On Fri, 17 Aug 2012, Ben Widawsky <ben at bwidawsk.net> wrote:
> INSTDONE is used in many places, and it varies from generation to
> generation. This provides a good reason for us to extract the logic to
> read the relevant information.
>
> The patch has no functional change. It's prep for some new stuff.
>
> v2: move the memset inside of i915_get_extra_instdone (Jani)
>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 50 +++++++++++++++++++++++++----------------
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> 2 files changed, 32 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 0c37101..46eb6e9 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1071,6 +1071,23 @@ i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
> return NULL;
> }
>
> +/* NB: please notice the memset */
> +static void i915_get_extra_instdone(struct drm_device *dev,
> + uint32_t instdone[I915_NUM_INSTDONE_REG])
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + memset(instdone, 0, sizeof(instdone));
This won't do what you want. sizeof(instdone) == sizeof(uint32_t *)
here. You either have to use I915_NUM_INSTDONE_REG or pass the size.
I don't know what that foo[SIZE] style really is good for in function
parameters. I guess it does have a documentation aspect, and some clever
compilers or static analyzers could flag out of bounds accesses. But it
also gives a kind of false sense of security, and makes one susceptible
to errors like this. So perhaps make that uint32_t *instdone while at
it?
BR,
Jani.
> +
> + if (INTEL_INFO(dev)->gen < 4) {
> + instdone[0] = I915_READ(INSTDONE);
> + instdone[1] = 0;
> + } else {
> + instdone[0] = I915_READ(INSTDONE_I965);
> + instdone[1] = I915_READ(INSTDONE1);
> + }
> +}
> +
> +
> static void i915_record_ring_state(struct drm_device *dev,
> struct drm_i915_error_state *error,
> struct intel_ring_buffer *ring)
> @@ -1286,6 +1303,7 @@ void i915_destroy_error_state(struct drm_device *dev)
> static void i915_report_and_clear_eir(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> + uint32_t instdone[I915_NUM_INSTDONE_REG];
> u32 eir = I915_READ(EIR);
> int pipe;
>
> @@ -1294,16 +1312,17 @@ static void i915_report_and_clear_eir(struct drm_device *dev)
>
> pr_err("render error detected, EIR: 0x%08x\n", eir);
>
> + i915_get_extra_instdone(dev, instdone);
> +
> if (IS_G4X(dev)) {
> if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
> u32 ipeir = I915_READ(IPEIR_I965);
>
> pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
> pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
> - pr_err(" INSTDONE: 0x%08x\n",
> - I915_READ(INSTDONE_I965));
> + pr_err(" INSTDONE: 0x%08x\n", instdone[0]);
> pr_err(" INSTPS: 0x%08x\n", I915_READ(INSTPS));
> - pr_err(" INSTDONE1: 0x%08x\n", I915_READ(INSTDONE1));
> + pr_err(" INSTDONE1: 0x%08x\n", instdone[1]);
> pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
> I915_WRITE(IPEIR_I965, ipeir);
> POSTING_READ(IPEIR_I965);
> @@ -1342,7 +1361,7 @@ static void i915_report_and_clear_eir(struct drm_device *dev)
>
> pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR));
> pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR));
> - pr_err(" INSTDONE: 0x%08x\n", I915_READ(INSTDONE));
> + pr_err(" INSTDONE: 0x%08x\n", instdone[0]);
> pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD));
> I915_WRITE(IPEIR, ipeir);
> POSTING_READ(IPEIR);
> @@ -1351,10 +1370,9 @@ static void i915_report_and_clear_eir(struct drm_device *dev)
>
> pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
> pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
> - pr_err(" INSTDONE: 0x%08x\n",
> - I915_READ(INSTDONE_I965));
> + pr_err(" INSTDONE: 0x%08x\n", instdone[0]);
> pr_err(" INSTPS: 0x%08x\n", I915_READ(INSTPS));
> - pr_err(" INSTDONE1: 0x%08x\n", I915_READ(INSTDONE1));
> + pr_err(" INSTDONE1: 0x%08x\n", instdone[1]);
> pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
> I915_WRITE(IPEIR_I965, ipeir);
> POSTING_READ(IPEIR_I965);
> @@ -1669,7 +1687,7 @@ void i915_hangcheck_elapsed(unsigned long data)
> {
> struct drm_device *dev = (struct drm_device *)data;
> drm_i915_private_t *dev_priv = dev->dev_private;
> - uint32_t acthd[I915_NUM_RINGS], instdone, instdone1;
> + uint32_t acthd[I915_NUM_RINGS], instdone[I915_NUM_INSTDONE_REG];
> struct intel_ring_buffer *ring;
> bool err = false, idle;
> int i;
> @@ -1697,25 +1715,19 @@ void i915_hangcheck_elapsed(unsigned long data)
> return;
> }
>
> - if (INTEL_INFO(dev)->gen < 4) {
> - instdone = I915_READ(INSTDONE);
> - instdone1 = 0;
> - } else {
> - instdone = I915_READ(INSTDONE_I965);
> - instdone1 = I915_READ(INSTDONE1);
> - }
> + i915_get_extra_instdone(dev, instdone);
>
> if (memcmp(dev_priv->last_acthd, acthd, sizeof(acthd)) == 0 &&
> - dev_priv->last_instdone == instdone &&
> - dev_priv->last_instdone1 == instdone1) {
> + dev_priv->last_instdone == instdone[0] &&
> + dev_priv->last_instdone1 == instdone[1]) {
> if (i915_hangcheck_hung(dev))
> return;
> } else {
> dev_priv->hangcheck_count = 0;
>
> memcpy(dev_priv->last_acthd, acthd, sizeof(acthd));
> - dev_priv->last_instdone = instdone;
> - dev_priv->last_instdone1 = instdone1;
> + dev_priv->last_instdone = instdone[0];
> + dev_priv->last_instdone1 = instdone[1];
> }
>
> repeat:
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 321ae72..7ebe6e5 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -478,6 +478,7 @@
> #define IPEIR_I965 0x02064
> #define IPEHR_I965 0x02068
> #define INSTDONE_I965 0x0206c
> +#define I915_NUM_INSTDONE_REG 2
> #define RING_IPEIR(base) ((base)+0x64)
> #define RING_IPEHR(base) ((base)+0x68)
> #define RING_INSTDONE(base) ((base)+0x6c)
> --
> 1.7.11.5
