[PATCH V7 0/4] Add loadable kernel module and power management support

[PATCH V7 0/4] Add loadable kernel module and power management support

[Manikanta Maddireddy]

This series of patches adds loadable kernel module and power management
support to Tegra PCIe host controller driver. irq_set_msi_desc() and
tegra_cpuidle_pcie_irqs_in_use() symbols will be taken care in next
set of patches.

These patches are tested on Jetson TK1, TX1 and TX2 platforms, following
are the verification details.
	- Multiple module insert & remove
	- PCIe device functionality after module insert
	- Free clock, resets, regulators, powergate, iomem and interrupt
	resources after module remove
	- PCIe device functionality after resume from RAM

V2: PM QoS fix is dropped in V2 from this series because the fix is
incorporated in latest 'commit 0759e80b84e3 ("PM / QoS: Fix device resume
latency framework")'. Update commit message of few patches in V2.

V3: Patches to export irq_set_msi_desc() and tegra_cpuidle_pcie_irqs_in_use()
are dropped based on review comments. These symbols will be addressed in next
series. Took care of few other review comments.

V4: Dropped pci_find_host_bridge() export patch and added new patch to use
bus->sysdata for private data.

V5: Decouple from https://patchwork.ozlabs.org/patch/832053/ and rebase
on top of linux-next

V6: Rebased on lpieralisi/pci/tegra branch

V7: Addressed comments on patch: 6 and 7 in V6
Limiting this series to linux-tegra & linux-pci since patches for other 
subsystem are merged or dropped

Manikanta Maddireddy (4):
  PCI: tegra: Free resources on probe failure
  PCI: tegra: Add loadable kernel module support
  PCI: tegra: Broadcast PME_Turn_Off message before link goes to L2
  PCI: tegra: Add power management support

 drivers/pci/host/Kconfig     |   2 +-
 drivers/pci/host/pci-tegra.c | 347 +++++++++++++++++++++++++++++++++----------
 2 files changed, 272 insertions(+), 77 deletions(-)

-- 
2.1.4

[PATCH V7 1/4] PCI: tegra: Free resources on probe failure

[Manikanta Maddireddy]

tegra_pcie_probe() can fail in multiple instances, this patch takes care
of freeing the resources which are allocated before probe fail.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
---
V2:
* no change in this patch
V3:
* change 'if check' to 'legacy_phy is true' for tegra_pcie_phys_put_legacy()
* commit log correction
V4:
* no change in this patch
V5:
* Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
rebased on linux-next
V6:
* no change in this patch
V7:
* no change in this patch

 drivers/pci/host/pci-tegra.c | 99 +++++++++++++++++++++++++++++++++++---------
 1 file changed, 79 insertions(+), 20 deletions(-)

diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index e4b47ebc91fe..e68507f658d8 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -562,14 +562,25 @@ static int tegra_pcie_request_resources(struct tegra_pcie *pcie)
 	pci_add_resource(windows, &pcie->busn);
 
 	err = devm_request_pci_bus_resources(dev, windows);
-	if (err < 0)
+	if (err < 0) {
+		pci_free_resource_list(windows);
 		return err;
+	}
 
 	pci_remap_iospace(&pcie->pio, pcie->io.start);
 
 	return 0;
 }
 
+static void tegra_pcie_free_resources(struct tegra_pcie *pcie)
+{
+	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+	struct list_head *windows = &host->windows;
+
+	pci_unmap_iospace(&pcie->pio);
+	pci_free_resource_list(windows);
+}
+
 static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
 {
 	struct tegra_pcie *pcie = pdev->bus->sysdata;
@@ -979,24 +990,35 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
 	return 0;
 }
 
-static void tegra_pcie_power_off(struct tegra_pcie *pcie)
+static void tegra_pcie_disable_controller(struct tegra_pcie *pcie)
 {
-	struct device *dev = pcie->dev;
-	const struct tegra_pcie_soc *soc = pcie->soc;
 	int err;
 
-	/* TODO: disable and unprepare clocks? */
+	reset_control_assert(pcie->pcie_xrst);
 
-	if (soc->program_uphy) {
+	if (pcie->soc->program_uphy) {
 		err = tegra_pcie_phy_power_off(pcie);
 		if (err < 0)
-			dev_err(dev, "failed to power off PHY(s): %d\n", err);
+			dev_err(pcie->dev, "failed to power off PHY(s): %d\n",
+				err);
 	}
+}
+
+static void tegra_pcie_power_off(struct tegra_pcie *pcie)
+{
+	struct device *dev = pcie->dev;
+	const struct tegra_pcie_soc *soc = pcie->soc;
+	int err;
 
-	reset_control_assert(pcie->pcie_xrst);
 	reset_control_assert(pcie->afi_rst);
 	reset_control_assert(pcie->pex_rst);
 
+	clk_disable_unprepare(pcie->pll_e);
+	if (soc->has_cml_clk)
+		clk_disable_unprepare(pcie->cml_clk);
+	clk_disable_unprepare(pcie->afi_clk);
+	clk_disable_unprepare(pcie->pex_clk);
+
 	if (!dev->pm_domain)
 		tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
 
@@ -1205,6 +1227,30 @@ static int tegra_pcie_phys_get(struct tegra_pcie *pcie)
 	return 0;
 }
 
+static void tegra_pcie_phys_put(struct tegra_pcie *pcie)
+{
+	struct tegra_pcie_port *port;
+	struct device *dev = pcie->dev;
+	int err, i;
+
+	if (pcie->legacy_phy) {
+		err = phy_exit(pcie->phy);
+		if (err < 0)
+			dev_err(dev, "failed to teardown PHY: %d\n", err);
+		return;
+	}
+
+	list_for_each_entry(port, &pcie->ports, list) {
+		for (i = 0; i < port->lanes; i++) {
+			err = phy_exit(port->phys[i]);
+			if (err < 0)
+				dev_err(dev, "failed to teardown PHY#%u: %d\n",
+					i, err);
+		}
+	}
+}
+
+
 static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
@@ -1236,7 +1282,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 	err = tegra_pcie_power_on(pcie);
 	if (err) {
 		dev_err(dev, "failed to power up: %d\n", err);
-		return err;
+		goto phys_put;
 	}
 
 	pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");
@@ -1288,6 +1334,9 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 
 	return 0;
 
+phys_put:
+	if (soc->program_uphy)
+		tegra_pcie_phys_put(pcie);
 poweroff:
 	tegra_pcie_power_off(pcie);
 	return err;
@@ -1295,20 +1344,15 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 
 static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
 {
-	struct device *dev = pcie->dev;
 	const struct tegra_pcie_soc *soc = pcie->soc;
-	int err;
 
 	if (pcie->irq > 0)
 		free_irq(pcie->irq, pcie);
 
 	tegra_pcie_power_off(pcie);
 
-	if (soc->program_uphy) {
-		err = phy_exit(pcie->phy);
-		if (err < 0)
-			dev_err(dev, "failed to teardown PHY: %d\n", err);
-	}
+	if (soc->program_uphy)
+		tegra_pcie_phys_put(pcie);
 
 	return 0;
 }
@@ -2048,6 +2092,16 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie)
 	}
 }
 
+static void tegra_pcie_disable_ports(struct tegra_pcie *pcie)
+{
+	struct tegra_pcie_port *port, *tmp;
+
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+		tegra_pcie_port_disable(port);
+		tegra_pcie_port_free(port);
+	}
+}
+
 static const struct tegra_pcie_soc tegra20_pcie = {
 	.num_ports = 2,
 	.msi_base_shift = 0,
@@ -2278,7 +2332,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 
 	err = tegra_pcie_request_resources(pcie);
 	if (err)
-		goto put_resources;
+		goto disable_controller;
 
 	/* setup the AFI address translations */
 	tegra_pcie_setup_translations(pcie);
@@ -2287,7 +2341,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 		err = tegra_pcie_enable_msi(pcie);
 		if (err < 0) {
 			dev_err(dev, "failed to enable MSI support: %d\n", err);
-			goto put_resources;
+			goto free_resources;
 		}
 	}
 
@@ -2302,7 +2356,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 	err = pci_scan_root_bus_bridge(host);
 	if (err < 0) {
 		dev_err(dev, "failed to register host: %d\n", err);
-		goto disable_msi;
+		goto disable_ports;
 	}
 
 	pci_bus_size_bridges(host->bus);
@@ -2321,9 +2375,14 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 
 	return 0;
 
-disable_msi:
+disable_ports:
+	tegra_pcie_disable_ports(pcie);
 	if (IS_ENABLED(CONFIG_PCI_MSI))
 		tegra_pcie_disable_msi(pcie);
+free_resources:
+	tegra_pcie_free_resources(pcie);
+disable_controller:
+	tegra_pcie_disable_controller(pcie);
 put_resources:
 	tegra_pcie_put_resources(pcie);
 	return err;
-- 
2.1.4

[PATCH V7 2/4] PCI: tegra: Add loadable kernel module support

[Manikanta Maddireddy]

Implement remove callback function for Tegra PCIe driver to add
loadable kernel module support. Change PCI_TEGRA config to tristate to
allow pci-tegra driver to be build as a module.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
---
V2:
* no change in this patch
V3:
* use tegra_pcie_debugfs_exit() helper function in tegra_pcie_debugfs_init()
V4:
* no change in this patch
V5:
* Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
rebased on linux-next
V6:
* no change in this patch
V7:
* no change in this patch

 drivers/pci/host/Kconfig     |  2 +-
 drivers/pci/host/pci-tegra.c | 34 +++++++++++++++++++++++++++++++---
 2 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 38d12980db0f..6fd2a5937804 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -34,7 +34,7 @@ config PCI_FTPCI100
 	default ARCH_GEMINI
 
 config PCI_TEGRA
-	bool "NVIDIA Tegra PCIe controller"
+	tristate "NVIDIA Tegra PCIe controller"
 	depends on ARCH_TEGRA
 	help
 	  Say Y here if you want support for the PCIe host controller found
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index e68507f658d8..981f126b14d6 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -35,6 +35,7 @@
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/module.h>
 #include <linux/msi.h>
 #include <linux/of_address.h>
 #include <linux/of_pci.h>
@@ -2276,6 +2277,12 @@ static const struct file_operations tegra_pcie_ports_ops = {
 	.release = seq_release,
 };
 
+static void tegra_pcie_debugfs_exit(struct tegra_pcie *pcie)
+{
+	debugfs_remove_recursive(pcie->debugfs);
+	pcie->debugfs = NULL;
+}
+
 static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
 {
 	struct dentry *file;
@@ -2292,8 +2299,7 @@ static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
 	return 0;
 
 remove:
-	debugfs_remove_recursive(pcie->debugfs);
-	pcie->debugfs = NULL;
+	tegra_pcie_debugfs_exit(pcie);
 	return -ENOMEM;
 }
 
@@ -2311,6 +2317,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 
 	pcie = pci_host_bridge_priv(host);
 	host->sysdata = pcie;
+	platform_set_drvdata(pdev, pcie);
 
 	pcie->soc = of_device_get_match_data(dev);
 	INIT_LIST_HEAD(&pcie->ports);
@@ -2388,6 +2395,25 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 	return err;
 }
 
+static int tegra_pcie_remove(struct platform_device *pdev)
+{
+	struct tegra_pcie *pcie = platform_get_drvdata(pdev);
+	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+
+	if (IS_ENABLED(CONFIG_DEBUG_FS))
+		tegra_pcie_debugfs_exit(pcie);
+	pci_stop_root_bus(host->bus);
+	pci_remove_root_bus(host->bus);
+	tegra_pcie_disable_ports(pcie);
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		tegra_pcie_disable_msi(pcie);
+	tegra_pcie_free_resources(pcie);
+	tegra_pcie_disable_controller(pcie);
+	tegra_pcie_put_resources(pcie);
+
+	return 0;
+}
+
 static struct platform_driver tegra_pcie_driver = {
 	.driver = {
 		.name = "tegra-pcie",
@@ -2395,5 +2421,7 @@ static struct platform_driver tegra_pcie_driver = {
 		.suppress_bind_attrs = true,
 	},
 	.probe = tegra_pcie_probe,
+	.remove = tegra_pcie_remove,
 };
-builtin_platform_driver(tegra_pcie_driver);
+module_platform_driver(tegra_pcie_driver);
+MODULE_LICENSE("GPL");
-- 
2.1.4

Re: [PATCH V7 2/4] PCI: tegra: Add loadable kernel module support

[Thierry Reding]

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On Tue, Jan 30, 2018 at 10:54:09AM +0530, Manikanta Maddireddy wrote:
> Implement remove callback function for Tegra PCIe driver to add
> loadable kernel module support. Change PCI_TEGRA config to tristate to
> allow pci-tegra driver to be build as a module.
> 
> Signed-off-by: Manikanta Maddireddy <mmaddireddy-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> Acked-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
> V2:
> * no change in this patch
> V3:
> * use tegra_pcie_debugfs_exit() helper function in tegra_pcie_debugfs_init()
> V4:
> * no change in this patch
> V5:
> * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
> rebased on linux-next
> V6:
> * no change in this patch
> V7:
> * no change in this patch
> 
>  drivers/pci/host/Kconfig     |  2 +-
>  drivers/pci/host/pci-tegra.c | 34 +++++++++++++++++++++++++++++++---
>  2 files changed, 32 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index 38d12980db0f..6fd2a5937804 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -34,7 +34,7 @@ config PCI_FTPCI100
>  	default ARCH_GEMINI
>  
>  config PCI_TEGRA
> -	bool "NVIDIA Tegra PCIe controller"
> +	tristate "NVIDIA Tegra PCIe controller"
>  	depends on ARCH_TEGRA
>  	help
>  	  Say Y here if you want support for the PCIe host controller found
> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
> index e68507f658d8..981f126b14d6 100644
> --- a/drivers/pci/host/pci-tegra.c
> +++ b/drivers/pci/host/pci-tegra.c
> @@ -35,6 +35,7 @@
>  #include <linux/irqdomain.h>
>  #include <linux/kernel.h>
>  #include <linux/init.h>
> +#include <linux/module.h>
>  #include <linux/msi.h>
>  #include <linux/of_address.h>
>  #include <linux/of_pci.h>
> @@ -2276,6 +2277,12 @@ static const struct file_operations tegra_pcie_ports_ops = {
>  	.release = seq_release,
>  };
>  
> +static void tegra_pcie_debugfs_exit(struct tegra_pcie *pcie)
> +{
> +	debugfs_remove_recursive(pcie->debugfs);
> +	pcie->debugfs = NULL;
> +}
> +
>  static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
>  {
>  	struct dentry *file;
> @@ -2292,8 +2299,7 @@ static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
>  	return 0;
>  
>  remove:
> -	debugfs_remove_recursive(pcie->debugfs);
> -	pcie->debugfs = NULL;
> +	tegra_pcie_debugfs_exit(pcie);
>  	return -ENOMEM;
>  }
>  
> @@ -2311,6 +2317,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>  
>  	pcie = pci_host_bridge_priv(host);
>  	host->sysdata = pcie;
> +	platform_set_drvdata(pdev, pcie);
>  
>  	pcie->soc = of_device_get_match_data(dev);
>  	INIT_LIST_HEAD(&pcie->ports);
> @@ -2388,6 +2395,25 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>  	return err;
>  }
>  
> +static int tegra_pcie_remove(struct platform_device *pdev)
> +{
> +	struct tegra_pcie *pcie = platform_get_drvdata(pdev);
> +	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
> +
> +	if (IS_ENABLED(CONFIG_DEBUG_FS))
> +		tegra_pcie_debugfs_exit(pcie);
> +	pci_stop_root_bus(host->bus);
> +	pci_remove_root_bus(host->bus);
> +	tegra_pcie_disable_ports(pcie);
> +	if (IS_ENABLED(CONFIG_PCI_MSI))
> +		tegra_pcie_disable_msi(pcie);
> +	tegra_pcie_free_resources(pcie);
> +	tegra_pcie_disable_controller(pcie);
> +	tegra_pcie_put_resources(pcie);

I prefer blank lines around conditional blocks for readability, so the
above would be:

	if (IS_ENABLED(CONFIG_DEBUG_FS))
		tegra_pcie_debugfs_exit(pcie);

	pci_stop_root_bus(host->bus);
	pci_remove_root_bus(host->bus);
	tegra_pcie_disable_ports(pcie);

	if (IS_ENABLED(CONFIG_PCI_MSI))
		tegra_pcie_disable_msi(pcie);

	tegra_pcie_free_resources(pcie);
	tegra_pcie_disable_controller(pcie);
	tegra_pcie_put_resources(pcie);

Not sure if Lorenzo or Bjorn have any specific preferences, though. My
Acked-by remains valid, though, since this is nitpicky.

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Re: [PATCH V7 2/4] PCI: tegra: Add loadable kernel module support

[Thierry Reding]

[-- Attachment #1: Type: text/plain, Size: 1115 bytes --]

On Tue, Jan 30, 2018 at 10:54:09AM +0530, Manikanta Maddireddy wrote:
> Implement remove callback function for Tegra PCIe driver to add
> loadable kernel module support. Change PCI_TEGRA config to tristate to
> allow pci-tegra driver to be build as a module.
> 
> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
> Acked-by: Thierry Reding <treding@nvidia.com>
> ---
> V2:
> * no change in this patch
> V3:
> * use tegra_pcie_debugfs_exit() helper function in tegra_pcie_debugfs_init()
> V4:
> * no change in this patch
> V5:
> * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
> rebased on linux-next
> V6:
> * no change in this patch
> V7:
> * no change in this patch
> 
>  drivers/pci/host/Kconfig     |  2 +-
>  drivers/pci/host/pci-tegra.c | 34 +++++++++++++++++++++++++++++++---
>  2 files changed, 32 insertions(+), 4 deletions(-)

Trying to build this as a module I get a link failure because
irq_set_msi_desc() is not exported. I thought a patch to do that had
been part of an earlier version of this series. Has that not been merged
yet?

Thierry

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Re: [PATCH V7 2/4] PCI: tegra: Add loadable kernel module support

[Manikanta Maddireddy]

On 13-Feb-18 6:37 PM, Thierry Reding wrote:
> On Tue, Jan 30, 2018 at 10:54:09AM +0530, Manikanta Maddireddy wrote:
>> Implement remove callback function for Tegra PCIe driver to add
>> loadable kernel module support. Change PCI_TEGRA config to tristate to
>> allow pci-tegra driver to be build as a module.
>>
>> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
>> Acked-by: Thierry Reding <treding@nvidia.com>
>> ---
>> V2:
>> * no change in this patch
>> V3:
>> * use tegra_pcie_debugfs_exit() helper function in tegra_pcie_debugfs_init()
>> V4:
>> * no change in this patch
>> V5:
>> * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
>> rebased on linux-next
>> V6:
>> * no change in this patch
>> V7:
>> * no change in this patch
>>
>>  drivers/pci/host/Kconfig     |  2 +-
>>  drivers/pci/host/pci-tegra.c | 34 +++++++++++++++++++++++++++++++---
>>  2 files changed, 32 insertions(+), 4 deletions(-)
> 
> Trying to build this as a module I get a link failure because
> irq_set_msi_desc() is not exported. I thought a patch to do that had
> been part of an earlier version of this series. Has that not been merged
> yet?
> 
> Thierry
> 
I got a review comment to use generic MSI model instead of deprecated API.
source: https://patchwork.ozlabs.org/patch/841111/

Also arm32 compilation will fail because of missing EXPORT of
tegra_cpuidle_pcie_irqs_in_use()
source: https://patchwork.ozlabs.org/patch/841119/

I need to put some time to prepare patches for these two cases.
Meanwhile I want to get the basic driver structure for LKM to be merged.
I verified locally with these two symbols exported.

Re: [PATCH V7 2/4] PCI: tegra: Add loadable kernel module support

[Thierry Reding]

[-- Attachment #1: Type: text/plain, Size: 2647 bytes --]

On Tue, Feb 13, 2018 at 06:48:49PM +0530, Manikanta Maddireddy wrote:
> 
> 
> On 13-Feb-18 6:37 PM, Thierry Reding wrote:
> > On Tue, Jan 30, 2018 at 10:54:09AM +0530, Manikanta Maddireddy wrote:
> >> Implement remove callback function for Tegra PCIe driver to add
> >> loadable kernel module support. Change PCI_TEGRA config to tristate to
> >> allow pci-tegra driver to be build as a module.
> >>
> >> Signed-off-by: Manikanta Maddireddy <mmaddireddy-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> >> Acked-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> >> ---
> >> V2:
> >> * no change in this patch
> >> V3:
> >> * use tegra_pcie_debugfs_exit() helper function in tegra_pcie_debugfs_init()
> >> V4:
> >> * no change in this patch
> >> V5:
> >> * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
> >> rebased on linux-next
> >> V6:
> >> * no change in this patch
> >> V7:
> >> * no change in this patch
> >>
> >>  drivers/pci/host/Kconfig     |  2 +-
> >>  drivers/pci/host/pci-tegra.c | 34 +++++++++++++++++++++++++++++++---
> >>  2 files changed, 32 insertions(+), 4 deletions(-)
> > 
> > Trying to build this as a module I get a link failure because
> > irq_set_msi_desc() is not exported. I thought a patch to do that had
> > been part of an earlier version of this series. Has that not been merged
> > yet?
> > 
> > Thierry
> > 
> I got a review comment to use generic MSI model instead of deprecated API.
> source: https://patchwork.ozlabs.org/patch/841111/
> 
> Also arm32 compilation will fail because of missing EXPORT of
> tegra_cpuidle_pcie_irqs_in_use()
> source: https://patchwork.ozlabs.org/patch/841119/
> 
> I need to put some time to prepare patches for these two cases.
> Meanwhile I want to get the basic driver structure for LKM to be merged.
> I verified locally with these two symbols exported.

Okay, that's fine. However, you can't request these patches to be merged
if they will break builds. There are people that run automated builders
that will check random configurations, which is bound to eventually get
us a bug report about how this fails to build.

Perhaps in order to get loadable module support merged without these
issues you could omit the Kconfig change making this a tristate symbol.
That way we can get all the structural changes ready and you can work
on the necessary exports or MSI model patches so that we can eventually
flip the symbol to tristate.

By the way, if you do respin for the tristate change, do you mind taking
a look at the blank line changes for readability I mentioned earlier?

Thierry

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Re: [PATCH V7 2/4] PCI: tegra: Add loadable kernel module support

[Manikanta Maddireddy]

On 13-Feb-18 7:21 PM, Thierry Reding wrote:
> On Tue, Feb 13, 2018 at 06:48:49PM +0530, Manikanta Maddireddy wrote:
>>
>>
>> On 13-Feb-18 6:37 PM, Thierry Reding wrote:
>>> On Tue, Jan 30, 2018 at 10:54:09AM +0530, Manikanta Maddireddy wrote:
>>>> Implement remove callback function for Tegra PCIe driver to add
>>>> loadable kernel module support. Change PCI_TEGRA config to tristate to
>>>> allow pci-tegra driver to be build as a module.
>>>>
>>>> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
>>>> Acked-by: Thierry Reding <treding@nvidia.com>
>>>> ---
>>>> V2:
>>>> * no change in this patch
>>>> V3:
>>>> * use tegra_pcie_debugfs_exit() helper function in tegra_pcie_debugfs_init()
>>>> V4:
>>>> * no change in this patch
>>>> V5:
>>>> * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
>>>> rebased on linux-next
>>>> V6:
>>>> * no change in this patch
>>>> V7:
>>>> * no change in this patch
>>>>
>>>>  drivers/pci/host/Kconfig     |  2 +-
>>>>  drivers/pci/host/pci-tegra.c | 34 +++++++++++++++++++++++++++++++---
>>>>  2 files changed, 32 insertions(+), 4 deletions(-)
>>>
>>> Trying to build this as a module I get a link failure because
>>> irq_set_msi_desc() is not exported. I thought a patch to do that had
>>> been part of an earlier version of this series. Has that not been merged
>>> yet?
>>>
>>> Thierry
>>>
>> I got a review comment to use generic MSI model instead of deprecated API.
>> source: https://patchwork.ozlabs.org/patch/841111/
>>
>> Also arm32 compilation will fail because of missing EXPORT of
>> tegra_cpuidle_pcie_irqs_in_use()
>> source: https://patchwork.ozlabs.org/patch/841119/
>>
>> I need to put some time to prepare patches for these two cases.
>> Meanwhile I want to get the basic driver structure for LKM to be merged.
>> I verified locally with these two symbols exported.
> 
> Okay, that's fine. However, you can't request these patches to be merged
> if they will break builds. There are people that run automated builders
> that will check random configurations, which is bound to eventually get
> us a bug report about how this fails to build.
> 
> Perhaps in order to get loadable module support merged without these
> issues you could omit the Kconfig change making this a tristate symbol.
> That way we can get all the structural changes ready and you can work
> on the necessary exports or MSI model patches so that we can eventually
> flip the symbol to tristate.
> 
> By the way, if you do respin for the tristate change, do you mind taking
> a look at the blank line changes for readability I mentioned earlier?
> 
> Thierry
> 

Taken care of both and published V8.

Manikanta

Re: [PATCH V7 2/4] PCI: tegra: Add loadable kernel module support

[Manikanta Maddireddy]

On 13-Feb-18 7:21 PM, Thierry Reding wrote:
> On Tue, Feb 13, 2018 at 06:48:49PM +0530, Manikanta Maddireddy wrote:
>>
>>
>> On 13-Feb-18 6:37 PM, Thierry Reding wrote:
>>> On Tue, Jan 30, 2018 at 10:54:09AM +0530, Manikanta Maddireddy wrote:
>>>> Implement remove callback function for Tegra PCIe driver to add
>>>> loadable kernel module support. Change PCI_TEGRA config to tristate to
>>>> allow pci-tegra driver to be build as a module.
>>>>
>>>> Signed-off-by: Manikanta Maddireddy <mmaddireddy-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>>> Acked-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>>> ---
>>>> V2:
>>>> * no change in this patch
>>>> V3:
>>>> * use tegra_pcie_debugfs_exit() helper function in tegra_pcie_debugfs_init()
>>>> V4:
>>>> * no change in this patch
>>>> V5:
>>>> * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
>>>> rebased on linux-next
>>>> V6:
>>>> * no change in this patch
>>>> V7:
>>>> * no change in this patch
>>>>
>>>>  drivers/pci/host/Kconfig     |  2 +-
>>>>  drivers/pci/host/pci-tegra.c | 34 +++++++++++++++++++++++++++++++---
>>>>  2 files changed, 32 insertions(+), 4 deletions(-)
>>>
>>> Trying to build this as a module I get a link failure because
>>> irq_set_msi_desc() is not exported. I thought a patch to do that had
>>> been part of an earlier version of this series. Has that not been merged
>>> yet?
>>>
>>> Thierry
>>>
>> I got a review comment to use generic MSI model instead of deprecated API.
>> source: https://patchwork.ozlabs.org/patch/841111/
>>
>> Also arm32 compilation will fail because of missing EXPORT of
>> tegra_cpuidle_pcie_irqs_in_use()
>> source: https://patchwork.ozlabs.org/patch/841119/
>>
>> I need to put some time to prepare patches for these two cases.
>> Meanwhile I want to get the basic driver structure for LKM to be merged.
>> I verified locally with these two symbols exported.
> 
> Okay, that's fine. However, you can't request these patches to be merged
> if they will break builds. There are people that run automated builders
> that will check random configurations, which is bound to eventually get
> us a bug report about how this fails to build.
> 
> Perhaps in order to get loadable module support merged without these
> issues you could omit the Kconfig change making this a tristate symbol.
> That way we can get all the structural changes ready and you can work
> on the necessary exports or MSI model patches so that we can eventually
> flip the symbol to tristate.
> 
> By the way, if you do respin for the tristate change, do you mind taking
> a look at the blank line changes for readability I mentioned earlier?
> 
> Thierry
> 

Hi Thierry,

Taken care of both and published V8. Since these are simple changes,
I retained your Ack & Tested signoff.

Manikanta

[PATCH V7 3/4] PCI: tegra: Broadcast PME_Turn_Off message before link goes to L2

[Manikanta Maddireddy]

Per PCIe r3.0, sec 5.3.3.2.1, PCIe root port shoould broadcast PME_Turn_Off
message before PCIe link goes to L2. PME_Turn_Off broadcast mechanism is
implemented in AFI module. Each Tegra PCIe root port has its own
PME_Turn_Off and PME_TO_Ack bitmap in AFI_PME register, program this
register to broadcast PME_Turn_Off message.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
---
V2:
* no change in this patch
V3:
* add PME bitmap in soc data instead of using compatible string
* replace while loop with readl_poll_timeout() for polling
* commit log correction
V4:
* no change in this patch
V5:
* Rebased on linux-next
V6:
* no change in this patch
V7:
* Per port soc data is added for pme bits
* list_for_each_entry_safe is changed to list_for_each_entry for pme turnoff

 drivers/pci/host/pci-tegra.c | 64 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 981f126b14d6..feb5b961f737 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -31,6 +31,7 @@
 #include <linux/delay.h>
 #include <linux/export.h>
 #include <linux/interrupt.h>
+#include <linux/iopoll.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
@@ -153,6 +154,8 @@
 #define  AFI_INTR_EN_FPCI_TIMEOUT	(1 << 7)
 #define  AFI_INTR_EN_PRSNT_SENSE	(1 << 8)
 
+#define AFI_PCIE_PME		0xf0
+
 #define AFI_PCIE_CONFIG					0x0f8
 #define  AFI_PCIE_CONFIG_PCIE_DISABLE(x)		(1 << ((x) + 1))
 #define  AFI_PCIE_CONFIG_PCIE_DISABLE_ALL		0xe
@@ -233,6 +236,8 @@
 #define PADS_REFCLK_CFG_PREDI_SHIFT		8  /* 11:8 */
 #define PADS_REFCLK_CFG_DRVI_SHIFT		12 /* 15:12 */
 
+#define PME_ACK_TIMEOUT 10000
+
 struct tegra_msi {
 	struct msi_controller chip;
 	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
@@ -244,8 +249,16 @@ struct tegra_msi {
 };
 
 /* used to differentiate between Tegra SoC generations */
+struct tegra_pcie_port_soc {
+	struct {
+		u8 turnoff_bit;
+		u8 ack_bit;
+	} pme;
+};
+
 struct tegra_pcie_soc {
 	unsigned int num_ports;
+	const struct tegra_pcie_port_soc *ports;
 	unsigned int msi_base_shift;
 	u32 pads_pll_ctl;
 	u32 tx_ref_sel;
@@ -1358,6 +1371,32 @@ static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
 	return 0;
 }
 
+static void tegra_pcie_pme_turnoff(struct tegra_pcie_port *port)
+{
+	struct tegra_pcie *pcie = port->pcie;
+	const struct tegra_pcie_soc *soc = pcie->soc;
+	int err;
+	u32 val;
+	u8 ack_bit;
+
+	val = afi_readl(pcie, AFI_PCIE_PME);
+	val |= (0x1 << soc->ports[port->index].pme.turnoff_bit);
+	afi_writel(pcie, val, AFI_PCIE_PME);
+
+	ack_bit = soc->ports[port->index].pme.ack_bit;
+	err = readl_poll_timeout(pcie->afi + AFI_PCIE_PME, val,
+				 val & (0x1 << ack_bit), 1, PME_ACK_TIMEOUT);
+	if (err)
+		dev_err(pcie->dev, "PME Ack is not received on port: %d\n",
+			port->index);
+
+	usleep_range(10000, 11000);
+
+	val = afi_readl(pcie, AFI_PCIE_PME);
+	val &= ~(0x1 << soc->ports[port->index].pme.turnoff_bit);
+	afi_writel(pcie, val, AFI_PCIE_PME);
+}
+
 static int tegra_msi_alloc(struct tegra_msi *chip)
 {
 	int msi;
@@ -2103,8 +2142,14 @@ static void tegra_pcie_disable_ports(struct tegra_pcie *pcie)
 	}
 }
 
+static const struct tegra_pcie_port_soc tegra20_pcie_ports[] = {
+	{ .pme.turnoff_bit = 0, .pme.ack_bit =  5 },
+	{ .pme.turnoff_bit = 8, .pme.ack_bit = 10 },
+};
+
 static const struct tegra_pcie_soc tegra20_pcie = {
 	.num_ports = 2,
+	.ports = tegra20_pcie_ports,
 	.msi_base_shift = 0,
 	.pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
 	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
@@ -2118,8 +2163,15 @@ static const struct tegra_pcie_soc tegra20_pcie = {
 	.program_uphy = true,
 };
 
+static const struct tegra_pcie_port_soc tegra30_pcie_ports[] = {
+	{ .pme.turnoff_bit =  0, .pme.ack_bit =  5 },
+	{ .pme.turnoff_bit =  8, .pme.ack_bit = 10 },
+	{ .pme.turnoff_bit = 16, .pme.ack_bit = 18 },
+};
+
 static const struct tegra_pcie_soc tegra30_pcie = {
 	.num_ports = 3,
+	.ports = tegra30_pcie_ports,
 	.msi_base_shift = 8,
 	.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
 	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
@@ -2136,6 +2188,7 @@ static const struct tegra_pcie_soc tegra30_pcie = {
 
 static const struct tegra_pcie_soc tegra124_pcie = {
 	.num_ports = 2,
+	.ports = tegra20_pcie_ports,
 	.msi_base_shift = 8,
 	.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
 	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
@@ -2151,6 +2204,7 @@ static const struct tegra_pcie_soc tegra124_pcie = {
 
 static const struct tegra_pcie_soc tegra210_pcie = {
 	.num_ports = 2,
+	.ports = tegra20_pcie_ports,
 	.msi_base_shift = 8,
 	.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
 	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
@@ -2164,8 +2218,15 @@ static const struct tegra_pcie_soc tegra210_pcie = {
 	.program_uphy = true,
 };
 
+static const struct tegra_pcie_port_soc tegra186_pcie_ports[] = {
+	{ .pme.turnoff_bit =  0, .pme.ack_bit =  5 },
+	{ .pme.turnoff_bit =  8, .pme.ack_bit = 10 },
+	{ .pme.turnoff_bit = 12, .pme.ack_bit = 14 },
+};
+
 static const struct tegra_pcie_soc tegra186_pcie = {
 	.num_ports = 3,
+	.ports = tegra186_pcie_ports,
 	.msi_base_shift = 8,
 	.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
 	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
@@ -2399,11 +2460,14 @@ static int tegra_pcie_remove(struct platform_device *pdev)
 {
 	struct tegra_pcie *pcie = platform_get_drvdata(pdev);
 	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+	struct tegra_pcie_port *port;
 
 	if (IS_ENABLED(CONFIG_DEBUG_FS))
 		tegra_pcie_debugfs_exit(pcie);
 	pci_stop_root_bus(host->bus);
 	pci_remove_root_bus(host->bus);
+	list_for_each_entry(port, &pcie->ports, list)
+		tegra_pcie_pme_turnoff(port);
 	tegra_pcie_disable_ports(pcie);
 	if (IS_ENABLED(CONFIG_PCI_MSI))
 		tegra_pcie_disable_msi(pcie);
-- 
2.1.4

Re: [PATCH V7 3/4] PCI: tegra: Broadcast PME_Turn_Off message before link goes to L2

[Thierry Reding]

[-- Attachment #1: Type: text/plain, Size: 1156 bytes --]

On Tue, Jan 30, 2018 at 10:54:10AM +0530, Manikanta Maddireddy wrote:
> Per PCIe r3.0, sec 5.3.3.2.1, PCIe root port shoould broadcast PME_Turn_Off
> message before PCIe link goes to L2. PME_Turn_Off broadcast mechanism is
> implemented in AFI module. Each Tegra PCIe root port has its own
> PME_Turn_Off and PME_TO_Ack bitmap in AFI_PME register, program this
> register to broadcast PME_Turn_Off message.
> 
> Signed-off-by: Manikanta Maddireddy <mmaddireddy-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
> V2:
> * no change in this patch
> V3:
> * add PME bitmap in soc data instead of using compatible string
> * replace while loop with readl_poll_timeout() for polling
> * commit log correction
> V4:
> * no change in this patch
> V5:
> * Rebased on linux-next
> V6:
> * no change in this patch
> V7:
> * Per port soc data is added for pme bits
> * list_for_each_entry_safe is changed to list_for_each_entry for pme turnoff
> 
>  drivers/pci/host/pci-tegra.c | 64 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 64 insertions(+)

Acked-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

[-- Attachment #2: signature.asc --]
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[PATCH V7 4/4] PCI: tegra: Add power management support

[Manikanta Maddireddy]

Tegra186 powergate driver is implemented as power domain driver, power
partition ungate/gate are registered as power_on/power_off callback
functions. There are no direct functions to power gate/ungate host
controller in Tegra186. Host controller driver should add "power-domains"
property in device tree and implement runtime suspend and resume
callback functons. Power gate and ungate is taken care by power domain
driver when host controller driver calls pm_runtime_put_sync and
pm_runtime_get_sync respectively.

Register suspend_noirq & resume_noirq callback functions to allow PCIe to
come up after resume from RAM. Both runtime and noirq pm ops share same
callback functions.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
---
V2:
* no change in this patch
V3:
* no change in this patch
V4:
* no change in this patch
V5:
* Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
rebased on linux-next
V6:
* no change in this patch
V7:
* memory & irq alloc and AFI programming for MSI are split in two functions

 drivers/pci/host/pci-tegra.c | 178 +++++++++++++++++++++++++++----------------
 1 file changed, 111 insertions(+), 67 deletions(-)

diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index feb5b961f737..21851bc08c7e 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -1293,31 +1293,25 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 		}
 	}
 
-	err = tegra_pcie_power_on(pcie);
-	if (err) {
-		dev_err(dev, "failed to power up: %d\n", err);
-		goto phys_put;
-	}
-
 	pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");
 	pcie->pads = devm_ioremap_resource(dev, pads);
 	if (IS_ERR(pcie->pads)) {
 		err = PTR_ERR(pcie->pads);
-		goto poweroff;
+		goto phys_put;
 	}
 
 	afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi");
 	pcie->afi = devm_ioremap_resource(dev, afi);
 	if (IS_ERR(pcie->afi)) {
 		err = PTR_ERR(pcie->afi);
-		goto poweroff;
+		goto phys_put;
 	}
 
 	/* request configuration space, but remap later, on demand */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
 	if (!res) {
 		err = -EADDRNOTAVAIL;
-		goto poweroff;
+		goto phys_put;
 	}
 
 	pcie->cs = *res;
@@ -1328,14 +1322,14 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 	pcie->cfg = devm_ioremap_resource(dev, &pcie->cs);
 	if (IS_ERR(pcie->cfg)) {
 		err = PTR_ERR(pcie->cfg);
-		goto poweroff;
+		goto phys_put;
 	}
 
 	/* request interrupt */
 	err = platform_get_irq_byname(pdev, "intr");
 	if (err < 0) {
 		dev_err(dev, "failed to get IRQ: %d\n", err);
-		goto poweroff;
+		goto phys_put;
 	}
 
 	pcie->irq = err;
@@ -1343,7 +1337,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 	err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);
 	if (err) {
 		dev_err(dev, "failed to register IRQ: %d\n", err);
-		goto poweroff;
+		goto phys_put;
 	}
 
 	return 0;
@@ -1351,8 +1345,6 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 phys_put:
 	if (soc->program_uphy)
 		tegra_pcie_phys_put(pcie);
-poweroff:
-	tegra_pcie_power_off(pcie);
 	return err;
 }
 
@@ -1363,8 +1355,6 @@ static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
 	if (pcie->irq > 0)
 		free_irq(pcie->irq, pcie);
 
-	tegra_pcie_power_off(pcie);
-
 	if (soc->program_uphy)
 		tegra_pcie_phys_put(pcie);
 
@@ -1533,15 +1523,13 @@ static const struct irq_domain_ops msi_domain_ops = {
 	.map = tegra_msi_map,
 };
 
-static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
+static int tegra_pcie_msi_setup(struct tegra_pcie *pcie)
 {
 	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
 	struct platform_device *pdev = to_platform_device(pcie->dev);
-	const struct tegra_pcie_soc *soc = pcie->soc;
 	struct tegra_msi *msi = &pcie->msi;
 	struct device *dev = pcie->dev;
 	int err;
-	u32 reg;
 
 	mutex_init(&msi->lock);
 
@@ -1574,6 +1562,20 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
 	/* setup AFI/FPCI range */
 	msi->pages = __get_free_pages(GFP_KERNEL, 0);
 	msi->phys = virt_to_phys((void *)msi->pages);
+	host->msi = &msi->chip;
+
+	return 0;
+
+err:
+	irq_domain_remove(msi->domain);
+	return err;
+}
+
+static void tegra_pcie_enable_msi(struct tegra_pcie *pcie)
+{
+	const struct tegra_pcie_soc *soc = pcie->soc;
+	struct tegra_msi *msi = &pcie->msi;
+	u32 reg;
 
 	afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
 	afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST);
@@ -1594,20 +1596,29 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
 	reg = afi_readl(pcie, AFI_INTR_MASK);
 	reg |= AFI_INTR_MASK_MSI_MASK;
 	afi_writel(pcie, reg, AFI_INTR_MASK);
+}
 
-	host->msi = &msi->chip;
+static void tegra_pcie_msi_teardown(struct tegra_pcie *pcie)
+{
+	struct tegra_msi *msi = &pcie->msi;
+	unsigned int i, irq;
 
-	return 0;
+	free_pages(msi->pages, 0);
+
+	if (msi->irq > 0)
+		free_irq(msi->irq, pcie);
+
+	for (i = 0; i < INT_PCI_MSI_NR; i++) {
+		irq = irq_find_mapping(msi->domain, i);
+		if (irq > 0)
+			irq_dispose_mapping(irq);
+	}
 
-err:
 	irq_domain_remove(msi->domain);
-	return err;
 }
 
 static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
 {
-	struct tegra_msi *msi = &pcie->msi;
-	unsigned int i, irq;
 	u32 value;
 
 	/* mask the MSI interrupt */
@@ -1625,19 +1636,6 @@ static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
 	afi_writel(pcie, 0, AFI_MSI_EN_VEC6);
 	afi_writel(pcie, 0, AFI_MSI_EN_VEC7);
 
-	free_pages(msi->pages, 0);
-
-	if (msi->irq > 0)
-		free_irq(msi->irq, pcie);
-
-	for (i = 0; i < INT_PCI_MSI_NR; i++) {
-		irq = irq_find_mapping(msi->domain, i);
-		if (irq > 0)
-			irq_dispose_mapping(irq);
-	}
-
-	irq_domain_remove(msi->domain);
-
 	return 0;
 }
 
@@ -2136,10 +2134,8 @@ static void tegra_pcie_disable_ports(struct tegra_pcie *pcie)
 {
 	struct tegra_pcie_port *port, *tmp;
 
-	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
 		tegra_pcie_port_disable(port);
-		tegra_pcie_port_free(port);
-	}
 }
 
 static const struct tegra_pcie_port_soc tegra20_pcie_ports[] = {
@@ -2394,26 +2390,22 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	err = tegra_pcie_enable_controller(pcie);
-	if (err)
+	err = tegra_pcie_msi_setup(pcie);
+	if (err < 0) {
+		dev_err(dev, "failed to enable MSI support: %d\n", err);
 		goto put_resources;
+	}
 
-	err = tegra_pcie_request_resources(pcie);
-	if (err)
-		goto disable_controller;
-
-	/* setup the AFI address translations */
-	tegra_pcie_setup_translations(pcie);
-
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		err = tegra_pcie_enable_msi(pcie);
-		if (err < 0) {
-			dev_err(dev, "failed to enable MSI support: %d\n", err);
-			goto free_resources;
-		}
+	pm_runtime_enable(pcie->dev);
+	err = pm_runtime_get_sync(pcie->dev);
+	if (err) {
+		dev_err(dev, "fail to enable pcie controller: %d\n", err);
+		goto teardown_msi;
 	}
 
-	tegra_pcie_enable_ports(pcie);
+	err = tegra_pcie_request_resources(pcie);
+	if (err)
+		goto pm_runtime_put;
 
 	host->busnr = pcie->busn.start;
 	host->dev.parent = &pdev->dev;
@@ -2424,7 +2416,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 	err = pci_scan_root_bus_bridge(host);
 	if (err < 0) {
 		dev_err(dev, "failed to register host: %d\n", err);
-		goto disable_ports;
+		goto free_resources;
 	}
 
 	pci_bus_size_bridges(host->bus);
@@ -2443,14 +2435,13 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 
 	return 0;
 
-disable_ports:
-	tegra_pcie_disable_ports(pcie);
-	if (IS_ENABLED(CONFIG_PCI_MSI))
-		tegra_pcie_disable_msi(pcie);
 free_resources:
 	tegra_pcie_free_resources(pcie);
-disable_controller:
-	tegra_pcie_disable_controller(pcie);
+pm_runtime_put:
+	pm_runtime_put_sync(pcie->dev);
+	pm_runtime_disable(pcie->dev);
+teardown_msi:
+	tegra_pcie_msi_teardown(pcie);
 put_resources:
 	tegra_pcie_put_resources(pcie);
 	return err;
@@ -2460,29 +2451,82 @@ static int tegra_pcie_remove(struct platform_device *pdev)
 {
 	struct tegra_pcie *pcie = platform_get_drvdata(pdev);
 	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
-	struct tegra_pcie_port *port;
+	struct tegra_pcie_port *port, *tmp;
 
 	if (IS_ENABLED(CONFIG_DEBUG_FS))
 		tegra_pcie_debugfs_exit(pcie);
 	pci_stop_root_bus(host->bus);
 	pci_remove_root_bus(host->bus);
+	tegra_pcie_free_resources(pcie);
+	pm_runtime_put_sync(pcie->dev);
+	pm_runtime_disable(pcie->dev);
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		tegra_pcie_msi_teardown(pcie);
+	tegra_pcie_put_resources(pcie);
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+		tegra_pcie_port_free(port);
+
+	return 0;
+}
+
+static int tegra_pcie_pm_suspend(struct device *dev)
+{
+	struct tegra_pcie *pcie = dev_get_drvdata(dev);
+	struct tegra_pcie_port *port;
+
 	list_for_each_entry(port, &pcie->ports, list)
 		tegra_pcie_pme_turnoff(port);
 	tegra_pcie_disable_ports(pcie);
 	if (IS_ENABLED(CONFIG_PCI_MSI))
 		tegra_pcie_disable_msi(pcie);
-	tegra_pcie_free_resources(pcie);
 	tegra_pcie_disable_controller(pcie);
-	tegra_pcie_put_resources(pcie);
+	tegra_pcie_power_off(pcie);
 
 	return 0;
 }
 
+static int tegra_pcie_pm_resume(struct device *dev)
+{
+	struct tegra_pcie *pcie = dev_get_drvdata(dev);
+	int err;
+
+	err = tegra_pcie_power_on(pcie);
+	if (err) {
+		dev_err(dev, "tegra pcie power on fail: %d\n", err);
+		return err;
+	}
+	err = tegra_pcie_enable_controller(pcie);
+	if (err) {
+		dev_err(dev, "tegra pcie controller enable fail: %d\n", err);
+		goto poweroff;
+	}
+	tegra_pcie_setup_translations(pcie);
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		tegra_pcie_enable_msi(pcie);
+
+	tegra_pcie_enable_ports(pcie);
+
+	return 0;
+
+poweroff:
+	tegra_pcie_power_off(pcie);
+
+	return err;
+}
+
+static const struct dev_pm_ops tegra_pcie_pm_ops = {
+	SET_RUNTIME_PM_OPS(tegra_pcie_pm_suspend, tegra_pcie_pm_resume, NULL)
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_pcie_pm_suspend,
+				      tegra_pcie_pm_resume)
+};
+
 static struct platform_driver tegra_pcie_driver = {
 	.driver = {
 		.name = "tegra-pcie",
 		.of_match_table = tegra_pcie_of_match,
 		.suppress_bind_attrs = true,
+		.pm = &tegra_pcie_pm_ops,
 	},
 	.probe = tegra_pcie_probe,
 	.remove = tegra_pcie_remove,
-- 
2.1.4

Re: [PATCH V7 4/4] PCI: tegra: Add power management support

[Thierry Reding]

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On Tue, Jan 30, 2018 at 10:54:11AM +0530, Manikanta Maddireddy wrote:
> Tegra186 powergate driver is implemented as power domain driver, power
> partition ungate/gate are registered as power_on/power_off callback
> functions. There are no direct functions to power gate/ungate host
> controller in Tegra186. Host controller driver should add "power-domains"
> property in device tree and implement runtime suspend and resume
> callback functons. Power gate and ungate is taken care by power domain
> driver when host controller driver calls pm_runtime_put_sync and
> pm_runtime_get_sync respectively.
> 
> Register suspend_noirq & resume_noirq callback functions to allow PCIe to
> come up after resume from RAM. Both runtime and noirq pm ops share same
> callback functions.
> 
> Signed-off-by: Manikanta Maddireddy <mmaddireddy-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
> V2:
> * no change in this patch
> V3:
> * no change in this patch
> V4:
> * no change in this patch
> V5:
> * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and
> rebased on linux-next
> V6:
> * no change in this patch
> V7:
> * memory & irq alloc and AFI programming for MSI are split in two functions
> 
>  drivers/pci/host/pci-tegra.c | 178 +++++++++++++++++++++++++++----------------
>  1 file changed, 111 insertions(+), 67 deletions(-)

Looks good to me:

Acked-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

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Re: [PATCH V7 0/4] Add loadable kernel module and power management support

[Thierry Reding]

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On Tue, Jan 30, 2018 at 10:54:07AM +0530, Manikanta Maddireddy wrote:
> This series of patches adds loadable kernel module and power management
> support to Tegra PCIe host controller driver. irq_set_msi_desc() and
> tegra_cpuidle_pcie_irqs_in_use() symbols will be taken care in next
> set of patches.
> 
> These patches are tested on Jetson TK1, TX1 and TX2 platforms, following
> are the verification details.
> 	- Multiple module insert & remove
> 	- PCIe device functionality after module insert
> 	- Free clock, resets, regulators, powergate, iomem and interrupt
> 	resources after module remove
> 	- PCIe device functionality after resume from RAM
> 
> V2: PM QoS fix is dropped in V2 from this series because the fix is
> incorporated in latest 'commit 0759e80b84e3 ("PM / QoS: Fix device resume
> latency framework")'. Update commit message of few patches in V2.
> 
> V3: Patches to export irq_set_msi_desc() and tegra_cpuidle_pcie_irqs_in_use()
> are dropped based on review comments. These symbols will be addressed in next
> series. Took care of few other review comments.
> 
> V4: Dropped pci_find_host_bridge() export patch and added new patch to use
> bus->sysdata for private data.
> 
> V5: Decouple from https://patchwork.ozlabs.org/patch/832053/ and rebase
> on top of linux-next
> 
> V6: Rebased on lpieralisi/pci/tegra branch
> 
> V7: Addressed comments on patch: 6 and 7 in V6
> Limiting this series to linux-tegra & linux-pci since patches for other 
> subsystem are merged or dropped
> 
> Manikanta Maddireddy (4):
>   PCI: tegra: Free resources on probe failure
>   PCI: tegra: Add loadable kernel module support
>   PCI: tegra: Broadcast PME_Turn_Off message before link goes to L2
>   PCI: tegra: Add power management support
> 
>  drivers/pci/host/Kconfig     |   2 +-
>  drivers/pci/host/pci-tegra.c | 347 +++++++++++++++++++++++++++++++++----------
>  2 files changed, 272 insertions(+), 77 deletions(-)

With the exception of the failure when building as a module that I
mentioned on patch 3/4, I've successfully tested this on Tegra20
(TrimSlice), Tegra30 (Beaver) and Tegra186 (Jetson TX2):

Tested-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

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