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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-10-03 15:18:59 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-11-24 14:12:56 +1100
commit91ed6fd2c383bb8f02d66e98b4a4d2f7207249dc (patch)
tree3162b6a352f30e157dc10ce5fd0ad98775cc1608
parentf144d1496b47e7450f41b767d0d91c724c2198bc (diff)
downloadlinux-91ed6fd2c383bb8f02d66e98b4a4d2f7207249dc.tar.bz2
gpu/radeon: Set flag to indicate broken 64-bit MSI
Some radeon ASICs don't support all 64 address bits of MSIs despite advertising support for 64-bit MSIs in their configuration space. This breaks on systems such as IBM POWER7/8, where 64-bit MSIs can be assigned with some of the high address bits set. This makes use of the newly introduced "no_64bit_msi" flag in structure pci_dev to allow the MSI allocation code to fallback to 32-bit MSIs on those adapters. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> CC: <stable@vger.kernel.org> --- Adding Alex's review tag. Patch to the driver is identical to the reviewed one, I dropped the arch/powerpc hunk rewrote the subject and cset comment.
-rw-r--r--drivers/gpu/drm/radeon/radeon_irq_kms.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 7784911d78ef..00fc59762e0d 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -185,6 +185,16 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
if (rdev->flags & RADEON_IS_AGP)
return false;
+ /*
+ * Older chips have a HW limitation, they can only generate 40 bits
+ * of address for "64-bit" MSIs which breaks on some platforms, notably
+ * IBM POWER servers, so we limit them
+ */
+ if (rdev->family < CHIP_BONAIRE) {
+ dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
+ rdev->pdev->no_64bit_msi = 1;
+ }
+
/* force MSI on */
if (radeon_msi == 1)
return true;