Re: [v5,5/6] usb: dwc3: use bus->sysdev for DMA configuration

From: Alexander Sverdlin
Date: Tue Dec 13 2016 - 18:59:12 EST

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Hi!

On 17/11/16 12:43, Sriram Dash wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> The dma ops for dwc3 devices are not set properly. So, use a
> physical device sysdev, which will be inherited from parent,
> to set the hardware / firmware parameters like dma.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Sriram Dash <sriram.dash@xxxxxxx>
> Tested-by: Baolin Wang <baolin.wang@xxxxxxxxxx>

Successfully tested on arm64/axxia with DWC3 USB host, XHCIs properly inherit
DMA configuration. Therefore:

Tested-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx>

> ---
> Changes in v5:
> - rebase to usb testing/next
>
> Changes in v4:
> - removed the ifdefs for pci
> - made the sysdev as a device property
> - phy create lookup take up the correct device.
>
> Changes in v3:
> - No update
>
> Changes in v2:
> - integrate dwc3 driver changes together
>
> drivers/usb/dwc3/core.c | 27 ++++++++++++++-------------
> drivers/usb/dwc3/core.h | 3 +++
> drivers/usb/dwc3/dwc3-pci.c | 10 ++++++++++
> drivers/usb/dwc3/ep0.c | 8 ++++----
> drivers/usb/dwc3/gadget.c | 33 +++++++++++++++++----------------
> drivers/usb/dwc3/host.c | 16 ++++++----------
> 6 files changed, 54 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index e951448..e5fbab2 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -202,7 +202,7 @@ static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
> static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
> struct dwc3_event_buffer *evt)
> {
> - dma_free_coherent(dwc->dev, evt->length, evt->buf, evt->dma);
> + dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
> }
>
> /**
> @@ -228,7 +228,7 @@ static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
> if (!evt->cache)
> return ERR_PTR(-ENOMEM);
>
> - evt->buf = dma_alloc_coherent(dwc->dev, length,
> + evt->buf = dma_alloc_coherent(dwc->sysdev, length,
> &evt->dma, GFP_KERNEL);
> if (!evt->buf)
> return ERR_PTR(-ENOMEM);
> @@ -341,11 +341,11 @@ static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
> if (!WARN_ON(dwc->scratchbuf))
> return 0;
>
> - scratch_addr = dma_map_single(dwc->dev, dwc->scratchbuf,
> + scratch_addr = dma_map_single(dwc->sysdev, dwc->scratchbuf,
> dwc->nr_scratch * DWC3_SCRATCHBUF_SIZE,
> DMA_BIDIRECTIONAL);
> - if (dma_mapping_error(dwc->dev, scratch_addr)) {
> - dev_err(dwc->dev, "failed to map scratch buffer\n");
> + if (dma_mapping_error(dwc->sysdev, scratch_addr)) {
> + dev_err(dwc->sysdev, "failed to map scratch buffer\n");
> ret = -EFAULT;
> goto err0;
> }
> @@ -369,7 +369,7 @@ static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
> return 0;
>
> err1:
> - dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
> + dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
> DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
>
> err0:
> @@ -388,7 +388,7 @@ static void dwc3_free_scratch_buffers(struct dwc3 *dwc)
> if (!WARN_ON(dwc->scratchbuf))
> return;
>
> - dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
> + dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
> DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
> kfree(dwc->scratchbuf);
> }
> @@ -927,6 +927,13 @@ static void dwc3_get_properties(struct dwc3 *dwc)
> dwc->dr_mode = usb_get_dr_mode(dev);
> dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node);
>
> + dwc->sysdev_is_parent = device_property_read_bool(dev,
> + "linux,sysdev_is_parent");
> + if (dwc->sysdev_is_parent)
> + dwc->sysdev = dwc->dev->parent;
> + else
> + dwc->sysdev = dwc->dev;
> +
> dwc->has_lpm_erratum = device_property_read_bool(dev,
> "snps,has-lpm-erratum");
> device_property_read_u8(dev, "snps,lpm-nyet-threshold",
> @@ -1097,12 +1104,6 @@ static int dwc3_probe(struct platform_device *pdev)
>
> spin_lock_init(&dwc->lock);
>
> - if (!dev->dma_mask) {
> - dev->dma_mask = dev->parent->dma_mask;
> - dev->dma_parms = dev->parent->dma_parms;
> - dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
> - }
> -
> pm_runtime_set_active(dev);
> pm_runtime_use_autosuspend(dev);
> pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index ef81fa5..de5a857 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -819,6 +819,7 @@ struct dwc3_scratchpad_array {
> * @ep0_bounced: true when we used bounce buffer
> * @ep0_expect_in: true when we expect a DATA IN transfer
> * @has_hibernation: true when dwc3 was configured with Hibernation
> + * @sysdev_is_parent: true when dwc3 device has a parent driver
> * @has_lpm_erratum: true when core was configured with LPM Erratum. Note that
> * there's now way for software to detect this in runtime.
> * @is_utmi_l1_suspend: the core asserts output signal
> @@ -875,6 +876,7 @@ struct dwc3 {
> spinlock_t lock;
>
> struct device *dev;
> + struct device *sysdev;
>
> struct platform_device *xhci;
> struct resource xhci_resources[DWC3_XHCI_RESOURCES_NUM];
> @@ -976,6 +978,7 @@ struct dwc3 {
> unsigned ep0_bounced:1;
> unsigned ep0_expect_in:1;
> unsigned has_hibernation:1;
> + unsigned sysdev_is_parent:1;
> unsigned has_lpm_erratum:1;
> unsigned is_utmi_l1_suspend:1;
> unsigned is_fpga:1;
> diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
> index 2b0e34d..2b73339 100644
> --- a/drivers/usb/dwc3/dwc3-pci.c
> +++ b/drivers/usb/dwc3/dwc3-pci.c
> @@ -73,6 +73,16 @@ static int dwc3_pci_quirks(struct dwc3_pci *dwc)
> {
> struct platform_device *dwc3 = dwc->dwc3;
> struct pci_dev *pdev = dwc->pci;
> + int ret;
> +
> + struct property_entry sysdev_property[] = {
> + PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
> + { },
> + };
> +
> + ret = platform_device_add_properties(dwc3, sysdev_property);
> + if (ret)
> + return ret;
>
> if (pdev->vendor == PCI_VENDOR_ID_AMD &&
> pdev->device == PCI_DEVICE_ID_AMD_NL_USB) {
> diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
> index 2b22ea7..2d7fb2d 100644
> --- a/drivers/usb/dwc3/ep0.c
> +++ b/drivers/usb/dwc3/ep0.c
> @@ -1000,8 +1000,8 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
> u32 transfer_size = 0;
> u32 maxpacket;
>
> - ret = usb_gadget_map_request(&dwc->gadget, &req->request,
> - dep->number);
> + ret = usb_gadget_map_request_by_dev(dwc->sysdev,
> + &req->request, dep->number);
> if (ret)
> return;
>
> @@ -1026,8 +1026,8 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
> dwc->ep0_bounce_addr, transfer_size,
> DWC3_TRBCTL_CONTROL_DATA, false);
> } else {
> - ret = usb_gadget_map_request(&dwc->gadget, &req->request,
> - dep->number);
> + ret = usb_gadget_map_request_by_dev(dwc->sysdev,
> + &req->request, dep->number);
> if (ret)
> return;
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index e2416de..6785595 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -183,8 +183,8 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
> if (dwc->ep0_bounced && dep->number == 0)
> dwc->ep0_bounced = false;
> else
> - usb_gadget_unmap_request(&dwc->gadget, &req->request,
> - req->direction);
> + usb_gadget_unmap_request_by_dev(dwc->sysdev,
> + &req->request, req->direction);
>
> trace_dwc3_gadget_giveback(req);
>
> @@ -399,7 +399,7 @@ static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
> if (dep->trb_pool)
> return 0;
>
> - dep->trb_pool = dma_alloc_coherent(dwc->dev,
> + dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
> sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
> &dep->trb_pool_dma, GFP_KERNEL);
> if (!dep->trb_pool) {
> @@ -415,7 +415,7 @@ static void dwc3_free_trb_pool(struct dwc3_ep *dep)
> {
> struct dwc3 *dwc = dep->dwc;
>
> - dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
> + dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
> dep->trb_pool, dep->trb_pool_dma);
>
> dep->trb_pool = NULL;
> @@ -1171,8 +1171,8 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
>
> trace_dwc3_ep_queue(req);
>
> - ret = usb_gadget_map_request(&dwc->gadget, &req->request,
> - dep->direction);
> + ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
> + dep->direction);
> if (ret)
> return ret;
>
> @@ -2977,7 +2977,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
>
> dwc->irq_gadget = irq;
>
> - dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
> + dwc->ctrl_req = dma_alloc_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
> &dwc->ctrl_req_addr, GFP_KERNEL);
> if (!dwc->ctrl_req) {
> dev_err(dwc->dev, "failed to allocate ctrl request\n");
> @@ -2985,8 +2985,9 @@ int dwc3_gadget_init(struct dwc3 *dwc)
> goto err0;
> }
>
> - dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
> - &dwc->ep0_trb_addr, GFP_KERNEL);
> + dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
> + sizeof(*dwc->ep0_trb) * 2,
> + &dwc->ep0_trb_addr, GFP_KERNEL);
> if (!dwc->ep0_trb) {
> dev_err(dwc->dev, "failed to allocate ep0 trb\n");
> ret = -ENOMEM;
> @@ -2999,7 +3000,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
> goto err2;
> }
>
> - dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
> + dwc->ep0_bounce = dma_alloc_coherent(dwc->sysdev,
> DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
> GFP_KERNEL);
> if (!dwc->ep0_bounce) {
> @@ -3072,18 +3073,18 @@ int dwc3_gadget_init(struct dwc3 *dwc)
>
> err4:
> dwc3_gadget_free_endpoints(dwc);
> - dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
> + dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
> dwc->ep0_bounce, dwc->ep0_bounce_addr);
>
> err3:
> kfree(dwc->setup_buf);
>
> err2:
> - dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
> + dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
> dwc->ep0_trb, dwc->ep0_trb_addr);
>
> err1:
> - dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
> + dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
> dwc->ctrl_req, dwc->ctrl_req_addr);
>
> err0:
> @@ -3098,16 +3099,16 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
>
> dwc3_gadget_free_endpoints(dwc);
>
> - dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
> + dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
> dwc->ep0_bounce, dwc->ep0_bounce_addr);
>
> kfree(dwc->setup_buf);
> kfree(dwc->zlp_buf);
>
> - dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
> + dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
> dwc->ep0_trb, dwc->ep0_trb_addr);
>
> - dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
> + dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
> dwc->ctrl_req, dwc->ctrl_req_addr);
> }
>
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index 8c2679e..487f0ff 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -84,11 +84,7 @@ int dwc3_host_init(struct dwc3 *dwc)
> return -ENOMEM;
> }
>
> - dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
> -
> xhci->dev.parent = dwc->dev;
> - xhci->dev.dma_mask = dwc->dev->dma_mask;
> - xhci->dev.dma_parms = dwc->dev->dma_parms;
>
> dwc->xhci = xhci;
>
> @@ -111,9 +107,9 @@ int dwc3_host_init(struct dwc3 *dwc)
> }
>
> phy_create_lookup(dwc->usb2_generic_phy, "usb2-phy",
> - dev_name(&xhci->dev));
> + dev_name(dwc->dev));
> phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
> - dev_name(&xhci->dev));
> + dev_name(dwc->dev));
>
> ret = platform_device_add(xhci);
> if (ret) {
> @@ -124,9 +120,9 @@ int dwc3_host_init(struct dwc3 *dwc)
> return 0;
> err2:
> phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> - dev_name(&xhci->dev));
> + dev_name(dwc->dev));
> phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> - dev_name(&xhci->dev));
> + dev_name(dwc->dev));
> err1:
> platform_device_put(xhci);
> return ret;
> @@ -135,8 +131,8 @@ int dwc3_host_init(struct dwc3 *dwc)
> void dwc3_host_exit(struct dwc3 *dwc)
> {
> phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> - dev_name(&dwc->xhci->dev));
> + dev_name(dwc->dev));
> phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> - dev_name(&dwc->xhci->dev));
> + dev_name(dwc->dev));
> platform_device_unregister(dwc->xhci);
> }
>

--
Best regards,
Alexander Sverdlin.

Next message: Andrew Donnellan: "Re: [PATCH 4.4 01/16] powerpc/eeh: Fix deadlock when PE frozen state cant be cleared"
Previous message: Cong Wang: "Re: CVE-2016-7097 causes acl leak"
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