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Here is a failed example on ASUS B1400CEAE: Capabilities: [900 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- L1_PM_Sub= states+ PortCommonModeRestoreTime=3D32us PortTPowerOnTime=3D10us L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- T_CommonMode=3D0us LTR1.2_Threshold=3D0ns L1SubCtl2: T_PwrOn=3D10us Power on all of the VMD remapped PCI devices to D0 before enable PCI-PM L1 PM Substates by following "PCIe r6.0, sec 5.5.4". Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D218394 Signed-off-by: Jian-Hong Pan Reviewed-by: Kuppuswamy Sathyanarayanan --- v2: - Power on the VMD remapped devices with pci_set_power_state_locked() - Prepare the PCIe LTR parameters before enable L1 Substates - Add note into the comments of both pci_enable_link_state() and pci_enable_link_state_locked() for kernel-doc. - The original patch set can be split as individual patches. v3: - Re-send for the missed version information. - Split drivers/pci/pcie/aspm.c modification into following patches. - Fix the comment for enasuring the PCI devices in D0. v4: - The same v5: - Tweak the commit title and message - Change the goto label from out_enable_link_state to out_state_change v6~8: - The same drivers/pci/controller/vmd.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index a726de0af011..d021129d661c 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -751,11 +751,9 @@ static int vmd_pm_enable_quirk(struct pci_dev *pdev, v= oid *userdata) if (!(features & VMD_FEAT_BIOS_PM_QUIRK)) return 0; =20 - pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL); - pos =3D pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_LTR); if (!pos) - return 0; + goto out_state_change; =20 /* * Skip if the max snoop LTR is non-zero, indicating BIOS has set it @@ -763,7 +761,7 @@ static int vmd_pm_enable_quirk(struct pci_dev *pdev, vo= id *userdata) */ pci_read_config_dword(pdev, pos + PCI_LTR_MAX_SNOOP_LAT, <r_reg); if (!!(ltr_reg & (PCI_LTR_VALUE_MASK | PCI_LTR_SCALE_MASK))) - return 0; + goto out_state_change; =20 /* * Set the default values to the maximum required by the platform to @@ -775,6 +773,13 @@ static int vmd_pm_enable_quirk(struct pci_dev *pdev, v= oid *userdata) pci_write_config_dword(pdev, pos + PCI_LTR_MAX_SNOOP_LAT, ltr_reg); pci_info(pdev, "VMD: Default LTR value set by driver\n"); =20 +out_state_change: + /* + * Ensure devices are in D0 before enabling PCI-PM L1 PM Substates, per + * PCIe r6.0, sec 5.5.4. + */ + pci_set_power_state_locked(pdev, PCI_D0); + pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL); 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charset="utf-8" According to "PCIe r6.0, sec 5.5.4", add note about D0 requirement in pci_enable_link_state() kernel-doc. Signed-off-by: Jian-Hong Pan Acked-by: Bjorn Helgaas Reviewed-by: Kuppuswamy Sathyanarayanan --- v3: - Fix as readable comments v4: - The same v5: - Tweak and simplify the commit message v6~8: - The same drivers/pci/pcie/aspm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index cee2365e54b8..bd0a8a05647e 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1442,6 +1442,9 @@ static int __pci_enable_link_state(struct pci_dev *pd= ev, int state, bool locked) * touch the LNKCTL register. Also note that this does not enable states * disabled by pci_disable_link_state(). Return 0 or a negative errno. * + * Note: Ensure devices are in D0 before enabling PCI-PM L1 PM Substates, = per + * PCIe r6.0, sec 5.5.4. + * * @pdev: PCI device * @state: Mask of ASPM link states to enable */ @@ -1458,6 +1461,9 @@ EXPORT_SYMBOL(pci_enable_link_state); * can't touch the LNKCTL register. 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Fri, 19 Jul 2024 01:00:54 -0700 (PDT) From: Jian-Hong Pan To: Bjorn Helgaas Cc: Johan Hovold , David Box , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Kuppuswamy Sathyanarayanan , Mika Westerberg , Damien Le Moal , Nirmal Patel , Jonathan Derrick , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux@endlessos.org, Jian-Hong Pan Subject: [PATCH v8 3/4] PCI/ASPM: Introduce aspm_get_l1ss_cap() Date: Fri, 19 Jul 2024 15:59:35 +0800 Message-ID: <20240719075934.10950-2-jhp@endlessos.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240719075200.10717-2-jhp@endlessos.org> References: <20240719075200.10717-2-jhp@endlessos.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce aspm_get_l1ss_cap() which is extracted from aspm_l1ss_init() to get the PCIe's L1SS capability. This does not change any behavior, but aspm_get_l1ss_cap() can be reused later. Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D218394 Signed-off-by: Jian-Hong Pan Reviewed-by: David E. Box --- v6: - Skipped v7: - Pick back v8: - The same drivers/pci/pcie/aspm.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index bd0a8a05647e..5db1044c9895 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -611,6 +611,18 @@ static void pcie_aspm_check_latency(struct pci_dev *en= dpoint) } } =20 +static u32 aspm_get_l1ss_cap(struct pci_dev *pdev) +{ + u32 l1ss_cap; + + pci_read_config_dword(pdev, pdev->l1ss + PCI_L1SS_CAP, &l1ss_cap); + + if (!(l1ss_cap & PCI_L1SS_CAP_L1_PM_SS)) + l1ss_cap =3D 0; + + return l1ss_cap; +} + /* Calculate L1.2 PM substate timing parameters */ static void aspm_calc_l12_info(struct pcie_link_state *link, u32 parent_l1ss_cap, u32 child_l1ss_cap) @@ -721,15 +733,8 @@ static void aspm_l1ss_init(struct pcie_link_state *lin= k) return; =20 /* 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); 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Fri, 19 Jul 2024 01:04:11 -0700 (PDT) From: Jian-Hong Pan To: Bjorn Helgaas Cc: Johan Hovold , David Box , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Kuppuswamy Sathyanarayanan , Mika Westerberg , Damien Le Moal , Nirmal Patel , Jonathan Derrick , Paul M Stillwell Jr , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux@endlessos.org, Jian-Hong Pan Subject: [PATCH v8 4/4] PCI/ASPM: Fix L1.2 parameters when enable link state Date: Fri, 19 Jul 2024 16:02:56 +0800 Message-ID: <20240719080255.10998-2-jhp@endlessos.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240719075200.10717-2-jhp@endlessos.org> References: <20240719075200.10717-2-jhp@endlessos.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently, when enable link's L1.2 features with __pci_enable_link_state(), it configs the link directly without ensuring related L1.2 parameters, such as T_POWER_ON, Common_Mode_Restore_Time, and LTR_L1.2_THRESHOLD have been programmed. This leads the link's L1.2 between PCIe Root Port and child device gets wrong configs when a caller tries to enabled it. Here is a failed example on ASUS B1400CEAE with enabled VMD: 10000:e0:06.0 PCI bridge: Intel Corporation 11th Gen Core Processor PCIe Co= ntroller (rev 01) (prog-if 00 [Normal decode]) ... Capabilities: [200 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Sub= states+ PortCommonModeRestoreTime=3D45us PortTPowerOnTime=3D50us L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- T_CommonMode=3D45us LTR1.2_Threshold=3D101376ns L1SubCtl2: T_PwrOn=3D50us 10000:e1:00.0 Non-Volatile memory controller: Sandisk Corp WD Blue SN550 NV= Me SSD (rev 01) (prog-if 02 [NVM Express]) ... Capabilities: [900 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- L1_PM_Sub= states+ PortCommonModeRestoreTime=3D32us PortTPowerOnTime=3D10us L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- T_CommonMode=3D0us LTR1.2_Threshold=3D0ns L1SubCtl2: T_PwrOn=3D10us According to "PCIe r6.0, sec 5.5.4", before enabling ASPM L1.2 on the PCIe Root Port and the child NVMe, they should be programmed with the same LTR1.2_Threshold value. However, they have different values in this case. Invoke aspm_calc_l12_info() to program the L1.2 parameters properly before enable L1.2 bits of L1 PM Substates Control Register in __pci_enable_link_state(). Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D218394 Signed-off-by: Jian-Hong Pan --- v2: - Prepare the PCIe LTR parameters before enable L1 Substates v3: - Only enable supported features for the L1 Substates part v4: - Focus on fixing L1.2 parameters, instead of re-initializing whole L1SS v5: - Fix typo and commit message - Split introducing aspm_get_l1ss_cap() to "PCI/ASPM: Introduce aspm_get_l1ss_cap()" v6: - Skipped v7: - Pick back and rebase on the new version kernel - Drop the link state flag check. And, always config link state's timing parameters v8: - Because pcie_aspm_get_link() might return the link as NULL, move getting the link's parent and child devices after check the link is not NULL. This avoids NULL memory access. drivers/pci/pcie/aspm.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 5db1044c9895..55ff1d26fcea 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1411,9 +1411,15 @@ EXPORT_SYMBOL(pci_disable_link_state); static int __pci_enable_link_state(struct pci_dev *pdev, int state, bool l= ocked) { struct pcie_link_state *link =3D pcie_aspm_get_link(pdev); + u32 parent_l1ss_cap, child_l1ss_cap; + struct pci_dev *parent, *child; =20 if (!link) return -EINVAL; + + parent =3D link->pdev; + child =3D link->downstream; + /* * A driver requested that ASPM be enabled on this device, but * if we don't have permission to manage ASPM (e.g., on ACPI @@ -1428,6 +1434,15 @@ static int __pci_enable_link_state(struct pci_dev *p= dev, int state, bool locked) if (!locked) down_read(&pci_bus_sem); mutex_lock(&aspm_lock); + /* + * Ensure L1.2 parameters: Common_Mode_Restore_Times, T_POWER_ON and + * LTR_L1.2_THRESHOLD are programmed properly before enable bits for + * L1.2, per PCIe r6.0, sec 5.5.4. + */ + parent_l1ss_cap =3D aspm_get_l1ss_cap(parent); + child_l1ss_cap =3D aspm_get_l1ss_cap(child); + aspm_calc_l12_info(link, parent_l1ss_cap, child_l1ss_cap); + link->aspm_default =3D pci_calc_aspm_enable_mask(state); pcie_config_aspm_link(link, policy_to_aspm_state(link)); =20 --=20 2.45.2