And greatly simplify the code by managing the vector number for the
subservices directly.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/pci/pcie/portdrv_core.c | 161 ++++++++++++----------------------------
1 file changed, 48 insertions(+), 113 deletions(-)
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 9698289..cea504f 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -44,52 +44,16 @@ static void release_pcie_device(struct device *dev)
}
/**
- * pcie_port_msix_add_entry - add entry to given array of MSI-X entries
- * @entries: Array of MSI-X entries
- * @new_entry: Index of the entry to add to the array
- * @nr_entries: Number of entries already in the array
- *
- * Return value: Position of the added entry in the array
- */
-static int pcie_port_msix_add_entry(
- struct msix_entry *entries, int new_entry, int nr_entries)
-{
- int j;
-
- for (j = 0; j < nr_entries; j++)
- if (entries[j].entry == new_entry)
- return j;
-
- entries[j].entry = new_entry;
- return j;
-}
-
-/**
* pcie_port_enable_msix - try to set up MSI-X as interrupt mode for given port
* @dev: PCI Express port to handle
- * @vectors: Array of interrupt vectors to populate
+ * @irqs: Array of interrupt vectors to populate
* @mask: Bitmask of port capabilities returned by get_port_device_capability()
*
* Return value: 0 on success, error code on failure
*/
-static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
+static int pcie_port_enable_msix(struct pci_dev *dev, int *irqs, int mask)
{
- struct msix_entry *msix_entries;
- int idx[PCIE_PORT_DEVICE_MAXSERVICES];
- int nr_entries, status, pos, i, nvec;
- u16 reg16;
- u32 reg32;
-
- nr_entries = pci_msix_vec_count(dev);
- if (nr_entries < 0)
- return nr_entries;
- BUG_ON(!nr_entries);
- if (nr_entries > PCIE_PORT_MAX_MSIX_ENTRIES)
- nr_entries = PCIE_PORT_MAX_MSIX_ENTRIES;
-
- msix_entries = kzalloc(sizeof(*msix_entries) * nr_entries, GFP_KERNEL);
- if (!msix_entries)
- return -ENOMEM;
+ int nr_entries, entry, nvec = 0;
/*
* Allocate as many entries as the port wants, so that we can check
@@ -97,20 +61,13 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
* equal to the number of entries this port actually uses, we'll happily
* go through without any tricks.
*/
- for (i = 0; i < nr_entries; i++)
- msix_entries[i].entry = i;
-
- status = pci_enable_msix_exact(dev, msix_entries, nr_entries);
- if (status)
- goto Exit;
-
- for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
- idx[i] = -1;
- status = -EIO;
- nvec = 0;
+ nr_entries = pci_alloc_irq_vectors(dev, 1, PCIE_PORT_MAX_MSIX_ENTRIES,
+ PCI_IRQ_MSIX);
+ if (nr_entries < 0)
+ return nr_entries;
if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) {
- int entry;
+ u16 reg16;
/*
* The code below follows the PCI Express Base Specification 2.0
@@ -125,18 +82,16 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
pcie_capability_read_word(dev, PCI_EXP_FLAGS, ®16);
entry = (reg16 & PCI_EXP_FLAGS_IRQ) >> 9;
if (entry >= nr_entries)
- goto Error;
+ goto out_free_irqs;
- i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
- if (i == nvec)
- nvec++;
+ irqs[PCIE_PORT_SERVICE_PME_SHIFT] = pci_irq_vector(dev, entry);
+ irqs[PCIE_PORT_SERVICE_HP_SHIFT] = pci_irq_vector(dev, entry);
- idx[PCIE_PORT_SERVICE_PME_SHIFT] = i;
- idx[PCIE_PORT_SERVICE_HP_SHIFT] = i;
+ nvec = max(nvec, entry + 1);
}
if (mask & PCIE_PORT_SERVICE_AER) {
- int entry;
+ u32 reg32, pos;
/*
* The code below follows Section 7.10.10 of the PCI Express
@@ -151,13 +106,11 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32);
entry = reg32 >> 27;
if (entry >= nr_entries)
- goto Error;
+ goto out_free_irqs;
- i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
- if (i == nvec)
- nvec++;
+ irqs[PCIE_PORT_SERVICE_AER_SHIFT] = pci_irq_vector(dev, entry);
- idx[PCIE_PORT_SERVICE_AER_SHIFT] = i;
+ nvec = max(nvec, entry + 1);
}
/*
@@ -165,41 +118,39 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
* what we have. Otherwise, the port has some extra entries not for the
* services we know and we need to work around that.
*/
- if (nvec == nr_entries) {
- status = 0;
- } else {
+ if (nvec != nr_entries) {
/* Drop the temporary MSI-X setup */
- pci_disable_msix(dev);
+ pci_free_irq_vectors(dev);
/* Now allocate the MSI-X vectors for real */
- status = pci_enable_msix_exact(dev, msix_entries, nvec);
- if (status)
- goto Exit;
+ nr_entries = pci_alloc_irq_vectors(dev, nvec, nvec,
+ PCI_IRQ_MSIX);
+ if (nr_entries < 0)
+ return nr_entries;
}
- for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
- vectors[i] = idx[i] >= 0 ? msix_entries[idx[i]].vector : -1;
-
- Exit:
- kfree(msix_entries);
- return status;
+ return 0;
- Error:
- pci_disable_msix(dev);
- goto Exit;
+out_free_irqs:
+ pci_free_irq_vectors(dev);
+ return -EIO;
}
/**
- * init_service_irqs - initialize irqs for PCI Express port services
+ * pcie_init_service_irqs - initialize irqs for PCI Express port services
* @dev: PCI Express port to handle
* @irqs: Array of irqs to populate
* @mask: Bitmask of port capabilities returned by get_port_device_capability()
*
* Return value: Interrupt mode associated with the port
*/
-static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
+static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
{
- int i, irq = -1;
+ unsigned flags = PCI_IRQ_LEGACY | PCI_IRQ_MSI;
+ int ret, i;
+
+ for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
+ irqs[i] = -1;
/*
* If MSI cannot be used for PCIe PME or hotplug, we have to use
@@ -207,41 +158,25 @@ static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
*/
if (((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi()) ||
((mask & PCIE_PORT_SERVICE_HP) && pciehp_no_msi())) {
- if (dev->irq)
- irq = dev->irq;
- goto no_msi;
+ flags &= ~PCI_IRQ_MSI;
+ } else {
+ /* Try to use MSI-X if supported */
+ if (!pcie_port_enable_msix(dev, irqs, mask))
+ return 0;
}
- /* Try to use MSI-X if supported */
- if (!pcie_port_enable_msix(dev, irqs, mask))
- return 0;
-
- /*
- * We're not going to use MSI-X, so try MSI and fall back to INTx.
- * If neither MSI/MSI-X nor INTx available, try other interrupt. On
- * some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode.
- */
- if (!pci_enable_msi(dev) || dev->irq)
- irq = dev->irq;
+ ret = pci_alloc_irq_vectors(dev, 1, 1, flags);
+ if (ret < 0)
+ return -ENODEV;
- no_msi:
- for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
- irqs[i] = irq;
- irqs[PCIE_PORT_SERVICE_VC_SHIFT] = -1;
+ for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
+ if (i != PCIE_PORT_SERVICE_VC_SHIFT)
+ irqs[i] = pci_irq_vector(dev, 0);
+ }
- if (irq < 0)
- return -ENODEV;
return 0;
}
-static void cleanup_service_irqs(struct pci_dev *dev)
-{
- if (dev->msix_enabled)
- pci_disable_msix(dev);
- else if (dev->msi_enabled)
- pci_disable_msi(dev);
-}
-
/**
* get_port_device_capability - discover capabilities of a PCI Express port
* @dev: PCI Express port to examine
@@ -378,7 +313,7 @@ int pcie_port_device_register(struct pci_dev *dev)
* that can be used in the absence of irqs. Allow them to determine
* if that is to be used.
*/
- status = init_service_irqs(dev, irqs, capabilities);
+ status = pcie_init_service_irqs(dev, irqs, capabilities);
if (status) {
capabilities &= PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_HP;
if (!capabilities)
@@ -401,7 +336,7 @@ int pcie_port_device_register(struct pci_dev *dev)
return 0;
error_cleanup_irqs:
- cleanup_service_irqs(dev);
+ pci_free_irq_vectors(dev);
error_disable:
pci_disable_device(dev);
return status;
@@ -469,7 +404,7 @@ static int remove_iter(struct device *dev, void *data)
void pcie_port_device_remove(struct pci_dev *dev)
{
device_for_each_child(&dev->dev, NULL, remove_iter);
- cleanup_service_irqs(dev);
+ pci_free_irq_vectors(dev);
pci_disable_device(dev);
}
--
2.1.4
