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-rw-r--r--drivers/pci/host/pci-mvebu.c5
-rw-r--r--drivers/pci/host/pci-tegra.c53
-rw-r--r--drivers/pci/pci-driver.c38
-rw-r--r--drivers/pci/pci.c8
-rw-r--r--drivers/pci/remove.c4
5 files changed, 84 insertions, 24 deletions
diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index c269e430c760..2aa7b77c7c88 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -447,6 +447,11 @@ static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
*value = 0;
break;
+ case PCI_INTERRUPT_LINE:
+ /* LINE PIN MIN_GNT MAX_LAT */
+ *value = 0;
+ break;
+
default:
*value = 0xffffffff;
return PCIBIOS_BAD_REGISTER_NUMBER;
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 0afbbbc55c81..0175041ab728 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -25,7 +25,6 @@
*/
#include <linux/clk.h>
-#include <linux/clk/tegra.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/interrupt.h>
@@ -39,6 +38,7 @@
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/reset.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/tegra-cpuidle.h>
@@ -259,10 +259,13 @@ struct tegra_pcie {
struct clk *pex_clk;
struct clk *afi_clk;
- struct clk *pcie_xclk;
struct clk *pll_e;
struct clk *cml_clk;
+ struct reset_control *pex_rst;
+ struct reset_control *afi_rst;
+ struct reset_control *pcie_xrst;
+
struct tegra_msi msi;
struct list_head ports;
@@ -858,7 +861,7 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
pads_writel(pcie, value, PADS_CTL);
/* take the PCIe interface module out of reset */
- tegra_periph_reset_deassert(pcie->pcie_xclk);
+ reset_control_deassert(pcie->pcie_xrst);
/* finally enable PCIe */
value = afi_readl(pcie, AFI_CONFIGURATION);
@@ -891,9 +894,9 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie)
/* TODO: disable and unprepare clocks? */
- tegra_periph_reset_assert(pcie->pcie_xclk);
- tegra_periph_reset_assert(pcie->afi_clk);
- tegra_periph_reset_assert(pcie->pex_clk);
+ reset_control_assert(pcie->pcie_xrst);
+ reset_control_assert(pcie->afi_rst);
+ reset_control_assert(pcie->pex_rst);
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
@@ -921,9 +924,9 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
const struct tegra_pcie_soc_data *soc = pcie->soc_data;
int err;
- tegra_periph_reset_assert(pcie->pcie_xclk);
- tegra_periph_reset_assert(pcie->afi_clk);
- tegra_periph_reset_assert(pcie->pex_clk);
+ reset_control_assert(pcie->pcie_xrst);
+ reset_control_assert(pcie->afi_rst);
+ reset_control_assert(pcie->pex_rst);
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
@@ -952,13 +955,14 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
}
err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
- pcie->pex_clk);
+ pcie->pex_clk,
+ pcie->pex_rst);
if (err) {
dev_err(pcie->dev, "powerup sequence failed: %d\n", err);
return err;
}
- tegra_periph_reset_deassert(pcie->afi_clk);
+ reset_control_deassert(pcie->afi_rst);
err = clk_prepare_enable(pcie->afi_clk);
if (err < 0) {
@@ -996,10 +1000,6 @@ static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
if (IS_ERR(pcie->afi_clk))
return PTR_ERR(pcie->afi_clk);
- pcie->pcie_xclk = devm_clk_get(pcie->dev, "pcie_xclk");
- if (IS_ERR(pcie->pcie_xclk))
- return PTR_ERR(pcie->pcie_xclk);
-
pcie->pll_e = devm_clk_get(pcie->dev, "pll_e");
if (IS_ERR(pcie->pll_e))
return PTR_ERR(pcie->pll_e);
@@ -1013,6 +1013,23 @@ static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
return 0;
}
+static int tegra_pcie_resets_get(struct tegra_pcie *pcie)
+{
+ pcie->pex_rst = devm_reset_control_get(pcie->dev, "pex");
+ if (IS_ERR(pcie->pex_rst))
+ return PTR_ERR(pcie->pex_rst);
+
+ pcie->afi_rst = devm_reset_control_get(pcie->dev, "afi");
+ if (IS_ERR(pcie->afi_rst))
+ return PTR_ERR(pcie->afi_rst);
+
+ pcie->pcie_xrst = devm_reset_control_get(pcie->dev, "pcie_x");
+ if (IS_ERR(pcie->pcie_xrst))
+ return PTR_ERR(pcie->pcie_xrst);
+
+ return 0;
+}
+
static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
{
struct platform_device *pdev = to_platform_device(pcie->dev);
@@ -1025,6 +1042,12 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
return err;
}
+ err = tegra_pcie_resets_get(pcie);
+ if (err) {
+ dev_err(&pdev->dev, "failed to get resets: %d\n", err);
+ return err;
+ }
+
err = tegra_pcie_power_on(pcie);
if (err) {
dev_err(&pdev->dev, "failed to power up: %d\n", err);
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 9042fdbd7244..25f0bc659164 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -19,6 +19,7 @@
#include <linux/cpu.h>
#include <linux/pm_runtime.h>
#include <linux/suspend.h>
+#include <linux/kexec.h>
#include "pci.h"
struct pci_dynid {
@@ -288,12 +289,27 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
int error, node;
struct drv_dev_and_id ddi = { drv, dev, id };
- /* Execute driver initialization on node where the device's
- bus is attached to. This way the driver likely allocates
- its local memory on the right node without any need to
- change it. */
+ /*
+ * Execute driver initialization on node where the device is
+ * attached. This way the driver likely allocates its local memory
+ * on the right node.
+ */
node = dev_to_node(&dev->dev);
- if (node >= 0) {
+
+ /*
+ * On NUMA systems, we are likely to call a PF probe function using
+ * work_on_cpu(). If that probe calls pci_enable_sriov() (which
+ * adds the VF devices via pci_bus_add_device()), we may re-enter
+ * this function to call the VF probe function. Calling
+ * work_on_cpu() again will cause a lockdep warning. Since VFs are
+ * always on the same node as the PF, we can work around this by
+ * avoiding work_on_cpu() when we're already on the correct node.
+ *
+ * Preemption is enabled, so it's theoretically unsafe to use
+ * numa_node_id(), but even if we run the probe function on the
+ * wrong node, it should be functionally correct.
+ */
+ if (node >= 0 && node != numa_node_id()) {
int cpu;
get_online_cpus();
@@ -305,6 +321,7 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
put_online_cpus();
} else
error = local_pci_probe(&ddi);
+
return error;
}
@@ -399,12 +416,17 @@ static void pci_device_shutdown(struct device *dev)
pci_msi_shutdown(pci_dev);
pci_msix_shutdown(pci_dev);
+#ifdef CONFIG_KEXEC
/*
- * Turn off Bus Master bit on the device to tell it to not
- * continue to do DMA. Don't touch devices in D3cold or unknown states.
+ * If this is a kexec reboot, turn off Bus Master bit on the
+ * device to tell it to not continue to do DMA. Don't touch
+ * devices in D3cold or unknown states.
+ * If it is not a kexec reboot, firmware will hit the PCI
+ * devices with big hammer and stop their DMA any way.
*/
- if (pci_dev->current_state <= PCI_D3hot)
+ if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
pci_clear_master(pci_dev);
+#endif
}
#ifdef CONFIG_PM
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 33120d156668..07369f32e8bb 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4165,6 +4165,14 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode,
return 0;
}
+bool pci_device_is_present(struct pci_dev *pdev)
+{
+ u32 v;
+
+ return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0);
+}
+EXPORT_SYMBOL_GPL(pci_device_is_present);
+
#define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
static DEFINE_SPINLOCK(resource_alignment_lock);
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 1576851028db..cc9337a71529 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -24,7 +24,7 @@ static void pci_stop_dev(struct pci_dev *dev)
if (dev->is_added) {
pci_proc_detach_device(dev);
pci_remove_sysfs_dev_files(dev);
- device_del(&dev->dev);
+ device_release_driver(&dev->dev);
dev->is_added = 0;
}
@@ -34,6 +34,8 @@ static void pci_stop_dev(struct pci_dev *dev)
static void pci_destroy_dev(struct pci_dev *dev)
{
+ device_del(&dev->dev);
+
down_write(&pci_bus_sem);
list_del(&dev->bus_list);
up_write(&pci_bus_sem);
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