Linaro-mm-sig

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24 participants
2727 discussions

Re: [Linaro-mm-sig] [PATCH v6 1/2] habanalabs: define uAPI to export FD for DMA-BUF

by Jason Gunthorpe

On Sun, Sep 12, 2021 at 07:53:08PM +0300, Oded Gabbay wrote: > /* HL_MEM_OP_* */ > __u32 op; > - /* HL_MEM_* flags */ > + /* HL_MEM_* flags. > + * For the HL_MEM_OP_EXPORT_DMABUF_FD opcode, this field holds the > + * DMA-BUF file/FD flags. > + */ > __u32 flags; > /* Context ID - Currently not in use */ > __u32 ctx_id; > @@ -1072,6 +1091,13 @@ struct hl_mem_out { > > __u32 pad; > }; > + > + /* Returned in HL_MEM_OP_EXPORT_DMABUF_FD. Represents the > + * DMA-BUF object that was created to describe a memory > + * allocation on the device's memory space. The FD should be > + * passed to the importer driver > + */ > + __u64 fd; fd's should be a s32 type in a fixed width uapi. I usually expect to see the uapi changes inside the commit that consumes them, splitting the patch like this seems strange but harmless. Jason

3 years, 6 months

[PATCH v3 0/9] dma-fence: Deadline awareness

by Rob Clark

From: Rob Clark <robdclark(a)chromium.org> This series adds deadline awareness to fences, so realtime deadlines such as vblank can be communicated to the fence signaller for power/ frequency management decisions. This is partially inspired by a trick i915 does, but implemented via dma-fence for a couple of reasons: 1) To continue to be able to use the atomic helpers 2) To support cases where display and gpu are different drivers This iteration adds a dma-fence ioctl to set a deadline (both to support igt-tests, and compositors which delay decisions about which client buffer to display), and a sw_sync ioctl to read back the deadline. IGT tests utilizing these can be found at: https://gitlab.freedesktop.org/robclark/igt-gpu-tools/-/commits/fence-deadl… v1: https://patchwork.freedesktop.org/series/93035/ v2: Move filtering out of later deadlines to fence implementation to avoid increasing the size of dma_fence v3: Add support in fence-array and fence-chain; Add some uabi to support igt tests and userspace compositors. Rob Clark (9): dma-fence: Add deadline awareness drm/vblank: Add helper to get next vblank time drm/atomic-helper: Set fence deadline for vblank drm/scheduler: Add fence deadline support drm/msm: Add deadline based boost support dma-buf/fence-array: Add fence deadline support dma-buf/fence-chain: Add fence deadline support dma-buf/sync_file: Add SET_DEADLINE ioctl dma-buf/sw_sync: Add fence deadline support drivers/dma-buf/dma-fence-array.c | 11 ++++ drivers/dma-buf/dma-fence-chain.c | 13 +++++ drivers/dma-buf/dma-fence.c | 20 +++++++ drivers/dma-buf/sw_sync.c | 58 +++++++++++++++++++ drivers/dma-buf/sync_debug.h | 2 + drivers/dma-buf/sync_file.c | 19 +++++++ drivers/gpu/drm/drm_atomic_helper.c | 36 ++++++++++++ drivers/gpu/drm/drm_vblank.c | 32 +++++++++++ drivers/gpu/drm/msm/msm_fence.c | 76 +++++++++++++++++++++++++ drivers/gpu/drm/msm/msm_fence.h | 20 +++++++ drivers/gpu/drm/msm/msm_gpu.h | 1 + drivers/gpu/drm/msm/msm_gpu_devfreq.c | 20 +++++++ drivers/gpu/drm/scheduler/sched_fence.c | 34 +++++++++++ drivers/gpu/drm/scheduler/sched_main.c | 2 +- include/drm/drm_vblank.h | 1 + include/drm/gpu_scheduler.h | 8 +++ include/linux/dma-fence.h | 16 ++++++ include/uapi/linux/sync_file.h | 20 +++++++ 18 files changed, 388 insertions(+), 1 deletion(-) -- 2.31.1

3 years, 7 months

[PATCH 1/4] dma-buf: add dma_fence_describe and dma_resv_describe

by Christian König

Add functions to dump dma_fence and dma_resv objects into a seq_file and use them for printing the debugfs informations. Signed-off-by: Christian König <christian.koenig(a)amd.com> --- drivers/dma-buf/dma-buf.c | 11 +---------- drivers/dma-buf/dma-fence.c | 16 ++++++++++++++++ drivers/dma-buf/dma-resv.c | 23 +++++++++++++++++++++++ include/linux/dma-fence.h | 1 + include/linux/dma-resv.h | 1 + 5 files changed, 42 insertions(+), 10 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index d35c71743ccb..4975c9289b02 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1368,8 +1368,6 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused) { struct dma_buf *buf_obj; struct dma_buf_attachment *attach_obj; - struct dma_resv_iter cursor; - struct dma_fence *fence; int count = 0, attach_count; size_t size = 0; int ret; @@ -1397,14 +1395,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused) file_inode(buf_obj->file)->i_ino, buf_obj->name ?: ""); - dma_resv_for_each_fence(&cursor, buf_obj->resv, true, fence) { - seq_printf(s, "\t%s fence: %s %s %ssignalled\n", - dma_resv_iter_is_exclusive(&cursor) ? - "Exclusive" : "Shared", - fence->ops->get_driver_name(fence), - fence->ops->get_timeline_name(fence), - dma_fence_is_signaled(fence) ? "" : "un"); - } + dma_resv_describe(buf_obj->resv, s); seq_puts(s, "\tAttached Devices:\n"); attach_count = 0; diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 1e82ecd443fa..5175adf58644 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -907,6 +907,22 @@ dma_fence_wait_any_timeout(struct dma_fence **fences, uint32_t count, } EXPORT_SYMBOL(dma_fence_wait_any_timeout); +/** + * dma_fence_describe - Dump fence describtion into seq_file + * @fence: the 6fence to describe + * @seq: the seq_file to put the textual description into + * + * Dump a textual description of the fence and it's state into the seq_file. + */ +void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq) +{ + seq_printf(seq, "%s %s seq %llu %ssignalled\n", + fence->ops->get_driver_name(fence), + fence->ops->get_timeline_name(fence), fence->seqno, + dma_fence_is_signaled(fence) ? "" : "un"); +} +EXPORT_SYMBOL(dma_fence_describe); + /** * dma_fence_init - Initialize a custom fence. * @fence: the fence to initialize diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 266ec9e3caef..6bb25d53e702 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -38,6 +38,7 @@ #include <linux/mm.h> #include <linux/sched/mm.h> #include <linux/mmu_notifier.h> +#include <linux/seq_file.h> /** * DOC: Reservation Object Overview @@ -654,6 +655,28 @@ bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all) } EXPORT_SYMBOL_GPL(dma_resv_test_signaled); +/** + * dma_resv_describe - Dump description of the resv object into seq_file + * @obj: the reservation object + * @seq: the seq_file to dump the description into + * + * Dump a textual description of the fences inside an dma_resv object into the + * seq_file. + */ +void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq) +{ + struct dma_resv_iter cursor; + struct dma_fence *fence; + + dma_resv_for_each_fence(&cursor, obj, true, fence) { + seq_printf(seq, "\t%s fence:", + dma_resv_iter_is_exclusive(&cursor) ? + "Exclusive" : "Shared"); + dma_fence_describe(fence, seq); + } +} +EXPORT_SYMBOL_GPL(dma_resv_describe); + #if IS_ENABLED(CONFIG_LOCKDEP) static int __init dma_resv_lockdep(void) { diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index a706b7bf51d7..1ea691753bd3 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -264,6 +264,7 @@ void dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops, void dma_fence_release(struct kref *kref); void dma_fence_free(struct dma_fence *fence); +void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq); /** * dma_fence_put - decreases refcount of the fence diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index d4b4cd43f0f1..49c0152073fd 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -486,5 +486,6 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src); long dma_resv_wait_timeout(struct dma_resv *obj, bool wait_all, bool intr, unsigned long timeout); bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all); +void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq); #endif /* _LINUX_RESERVATION_H */ -- 2.25.1

3 years, 7 months

Re: [Linaro-mm-sig] [PATCH net-next 3/5] net: bcmasp: Add support for ASP2.0 Ethernet controller

by Andrew Lunn

> > > +static int bcmasp_set_priv_flags(struct net_device *dev, u32 flags) > > > +{ > > > + struct bcmasp_intf *intf = netdev_priv(dev); > > > + > > > + intf->wol_keep_rx_en = flags & BCMASP_WOL_KEEP_RX_EN ? 1 : 0; > > > + > > > + return 0; > > > > Please could you explain this some more. How can you disable RX and > > still have WoL working? > > Wake-on-LAN using Magic Packets and network filters requires keeping the > UniMAC's receiver turned on, and then the packets feed into the Magic Packet > Detector (MPD) block or the network filter block. In that mode DRAM is in > self refresh and there is local matching of frames into a tiny FIFO however > in the case of magic packets the packets leading to a wake-up are dropped as > there is nowhere to store them. In the case of a network filter match (e.g.: > matching a multicast IP address plus protocol, plus source/destination > ports) the packets are also discarded because the receive DMA was shut down. > > When the wol_keep_rx_en flag is set, the above happens but we also allow the > packets that did match a network filter to reach the small FIFO (Justin > would know how many entries are there) that is used to push the packets to > DRAM. The packet contents are held in there until the system wakes up which > is usually just a few hundreds of micro seconds after we received a packet > that triggered a wake-up. Once we overflow the receive DMA FIFO capacity > subsequent packets get dropped which is fine since we are usually talking > about very low bit rates, and we only try to push to DRAM the packets of > interest, that is those for which we have a network filter. > > This is convenient in scenarios where you want to wake-up from multicast DNS > (e.g.: wake on Googlecast, Bonjour etc.) because then the packet that > resulted in the system wake-up is not discarded but is then delivered to the > network stack. Thanks for the explanation. It would be easier for the user if you automate this. Enable is by default for WoL types which have user content? > > > + /* Per ch */ > > > + intf->tx_spb_dma = priv->base + TX_SPB_DMA_OFFSET(intf); > > > + intf->res.tx_spb_ctrl = priv->base + TX_SPB_CTRL_OFFSET(intf); > > > + /* > > > + * Stop gap solution. This should be removed when 72165a0 is > > > + * deprecated > > > + */ > > > > Is that an internal commit? > > Yes this is a revision of the silicon that is not meant to see the light of > day. So this can all be removed? Andrew

3 years, 7 months

Re: [Linaro-mm-sig] [PATCH net-next 2/5] dt-bindings: net: brcm, unimac-mdio: Add asp-v2.0

by Rob Herring

On Fri, 24 Sep 2021 14:44:48 -0700, Justin Chen wrote: > The ASP 2.0 Ethernet controller uses a brcm unimac. > > Signed-off-by: Justin Chen <justinpopo6(a)gmail.com> > Signed-off-by: Florian Fainelli <f.fainelli(a)gmail.com> > --- > Documentation/devicetree/bindings/net/brcm,unimac-mdio.yaml | 1 + > 1 file changed, 1 insertion(+) > Running 'make dtbs_check' with the schema in this patch gives the following warnings. Consider if they are expected or the schema is incorrect. These may not be new warnings. Note that it is not yet a requirement to have 0 warnings for dtbs_check. This will change in the future. Full log is available here: https://patchwork.ozlabs.org/patch/1532529 mdio@e14: #address-cells:0:0: 1 was expected arch/arm64/boot/dts/broadcom/bcm2711-rpi-400.dt.yaml arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b.dt.yaml arch/arm/boot/dts/bcm2711-rpi-400.dt.yaml arch/arm/boot/dts/bcm2711-rpi-4-b.dt.yaml mdio@e14: #size-cells:0:0: 0 was expected arch/arm64/boot/dts/broadcom/bcm2711-rpi-400.dt.yaml arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b.dt.yaml arch/arm/boot/dts/bcm2711-rpi-400.dt.yaml arch/arm/boot/dts/bcm2711-rpi-4-b.dt.yaml

3 years, 7 months

Re: [Linaro-mm-sig] [PATCH net-next 1/5] dt-bindings: net: Brcm ASP 2.0 Ethernet controller

by Rob Herring

On Fri, 24 Sep 2021 14:44:47 -0700, Justin Chen wrote: > From: Florian Fainelli <f.fainelli(a)gmail.com> > > Add a binding document for the Broadcom ASP 2.0 Ethernet controller. > > Signed-off-by: Florian Fainelli <f.fainelli(a)gmail.com> > Signed-off-by: Justin Chen <justinpopo6(a)gmail.com> > --- > .../devicetree/bindings/net/brcm,asp-v2.0.yaml | 147 +++++++++++++++++++++ > 1 file changed, 147 insertions(+) > create mode 100644 Documentation/devicetree/bindings/net/brcm,asp-v2.0.yaml > My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check' on your patch (DT_CHECKER_FLAGS is new in v5.13): yamllint warnings/errors: ./Documentation/devicetree/bindings/net/brcm,asp-v2.0.yaml:79:10: [warning] wrong indentation: expected 10 but found 9 (indentation) dtschema/dtc warnings/errors: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/net/brcm,asp-v2.0.example.dt.yaml: asp@9c00000: 'mdio@c614', 'mdio@ce14' do not match any of the regexes: 'pinctrl-[0-9]+' From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/net/brcm,asp-v2.0.yaml Documentation/devicetree/bindings/net/brcm,asp-v2.0.example.dt.yaml:0:0: /example-0/asp@9c00000/mdio@c614: failed to match any schema with compatible: ['brcm,asp-v2.0-mdio'] Documentation/devicetree/bindings/net/brcm,asp-v2.0.example.dt.yaml:0:0: /example-0/asp@9c00000/mdio@ce14: failed to match any schema with compatible: ['brcm,asp-v2.0-mdio'] doc reference errors (make refcheckdocs): See https://patchwork.ozlabs.org/patch/1532528 This check can fail if there are any dependencies. The base for a patch series is generally the most recent rc1. If you already ran 'make dt_binding_check' and didn't see the above error(s), then make sure 'yamllint' is installed and dt-schema is up to date: pip3 install dtschema --upgrade Please check and re-submit.

3 years, 7 months

Re: [Linaro-mm-sig] [PATCH net-next 3/5] net: bcmasp: Add support for ASP2.0 Ethernet controller

by Andrew Lunn

> +static int bcmasp_probe(struct platform_device *pdev) > +{ > + struct bcmasp_priv *priv; > + struct device_node *ports_node, *intf_node; > + struct device *dev = &pdev->dev; > + int ret, i, wol_irq, count = 0; > + struct bcmasp_intf *intf; > + struct resource *r; > + u32 u32_reserved_filters_bitmask; > + DECLARE_BITMAP(reserved_filters_bitmask, ASP_RX_NET_FILTER_MAX); > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->irq = platform_get_irq(pdev, 0); > + if (priv->irq <= 0) { > + dev_err(dev, "invalid interrupt\n"); > + return -EINVAL; > + } > + > + priv->clk = devm_clk_get(dev, "sw_asp"); > + if (IS_ERR(priv->clk)) { > + if (PTR_ERR(priv->clk) == -EPROBE_DEFER) > + return -EPROBE_DEFER; > + dev_warn(dev, "failed to request clock\n"); > + priv->clk = NULL; > + } devm_clk_get_optional() makes this simpler/ > + > + /* Base from parent node */ > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + priv->base = devm_ioremap_resource(&pdev->dev, r); > + if (IS_ERR(priv->base)) { > + dev_err(dev, "failed to iomap\n"); > + return PTR_ERR(priv->base); > + } > + > + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40)); > + if (ret) > + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); > + if (ret) { > + dev_err(&pdev->dev, "unable to set DMA mask: %d\n", ret); > + return ret; > + } > + > + dev_set_drvdata(&pdev->dev, priv); > + priv->pdev = pdev; > + spin_lock_init(&priv->mda_lock); > + spin_lock_init(&priv->clk_lock); > + mutex_init(&priv->net_lock); > + > + ret = clk_prepare_enable(priv->clk); > + if (ret) > + return ret; > + > + /* Enable all clocks to ensure successful probing */ > + bcmasp_core_clock_set(priv, ASP_CTRL_CLOCK_CTRL_ASP_ALL_DISABLE, 0); > + > + /* Switch to the main clock */ > + bcmasp_core_clock_select(priv, false); > + > + _intr2_mask_set(priv, 0xffffffff); > + intr2_core_wl(priv, 0xffffffff, ASP_INTR2_CLEAR); > + > + ret = devm_request_irq(&pdev->dev, priv->irq, bcmasp_isr, 0, > + pdev->name, priv); > + if (ret) { > + dev_err(dev, "failed to request ASP interrupt: %d\n", ret); > + return ret; > + } Do you need to undo clk_prepare_enable()? > + > + /* Register mdio child nodes */ > + of_platform_populate(dev->of_node, bcmasp_mdio_of_match, NULL, > + dev); > + > + ret = of_property_read_u32(dev->of_node, > + "brcm,reserved-net-filters-mask", > + &u32_reserved_filters_bitmask); > + if (ret) > + u32_reserved_filters_bitmask = 0; > + > + priv->net_filters_count_max = ASP_RX_NET_FILTER_MAX; > + bitmap_zero(reserved_filters_bitmask, priv->net_filters_count_max); > + bitmap_from_arr32(reserved_filters_bitmask, > + &u32_reserved_filters_bitmask, > + priv->net_filters_count_max); > + > + /* Discover bitmask of reserved filters */ > + for_each_set_bit(i, reserved_filters_bitmask, ASP_RX_NET_FILTER_MAX) { > + priv->net_filters[i].reserved = true; > + priv->net_filters_count_max--; > + } > + > + /* > + * ASP specific initialization, Needs to be done irregardless of > + * of how many interfaces come up. > + */ > + bcmasp_core_init(priv); > + bcmasp_core_init_filters(priv); > + > + ports_node = of_find_node_by_name(dev->of_node, "ethernet-ports"); > + if (!ports_node) { > + dev_warn(dev, "No ports found\n"); > + return 0; > + } > + > + priv->intf_count = of_get_available_child_count(ports_node); > + > + priv->intfs = devm_kcalloc(dev, priv->intf_count, > + sizeof(struct bcmasp_intf *), > + GFP_KERNEL); > + if (!priv->intfs) > + return -ENOMEM; > + > + /* Probe each interface (Initalization should continue even if > + * interfaces are unable to come up) > + */ > + i = 0; > + for_each_available_child_of_node(ports_node, intf_node) { > + wol_irq = platform_get_irq_optional(pdev, i + 1); > + priv->intfs[i++] = bcmasp_interface_create(priv, intf_node, > + wol_irq); > + } > + > + /* Drop the clock reference count now and let ndo_open()/ndo_close() > + * manage it for us from now on. > + */ > + bcmasp_core_clock_set(priv, 0, ASP_CTRL_CLOCK_CTRL_ASP_ALL_DISABLE); > + > + clk_disable_unprepare(priv->clk); > + > + /* Now do the registration of the network ports which will take care of > + * managing the clock properly. > + */ > + for (i = 0; i < priv->intf_count; i++) { > + intf = priv->intfs[i]; > + if (!intf) > + continue; > + > + ret = register_netdev(intf->ndev); > + if (ret) { > + netdev_err(intf->ndev, > + "failed to register net_device: %d\n", ret); > + bcmasp_interface_destroy(intf, false); > + continue; > + } > + count++; > + } > + > + dev_info(dev, "Initialized %d port(s)\n", count); > + > + return 0; > +} > + > +static int bcmasp_remove(struct platform_device *pdev) > +{ > + struct bcmasp_priv *priv = dev_get_drvdata(&pdev->dev); > + struct bcmasp_intf *intf; > + int i; > + > + for (i = 0; i < priv->intf_count; i++) { > + intf = priv->intfs[i]; > + if (!intf) > + continue; > + > + bcmasp_interface_destroy(intf, true); > + } > + > + return 0; > +} Do you need to depopulate the mdio children? > +static void bcmasp_get_drvinfo(struct net_device *dev, > + struct ethtool_drvinfo *info) > +{ > + strlcpy(info->driver, "bcmasp", sizeof(info->driver)); > + strlcpy(info->version, "v2.0", sizeof(info->version)); Please drop version. The core will fill it in with the kernel version, which is more useful. > +static int bcmasp_nway_reset(struct net_device *dev) > +{ > + if (!dev->phydev) > + return -ENODEV; > + > + return genphy_restart_aneg(dev->phydev); > +} phy_ethtool_nway_reset(). > +static void bcmasp_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol) > +{ > + struct bcmasp_intf *intf = netdev_priv(dev); > + > + wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER; > + wol->wolopts = intf->wolopts; > + memset(wol->sopass, 0, sizeof(wol->sopass)); > + > + if (wol->wolopts & WAKE_MAGICSECURE) > + memcpy(wol->sopass, intf->sopass, sizeof(intf->sopass)); > +} Maybe consider calling into the PHY to see what it can do? If the PHY can do the WoL you want, it will do it with less power. > +static int bcmasp_set_priv_flags(struct net_device *dev, u32 flags) > +{ > + struct bcmasp_intf *intf = netdev_priv(dev); > + > + intf->wol_keep_rx_en = flags & BCMASP_WOL_KEEP_RX_EN ? 1 : 0; > + > + return 0; Please could you explain this some more. How can you disable RX and still have WoL working? > +static void bcmasp_adj_link(struct net_device *dev) > +{ > + struct bcmasp_intf *intf = netdev_priv(dev); > + struct phy_device *phydev = dev->phydev; > + int changed = 0; > + u32 cmd_bits = 0, reg; > + > + if (intf->old_link != phydev->link) { > + changed = 1; > + intf->old_link = phydev->link; > + } > + > + if (intf->old_duplex != phydev->duplex) { > + changed = 1; > + intf->old_duplex = phydev->duplex; > + } > + > + switch (phydev->speed) { > + case SPEED_2500: > + cmd_bits = UMC_CMD_SPEED_2500; All i've seen is references to RGMII. Is 2500 possible? > + break; > + case SPEED_1000: > + cmd_bits = UMC_CMD_SPEED_1000; > + break; > + case SPEED_100: > + cmd_bits = UMC_CMD_SPEED_100; > + break; > + case SPEED_10: > + cmd_bits = UMC_CMD_SPEED_10; > + break; > + default: > + break; > + } > + cmd_bits <<= UMC_CMD_SPEED_SHIFT; > + > + if (phydev->duplex == DUPLEX_HALF) > + cmd_bits |= UMC_CMD_HD_EN; > + > + if (intf->old_pause != phydev->pause) { > + changed = 1; > + intf->old_pause = phydev->pause; > + } > + > + if (!phydev->pause) > + cmd_bits |= UMC_CMD_RX_PAUSE_IGNORE | UMC_CMD_TX_PAUSE_IGNORE; > + > + if (!changed) > + return; Shouldn't there be a comparison intd->old_speed != phydev->speed? You are risking the PHY can change speed without doing a link down/up? > + > + if (phydev->link) { > + reg = umac_rl(intf, UMC_CMD); > + reg &= ~((UMC_CMD_SPEED_MASK << UMC_CMD_SPEED_SHIFT) | > + UMC_CMD_HD_EN | UMC_CMD_RX_PAUSE_IGNORE | > + UMC_CMD_TX_PAUSE_IGNORE); > + reg |= cmd_bits; > + umac_wl(intf, reg, UMC_CMD); > + > + /* Enable RGMII pad */ > + reg = rgmii_rl(intf, RGMII_OOB_CNTRL); > + reg |= RGMII_MODE_EN; > + rgmii_wl(intf, reg, RGMII_OOB_CNTRL); > + > + intf->eee.eee_active = phy_init_eee(phydev, 0) >= 0; > + bcmasp_eee_enable_set(intf, intf->eee.eee_active); > + } else { > + /* Disable RGMII pad */ > + reg = rgmii_rl(intf, RGMII_OOB_CNTRL); > + reg &= ~RGMII_MODE_EN; > + rgmii_wl(intf, reg, RGMII_OOB_CNTRL); > + } > + > + if (changed) > + phy_print_status(phydev); There has already been a return if !changed. > +static void bcmasp_configure_port(struct bcmasp_intf *intf) > +{ > + u32 reg, id_mode_dis = 0; > + > + reg = rgmii_rl(intf, RGMII_PORT_CNTRL); > + reg &= ~RGMII_PORT_MODE_MASK; > + > + switch (intf->phy_interface) { > + case PHY_INTERFACE_MODE_RGMII: > + /* RGMII_NO_ID: TXC transitions at the same time as TXD > + * (requires PCB or receiver-side delay) > + * RGMII: Add 2ns delay on TXC (90 degree shift) > + * > + * ID is implicitly disabled for 100Mbps (RG)MII operation. > + */ > + id_mode_dis = RGMII_ID_MODE_DIS; > + fallthrough; > + case PHY_INTERFACE_MODE_RGMII_TXID: > + reg |= RGMII_PORT_MODE_EXT_GPHY; > + break; > + case PHY_INTERFACE_MODE_MII: > + reg |= RGMII_PORT_MODE_EXT_EPHY; > + break; > + default: > + break; > + } Can we skip this and let the PHY do the delays? Ah, "This is an ugly quirk..." Maybe add a comment here pointing towards bcmasp_netif_init(), which is explains this. > +static int bcmasp_netif_init(struct net_device *dev, bool phy_connect, > + bool init_rx) > +{ > + struct bcmasp_intf *intf = netdev_priv(dev); > + phy_interface_t phy_iface = intf->phy_interface; > + u32 phy_flags = PHY_BRCM_AUTO_PWRDWN_ENABLE | > + PHY_BRCM_DIS_TXCRXC_NOENRGY | > + PHY_BRCM_IDDQ_SUSPEND; > + struct phy_device *phydev = NULL; > + int ret; > + > + /* Always enable interface clocks */ > + bcmasp_core_clock_set_intf(intf, true); > + > + /* Enable internal PHY before any MAC activity */ > + if (intf->internal_phy) > + bcmasp_ephy_enable_set(intf, true); > + > + bcmasp_configure_port(intf); > + > + /* This is an ugly quirk but we have not been correctly interpreting > + * the phy_interface values and we have done that across different > + * drivers, so at least we are consistent in our mistakes. > + * > + * When the Generic PHY driver is in use either the PHY has been > + * strapped or programmed correctly by the boot loader so we should > + * stick to our incorrect interpretation since we have validated it. > + * > + * Now when a dedicated PHY driver is in use, we need to reverse the > + * meaning of the phy_interface_mode values to something that the PHY > + * driver will interpret and act on such that we have two mistakes > + * canceling themselves so to speak. We only do this for the two > + * modes that GENET driver officially supports on Broadcom STB chips: > + * PHY_INTERFACE_MODE_RGMII and PHY_INTERFACE_MODE_RGMII_TXID. Other > + * modes are not *officially* supported with the boot loader and the > + * scripted environment generating Device Tree blobs for those > + * platforms. > + * > + * Note that internal PHY and fixed-link configurations are not > + * affected because they use different phy_interface_t values or the > + * Generic PHY driver. > + */ > +static inline void bcmasp_map_res(struct bcmasp_priv *priv, > + struct bcmasp_intf *intf) > +{ > + /* Per port */ > + intf->res.umac = priv->base + UMC_OFFSET(intf); > + intf->res.umac2fb = priv->base + UMAC2FB_OFFSET(intf); > + intf->res.rgmii = priv->base + RGMII_OFFSET(intf); > + > + /* Per ch */ > + intf->tx_spb_dma = priv->base + TX_SPB_DMA_OFFSET(intf); > + intf->res.tx_spb_ctrl = priv->base + TX_SPB_CTRL_OFFSET(intf); > + /* > + * Stop gap solution. This should be removed when 72165a0 is > + * deprecated > + */ Is that an internal commit? Andrew

3 years, 7 months

Re: [Linaro-mm-sig] [PATCH net-next 0/5] brcm ASP 2.0 Ethernet controller

by Andrew Lunn

On Fri, Sep 24, 2021 at 02:44:46PM -0700, Justin Chen wrote: > This patch set adds support for Broadcom's ASP 2.0 Ethernet controller. Hi Justin Does the hardware support L2 switching between the two ports? I'm just wondering if later this is going to be modified into a switchdev driver? Andrew

3 years, 7 months

[PATCH 01/27] dma-buf: add dma_resv_for_each_fence_unlocked v6

by Christian König

Abstract the complexity of iterating over all the fences in a dma_resv object. The new loop handles the whole RCU and retry dance and returns only fences where we can be sure we grabbed the right one. v2: fix accessing the shared fences while they might be freed, improve kerneldoc, rename _cursor to _iter, add dma_resv_iter_is_exclusive, add dma_resv_iter_begin/end v3: restructor the code, move rcu_read_lock()/unlock() into the iterator, add dma_resv_iter_is_restarted() v4: fix NULL deref when no explicit fence exists, drop superflous rcu_read_lock()/unlock() calls. v5: fix typos in the documentation v6: fix coding error when excl fence is NULL Signed-off-by: Christian König <christian.koenig(a)amd.com> --- drivers/dma-buf/dma-resv.c | 98 ++++++++++++++++++++++++++++++++++++++ include/linux/dma-resv.h | 95 ++++++++++++++++++++++++++++++++++++ 2 files changed, 193 insertions(+) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 84fbe60629e3..97af397304f3 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -323,6 +323,104 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence) } EXPORT_SYMBOL(dma_resv_add_excl_fence); +/** + * dma_resv_iter_restart_unlocked - restart the unlocked iterator + * @cursor: The dma_resv_iter object to restart + * + * Restart the unlocked iteration by initializing the cursor object. + */ +static void dma_resv_iter_restart_unlocked(struct dma_resv_iter *cursor) +{ + cursor->seq = read_seqcount_begin(&cursor->obj->seq); + cursor->index = -1; + if (cursor->all_fences) + cursor->fences = dma_resv_shared_list(cursor->obj); + else + cursor->fences = NULL; + cursor->is_restarted = true; +} + +/** + * dma_resv_iter_walk_unlocked - walk over fences in a dma_resv obj + * @cursor: cursor to record the current position + * + * Return all the fences in the dma_resv object which are not yet signaled. + * The returned fence has an extra local reference so will stay alive. + * If a concurrent modify is detected the whole iteration is started over again. + */ +static void dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor) +{ + struct dma_resv *obj = cursor->obj; + + do { + /* Drop the reference from the previous round */ + dma_fence_put(cursor->fence); + + if (cursor->index == -1) { + cursor->fence = dma_resv_excl_fence(obj); + cursor->index++; + if (!cursor->fence) + continue; + + } else if (!cursor->fences || + cursor->index >= cursor->fences->shared_count) { + cursor->fence = NULL; + break; + + } else { + struct dma_resv_list *fences = cursor->fences; + unsigned int idx = cursor->index++; + + cursor->fence = rcu_dereference(fences->shared[idx]); + } + cursor->fence = dma_fence_get_rcu(cursor->fence); + } while (cursor->fence && dma_fence_is_signaled(cursor->fence)); +} + +/** + * dma_resv_iter_first_unlocked - first fence in an unlocked dma_resv obj. + * @cursor: the cursor with the current position + * + * Returns the first fence from an unlocked dma_resv obj. + */ +struct dma_fence *dma_resv_iter_first_unlocked(struct dma_resv_iter *cursor) +{ + rcu_read_lock(); + do { + dma_resv_iter_restart_unlocked(cursor); + dma_resv_iter_walk_unlocked(cursor); + } while (read_seqcount_retry(&cursor->obj->seq, cursor->seq)); + rcu_read_unlock(); + + return cursor->fence; +} +EXPORT_SYMBOL(dma_resv_iter_first_unlocked); + +/** + * dma_resv_iter_next_unlocked - next fence in an unlocked dma_resv obj. + * @cursor: the cursor with the current position + * + * Returns the next fence from an unlocked dma_resv obj. + */ +struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor) +{ + bool restart; + + rcu_read_lock(); + cursor->is_restarted = false; + restart = read_seqcount_retry(&cursor->obj->seq, cursor->seq); + do { + if (restart) + dma_resv_iter_restart_unlocked(cursor); + dma_resv_iter_walk_unlocked(cursor); + restart = true; + } while (read_seqcount_retry(&cursor->obj->seq, cursor->seq)); + rcu_read_unlock(); + + return cursor->fence; +} +EXPORT_SYMBOL(dma_resv_iter_next_unlocked); + /** * dma_resv_copy_fences - Copy all fences from src to dst. * @dst: the destination reservation object diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index 9100dd3dc21f..5d7d28cb9008 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -149,6 +149,101 @@ struct dma_resv { struct dma_resv_list __rcu *fence; }; +/** + * struct dma_resv_iter - current position into the dma_resv fences + * + * Don't touch this directly in the driver, use the accessor function instead. + */ +struct dma_resv_iter { + /** @obj: The dma_resv object we iterate over */ + struct dma_resv *obj; + + /** @all_fences: If all fences should be returned */ + bool all_fences; + + /** @fence: the currently handled fence */ + struct dma_fence *fence; + + /** @seq: sequence number to check for modifications */ + unsigned int seq; + + /** @index: index into the shared fences */ + unsigned int index; + + /** @fences: the shared fences */ + struct dma_resv_list *fences; + + /** @is_restarted: true if this is the first returned fence */ + bool is_restarted; +}; + +struct dma_fence *dma_resv_iter_first_unlocked(struct dma_resv_iter *cursor); +struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor); + +/** + * dma_resv_iter_begin - initialize a dma_resv_iter object + * @cursor: The dma_resv_iter object to initialize + * @obj: The dma_resv object which we want to iterate over + * @all_fences: If all fences should be returned or just the exclusive one + */ +static inline void dma_resv_iter_begin(struct dma_resv_iter *cursor, + struct dma_resv *obj, + bool all_fences) +{ + cursor->obj = obj; + cursor->all_fences = all_fences; + cursor->fence = NULL; +} + +/** + * dma_resv_iter_end - cleanup a dma_resv_iter object + * @cursor: the dma_resv_iter object which should be cleaned up + * + * Make sure that the reference to the fence in the cursor is properly + * dropped. + */ +static inline void dma_resv_iter_end(struct dma_resv_iter *cursor) +{ + dma_fence_put(cursor->fence); +} + +/** + * dma_resv_iter_is_exclusive - test if the current fence is the exclusive one + * @cursor: the cursor of the current position + * + * Returns true if the currently returned fence is the exclusive one. + */ +static inline bool dma_resv_iter_is_exclusive(struct dma_resv_iter *cursor) +{ + return cursor->index == -1; +} + +/** + * dma_resv_iter_is_restarted - test if this is the first fence after a restart + * @cursor: the cursor with the current position + * + * Return true if this is the first fence in an iteration after a restart. + */ +static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor) +{ + return cursor->is_restarted; +} + +/** + * dma_resv_for_each_fence_unlocked - unlocked fence iterator + * @cursor: a struct dma_resv_iter pointer + * @fence: the current fence + * + * Iterate over the fences in a struct dma_resv object without holding the + * &dma_resv.lock and using RCU instead. The cursor needs to be initialized + * with dma_resv_iter_begin() and cleaned up with dma_resv_iter_end(). Inside + * the iterator a reference to the dma_fence is held and the RCU lock dropped. + * When the dma_resv is modified the iteration starts over again. + */ +#define dma_resv_for_each_fence_unlocked(cursor, fence) \ + for (fence = dma_resv_iter_first_unlocked(cursor); \ + fence; fence = dma_resv_iter_next_unlocked(cursor)) + #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base) #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base) -- 2.25.1

3 years, 7 months

Re: [Linaro-mm-sig] [RFC PATCH 2/4] DRM: Add support of AI Processor Unit (APU)

by Christian König

Am 23.09.21 um 02:58 schrieb Dave Airlie: > On Sat, 18 Sept 2021 at 07:57, Alexandre Bailon <abailon(a)baylibre.com> wrote: >> Some Mediatek SoC provides hardware accelerator for AI / ML. >> This driver provides the infrastructure to manage memory >> shared between host CPU and the accelerator, and to submit >> jobs to the accelerator. >> The APU itself is managed by remoteproc so this drivers >> relies on remoteproc to found the APU and get some important data >> from it. But, the driver is quite generic and it should possible >> to manage accelerator using another ways. >> This driver doesn't manage itself the data transmitions. >> It must be registered by another driver implementing the transmitions. >> >> Signed-off-by: Alexandre Bailon <abailon(a)baylibre.com> >> [SNIP] >> Please refer to >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.kerne… >> >> here and below in many places. >> >> There's a lot of missing padding/alignment here. There is also the pahole utility which show you nicely where you need padding for your IOCTL structures. For example "pahole drivers/gpu/drm/amd/amdgpu/amdgpu.ko -C drm_amdgpu_gem_va" gives you: struct drm_amdgpu_gem_va { __u32 handle; /* 0 4 */ __u32 _pad; /* 4 4 */ __u32 operation; /* 8 4 */ __u32 flags; /* 12 4 */ __u64 va_address; /* 16 8 */ __u64 offset_in_bo; /* 24 8 */ __u64 map_size; /* 32 8 */ /* size: 40, cachelines: 1, members: 7 */ /* last cacheline: 40 bytes */ }; And as you can see we have added the _pad field to our IOCTL parameter structure to properly align the 64bit members. Regards, Christian. >> >> I'm trying to find the time to review this stack in full, any writeups >> on how this is used from userspace would be useful (not just the code >> repo, but some sort of how do I get at it) it reads as kinda generic >> (calling it apu), but then has some specifics around device binding. >> >> Dave.

3 years, 7 months

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