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Merge branch 'pci/host-designware' into next

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* pci/host-designware:
  PCI: designware: Use typical "for" loop idiom
  PCI: designware: Remove redundant call to pci_write_config_word()
  PCI: designware: Fix crash in dw_msi_teardown_irq()
This commit is contained in:
Bjorn Helgaas 2013-12-18 14:03:57 -07:00
commit c354e811a9
1 changed files with 40 additions and 19 deletions
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59
drivers/pci/host/pcie-designware.c
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@ -209,6 +209,23 @@ static int find_valid_pos0(struct pcie_port *pp, int msgvec, int pos, int *pos0)
return 0;
}
static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
unsigned int nvec, unsigned int pos)
{
unsigned int i, res, bit, val;
for (i = 0; i < nvec; i++) {
irq_set_msi_desc_off(irq_base, i, NULL);
clear_bit(pos + i, pp->msi_irq_in_use);
/* Disable corresponding interrupt on MSI interrupt controller */
res = ((pos + i) / 32) * 12;
bit = (pos + i) % 32;
dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
val &= ~(1 << bit);
dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
}
}
static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
{
int res, bit, irq, pos0, pos1, i;
@ -242,18 +259,25 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
if (!irq)
goto no_valid_irq;
i = 0;
while (i < no_irqs) {
/*
* irq_create_mapping (called from dw_pcie_host_init) pre-allocates
* descs so there is no need to allocate descs here. We can therefore
* assume that if irq_find_mapping above returns non-zero, then the
* descs are also successfully allocated.
*/
for (i = 0; i < no_irqs; i++) {
if (irq_set_msi_desc_off(irq, i, desc) != 0) {
clear_irq_range(pp, irq, i, pos0);
goto no_valid_irq;
}
set_bit(pos0 + i, pp->msi_irq_in_use);
irq_alloc_descs((irq + i), (irq + i), 1, 0);
irq_set_msi_desc(irq + i, desc);
/*Enable corresponding interrupt in MSI interrupt controller */
res = ((pos0 + i) / 32) * 12;
bit = (pos0 + i) % 32;
dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
val |= 1 << bit;
dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
i++;
}
*pos = pos0;
@ -266,7 +290,7 @@ no_valid_irq:
static void clear_irq(unsigned int irq)
{
int res, bit, val, pos;
unsigned int pos, nvec;
struct irq_desc *desc;
struct msi_desc *msi;
struct pcie_port *pp;
@ -281,18 +305,15 @@ static void clear_irq(unsigned int irq)
return;
}
/* undo what was done in assign_irq */
pos = data->hwirq;
nvec = 1 << msi->msi_attrib.multiple;
irq_free_desc(irq);
clear_irq_range(pp, irq, nvec, pos);
clear_bit(pos, pp->msi_irq_in_use);
/* Disable corresponding interrupt on MSI interrupt controller */
res = (pos / 32) * 12;
bit = pos % 32;
dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
val &= ~(1 << bit);
dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
/* all irqs cleared; reset attributes */
msi->irq = 0;
msi->msi_attrib.multiple = 0;
}
static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
@ -320,10 +341,10 @@ static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
if (irq < 0)
return irq;
msg_ctr &= ~PCI_MSI_FLAGS_QSIZE;
msg_ctr |= msgvec << 4;
pci_write_config_word(pdev, desc->msi_attrib.pos + PCI_MSI_FLAGS,
msg_ctr);
/*
* write_msi_msg() will update PCI_MSI_FLAGS so there is
* no need to explicitly call pci_write_config_word().
*/
desc->msi_attrib.multiple = msgvec;
msg.address_lo = virt_to_phys((void *)pp->msi_data);