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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0055-drm-vmgfx-Replace-kmap_atomic.patch | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/debian/patches-rt/0055-drm-vmgfx-Replace-kmap_atomic.patch b/debian/patches-rt/0055-drm-vmgfx-Replace-kmap_atomic.patch new file mode 100644 index 000000000..613e94a91 --- /dev/null +++ b/debian/patches-rt/0055-drm-vmgfx-Replace-kmap_atomic.patch @@ -0,0 +1,104 @@ +From 3c21a2a16d681c2be78f257f660f1c8c1b50f7c3 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 3 Nov 2020 10:27:44 +0100 +Subject: [PATCH 055/323] drm/vmgfx: Replace kmap_atomic() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +There is no reason to disable pagefaults and preemption as a side effect of +kmap_atomic_prot(). + +Use kmap_local_page_prot() instead and document the reasoning for the +mapping usage with the given pgprot. + +Remove the NULL pointer check for the map. These functions return a valid +address for valid pages and the return was bogus anyway as it would have +left preemption and pagefaults disabled. + +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Cc: VMware Graphics <linux-graphics-maintainer@vmware.com> +Cc: Roland Scheidegger <sroland@vmware.com> +Cc: David Airlie <airlied@linux.ie> +Cc: Daniel Vetter <daniel@ffwll.ch> +Cc: dri-devel@lists.freedesktop.org +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + drivers/gpu/drm/vmwgfx/vmwgfx_blit.c | 30 +++++++++++----------------- + 1 file changed, 12 insertions(+), 18 deletions(-) + +diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c b/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c +index e8d66182cd7b..71dba228f68e 100644 +--- a/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c ++++ b/drivers/gpu/drm/vmwgfx/vmwgfx_blit.c +@@ -375,12 +375,12 @@ static int vmw_bo_cpu_blit_line(struct vmw_bo_blit_line_data *d, + copy_size = min_t(u32, copy_size, PAGE_SIZE - src_page_offset); + + if (unmap_src) { +- kunmap_atomic(d->src_addr); ++ kunmap_local(d->src_addr); + d->src_addr = NULL; + } + + if (unmap_dst) { +- kunmap_atomic(d->dst_addr); ++ kunmap_local(d->dst_addr); + d->dst_addr = NULL; + } + +@@ -388,12 +388,8 @@ static int vmw_bo_cpu_blit_line(struct vmw_bo_blit_line_data *d, + if (WARN_ON_ONCE(dst_page >= d->dst_num_pages)) + return -EINVAL; + +- d->dst_addr = +- kmap_atomic_prot(d->dst_pages[dst_page], +- d->dst_prot); +- if (!d->dst_addr) +- return -ENOMEM; +- ++ d->dst_addr = kmap_local_page_prot(d->dst_pages[dst_page], ++ d->dst_prot); + d->mapped_dst = dst_page; + } + +@@ -401,12 +397,8 @@ static int vmw_bo_cpu_blit_line(struct vmw_bo_blit_line_data *d, + if (WARN_ON_ONCE(src_page >= d->src_num_pages)) + return -EINVAL; + +- d->src_addr = +- kmap_atomic_prot(d->src_pages[src_page], +- d->src_prot); +- if (!d->src_addr) +- return -ENOMEM; +- ++ d->src_addr = kmap_local_page_prot(d->src_pages[src_page], ++ d->src_prot); + d->mapped_src = src_page; + } + diff->do_cpy(diff, d->dst_addr + dst_page_offset, +@@ -436,8 +428,10 @@ static int vmw_bo_cpu_blit_line(struct vmw_bo_blit_line_data *d, + * + * Performs a CPU blit from one buffer object to another avoiding a full + * bo vmap which may exhaust- or fragment vmalloc space. +- * On supported architectures (x86), we're using kmap_atomic which avoids +- * cross-processor TLB- and cache flushes and may, on non-HIGHMEM systems ++ * ++ * On supported architectures (x86), we're using kmap_local_prot() which ++ * avoids cross-processor TLB- and cache flushes. kmap_local_prot() will ++ * either map a highmem page with the proper pgprot on HIGHMEM=y systems or + * reference already set-up mappings. + * + * Neither of the buffer objects may be placed in PCI memory +@@ -500,9 +494,9 @@ int vmw_bo_cpu_blit(struct ttm_buffer_object *dst, + } + out: + if (d.src_addr) +- kunmap_atomic(d.src_addr); ++ kunmap_local(d.src_addr); + if (d.dst_addr) +- kunmap_atomic(d.dst_addr); ++ kunmap_local(d.dst_addr); + + return ret; + } +-- +2.43.0 + |