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drm/radeon: add spinlocks for indirect register accesss

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This adds spinlocks to protect access to other
indirect register apertures.  These indirect spaces are
used pretty infrequently and we haven't had an reported
problems, but better safe than sorry.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2013-09-03 19:00:09 -04:00
parent fe78118c46
commit 0a5b7b0bd9
11 changed files with 155 additions and 1 deletions
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7
drivers/gpu/drm/radeon/cik.c
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@@ -122,20 +122,27 @@ int kv_get_temp(struct radeon_device *rdev)
*/
u32 cik_pciep_rreg(struct radeon_device *rdev, u32 reg)
{
unsigned long flags;
u32 r;
spin_lock_irqsave(&rdev->pciep_idx_lock, flags);
WREG32(PCIE_INDEX, reg);
(void)RREG32(PCIE_INDEX);
r = RREG32(PCIE_DATA);
spin_unlock_irqrestore(&rdev->pciep_idx_lock, flags);
return r;
}
void cik_pciep_wreg(struct radeon_device *rdev, u32 reg, u32 v)
{
unsigned long flags;
spin_lock_irqsave(&rdev->pciep_idx_lock, flags);
WREG32(PCIE_INDEX, reg);
(void)RREG32(PCIE_INDEX);
WREG32(PCIE_DATA, v);
(void)RREG32(PCIE_DATA);
spin_unlock_irqrestore(&rdev->pciep_idx_lock, flags);
}
static const u32 spectre_rlc_save_restore_register_list[] =