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intel-gpu-tools/range handling: register range handling

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Hooks to allow safe accesses from userspace. Can revert to old behavior
by using unsafe access.
This commit is contained in:
Ben Widawsky
2011-07-28 13:42:45 -07:00
parent cac8f8b526
commit abd7038e5a
4 changed files with 69 additions and 2 deletions
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lib/intel_mmio.c
+38 -1
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@@ -51,6 +51,7 @@ static struct _mmio_data {
char debugfs_path[FILENAME_MAX];
char debugfs_forcewake_path[FILENAME_MAX];
uint32_t i915_devid;
struct intel_register_map map;
int key;
} mmio_data;
@@ -151,7 +152,7 @@ release_forcewake_lock(int fd)
* @safe: use safe register access tables
*/
int
intel_register_access_init(struct pci_device *pci_dev)
intel_register_access_init(struct pci_device *pci_dev, int safe)
{
int ret;
@@ -164,6 +165,8 @@ intel_register_access_init(struct pci_device *pci_dev)
if (mmio_data.inited)
return -1;
mmio_data.safe = safe != 0 ? true : false;
/* Find where the forcewake lock is */
ret = find_debugfs_path("/sys/kernel/debug/dri");
if (ret) {
@@ -175,6 +178,8 @@ intel_register_access_init(struct pci_device *pci_dev)
}
mmio_data.i915_devid = pci_dev->device_id;
if (mmio_data.safe)
mmio_data.map = intel_get_register_map(mmio_data.i915_devid);
mmio_data.key = get_forcewake_lock();
mmio_data.inited++;
@@ -198,6 +203,25 @@ intel_register_read(uint32_t reg)
if (IS_GEN6(mmio_data.i915_devid))
assert(mmio_data.key != -1);
if (!mmio_data.safe)
goto read_out;
range = intel_get_register_range(mmio_data.map,
reg,
INTEL_RANGE_READ);
if(!range) {
fprintf(stderr, "Register read blocked for safety "
"(*0x%08x)\n", reg);
ret = 0xffffffff;
goto out;
}
read_out:
ret = *(volatile uint32_t *)((volatile char *)mmio + reg);
out:
return ret;
}
void
@@ -210,5 +234,18 @@ intel_register_write(uint32_t reg, uint32_t val)
if (IS_GEN6(mmio_data.i915_devid))
assert(mmio_data.key != -1);
if (!mmio_data.safe)
goto write_out;
range = intel_get_register_range(mmio_data.map,
reg,
INTEL_RANGE_WRITE);
if (!range) {
fprintf(stderr, "Register write blocked for safety "
"(*0x%08x = 0x%x)\n", reg, val);
}
write_out:
*(volatile uint32_t *)((volatile char *)mmio + reg) = val;
}