drm/xe: get rid of MAX_BINDS

Mesa has been issuing a single bind operation per ioctl since xe.ko
changed to GPUVA due xe.ko bug #746. If I change Mesa to try again to
issue every single bind operation it can in the same ioctl, it hits
the MAX_BINDS assertion when running Vulkan conformance tests.

Test dEQP-VK.sparse_resources.transfer_queue.3d.rgba32i.1024_128_8
issues 960 bind operations in a single ioctl, it's the most I could
find in the conformance suite.

I don't see a reason to keep the MAX_BINDS restriction: it doesn't
seem to be preventing any specific issue. If the number is too big for
the memory allocations, then those will fail. Nothing related to
num_binds seems to be using the stack. Let's just get rid of it.

Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Testcase: dEQP-VK.sparse_resources.transfer_queue.3d.rgba32i.1024_128_8
References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/746
Cc: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240215005353.1295420-1-paulo.r.zanoni@intel.com
(cherry picked from commit ba6bbdc6eaef92998ec7f323c9e1211d344d2556)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 041b29439c4b5f8160553449569aa3179763aa84..75b44777067e2e2b020de3290ffaa66df5643308 100644 (file)
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2719,8 +2719,6 @@ static int vm_bind_ioctl_ops_execute(struct xe_vm *vm,
 #define XE_64K_PAGE_MASK 0xffffull
 #define ALL_DRM_XE_SYNCS_FLAGS (DRM_XE_SYNCS_FLAG_WAIT_FOR_OP)
 
-#define MAX_BINDS      512     /* FIXME: Picking random upper limit */
-
 static int vm_bind_ioctl_check_args(struct xe_device *xe,
                                    struct drm_xe_vm_bind *args,
                                    struct drm_xe_vm_bind_op **bind_ops)
@@ -2732,8 +2730,7 @@ static int vm_bind_ioctl_check_args(struct xe_device *xe,
            XE_IOCTL_DBG(xe, args->reserved[0] || args->reserved[1]))
                return -EINVAL;
 
-       if (XE_IOCTL_DBG(xe, args->extensions) ||
-           XE_IOCTL_DBG(xe, args->num_binds > MAX_BINDS))
+       if (XE_IOCTL_DBG(xe, args->extensions))
                return -EINVAL;
 
        if (args->num_binds > 1) {