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drm/i915: Add i915_param charp macro magic

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Handling the dynamic charp module parameter requires us to copy it for
the error state, or remember to lock it when reading (in case it used
with 0600).

v2: Use __always_inline and __builtin_strcmp

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170221162619.15954-1-chris@chris-wilson.co.uk
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2017-02-21 16:26:19 +00:00
parent 718e884a01
commit 1d6aa7a339
2 changed files with 24 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_debugfs.c
View file

@ -72,6 +72,8 @@ static __always_inline void seq_print_param(struct seq_file *m,
seq_printf(m, "i915.%s=%d\n", name, *(const int *)x);
else if (!__builtin_strcmp(type, "unsigned int"))
seq_printf(m, "i915.%s=%u\n", name, *(const unsigned int *)x);
else if (!__builtin_strcmp(type, "char *"))
seq_printf(m, "i915.%s=%s\n", name, *(const char **)x);
else
BUILD_BUG();
}

22
drivers/gpu/drm/i915/i915_gpu_error.c
View file

@ -557,6 +557,8 @@ static __always_inline void err_print_param(struct drm_i915_error_state_buf *m,
err_printf(m, "i915.%s=%d\n", name, *(const int *)x);
else if (!__builtin_strcmp(type, "unsigned int"))
err_printf(m, "i915.%s=%u\n", name, *(const unsigned int *)x);
else if (!__builtin_strcmp(type, "char *"))
err_printf(m, "i915.%s=%s\n", name, *(const char **)x);
else
BUILD_BUG();
}
@ -810,6 +812,12 @@ static void i915_error_object_free(struct drm_i915_error_object *obj)
kfree(obj);
}
static __always_inline void free_param(const char *type, void *x)
{
if (!__builtin_strcmp(type, "char *"))
kfree(*(void **)x);
}
void __i915_gpu_state_free(struct kref *error_ref)
{
struct i915_gpu_state *error =
@ -840,6 +848,11 @@ void __i915_gpu_state_free(struct kref *error_ref)
kfree(error->overlay);
kfree(error->display);
#define FREE(T, x) free_param(#T, &error->params.x);
I915_PARAMS_FOR_EACH(FREE);
#undef FREE
kfree(error);
}
@ -1614,6 +1627,12 @@ static void i915_capture_gen_state(struct drm_i915_private *dev_priv,
sizeof(error->device_info));
}
static __always_inline void dup_param(const char *type, void *x)
{
if (!__builtin_strcmp(type, "char *"))
*(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
}
static int capture(void *data)
{
struct i915_gpu_state *error = data;
@ -1625,6 +1644,9 @@ static int capture(void *data)
error->i915->gt.last_init_time));
error->params = i915;
#define DUP(T, x) dup_param(#T, &error->params.x);
I915_PARAMS_FOR_EACH(DUP);
#undef DUP
i915_capture_gen_state(error->i915, error);
i915_capture_reg_state(error->i915, error);