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From: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
To: helgaas@kernel.org
Cc: "Saheed O. Bolarinwa" <refactormyself@gmail.com>,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: [Linux-kernel-mentees] [RFC PATCH v5 02/23] PCI: Add l1ss_cap and l1ss_cap_ptr to struct pci_dev
Date: Sat, 22 Aug 2020 22:03:37 +0200	[thread overview]
Message-ID: <20200822200358.252967-3-refactormyself@gmail.com> (raw)
In-Reply-To: <20200822200358.252967-1-refactormyself@gmail.com>

 - Add l1ss_cap and l1ss_cap_ptr to struct pci_dev
 - Compute the value of pci_dev.l1ss_cap and pci_dev.l1ss_cap_ptr

Signed-off-by: Saheed O. Bolarinwa <refactormyself@gmail.com>
---
 drivers/pci/probe.c | 6 ++++++
 include/linux/pci.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6cae7230f3b5..787ab6e831c7 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2101,6 +2101,12 @@ static void pci_configure_ltr(struct pci_dev *dev)
 	if (!pci_is_pcie(dev))
 		return;
 
+	/* Read L1 PM substate capabilities */
+	dev->l1ss_cap_ptr = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS);
+	if (dev->l1ss_cap_ptr)
+		pci_read_config_dword(dev, dev->l1ss_cap_ptr + PCI_L1SS_CAP,
+								&dev->l1ss_cap);
+
 	pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap);
 	if (!(cap & PCI_EXP_DEVCAP2_LTR))
 		return;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 3d30d3650ac9..fa114c5d01e7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -381,6 +381,8 @@ struct pci_dev {
 	struct pcie_link_state	*link_state;	/* ASPM link state */
 	unsigned int	ltr_path:1;	/* Latency Tolerance Reporting
 					   supported from root to here */
+	int		l1ss_cap_ptr;	/* L1SS cap ptr, 0 if not supported */
+	u32		l1ss_cap;	/* L1 PM substate Capabilities */
 #endif
 	unsigned int	eetlp_prefix_path:1;	/* End-to-End TLP Prefix */
 
-- 
2.18.4

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  parent reply	other threads:[~2020-08-22 21:03 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-22 20:03 [Linux-kernel-mentees] [RFC PATCH v5 00/23] Remove struct pcie_link_state and aspm_register_info Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 01/23] PCI: Migrate ASPM info from struct pcie_link_state to struct pci_dev Saheed O. Bolarinwa
2020-08-22 20:03 ` Saheed O. Bolarinwa [this message]
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 03/23] PCI: Rework calc_l*_latency() to take a pci_dev * Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 04/23] PCI: Compute aspm_register_info.support directly Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 05/23] PCI: Read value of aspm_register_info.l1ss_ctl1 directly Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 06/23] PCI: Replace aspm_register_info.l1ss_cap* with their pci_dev version Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 07/23] PCI: Compute aspm_register_info.enable directly Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 08/23] PCI: Remove unused aspm_calc_l1ss_info() arguments Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 09/23] PCI: Remove pcie_get_aspm_reg() and struct aspm_register_info Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 10/23] PCI: Relocate call to aspm_calc_l1ss_info Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 11/23] PCI: Rework and Rename aspm_calc_l1ss_info() Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 12/23] PCI: Add ASPM and CLOCK PM states to struct pci_dev Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 13/23] PCI: Initialise and Update values of pci_dev's PCIe link info Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 14/23] PCI: Change Return and Argument values from pcie_link_state to pci_dev Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 15/23] PCI: Replace pcie_link_state based device list with a pci_dev one Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 16/23] PCI: Remove Exit latencies from struct pcie_link_state Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 17/23] PCI: Remove .clkpm_* " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 18/23] PCI: Remove .aspm_* " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 19/23] PCI: Remove .parent " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 20/23] PCI: Remove .root " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 21/23] PCI: Remove .downstream " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 22/23] PCI: Remove .pdev " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 23/23] PCI: Remove " Saheed O. Bolarinwa

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