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Date: Fri, 3 Dec 2021 10:36:00 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
Jingoo Han <jingoohan1@...il.com>,
Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Rob Herring <robh@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Bjorn Helgaas <bhelgaas@...gle.com>
CC: Xiaowei Bao <xiaowei.bao@....com>,
Om Prakash Singh <omp@...dia.com>,
Vidya Sagar <vidyas@...dia.com>, <linux-pci@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] PCI: designware-ep: Fix the access to DBI/iATU
registers before enabling controller
Hi Kunihiko,
On 01/09/21 10:46 am, Kunihiko Hayashi wrote:
> The driver using core_init_notifier, e.g. pcie-tegra194.c, runs according
> to the following sequence:
>
> probe()
> dw_pcie_ep_init()
>
> bind()
> dw_pcie_ep_start()
> enable_irq()
>
> (interrupt occurred)
> handler()
> [enable controller]
> dw_pcie_ep_init_complete()
> dw_pcie_ep_init_notify()
>
> After receiving an interrupt from RC, the handler enables the controller
> and the controller registers can be accessed.
> So accessing the registers should do in dw_pcie_ep_init_complete().
>
> Currently dw_pcie_ep_init() has functions dw_iatu_detect() and
> dw_pcie_ep_find_capability() that include accesses to DWC registers.
> As a result, accessing the registers before enabling the controller,
> the access will fail.
>
> The function dw_pcie_ep_init() shouldn't have any access to DWC registers
> if the controller is enabled after calling bind(). This moves access codes
> to DBI/iATU registers and depending variables from dw_pcie_ep_init() to
> dw_pcie_ep_init_complete().
Ideally pci_epc_create() should be the last step by the controller driver before
handing the control to the core EPC framework. Since after this step the EPC
framework can start invoking the epc_ops.
Here more stuff is being added to dw_pcie_ep_init_complete() which is required
for epc_ops and this could result in aborts for platforms which does not add
core_init_notifier.
Thanks,
Kishon
>
> Cc: Xiaowei Bao <xiaowei.bao@....com>
> Cc: Vidya Sagar <vidyas@...dia.com>
> Fixes: 6bfc9c3a2c70 ("PCI: designware-ep: Move the function of getting MSI capability forward")
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> Acked-by: Om Prakash Singh <omp@...dia.com>
> Reviewed-by: Vidya Sagar <vidyas@...dia.com>
> ---
> drivers/pci/controller/dwc/pcie-designware-ep.c | 81 +++++++++++++------------
> 1 file changed, 41 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 998b698..00ce83c 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -636,16 +636,56 @@ static unsigned int dw_pcie_ep_find_ext_capability(struct dw_pcie *pci, int cap)
> int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep)
> {
> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> + struct dw_pcie_ep_func *ep_func;
> + struct device *dev = pci->dev;
> unsigned int offset;
> unsigned int nbars;
> u8 hdr_type;
> + u8 func_no;
> + void *addr;
> u32 reg;
> int i;
>
> + dw_pcie_iatu_detect(pci);
> +
> + ep->ib_window_map = devm_kcalloc(dev,
> + BITS_TO_LONGS(pci->num_ib_windows),
> + sizeof(long),
> + GFP_KERNEL);
> + if (!ep->ib_window_map)
> + return -ENOMEM;
> +
> + ep->ob_window_map = devm_kcalloc(dev,
> + BITS_TO_LONGS(pci->num_ob_windows),
> + sizeof(long),
> + GFP_KERNEL);
> + if (!ep->ob_window_map)
> + return -ENOMEM;
> +
> + addr = devm_kcalloc(dev, pci->num_ob_windows, sizeof(phys_addr_t),
> + GFP_KERNEL);
> + if (!addr)
> + return -ENOMEM;
> + ep->outbound_addr = addr;
> +
> + for (func_no = 0; func_no < ep->epc->max_functions; func_no++) {
> + ep_func = devm_kzalloc(dev, sizeof(*ep_func), GFP_KERNEL);
> + if (!ep_func)
> + return -ENOMEM;
> +
> + ep_func->func_no = func_no;
> + ep_func->msi_cap = dw_pcie_ep_find_capability(ep, func_no,
> + PCI_CAP_ID_MSI);
> + ep_func->msix_cap = dw_pcie_ep_find_capability(ep, func_no,
> + PCI_CAP_ID_MSIX);
> +
> + list_add_tail(&ep_func->list, &ep->func_list);
> + }
> +
> hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE) &
> PCI_HEADER_TYPE_MASK;
> if (hdr_type != PCI_HEADER_TYPE_NORMAL) {
> - dev_err(pci->dev,
> + dev_err(dev,
> "PCIe controller is not set to EP mode (hdr_type:0x%x)!\n",
> hdr_type);
> return -EIO;
> @@ -674,8 +714,6 @@ EXPORT_SYMBOL_GPL(dw_pcie_ep_init_complete);
> int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> {
> int ret;
> - void *addr;
> - u8 func_no;
> struct resource *res;
> struct pci_epc *epc;
> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> @@ -683,7 +721,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> struct platform_device *pdev = to_platform_device(dev);
> struct device_node *np = dev->of_node;
> const struct pci_epc_features *epc_features;
> - struct dw_pcie_ep_func *ep_func;
>
> INIT_LIST_HEAD(&ep->func_list);
>
> @@ -705,8 +742,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> }
> }
>
> - dw_pcie_iatu_detect(pci);
> -
> res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
> if (!res)
> return -EINVAL;
> @@ -714,26 +749,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> ep->phys_base = res->start;
> ep->addr_size = resource_size(res);
>
> - ep->ib_window_map = devm_kcalloc(dev,
> - BITS_TO_LONGS(pci->num_ib_windows),
> - sizeof(long),
> - GFP_KERNEL);
> - if (!ep->ib_window_map)
> - return -ENOMEM;
> -
> - ep->ob_window_map = devm_kcalloc(dev,
> - BITS_TO_LONGS(pci->num_ob_windows),
> - sizeof(long),
> - GFP_KERNEL);
> - if (!ep->ob_window_map)
> - return -ENOMEM;
> -
> - addr = devm_kcalloc(dev, pci->num_ob_windows, sizeof(phys_addr_t),
> - GFP_KERNEL);
> - if (!addr)
> - return -ENOMEM;
> - ep->outbound_addr = addr;
> -
> if (pci->link_gen < 1)
> pci->link_gen = of_pci_get_max_link_speed(np);
>
> @@ -750,20 +765,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> if (ret < 0)
> epc->max_functions = 1;
>
> - for (func_no = 0; func_no < epc->max_functions; func_no++) {
> - ep_func = devm_kzalloc(dev, sizeof(*ep_func), GFP_KERNEL);
> - if (!ep_func)
> - return -ENOMEM;
> -
> - ep_func->func_no = func_no;
> - ep_func->msi_cap = dw_pcie_ep_find_capability(ep, func_no,
> - PCI_CAP_ID_MSI);
> - ep_func->msix_cap = dw_pcie_ep_find_capability(ep, func_no,
> - PCI_CAP_ID_MSIX);
> -
> - list_add_tail(&ep_func->list, &ep->func_list);
> - }
> -
> if (ep->ops->ep_init)
> ep->ops->ep_init(ep);
>
>
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