From b3bb6b858f2a60fe3ac0c3833084386f7dd420e4 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Wed, 12 Dec 2018 23:38:53 +0300 Subject: memory: tegra: Read client ID on GART page fault With the device tree binding changes, now Memory Controller has access to GART registers. Hence it is now possible to read client ID on GART page fault to get information about what memory client causes the fault. Signed-off-by: Dmitry Osipenko Acked-by: Thierry Reding Signed-off-by: Joerg Roedel --- drivers/memory/tegra/mc.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'drivers/memory/tegra') diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c index 59db13287b47..ce8cf81b55d7 100644 --- a/drivers/memory/tegra/mc.c +++ b/drivers/memory/tegra/mc.c @@ -38,6 +38,7 @@ #define MC_ERR_ADR 0x0c +#define MC_GART_ERROR_REQ 0x30 #define MC_DECERR_EMEM_OTHERS_STATUS 0x58 #define MC_SECURITY_VIOLATION_STATUS 0x74 @@ -575,8 +576,15 @@ static __maybe_unused irqreturn_t tegra20_mc_irq(int irq, void *data) break; case MC_INT_INVALID_GART_PAGE: - dev_err_ratelimited(mc->dev, "%s\n", error); - continue; + reg = MC_GART_ERROR_REQ; + value = mc_readl(mc, reg); + + id = (value >> 1) & mc->soc->client_id_mask; + desc = error_names[2]; + + if (value & BIT(0)) + direction = "write"; + break; case MC_INT_SECURITY_VIOLATION: reg = MC_SECURITY_VIOLATION_STATUS; -- cgit v1.2.3