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Date: Wed, 26 Feb 2020 11:47:47 +0000
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: longli@...uxonhyperv.com
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Sasha Levin <sashal@...nel.org>,
Andrew Murray <andrew.murray@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, Long Li <longli@...rosoft.com>
Subject: Re: [Patch v5 1/2] PCI: hv: Decouple the func definition in
hv_dr_state from VSP message
On Tue, Feb 25, 2020 at 09:06:07PM -0800, longli@...uxonhyperv.com wrote:
> From: Long Li <longli@...rosoft.com>
>
> hv_dr_state is used to find present PCI devices on the bus. The structure
> reuses struct pci_function_description from VSP message to describe a
> device.
>
> To prepare support for pci_function_description v2, decouple this
> dependence in hv_dr_state so it can work with both v1 and v2 VSP messages.
>
> There is no functionality change.
>
> Signed-off-by: Long Li <longli@...rosoft.com>
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> ---
> Changes
> v2: Changed some spaces to tabs, changed failure code to -ENOMEM
> v3: Revised comment for function hv_pci_devices_present(), reformatted patch title
> v4: Fixed spelling
> v5: Rebased to current tree
>
> drivers/pci/controller/pci-hyperv.c | 100 +++++++++++++++++++++++++-----------
> 1 file changed, 70 insertions(+), 30 deletions(-)
Applied the series to pci/hv for v5.7.
Thanks,
Lorenzo
>
> index 15011a3..dea197f 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -505,10 +505,24 @@ struct hv_dr_work {
> struct hv_pcibus_device *bus;
> };
>
> +struct hv_pcidev_description {
> + u16 v_id; /* vendor ID */
> + u16 d_id; /* device ID */
> + u8 rev;
> + u8 prog_intf;
> + u8 subclass;
> + u8 base_class;
> + u32 subsystem_id;
> + union win_slot_encoding win_slot;
> + u32 ser; /* serial number */
> + u32 flags;
> + u16 virtual_numa_node;
> +};
> +
> struct hv_dr_state {
> struct list_head list_entry;
> u32 device_count;
> - struct pci_function_description func[0];
> + struct hv_pcidev_description func[0];
> };
>
> enum hv_pcichild_state {
> @@ -525,7 +539,7 @@ struct hv_pci_dev {
> refcount_t refs;
> enum hv_pcichild_state state;
> struct pci_slot *pci_slot;
> - struct pci_function_description desc;
> + struct hv_pcidev_description desc;
> bool reported_missing;
> struct hv_pcibus_device *hbus;
> struct work_struct wrk;
> @@ -1877,7 +1891,7 @@ static void q_resource_requirements(void *context, struct pci_response *resp,
> * Return: Pointer to the new tracking struct
> */
> static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus,
> - struct pci_function_description *desc)
> + struct hv_pcidev_description *desc)
> {
> struct hv_pci_dev *hpdev;
> struct pci_child_message *res_req;
> @@ -1988,7 +2002,7 @@ static void pci_devices_present_work(struct work_struct *work)
> {
> u32 child_no;
> bool found;
> - struct pci_function_description *new_desc;
> + struct hv_pcidev_description *new_desc;
> struct hv_pci_dev *hpdev;
> struct hv_pcibus_device *hbus;
> struct list_head removed;
> @@ -2107,17 +2121,15 @@ static void pci_devices_present_work(struct work_struct *work)
> }
>
> /**
> - * hv_pci_devices_present() - Handles list of new children
> + * hv_pci_start_relations_work() - Queue work to start device discovery
> * @hbus: Root PCI bus, as understood by this driver
> - * @relations: Packet from host listing children
> + * @dr: The list of children returned from host
> *
> - * This function is invoked whenever a new list of devices for
> - * this bus appears.
> + * Return: 0 on success, -errno on failure
> */
> -static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
> - struct pci_bus_relations *relations)
> +static int hv_pci_start_relations_work(struct hv_pcibus_device *hbus,
> + struct hv_dr_state *dr)
> {
> - struct hv_dr_state *dr;
> struct hv_dr_work *dr_wrk;
> unsigned long flags;
> bool pending_dr;
> @@ -2125,29 +2137,15 @@ static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
> if (hbus->state == hv_pcibus_removing) {
> dev_info(&hbus->hdev->device,
> "PCI VMBus BUS_RELATIONS: ignored\n");
> - return;
> + return -ENOENT;
> }
>
> dr_wrk = kzalloc(sizeof(*dr_wrk), GFP_NOWAIT);
> if (!dr_wrk)
> - return;
> -
> - dr = kzalloc(offsetof(struct hv_dr_state, func) +
> - (sizeof(struct pci_function_description) *
> - (relations->device_count)), GFP_NOWAIT);
> - if (!dr) {
> - kfree(dr_wrk);
> - return;
> - }
> + return -ENOMEM;
>
> INIT_WORK(&dr_wrk->wrk, pci_devices_present_work);
> dr_wrk->bus = hbus;
> - dr->device_count = relations->device_count;
> - if (dr->device_count != 0) {
> - memcpy(dr->func, relations->func,
> - sizeof(struct pci_function_description) *
> - dr->device_count);
> - }
>
> spin_lock_irqsave(&hbus->device_list_lock, flags);
> /*
> @@ -2165,6 +2163,47 @@ static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
> get_hvpcibus(hbus);
> queue_work(hbus->wq, &dr_wrk->wrk);
> }
> +
> + return 0;
> +}
> +
> +/**
> + * hv_pci_devices_present() - Handle list of new children
> + * @hbus: Root PCI bus, as understood by this driver
> + * @relations: Packet from host listing children
> + *
> + * Process a new list of devices on the bus. The list of devices is
> + * discovered by VSP and sent to us via VSP message PCI_BUS_RELATIONS,
> + * whenever a new list of devices for this bus appears.
> + */
> +static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
> + struct pci_bus_relations *relations)
> +{
> + struct hv_dr_state *dr;
> + int i;
> +
> + dr = kzalloc(offsetof(struct hv_dr_state, func) +
> + (sizeof(struct hv_pcidev_description) *
> + (relations->device_count)), GFP_NOWAIT);
> +
> + if (!dr)
> + return;
> +
> + dr->device_count = relations->device_count;
> + for (i = 0; i < dr->device_count; i++) {
> + dr->func[i].v_id = relations->func[i].v_id;
> + dr->func[i].d_id = relations->func[i].d_id;
> + dr->func[i].rev = relations->func[i].rev;
> + dr->func[i].prog_intf = relations->func[i].prog_intf;
> + dr->func[i].subclass = relations->func[i].subclass;
> + dr->func[i].base_class = relations->func[i].base_class;
> + dr->func[i].subsystem_id = relations->func[i].subsystem_id;
> + dr->func[i].win_slot = relations->func[i].win_slot;
> + dr->func[i].ser = relations->func[i].ser;
> + }
> +
> + if (hv_pci_start_relations_work(hbus, dr))
> + kfree(dr);
> }
>
> /**
> @@ -3069,7 +3108,7 @@ static int hv_pci_bus_exit(struct hv_device *hdev, bool hibernating)
> struct pci_packet teardown_packet;
> u8 buffer[sizeof(struct pci_message)];
> } pkt;
> - struct pci_bus_relations relations;
> + struct hv_dr_state *dr;
> struct hv_pci_compl comp_pkt;
> int ret;
>
> @@ -3082,8 +3121,9 @@ static int hv_pci_bus_exit(struct hv_device *hdev, bool hibernating)
>
> if (!hibernating) {
> /* Delete any children which might still exist. */
> - memset(&relations, 0, sizeof(relations));
> - hv_pci_devices_present(hbus, &relations);
> + dr = kzalloc(sizeof(*dr), GFP_KERNEL);
> + if (dr && hv_pci_start_relations_work(hbus, dr))
> + kfree(dr);
> }
>
> ret = hv_send_resources_released(hdev);
> --
> 1.8.3.1
>
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