From: Vidya Sagar <vidyas@nvidia.com>
To: "Kunihiko Hayashi" <hayashi.kunihiko@socionext.com>,
"Jingoo Han" <jingoohan1@gmail.com>,
"Gustavo Pimentel" <gustavo.pimentel@synopsys.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Kishon Vijay Abraham I" <kishon@ti.com>
Cc: <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Xiaowei Bao <xiaowei.bao@nxp.com>
Subject: Re: [PATCH 2/2] PCI: designware-ep: Fix the access to DBI/iATU registers before enabling controller
Date: Tue, 3 Aug 2021 21:38:09 +0530 [thread overview]
Message-ID: <bc5b914e-16cb-a019-1b0e-6619a97cf00a@nvidia.com> (raw)
In-Reply-To: <1627429537-4554-3-git-send-email-hayashi.kunihiko@socionext.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
On 7/28/2021 5:15 AM, Kunihiko Hayashi wrote:
> External email: Use caution opening links or attachments
>
>
> 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().
>
> Cc: Xiaowei Bao <xiaowei.bao@nxp.com>
> Cc: Vidya Sagar <vidyas@nvidia.com>
> Fixes: 6bfc9c3a2c70 ("PCI: designware-ep: Move the function of getting MSI capability forward")
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.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 8d028a8..f0c93d7 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);
>
> --
> 2.7.4
>
prev parent reply other threads:[~2021-08-03 16:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 23:45 [PATCH 0/2] PCI: endpoint: Fix core_init_notifier feature Kunihiko Hayashi
2021-07-27 23:45 ` [PATCH 1/2] PCI: endpoint: pci-epf-test: register notifier if only core_init_notifier is enabled Kunihiko Hayashi
2021-07-28 2:05 ` Om Prakash Singh
2021-07-27 23:45 ` [PATCH 2/2] PCI: designware-ep: Fix the access to DBI/iATU registers before enabling controller Kunihiko Hayashi
2021-07-28 1:45 ` Om Prakash Singh
2021-08-03 16:08 ` Vidya Sagar [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bc5b914e-16cb-a019-1b0e-6619a97cf00a@nvidia.com \
--to=vidyas@nvidia.com \
--cc=bhelgaas@google.com \
--cc=gustavo.pimentel@synopsys.com \
--cc=hayashi.kunihiko@socionext.com \
--cc=jingoohan1@gmail.com \
--cc=kishon@ti.com \
--cc=kw@linux.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=robh@kernel.org \
--cc=xiaowei.bao@nxp.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).