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HV: refine pci_lookup_drhd_for_pbdf with hash 

hv: pci: refine pci_lookup_drhd_for_pbdf with hash

1. Added an auxiliary function pci_find_pdev using hash to find pdev
with pbdf, thus pci_lookup_drhd_for_pbdf will have a 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 2020-06-05 12:17:59 +08:00 committed by wenlingz
parent f58bf1f03f
commit 8fb8d81935
2 changed files with 27 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
hypervisor/hw/pci.c
View File

@ -43,10 +43,16 @@
#include <bits.h>
#include <board.h>
#include <platform_acpi_info.h>
#include <hash.h>
#include <util.h>
#define PDEV_HLIST_HASHBITS 6U
#define PDEV_HLIST_HASHSIZE (1U << PDEV_HLIST_HASHBITS)
static spinlock_t pci_device_lock;
static uint32_t num_pci_pdev;
static struct pci_pdev pci_pdevs[CONFIG_MAX_PCI_DEV_NUM];
static struct hlist_head pdevs_hlist_heads[PDEV_HLIST_HASHSIZE];
static uint64_t pci_mmcfg_base = DEFAULT_PCI_MMCFG_BASE;
#ifdef CONFIG_ACPI_PARSE_ENABLED
@ -258,6 +264,21 @@ void pdev_restore_bar(const struct pci_pdev *pdev)
}
}
static const struct pci_pdev *pci_find_pdev(uint16_t pbdf)
{
struct hlist_node *n;
const struct pci_pdev *found = NULL, *tmp;
hlist_for_each (n, &pdevs_hlist_heads[hash64(pbdf, PDEV_HLIST_HASHBITS)]) {
tmp = hlist_entry(n, struct pci_pdev, link);
if (pbdf == tmp->bdf.value) {
found = tmp;
break;
}
}
return found;
}
/* @brief: Find the DRHD index corresponding to a PCI device
* Runs through the pci_pdevs and returns the value in drhd_idx
* member from pdev structure that matches matches B:D.F
@ -269,17 +290,8 @@ void pdev_restore_bar(const struct pci_pdev *pdev)
uint32_t pci_lookup_drhd_for_pbdf(uint16_t pbdf)
{
uint32_t drhd_index = INVALID_DRHD_INDEX;
uint32_t index;
for (index = 0U; index < num_pci_pdev; index++) {
if (pci_pdevs[index].bdf.value == pbdf) {
drhd_index = pci_pdevs[index].drhd_index;
break;
}
}
return drhd_index;
const struct pci_pdev *pdev = pci_find_pdev(pbdf);
return (pdev != NULL) ? pdev->drhd_index : INVALID_DRHD_INDEX;
}
/* enable: 1: enable INTx; 0: Disable INTx */
@ -765,6 +777,7 @@ struct pci_pdev *init_pdev(uint16_t pbdf, uint32_t drhd_index)
pci_enumerate_cap(pdev);
}
hlist_add_head(&pdev->link, &pdevs_hlist_heads[hash64(pbdf, PDEV_HLIST_HASHBITS)]);
pdev->drhd_index = drhd_index;
num_pci_pdev++;
reserve_vmsix_on_msi_irtes(pdev);

3
hypervisor/include/hw/pci.h
View File

@ -31,6 +31,8 @@
#ifndef PCI_H_
#define PCI_H_
#include <list.h>
/*
* PCIM_xxx: mask to locate subfield in register
* PCIR_xxx: config register offset
@ -248,6 +250,7 @@ struct pci_pdev {
bool has_pm_reset;
bool has_flr;
bool has_af_flr;
struct hlist_node link;
};
struct pci_cfg_ops {