Merge tag 'pci-v5.4-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:
 "Enumeration:

   - Consolidate _HPP/_HPX stuff in pci-acpi.c and simplify it
     (Krzysztof Wilczynski)

   - Fix incorrect PCIe device types and remove dev->has_secondary_link
     to simplify code that deals with upstream/downstream ports (Mika
     Westerberg)

   - After suspend, restore Resizable BAR size bits correctly for 1MB
     BARs (Sumit Saxena)

   - Enable PCI_MSI_IRQ_DOMAIN support for RISC-V (Wesley Terpstra)

  Virtualization:

   - Add ACS quirks for iProc PAXB (Abhinav Ratna), Amazon Annapurna
     Labs (Ali Saidi)

   - Move sysfs SR-IOV functions to iov.c (Kelsey Skunberg)

   - Remove group write permissions from sysfs sriov_numvfs,
     sriov_drivers_autoprobe (Kelsey Skunberg)

  Hotplug:

   - Simplify pciehp indicator control (Denis Efremov)

  Peer-to-peer DMA:

   - Allow P2P DMA between root ports for whitelisted bridges (Logan
     Gunthorpe)

   - Whitelist some Intel host bridges for P2P DMA (Logan Gunthorpe)

   - DMA map P2P DMA requests that traverse host bridge (Logan
     Gunthorpe)

  Amazon Annapurna Labs host bridge driver:

   - Add DT binding and controller driver (Jonathan Chocron)

  Hyper-V host bridge driver:

   - Fix hv_pci_dev->pci_slot use-after-free (Dexuan Cui)

   - Fix PCI domain number collisions (Haiyang Zhang)

   - Use instance ID bytes 4 & 5 as PCI domain numbers (Haiyang Zhang)

   - Fix build errors on non-SYSFS config (Randy Dunlap)

  i.MX6 host bridge driver:

   - Limit DBI register length (Stefan Agner)

  Intel VMD host bridge driver:

   - Fix config addressing issues (Jon Derrick)

  Layerscape host bridge driver:

   - Add bar_fixed_64bit property to endpoint driver (Xiaowei Bao)

   - Add CONFIG_PCI_LAYERSCAPE_EP to build EP/RC drivers separately
     (Xiaowei Bao)

  Mediatek host bridge driver:

   - Add MT7629 controller support (Jianjun Wang)

  Mobiveil host bridge driver:

   - Fix CPU base address setup (Hou Zhiqiang)

   - Make "num-lanes" property optional (Hou Zhiqiang)

  Tegra host bridge driver:

   - Fix OF node reference leak (Nishka Dasgupta)

   - Disable MSI for root ports to work around design problem (Vidya
     Sagar)

   - Add Tegra194 DT binding and controller support (Vidya Sagar)

   - Add support for sideband pins and slot regulators (Vidya Sagar)

   - Add PIPE2UPHY support (Vidya Sagar)

  Misc:

   - Remove unused pci_block_cfg_access() et al (Kelsey Skunberg)

   - Unexport pci_bus_get(), etc (Kelsey Skunberg)

   - Hide PM, VC, link speed, ATS, ECRC, PTM constants and interfaces in
     the PCI core (Kelsey Skunberg)

   - Clean up sysfs DEVICE_ATTR() usage (Kelsey Skunberg)

   - Mark expected switch fall-through (Gustavo A. R. Silva)

   - Propagate errors for optional regulators and PHYs (Thierry Reding)

   - Fix kernel command line resource_alignment parameter issues (Logan
     Gunthorpe)"

* tag 'pci-v5.4-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (112 commits)
  PCI: Add pci_irq_vector() and other stubs when !CONFIG_PCI
  arm64: tegra: Add PCIe slot supply information in p2972-0000 platform
  arm64: tegra: Add configuration for PCIe C5 sideband signals
  PCI: tegra: Add support to enable slot regulators
  PCI: tegra: Add support to configure sideband pins
  PCI: vmd: Fix shadow offsets to reflect spec changes
  PCI: vmd: Fix config addressing when using bus offsets
  PCI: dwc: Add validation that PCIe core is set to correct mode
  PCI: dwc: al: Add Amazon Annapurna Labs PCIe controller driver
  dt-bindings: PCI: Add Amazon's Annapurna Labs PCIe host bridge binding
  PCI: Add quirk to disable MSI-X support for Amazon's Annapurna Labs Root Port
  PCI/VPD: Prevent VPD access for Amazon's Annapurna Labs Root Port
  PCI: Add ACS quirk for Amazon Annapurna Labs root ports
  PCI: Add Amazon's Annapurna Labs vendor ID
  MAINTAINERS: Add PCI native host/endpoint controllers designated reviewer
  PCI: hv: Use bytes 4 and 5 from instance ID as the PCI domain numbers
  dt-bindings: PCI: tegra: Add PCIe slot supplies regulator entries
  dt-bindings: PCI: tegra: Add sideband pins configuration entries
  PCI: tegra: Add Tegra194 PCIe support
  PCI: Get rid of dev->has_secondary_link flag
  ...

1 files changed, 53 insertions, 34 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1b27b5af3d55..e7982af9a5d8 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -890,8 +890,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
 
 	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
 	dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
-	if (dev->current_state != state && printk_ratelimit())
-		pci_info(dev, "Refused to change power state, currently in D%d\n",
+	if (dev->current_state != state)
+		pci_info_ratelimited(dev, "Refused to change power state, currently in D%d\n",
 			 dev->current_state);
 
 	/*
@@ -1443,7 +1443,7 @@ static void pci_restore_rebar_state(struct pci_dev *pdev)
 		pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
 		bar_idx = ctrl & PCI_REBAR_CTRL_BAR_IDX;
 		res = pdev->resource + bar_idx;
-		size = order_base_2((resource_size(res) >> 20) | 1) - 1;
+		size = ilog2(resource_size(res)) - 20;
 		ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE;
 		ctrl |= size << PCI_REBAR_CTRL_BAR_SHIFT;
 		pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl);
@@ -3581,7 +3581,7 @@ int pci_enable_atomic_ops_to_root(struct pci_dev *dev, u32 cap_mask)
 		}
 
 		/* Ensure upstream ports don't block AtomicOps on egress */
-		if (!bridge->has_secondary_link) {
+		if (pci_pcie_type(bridge) == PCI_EXP_TYPE_UPSTREAM) {
 			pcie_capability_read_dword(bridge, PCI_EXP_DEVCTL2,
 						   &ctl2);
 			if (ctl2 & PCI_EXP_DEVCTL2_ATOMIC_EGRESS_BLOCK)
@@ -5923,8 +5923,19 @@ resource_size_t __weak pcibios_default_alignment(void)
 	return 0;
 }
 
-#define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
-static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
+/*
+ * Arches that don't want to expose struct resource to userland as-is in
+ * sysfs and /proc can implement their own pci_resource_to_user().
+ */
+void __weak pci_resource_to_user(const struct pci_dev *dev, int bar,
+				 const struct resource *rsrc,
+				 resource_size_t *start, resource_size_t *end)
+{
+	*start = rsrc->start;
+	*end = rsrc->end;
+}
+
+static char *resource_alignment_param;
 static DEFINE_SPINLOCK(resource_alignment_lock);
 
 /**
@@ -5945,7 +5956,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev,
 
 	spin_lock(&resource_alignment_lock);
 	p = resource_alignment_param;
-	if (!*p && !align)
+	if (!p || !*p)
 		goto out;
 	if (pci_has_flag(PCI_PROBE_ONLY)) {
 		align = 0;
@@ -6109,35 +6120,41 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 	}
 }
 
-static ssize_t pci_set_resource_alignment_param(const char *buf, size_t count)
+static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
 {
-	if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1)
-		count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1;
-	spin_lock(&resource_alignment_lock);
-	strncpy(resource_alignment_param, buf, count);
-	resource_alignment_param[count] = '\0';
-	spin_unlock(&resource_alignment_lock);
-	return count;
-}
+	size_t count = 0;
 
-static ssize_t pci_get_resource_alignment_param(char *buf, size_t size)
-{
-	size_t count;
 	spin_lock(&resource_alignment_lock);
-	count = snprintf(buf, size, "%s", resource_alignment_param);
+	if (resource_alignment_param)
+		count = snprintf(buf, PAGE_SIZE, "%s", resource_alignment_param);
 	spin_unlock(&resource_alignment_lock);
-	return count;
-}
 
-static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
-{
-	return pci_get_resource_alignment_param(buf, PAGE_SIZE);
+	/*
+	 * When set by the command line, resource_alignment_param will not
+	 * have a trailing line feed, which is ugly. So conditionally add
+	 * it here.
+	 */
+	if (count >= 2 && buf[count - 2] != '\n' && count < PAGE_SIZE - 1) {
+		buf[count - 1] = '\n';
+		buf[count++] = 0;
+	}
+
+	return count;
 }
 
 static ssize_t resource_alignment_store(struct bus_type *bus,
 					const char *buf, size_t count)
 {
-	return pci_set_resource_alignment_param(buf, count);
+	char *param = kstrndup(buf, count, GFP_KERNEL);
+
+	if (!param)
+		return -ENOMEM;
+
+	spin_lock(&resource_alignment_lock);
+	kfree(resource_alignment_param);
+	resource_alignment_param = param;
+	spin_unlock(&resource_alignment_lock);
+	return count;
 }
 
 static BUS_ATTR_RW(resource_alignment);
@@ -6266,8 +6283,7 @@ static int __init pci_setup(char *str)
 			} else if (!strncmp(str, "cbmemsize=", 10)) {
 				pci_cardbus_mem_size = memparse(str + 10, &str);
 			} else if (!strncmp(str, "resource_alignment=", 19)) {
-				pci_set_resource_alignment_param(str + 19,
-							strlen(str + 19));
+				resource_alignment_param = str + 19;
 			} else if (!strncmp(str, "ecrc=", 5)) {
 				pcie_ecrc_get_policy(str + 5);
 			} else if (!strncmp(str, "hpiosize=", 9)) {
@@ -6302,15 +6318,18 @@ static int __init pci_setup(char *str)
 early_param("pci", pci_setup);
 
 /*
- * 'disable_acs_redir_param' is initialized in pci_setup(), above, to point
- * to data in the __initdata section which will be freed after the init
- * sequence is complete. We can't allocate memory in pci_setup() because some
- * architectures do not have any memory allocation service available during
- * an early_param() call. So we allocate memory and copy the variable here
- * before the init section is freed.
+ * 'resource_alignment_param' and 'disable_acs_redir_param' are initialized
+ * in pci_setup(), above, to point to data in the __initdata section which
+ * will be freed after the init sequence is complete. We can't allocate memory
+ * in pci_setup() because some architectures do not have any memory allocation
+ * service available during an early_param() call. So we allocate memory and
+ * copy the variable here before the init section is freed.
+ *
  */
 static int __init pci_realloc_setup_params(void)
 {
+	resource_alignment_param = kstrdup(resource_alignment_param,
+					   GFP_KERNEL);
 	disable_acs_redir_param = kstrdup(disable_acs_redir_param, GFP_KERNEL);
 
 	return 0;