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HV: refine pci_find_vdev with hash

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hv: pci: refine pci_find_vdev with hash

1. Refined pci_find_vdev with BDF-hashing for better performance

Tracked-On: #4857
Signed-off-by: Wang Qian <qian1.wang@intel.com>
Reviewed-by: Li Fei <Fei1.Li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Qian Wang 2020-06-16 11:34:03 +08:00 committed by wenlingz
parent 8fb8d81935
commit 882c9d5d76
3 changed files with 16 additions and 7 deletions
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13
hypervisor/dm/vpci/vdev.c
View File

@ -31,6 +31,7 @@
#include "vpci_priv.h"
#include <ept.h>
#include <logmsg.h>
#include <hash.h>
/**
* @pre vdev != NULL
@ -78,14 +79,12 @@ void pci_vdev_write_vcfg(struct pci_vdev *vdev, uint32_t offset, uint32_t bytes,
*/
struct pci_vdev *pci_find_vdev(struct acrn_vpci *vpci, union pci_bdf vbdf)
{
struct pci_vdev *vdev, *tmp;
uint32_t i;
struct pci_vdev *vdev = NULL, *tmp;
struct hlist_node *n;
vdev = NULL;
for (i = 0U; i < vpci->pci_vdev_cnt; i++) {
tmp = &(vpci->pci_vdevs[i]);
if (bdf_is_equal(tmp->bdf, vbdf)) {
hlist_for_each(n, &vpci->vdevs_hlist_heads[hash64(vbdf.value, VDEV_LIST_HASHBITS)]) {
tmp = hlist_entry(n, struct pci_vdev, link);
if (bdf_is_equal(vbdf, tmp->bdf)) {
vdev = tmp;
break;
}

5
hypervisor/dm/vpci/vpci.c
View File

@ -37,6 +37,7 @@
#include <logmsg.h>
#include "vpci_priv.h"
#include "pci_dev.h"
#include <hash.h>
static void vpci_init_vdevs(struct acrn_vm *vm);
static int32_t vpci_read_cfg(struct acrn_vpci *vpci, union pci_bdf bdf, uint32_t offset, uint32_t bytes, uint32_t *val);
@ -627,6 +628,7 @@ struct pci_vdev *vpci_init_vdev(struct acrn_vpci *vpci, struct acrn_vm_pci_dev_c
vdev->pci_dev_config = dev_config;
vdev->phyfun = parent_pf_vdev;
hlist_add_head(&vdev->link, &vpci->vdevs_hlist_heads[hash64(dev_config->vbdf.value, VDEV_LIST_HASHBITS)]);
if (dev_config->vdev_ops != NULL) {
vdev->vdev_ops = dev_config->vdev_ops;
} else {
@ -726,6 +728,9 @@ int32_t vpci_assign_pcidev(struct acrn_vm *tgt_vm, struct acrn_assign_pcidev *pc
vdev->flags |= pcidev->type;
vdev->bdf.value = pcidev->virt_bdf;
/*We should re-add the vdev to hashlist since its vbdf has changed */
hlist_del(&vdev->link);
hlist_add_head(&vdev->link, &vpci->vdevs_hlist_heads[hash64(vdev->bdf.value, VDEV_LIST_HASHBITS)]);
vdev->parent_user = vdev_in_sos;
spinlock_release(&tgt_vm->vpci.lock);
vdev_in_sos->user = vdev;

5
hypervisor/include/dm/vpci.h
View File

@ -32,7 +32,10 @@
#include <spinlock.h>
#include <pci.h>
#include <list.h>
#define VDEV_LIST_HASHBITS 4U
#define VDEV_LIST_HASHSIZE (1U << VDEV_LIST_HASHBITS)
struct pci_vbar {
enum pci_bar_type type;
@ -135,6 +138,7 @@ struct pci_vdev {
*/
struct pci_vdev *parent_user;
struct pci_vdev *user;
struct hlist_node link;
};
union pci_cfg_addr_reg {
@ -153,6 +157,7 @@ struct acrn_vpci {
uint64_t pci_mmcfg_base;
uint32_t pci_vdev_cnt;
struct pci_vdev pci_vdevs[CONFIG_MAX_PCI_DEV_NUM];
struct hlist_head vdevs_hlist_heads [VDEV_LIST_HASHSIZE];
};
struct acrn_vm;