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Revert "powerpc/fsl_msi: spread msi ints across different MSIRs"

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This reverts commit c822e73731.

This commit conflicted with a bitmap allocator change that partially
accomplishes the same thing, but which does so more correctly.  Revert
this one until it can be respun on top of the correct change.

Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Scott Wood 2014-09-19 15:20:36 -05:00
parent 6db35ad237
commit cb0446c1b6
4 changed files with 16 additions and 57 deletions
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2
arch/powerpc/include/asm/msi_bitmap.h
View File

@ -25,8 +25,6 @@ int msi_bitmap_alloc_hwirqs(struct msi_bitmap *bmp, int num);
void msi_bitmap_free_hwirqs(struct msi_bitmap *bmp, unsigned int offset,
unsigned int num);
void msi_bitmap_reserve_hwirq(struct msi_bitmap *bmp, unsigned int hwirq);
int msi_bitmap_alloc_hwirqs_from_offset(struct msi_bitmap *bmp, int offset,
int num);
int msi_bitmap_reserve_dt_hwirqs(struct msi_bitmap *bmp);

31
arch/powerpc/sysdev/fsl_msi.c
View File

@ -213,8 +213,6 @@ static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
* available interrupt.
*/
list_for_each_entry(msi_data, &msi_head, list) {
int off;
/*
* If the PCI node has an fsl,msi property, then we
* restrict our search to the corresponding MSI node.
@ -226,28 +224,7 @@ static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
if (phandle && (phandle != msi_data->phandle))
continue;
/*
* Allocate the msi message so that it fits on distinct
* MSIR registers. Obviously, since MSIR registers are
* limited they will overlap at one point.
*
* Due to the format of the newly introduced MSIIR1 in
* mpic 4.3, consecutive msi message values map to
* distinct MSIRs, thus distinct msi irq cascades, so
* nothing special needs to be done in this case.
* On older mpic versions the chose distinct SRS
* values by aligning the msi message value to the
* SRS field shift.
*/
if (msi_data->feature & FSL_PIC_FTR_MPIC_4_3) {
off = 0;
} else {
off = atomic_inc_return(&msi_data->msi_alloc_cnt) %
msi_data->msir_num;
off <<= msi_data->srs_shift;
}
hwirq = msi_bitmap_alloc_hwirqs_from_offset(
&msi_data->bitmap, off, 1);
hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
if (hwirq >= 0)
break;
}
@ -487,17 +464,12 @@ static int fsl_of_msi_probe(struct platform_device *dev)
goto error_out;
}
atomic_set(&msi->msi_alloc_cnt, -1);
p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);
if (of_device_is_compatible(dev->dev.of_node, "fsl,mpic-msi-v4.3") ||
of_device_is_compatible(dev->dev.of_node, "fsl,vmpic-msi-v4.3")) {
msi->srs_shift = MSIIR1_SRS_SHIFT;
msi->ibs_shift = MSIIR1_IBS_SHIFT;
msi->msir_num = NR_MSI_REG_MSIIR1;
msi->feature |= FSL_PIC_FTR_MPIC_4_3;
if (p)
dev_warn(&dev->dev, "%s: dose not support msi-available-ranges property\n",
__func__);
@ -515,7 +487,6 @@ static int fsl_of_msi_probe(struct platform_device *dev)
msi->srs_shift = MSIIR_SRS_SHIFT;
msi->ibs_shift = MSIIR_IBS_SHIFT;
msi->msir_num = NR_MSI_REG_MSIIR;
if (p && len % (2 * sizeof(u32)) != 0) {
dev_err(&dev->dev, "%s: Malformed msi-available-ranges property\n",

5
arch/powerpc/sysdev/fsl_msi.h
View File

@ -15,7 +15,6 @@
#include <linux/of.h>
#include <asm/msi_bitmap.h>
#include <asm/atomic.h>
#define NR_MSI_REG_MSIIR 8 /* MSIIR can index 8 MSI registers */
#define NR_MSI_REG_MSIIR1 16 /* MSIIR1 can index 16 MSI registers */
@ -28,8 +27,6 @@
#define FSL_PIC_IP_IPIC 0x00000002
#define FSL_PIC_IP_VMPIC 0x00000003
#define FSL_PIC_FTR_MPIC_4_3 0x00000010
struct fsl_msi_cascade_data;
struct fsl_msi {
@ -40,8 +37,6 @@ struct fsl_msi {
u32 msiir_offset; /* Offset of MSIIR, relative to start of CCSR */
u32 ibs_shift; /* Shift of interrupt bit select */
u32 srs_shift; /* Shift of the shared interrupt register select */
u32 msir_num; /* Number of available MSIR regs */
atomic_t msi_alloc_cnt; /* Counter for MSI hwirq allocations */
void __iomem *msi_regs;
u32 feature;
struct fsl_msi_cascade_data *cascade_array[NR_MSI_REG_MAX];

35
arch/powerpc/sysdev/msi_bitmap.c
View File

@ -14,28 +14,23 @@
#include <asm/msi_bitmap.h>
#include <asm/setup.h>
int msi_bitmap_alloc_hwirqs_from_offset(struct msi_bitmap *bmp, int offset,
int num)
{
unsigned long flags;
int index;
int order = get_count_order(num);
spin_lock_irqsave(&bmp->lock, flags);
index = bitmap_find_next_zero_area(bmp->bitmap, bmp->irq_count,
offset, num, (1 << order) - 1);
bitmap_set(bmp->bitmap, index, num);
spin_unlock_irqrestore(&bmp->lock, flags);
pr_debug("msi_bitmap: found %d free bits starting from offset %d at index %d\n",
num, offset, index);
return index;
}
int msi_bitmap_alloc_hwirqs(struct msi_bitmap *bmp, int num)
{
return msi_bitmap_alloc_hwirqs_from_offset(bmp, 0, num);
unsigned long flags;
int offset, order = get_count_order(num);
spin_lock_irqsave(&bmp->lock, flags);
/*
* This is fast, but stricter than we need. We might want to add
* a fallback routine which does a linear search with no alignment.
*/
offset = bitmap_find_free_region(bmp->bitmap, bmp->irq_count, order);
spin_unlock_irqrestore(&bmp->lock, flags);
pr_debug("msi_bitmap: allocated 0x%x (2^%d) at offset 0x%x\n",
num, order, offset);
return offset;
}
void msi_bitmap_free_hwirqs(struct msi_bitmap *bmp, unsigned int offset,