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Message-ID: <BL0PR2101MB1123229A668A200C34A2888ECE3B0@BL0PR2101MB1123.namprd21.prod.outlook.com>
Date: Sat, 11 Jan 2020 08:27:25 +0000
From: Long Li <longli@...rosoft.com>
To: "longli@...uxonhyperv.com" <longli@...uxonhyperv.com>,
KY Srinivasan <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Sasha Levin <sashal@...nel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Andrew Murray <andrew.murray@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Patch v3 1/2] PCI: hv: Decouple the func definition in
hv_dr_state from VSP message
Hi Bjorn,
I have addressed all the prior comments in this v3 patch. Please take a look.
Thanks
Long
>Subject: [Patch v3 1/2] PCI: hv: Decouple the func definition in hv_dr_state from
>VSP message
>
>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, we need to 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>
>---
>Changes
>v2: changed some spaces to tabs, changed failure code to -ENOMEM
>v3: revised comment for function hv_pci_devices_present(), reformatted patch
>title
>
> drivers/pci/controller/pci-hyperv.c | 101 +++++++++++++++++++---------
> 1 file changed, 70 insertions(+), 31 deletions(-)
>
>diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-
>hyperv.c
>index f1f300218fab..4452c6bae6cf 100644
>--- a/drivers/pci/controller/pci-hyperv.c
>+++ b/drivers/pci/controller/pci-hyperv.c
>@@ -507,10 +507,24 @@ 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 {
>@@ -527,7 +541,7 @@ 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;
>@@ -1862,7 +1876,7 @@ 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;
>@@ -1973,7 +1987,7 @@ 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;
>@@ -2090,43 +2104,26 @@ static void pci_devices_present_work(struct
>work_struct *work)
> put_hvpcibus(hbus);
> kfree(dr);
> }
>-
> /**
>- * 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;
>+ unsigned long flags;
>
> 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);
> /*
>@@ -2144,6 +2141,47 @@ 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() - Handles list of new children
>+ * @hbus: Root PCI bus, as understood by this driver
>+ * @relations: Packet from host listing children
>+ *
>+ * This function processes a new list of devices on the bus. The list
>+of
>+ * devices is discoverd 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);
> }
>
> /**
>@@ -3018,7 +3056,7 @@ static void hv_pci_bus_exit(struct hv_device *hdev)
> 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;
>
>@@ -3030,8 +3068,9 @@ static void hv_pci_bus_exit(struct hv_device *hdev)
> return;
>
> /* 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);
> if (ret)
>--
>2.17.1
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