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From: sathyanarayanan.kuppuswamy@linux.intel.com
To: bhelgaas@google.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	ashok.raj@intel.com, keith.busch@intel.com,
	sathyanarayanan.kuppuswamy@linux.intel.com,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>
Subject: [PATCH v5 3/9] PCI/ACPI: Expose EDR support via _OSC to BIOS
Date: Tue, 23 Jul 2019 13:21:45 -0700	[thread overview]
Message-ID: <c2841a077e304b3173e1c6f95f7fe488d1e15030.1563912591.git.sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <cover.1563912591.git.sathyanarayanan.kuppuswamy@linux.intel.com>

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

As per PCI firmware specification r3.2 Downstream Port Containment
Related Enhancements ECN, sec 4.5.1, table 4-4, if OS supports EDR,
it should expose its support to BIOS by setting bit 7 of _OSC Support
Field.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/acpi/pci_root.c | 3 +++
 include/linux/acpi.h    | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 73b08f40b0da..988d09d788b6 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -132,6 +132,7 @@ static struct pci_osc_bit_struct pci_osc_support_bit[] = {
 	{ OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
 	{ OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
 	{ OSC_PCI_MSI_SUPPORT, "MSI" },
+	{ OSC_PCI_EDR_SUPPORT, "EDR" },
 	{ OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
 };
 
@@ -442,6 +443,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
 		support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
 	if (pci_msi_enabled())
 		support |= OSC_PCI_MSI_SUPPORT;
+	if (IS_ENABLED(CONFIG_PCIE_EDR))
+		support |= OSC_PCI_EDR_SUPPORT;
 
 	decode_osc_support(root, "OS supports", support);
 	status = acpi_pci_osc_support(root, support);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 8959ed322e15..b6b43da85d26 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -515,6 +515,7 @@ extern bool osc_pc_lpi_support_confirmed;
 #define OSC_PCI_CLOCK_PM_SUPPORT		0x00000004
 #define OSC_PCI_SEGMENT_GROUPS_SUPPORT		0x00000008
 #define OSC_PCI_MSI_SUPPORT			0x00000010
+#define OSC_PCI_EDR_SUPPORT			0x00000080
 #define OSC_PCI_HPX_TYPE_3_SUPPORT		0x00000100
 #define OSC_PCI_SUPPORT_MASKS			0x0000011f
 
-- 
2.21.0


  parent reply	other threads:[~2019-07-23 20:25 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-23 20:21 [PATCH v5 0/9] Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2019-07-23 20:21 ` [PATCH v5 1/9] PCI/ERR: Update error status after reset_link() sathyanarayanan.kuppuswamy
2019-07-23 20:21 ` [PATCH v5 2/9] PCI/ACPI: Add _OSC based negotiation support for DPC sathyanarayanan.kuppuswamy
2019-07-23 20:21 ` sathyanarayanan.kuppuswamy [this message]
2019-07-23 20:21 ` [PATCH v5 4/9] PCI/DPC: Allow dpc_probe() even if firmware first mode is enabled sathyanarayanan.kuppuswamy
2019-07-23 20:21 ` [PATCH v5 5/9] PCI/DPC: Add dpc_process_error() wrapper function sathyanarayanan.kuppuswamy
2019-07-23 20:21 ` [PATCH v5 6/9] PCI/DPC: Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2019-07-23 20:21 ` [PATCH v5 7/9] PCI/AER: Allow clearing Error Status Register in FF mode sathyanarayanan.kuppuswamy
2019-07-23 20:21 ` [PATCH v5 8/9] PCI/DPC: Add support for DPC recovery on NON_FATAL errors sathyanarayanan.kuppuswamy
2019-07-25 16:50   ` Keith Busch
2019-07-26 20:54     ` sathyanarayanan kuppuswamy
2019-07-23 20:21 ` [PATCH v5 9/9] PCI/DPC: Clear AER registers in EDR mode sathyanarayanan.kuppuswamy

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