ int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, > > return 0; > > > > spin_lock_irqsave(&epc->lock, flags); > > - ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size); > > + ret = epc->ops->map_addr(epc, func_no, phys_addr, > > + window, pci_addr, size); > > spin_unlock_irqrestore(&epc->lock, flags); > > > > return ret; > > diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c > > index d2b174ce15de..c955f2c97944 100644 > > --- a/drivers/pci/endpoint/pci-epc-mem.c > > +++ b/drivers/pci/endpoint/pci-epc-mem.c > > @@ -39,56 +39,77 @@ static int pci_epc_mem_get_order(struct pci_epc_mem *mem, size_t size) > > * __pci_epc_mem_init() - initialize the pci_epc_mem structure > > * @epc: the EPC device that invoked pci_epc_mem_init > > * @phys_base: the physical address of the base > > - * @size: the size of the address space > > + * @num_windows: number of windows device supports > > struct pci_epc_mem_window is missing here. oops my bad will fix that. > > * @page_size: size of each page > > * > > * Invoke to initialize the pci_epc_mem structure used by the > > * endpoint functions to allocate mapped PCI address. > > */ > > -int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_base, size_t size, > > - size_t page_size) > > +int __pci_epc_mem_init(struct pci_epc *epc, struct pci_epc_mem_window *windows, > > + int num_windows, size_t page_size) > > { > > - int ret; > > - struct pci_epc_mem *mem; > > - unsigned long *bitmap; > > + struct pci_epc_mem *mem = NULL; > > + unsigned long *bitmap = NULL; > > unsigned int page_shift; > > - int pages; > > int bitmap_size; > > + int pages; > > + int ret; > > + int i; > > + > > + epc->mem_windows = 0; > > + > > + if (!windows) > > + return -EINVAL; > > + > > + if (num_windows <= 0) > > + return -EINVAL; > > > > if (page_size < PAGE_SIZE) > > page_size = PAGE_SIZE; > > > > page_shift = ilog2(page_size); > > - pages = size >> page_shift; > > - bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); > > > > - mem = kzalloc(sizeof(*mem), GFP_KERNEL); > > - if (!mem) { > > - ret = -ENOMEM; > > - goto err; > > - } > > + epc->mem = kcalloc(num_windows, sizeof(*mem), GFP_KERNEL); > > + if (!epc->mem) > > + return -EINVAL; > > > > - bitmap = kzalloc(bitmap_size, GFP_KERNEL); > > - if (!bitmap) { > > - ret = -ENOMEM; > > - goto err_mem; > > - } > > + for (i = 0; i < num_windows; i++) { > > + pages = windows[i].phys_base >> page_shift; > > + bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); > > > > - mem->bitmap = bitmap; > > - mem->phys_base = phys_base; > > - mem->page_size = page_size; > > - mem->pages = pages; > > - mem->size = size; > > + mem = kzalloc(sizeof(*mem), GFP_KERNEL); > > + if (!mem) { > > + ret = -ENOMEM; > > + goto err_mem; > > + } > > > > - epc->mem = mem; > > + bitmap = kzalloc(bitmap_size, GFP_KERNEL); > > + if (!bitmap) { > > + ret = -ENOMEM; > > + goto err_mem; > > + } > > + > > + mem->bitmap = bitmap; > > + mem->window.phys_base = windows[i].phys_base; > > + mem->page_size = page_size; > > + mem->pages = pages; > > + mem->window.size = windows[i].size; > > + mem->window.map_size = 0; > > + > > + epc->mem[i] = mem; > > + } > > + epc->mem_windows = num_windows; > > > > return 0; > > > > err_mem: > > - kfree(mem); > > + for (; i >= 0; i--) { > > + kfree(mem->bitmap); > > + kfree(epc->mem[i]); > > + } > > + kfree(epc->mem); > > > > -err: > > -return ret; > > + return ret; > > } > > EXPORT_SYMBOL_GPL(__pci_epc_mem_init); > > > > @@ -101,48 +122,126 @@ EXPORT_SYMBOL_GPL(__pci_epc_mem_init); > > */ > > void pci_epc_mem_exit(struct pci_epc *epc) > > { > > - struct pci_epc_mem *mem = epc->mem; > > + struct pci_epc_mem *mem; > > + int i; > > + > > + if (!epc->mem_windows) > > + return; > > + > > + for (i = 0; i <= epc->mem_windows; i--) { > > + mem = epc->mem[i]; > > + kfree(mem->bitmap); > > + kfree(epc->mem[i]); > > + } > > + kfree(epc->mem); > > > > epc->mem = NULL; > > - kfree(mem->bitmap); > > - kfree(mem); > > + epc->mem_windows = 0; > > } > > EXPORT_SYMBOL_GPL(pci_epc_mem_exit); > > > > +static int pci_epc_find_best_fit_window(struct pci_epc *epc, size_t size) > > +{ > > + size_t window_least_size = 0; > > + int best_fit_window = -1; > > + struct pci_epc_mem *mem; > > + size_t actual_size; > > + int i; > > + > > + for (i = 0; i < epc->mem_windows; i++) { > > + mem = epc->mem[i]; > > + > > + /* if chunk from this region is already used skip it */ > > + if (mem->window.map_size) > > + continue; > > + > > + actual_size = ALIGN(size, mem->page_size); > > + > > + if (best_fit_window == -1) { > > + best_fit_window = i; > > + window_least_size = mem->window.size; > > + } else { > > + if (actual_size <= mem->window.size && > > + mem->window.size < window_least_size) { > > + best_fit_window = i; > > + window_least_size = mem->window.size; > > + } > > + } > > + } > > + > > + return best_fit_window; > > +} > > + > > /** > > * pci_epc_mem_alloc_addr() - allocate memory address from EPC addr space > > * @epc: the EPC device on which memory has to be allocated > > * @phys_addr: populate the allocated physical address here > > + * @window: populate the window here which will be used to map PCI address > > * @size: the size of the address space that has to be allocated > > * > > * Invoke to allocate memory address from the EPC address space. This > > * is usually done to map the remote RC address into the local system. > > */ > > void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, > > - phys_addr_t *phys_addr, size_t size) > > + phys_addr_t *phys_addr, > > + int *window, size_t size) > > { > > + int best_fit = PCI_EPC_DEFAULT_WINDOW; > > + void __iomem *virt_addr = NULL; > > + struct pci_epc_mem *mem; > > + unsigned int page_shift; > > int pageno; > > - void __iomem *virt_addr; > > - struct pci_epc_mem *mem = epc->mem; > > - unsigned int page_shift = ilog2(mem->page_size); > > int order; > > > > + if (epc->mem_windows <= 0) > > + return NULL; > > + > > + if (epc->mem_windows > 1) { > > + best_fit = pci_epc_find_best_fit_window(epc, size); > > + if (best_fit < 0) > > + return NULL; > > + } > > + > > + mem = epc->mem[best_fit]; > > size = ALIGN(size, mem->page_size); > > + if (size > (mem->window.size - mem->window.map_size)) > > + return NULL; > > Assume I have two mem regions, first region is of size 128MB and the second > region is of size 4GB. If there is a allocation request for 4GB, will the > allocation succeed? > yes it would succeed, the pci_epc_find_best_fit_window() would get the corresponding window. Cheers, --Prabhakar Lad