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| author | Brian King <brking@linux.vnet.ibm.com> | 2024-01-17 15:46:32 -0600 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-03-03 22:18:45 +1100 |
| commit | b997bf240ebdfb36de5a138e94b77c3228507f07 (patch) | |
| tree | c6ff26a825df018f8602442b1132d2464cc92c81 /arch/powerpc/platforms | |
| parent | 9cbacb834b4afcb55eb8ac5115fa82fc7ede5c83 (diff) | |
| download | linux-stable-b997bf240ebdfb36de5a138e94b77c3228507f07.tar.gz linux-stable-b997bf240ebdfb36de5a138e94b77c3228507f07.tar.bz2 linux-stable-b997bf240ebdfb36de5a138e94b77c3228507f07.zip | |
powerpc: Enable support for 32 bit MSI-X vectors
Some devices are not capable of addressing 64 bits
via DMA, which includes MSI-X vectors. This allows
us to ensure these devices use MSI-X vectors in
32 bit space.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240117214632.134539-1-brking@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/pseries/msi.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c index 423ee1d5bd94..6dfb55b52d36 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -26,6 +26,7 @@ static int query_token, change_token; #define RTAS_CHANGE_MSI_FN 3 #define RTAS_CHANGE_MSIX_FN 4 #define RTAS_CHANGE_32MSI_FN 5 +#define RTAS_CHANGE_32MSIX_FN 6 /* RTAS Helpers */ @@ -41,7 +42,7 @@ static int rtas_change_msi(struct pci_dn *pdn, u32 func, u32 num_irqs) seq_num = 1; do { if (func == RTAS_CHANGE_MSI_FN || func == RTAS_CHANGE_MSIX_FN || - func == RTAS_CHANGE_32MSI_FN) + func == RTAS_CHANGE_32MSI_FN || func == RTAS_CHANGE_32MSIX_FN) rc = rtas_call(change_token, 6, 4, rtas_ret, addr, BUID_HI(buid), BUID_LO(buid), func, num_irqs, seq_num); @@ -406,8 +407,12 @@ again: if (use_32bit_msi_hack && rc > 0) rtas_hack_32bit_msi_gen2(pdev); - } else - rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec); + } else { + if (pdev->no_64bit_msi) + rc = rtas_change_msi(pdn, RTAS_CHANGE_32MSIX_FN, nvec); + else + rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec); + } if (rc != nvec) { if (nvec != nvec_in) { |