Hi,
I am writing a custom module for Keystone 2 to handle a xilinx PCIe device and for this purpose i need to enable 4 MSI vectors. When i enable a single vector using pci_enable_msi(pdev) function the module works properly however when i try to enable multiple interrupts using the pci_enable_msi_block(pdev,32) the function returns 16 which means that it can allocate 16 interrupts however when i use pci_enable_msi_block(pdev,16) the function returns 1 instead of 0. I tried passing all possible values to this function to see what is the result which is as below:
for(i=2;i<33;i++)
{
ret = pci_enable_msi_block(pdev,i);
printk(KERN_DEBUG "For request i=%d the return value is=%d\n",i, ret);
}
[ 89.421184] For request i=2 the return value is=1
[ 89.421196] For request i=3 the return value is=1
[ 89.421208] For request i=4 the return value is=1
[ 89.421220] For request i=5 the return value is=1
[ 89.421232] For request i=6 the return value is=1
[ 89.421243] For request i=7 the return value is=1
[ 89.421255] For request i=8 the return value is=1
[ 89.421266] For request i=9 the return value is=1
[ 89.421278] For request i=10 the return value is=1
[ 89.421290] For request i=11 the return value is=1
[ 89.421301] For request i=12 the return value is=1
[ 89.421313] For request i=13 the return value is=1
[ 89.421325] For request i=14 the return value is=1
[ 89.421336] For request i=15 the return value is=1
[ 89.421348] For request i=16 the return value is=1
[ 89.421353] For request i=17 the return value is=16
[ 89.421359] For request i=18 the return value is=16
[ 89.421364] For request i=19 the return value is=16
[ 89.421369] For request i=20 the return value is=16
[ 89.421374] For request i=21 the return value is=16
[ 89.421380] For request i=22 the return value is=16
[ 89.421385] For request i=23 the return value is=16
[ 89.421390] For request i=24 the return value is=16
[ 89.421395] For request i=25 the return value is=16
[ 89.421401] For request i=26 the return value is=16
[ 89.421406] For request i=27 the return value is=16
[ 89.421411] For request i=28 the return value is=16
[ 89.421416] For request i=29 the return value is=16
[ 89.421422] For request i=30 the return value is=16
[ 89.421427] For request i=31 the return value is=16
[ 89.421432] For request i=32 the return value is=16
the function is successful (returns 0) only when pci_enable_msi_block(pdev,1) is used.
my intended use is as below:
ret = pci_enable_msi_block(pdev,4);
// request irq to assign interrupt handlers
I have also tried to use the pci_enable_msi_exact and pci_enable_msi_range functions however the code does not compile due to an implicit function declaration error.
So kindly provide solution to this issue so that i can allocate and use multiple vectors.
Regards,
Yaseen
