On 12/1/22 12:11, Maxime Ripard wrote:

Accessing a register when running under kunit is a bad idea since our device is completely mocked.

Fail the current test if we ever access any of our hardware registers.

Reviewed-by: Javier Martinez Canillas javierm@redhat.com Signed-off-by: Maxime Ripard maxime@cerno.tech

Reviewed-by: Maíra Canal mcanal@igalia.com

Just a small nit: I believe that macros with multiple statements should be enclosed in a do-while block [1], even READ macros. I saw that you enclosed the WRITE macros on a do-while block, but not the READ macros.

[1] https://www.kernel.org/doc/html/latest/process/coding-style.html#macros-enum...

Best Regards, - Maíra Canal

---

drivers/gpu/drm/vc4/vc4_crtc.c | 13 +++++++++++-- drivers/gpu/drm/vc4/vc4_dpi.c | 13 +++++++++++-- drivers/gpu/drm/vc4/vc4_drv.h | 29 +++++++++++++++++++++++++---- drivers/gpu/drm/vc4/vc4_dsi.c | 9 ++++++++- drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 4 ++++ drivers/gpu/drm/vc4/vc4_txp.c | 13 +++++++++++-- drivers/gpu/drm/vc4/vc4_vec.c | 13 +++++++++++-- 7 files changed, 81 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 7d1a696477ce..a1a3465948c4 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -50,8 +50,17 @@ #define HVS_FIFO_LATENCY_PIX 6 -#define CRTC_WRITE(offset, val) writel(val, vc4_crtc->regs + (offset)) -#define CRTC_READ(offset) readl(vc4_crtc->regs + (offset)) +#define CRTC_WRITE(offset, val) \

• do { \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• writel(val, vc4_crtc->regs + (offset));					\
  

• } while (0)

+#define CRTC_READ(offset) \

• ({ \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• readl(vc4_crtc->regs + (offset));					\
  

• })

static const struct debugfs_reg32 crtc_regs[] = { VC4_REG32(PV_CONTROL), diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c index 1f8f44b7b5a5..0edf3c4c98c8 100644 --- a/drivers/gpu/drm/vc4/vc4_dpi.c +++ b/drivers/gpu/drm/vc4/vc4_dpi.c @@ -103,8 +103,17 @@ to_vc4_dpi(struct drm_encoder *encoder) return container_of(encoder, struct vc4_dpi, encoder.base); } -#define DPI_READ(offset) readl(dpi->regs + (offset)) -#define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset)) +#define DPI_READ(offset) \

• ({ \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• readl(dpi->regs + (offset));						\
  

• })

+#define DPI_WRITE(offset, val) \

• do { \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• writel(val, dpi->regs + (offset));					\
  

• } while (0)

static const struct debugfs_reg32 dpi_regs[] = { VC4_REG32(DPI_C), diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h index 418f4f308e36..78fda5332cb3 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h @@ -19,6 +19,8 @@ #include <drm/drm_mm.h> #include <drm/drm_modeset_lock.h> +#include <kunit/test-bug.h>

• #include "uapi/drm/vc4_drm.h"

struct drm_device; @@ -645,10 +647,29 @@ to_vc4_crtc_state(const struct drm_crtc_state *crtc_state) return container_of(crtc_state, struct vc4_crtc_state, base); } -#define V3D_READ(offset) readl(vc4->v3d->regs + offset) -#define V3D_WRITE(offset, val) writel(val, vc4->v3d->regs + offset) -#define HVS_READ(offset) readl(hvs->regs + offset) -#define HVS_WRITE(offset, val) writel(val, hvs->regs + offset) +#define V3D_READ(offset) \

• ({ \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• readl(vc4->v3d->regs + (offset));						\
  

• })

+#define V3D_WRITE(offset, val) \

• do { \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• writel(val, vc4->v3d->regs + (offset));					\
  

• } while (0)

+#define HVS_READ(offset) \

• ({ \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• readl(hvs->regs + (offset));						\
  

• })

+#define HVS_WRITE(offset, val) \

• do { \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• writel(val, hvs->regs + (offset));					\
  

• } while (0)

#define VC4_REG32(reg) { .name = #reg, .offset = reg } diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c index 878e05d79e81..2c9cb27903a0 100644 --- a/drivers/gpu/drm/vc4/vc4_dsi.c +++ b/drivers/gpu/drm/vc4/vc4_dsi.c @@ -617,6 +617,8 @@ dsi_dma_workaround_write(struct vc4_dsi *dsi, u32 offset, u32 val) dma_cookie_t cookie; int ret;

• kunit_fail_current_test("Accessing a register in a unit test!\n");
• /* DSI0 should be able to write normally. */ if (!chan) { writel(val, dsi->regs + offset);

@@ -645,7 +647,12 @@ dsi_dma_workaround_write(struct vc4_dsi *dsi, u32 offset, u32 val) DRM_ERROR("Failed to wait for DMA: %d\n", ret); } -#define DSI_READ(offset) readl(dsi->regs + (offset)) +#define DSI_READ(offset) \

• ({ \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• readl(dsi->regs + (offset));						\
  

• })
• #define DSI_WRITE(offset, val) dsi_dma_workaround_write(dsi, offset, val) #define DSI_PORT_READ(offset) \ DSI_READ(dsi->variant->port ? DSI1_##offset : DSI0_##offset)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h index 48db438550b1..b04b2fc8d831 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h +++ b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h @@ -456,6 +456,8 @@ static inline u32 vc4_hdmi_read(struct vc4_hdmi *hdmi, WARN_ON(pm_runtime_status_suspended(&hdmi->pdev->dev));

• kunit_fail_current_test("Accessing an HDMI register in a unit test!\n");
• if (reg >= variant->num_registers) { dev_warn(&hdmi->pdev->dev, "Invalid register ID %u\n", reg);

@@ -486,6 +488,8 @@ static inline void vc4_hdmi_write(struct vc4_hdmi *hdmi, WARN_ON(pm_runtime_status_suspended(&hdmi->pdev->dev));

• kunit_fail_current_test("Accessing an HDMI register in a unit test!\n");
• if (reg >= variant->num_registers) { dev_warn(&hdmi->pdev->dev, "Invalid register ID %u\n", reg);

diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c index 2b69454b8534..ef5cab2a3aa9 100644 --- a/drivers/gpu/drm/vc4/vc4_txp.c +++ b/drivers/gpu/drm/vc4/vc4_txp.c @@ -145,8 +145,17 @@ /* Number of lines received and committed to memory. */ #define TXP_PROGRESS 0x10 -#define TXP_READ(offset) readl(txp->regs + (offset)) -#define TXP_WRITE(offset, val) writel(val, txp->regs + (offset)) +#define TXP_READ(offset) \

• ({ \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• readl(txp->regs + (offset));						\
  

• })

+#define TXP_WRITE(offset, val) \

• do { \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• writel(val, txp->regs + (offset));					\
  

• } while (0)

struct vc4_txp { struct vc4_crtc base; diff --git a/drivers/gpu/drm/vc4/vc4_vec.c b/drivers/gpu/drm/vc4/vc4_vec.c index e270a4099be3..f589ab918f4d 100644 --- a/drivers/gpu/drm/vc4/vc4_vec.c +++ b/drivers/gpu/drm/vc4/vc4_vec.c @@ -207,8 +207,17 @@ struct vc4_vec { struct debugfs_regset32 regset; }; -#define VEC_READ(offset) readl(vec->regs + (offset)) -#define VEC_WRITE(offset, val) writel(val, vec->regs + (offset)) +#define VEC_READ(offset) \

• ({ \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• readl(vec->regs + (offset));						\
  

• })

+#define VEC_WRITE(offset, val) \

• do { \

• kunit_fail_current_test("Accessing a register in a unit test!\n");	\
  

• writel(val, vec->regs + (offset));					\
  

• } while (0)

static inline struct vc4_vec * encoder_to_vc4_vec(struct drm_encoder *encoder)