From patchwork Thu May 7 12:33:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lad Prabhakar X-Patchwork-Id: 1285218 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=bp.renesas.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 49HtGG6JF6z9sSc for ; Thu, 7 May 2020 22:35:18 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727774AbgEGMfR (ORCPT ); Thu, 7 May 2020 08:35:17 -0400 Received: from relmlor2.renesas.com ([210.160.252.172]:5168 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725939AbgEGMfR (ORCPT ); Thu, 7 May 2020 08:35:17 -0400 X-IronPort-AV: E=Sophos;i="5.73,363,1583161200"; d="scan'208";a="46285064" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 07 May 2020 21:35:15 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 6E1814004D0E; Thu, 7 May 2020 21:35:11 +0900 (JST) From: Lad Prabhakar To: Lorenzo Pieralisi Cc: Rob Herring , Tom Joseph , Jingoo Han , Bjorn Helgaas , Gustavo Pimentel , Marek Vasut , Yoshihiro Shimoda , Shawn Lin , Heiko Stuebner , Kishon Vijay Abraham I , Geert Uytterhoeven , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Prabhakar , Lad Prabhakar Subject: [PATCH v10 5/8] PCI: endpoint: Add support to handle multiple base for mapping outbound memory Date: Thu, 7 May 2020 13:33:16 +0100 Message-Id: <1588854799-13710-6-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1588854799-13710-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <1588854799-13710-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org R-Car PCIe controller has support to map multiple memory regions for mapping the outbound memory in local system also the controller limits single allocation for each region (that is, once a chunk is used from the region it cannot be used to allocate a new one). This features inspires to add support for handling multiple memory bases in endpoint framework. With this patch pci_epc_mem_init() initializes address space for endpoint controller which support single window and pci_epc_multi_mem_init() initializes multiple windows supported by endpoint controller. Signed-off-by: Lad Prabhakar Reviewed-by: Yoshihiro Shimoda Acked-by: Kishon Vijay Abraham I --- .../pci/controller/dwc/pcie-designware-ep.c | 16 +- drivers/pci/endpoint/pci-epc-mem.c | 199 ++++++++++++------ include/linux/pci-epc.h | 33 ++- 3 files changed, 170 insertions(+), 78 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c index 1cdcbd102ce8..a78902cbf2f0 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -412,11 +412,11 @@ 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); + epc->mem->window.page_size); if (ret) return ret; @@ -459,9 +459,9 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no, return -EPERM; } - aligned_offset = msg_addr & (epc->mem->page_size - 1); + aligned_offset = msg_addr & (epc->mem->window.page_size - 1); ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr, - epc->mem->page_size); + epc->mem->window.page_size); if (ret) return ret; @@ -477,7 +477,7 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep) 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); } @@ -610,15 +610,15 @@ 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); + ret = pci_epc_mem_init(epc, ep->phys_base, ep->addr_size, + 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); + epc->mem->window.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/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c index cdd1d3821249..2325f74eda15 100644 --- a/drivers/pci/endpoint/pci-epc-mem.c +++ b/drivers/pci/endpoint/pci-epc-mem.c @@ -23,7 +23,7 @@ static int pci_epc_mem_get_order(struct pci_epc_mem *mem, size_t size) { int order; - unsigned int page_shift = ilog2(mem->page_size); + unsigned int page_shift = ilog2(mem->window.page_size); size--; size >>= page_shift; @@ -36,67 +36,95 @@ 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 + * pci_epc_multi_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 - * @page_size: size of each page + * @windows: pointer to windows supported by the device + * @num_windows: number of windows device supports * * 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_multi_mem_init(struct pci_epc *epc, + struct pci_epc_mem_window *windows, + unsigned int num_windows) { - 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; + size_t page_size; int bitmap_size; + int pages; + int ret; + int i; - if (page_size < PAGE_SIZE) - page_size = PAGE_SIZE; + epc->num_windows = 0; - page_shift = ilog2(page_size); - pages = size >> page_shift; - bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); + if (!windows || !num_windows) + return -EINVAL; - mem = kzalloc(sizeof(*mem), GFP_KERNEL); - if (!mem) { - ret = -ENOMEM; - goto err; - } + epc->windows = kcalloc(num_windows, sizeof(*mem), GFP_KERNEL); + if (!epc->windows) + return -ENOMEM; - bitmap = kzalloc(bitmap_size, GFP_KERNEL); - if (!bitmap) { - ret = -ENOMEM; - goto err_mem; - } + for (i = 0; i < num_windows; i++) { + page_size = windows[i].page_size; + if (page_size < PAGE_SIZE) + page_size = PAGE_SIZE; + page_shift = ilog2(page_size); + pages = windows[i].size >> 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; - mutex_init(&mem->lock); + mem = kzalloc(sizeof(*mem), GFP_KERNEL); + if (!mem) { + ret = -ENOMEM; + i--; + goto err_mem; + } - epc->mem = mem; + bitmap = kzalloc(bitmap_size, GFP_KERNEL); + if (!bitmap) { + ret = -ENOMEM; + kfree(mem); + i--; + goto err_mem; + } + + mem->window.phys_base = windows[i].phys_base; + mem->window.size = windows[i].size; + mem->window.page_size = page_size; + mem->bitmap = bitmap; + mem->pages = pages; + mutex_init(&mem->lock); + epc->windows[i] = mem; + } + + epc->mem = epc->windows[0]; + epc->num_windows = num_windows; return 0; err_mem: - kfree(mem); + for (; i >= 0; i--) { + mem = epc->windows[i]; + kfree(mem->bitmap); + kfree(mem); + } + kfree(epc->windows); -err: -return ret; + return ret; } -EXPORT_SYMBOL_GPL(__pci_epc_mem_init); +EXPORT_SYMBOL_GPL(pci_epc_multi_mem_init); int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base, size_t size, size_t page_size) { - return __pci_epc_mem_init(epc, base, size, page_size); + struct pci_epc_mem_window mem_window; + + mem_window.phys_base = base; + mem_window.size = size; + mem_window.page_size = page_size; + + return pci_epc_multi_mem_init(epc, &mem_window, 1); } EXPORT_SYMBOL_GPL(pci_epc_mem_init); @@ -109,11 +137,22 @@ 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->num_windows) + return; + + for (i = 0; i < epc->num_windows; i++) { + mem = epc->windows[i]; + kfree(mem->bitmap); + kfree(mem); + } + kfree(epc->windows); + + epc->windows = NULL; epc->mem = NULL; - kfree(mem->bitmap); - kfree(mem); + epc->num_windows = 0; } EXPORT_SYMBOL_GPL(pci_epc_mem_exit); @@ -129,31 +168,60 @@ EXPORT_SYMBOL_GPL(pci_epc_mem_exit); void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, phys_addr_t *phys_addr, size_t size) { - int pageno; void __iomem *virt_addr = NULL; - struct pci_epc_mem *mem = epc->mem; - unsigned int page_shift = ilog2(mem->page_size); + struct pci_epc_mem *mem; + unsigned int page_shift; + size_t align_size; + int pageno; int order; + int i; - size = ALIGN(size, mem->page_size); - order = pci_epc_mem_get_order(mem, size); - - mutex_lock(&mem->lock); - pageno = bitmap_find_free_region(mem->bitmap, mem->pages, order); - if (pageno < 0) - goto ret; + for (i = 0; i < epc->num_windows; i++) { + mem = epc->windows[i]; + mutex_lock(&mem->lock); + align_size = ALIGN(size, mem->window.page_size); + order = pci_epc_mem_get_order(mem, align_size); - *phys_addr = mem->phys_base + ((phys_addr_t)pageno << page_shift); - virt_addr = ioremap(*phys_addr, size); - if (!virt_addr) - bitmap_release_region(mem->bitmap, pageno, order); + pageno = bitmap_find_free_region(mem->bitmap, mem->pages, + order); + if (pageno >= 0) { + page_shift = ilog2(mem->window.page_size); + *phys_addr = mem->window.phys_base + + ((phys_addr_t)pageno << page_shift); + virt_addr = ioremap(*phys_addr, align_size); + if (!virt_addr) { + bitmap_release_region(mem->bitmap, + pageno, order); + mutex_unlock(&mem->lock); + continue; + } + mutex_unlock(&mem->lock); + return virt_addr; + } + mutex_unlock(&mem->lock); + } -ret: - mutex_unlock(&mem->lock); return virt_addr; } EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr); +static struct pci_epc_mem *pci_epc_get_matching_window(struct pci_epc *epc, + phys_addr_t phys_addr) +{ + struct pci_epc_mem *mem; + int i; + + for (i = 0; i < epc->num_windows; i++) { + mem = epc->windows[i]; + + if (phys_addr >= mem->window.phys_base && + phys_addr < (mem->window.phys_base + mem->window.size)) + return mem; + } + + return NULL; +} + /** * pci_epc_mem_free_addr() - free the allocated memory address * @epc: the EPC device on which memory was allocated @@ -166,14 +234,23 @@ EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr); void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr, void __iomem *virt_addr, size_t size) { + struct pci_epc_mem *mem; + unsigned int page_shift; + size_t page_size; int pageno; - struct pci_epc_mem *mem = epc->mem; - unsigned int page_shift = ilog2(mem->page_size); int order; + mem = pci_epc_get_matching_window(epc, phys_addr); + if (!mem) { + pr_err("failed to get matching window\n"); + return; + } + + page_size = mem->window.page_size; + page_shift = ilog2(page_size); iounmap(virt_addr); - pageno = (phys_addr - mem->phys_base) >> page_shift; - size = ALIGN(size, mem->page_size); + pageno = (phys_addr - mem->window.phys_base) >> page_shift; + size = ALIGN(size, page_size); order = pci_epc_mem_get_order(mem, size); mutex_lock(&mem->lock); bitmap_release_region(mem->bitmap, pageno, order); diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 5bc1de65849e..cc66bec8be90 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -65,20 +65,28 @@ struct pci_epc_ops { struct module *owner; }; +/** + * struct pci_epc_mem_window - address window of the endpoint controller + * @phys_base: physical base address of the PCI address window + * @size: the size of the PCI address window + * @page_size: size of each page + */ +struct pci_epc_mem_window { + phys_addr_t phys_base; + size_t size; + size_t page_size; +}; + /** * struct pci_epc_mem - address space of the endpoint controller - * @phys_base: physical base address of the PCI address space - * @size: the size of the PCI address space + * @window: address window of the endpoint controller * @bitmap: bitmap to manage the PCI address space * @pages: number of bits representing the address region - * @page_size: size of each page * @lock: mutex to protect bitmap */ struct pci_epc_mem { - phys_addr_t phys_base; - size_t size; + struct pci_epc_mem_window window; unsigned long *bitmap; - size_t page_size; int pages; /* mutex to protect against concurrent access for memory allocation*/ struct mutex lock; @@ -89,7 +97,11 @@ struct pci_epc_mem { * @dev: PCI EPC device * @pci_epf: list of endpoint functions present in this EPC device * @ops: function pointers for performing endpoint operations - * @mem: address space of the endpoint controller + * @windows: array of address space of the endpoint controller + * @mem: first window of the endpoint controller, which corresponds to + * default address space of the endpoint controller supporting + * single window. + * @num_windows: number of windows supported by device * @max_functions: max number of functions that can be configured in this EPC * @group: configfs group representing the PCI EPC device * @lock: mutex to protect pci_epc ops @@ -100,7 +112,9 @@ struct pci_epc { struct device dev; struct list_head pci_epf; const struct pci_epc_ops *ops; + struct pci_epc_mem **windows; struct pci_epc_mem *mem; + unsigned int num_windows; u8 max_functions; struct config_group *group; /* mutex to protect against concurrent access of EP controller */ @@ -194,8 +208,9 @@ void pci_epc_put(struct pci_epc *epc); int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base, size_t size, size_t page_size); -int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size, - size_t page_size); +int pci_epc_multi_mem_init(struct pci_epc *epc, + struct pci_epc_mem_window *window, + unsigned int num_windows); void pci_epc_mem_exit(struct pci_epc *epc); void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, phys_addr_t *phys_addr, size_t size);