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https://github.com/torvalds/linux
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powerpc: Convert the FSL MSI code to use msi_bitmap
This is 90% straight forward, although we have to change a few printk format strings as well because of the change in type of hwirq. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman
Paul Mackerras
parent
7e302869e0
commit
7e7ab36775
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@ -14,7 +14,6 @@
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*/
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#include <linux/irq.h>
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#include <linux/bootmem.h>
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#include <linux/bitmap.h>
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#include <linux/msi.h>
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#include <linux/pci.h>
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#include <linux/of_platform.h>
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@ -67,96 +66,22 @@ static struct irq_host_ops fsl_msi_host_ops = {
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.map = fsl_msi_host_map,
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};
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static irq_hw_number_t fsl_msi_alloc_hwirqs(struct fsl_msi *msi, int num)
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{
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unsigned long flags;
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int order = get_count_order(num);
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int offset;
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spin_lock_irqsave(&msi->bitmap_lock, flags);
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offset = bitmap_find_free_region(msi->fsl_msi_bitmap,
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NR_MSI_IRQS, order);
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spin_unlock_irqrestore(&msi->bitmap_lock, flags);
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pr_debug("%s: allocated 0x%x (2^%d) at offset 0x%x\n",
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__func__, num, order, offset);
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return offset;
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}
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static void fsl_msi_free_hwirqs(struct fsl_msi *msi, int offset, int num)
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{
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unsigned long flags;
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int order = get_count_order(num);
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pr_debug("%s: freeing 0x%x (2^%d) at offset 0x%x\n",
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__func__, num, order, offset);
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spin_lock_irqsave(&msi->bitmap_lock, flags);
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bitmap_release_region(msi->fsl_msi_bitmap, offset, order);
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spin_unlock_irqrestore(&msi->bitmap_lock, flags);
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}
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static int fsl_msi_free_dt_hwirqs(struct fsl_msi *msi)
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{
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int i;
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int len;
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const u32 *p;
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bitmap_allocate_region(msi->fsl_msi_bitmap, 0,
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get_count_order(NR_MSI_IRQS));
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p = of_get_property(msi->irqhost->of_node, "msi-available-ranges",
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&len);
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if (!p) {
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/* No msi-available-ranges property,
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* All the 256 MSI interrupts can be used
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*/
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fsl_msi_free_hwirqs(msi, 0, 0x100);
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return 0;
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}
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if ((len % (2 * sizeof(u32))) != 0) {
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printk(KERN_WARNING "fsl_msi: Malformed msi-available-ranges "
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"property on %s\n", msi->irqhost->of_node->full_name);
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return -EINVAL;
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}
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/* Format is: (<u32 start> <u32 count>)+ */
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len /= 2 * sizeof(u32);
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for (i = 0; i < len; i++, p += 2)
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fsl_msi_free_hwirqs(msi, *p, *(p + 1));
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return 0;
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}
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static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
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{
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int rc;
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int size = BITS_TO_LONGS(NR_MSI_IRQS) * sizeof(u32);
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msi_data->fsl_msi_bitmap = kzalloc(size, GFP_KERNEL);
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rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS,
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msi_data->irqhost->of_node);
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if (rc)
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return rc;
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if (msi_data->fsl_msi_bitmap == NULL) {
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pr_debug("%s: ENOMEM allocating allocator bitmap!\n",
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__func__);
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return -ENOMEM;
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rc = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap);
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if (rc < 0) {
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msi_bitmap_free(&msi_data->bitmap);
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return rc;
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}
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rc = fsl_msi_free_dt_hwirqs(msi_data);
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if (rc)
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goto out_free;
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return 0;
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out_free:
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kfree(msi_data->fsl_msi_bitmap);
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msi_data->fsl_msi_bitmap = NULL;
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return rc;
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}
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static int fsl_msi_check_device(struct pci_dev *pdev, int nvec, int type)
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@ -176,7 +101,8 @@ static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
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if (entry->irq == NO_IRQ)
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continue;
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set_irq_msi(entry->irq, NULL);
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fsl_msi_free_hwirqs(msi_data, virq_to_hw(entry->irq), 1);
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msi_bitmap_free_hwirqs(&msi_data->bitmap,
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virq_to_hw(entry->irq), 1);
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irq_dispose_mapping(entry->irq);
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}
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@ -198,15 +124,14 @@ static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
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static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
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{
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irq_hw_number_t hwirq;
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int rc;
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int rc, hwirq;
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unsigned int virq;
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struct msi_desc *entry;
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struct msi_msg msg;
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struct fsl_msi *msi_data = fsl_msi;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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hwirq = fsl_msi_alloc_hwirqs(msi_data, 1);
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hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
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if (hwirq < 0) {
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rc = hwirq;
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pr_debug("%s: fail allocating msi interrupt\n",
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@ -217,9 +142,9 @@ static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
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virq = irq_create_mapping(msi_data->irqhost, hwirq);
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if (virq == NO_IRQ) {
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pr_debug("%s: fail mapping hwirq 0x%lx\n",
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pr_debug("%s: fail mapping hwirq 0x%x\n",
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__func__, hwirq);
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fsl_msi_free_hwirqs(msi_data, hwirq, 1);
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msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
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rc = -ENOSPC;
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goto out_free;
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}
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@ -13,6 +13,8 @@
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#ifndef _POWERPC_SYSDEV_FSL_MSI_H
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#define _POWERPC_SYSDEV_FSL_MSI_H
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#include <asm/msi_bitmap.h>
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#define NR_MSI_REG 8
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#define IRQS_PER_MSI_REG 32
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#define NR_MSI_IRQS (NR_MSI_REG * IRQS_PER_MSI_REG)
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@ -31,8 +33,7 @@ struct fsl_msi {
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void __iomem *msi_regs;
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u32 feature;
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unsigned long *fsl_msi_bitmap;
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spinlock_t bitmap_lock;
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struct msi_bitmap bitmap;
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};
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#endif /* _POWERPC_SYSDEV_FSL_MSI_H */
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