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PCI/ASPM: Remove struct aspm_register_info.l1ss_cap

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Previously we stored the L1SS Capabilities value in the struct
aspm_register_info.

We only need this information in one place, so read it there and remove
struct aspm_register_info completely, since it's now empty.  No functional
change intended.

[bhelgaas: split up, don't cache l1ss_cap in pci_dev]
Link: https://lore.kernel.org/r/20201015193039.12585-12-helgaas@kernel.org
Signed-off-by: Saheed O. Bolarinwa <refactormyself@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Saheed O. Bolarinwa 2020-10-15 14:30:38 -05:00 committed by Bjorn Helgaas
parent 1e8955fd83
commit 187f91db82
1 changed files with 21 additions and 32 deletions
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53
drivers/pci/pcie/aspm.c
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@ -382,26 +382,6 @@ static void encode_l12_threshold(u32 threshold_us, u32 *scale, u32 *value)
}
}
struct aspm_register_info {
/* L1 substates */
u32 l1ss_cap;
};
static void pcie_get_aspm_reg(struct pci_dev *pdev,
struct aspm_register_info *info)
{
/* Read L1 PM substate capabilities */
info->l1ss_cap = 0;
if (!pdev->l1ss)
return;
pci_read_config_dword(pdev, pdev->l1ss + PCI_L1SS_CAP,
&info->l1ss_cap);
if (!(info->l1ss_cap & PCI_L1SS_CAP_L1_PM_SS))
info->l1ss_cap = 0;
}
static void pcie_aspm_check_latency(struct pci_dev *endpoint)
{
u32 latency, l1_switch_latency = 0;
@ -527,9 +507,9 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
struct pci_dev *child = link->downstream, *parent = link->pdev;
u32 parent_lnkcap, child_lnkcap;
u16 parent_lnkctl, child_lnkctl;
u32 parent_l1ss_cap, child_l1ss_cap;
u32 parent_l1ss_ctl1 = 0, child_l1ss_ctl1 = 0;
struct pci_bus *linkbus = parent->subordinate;
struct aspm_register_info upreg, dwreg;
if (blacklist) {
/* Set enabled/disable so that we will disable ASPM later */
@ -560,8 +540,6 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
pcie_capability_read_dword(child, PCI_EXP_LNKCAP, &child_lnkcap);
pcie_capability_read_word(parent, PCI_EXP_LNKCTL, &parent_lnkctl);
pcie_capability_read_word(child, PCI_EXP_LNKCTL, &child_lnkctl);
pcie_get_aspm_reg(parent, &upreg);
pcie_get_aspm_reg(child, &dwreg);
/*
* Setup L0s state
@ -589,27 +567,38 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
link->latency_up.l1 = calc_l1_latency(parent_lnkcap);
link->latency_dw.l1 = calc_l1_latency(child_lnkcap);
/* Setup L1 substate
/* Setup L1 substate */
pci_read_config_dword(parent, parent->l1ss + PCI_L1SS_CAP,
&parent_l1ss_cap);
pci_read_config_dword(child, child->l1ss + PCI_L1SS_CAP,
&child_l1ss_cap);
if (!(parent_l1ss_cap & PCI_L1SS_CAP_L1_PM_SS))
parent_l1ss_cap = 0;
if (!(child_l1ss_cap & PCI_L1SS_CAP_L1_PM_SS))
child_l1ss_cap = 0;
/*
* If we don't have LTR for the entire path from the Root Complex
* to this device, we can't use ASPM L1.2 because it relies on the
* LTR_L1.2_THRESHOLD. See PCIe r4.0, secs 5.5.4, 6.18.
*/
if (!child->ltr_path)
dwreg.l1ss_cap &= ~PCI_L1SS_CAP_ASPM_L1_2;
child_l1ss_cap &= ~PCI_L1SS_CAP_ASPM_L1_2;
if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_ASPM_L1_1)
if (parent_l1ss_cap & child_l1ss_cap & PCI_L1SS_CAP_ASPM_L1_1)
link->aspm_support |= ASPM_STATE_L1_1;
if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_ASPM_L1_2)
if (parent_l1ss_cap & child_l1ss_cap & PCI_L1SS_CAP_ASPM_L1_2)
link->aspm_support |= ASPM_STATE_L1_2;
if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_1)
if (parent_l1ss_cap & child_l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_1)
link->aspm_support |= ASPM_STATE_L1_1_PCIPM;
if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_2)
if (parent_l1ss_cap & child_l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_2)
link->aspm_support |= ASPM_STATE_L1_2_PCIPM;
if (upreg.l1ss_cap)
if (parent_l1ss_cap)
pci_read_config_dword(parent, parent->l1ss + PCI_L1SS_CTL1,
&parent_l1ss_ctl1);
if (dwreg.l1ss_cap)
if (child_l1ss_cap)
pci_read_config_dword(child, child->l1ss + PCI_L1SS_CTL1,
&child_l1ss_ctl1);
@ -623,7 +612,7 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
link->aspm_enabled |= ASPM_STATE_L1_2_PCIPM;
if (link->aspm_support & ASPM_STATE_L1SS)
aspm_calc_l1ss_info(link, upreg.l1ss_cap, dwreg.l1ss_cap);
aspm_calc_l1ss_info(link, parent_l1ss_cap, child_l1ss_cap);
/* Save default state */
link->aspm_default = link->aspm_enabled;