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authorEric Anholt <eric@anholt.net>2019-04-19 03:10:14 +0300
committerEric Anholt <eric@anholt.net>2019-05-16 19:24:52 +0300
commit38c2c7917adc8fb4ed9114b92923af9abe091af5 (patch)
tree7d1ef7f05ad02bb7f5c7eaef80f5573ef5f404ee /drivers/gpu/drm/v3d
parent1ba9d7cbc4530ae35eb1ebbd3c5e59d0c587aefa (diff)
downloadlinux-38c2c7917adc8fb4ed9114b92923af9abe091af5.tar.xz
drm/v3d: Fix and extend MMU error handling.
We were setting the wrong flags to enable PTI errors, so we were seeing reads to invalid PTEs show up as write errors. Also, we weren't turning on the interrupts. The AXI IDs we were dumping included the outstanding write number and so they looked basically random. And the VIO_ADDR decoding was based on the MMU VA_WIDTH for the first platform I worked on and was wrong on others. In short, this was a thorough mess from early HW enabling. Tested on V3D 4.1 and 4.2 with intentional L2T, CLE, PTB, and TLB faults. Signed-off-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20190419001014.23579-4-eric@anholt.net Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Diffstat (limited to 'drivers/gpu/drm/v3d')
-rw-r--r--drivers/gpu/drm/v3d/v3d_drv.c1
-rw-r--r--drivers/gpu/drm/v3d/v3d_drv.h2
-rw-r--r--drivers/gpu/drm/v3d/v3d_irq.c31
-rw-r--r--drivers/gpu/drm/v3d/v3d_mmu.c7
-rw-r--r--drivers/gpu/drm/v3d/v3d_regs.h3
5 files changed, 37 insertions, 7 deletions
diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index 747fb6205ba8..fea597f4db8a 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -261,6 +261,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO);
dev->coherent_dma_mask =
DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH));
+ v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH);
ident1 = V3D_READ(V3D_HUB_IDENT1);
v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 +
diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
index 47b86a25629e..9aad9da1eb11 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -57,6 +57,8 @@ struct v3d_dev {
*/
void *mmu_scratch;
dma_addr_t mmu_scratch_paddr;
+ /* virtual address bits from V3D to the MMU. */
+ int va_width;
/* Number of V3D cores. */
u32 cores;
diff --git a/drivers/gpu/drm/v3d/v3d_irq.c b/drivers/gpu/drm/v3d/v3d_irq.c
index fac3c542860b..268d8a889ac5 100644
--- a/drivers/gpu/drm/v3d/v3d_irq.c
+++ b/drivers/gpu/drm/v3d/v3d_irq.c
@@ -162,10 +162,33 @@ v3d_hub_irq(int irq, void *arg)
V3D_HUB_INT_MMU_PTI |
V3D_HUB_INT_MMU_CAP)) {
u32 axi_id = V3D_READ(V3D_MMU_VIO_ID);
- u64 vio_addr = (u64)V3D_READ(V3D_MMU_VIO_ADDR) << 8;
-
- dev_err(v3d->dev, "MMU error from client %d at 0x%08llx%s%s%s\n",
- axi_id, (long long)vio_addr,
+ u64 vio_addr = ((u64)V3D_READ(V3D_MMU_VIO_ADDR) <<
+ (v3d->va_width - 32));
+ static const char *const v3d41_axi_ids[] = {
+ "L2T",
+ "PTB",
+ "PSE",
+ "TLB",
+ "CLE",
+ "TFU",
+ "MMU",
+ "GMP",
+ };
+ const char *client = "?";
+
+ V3D_WRITE(V3D_MMU_CTL,
+ V3D_READ(V3D_MMU_CTL) & (V3D_MMU_CTL_CAP_EXCEEDED |
+ V3D_MMU_CTL_PT_INVALID |
+ V3D_MMU_CTL_WRITE_VIOLATION));
+
+ if (v3d->ver >= 41) {
+ axi_id = axi_id >> 5;
+ if (axi_id < ARRAY_SIZE(v3d41_axi_ids))
+ client = v3d41_axi_ids[axi_id];
+ }
+
+ dev_err(v3d->dev, "MMU error from client %s (%d) at 0x%llx%s%s%s\n",
+ client, axi_id, (long long)vio_addr,
((intsts & V3D_HUB_INT_MMU_WRV) ?
", write violation" : ""),
((intsts & V3D_HUB_INT_MMU_PTI) ?
diff --git a/drivers/gpu/drm/v3d/v3d_mmu.c b/drivers/gpu/drm/v3d/v3d_mmu.c
index 7a21f1787ab1..395e81d97163 100644
--- a/drivers/gpu/drm/v3d/v3d_mmu.c
+++ b/drivers/gpu/drm/v3d/v3d_mmu.c
@@ -69,10 +69,13 @@ int v3d_mmu_set_page_table(struct v3d_dev *v3d)
V3D_WRITE(V3D_MMU_PT_PA_BASE, v3d->pt_paddr >> V3D_MMU_PAGE_SHIFT);
V3D_WRITE(V3D_MMU_CTL,
V3D_MMU_CTL_ENABLE |
- V3D_MMU_CTL_PT_INVALID |
+ V3D_MMU_CTL_PT_INVALID_ENABLE |
V3D_MMU_CTL_PT_INVALID_ABORT |
+ V3D_MMU_CTL_PT_INVALID_INT |
V3D_MMU_CTL_WRITE_VIOLATION_ABORT |
- V3D_MMU_CTL_CAP_EXCEEDED_ABORT);
+ V3D_MMU_CTL_WRITE_VIOLATION_INT |
+ V3D_MMU_CTL_CAP_EXCEEDED_ABORT |
+ V3D_MMU_CTL_CAP_EXCEEDED_INT);
V3D_WRITE(V3D_MMU_ILLEGAL_ADDR,
(v3d->mmu_scratch_paddr >> V3D_MMU_PAGE_SHIFT) |
V3D_MMU_ILLEGAL_ADDR_ENABLE);
diff --git a/drivers/gpu/drm/v3d/v3d_regs.h b/drivers/gpu/drm/v3d/v3d_regs.h
index eda1e289976f..9bcb57781d31 100644
--- a/drivers/gpu/drm/v3d/v3d_regs.h
+++ b/drivers/gpu/drm/v3d/v3d_regs.h
@@ -152,7 +152,8 @@
# define V3D_MMU_CTL_PT_INVALID_ABORT BIT(19)
# define V3D_MMU_CTL_PT_INVALID_INT BIT(18)
# define V3D_MMU_CTL_PT_INVALID_EXCEPTION BIT(17)
-# define V3D_MMU_CTL_WRITE_VIOLATION BIT(16)
+# define V3D_MMU_CTL_PT_INVALID_ENABLE BIT(16)
+# define V3D_MMU_CTL_WRITE_VIOLATION BIT(12)
# define V3D_MMU_CTL_WRITE_VIOLATION_ABORT BIT(11)
# define V3D_MMU_CTL_WRITE_VIOLATION_INT BIT(10)
# define V3D_MMU_CTL_WRITE_VIOLATION_EXCEPTION BIT(9)